Search

Your search keyword '"Zon, L.I."' showing total 37 results
Start Over Author "Zon, L.I."
37 results on '"Zon, L.I."'

9. 775 Hyperactivation of sympathetic nerves drives melanocyte stem cell depletion

Author

Zhang, B., primary, Ma, S., additional, Rachman, I., additional, He, M., additional, Baral, P., additional, Choi, S., additional, Gonçalves, W.A., additional, Shwartz, Y., additional, Fast, E.M., additional, Su, Y., additional, Zon, L.I., additional, Regev, A., additional, Buenrostro, J.D., additional, Cunha, T.M., additional, Chiu, I.M., additional, Fisher, D., additional, and Hsu, Y., additional

Published
2020
Full Text
View/download PDF

10. Cell cycle-dependent initiation and lineage-dependent abrogation of GATA-1 expression in pure differentiating hematopoietic progenitors

Author

Sposi, N.M., Zon, L.I., Care, A., Valtieri, M., Testa, U., Gabbianelli, M., Mariani, G., Bottero, L., Mather, C., Orkin, S.H., and Peschle, C.

Subjects
Hematopoietic growth factors -- Genetic aspects, Genetic transcription -- Regulation, Stem cells -- Genetic aspects, Science and technology
Abstract

An in vitro system consisting of a 'pure' population of early progenitors was used to study GATA-1 expression during normal hematopoiesis. It was shown that GATA-1 gene regulation involves complex mechanisms which activate, maintain and selectively abrogate expression. Hematopoietic growth factors stimulate the GATA-1 gene and initiate its entrance through the erythroid or granulocyte-macrophage pathway.

Published
1992

11. The complex cartography of stem cell commitment

Author

Akashi, K., Traver, D., and Zon, L.I.

Subjects
Erythrocytes -- Research, Tyrosine -- Research, Hematopoietic stem cells -- Research, Biological sciences
Abstract

A study conducted provides an insight into the early lineage commitment events of multipotent hematopoietic stem cells (HSCs). These studies show the importance of the Flt3 receptor tyrosine kinase as the earliest marker of hematopoietic cell fate commitment in the erythrocytes.

Published
2005

12. Genome-wide Trans-ethnic Meta-analysis Identifies Seven Genetic Loci Influencing Erythrocyte Traits and a Role for RBPMS in Erythropoiesis

