48 results on '"Galagan, J."'
Search Results
2. Initial sequencing and analysis of the human genome
- Author
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Lander, ES, Linton, LM, Birren, B, Nusbaum, C, Zody, MC, Baldwin, J, Devon, K, Dewar, K, Doyle, M, FitzHugh, W, Funke, R, Gage, D, Harris, K, Heaford, A, Howland, J, Kann, L, Lehoczky, J, LeVine, R, McEwan, P, McKernan, K, Meldrim, J, Mesirov, JP, Miranda, C, Morris, W, Naylor, J, Raymond, C, Rosetti, M, Santos, R, Sheridan, A, Sougnez, C, Stange-Thomann, N, Stojanovic, N, Subramanian, A, Wyman, D, Rogers, J, Sulston, J, Ainscough, R, Beck, S, Bentley, D, Burton, J, Clee, C, Carter, N, Coulson, A, Deadman, R, Deloukas, P, Dunham, A, Dunham, I, Durbin, R, French, L, Grafham, D, Gregory, S, Hubbard, T, Humphray, S, Hunt, A, Jones, M, Lloyd, C, McMurray, A, Matthews, L, Mercer, S, Milne, S, Mullikin, JC, Mungall, A, Plumb, R, Ross, M, Shownkeen, R, Sims, S, Waterston, RH, Wilson, RK, Hillier, LW, McPherson, JD, Marra, MA, Mardis, ER, Fulton, LA, Chinwalla, AT, Pepin, KH, Gish, WR, Chissoe, SL, Wendl, MC, Delehaunty, KD, Miner, TL, Delehaunty, A, Kramer, JB, Cook, LL, Fulton, RS, Johnson, DL, Minx, PJ, Clifton, SW, Hawkins, T, Branscomb, E, Predki, P, Richardson, P, Wenning, S, Slezak, T, Doggett, N, Cheng, JF, Olsen, A, Lucas, S, Elkin, C, Uberbacher, E, Frazier, M, Gibbs, RA, Muzny, DM, Scherer, SE, Bouck, JB, Sodergren, EJ, Worley, KC, Rives, CM, Gorrell, JH, Metzker, ML, Naylor, SL, Kucherlapati, RS, Nelson, DL, Weinstock, GM, Sakaki, Y, Fujiyama, A, Hattori, M, Yada, T, Toyoda, A, Itoh, T, Kawagoe, C, Watanabe, H, Totoki, Y, Taylor, T, Weissenbach, J, Heilig, R, Saurin, W, Artiguenave, F, Brottier, P, Bruls, T, Pelletier, E, Robert, C, Wincker, P, Smith, DR, Doucette-Stamm, L, Rubenfield, M, Weinstock, K, Lee, HM, Dubois, J, Rosenthal, A, Platzer, M, Nyakatura, G, Taudien, S, Rump, A, Yang, H, Yu, J, Wang, J, Huang, G, Gu, J, Hood, L, Rowen, L, Madan, A, Qin, S, Davis, RW, Federspiel, NA, Abola, AP, Proctor, MJ, Myers, RM, Schmutz, J, Dickson, M, Grimwood, J, Cox, DR, Olson, MV, Kaul, R, Shimizu, N, Kawasaki, K, Minoshima, S, Evans, GA, Athanasiou, M, Schultz, R, Roe, BA, Chen, F, Pan, H, Ramser, J, Lehrach, H, Reinhardt, R, McCombie, WR, de la Bastide, M, Dedhia, N, Blöcker, H, Hornischer, K, Nordsiek, G, Agarwala, R, Aravind, L, Bailey, JA, Bateman, A, Batzoglou, S, Birney, E, Bork, P, Brown, DG, Burge, CB, Cerutti, L, Chen, HC, Church, D, Clamp, M, Copley, RR, Doerks, T, Eddy, SR, Eichler, EE, Furey, TS, Galagan, J, Gilbert, JG, Harmon, C, Hayashizaki, Y, Haussler, D, Hermjakob, H, Hokamp, K, Jang, W, Johnson, LS, Jones, TA, Kasif, S, Kaspryzk, A, Kennedy, S, Kent, WJ, Kitts, P, Koonin, EV, Korf, I, Kulp, D, Lancet, D, Lowe, TM, McLysaght, A, Mikkelsen, T, Moran, JV, Mulder, N, Pollara, VJ, Ponting, CP, Schuler, G, Schultz, J, Slater, G, Smit, AF, Stupka, E, Szustakowski, J, Thierry-Mieg, D, Thierry-Mieg, J, Wagner, L, Wallis, J, Wheeler, R, Williams, A, Wolf, YI, Wolfe, KH, Yang, SP, Yeh, RF, Collins, F, Guyer, MS, Peterson, J, Felsenfeld, A, Wetterstrand, KA, Patrinos, A, Morgan, MJ, de Jong, P, Catanese, JJ, Osoegawa, K, Shizuya, H, Choi, S, Chen, YJ, and Szustakowki, J
- Subjects
Genetics ,Cancer genome sequencing ,Chimpanzee genome project ,Multidisciplinary ,Cancer Genome Project ,Gene density ,DNA sequencing theory ,Hybrid genome assembly ,Computational biology ,Biology ,Genome ,Personal genomics - Abstract
The human genome holds an extraordinary trove of information about human development, physiology, medicine and evolution. Here we report the results of an international collaboration to produce and make freely available a draft sequence of the human genome. We also present an initial analysis of the data, describing some of the insights that can be gleaned from the sequence.
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- 2016
3. Genetic Determinants of Drug Resistance in Mycobacterium tuberculosis and Their Diagnostic Value
- Author
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Farhat, M.R., Sultana, R., Iartchouk, O., Bozeman, S., Galagan, J., Sisk, P., Stolte, C., Nebenzahl-Guimaraes, H., Jacobson, K., Sloutsky, A., Kaur, D., Posey, J., Kreiswirth, B.N., Kurepina, N., Rigouts, L., Streicher, E.M., Victor, T.C., Warren, R.M., Soolingen, D. van, Murray, M., Farhat, M.R., Sultana, R., Iartchouk, O., Bozeman, S., Galagan, J., Sisk, P., Stolte, C., Nebenzahl-Guimaraes, H., Jacobson, K., Sloutsky, A., Kaur, D., Posey, J., Kreiswirth, B.N., Kurepina, N., Rigouts, L., Streicher, E.M., Victor, T.C., Warren, R.M., Soolingen, D. van, and Murray, M.
- Abstract
Item does not contain fulltext, RATIONALE: The development of molecular diagnostics that detect both the presence of Mycobacterium tuberculosis in clinical samples and drug resistance-conferring mutations promises to revolutionize patient care and interrupt transmission by ensuring early diagnosis. However, these tools require the identification of genetic determinants of resistance to the full range of antituberculosis drugs. OBJECTIVES: To determine the optimal molecular approach needed, we sought to create a comprehensive catalog of resistance mutations and assess their sensitivity and specificity in diagnosing drug resistance. METHODS: We developed and validated molecular inversion probes for DNA capture and deep sequencing of 28 drug-resistance loci in M. tuberculosis. We used the probes for targeted sequencing of a geographically diverse set of 1,397 clinical M. tuberculosis isolates with known drug resistance phenotypes. We identified a minimal set of mutations to predict resistance to first- and second-line antituberculosis drugs and validated our predictions in an independent dataset. We constructed and piloted a web-based database that provides public access to the sequence data and prediction tool. MEASUREMENTS AND MAIN RESULTS: The predicted resistance to rifampicin and isoniazid exceeded 90% sensitivity and specificity but was lower for other drugs. The number of mutations needed to diagnose resistance is large, and for the 13 drugs studied it was 238 across 18 genetic loci. CONCLUSIONS: These data suggest that a comprehensive M. tuberculosis drug resistance diagnostic will need to allow for a high dimension of mutation detection. They also support the hypothesis that currently unknown genetic determinants, potentially discoverable by whole-genome sequencing, encode resistance to second-line tuberculosis drugs.
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- 2016
4. Populational analysis reveals a link between complex viral escape from CD8+ T-Cell responses and protection in HCV infection
- Author
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Kuntzen, T., Neumann-Haefelin, Christoph, Lennon, N., Talal, A. H., Carlson, J., Brumme, C., Timm, Jörg, Schmidt, J., Wunsch, K., Berical, A., Berlin, A. M., Adams, S., Young, S. K., Reyor, L. L., Kleyman, M., McMahon, C. M., Birch, C., Schulze zur Wiesch, J., Ledlie, T., Michael, K., Kodira, C., Roberts, A. D., Schneidewind, A., Lauer, G. M., Kim, A. Y., Rosen, H. R., Bihl, F., Cerny, A., Spengler, U., Brander, C., Galagan, J. E., Nusbaum, C., Walker, B. D., Lake-Bakaar, G. V., Daar, E. S., Jacobson, I. M., Gomperts, E. D., Edlin, B. R., Donfield, S. M., Chung, R. T., Marion, T., Birren, B. W., Marincola, F., Thimme, R., Carrington, M., Heckerman, D., Henn, M. R., and Allen, T. M.
- Subjects
Medizin - Published
- 2011
5. Role of intragenic binding of cAMP responsive protein (CRP) in regulation of the succinate dehydrogenase genes Rv0249c-Rv0247c in TB complex mycobacteria
- Author
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Knapp, G. S., primary, Lyubetskaya, A., additional, Peterson, M. W., additional, Gomes, A. L. C., additional, Ma, Z., additional, Galagan, J. E., additional, and McDonough, K. A., additional
- Published
- 2015
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6. Comparative Genomics Yields Insights into Niche Adaptation of Plant Vascular Wilt Pathogens
- Author
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Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.P.H.J., Chen, Z.J., Henrissat, B., Lee, Y.H., Park, J., Garcia-Pedrajas, M.D., Barbara, D.J., Anchieta, A., de Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z., Amyotte, S.G., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L.J., Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.P.H.J., Chen, Z.J., Henrissat, B., Lee, Y.H., Park, J., Garcia-Pedrajas, M.D., Barbara, D.J., Anchieta, A., de Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z., Amyotte, S.G., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., and Ma, L.J.