Author

Rooij, F.J.A. (Frank) van, Qayyum, Q. (Rehan), Smith, A.V. (Albert Vernon), Zhou, Y. (Yi), Trompet, S. (Stella), Tanaka, T. (Toshiko), Keller, M.F. (Margaux), Chang, L.-C. (Li-Ching), Schmidt, H. (Helena), Yang, M.-L. (Min-Lee), Chen, M.-H. (Ming-Huei), Hayes, J. (James), Johnson, A.D. (Andrew), Yanek, L.R. (Lisa), Mueller, C. (Christian), Lange, L.A. (Leslie), Floyd, J. (James), Ghanbari, M. (Mohsen), Zonderman, A.B., Jukema, J.W., Hofman, A. (Albert), Duijn, C.M. (Cornelia) van, Desch, K.C. (Karl C.), Saba, Y. (Yasaman), Ozel, A.B. (Ayse), Snively, B.M. (Beverly M.), Wu, J.-Y. (Jer-Yuarn), Schmidt, R. (Reinhold), Fornage, M. (Myriam), Klein, R.J. (Robert J.), Fox, C.S. (Caroline), Matsuda, K. (Koichi), Kamatani, N. (Naoyuki), Wild, P.S. (Philipp S.), Stott, D.J. (David J.), Ford, I., Slagboom, P.E. (Eline), Yang, J. (Jaden), Chu, A.Y. (Audrey Y), Lambert, A.J. (Amy J.), Uitterlinden, A.G. (André), Franco, O.H. (Oscar), Hofer, E. (Edith), Ginsburg, D. (David), Hu, B. (Bella), Keating, J. (John), Schick, U.M. (Ursula), Brody, J.A. (Jennifer A.), Li, J.Z. (Jun Z.), Chen, Z. (Zhao), Zeller, T. (Tanja), Guralnik, J.M. (Jack M.), Chasman, D.I. (Daniel), Peters, L.L. (Luanne L.), Kubo, M. (Michiaki), Becker, D.M. (Diane M.), Li, J. (Jin), Eiriksdottir, G. (Gudny), Rotter, J.I. (Jerome I.), Levy, D. (Daniel), Grossmann, V. (Vera), Patel, K.V. (Kushang V.), Chen, C.-H., Ridker, P.M. (Paul M.), Tang, H. (Hua), Launer, L.J. (Lenore), Rice, K.M. (Kenneth M.), Li-Gao, R. (Ruifang), Ferrucci, L. (Luigi), Evans, M.K. (Michelle K.), Choudhuri, A. (Avik), Trompouki, E. (Eirini), Abraham, B.J. (Brian J.), Yang, S. (Song), Takahashi, A. (Atsushi), Kamatani, Y. (Yoichiro), Kooperberg, C. (Charles), Harris, T.B. (Tamara), Jee, S.H. (Sun Ha), Coresh, J. (Josef), Tsai, F.-J. (Fuu-Jen), Longo, D.L. (Dan L.), Chen, Y.-T. (Yuan-Tsong), Felix, J.F. (Janine), Yang, Q. (Qiong), Psaty, B.M. (Bruce), Boerwinkle, E.A. (Eric), Becker, L.C. (Lewis C.), Mook-Kanamori, D.O. (Dennis), Wilson, J.F. (James), Gudnason, V. (Vilmundur), O'Donnell, C.J. (Christopher J.), Dehghan, A. (Abbas), Cupples, L.A. (Adrienne), Nalls, M.A. (Michael), Morris, A.P. (Andrew), Okada, Y. (Yukinori), Reiner, A.P. (Alexander P.), Zon, L.I. (Leonard), Ganesh, S.K. (Santhi), Rooij, F.J.A. (Frank) van, Qayyum, Q. (Rehan), Smith, A.V. (Albert Vernon), Zhou, Y. (Yi), Trompet, S. (Stella), Tanaka, T. (Toshiko), Keller, M.F. (Margaux), Chang, L.-C. (Li-Ching), Schmidt, H. (Helena), Yang, M.-L. (Min-Lee), Chen, M.-H. (Ming-Huei), Hayes, J. (James), Johnson, A.D. (Andrew), Yanek, L.R. (Lisa), Mueller, C. (Christian), Lange, L.A. (Leslie), Floyd, J. (James), Ghanbari, M. (Mohsen), Zonderman, A.B., Jukema, J.W., Hofman, A. (Albert), Duijn, C.M. (Cornelia) van, Desch, K.C. (Karl C.), Saba, Y. (Yasaman), Ozel, A.B. (Ayse), Snively, B.M. (Beverly M.), Wu, J.-Y. (Jer-Yuarn), Schmidt, R. (Reinhold), Fornage, M. (Myriam), Klein, R.J. (Robert J.), Fox, C.S. (Caroline), Matsuda, K. (Koichi), Kamatani, N. (Naoyuki), Wild, P.S. (Philipp S.), Stott, D.J. (David J.), Ford, I., Slagboom, P.E. (Eline), Yang, J. (Jaden), Chu, A.Y. (Audrey Y), Lambert, A.J. (Amy J.), Uitterlinden, A.G. (André), Franco, O.H. (Oscar), Hofer, E. (Edith), Ginsburg, D. (David), Hu, B. (Bella), Keating, J. (John), Schick, U.M. (Ursula), Brody, J.A. (Jennifer A.), Li, J.Z. (Jun Z.), Chen, Z. (Zhao), Zeller, T. (Tanja), Guralnik, J.M. (Jack M.), Chasman, D.I. (Daniel), Peters, L.L. (Luanne L.), Kubo, M. (Michiaki), Becker, D.M. (Diane M.), Li, J. (Jin), Eiriksdottir, G. (Gudny), Rotter, J.I. (Jerome I.), Levy, D. (Daniel), Grossmann, V. (Vera), Patel, K.V. (Kushang V.), Chen, C.-H., Ridker, P.M. (Paul M.), Tang, H. (Hua), Launer, L.J. (Lenore), Rice, K.M. (Kenneth M.), Li-Gao, R. (Ruifang), Ferrucci, L. (Luigi), Evans, M.K. (Michelle K.), Choudhuri, A. (Avik), Trompouki, E. (Eirini), Abraham, B.J. (Brian J.), Yang, S. (Song), Takahashi, A. (Atsushi), Kamatani, Y. (Yoichiro), Kooperberg, C. (Charles), Harris, T.B. (Tamara), Jee, S.H. (Sun Ha), Coresh, J. (Josef), Tsai, F.-J. (Fuu-Jen), Longo, D.L. (Dan L.), Chen, Y.-T. (Yuan-Tsong), Felix, J.F. (Janine), Yang, Q. (Qiong), Psaty, B.M. (Bruce), Boerwinkle, E.A. (Eric), Becker, L.C. (Lewis C.), Mook-Kanamori, D.O. (Dennis), Wilson, J.F. (James), Gudnason, V. (Vilmundur), O'Donnell, C.J. (Christopher J.), Dehghan, A. (Abbas), Cupples, L.A. (Adrienne), Nalls, M.A. (Michael), Morris, A.P. (Andrew), Okada, Y. (Yukinori), Reiner, A.P. (Alexander P.), Zon, L.I. (Leonard), and Ganesh, S.K. (Santhi)