- Abstract
The vascular wilt fungi Verticillium dahliae and V. albo-atrum infect over 200 plant species, causing billions of dollars in annual crop losses. The characteristic wilt symptoms are a result of colonization and proliferation of the pathogens in the xylem vessels, which undergo fluctuations in osmolarity. To gain insights into the mechanisms that confer the organisms' pathogenicity and enable them to proliferate in the unique ecological niche of the plant vascular system, we sequenced the genomes of V. dahliae and V. albo-atrum and compared them to each other, and to the genome of Fusarium oxysporum, another fungal wilt pathogen. Our analyses identified a set of proteins that are shared among all three wilt pathogens, and present in few other fungal species. One of these is a homolog of a bacterial glucosyltransferase that synthesizes virulence-related osmoregulated periplasmic glucans in bacteria. Pathogenicity tests of the corresponding V. dahliae glucosyltransferase gene deletion mutants indicate that the gene is required for full virulence in the Australian tobacco species Nicotiana benthamiana. Compared to other fungi, the two sequenced Verticillium genomes encode more pectin-degrading enzymes and other carbohydrate-active enzymes, suggesting an extraordinary capacity to degrade plant pectin barricades. The high level of synteny between the two Verticillium assemblies highlighted four flexible genomic islands in V. dahliae that are enriched for transposable elements, and contain duplicated genes and genes that are important in signaling/transcriptional regulation and iron/lipid metabolism. Coupled with an enhanced capacity to degrade plant materials, these genomic islands may contribute to the expanded genetic diversity and virulence of V. dahliae, the primary causal agent of Verticillium wilts. Significantly, our study reveals insights into the genetic mechanisms of niche adaptation of fungal wilt pathogens, advances our understanding of the evolution and devel
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- 2011
7. Initial sequencing and analysis of the human genome
- Author
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Univ Michigan, Sch Med, Dept Human Genet, Ann Arbor, MI 48109 USA, Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI 48109 USA, Whitehead Inst Biomed Res, Ctr Genome Res, Cambridge, MA 02142 USA, Sanger Ctr, Hinxton CB10 1RQ, Cambs, England, Washington Univ, Genome Sequencing Ctr, St Louis, MO 63108 USA, US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA, Baylor Coll Med, Human Genome Sequencing Ctr, Dept Mol & Human Genet, Houston, TX 77030 USA, Univ Texas, Hlth Sci Ctr, Dept Cellular & Struct Biol, San Antonio, TX 78229 USA, Yeshiva Univ Albert Einstein Coll Med, Dept Mol Genet, Bronx, NY 10461 USA, Univ Texas, Sch Med, Dept Microbiol & Mol Genet, Houston, TX 77225 USA, RIKEN, Genom Sci Ctr, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan, Genoscope, F-91057 Evry, France, CNRS, UMR 8030, F-91057 Evry, France, Genome Therapeut Corp, GTC Sequencing Ctr, Waltham, MA 02453 USA, Inst Mol Biotechnol, Dept Genome Anal, D-07745 Jena, Germany, Chinese Acad Sci, Inst Genet, Ctr Human Genome, Beijing Genom Inst, Beijing 100101, Peoples R China, So China Natl Human Genome Res Ctr, Shanghai 201203, Peoples R China, No China Natl Human Genome Res Ctr, Beijing 100176, Peoples R China, Inst Syst Biol, Multimegabase Sequencing Ctr, Seattle, WA 98105 USA, Stanford Genome Technol Ctr, Palo Alto, CA 94304 USA, Stanford Univ, Dept Genet, Sch Med, Stanford, CA 94305 USA, Stanford Univ, Stanford Human Genome Ctrr, Sch Med, Stanford, CA 94305 USA, Univ Washington, Genome Ctr, Seattle, WA 98195 USA, Keio Univ, Sch Med, Dept Biol Mol, Shinjuku Ku, Tokyo 1608582, Japan, Univ Texas, SW Med Ctr, Dallas, TX 75235 USA, Univ Oklahoma, Adv Ctr Genome Technol, Dept Chem & Biochem, Norman, OK 73019 USA, Max Planck Inst Mol Genet, D-14195 Berlin, Germany, Cold Spring Harbor Lab, Lita Annenberg Hazen Genome Ctr, Cold Spring Harbor, NY 11724 USA, GBF, German Res Ctr Biotechnol, D-38124 Braunschweig, Germany, NIH, Natl Ctr Biotechnol Informat, Natl Lib Med, Bethesda, MD 20894 USA, Case Western Reserve Univ, Sch Med, Dept Genet, Cleveland, OH 44106 USA, Univ Hosp Cleveland, Cleveland, OH 44106 USA, EMBL, European Bioinformat Inst, Cambridge CB10 1SD, England, Max Delbruck Ctr Mol Med, D-13125 Berlin, Germany, MIT, Dept Biol, Cambridge, MA 02139 USA, Washington Univ, Sch Med, Dept Genet, St Louis, MO 63110 USA, Univ Calif Santa Cruz, Dept Comp Sci, Santa Cruz, CA 95064 USA, Affymetrix Inc, Berkeley, CA 94710 USA, RIKEN, Yokoham Inst, Genom Sci Ctr, Genom Explorat Res Grp, Tsurumi Ku, Kanagawa 2300045, Japan, Univ Calif Santa Cruz, Dept Comp Sci, Howard Hughes Med Inst, Santa Cruz, CA 95064 USA, Univ Dublin Trinity Coll, Dept Genet, Smurfit Inst, Dublin 2, Ireland, Compaq Comp Corp, Cambridge Res Lab, Cambridge, MA 02142 USA, MIT, Genome Ctr, Cambridge, MA 02142 USA, Univ Calif Santa Cruz, Dept Math, Santa Cruz, CA 95064 USA, Univ Calif Santa Cruz, Dept Biol, Santa Cruz, CA 95064 USA, Weizmann Inst Sci, Crown Human Genet Ctr, IL-71600 Rehovot, Israel, Weizmann Inst Sci, Dept Mol Genet, IL-71600 Rehovot, Israel, Univ Oxford, Dept Human Anat & Genet, MRC, Funct Genet Unit, Oxford OX1 3QX, England, Inst Syst Biol, Seattle, WA 98105 USA, NHGRI, NIH, Bethesda, MD 20892 USA, US Dept Energy, Off Sci, Germantown, MD 20874 USA, Wellcome Trust, London NW1 2BE, England, Lander, E.S., Linton, L.M., Birren, B., Nusbaum, C., Zody, M.C., Baldwin, J., Devon, K., Dewar, K., Doyle, M., FitzHugh, W., Funke, R., Gage, D., Harris, K., Heaford, A., Howland, J., Kann, L., Lehoczky, J., LeVine, R., McEwan, P., McKernan, K., Meldrim, J., Mesirov, J.P., Miranda, C., Morris, W., Naylor, J., Raymond, C., Rosetti, M., Santos, R., Sheridan, A., Sougnez, C., Stange-Thomann, N., Stojanovic, N., Subramanian, A., Wyman, D., Rogers, J., Sulston, J., Ainscough, R., Beck, S., Bentley, D., Burton, J., Clee, C., Carter, N., Coulson, A., Deadman, R., Deloukas, P., Dunham, A., Dunham, I., Durbin, R., French, L., Grafham, D., Gregory, S., Hubbard, T., Humphray, S., Hunt, A., Jones, M., Lloyd, C., McMurray, A., Matthews, L., Mercer, S., Milne, S., Mullikin, J.C., Mungall, A., Plumb, R., Ross, M., Shownkeen, R., Sims, S., Waterston, R.H., Wilson, R.K., Hillier, L.W., McPherson, John D., Marra, M.A., Mardis, E.R., Fulton, L.A., Chinwalla, A.T., Pepin, K.H., Gish, W.R., Chissoe, S.L., Wendl, M.C., Delehaunty, K.D., Miner, T.L., Delehaunty, A., Kramer, J.B., Cook, L.L., Fulton, R.S., Johnson, D.L., Minx, P.J., Clifton, S.W., Hawkins, T., Branscomb, E., Predki, P., Richardson, P., Wenning, S., Slezak, T., Doggett, N., Cheng, J.F., Olsen, A., Lucas, S., Elkin, C., Uberbacher, E.C., Frazier, M., Gibbs, R.A., Muzny, D.M., Scherer, S.E., Bouck, J.B., Sodergren, E.J., Worley, K.C., Rives, C.M., Gorrell, J.H., Metzker, M.L., Naylor, S.L., Kucherlapati, R.S., Nelson, D.L., Weinstock, G.M., Sakaki, Y., Fujiyama, A., Hattori, M., Yada, T., Toyoda, A., Itoh, T., Kawagoe, C., Watanabe, H., Totoki, Y., Taylor, T., Weissenbach, J., Heilig, R., Saurin, W., Artiguenave, F., Brottier, P., Bruls, T., Pelletier, E., Robert, C., Wincker, P., Rosenthal, A., Platzer, M., Nyakatura, G., Taudien, S., Rump, A., Yang, H.M., Yu, J., Wang, J., Huang, G.Y., Gu, J., Hood, L., Rowen, L., Madan, A., Qin, S.Z., Davis, R.W., Federspiel, N.A., Abola, A.P., Proctor, M.J., Myers, R.M., Schmutz, J., Dickson, M., Grimwood, J., Cox, D.R., Olson, M.V., Kaul, R., Shimizu, N., Kawasaki, K., Minoshima, S., Evans, G.A., Athanasiou, M., Schultz, R., Roe, B.A., Chen, F., Pan, H.Q., Ramser, J., Lehrach, H., Reinhardt, R., McCombie, W.R., De la Bastide, M., Dedhia, N., Blocker, H., Hornischer, K., Nordsiek, G., Agarwala, R., Aravind, L., Bailey, J.A., Bateman, A., Batzoglou, S., Birney, E., Bork, P., Brown, D.G., Burge, C.B., Cerutti, L., Chen, H.C., Church, D., Clamp, M., Copley, R.R., Doerks, T., Eddy, S.R., Eichler, E.E., Furey, T.S., Galagan, J., Gilbert, Jgr, Harmon, C., Hayashizaki, Y., Haussler, D., Hermjakob, H., Hokamp, K., Jang, W.H., Johnson, L.S., Jones, T.A., Kasif, S., Kaspryzk, A., Kennedy, S., Kent, W.J., Kitts, P., Koonin, E.V., Korf, I., Kulp, D., Lancet, D., Lowe, T.M., McLysaght, A., Mikkelsen, T., Moran, J.V., Mulder, N., Pollara, V.J., Ponting, C.P., Schuler, G., Schultz, J.R., Slater, G., Smit, A.F.A., Stupka, E., Szustakowki, J., Thierry-Mieg, D., Thierry-Mieg, J., Wagner, L., Wallis, J., Wheeler, R., Williams, A., Wolf, Y.I., Wolfe, K.H., Yang, S.P., Yeh, R.F., Collins, F., Guyer, M.S., Peterson, J., Felsenfeld, A., Wetterstrand, K.A., Patrinos, A., Morgan, M.J., Univ Michigan, Sch Med, Dept Human Genet, Ann Arbor, MI 48109 USA, Univ Michigan, Sch Med, Dept Internal Med, Ann Arbor, MI 48109 USA, Whitehead Inst Biomed Res, Ctr Genome Res, Cambridge, MA 02142 USA, Sanger Ctr, Hinxton CB10 1RQ, Cambs, England, Washington Univ, Genome Sequencing Ctr, St Louis, MO 63108 USA, US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA, Baylor Coll Med, Human Genome Sequencing Ctr, Dept Mol & Human Genet, Houston, TX 77030 USA, Univ Texas, Hlth Sci Ctr, Dept Cellular & Struct Biol, San Antonio, TX 78229 USA, Yeshiva Univ Albert Einstein Coll Med, Dept Mol Genet, Bronx, NY 10461 USA, Univ Texas, Sch Med, Dept Microbiol & Mol Genet, Houston, TX 77225 USA, RIKEN, Genom Sci Ctr, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan, Genoscope, F-91057 Evry, France, CNRS, UMR 8030, F-91057 Evry, France, Genome Therapeut Corp, GTC Sequencing Ctr, Waltham, MA 02453 USA, Inst Mol Biotechnol, Dept Genome Anal, D-07745 Jena, Germany, Chinese Acad Sci, Inst Genet, Ctr Human Genome, Beijing Genom Inst, Beijing 100101, Peoples R China, So China Natl Human Genome Res Ctr, Shanghai 201203, Peoples R China, No China Natl Human Genome Res Ctr, Beijing 100176, Peoples R China, Inst Syst Biol, Multimegabase Sequencing Ctr, Seattle, WA 98105 USA, Stanford Genome Technol Ctr, Palo Alto, CA 94304 USA, Stanford Univ, Dept Genet, Sch Med, Stanford, CA 94305 USA, Stanford Univ, Stanford Human Genome Ctrr, Sch Med, Stanford, CA 94305 USA, Univ Washington, Genome Ctr, Seattle, WA 98195 USA, Keio Univ, Sch Med, Dept Biol Mol, Shinjuku Ku, Tokyo 1608582, Japan, Univ Texas, SW Med Ctr, Dallas, TX 75235 USA, Univ Oklahoma, Adv Ctr Genome Technol, Dept Chem & Biochem, Norman, OK 73019 USA, Max Planck Inst Mol Genet, D-14195 Berlin, Germany, Cold Spring Harbor Lab, Lita Annenberg Hazen Genome Ctr, Cold Spring Harbor, NY 11724 USA, GBF, German Res Ctr Biotechnol, D-38124 Braunschweig, Germany, NIH, Natl Ctr Biotechnol Informat, Natl Lib Med, Bethesda, MD 20894 USA, Case Western Reserve Univ, Sch Med, Dept Genet, Cleveland, OH 44106 USA, Univ Hosp Cleveland, Cleveland, OH 44106 USA, EMBL, European Bioinformat Inst, Cambridge CB10 1SD, England, Max Delbruck Ctr Mol Med, D-13125 Berlin, Germany, MIT, Dept Biol, Cambridge, MA 02139 USA, Washington Univ, Sch Med, Dept Genet, St Louis, MO 63110 USA, Univ Calif Santa Cruz, Dept Comp Sci, Santa Cruz, CA 95064 USA, Affymetrix Inc, Berkeley, CA 94710 USA, RIKEN, Yokoham Inst, Genom Sci Ctr, Genom Explorat Res Grp, Tsurumi Ku, Kanagawa 2300045, Japan, Univ Calif Santa Cruz, Dept Comp Sci, Howard Hughes Med Inst, Santa Cruz, CA 95064 USA, Univ Dublin Trinity Coll, Dept Genet, Smurfit Inst, Dublin 2, Ireland, Compaq Comp Corp, Cambridge Res Lab, Cambridge, MA 02142 USA, MIT, Genome Ctr, Cambridge, MA 02142 USA, Univ Calif Santa Cruz, Dept Math, Santa Cruz, CA 95064 USA, Univ Calif Santa Cruz, Dept Biol, Santa Cruz, CA 95064 USA, Weizmann Inst Sci, Crown Human Genet Ctr, IL-71600 Rehovot, Israel, Weizmann Inst Sci, Dept Mol Genet, IL-71600 Rehovot, Israel, Univ Oxford, Dept Human Anat & Genet, MRC, Funct Genet Unit, Oxford OX1 3QX, England, Inst Syst Biol, Seattle, WA 98105 USA, NHGRI, NIH, Bethesda, MD 20892 USA, US Dept Energy, Off Sci, Germantown, MD 20874 USA, Wellcome Trust, London NW1 2BE, England, Lander, E.S., Linton, L.M., Birren, B., Nusbaum, C., Zody, M.C., Baldwin, J., Devon, K., Dewar, K., Doyle, M., FitzHugh, W., Funke, R., Gage, D., Harris, K., Heaford, A., Howland, J., Kann, L., Lehoczky, J., LeVine, R., McEwan, P., McKernan, K., Meldrim, J., Mesirov, J.P., Miranda, C., Morris, W., Naylor, J., Raymond, C., Rosetti, M., Santos, R., Sheridan, A., Sougnez, C., Stange-Thomann, N., Stojanovic, N., Subramanian, A., Wyman, D., Rogers, J., Sulston, J., Ainscough, R., Beck, S., Bentley, D., Burton, J., Clee, C., Carter, N., Coulson, A., Deadman, R., Deloukas, P., Dunham, A., Dunham, I., Durbin, R., French, L., Grafham, D., Gregory, S., Hubbard, T., Humphray, S., Hunt, A., Jones, M., Lloyd, C., McMurray, A., Matthews, L., Mercer, S., Milne, S., Mullikin, J.C., Mungall, A., Plumb, R., Ross, M., Shownkeen, R., Sims, S., Waterston, R.H., Wilson, R.K., Hillier, L.W., McPherson, John D., Marra, M.A., Mardis, E.R., Fulton, L.A., Chinwalla, A.T., Pepin, K.H., Gish, W.R., Chissoe, S.L., Wendl, M.C., Delehaunty, K.D., Miner, T.L., Delehaunty, A., Kramer, J.B., Cook, L.L., Fulton, R.S., Johnson, D.L., Minx, P.J., Clifton, S.W., Hawkins, T., Branscomb, E., Predki, P., Richardson, P., Wenning, S., Slezak, T., Doggett, N., Cheng, J.F., Olsen, A., Lucas, S., Elkin, C., Uberbacher, E.C., Frazier, M., Gibbs, R.A., Muzny, D.M., Scherer, S.E., Bouck, J.B., Sodergren, E.J., Worley, K.C., Rives, C.M., Gorrell, J.H., Metzker, M.L., Naylor, S.L., Kucherlapati, R.S., Nelson, D.L., Weinstock, G.M., Sakaki, Y., Fujiyama, A., Hattori, M., Yada, T., Toyoda, A., Itoh, T., Kawagoe, C., Watanabe, H., Totoki, Y., Taylor, T., Weissenbach, J., Heilig, R., Saurin, W., Artiguenave, F., Brottier, P., Bruls, T., Pelletier, E., Robert, C., Wincker, P., Rosenthal, A., Platzer, M., Nyakatura, G., Taudien, S., Rump, A., Yang, H.M., Yu, J., Wang, J., Huang, G.Y., Gu, J., Hood, L., Rowen, L., Madan, A., Qin, S.Z., Davis, R.W., Federspiel, N.A., Abola, A.P., Proctor, M.J., Myers, R.M., Schmutz, J., Dickson, M., Grimwood, J., Cox, D.R., Olson, M.V., Kaul, R., Shimizu, N., Kawasaki, K., Minoshima, S., Evans, G.A., Athanasiou, M., Schultz, R., Roe, B.A., Chen, F., Pan, H.Q., Ramser, J., Lehrach, H., Reinhardt, R., McCombie, W.R., De la Bastide, M., Dedhia, N., Blocker, H., Hornischer, K., Nordsiek, G., Agarwala, R., Aravind, L., Bailey, J.A., Bateman, A., Batzoglou, S., Birney, E., Bork, P., Brown, D.G., Burge, C.B., Cerutti, L., Chen, H.C., Church, D., Clamp, M., Copley, R.R., Doerks, T., Eddy, S.R., Eichler, E.E., Furey, T.S., Galagan, J., Gilbert, Jgr, Harmon, C., Hayashizaki, Y., Haussler, D., Hermjakob, H., Hokamp, K., Jang, W.H., Johnson, L.S., Jones, T.A., Kasif, S., Kaspryzk, A., Kennedy, S., Kent, W.J., Kitts, P., Koonin, E.V., Korf, I., Kulp, D., Lancet, D., Lowe, T.M., McLysaght, A., Mikkelsen, T., Moran, J.V., Mulder, N., Pollara, V.J., Ponting, C.P., Schuler, G., Schultz, J.R., Slater, G., Smit, A.F.A., Stupka, E., Szustakowki, J., Thierry-Mieg, D., Thierry-Mieg, J., Wagner, L., Wallis, J., Wheeler, R., Williams, A., Wolf, Y.I., Wolfe, K.H., Yang, S.P., Yeh, R.F., Collins, F., Guyer, M.S., Peterson, J., Felsenfeld, A., Wetterstrand, K.A., Patrinos, A., and Morgan, M.J.
- Abstract
The human genome holds an extraordinary trove of information about human development, physiology, medicine and evolution. Here we report the results of an international collaboration to produce and make freely available a draft sequence of the human genome. We also present an initial analysis of the data, describing some of the insights that can be gleaned from the sequence.
- Published
- 2009
8. Genomic Analysis of the Basal Lineage Fungus Rhizopus oryzae Reveals a Whole-Genome Duplication
- Author
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Madhani, HD, Ma, L-J, Ibrahim, AS, Skory, C, Grabherr, MG, Burger, G, Butler, M, Elias, M, Idnurm, A, Lang, BF, Sone, T, Abe, A, Calvo, SE, Corrochano, LM, Engels, R, Fu, J, Hansberg, W, Kim, J-M, Kodira, CD, Koehrsen, MJ, Liu, B, Miranda-Saavedra, D, O'Leary, S, Ortiz-Castellanos, L, Poulter, R, Rodriguez-Romero, J, Ruiz-Herrera, J, Shen, Y-Q, Zeng, Q, Galagan, J, Birren, BW, Cuomo, CA, Wickes, BL, Madhani, HD, Ma, L-J, Ibrahim, AS, Skory, C, Grabherr, MG, Burger, G, Butler, M, Elias, M, Idnurm, A, Lang, BF, Sone, T, Abe, A, Calvo, SE, Corrochano, LM, Engels, R, Fu, J, Hansberg, W, Kim, J-M, Kodira, CD, Koehrsen, MJ, Liu, B, Miranda-Saavedra, D, O'Leary, S, Ortiz-Castellanos, L, Poulter, R, Rodriguez-Romero, J, Ruiz-Herrera, J, Shen, Y-Q, Zeng, Q, Galagan, J, Birren, BW, Cuomo, CA, and Wickes, BL
- Abstract
Rhizopus oryzae is the primary cause of mucormycosis, an emerging, life-threatening infection characterized by rapid angioinvasive growth with an overall mortality rate that exceeds 50%. As a representative of the paraphyletic basal group of the fungal kingdom called "zygomycetes," R. oryzae is also used as a model to study fungal evolution. Here we report the genome sequence of R. oryzae strain 99-880, isolated from a fatal case of mucormycosis. The highly repetitive 45.3 Mb genome assembly contains abundant transposable elements (TEs), comprising approximately 20% of the genome. We predicted 13,895 protein-coding genes not overlapping TEs, many of which are paralogous gene pairs. The order and genomic arrangement of the duplicated gene pairs and their common phylogenetic origin provide evidence for an ancestral whole-genome duplication (WGD) event. The WGD resulted in the duplication of nearly all subunits of the protein complexes associated with respiratory electron transport chains, the V-ATPase, and the ubiquitin-proteasome systems. The WGD, together with recent gene duplications, resulted in the expansion of multiple gene families related to cell growth and signal transduction, as well as secreted aspartic protease and subtilase protein families, which are known fungal virulence factors. The duplication of the ergosterol biosynthetic pathway, especially the major azole target, lanosterol 14alpha-demethylase (ERG11), could contribute to the variable responses of R. oryzae to different azole drugs, including voriconazole and posaconazole. Expanded families of cell-wall synthesis enzymes, essential for fungal cell integrity but absent in mammalian hosts, reveal potential targets for novel and R. oryzae-specific diagnostic and therapeutic treatments.
- Published
- 2009
9. Dothideomycete-plant interactions illuminated by genome sequencing and EST analysis of the wheat pathogen Stagonospora nodorum
- Author
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Hane, J., Lowe, R., Solomon, P., Tan, Kar-Chun, Schoch, C., Spatafora, J., Crous, P., Kodira, C., Birren, B., Galagan, J., Torriani, S., McDonald, B., Oliver, Richard, Hane, J., Lowe, R., Solomon, P., Tan, Kar-Chun, Schoch, C., Spatafora, J., Crous, P., Kodira, C., Birren, B., Galagan, J., Torriani, S., McDonald, B., and Oliver, Richard
- Abstract
Stagonospora nodorum is a major necrotrophic fungal pathogen of wheat (Triticum aestivum) and a member of the Dothideomycetes, a large fungal taxon that includes many important plant pathogens affecting all major crop plant families. Here, we report the acquisition and initial analysis of a draft genome sequence for this fungus. The assembly comprises 37,164,227 bp of nuclear DNA contained in 107 scaffolds. The circular mitochondrial genome comprises 49,761 bp encoding 46 genes, including four that are intron encoded. The nuclear genome assembly contains 26 classes of repetitive DNA, comprising 4.5% of the genome. Some of the repeats show evidence of repeat-induced point mutations consistent with a frequent sexual cycle. ESTs and gene prediction models support a minimum of 10,762 nuclear genes. Extensive orthology was found between the polyketide synthase family in S. nodorum and Cochliobolus heterostrophus, suggesting an ancient origin and conserved functions for these genes. A striking feature of the gene catalog was the large number of genes predicted to encode secreted proteins; the majority has no meaningful similarity to any other known genes. It is likely that genes for host-specific toxins, in addition to ToxA, will be found among this group. ESTs obtained from axenic mycelium grown on oleate (chosen to mimic early infection) and late-stage lesions sporulating on wheat leaves were obtained. Statistical analysis shows that transcripts encoding proteins involved in protein synthesis and in the production of extracellular proteases, cellulases, and xylanases predominate in the infection library. This suggests that the fungus is dependant on the degradation of wheat macromolecular constituents to provide the carbon skeletons and energy for the synthesis of proteins and other components destined for the developing pycnidiospores.
- Published
- 2007
10. GenomeView: a next-generation genome browser
- Author
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Abeel, T., primary, Van Parys, T., additional, Saeys, Y., additional, Galagan, J., additional, and Van de Peer, Y., additional
- Published
- 2011
- Full Text
- View/download PDF
11. Genome Variation in Cryptococcus gattii, an Emerging Pathogen of Immunocompetent Hosts
- Author
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D’Souza, C. A., primary, Kronstad, J. W., additional, Taylor, G., additional, Warren, R., additional, Yuen, M., additional, Hu, G., additional, Jung, W. H., additional, Sham, A., additional, Kidd, S. E., additional, Tangen, K., additional, Lee, N., additional, Zeilmaker, T., additional, Sawkins, J., additional, McVicker, G., additional, Shah, S., additional, Gnerre, S., additional, Griggs, A., additional, Zeng, Q., additional, Bartlett, K., additional, Li, W., additional, Wang, X., additional, Heitman, J., additional, Stajich, J. E., additional, Fraser, J. A., additional, Meyer, W., additional, Carter, D., additional, Schein, J., additional, Krzywinski, M., additional, Kwon-Chung, K. J., additional, Varma, A., additional, Wang, J., additional, Brunham, R., additional, Fyfe, M., additional, Ouellette, B. F. F., additional, Siddiqui, A., additional, Marra, M., additional, Jones, S., additional, Holt, R., additional, Birren, B. W., additional, Galagan, J. E., additional, and Cuomo, C. A., additional
- Published
- 2011
- Full Text
- View/download PDF
12. TB database: an integrated platform for tuberculosis research
- Author
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Reddy, T. B. K., primary, Riley, R., additional, Wymore, F., additional, Montgomery, P., additional, DeCaprio, D., additional, Engels, R., additional, Gellesch, M., additional, Hubble, J., additional, Jen, D., additional, Jin, H., additional, Koehrsen, M., additional, Larson, L., additional, Mao, M., additional, Nitzberg, M., additional, Sisk, P., additional, Stolte, C., additional, Weiner, B., additional, White, J., additional, Zachariah, Z. K., additional, Sherlock, G., additional, Galagan, J. E., additional, Ball, C. A., additional, and Schoolnik, G. K., additional
- Published
- 2009
- Full Text
- View/download PDF
13. Dual Modes of Natural Selection on Upstream Open Reading Frames
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Neafsey, D. E., primary and Galagan, J. E., additional
- Published
- 2007
- Full Text
- View/download PDF
14. Independent large scale duplications in multiple M. tuberculosis lineages overlapping the same genomic region
- Author
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Weiner, B., Gomez, J., Victor, T. C., Warren, R. M., Sloutsky, A., Plikaytis, B. B., Posey, J. E., van Helden, P. D., Gey van Pittius, N. C., Koehrsen, M., Sisk, P., Stolte, C., White, J., Gagneux, S., Birren, B., Hung, D., Murray, M., and Galagan, J.