Abstract

Genome-wide association studies (GWASs) have identified loci for erythrocyte traits in primarily European ancestry populations. We conducted GWAS meta-analyses of six erythrocyte traits in 71,638 individuals from European, East Asian, and African ancestries using a Bayesian approach to account for heterogeneity in allelic effects and variation in the structure of linkage disequilibrium between ethnicities. We identified seven loci for erythrocyte traits including a locus (RBPM

Published
2017
Full Text
View/download PDF

13. Chamber identity programs drive early functional partitioning of the heart

Author

Mosimann, C., Panáková, D., Werdich, A.A., Musso, G., Burger, A., Lawson, K.L., Carr, L.A., Nevis, K.R., Sabeh, M.K, Zhou, Y., Davidson, A.J., DiBiase, A., Burns, C.E., Burns, C.G., MacRae, C.A., and Zon, L.I.

Subjects
Cardiovascular and Metabolic Diseases
Abstract

The vertebrate heart muscle (myocardium) develops from the first heart field (FHF) and expands by adding second heart field (SHF) cells. While both lineages exist already in teleosts, the primordial contributions of FHF and SHF to heart structure and function remain incompletely understood. Here we delineate the functional contribution of the FHF and SHF to the zebrafish heart using the cis-regulatory elements of the draculin (drl) gene. The drl reporters initially delineate the lateral plate mesoderm, including heart progenitors. Subsequent myocardial drl reporter expression restricts to FHF descendants. We harnessed this unique feature to uncover that loss of tbx5a and pitx2 affect relative FHF versus SHF contributions to the heart. High-resolution physiology reveals distinctive electrical properties of each heart field territory that define a functional boundary within the single zebrafish ventricle. Our data establish that the transcriptional program driving cardiac septation regulates physiologic ventricle partitioning, which successively provides mechanical advantages of sequential contraction.