- Subjects
3. Good health
15. Genomic Analysis Identifies Targets of Convergent Positive Selection in Drug Resistant Mycobacterium tuberculosis
- Author
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Sebastien Gagneux, Bruce W. Birren, Bhavana Muddukrishna, Robin M. Warren, Jennifer L. Gardy, B. Jesse Shapiro, Eric J. Rubin, Devinder Kaur, Midori Kato-Maeda, Megan Murray, Jamie E. Posey, Natalia Kurepina, Maha R. Farhat, Alistair Calver, Pardis C. Sabeti, Patrick Tang, Bonnie B. Plikaytis, Eric S. Lander, Alexander Sloutsky, Razvan Sultana, Mark L. Borowsky, Elizabeth M. Streicher, Thomas C. Victor, Karen R. Jacobson, Mabel Rodrigues, James C. Johnston, Karen J. Kieser, James E. Galagan, Barry N. Kreiswirth, Marco R. Oggioni, Massachusetts Institute of Technology. Department of Biology, Lander, Eric S., Farhat MR, Shapiro BJ, Kieser KJ, Sultana R, Jacobson KR, Victor TC, Warren RM, Streicher EM, Calver A, Sloutsky A, Kaur D, Posey JE, Plikaytis B, Oggioni MR, Gardy JL, Johnston JC, Rodrigues M, Tang PK, Kato-Maeda M, Borowsky ML, Muddukrishna B, Kreiswirth BN, Kurepina N, Galagan J, Gagneux S, Birren B, Rubin EJ, Lander ES, Sabeti PC, and Murray M
- Subjects
Tuberculosis ,DNA Repair ,Drug resistance ,medicine.disease_cause ,Genetic analysis ,Genome ,Article ,Mycobacterium tuberculosis ,03 medical and health sciences ,Antibiotic resistance ,Genetics ,medicine ,Selection, Genetic ,Gene ,030304 developmental biology ,0303 health sciences ,Mutation ,genomics, tuberculosis, mutations, compensatory mutations, resistance, drug resistance ,biology ,030306 microbiology ,Drug Resistance, Microbial ,biology.organism_classification ,medicine.disease ,3. Good health - Abstract
M. tuberculosis is evolving antibiotic resistance, threatening attempts at tuberculosis epidemic control. Mechanisms of resistance, including genetic changes favored by selection in resistant isolates, are incompletely understood. Using 116 newly sequenced and 7 previously sequenced M. tuberculosis whole genomes, we identified genome-wide signatures of positive selection specific to the 47 drug-resistant strains. By searching for convergent evolution--the independent fixation of mutations in the same nucleotide position or gene--we recovered 100% of a set of known resistance markers. We also found evidence of positive selection in an additional 39 genomic regions in resistant isolates. These regions encode components in cell wall biosynthesis, transcriptional regulation and DNA repair pathways. Mutations in these regions could directly confer resistance or compensate for fitness costs associated with resistance. Functional genetic analysis of mutations in one gene, ponA1, demonstrated an in vitro growth advantage in the presence of the drug rifampicin.
- Published
- 2013
16. A Cryptic Prophage Transcription Factor Drives Phenotypic Changes via Host Gene Regulation.
- Author
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Lally P, Tierrafría VH, Gómez-Romero L, Stringer A, Collado-Vides J, Wade JT, and Galagan JE
- Abstract
Cryptic prophages (CPs) are elements of bacterial genomes acquired from bacteriophage that infect the host cell and ultimately become stably integrated within the host genome. While some proteins encoded by CPs can modulate host phenotypes, the potential for Transcription Factors (TFs) encoded by CPs to impact host physiology by regulating host genes has not been thoroughly investigated. In this work, we report hundreds of host genes regulated by DicC, a DNA-binding TF encoded in the Qin prophage of Esherichia coli . We identified host-encoded regulatory targets of DicC that could be linked to known phenotypes of its induction. We also demonstrate that a DicC-induced growth defect is largely independent of other Qin prophage genes. Our data suggest a greater role for cryptic prophage TFs in controlling bacterial host gene expression than previously appreciated.
- Published
- 2024
- Full Text
- View/download PDF
17. Development and Clinical Validation of Iso-IMRS: A Novel Diagnostic Assay for P. falciparum Malaria.
- Author
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Kolluri N, Kamath S, Lally P, Zanna M, Galagan J, Gitaka J, Kamita M, Cabodi M, Lolabattu SR, and Klapperich CM
- Subjects
- DNA, Protozoan isolation & purification, Humans, Limit of Detection, Plasmodium falciparum isolation & purification, Reproducibility of Results, DNA, Protozoan genetics, Malaria, Falciparum diagnosis, Nucleic Acid Amplification Techniques methods, Plasmodium falciparum genetics, Repetitive Sequences, Nucleic Acid genetics
- Abstract
In many countries targeting malaria elimination, persistent malaria infections can have parasite loads significantly below the lower limit of detection (LLOD) of standard diagnostic techniques, making them difficult to identify and treat. The most sensitive diagnostic methods involve amplification and detection of Plasmodium DNA by polymerase chain reaction (PCR), which requires expensive thermal cycling equipment and is difficult to deploy in resource-limited settings. Isothermal DNA amplification assays have been developed, but they require complex primer design, resulting in high nonspecific amplification, and show a decrease in sensitivity than PCR methods. Here, we have used a computational approach to design a novel isothermal amplification assay with a simple primer design to amplify P. falciparum DNA with analytical sensitivity comparable to PCR. We have identified short DNA sequences repeated throughout the parasite genome to be used as primers for DNA amplification and demonstrated that these primers can be used, without modification, to isothermally amplify P. falciparum parasite DNA via strand displacement amplification. Our novel assay shows a LLOD of ∼1 parasite/μL within a 30 min amplification time. The assay was demonstrated with clinical samples using patient blood and saliva. We further characterized the assay using direct amplicon next-generation sequencing and modified the assay to work with a visual readout. The technique developed here achieves similar analytical sensitivity to current gold standard PCR assays requiring a fraction of time and resources for PCR. This highly sensitive isothermal assay can be more easily adapted to field settings, making it a potentially useful tool for malaria elimination.
- Published
- 2021
- Full Text
- View/download PDF
18. A Förster Resonance Energy Transfer-Based Ratiometric Sensor with the Allosteric Transcription Factor TetR.
- Author
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Nguyen TT, Chern M, Baer RC, Galagan J, and Dennis AM
- Subjects
- Fluorescent Dyes, Quantum Dots, Biosensing Techniques instrumentation, DNA metabolism, Fluorescence Resonance Energy Transfer, Transcription Factors metabolism
- Abstract
A recent description of an antibody-free assay is significantly extended for small molecule analytes using allosteric transcription factors (aTFs) and Förster resonance energy transfer (FRET). The FRET signal indicates the differential binding of an aTF-DNA pair with a dose-dependent response to its effector molecule, i.e., the analyte. The new sensors described here, based on the well-characterized aTF TetR, demonstrate several new features of the assay approach: 1) the generalizability of the sensors to additional aTF-DNA-analyte systems, 2) sensitivity modulation through the choice of donor fluorophore (quantum dots or fluorescent proteins, FPs), and 3) sensor tuning using aTF variants with differing aTF-DNA binding affinities. While all of these modular sensors self-assemble, the design reported here based on a recombinant aTF-FP chimera with commercially available dye-labeled DNA uses readily accessible sensor components to facilitate easy adoption of the sensing approach by the broader community., (© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
- Published
- 2020
- Full Text
- View/download PDF
19. RegulonDB v 10.5: tackling challenges to unify classic and high throughput knowledge of gene regulation in E. coli K-12.
- Author
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Santos-Zavaleta A, Salgado H, Gama-Castro S, Sánchez-Pérez M, Gómez-Romero L, Ledezma-Tejeida D, García-Sotelo JS, Alquicira-Hernández K, Muñiz-Rascado LJ, Peña-Loredo P, Ishida-Gutiérrez C, Velázquez-Ramírez DA, Del Moral-Chávez V, Bonavides-Martínez C, Méndez-Cruz CF, Galagan J, and Collado-Vides J
- Subjects
- Gene Ontology, Gene Regulatory Networks, High-Throughput Nucleotide Sequencing, Computational Biology methods, Escherichia coli K12 genetics, Gene Expression Regulation, Bacterial, Genomics methods
- Abstract
RegulonDB, first published 20 years ago, is a comprehensive electronic resource about regulation of transcription initiation of Escherichia coli K-12 with decades of knowledge from classic molecular biology experiments, and recently also from high-throughput genomic methodologies. We curated the literature to keep RegulonDB up to date, and initiated curation of ChIP and gSELEX experiments. We estimate that current knowledge describes between 10% and 30% of the expected total number of transcription factor- gene regulatory interactions in E. coli. RegulonDB provides datasets for interactions for which there is no evidence that they affect expression, as well as expression datasets. We developed a proof of concept pipeline to merge binding and expression evidence to identify regulatory interactions. These datasets can be visualized in the RegulonDB JBrowse. We developed the Microbial Conditions Ontology with a controlled vocabulary for the minimal properties to reproduce an experiment, which contributes to integrate data from high throughput and classic literature. At a higher level of integration, we report Genetic Sensory-Response Units for 200 transcription factors, including their regulation at the metabolic level, and include summaries for 70 of them. Finally, we summarize our research with Natural language processing strategies to enhance our biocuration work.
- Published
- 2019
- Full Text
- View/download PDF
20. Reply to Lee and Howden.
- Author
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Manson AL, Abeel T, Galagan J, Sundaramurthi JC, Shanmugam SK, Palaniyandi K, Narayanan S, Swaminathan S, and Earl AM
- Subjects
- Diagnostic Tests, Routine, Drug Resistance, Bacterial, India, Mycobacterium tuberculosis
- Published
- 2018
- Full Text
- View/download PDF
21. Genetic Determinants of Drug Resistance in Mycobacterium tuberculosis and Their Diagnostic Value.
- Author
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Farhat MR, Sultana R, Iartchouk O, Bozeman S, Galagan J, Sisk P, Stolte C, Nebenzahl-Guimaraes H, Jacobson K, Sloutsky A, Kaur D, Posey J, Kreiswirth BN, Kurepina N, Rigouts L, Streicher EM, Victor TC, Warren RM, van Soolingen D, and Murray M
- Subjects
- Drug Resistance, Multiple, Bacterial drug effects, Genes, Bacterial drug effects, Genes, Bacterial genetics, Humans, Mutation drug effects, Mutation genetics, Mycobacterium tuberculosis drug effects, Mycobacterium tuberculosis isolation & purification, Sequence Analysis, DNA, Tuberculosis, Multidrug-Resistant drug therapy, Tuberculosis, Multidrug-Resistant microbiology, Antitubercular Agents pharmacology, Drug Resistance, Multiple, Bacterial genetics, Molecular Diagnostic Techniques, Mycobacterium tuberculosis genetics, Tuberculosis, Multidrug-Resistant genetics
- Abstract
Rationale: The development of molecular diagnostics that detect both the presence of Mycobacterium tuberculosis in clinical samples and drug resistance-conferring mutations promises to revolutionize patient care and interrupt transmission by ensuring early diagnosis. However, these tools require the identification of genetic determinants of resistance to the full range of antituberculosis drugs., Objectives: To determine the optimal molecular approach needed, we sought to create a comprehensive catalog of resistance mutations and assess their sensitivity and specificity in diagnosing drug resistance., Methods: We developed and validated molecular inversion probes for DNA capture and deep sequencing of 28 drug-resistance loci in M. tuberculosis. We used the probes for targeted sequencing of a geographically diverse set of 1,397 clinical M. tuberculosis isolates with known drug resistance phenotypes. We identified a minimal set of mutations to predict resistance to first- and second-line antituberculosis drugs and validated our predictions in an independent dataset. We constructed and piloted a web-based database that provides public access to the sequence data and prediction tool., Measurements and Main Results: The predicted resistance to rifampicin and isoniazid exceeded 90% sensitivity and specificity but was lower for other drugs. The number of mutations needed to diagnose resistance is large, and for the 13 drugs studied it was 238 across 18 genetic loci., Conclusions: These data suggest that a comprehensive M. tuberculosis drug resistance diagnostic will need to allow for a high dimension of mutation detection. They also support the hypothesis that currently unknown genetic determinants, potentially discoverable by whole-genome sequencing, encode resistance to second-line tuberculosis drugs.
- Published
- 2016
- Full Text
- View/download PDF
22. Simulating Serial-Target Antibacterial Drug Synergies Using Flux Balance Analysis.
- Author
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Krueger AS, Munck C, Dantas G, Church GM, Galagan J, Lehár J, and Sommer MO
- Subjects
- Drug Synergism, Epistasis, Genetic, Escherichia coli drug effects, Genes, Bacterial, Inhibitory Concentration 50, Metabolic Engineering, Metabolic Flux Analysis, Metabolic Networks and Pathways, Microbial Sensitivity Tests, Microbial Viability, Anti-Bacterial Agents pharmacology, Escherichia coli metabolism
- Abstract
Flux balance analysis (FBA) is an increasingly useful approach for modeling the behavior of metabolic systems. However, standard FBA modeling of genetic knockouts cannot predict drug combination synergies observed between serial metabolic targets, even though such synergies give rise to some of the most widely used antibiotic treatments. Here we extend FBA modeling to simulate responses to chemical inhibitors at varying concentrations, by diverting enzymatic flux to a waste reaction. This flux diversion yields very similar qualitative predictions to prior methods for single target activity. However, we find very different predictions for combinations, where flux diversion, which mimics the kinetics of competitive metabolic inhibitors, can explain serial target synergies between metabolic enzyme inhibitors that we confirmed in Escherichia coli cultures. FBA flux diversion opens the possibility for more accurate genome-scale predictions of drug synergies, which can be used to suggest treatments for infections and other diseases.
- Published
- 2016
- Full Text
- View/download PDF
23. Decoding ChIP-seq with a double-binding signal refines binding peaks to single-nucleotides and predicts cooperative interaction.
- Author
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Gomes AL, Abeel T, Peterson M, Azizi E, Lyubetskaya A, Carvalho L, and Galagan J
- Subjects
- Chromatin Immunoprecipitation, DNA-Binding Proteins metabolism, Models, Genetic, Nucleotides metabolism, Sequence Analysis, DNA, Algorithms, Binding Sites, Computational Biology methods
- Abstract
The comprehension of protein and DNA binding in vivo is essential to understand gene regulation. Chromatin immunoprecipitation followed by sequencing (ChIP-seq) provides a global map of the regulatory binding network. Most ChIP-seq analysis tools focus on identifying binding regions from coverage enrichment. However, less work has been performed to infer the physical and regulatory details inside the enriched regions. This research extends a previous blind-deconvolution approach to develop a post-peak-calling algorithm that improves binding site resolution and predicts cooperative interactions. At the core of our new method is a physically motivated model that characterizes the binding signal as an extreme value distribution. This model suggests a mathematical framework to study physical properties of DNA shearing from the ChIP-seq coverage. The model explains the ChIP-seq coverage with two signals: The first considers DNA fragments with only a single binding event, whereas the second considers fragments with two binding events (a double-binding signal). The model incorporates motif discovery and is able to detect multiple sites in an enriched region with single-nucleotide resolution, high sensitivity, and high specificity. Our method improves peak caller sensitivity, from less than 45% up to 94%, at a false positive rate < 11% for a set of 47 experimentally validated prokaryotic sites. It also improves resolution of highly enriched regions of large-scale eukaryotic data sets. The double-binding signal provides a novel application in ChIP-seq analysis: the identification of cooperative interaction. Predictions of known cooperative binding sites show a 0.85 area under an ROC curve., (© 2014 Gomes et al.; Published by Cold Spring Harbor Laboratory Press.)
- Published
- 2014
- Full Text
- View/download PDF
24. Transcription Factor Binding Site Mapping Using ChIP-Seq.
- Author
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Jaini S, Lyubetskaya A, Gomes A, Peterson M, Tae Park S, Raman S, Schoolnik G, and Galagan J
- Subjects
- Binding Sites, Computational Biology methods, Genetics, Microbial methods, Protein Binding, Chromatin Immunoprecipitation methods, DNA metabolism, Molecular Biology methods, Mycobacterium tuberculosis genetics, Sequence Analysis, DNA methods, Transcription Factors metabolism
- Abstract
Transcription factors (TFs) play a central role in regulating gene expression in all bacteria. Yet until recently, studies of TF binding were limited to a small number of factors at a few genomic locations. Chromatin immunoprecipitation followed by sequencing (ChIP-Seq) provides the ability to map binding sites globally for TFs, and the scalability of the technology enables the ability to map binding sites for every DNA binding protein in a prokaryotic organism. We have developed a protocol for ChIP-Seq tailored for use with mycobacteria and an analysis pipeline for processing the resulting data. The protocol and pipeline have been used to map over 100 TFs from Mycobacterium tuberculosis, as well as numerous TFs from related mycobacteria and other bacteria. The resulting data provide evidence that the long-accepted spatial relationship between TF binding site, promoter motif, and the corresponding regulated gene may be too simple a paradigm, failing to adequately capture the variety of TF binding sites found in prokaryotes. In this article we describe the protocol and analysis pipeline, the validation of these methods, and the results of applying these methods to M. tuberculosis.
- Published
- 2014
- Full Text
- View/download PDF
25. Genomic analysis identifies targets of convergent positive selection in drug-resistant Mycobacterium tuberculosis.
- Author
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Farhat MR, Shapiro BJ, Kieser KJ, Sultana R, Jacobson KR, Victor TC, Warren RM, Streicher EM, Calver A, Sloutsky A, Kaur D, Posey JE, Plikaytis B, Oggioni MR, Gardy JL, Johnston JC, Rodrigues M, Tang PK, Kato-Maeda M, Borowsky ML, Muddukrishna B, Kreiswirth BN, Kurepina N, Galagan J, Gagneux S, Birren B, Rubin EJ, Lander ES, Sabeti PC, and Murray M
- Subjects
- DNA Repair, Mutation, Mycobacterium tuberculosis genetics, Drug Resistance, Microbial genetics, Mycobacterium tuberculosis drug effects, Selection, Genetic
- Abstract
M. tuberculosis is evolving antibiotic resistance, threatening attempts at tuberculosis epidemic control. Mechanisms of resistance, including genetic changes favored by selection in resistant isolates, are incompletely understood. Using 116 newly sequenced and 7 previously sequenced M. tuberculosis whole genomes, we identified genome-wide signatures of positive selection specific to the 47 drug-resistant strains. By searching for convergent evolution--the independent fixation of mutations in the same nucleotide position or gene--we recovered 100% of a set of known resistance markers. We also found evidence of positive selection in an additional 39 genomic regions in resistant isolates. These regions encode components in cell wall biosynthesis, transcriptional regulation and DNA repair pathways. Mutations in these regions could directly confer resistance or compensate for fitness costs associated with resistance. Functional genetic analysis of mutations in one gene, ponA1, demonstrated an in vitro growth advantage in the presence of the drug rifampicin.
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- 2013
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26. The role of selection in shaping diversity of natural M. tuberculosis populations.
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Pepperell CS, Casto AM, Kitchen A, Granka JM, Cornejo OE, Holmes EC, Birren B, Galagan J, and Feldman MW
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- Genome, Bacterial, Humans, Mycobacterium tuberculosis classification, Phylogeny, Recombination, Genetic, Tuberculosis genetics, Evolution, Molecular, Mycobacterium tuberculosis genetics, Polymorphism, Genetic genetics, Selection, Genetic genetics, Tuberculosis microbiology
- Abstract
Mycobacterium tuberculosis (M.tb), the cause of tuberculosis (TB), is estimated to infect a new host every second. While analyses of genetic data from natural populations of M.tb have emphasized the role of genetic drift in shaping patterns of diversity, the influence of natural selection on this successful pathogen is less well understood. We investigated the effects of natural selection on patterns of diversity in 63 globally extant genomes of M.tb and related pathogenic mycobacteria. We found evidence of strong purifying selection, with an estimated genome-wide selection coefficient equal to -9.5 × 10(-4) (95% CI -1.1 × 10(-3) to -6.8 × 10(-4)); this is several orders of magnitude higher than recent estimates for eukaryotic and prokaryotic organisms. We also identified different patterns of variation across categories of gene function. Genes involved in transport and metabolism of inorganic ions exhibited very low levels of non-synonymous polymorphism, equivalent to categories under strong purifying selection (essential and translation-associated genes). The highest levels of non-synonymous variation were seen in a group of transporter genes, likely due to either diversifying selection or local selective sweeps. In addition to selection, we identified other important influences on M.tb genetic diversity, such as a 25-fold expansion of global M.tb populations coincident with explosive growth in human populations (estimated timing 1684 C.E., 95% CI 1620-1713 C.E.). These results emphasize the parallel demographic histories of this obligate pathogen and its human host, and suggest that the dominant effect of selection on M.tb is removal of novel variants, with exceptions in an interesting group of genes involved in transportation and defense. We speculate that the hostile environment within a host imposes strict demands on M.tb physiology, and thus a substantial fitness cost for most new mutations. In this respect, obligate bacterial pathogens may differ from other host-associated microbes such as symbionts.
- Published
- 2013
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27. ChIP-Seq and the complexity of bacterial transcriptional regulation.
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Galagan J, Lyubetskaya A, and Gomes A
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- Binding Sites, Lac Operon, Sequence Analysis, Transcription, Genetic, Chromatin Immunoprecipitation, Gene Expression Regulation, Bacterial, Mycobacterium tuberculosis genetics, Transcription Factors metabolism
- Abstract
Transcription factors (TFs) play a central role in regulating gene expression in all bacteria. Yet, until recently, studies of TF binding were limited to a small number of factors at a few genomic locations. Chromatin immunoprecipitation followed by sequencing enables mapping of binding sites for TFs in a global and high-throughput fashion. The NIAID funded TB systems biology project http://www.broadinstitute.org/annotation/tbsysbio/home.html aims to map the binding sites for every transcription factor in the genome of Mycobacterium tuberculosis (MTB), the causative agent of human TB. ChIP-Seq data already released through TBDB.org have provided new insight into the mechanisms of TB pathogenesis. But in addition, data from MTB are beginning to challenge many simplifying assumptions associated with gene regulation in all bacteria. In this chapter, we review the global aspects of TF binding in MTB and discuss the implications of these data for our understanding of bacterial gene regulation. We begin by reviewing the canonical model of bacterial transcriptional regulation using the lac operon as the standard paradigm. We then review the use of ChIP-Seq to map the binding sites of DNA-binding proteins and the application of this method to mapping TF binding sites in MTB. Finally, we discuss two aspects of the binding discovered by ChIP-Seq that were unexpected given the canonical model: the substantial binding outside the proximal promoter region and the large number of weak binding sites.
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- 2013
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28. Comparative analysis of Mycobacterium and related Actinomycetes yields insight into the evolution of Mycobacterium tuberculosis pathogenesis.
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McGuire AM, Weiner B, Park ST, Wapinski I, Raman S, Dolganov G, Peterson M, Riley R, Zucker J, Abeel T, White J, Sisk P, Stolte C, Koehrsen M, Yamamoto RT, Iacobelli-Martinez M, Kidd MJ, Maer AM, Schoolnik GK, Regev A, and Galagan J
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- Actinobacteria classification, Bacterial Proteins genetics, Bacterial Proteins metabolism, Coenzymes genetics, Coenzymes metabolism, DNA Repair, Databases, Genetic, Fatty Acids genetics, Fatty Acids metabolism, Genome, Bacterial, Genomics, Lipid Metabolism genetics, Metalloproteins genetics, Metalloproteins metabolism, Molybdenum Cofactors, Mycobacterium classification, Mycobacterium tuberculosis classification, Phylogeny, Pteridines metabolism, RNA, Untranslated chemistry, RNA, Untranslated metabolism, Actinobacteria genetics, Evolution, Molecular, Mycobacterium genetics, Mycobacterium tuberculosis genetics
- Abstract
Background: The sequence of the pathogen Mycobacterium tuberculosis (Mtb) strain H37Rv has been available for over a decade, but the biology of the pathogen remains poorly understood. Genome sequences from other Mtb strains and closely related bacteria present an opportunity to apply the power of comparative genomics to understand the evolution of Mtb pathogenesis. We conducted a comparative analysis using 31 genomes from the Tuberculosis Database (TBDB.org), including 8 strains of Mtb and M. bovis, 11 additional Mycobacteria, 4 Corynebacteria, 2 Streptomyces, Rhodococcus jostii RHA1, Nocardia farcinia, Acidothermus cellulolyticus, Rhodobacter sphaeroides, Propionibacterium acnes, and Bifidobacterium longum., Results: Our results highlight the functional importance of lipid metabolism and its regulation, and reveal variation between the evolutionary profiles of genes implicated in saturated and unsaturated fatty acid metabolism. It also suggests that DNA repair and molybdopterin cofactors are important in pathogenic Mycobacteria. By analyzing sequence conservation and gene expression data, we identify nearly 400 conserved noncoding regions. These include 37 predicted promoter regulatory motifs, of which 14 correspond to previously validated motifs, as well as 50 potential noncoding RNAs, of which we experimentally confirm the expression of four., Conclusions: Our analysis of protein evolution highlights gene families that are associated with the adaptation of environmental Mycobacteria to obligate pathogenesis. These families include fatty acid metabolism, DNA repair, and molybdopterin biosynthesis. Our analysis reinforces recent findings suggesting that small noncoding RNAs are more common in Mycobacteria than previously expected. Our data provide a foundation for understanding the genome and biology of Mtb in a comparative context, and are available online and through TBDB.org.
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- 2012
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29. GenomeView: a next-generation genome browser.
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Abeel T, Van Parys T, Saeys Y, Galagan J, and Van de Peer Y
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- Molecular Sequence Annotation, Sequence Analysis, DNA, Sequence Analysis, RNA, Systems Integration, User-Computer Interface, Genomics methods, High-Throughput Nucleotide Sequencing, Sequence Alignment methods, Software
- Abstract
Due to ongoing advances in sequencing technologies, billions of nucleotide sequences are now produced on a daily basis. A major challenge is to visualize these data for further downstream analysis. To this end, we present GenomeView, a stand-alone genome browser specifically designed to visualize and manipulate a multitude of genomics data. GenomeView enables users to dynamically browse high volumes of aligned short-read data, with dynamic navigation and semantic zooming, from the whole genome level to the single nucleotide. At the same time, the tool enables visualization of whole genome alignments of dozens of genomes relative to a reference sequence. GenomeView is unique in its capability to interactively handle huge data sets consisting of tens of aligned genomes, thousands of annotation features and millions of mapped short reads both as viewer and editor. GenomeView is freely available as an open source software package.
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- 2012
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30. Independent large scale duplications in multiple M. tuberculosis lineages overlapping the same genomic region.