Published
2015

14. Meta-analysis of rare and common exome chip variants identifies S1PR4 and other loci influencing blood cell traits

Author

Pankratz, V.S. (Shane), Schick, U.M. (Ursula), Zhou, Y. (Yi), Zhou, W. (Wei), Ahluwalia, T.S. (Tarunveer Singh), Allende, M.L. (Maria Laura), Auer, P. (Paul), Bork-Jensen, J. (Jette), Brody, J.A. (Jennifer A.), Chen, M.-H. (Ming-Huei), Clavo, V. (Vinna), Eicher, J.D. (John D.), Grarup, N. (Niels), Hagedorn, E.J. (Elliott J.), Hu, B. (Bella), Hunker, K. (Kristina), Johnson, A.D. (Andrew), Leusink, M. (Maarten), Lu, Y. (Yingchang), Lyytikäinen, L.-P. (Leo-Pekka), Manichaikul, A. (Ani), Marioni, R.E. (Riccardo), Nalls, M.A. (Michael), Pazoki, R. (Raha), Smith, A.V. (Albert Vernon), Rooij, F.J.A. (Frank) van, Yang, M.-L. (Min-Lee), Zhang, X. (Xiaoling), Zhang, Y. (Yan), Asselbergs, F.W. (Folkert), Boerwinkle, E.A. (Eric), Borecki, I.B. (Ingrid), Bottinger, E.P. (Erwin), Cushman, M. (Mary Ann), Bakker, P.I.W. (Paul) de, Deary, I.J. (Ian), Dong, L. (Liguang), Feitosa, M.F. (Mary Furlan), Floyd, J. (James), Franceschini, N. (Nora), Franco, O.H. (Oscar), Garcia, M. (Melissa), Grove, M.L. (Megan), Gudnason, V. (Vilmundur), Hansen, T. (T.), Harris, T.B. (Tamara), Hofman, A. (Albert), Jackson, R.D. (Rebecca), Jia, J. (Jia), Kähönen, M. (Mika), Launer, L.J. (Lenore J.), Lehtimäki, T. (Terho), Liewald, D.C.M. (David), Linneberg, A. (Allan), Liu, Y. (YongMei), Loos, R.J.F. (Ruth), Nguyen, V.M. (Vy M.), Numans, M.E. (Mattijs), Pedersen, O. (Oluf), Psaty, B.M. (Bruce M.), Raitakari, O.T. (Olli T.), Rich, S.S. (Stephen), Rivadeneira Ramirez, F. (Fernando), Di Sant, A.M.R. (Amanda M. Rosa), Rotter, J.I. (Jerome I.), Starr, J.M. (John), Taylor, K.D. (Kent), Thuesen, B.H. (Betina Heinsbek), Tracy, R.P. (Russell), Uitterlinden, A.G. (André), Wang, J. (Jiansong), Wang, J. (Judy), Dehghan, A. (Abbas), Huo, Y. (Yong), Cupples, L.A. (Adrienne), Wilson, J.F. (James), Proia, R.L. (Richard L.), Zon, L.I. (Leonard), O'Donnell, C.J. (Christopher), Reiner, A.P. (Alex P.), Ganesh, S.K. (Santhi), Pankratz, V.S. (Shane), Schick, U.M. (Ursula), Zhou, Y. (Yi), Zhou, W. (Wei), Ahluwalia, T.S. (Tarunveer Singh), Allende, M.L. (Maria Laura), Auer, P. (Paul), Bork-Jensen, J. (Jette), Brody, J.A. (Jennifer A.), Chen, M.-H. (Ming-Huei), Clavo, V. (Vinna), Eicher, J.D. (John D.), Grarup, N. (Niels), Hagedorn, E.J. (Elliott J.), Hu, B. (Bella), Hunker, K. (Kristina), Johnson, A.D. (Andrew), Leusink, M. (Maarten), Lu, Y. (Yingchang), Lyytikäinen, L.-P. (Leo-Pekka), Manichaikul, A. (Ani), Marioni, R.E. (Riccardo), Nalls, M.A. (Michael), Pazoki, R. (Raha), Smith, A.V. (Albert Vernon), Rooij, F.J.A. (Frank) van, Yang, M.-L. (Min-Lee), Zhang, X. (Xiaoling), Zhang, Y. (Yan), Asselbergs, F.W. (Folkert), Boerwinkle, E.A. (Eric), Borecki, I.B. (Ingrid), Bottinger, E.P. (Erwin), Cushman, M. (Mary Ann), Bakker, P.I.W. (Paul) de, Deary, I.J. (Ian), Dong, L. (Liguang), Feitosa, M.F. (Mary Furlan), Floyd, J. (James), Franceschini, N. (Nora), Franco, O.H. (Oscar), Garcia, M. (Melissa), Grove, M.L. (Megan), Gudnason, V. (Vilmundur), Hansen, T. (T.), Harris, T.B. (Tamara), Hofman, A. (Albert), Jackson, R.D. (Rebecca), Jia, J. (Jia), Kähönen, M. (Mika), Launer, L.J. (Lenore J.), Lehtimäki, T. (Terho), Liewald, D.C.M. (David), Linneberg, A. (Allan), Liu, Y. (YongMei), Loos, R.J.F. (Ruth), Nguyen, V.M. (Vy M.), Numans, M.E. (Mattijs), Pedersen, O. (Oluf), Psaty, B.M. (Bruce M.), Raitakari, O.T. (Olli T.), Rich, S.S. (Stephen), Rivadeneira Ramirez, F. (Fernando), Di Sant, A.M.R. (Amanda M. Rosa), Rotter, J.I. (Jerome I.), Starr, J.M. (John), Taylor, K.D. (Kent), Thuesen, B.H. (Betina Heinsbek), Tracy, R.P. (Russell), Uitterlinden, A.G. (André), Wang, J. (Jiansong), Wang, J. (Judy), Dehghan, A. (Abbas), Huo, Y. (Yong), Cupples, L.A. (Adrienne), Wilson, J.F. (James), Proia, R.L. (Richard L.), Zon, L.I. (Leonard), O'Donnell, C.J. (Christopher), Reiner, A.P. (Alex P.), and Ganesh, S.K. (Santhi)

Abstract

Hematologic measures such as hematocrit and white blood cell (WBC) count are heritable and clinically relevant. We analyzed erythrocyte and WBC phenotypes in 52,531 individuals (37,775 of European ancestry, 11,589 African Americans, and 3,167 Hispanic Americans) from 16 population-based cohorts with Illumina HumanExome BeadChip genotypes. We then performed replication analyses of new discoveries in 18,018 European-American women and 5,261 Han Chinese. We identified and replicated four new erythrocyte trait-locus associations (CEP89, SHROOM3, FADS2, and APOE) and six new WBC loci for neutrophil count (S1PR4), monocyte count (BTBD8, NLRP12, and IL17RA), eosinophil count (IRF1), and total WBC count (MYB). The association of a rare missense variant in S1PR4 supports the role of sphingosine-1-phosphate signaling in leukocyte trafficking and circulating neutrophil counts. Loss-of-function experiments for S1pr4 in mouse and s1pr4 in zebrafish demonstrated phenotypes consistent with the association observed in humans and altered kinetics of neutrophil recruitment and resolution in response to tissue injury.