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Weiner B, Gomez J, Victor TC, Warren RM, Sloutsky A, Plikaytis BB, Posey JE, van Helden PD, Gey van Pittius NC, Koehrsen M, Sisk P, Stolte C, White J, Gagneux S, Birren B, Hung D, Murray M, and Galagan J
- Subjects
- Drug Resistance, Bacterial, Gene Duplication, Genetic Variation, Genome, Bacterial, Mycobacterium tuberculosis genetics
- Abstract
Mycobacterium tuberculosis, the causative agent of most human tuberculosis, infects one third of the world's population and kills an estimated 1.7 million people a year. With the world-wide emergence of drug resistance, and the finding of more functional genetic diversity than previously expected, there is a renewed interest in understanding the forces driving genome evolution of this important pathogen. Genetic diversity in M. tuberculosis is dominated by single nucleotide polymorphisms and small scale gene deletion, with little or no evidence for large scale genome rearrangements seen in other bacteria. Recently, a single report described a large scale genome duplication that was suggested to be specific to the Beijing lineage. We report here multiple independent large-scale duplications of the same genomic region of M. tuberculosis detected through whole-genome sequencing. The duplications occur in strains belonging to both M. tuberculosis lineage 2 and 4, and are thus not limited to Beijing strains. The duplications occur in both drug-resistant and drug susceptible strains. The duplicated regions also have substantially different boundaries in different strains, indicating different originating duplication events. We further identify a smaller segmental duplication of a different genomic region of a lab strain of H37Rv. The presence of multiple independent duplications of the same genomic region suggests either instability in this region, a selective advantage conferred by the duplication, or both. The identified duplications suggest that large-scale gene duplication may be more common in M. tuberculosis than previously considered.
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- 2012
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31. Whole-genome sequencing of rifampicin-resistant Mycobacterium tuberculosis strains identifies compensatory mutations in RNA polymerase genes.
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Comas I, Borrell S, Roetzer A, Rose G, Malla B, Kato-Maeda M, Galagan J, Niemann S, and Gagneux S
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- Genome, Bacterial, Models, Molecular, Mutation, Mycobacterium tuberculosis drug effects, Sequence Analysis, DNA, Tuberculosis, Multidrug-Resistant epidemiology, Tuberculosis, Multidrug-Resistant microbiology, DNA-Directed RNA Polymerases genetics, Drug Resistance, Bacterial genetics, Mycobacterium tuberculosis genetics, Rifampin pharmacology, Tuberculosis, Multidrug-Resistant genetics
- Abstract
Epidemics of drug-resistant bacteria emerge worldwide, even as resistant strains frequently have reduced fitness compared to their drug-susceptible counterparts. Data from model systems suggest that the fitness cost of antimicrobial resistance can be reduced by compensatory mutations; however, there is limited evidence that compensatory evolution has any significant role in the success of drug-resistant bacteria in human populations. Here we describe a set of compensatory mutations in the RNA polymerase genes of rifampicin-resistant M. tuberculosis, the etiologic agent of human tuberculosis (TB). M. tuberculosis strains harboring these compensatory mutations showed a high competitive fitness in vitro. Moreover, these mutations were associated with high fitness in vivo, as determined by examining their relative clinical frequency across patient populations. Of note, in countries with the world's highest incidence of multidrug-resistant (MDR) TB, more than 30% of MDR clinical isolates had this form of mutation. Our findings support a role for compensatory evolution in the global epidemics of MDR TB.
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- 2011
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32. Comparative genomics yields insights into niche adaptation of plant vascular wilt pathogens.
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Klosterman SJ, Subbarao KV, Kang S, Veronese P, Gold SE, Thomma BP, Chen Z, Henrissat B, Lee YH, Park J, Garcia-Pedrajas MD, Barbara DJ, Anchieta A, de Jonge R, Santhanam P, Maruthachalam K, Atallah Z, Amyotte SG, Paz Z, Inderbitzin P, Hayes RJ, Heiman DI, Young S, Zeng Q, Engels R, Galagan J, Cuomo CA, Dobinson KF, and Ma LJ
- Subjects
- Genomics, Nicotiana genetics, Adaptation, Physiological genetics, Genome, Fungal physiology, Plant Diseases genetics, Plant Diseases microbiology, Nicotiana microbiology, Verticillium genetics, Verticillium pathogenicity
- Abstract
The vascular wilt fungi Verticillium dahliae and V. albo-atrum infect over 200 plant species, causing billions of dollars in annual crop losses. The characteristic wilt symptoms are a result of colonization and proliferation of the pathogens in the xylem vessels, which undergo fluctuations in osmolarity. To gain insights into the mechanisms that confer the organisms' pathogenicity and enable them to proliferate in the unique ecological niche of the plant vascular system, we sequenced the genomes of V. dahliae and V. albo-atrum and compared them to each other, and to the genome of Fusarium oxysporum, another fungal wilt pathogen. Our analyses identified a set of proteins that are shared among all three wilt pathogens, and present in few other fungal species. One of these is a homolog of a bacterial glucosyltransferase that synthesizes virulence-related osmoregulated periplasmic glucans in bacteria. Pathogenicity tests of the corresponding V. dahliae glucosyltransferase gene deletion mutants indicate that the gene is required for full virulence in the Australian tobacco species Nicotiana benthamiana. Compared to other fungi, the two sequenced Verticillium genomes encode more pectin-degrading enzymes and other carbohydrate-active enzymes, suggesting an extraordinary capacity to degrade plant pectin barricades. The high level of synteny between the two Verticillium assemblies highlighted four flexible genomic islands in V. dahliae that are enriched for transposable elements, and contain duplicated genes and genes that are important in signaling/transcriptional regulation and iron/lipid metabolism. Coupled with an enhanced capacity to degrade plant materials, these genomic islands may contribute to the expanded genetic diversity and virulence of V. dahliae, the primary causal agent of Verticillium wilts. Significantly, our study reveals insights into the genetic mechanisms of niche adaptation of fungal wilt pathogens, advances our understanding of the evolution and development of their pathogenesis, and sheds light on potential avenues for the development of novel disease management strategies to combat destructive wilt diseases.
- Published
- 2011
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33. Use of whole genome sequencing to estimate the mutation rate of Mycobacterium tuberculosis during latent infection.
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Ford CB, Lin PL, Chase MR, Shah RR, Iartchouk O, Galagan J, Mohaideen N, Ioerger TR, Sacchettini JC, Lipsitch M, Flynn JL, and Fortune SM
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- Animals, Antitubercular Agents pharmacology, Base Sequence, DNA, Bacterial genetics, Disease Models, Animal, Drug Resistance, Bacterial genetics, Humans, Isoniazid pharmacology, Latent Tuberculosis drug therapy, Macaca fascicularis, Models, Genetic, Mycobacterium tuberculosis drug effects, Mycobacterium tuberculosis isolation & purification, Mycobacterium tuberculosis pathogenicity, Polymorphism, Single Nucleotide, Time Factors, Tuberculosis, Multidrug-Resistant drug therapy, Tuberculosis, Multidrug-Resistant microbiology, Genome, Bacterial, Latent Tuberculosis microbiology, Mutation, Mycobacterium tuberculosis genetics
- Abstract
Tuberculosis poses a global health emergency, which has been compounded by the emergence of drug-resistant Mycobacterium tuberculosis (Mtb) strains. We used whole-genome sequencing to compare the accumulation of mutations in Mtb isolated from cynomolgus macaques with active, latent or reactivated disease. We sequenced 33 Mtb isolates from nine macaques with an average genome coverage of 93% and an average read depth of 117×. Based on the distribution of SNPs observed, we calculated the mutation rates for these disease states. We found a similar mutation rate during latency as during active disease or in a logarithmically growing culture over the same period of time. The pattern of polymorphisms suggests that the mutational burden in vivo is because of oxidative DNA damage. We show that Mtb continues to acquire mutations during disease latency, which may explain why isoniazid monotherapy for latent tuberculosis is a risk factor for the emergence of isoniazid resistance.
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- 2011
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34. A systems biology approach to infectious disease research: innovating the pathogen-host research paradigm.
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Aderem A, Adkins JN, Ansong C, Galagan J, Kaiser S, Korth MJ, Law GL, McDermott JG, Proll SC, Rosenberger C, Schoolnik G, and Katze MG
- Subjects
- Humans, Communicable Diseases genetics, Communicable Diseases immunology, Communicable Diseases metabolism, Host-Pathogen Interactions, Systems Biology methods
- Abstract
The twentieth century was marked by extraordinary advances in our understanding of microbes and infectious disease, but pandemics remain, food and waterborne illnesses are frequent, multidrug-resistant microbes are on the rise, and the needed drugs and vaccines have not been developed. The scientific approaches of the past-including the intense focus on individual genes and proteins typical of molecular biology-have not been sufficient to address these challenges. The first decade of the twenty-first century has seen remarkable innovations in technology and computational methods. These new tools provide nearly comprehensive views of complex biological systems and can provide a correspondingly deeper understanding of pathogen-host interactions. To take full advantage of these innovations, the National Institute of Allergy and Infectious Diseases recently initiated the Systems Biology Program for Infectious Disease Research. As participants of the Systems Biology Program, we think that the time is at hand to redefine the pathogen-host research paradigm., (Copyright © 2011 Aderem et al.)
- Published
- 2011
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35. Genome variation in Cryptococcus gattii, an emerging pathogen of immunocompetent hosts.
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D'Souza CA, Kronstad JW, Taylor G, Warren R, Yuen M, Hu G, Jung WH, Sham A, Kidd SE, Tangen K, Lee N, Zeilmaker T, Sawkins J, McVicker G, Shah S, Gnerre S, Griggs A, Zeng Q, Bartlett K, Li W, Wang X, Heitman J, Stajich JE, Fraser JA, Meyer W, Carter D, Schein J, Krzywinski M, Kwon-Chung KJ, Varma A, Wang J, Brunham R, Fyfe M, Ouellette BF, Siddiqui A, Marra M, Jones S, Holt R, Birren BW, Galagan JE, and Cuomo CA
- Subjects
- Animals, Antifungal Agents pharmacology, Cryptococcus gattii classification, Cryptococcus gattii drug effects, Cryptococcus gattii isolation & purification, Disease Outbreaks, Evolution, Molecular, Female, Genotype, Host-Pathogen Interactions, Humans, Mice, Mice, Inbred C57BL, Molecular Sequence Data, North America epidemiology, Phylogeny, Cryptococcosis immunology, Cryptococcosis microbiology, Cryptococcus gattii genetics, Genetic Variation, Genome, Bacterial
- Abstract
Cryptococcus gattii recently emerged as the causative agent of cryptococcosis in healthy individuals in western North America, despite previous characterization of the fungus as a pathogen in tropical or subtropical regions. As a foundation to study the genetics of virulence in this pathogen, we sequenced the genomes of a strain (WM276) representing the predominant global molecular type (VGI) and a clinical strain (R265) of the major genotype (VGIIa) causing disease in North America. We compared these C. gattii genomes with each other and with the genomes of representative strains of the two varieties of Cryptococcus neoformans that generally cause disease in immunocompromised people. Our comparisons included chromosome alignments, analysis of gene content and gene family evolution, and comparative genome hybridization (CGH). These studies revealed that the genomes of the two representative C. gattii strains (genotypes VGI and VGIIa) are colinear for the majority of chromosomes, with some minor rearrangements. However, multiortholog phylogenetic analysis and an evaluation of gene/sequence conservation support the existence of speciation within the C. gattii complex. More extensive chromosome rearrangements were observed upon comparison of the C. gattii and the C. neoformans genomes. Finally, CGH revealed considerable variation in clinical and environmental isolates as well as changes in chromosome copy numbers in C. gattii isolates displaying fluconazole heteroresistance., (Copyright © 2011 D’Souza et al.)
- Published
- 2011
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36. Human T cell epitopes of Mycobacterium tuberculosis are evolutionarily hyperconserved.
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Comas I, Chakravartti J, Small PM, Galagan J, Niemann S, Kremer K, Ernst JD, and Gagneux S
- Subjects
- Antigens, Bacterial genetics, Genome, Bacterial, Humans, Phylogeny, Sequence Analysis, DNA, T-Lymphocytes immunology, Conserved Sequence, Epitopes, T-Lymphocyte, Evolution, Molecular, Mycobacterium tuberculosis genetics
- Abstract
Mycobacterium tuberculosis is an obligate human pathogen capable of persisting in individual hosts for decades. We sequenced the genomes of 21 strains representative of the global diversity and six major lineages of the M. tuberculosis complex (MTBC) at 40- to 90-fold coverage using Illumina next-generation DNA sequencing. We constructed a genome-wide phylogeny based on these genome sequences. Comparative analyses of the sequences showed, as expected, that essential genes in MTBC were more evolutionarily conserved than nonessential genes. Notably, however, most of the 491 experimentally confirmed human T cell epitopes showed little sequence variation and had a lower ratio of nonsynonymous to synonymous changes than seen in essential and nonessential genes. We confirmed these findings in an additional data set consisting of 16 antigens in 99 MTBC strains. These findings are consistent with strong purifying selection acting on these epitopes, implying that MTBC might benefit from recognition by human T cells.
- Published
- 2010
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37. Comparative genomics reveals mobile pathogenicity chromosomes in Fusarium.
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Ma LJ, van der Does HC, Borkovich KA, Coleman JJ, Daboussi MJ, Di Pietro A, Dufresne M, Freitag M, Grabherr M, Henrissat B, Houterman PM, Kang S, Shim WB, Woloshuk C, Xie X, Xu JR, Antoniw J, Baker SE, Bluhm BH, Breakspear A, Brown DW, Butchko RA, Chapman S, Coulson R, Coutinho PM, Danchin EG, Diener A, Gale LR, Gardiner DM, Goff S, Hammond-Kosack KE, Hilburn K, Hua-Van A, Jonkers W, Kazan K, Kodira CD, Koehrsen M, Kumar L, Lee YH, Li L, Manners JM, Miranda-Saavedra D, Mukherjee M, Park G, Park J, Park SY, Proctor RH, Regev A, Ruiz-Roldan MC, Sain D, Sakthikumar S, Sykes S, Schwartz DC, Turgeon BG, Wapinski I, Yoder O, Young S, Zeng Q, Zhou S, Galagan J, Cuomo CA, Kistler HC, and Rep M
- Subjects
- Evolution, Molecular, Fusarium classification, Host-Parasite Interactions genetics, Multigene Family genetics, Phenotype, Phylogeny, Proteome genetics, Sequence Analysis, DNA, Synteny genetics, Virulence genetics, Chromosomes, Fungal genetics, Fusarium genetics, Fusarium pathogenicity, Genome, Fungal genetics, Genomics
- Abstract
Fusarium species are among the most important phytopathogenic and toxigenic fungi. To understand the molecular underpinnings of pathogenicity in the genus Fusarium, we compared the genomes of three phenotypically diverse species: Fusarium graminearum, Fusarium verticillioides and Fusarium oxysporum f. sp. lycopersici. Our analysis revealed lineage-specific (LS) genomic regions in F. oxysporum that include four entire chromosomes and account for more than one-quarter of the genome. LS regions are rich in transposons and genes with distinct evolutionary profiles but related to pathogenicity, indicative of horizontal acquisition. Experimentally, we demonstrate the transfer of two LS chromosomes between strains of F. oxysporum, converting a non-pathogenic strain into a pathogen. Transfer of LS chromosomes between otherwise genetically isolated strains explains the polyphyletic origin of host specificity and the emergence of new pathogenic lineages in F. oxysporum. These findings put the evolution of fungal pathogenicity into a new perspective.
- Published
- 2010
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38. Genomic analysis of the basal lineage fungus Rhizopus oryzae reveals a whole-genome duplication.
- Author
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Ma LJ, Ibrahim AS, Skory C, Grabherr MG, Burger G, Butler M, Elias M, Idnurm A, Lang BF, Sone T, Abe A, Calvo SE, Corrochano LM, Engels R, Fu J, Hansberg W, Kim JM, Kodira CD, Koehrsen MJ, Liu B, Miranda-Saavedra D, O'Leary S, Ortiz-Castellanos L, Poulter R, Rodriguez-Romero J, Ruiz-Herrera J, Shen YQ, Zeng Q, Galagan J, Birren BW, Cuomo CA, and Wickes BL
- Subjects
- DNA Transposable Elements, Fungal Proteins genetics, Fungi classification, Fungi genetics, Humans, Phylogeny, Rhizopus chemistry, Rhizopus classification, Rhizopus isolation & purification, Gene Duplication, Genome, Fungal, Genomics, Mucormycosis microbiology, Rhizopus genetics
- Abstract
Rhizopus oryzae is the primary cause of mucormycosis, an emerging, life-threatening infection characterized by rapid angioinvasive growth with an overall mortality rate that exceeds 50%. As a representative of the paraphyletic basal group of the fungal kingdom called "zygomycetes," R. oryzae is also used as a model to study fungal evolution. Here we report the genome sequence of R. oryzae strain 99-880, isolated from a fatal case of mucormycosis. The highly repetitive 45.3 Mb genome assembly contains abundant transposable elements (TEs), comprising approximately 20% of the genome. We predicted 13,895 protein-coding genes not overlapping TEs, many of which are paralogous gene pairs. The order and genomic arrangement of the duplicated gene pairs and their common phylogenetic origin provide evidence for an ancestral whole-genome duplication (WGD) event. The WGD resulted in the duplication of nearly all subunits of the protein complexes associated with respiratory electron transport chains, the V-ATPase, and the ubiquitin-proteasome systems. The WGD, together with recent gene duplications, resulted in the expansion of multiple gene families related to cell growth and signal transduction, as well as secreted aspartic protease and subtilase protein families, which are known fungal virulence factors. The duplication of the ergosterol biosynthetic pathway, especially the major azole target, lanosterol 14alpha-demethylase (ERG11), could contribute to the variable responses of R. oryzae to different azole drugs, including voriconazole and posaconazole. Expanded families of cell-wall synthesis enzymes, essential for fungal cell integrity but absent in mammalian hosts, reveal potential targets for novel and R. oryzae-specific diagnostic and therapeutic treatments., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2009
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39. Pneumococcal capsular polysaccharide structure predicts serotype prevalence.
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Weinberger DM, Trzciński K, Lu YJ, Bogaert D, Brandes A, Galagan J, Anderson PW, Malley R, and Lipsitch M
- Subjects
- Animals, Bacterial Capsules genetics, Fructose metabolism, Glucose metabolism, Humans, Linear Models, Mice, Mice, Inbred C57BL, Neutrophils immunology, Pneumococcal Infections epidemiology, Pneumococcal Infections immunology, Pneumococcal Vaccines immunology, Prevalence, Serotyping, Statistics, Nonparametric, Streptococcus pneumoniae genetics, Streptococcus pneumoniae pathogenicity, Bacterial Capsules chemistry, Carrier State immunology, Carrier State microbiology, Pneumococcal Infections microbiology, Streptococcus pneumoniae classification, Streptococcus pneumoniae immunology
- Abstract
There are 91 known capsular serotypes of Streptococcus pneumoniae. The nasopharyngeal carriage prevalence of particular serotypes is relatively stable worldwide, but the host and bacterial factors that maintain these patterns are poorly understood. Given the possibility of serotype replacement following vaccination against seven clinically important serotypes, it is increasingly important to understand these factors. We hypothesized that the biochemical structure of the capsular polysaccharides could influence the degree of encapsulation of different serotypes, their susceptibility to killing by neutrophils, and ultimately their success during nasopharyngeal carriage. We sought to measure biological differences among capsular serotypes that may account for epidemiological patterns. Using an in vitro assay with both isogenic capsule-switch variants and clinical carriage isolates, we found an association between increased carriage prevalence and resistance to non-opsonic neutrophil-mediated killing, and serotypes that were resistant to neutrophil-mediated killing tended to be more heavily encapsulated, as determined by FITC-dextran exclusion. Next, we identified a link between polysaccharide structure and carriage prevalence. Significantly, non-vaccine serotypes that have become common in vaccinated populations tend to be those with fewer carbons per repeat unit and low energy expended per repeat unit, suggesting a novel biological principle to explain patterns of serotype replacement. More prevalent serotypes are more heavily encapsulated and more resistant to neutrophil-mediated killing, and these phenotypes are associated with the structure of the capsular polysaccharide, suggesting a direct relationship between polysaccharide biochemistry and the success of a serotype during nasopharyngeal carriage and potentially providing a method for predicting serotype replacement.
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- 2009
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40. Comparative genomic characterization of Francisella tularensis strains belonging to low and high virulence subspecies.
- Author
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Champion MD, Zeng Q, Nix EB, Nano FE, Keim P, Kodira CD, Borowsky M, Young S, Koehrsen M, Engels R, Pearson M, Howarth C, Larson L, White J, Alvarado L, Forsman M, Bearden SW, Sjöstedt A, Titball R, Michell SL, Birren B, and Galagan J
- Subjects
- Base Sequence, Francisella tularensis isolation & purification, Genes, Bacterial genetics, Phylogeny, Recombination, Genetic, Virulence genetics, Comparative Genomic Hybridization, Francisella tularensis genetics, Francisella tularensis pathogenicity
- Abstract
Tularemia is a geographically widespread, severely debilitating, and occasionally lethal disease in humans. It is caused by infection by a gram-negative bacterium, Francisella tularensis. In order to better understand its potency as an etiological agent as well as its potential as a biological weapon, we have completed draft assemblies and report the first complete genomic characterization of five strains belonging to the following different Francisella subspecies (subsp.): the F. tularensis subsp. tularensis FSC033, F. tularensis subsp. holarctica FSC257 and FSC022, and F. tularensis subsp. novicida GA99-3548 and GA99-3549 strains. Here, we report the sequencing of these strains and comparative genomic analysis with recently available public Francisella sequences, including the rare F. tularensis subsp. mediasiatica FSC147 strain isolate from the Central Asian Region. We report evidence for the occurrence of large-scale rearrangement events in strains of the holarctica subspecies, supporting previous proposals that further phylogenetic subdivisions of the Type B clade are likely. We also find a significant enrichment of disrupted or absent ORFs proximal to predicted breakpoints in the FSC022 strain, including a genetic component of the Type I restriction-modification defense system. Many of the pseudogenes identified are also disrupted in the closely related rarely human pathogenic F. tularensis subsp. mediasiatica FSC147 strain, including modulator of drug activity B (mdaB) (FTT0961), which encodes a known NADPH quinone reductase involved in oxidative stress resistance. We have also identified genes exhibiting sequence similarity to effectors of the Type III (T3SS) and components of the Type IV secretion systems (T4SS). One of the genes, msrA2 (FTT1797c), is disrupted in F. tularensis subsp. mediasiatica and has recently been shown to mediate bacterial pathogen survival in host organisms. Our findings suggest that in addition to the duplication of the Francisella Pathogenicity Island, and acquisition of individual loci, adaptation by gene loss in the more recently emerged tularensis, holarctica, and mediasiatica subspecies occurred and was distinct from evolutionary events that differentiated these subspecies, and the novicida subspecies, from a common ancestor. Our findings are applicable to future studies focused on variations in Francisella subspecies pathogenesis, and of broader interest to studies of genomic pathoadaptation in bacteria.
- Published
- 2009
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41. Evolutionary roles of upstream open reading frames in mediating gene regulation in fungi.
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Hood HM, Neafsey DE, Galagan J, and Sachs MS
- Subjects
- Aspergillus genetics, Cryptococcus genetics, Gene Expression Regulation, Fungal, Models, Biological, Neurospora crassa genetics, Saccharomyces cerevisiae genetics, Genes, Fungal, Neurospora crassa physiology, Open Reading Frames, Protein Biosynthesis, Saccharomyces cerevisiae physiology
- Abstract
Upstream open reading frames (uORFs) are frequently present in the 5'-leader regions of fungal mRNAs. They can affect translation by controlling the ability of ribosomes that scan from the mRNA 5' end to reach the downstream genic reading frame. The translation of uORFs can also affect mRNA stability. For several genes, including Saccharomyces cerevisiae GCN4, S. cerevisiae CPA1, and Neurospora crassa arg-2, regulation by uORFs controls expression in response to specific physiological signals. The roles of many uORFs that are identified by genome-level approaches, as have been initiated for Saccharomyces, Aspergillus, and Cryptococcus species, remain to be determined. Some uORFs may have regulatory roles, while others may exist to insulate the genic reading frame from the negative impacts of upstream translation start sites in the mRNA 5' leader.
- Published
- 2009
- Full Text
- View/download PDF
42. Genome sequence of Aedes aegypti, a major arbovirus vector.
- Author
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Nene V, Wortman JR, Lawson D, Haas B, Kodira C, Tu ZJ, Loftus B, Xi Z, Megy K, Grabherr M, Ren Q, Zdobnov EM, Lobo NF, Campbell KS, Brown SE, Bonaldo MF, Zhu J, Sinkins SP, Hogenkamp DG, Amedeo P, Arensburger P, Atkinson PW, Bidwell S, Biedler J, Birney E, Bruggner RV, Costas J, Coy MR, Crabtree J, Crawford M, Debruyn B, Decaprio D, Eiglmeier K, Eisenstadt E, El-Dorry H, Gelbart WM, Gomes SL, Hammond M, Hannick LI, Hogan JR, Holmes MH, Jaffe D, Johnston JS, Kennedy RC, Koo H, Kravitz S, Kriventseva EV, Kulp D, Labutti K, Lee E, Li S, Lovin DD, Mao C, Mauceli E, Menck CF, Miller JR, Montgomery P, Mori A, Nascimento AL, Naveira HF, Nusbaum C, O'leary S, Orvis J, Pertea M, Quesneville H, Reidenbach KR, Rogers YH, Roth CW, Schneider JR, Schatz M, Shumway M, Stanke M, Stinson EO, Tubio JM, Vanzee JP, Verjovski-Almeida S, Werner D, White O, Wyder S, Zeng Q, Zhao Q, Zhao Y, Hill CA, Raikhel AS, Soares MB, Knudson DL, Lee NH, Galagan J, Salzberg SL, Paulsen IT, Dimopoulos G, Collins FH, Birren B, Fraser-Liggett CM, and Severson DW
- Subjects
- Aedes metabolism, Animals, Anopheles genetics, Anopheles metabolism, Arboviruses, Base Sequence, DNA Transposable Elements, Dengue prevention & control, Dengue transmission, Drosophila melanogaster genetics, Female, Genes, Insect, Humans, Insect Proteins genetics, Insect Vectors metabolism, Male, Membrane Transport Proteins genetics, Molecular Sequence Data, Multigene Family, Protein Structure, Tertiary genetics, Sequence Analysis, DNA, Sex Characteristics, Sex Determination Processes, Species Specificity, Synteny, Transcription, Genetic, Yellow Fever prevention & control, Yellow Fever transmission, Aedes genetics, Genome, Insect, Insect Vectors genetics
- Abstract
We present a draft sequence of the genome of Aedes aegypti, the primary vector for yellow fever and dengue fever, which at approximately 1376 million base pairs is about 5 times the size of the genome of the malaria vector Anopheles gambiae. Nearly 50% of the Ae. aegypti genome consists of transposable elements. These contribute to a factor of approximately 4 to 6 increase in average gene length and in sizes of intergenic regions relative to An. gambiae and Drosophila melanogaster. Nonetheless, chromosomal synteny is generally maintained among all three insects, although conservation of orthologous gene order is higher (by a factor of approximately 2) between the mosquito species than between either of them and the fruit fly. An increase in genes encoding odorant binding, cytochrome P450, and cuticle domains relative to An. gambiae suggests that members of these protein families underpin some of the biological differences between the two mosquito species.