Published
2016
Full Text
View/download PDF

15. A novel transcriptional regulator is a candidate for the zebrafish moonshine gene

Author

Ransom, D.G., Bahary, N., Barut, B.A., Saganic, W.J., and Zon, L.I.

Subjects
Zebra fish -- Genetic aspects, Genetic transcription -- Analysis, Hematopoiesis -- Regulation, Developmental genetics -- Research, Biological sciences
Abstract

We have utilized positional cloning techniques to execute a chromosomal walk through the zebrafish moonshine locus and have isolated a putative candidate gene, moonshine candidate 1 (MC1). Eight mooshine (mon) mutant alleles of various phenotypic strengths were originally identified in an ENU mutagenesis screen based on observations of embryonic red blood cell number in zebrafish embryos. All of the mutant mon alleles are recessive and cause severe anemia visible from the onset of circulation. MC1 is a novel gene that encodes 2 PHD fingers and a bromodomain thus sharing several structural domains in common with drosophila trithorax and human MLL. This suggests that MC1 is a transcriptional regulator maintaining tissue-specific gene expression. MC1 is an abundant maternal mRNA. The zygotic expression pattern of MC1 is similar to spadetail, another gene essential for hematopoiesis. In addition to their expression in mesoderm, both have a wave of expression in erythroblasts around 22 hpf. Transient over-expression of MC1 causes ventralization of zebrafish embryos, reducing anterior and dorsal structures including brain and notochord while increasing the number of blood cells. Rescue experiments and sequencing of mutant alleles are underway. In summary, MC1 is a novel gene in the critical mon interval, is expressed similar to spadetail at the correct time and place to influence blood development, and over expression of MC1 can ventralize embryos. Thus, MC1 is a strong candidate for men, a gene that functions in a genetic pathway controlling the differentiation of blood cells from ventral mesoderm.

Published
2000

18. Minimum information specification for in situ hybridization and immunohistochemistry experiments

Author

Deutsch, E.W., Ball, C.A., Berman, J.J., Bova, G.S., Brazma, A., Bumgarner, R.E., Campbell, D., Causton, H.C., Christiansen, J.H., Daian, F., Dauga, D., Davidson, D.R., Gimenez, G., Goo, Y.A., Grimmond, S., Henrich, T., Herrmann, B.G., Johnson, M.H., Korb, M., Mills, J.C., Oudes, A.J., Parkinson, H.E., Pascal, L.E., Pollet, N., Quackenbush, J., Ramialison, M., Ringwald, M., Salgado, David, Sansone, S.A., Sherlock, G., Stoeckert, C.J., Swedlow, J., Taylor, R.C., Walashek, L., Warford, A., Wilkinson, D.G., Zhou, Y., Zon, L.I., Liu, A.Y., True, L.D., Institut de Biologie du Développement de Marseille (IBDM), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.BC]Life Sciences [q-bio]/Cellular Biology
Published
2008

19. The zebrafish reference genome sequence and its relationship to the human genome.

Author

Howe, K., Clark, M.D., Torroja, C.F., Torrance, J., Berthelot, C., Muffato, M., Collins, J.E., Humphray, S., McLaren, K., Matthews, L., McLaren, S., Sealy, I., Caccamo, M., Churcher, C., Scott, C., Barrett, J.C., Koch, R., Rauch, G.J., White, S., Chow, W., Kilian, B., Quintais, L.T., Guerra-Assuncao, J.A., Zhou, Y., Gu, Y., Yen, J., Vogel, J.H., Eyre, T., Redmond, S., Banerjee, R., Chi, J., Fu, B., Langley, E., Maguire, S.F., Laird, G.K., Lloyd, D., Kenyon, E., Donaldson, S., Sehra, H., Almeida-King, J., Loveland, J., Trevanion, S., Jones, M., Quail, M., Willey, D., Hunt, A., Burton, J., Sims, S., McLay, K., Plumb, B., Davis, J., Clee, C., Oliver, K., Clark, R., Riddle, C., Elliot, D., Threadgold, G., Harden, G., Ware, D., Mortimore, B., Kerry, G., Heath, P., Phillimore, B., Tracey, A., Corby, N., Dunn, M., Johnson, C., Wood, J., Clark, S., Pelan, S., Griffiths, G., Smith, M., Glithero, R., Howden, P., Barker, N., Stevens, C., Harley, J., Holt, K., Panagiotidis, G., Lovell, J., Beasley, H., Henderson, C., Gordon, D., Auger, K., Wright, D., Collins, J., Raisen, C., Dyer, L., Leung, K., Robertson, L., Ambridge, K., Leongamornlert, D., McGuire, S., Gilderthorp, R., Griffiths, C., Manthravadi, D., Nichol, S., Barker, G., Whitehead, S., Kay, M., Brown, J., Murnane, C., Gray, E., Humphries, M., Sycamore, N., Barker, D., Saunders, D., Wallis, J., Babbage, A., Hammond, S., Mashreghi-Mohammadi, M., Barr, L., Martin, S., Wray, P., Ellington, A., Matthews, N., Ellwood, M., Woodmansey, R., Clark, G., Cooper, J., Tromans, A., Grafham, D., Skuce, C., Pandian, R., Andrews, R., Harrison, E., Kimberley, A., Garnett, J., Fosker, N., Hall, R., Garner, P., Kelly, D., Bird, C., Palmer, S., Gehring, I., Berger, A., Dooley, C.M., Ersan-Urun, Z., Eser, C., Geiger, H., Geisler, M., Karotki, L., Kirn, A., Konantz, J., Konantz, M., Oberlander, M., Rudolph-Geiger, S., Teucke, M., Osoegawa, K., Zhu, B., rapp, A., Widaa, S., Langford, C., Yang, F., Carter, N.P., Harrow, J., Ning, Z., Herrero, J., Searle, S.M., Enright, A., Geisler, R., Plasterk, R.H.A., Lee, C., Westerfield, M., de Jong, P.J., Zon, L.I., Postlethwait, J.H., Nusslein-Volhard, C., Hubbard, T.J., Roest Crollius, H., Rogers, J., Stemple, D.L., Begum, S., Lloyd, C., Lanz, C., Raddatz, G., Schuster, S.C., Howe, K., Clark, M.D., Torroja, C.F., Torrance, J., Berthelot, C., Muffato, M., Collins, J.E., Humphray, S., McLaren, K., Matthews, L., McLaren, S., Sealy, I., Caccamo, M., Churcher, C., Scott, C., Barrett, J.C., Koch, R., Rauch, G.J., White, S., Chow, W., Kilian, B., Quintais, L.T., Guerra-Assuncao, J.A., Zhou, Y., Gu, Y., Yen, J., Vogel, J.H., Eyre, T., Redmond, S., Banerjee, R., Chi, J., Fu, B., Langley, E., Maguire, S.F., Laird, G.K., Lloyd, D., Kenyon, E., Donaldson, S., Sehra, H., Almeida-King, J., Loveland, J., Trevanion, S., Jones, M., Quail, M., Willey, D., Hunt, A., Burton, J., Sims, S., McLay, K., Plumb, B., Davis, J., Clee, C., Oliver, K., Clark, R., Riddle, C., Elliot, D., Threadgold, G., Harden, G., Ware, D., Mortimore, B., Kerry, G., Heath, P., Phillimore, B., Tracey, A., Corby, N., Dunn, M., Johnson, C., Wood, J., Clark, S., Pelan, S., Griffiths, G., Smith, M., Glithero, R., Howden, P., Barker, N., Stevens, C., Harley, J., Holt, K., Panagiotidis, G., Lovell, J., Beasley, H., Henderson, C., Gordon, D., Auger, K., Wright, D., Collins, J., Raisen, C., Dyer, L., Leung, K., Robertson, L., Ambridge, K., Leongamornlert, D., McGuire, S., Gilderthorp, R., Griffiths, C., Manthravadi, D., Nichol, S., Barker, G., Whitehead, S., Kay, M., Brown, J., Murnane, C., Gray, E., Humphries, M., Sycamore, N., Barker, D., Saunders, D., Wallis, J., Babbage, A., Hammond, S., Mashreghi-Mohammadi, M., Barr, L., Martin, S., Wray, P., Ellington, A., Matthews, N., Ellwood, M., Woodmansey, R., Clark, G., Cooper, J., Tromans, A., Grafham, D., Skuce, C., Pandian, R., Andrews, R., Harrison, E., Kimberley, A., Garnett, J., Fosker, N., Hall, R., Garner, P., Kelly, D., Bird, C., Palmer, S., Gehring, I., Berger, A., Dooley, C.M., Ersan-Urun, Z., Eser, C., Geiger, H., Geisler, M., Karotki, L., Kirn, A., Konantz, J., Konantz, M., Oberlander, M., Rudolph-Geiger, S., Teucke, M., Osoegawa, K., Zhu, B., rapp, A., Widaa, S., Langford, C., Yang, F., Carter, N.P., Harrow, J., Ning, Z., Herrero, J., Searle, S.M., Enright, A., Geisler, R., Plasterk, R.H.A., Lee, C., Westerfield, M., de Jong, P.J., Zon, L.I., Postlethwait, J.H., Nusslein-Volhard, C., Hubbard, T.J., Roest Crollius, H., Rogers, J., Stemple, D.L., Begum, S., Lloyd, C., Lanz, C., Raddatz, G., and Schuster, S.C.