- Published
- 2007
- Full Text
- View/download PDF
43. Insights from the genome of the biotrophic fungal plant pathogen Ustilago maydis.
- Author
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Kämper J, Kahmann R, Bölker M, Ma LJ, Brefort T, Saville BJ, Banuett F, Kronstad JW, Gold SE, Müller O, Perlin MH, Wösten HA, de Vries R, Ruiz-Herrera J, Reynaga-Peña CG, Snetselaar K, McCann M, Pérez-Martín J, Feldbrügge M, Basse CW, Steinberg G, Ibeas JI, Holloman W, Guzman P, Farman M, Stajich JE, Sentandreu R, González-Prieto JM, Kennell JC, Molina L, Schirawski J, Mendoza-Mendoza A, Greilinger D, Münch K, Rössel N, Scherer M, Vranes M, Ladendorf O, Vincon V, Fuchs U, Sandrock B, Meng S, Ho EC, Cahill MJ, Boyce KJ, Klose J, Klosterman SJ, Deelstra HJ, Ortiz-Castellanos L, Li W, Sanchez-Alonso P, Schreier PH, Häuser-Hahn I, Vaupel M, Koopmann E, Friedrich G, Voss H, Schlüter T, Margolis J, Platt D, Swimmer C, Gnirke A, Chen F, Vysotskaia V, Mannhaupt G, Güldener U, Münsterkötter M, Haase D, Oesterheld M, Mewes HW, Mauceli EW, DeCaprio D, Wade CM, Butler J, Young S, Jaffe DB, Calvo S, Nusbaum C, Galagan J, and Birren BW
- Subjects
- Fungal Proteins genetics, Fungal Proteins metabolism, Gene Expression Profiling, Gene Expression Regulation, Fungal, Genes, Fungal genetics, Genomics, Multigene Family genetics, Ustilago growth & development, Virulence genetics, Genome, Fungal genetics, Ustilago genetics, Ustilago pathogenicity, Zea mays microbiology
- Abstract
Ustilago maydis is a ubiquitous pathogen of maize and a well-established model organism for the study of plant-microbe interactions. This basidiomycete fungus does not use aggressive virulence strategies to kill its host. U. maydis belongs to the group of biotrophic parasites (the smuts) that depend on living tissue for proliferation and development. Here we report the genome sequence for a member of this economically important group of biotrophic fungi. The 20.5-million-base U. maydis genome assembly contains 6,902 predicted protein-encoding genes and lacks pathogenicity signatures found in the genomes of aggressive pathogenic fungi, for example a battery of cell-wall-degrading enzymes. However, we detected unexpected genomic features responsible for the pathogenicity of this organism. Specifically, we found 12 clusters of genes encoding small secreted proteins with unknown function. A significant fraction of these genes exists in small gene families. Expression analysis showed that most of the genes contained in these clusters are regulated together and induced in infected tissue. Deletion of individual clusters altered the virulence of U. maydis in five cases, ranging from a complete lack of symptoms to hypervirulence. Despite years of research into the mechanism of pathogenicity in U. maydis, no 'true' virulence factors had been previously identified. Thus, the discovery of the secreted protein gene clusters and the functional demonstration of their decisive role in the infection process illuminate previously unknown mechanisms of pathogenicity operating in biotrophic fungi. Genomic analysis is, similarly, likely to open up new avenues for the discovery of virulence determinants in other pathogens.
- Published
- 2006
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- View/download PDF
44. Promoter strength and tissue specificity effects on growth of tomato plants transformed with maize sucrose-phosphate synthase.
- Author
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Laporte MM, Galagan JA, Prasch AL, Vanderveer PJ, Hanson DT, Shewmaker CK, and Sharkey TD
- Subjects
- Amino Acids biosynthesis, Gene Dosage, Gene Expression Regulation, Plant, Glucosyltransferases genetics, Solanum lycopersicum genetics, Solanum lycopersicum growth & development, Oxygen metabolism, Photosynthesis, Plant Leaves growth & development, Plant Roots enzymology, Plant Roots growth & development, Plants, Genetically Modified, Ribulose-Bisphosphate Carboxylase metabolism, Starch analysis, Sucrose analysis, Transgenes, Transplantation, Zea mays enzymology, Zea mays genetics, Glucosyltransferases metabolism, Solanum lycopersicum enzymology, Promoter Regions, Genetic
- Abstract
When sucrose-phosphate synthase (SPS; EC 2.4.1.14) is expressed in tomato (Lycopersicon esculentum Mill.) from a ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) small subunit (rbcS) promoter, yields are often unchanged but when SPS is expressed from a Cauliflower Mosaic Virus 35S promoter, yield is enhanced up to 80%. Two explanations for this phenomenon are (i) that expression of SPS in tissues other than leaves accounts for the increased yield or (ii) that the lower level of expression directed by the 35S promoter is more beneficial than the high level of expression directed by the rbcS promoter. To test the first hypothesis, we conducted a reciprocal graft experiment, which showed that root SPS activity did not substantially affect growth. To test the second hypothesis, we conducted a field trial using a backcrossed, segregating, population of SPS-transformed plants derived from 35S and rbcS lines. The optimal dose of SPS activity for growth was approximately twice that of the wild type regardless of which promoter was used. The effect of SPS on growth was the result of a shift in partitioning of carbon among starch, sucrose, and ionic compounds (primarily amino acids), rather than of an increase in net photosynthesis. Excessive SPS activity resulted in a decreased rate of amino acid synthesis, which could explain the non-linear response of plant growth to the level of SPS expression.
- Published
- 2001
- Full Text
- View/download PDF
45. Modulation and vectorial summation of the spinalized frog's hindlimb end-point force produced by intraspinal electrical stimulation of the cord.
- Author
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Lemay MA, Galagan JE, Hogan N, and Bizzi E
- Subjects
- Animals, Biomechanical Phenomena, Disease Models, Animal, Electric Stimulation, Electromyography, Muscle, Skeletal physiopathology, Neuromuscular Diseases physiopathology, Rana catesbeiana, Hindlimb physiopathology, Spinal Cord physiopathology, Spinal Cord Injuries physiopathology
- Abstract
The ability to produce various force patterns at the ankle by microstimulation of the gray matter of the spinal cord was investigated in spinalized frogs. We evaluated the recruitment properties of individual spinal sites and found that forces increase linearly with activation level in the low-force range studied, while the structure of the force pattern remains invariant. We also measured the responses produced by coactivation of two spinal sites activated at two pairs of stimulation levels. Responses were measured at the mechanical level by recording forces at the ankle; and, at the muscular level by recording the electromyographic (EMG) activity of 11 hindlimb muscles. We found that for both pairs of activation, the forces under coactivation were the scaled vectorial summation of the individual responses. At the muscular level, rectified and integrated EMGs also summated during coactivation. Numerous force patterns could, thus, be created by the activation of a few individual sites. These results suggest that microstimulation of the circuitry of the spinal cord (higher order neurons than the motoneurons) holds promise as a new functional neuromuscular stimulation (FNS) technique for the restoration of multi-joint movements.
- Published
- 2001
- Full Text
- View/download PDF
46. Initial sequencing and analysis of the human genome.
- Author
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Lander ES, Linton LM, Birren B, Nusbaum C, Zody MC, Baldwin J, Devon K, Dewar K, Doyle M, FitzHugh W, Funke R, Gage D, Harris K, Heaford A, Howland J, Kann L, Lehoczky J, LeVine R, McEwan P, McKernan K, Meldrim J, Mesirov JP, Miranda C, Morris W, Naylor J, Raymond C, Rosetti M, Santos R, Sheridan A, Sougnez C, Stange-Thomann Y, Stojanovic N, Subramanian A, Wyman D, Rogers J, Sulston J, Ainscough R, Beck S, Bentley D, Burton J, Clee C, Carter N, Coulson A, Deadman R, Deloukas P, Dunham A, Dunham I, Durbin R, French L, Grafham D, Gregory S, Hubbard T, Humphray S, Hunt A, Jones M, Lloyd C, McMurray A, Matthews L, Mercer S, Milne S, Mullikin JC, Mungall A, Plumb R, Ross M, Shownkeen R, Sims S, Waterston RH, Wilson RK, Hillier LW, McPherson JD, Marra MA, Mardis ER, Fulton LA, Chinwalla AT, Pepin KH, Gish WR, Chissoe SL, Wendl MC, Delehaunty KD, Miner TL, Delehaunty A, Kramer JB, Cook LL, Fulton RS, Johnson DL, Minx PJ, Clifton SW, Hawkins T, Branscomb E, Predki P, Richardson P, Wenning S, Slezak T, Doggett N, Cheng JF, Olsen A, Lucas S, Elkin C, Uberbacher E, Frazier M, Gibbs RA, Muzny DM, Scherer SE, Bouck JB, Sodergren EJ, Worley KC, Rives CM, Gorrell JH, Metzker ML, Naylor SL, Kucherlapati RS, Nelson DL, Weinstock GM, Sakaki Y, Fujiyama A, Hattori M, Yada T, Toyoda A, Itoh T, Kawagoe C, Watanabe H, Totoki Y, Taylor T, Weissenbach J, Heilig R, Saurin W, Artiguenave F, Brottier P, Bruls T, Pelletier E, Robert C, Wincker P, Smith DR, Doucette-Stamm L, Rubenfield M, Weinstock K, Lee HM, Dubois J, Rosenthal A, Platzer M, Nyakatura G, Taudien S, Rump A, Yang H, Yu J, Wang J, Huang G, Gu J, Hood L, Rowen L, Madan A, Qin S, Davis RW, Federspiel NA, Abola AP, Proctor MJ, Myers RM, Schmutz J, Dickson M, Grimwood J, Cox DR, Olson MV, Kaul R, Raymond C, Shimizu N, Kawasaki K, Minoshima S, Evans GA, Athanasiou M, Schultz R, Roe BA, Chen F, Pan H, Ramser J, Lehrach H, Reinhardt R, McCombie WR, de la Bastide M, Dedhia N, Blöcker H, Hornischer K, Nordsiek G, Agarwala R, Aravind L, Bailey JA, Bateman A, Batzoglou S, Birney E, Bork P, Brown DG, Burge CB, Cerutti L, Chen HC, Church D, Clamp M, Copley RR, Doerks T, Eddy SR, Eichler EE, Furey TS, Galagan J, Gilbert JG, Harmon C, Hayashizaki Y, Haussler D, Hermjakob H, Hokamp K, Jang W, Johnson LS, Jones TA, Kasif S, Kaspryzk A, Kennedy S, Kent WJ, Kitts P, Koonin EV, Korf I, Kulp D, Lancet D, Lowe TM, McLysaght A, Mikkelsen T, Moran JV, Mulder N, Pollara VJ, Ponting CP, Schuler G, Schultz J, Slater G, Smit AF, Stupka E, Szustakowki J, Thierry-Mieg D, Thierry-Mieg J, Wagner L, Wallis J, Wheeler R, Williams A, Wolf YI, Wolfe KH, Yang SP, Yeh RF, Collins F, Guyer MS, Peterson J, Felsenfeld A, Wetterstrand KA, Patrinos A, Morgan MJ, de Jong P, Catanese JJ, Osoegawa K, Shizuya H, Choi S, Chen YJ, and Szustakowki J
- Subjects
- Animals, Chromosome Mapping, Conserved Sequence, CpG Islands, DNA Transposable Elements, Databases, Factual, Drug Industry, Evolution, Molecular, Forecasting, GC Rich Sequence, Gene Duplication, Genes, Genetic Diseases, Inborn, Genetics, Medical, Humans, Mutation, Private Sector, Proteins genetics, Proteome, Public Sector, RNA genetics, Repetitive Sequences, Nucleic Acid, Species Specificity, Genome, Human, Human Genome Project, Sequence Analysis, DNA methods
- Abstract
The human genome holds an extraordinary trove of information about human development, physiology, medicine and evolution. Here we report the results of an international collaboration to produce and make freely available a draft sequence of the human genome. We also present an initial analysis of the data, describing some of the insights that can be gleaned from the sequence.
- Published
- 2001
- Full Text
- View/download PDF
47. The Luke S. class action suit: a lesson in system change.
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Taylor JM, Tucker JA, and Galagan JE
- Subjects
- Child, Humans, Louisiana, Civil Rights legislation & jurisprudence, Education, Special, Referral and Consultation legislation & jurisprudence
- Published
- 1986
- Full Text
- View/download PDF
48. Psychoeducational testing: turn out the lights, the party's over.
- Author
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Galagan JE
- Subjects
- Child, Disabled Persons, Humans, Legislation as Topic, United States, Achievement, Curriculum, Education, Special, Educational Measurement, Psychological Tests
- Published
- 1985
- Full Text
- View/download PDF
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