Abstract

Zebrafish have become a popular organism for the study of vertebrate gene function. The virtually transparent embryos of this species, and the ability to accelerate genetic studies by gene knockdown or overexpression, have led to the widespread use of zebrafish in the detailed investigation of vertebrate gene function and increasingly, the study of human genetic disease. However, for effective modelling of human genetic disease it is important to understand the extent to which zebrafish genes and gene structures are related to orthologous human genes. To examine this, we generated a high-quality sequence assembly of the zebrafish genome, made up of an overlapping set of completely sequenced large-insert clones that were ordered and oriented using a high-resolution high-density meiotic map. Detailed automatic and manual annotation provides evidence of more than 26,000 protein-coding genes, the largest gene set of any vertebrate so far sequenced. Comparison to the human reference genome shows that approximately 70% of human genes have at least one obvious zebrafish orthologue. In addition, the high quality of this genome assembly provides a clearer understanding of key genomic features such as a unique repeat content, a scarcity of pseudogenes, an enrichment of zebrafish-specific genes on chromosome 4 and chromosomal regions that influence sex determination., Zebrafish have become a popular organism for the study of vertebrate gene function. The virtually transparent embryos of this species, and the ability to accelerate genetic studies by gene knockdown or overexpression, have led to the widespread use of zebrafish in the detailed investigation of vertebrate gene function and increasingly, the study of human genetic disease. However, for effective modelling of human genetic disease it is important to understand the extent to which zebrafish genes and gene structures are related to orthologous human genes. To examine this, we generated a high-quality sequence assembly of the zebrafish genome, made up of an overlapping set of completely sequenced large-insert clones that were ordered and oriented using a high-resolution high-density meiotic map. Detailed automatic and manual annotation provides evidence of more than 26,000 protein-coding genes, the largest gene set of any vertebrate so far sequenced. Comparison to the human reference genome shows that approximately 70% of human genes have at least one obvious zebrafish orthologue. In addition, the high quality of this genome assembly provides a clearer understanding of key genomic features such as a unique repeat content, a scarcity of pseudogenes, an enrichment of zebrafish-specific genes on chromosome 4 and chromosomal regions that influence sex determination.

Published
2013

21. APC mutant zebrafish uncover a changing temporal requirement for wnt signaling in liver development.

Author

Goessling, W., North, T.E., Lord, A.M., Ceol, C., Lee, S., Weidinger, G., Bourque, C., Strijbosch, R., Haramis, A.P., Puder, M., Clevers, H., Moon, R.T., Zon, L.I., Goessling, W., North, T.E., Lord, A.M., Ceol, C., Lee, S., Weidinger, G., Bourque, C., Strijbosch, R., Haramis, A.P., Puder, M., Clevers, H., Moon, R.T., and Zon, L.I.

Abstract

Developmental signaling pathways hold the keys to unlocking the promise of adult tissue regeneration, and to inhibiting carcinogenesis. Patients with mutations in the Adenomatous Polyposis Coli (APC) gene are at increased risk of developing hepatoblastoma, an embryonal form of liver cancer, suggesting that Wnt affects hepatic progenitor cells. To elucidate the role of APC loss and enhanced Wnt activity in liver development, we examined APC mutant and wnt inducible transgenic zebrafish. APC(+/-) embryos developed enlarged livers through biased induction of hepatic gene programs and increased proliferation. Conversely, APC(-/-) embryos formed no livers. Blastula transplantations determined that the effects of APC loss were cell autonomous. Induction of wnt modulators confirmed biphasic consequences of wnt activation: endodermal pattern formation and gene expression required suppression of wnt signaling in early somitogenesis; later, increased wnt activity altered endodermal fate by enhancing liver growth at the expense of pancreas formation; these effects persisted into the larval stage. In adult APC(+/-) zebrafish, increased wnt activity significantly accelerated liver regeneration after partial hepatectomy. Similarly, liver regeneration was significantly enhanced in APC(Min/+) mice, indicating the conserved effect of Wnt pathway activation in liver regeneration across vertebrate species. These studies reveal an important and time-dependent role for wnt signaling during liver development and regeneration., Developmental signaling pathways hold the keys to unlocking the promise of adult tissue regeneration, and to inhibiting carcinogenesis. Patients with mutations in the Adenomatous Polyposis Coli (APC) gene are at increased risk of developing hepatoblastoma, an embryonal form of liver cancer, suggesting that Wnt affects hepatic progenitor cells. To elucidate the role of APC loss and enhanced Wnt activity in liver development, we examined APC mutant and wnt inducible transgenic zebrafish. APC(+/-) embryos developed enlarged livers through biased induction of hepatic gene programs and increased proliferation. Conversely, APC(-/-) embryos formed no livers. Blastula transplantations determined that the effects of APC loss were cell autonomous. Induction of wnt modulators confirmed biphasic consequences of wnt activation: endodermal pattern formation and gene expression required suppression of wnt signaling in early somitogenesis; later, increased wnt activity altered endodermal fate by enhancing liver growth at the expense of pancreas formation; these effects persisted into the larval stage. In adult APC(+/-) zebrafish, increased wnt activity significantly accelerated liver regeneration after partial hepatectomy. Similarly, liver regeneration was significantly enhanced in APC(Min/+) mice, indicating the conserved effect of Wnt pathway activation in liver regeneration across vertebrate species. These studies reveal an important and time-dependent role for wnt signaling during liver development and regeneration.

Published
2008

36. The Many Faces of Gene Regulation: Extrinsic Control of Cell Fate and Function

Author

Audrey Sporrij, Clevers, J.C., Zon, L.I., and University Utrecht

Subjects
Regulation of gene expression, Niche Signals, Stem Cells, Neural crest, Melanoma, Neural Crest, Hematopoiesis, Stem Cells, Chromatin, Transcription, Niche Signals, Stress, Biology, Cell fate determination, Stress, Chromatin, Hematopoiesis, Cell biology, Neural Crest, Transcription (biology), Stem cell, Control (linguistics), Melanoma, Transcription, Function (biology)
Abstract

Cell fate and function is determined by the complex interplay between extrinsic and intrinsic factors. Environmental signals play important roles in the processes that underlie cell behavior. All cells have the ability to recognize extracellular molecules and can respond by altering the transcriptional programs that establish and maintain cell identity. While extrinsic stresses are known to affect gene regulation, exactly how these signals are integrated into highly specific transcriptional programs to drive certain cell fates remains poorly understood. The objective of the research presented here was to dissect the mechanisms through which environmental signals regulate gene expression and control cell fate. Our work revealed that activation of intracellular signaling pathways by environmental molecules is directly received, interpreted, and answered to, by chromatin. This leads to transcriptional activation or repression. The chromatin landscape is highly dynamic and exceedingly reactive to external stress. We identified several mechanisms by which chromatin adapts to extrinsic signals and modifies gene expression. Environmental conditions can be sensed by multifunctional proteins that masquerade as transcription factors (TFs) or transcriptional co-activators and convert the stress into a transcriptional response. We observed that nucleotide deficiency is interpreted by the RNA binding protein DDX21 that also functions as a chromatin factor to facilitate transcription elongation. Following stress sensing, DDX21 disengages from chromatin to enforce transcriptional pausing during suboptimal cellular conditions. Instead, DDX21 engages mRNAs to potentially stabilize transcripts that are required to restore homeostasis. A stress-related function for chromatin factors and RNA binding proteins could allow for the regulation of various cellular processes at once. We propose that the mechanism of chromatin factors functioning as stress sensors is evolutionarily conserved and suggest that other chromatin proteins with similar dual functions likely exist. This research also found that the chromatin structure itself facilitates induction of stress response genes. The local nucleosome structure determines the responsiveness of individual regulatory elements to stress. We found that stress-inducible enhancers are pre-marked with histone variant H2A.Z-containing nucleosomes. These enhancer nucleosomes are not prohibitive of TF binding. Rather, the observed epigenetic characteristics enable rapid chromatin remodeling and quick, transient alterations in gene expression. The stimuli-responsive enhancer landscape is such that it can promptly receive, and respond to, signals from the extracellular environment. We hypothesize that the chromatin architecture of stimuli-responsive regulatory regions is organized at earlier stages of cell lineage specification. Precisely when and how the epigenetic pre-marking of inducible enhancers happens is currently unknown and requires further investigation. Together, the work described here identified how extrinsic signals directly impact chromatin. Adaptive mechanisms such as multifunctional chromatin factors, epigenetic pre-marking of regulatory regions, and swift chromatin remodeling permit acute regulation of genes specific to cell fate. While our work specifically focused on transcriptional control of cells from the two most regenerative systems of the body, those being the skin and the blood, our findings may hold true for other cell types.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results