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1. Citrobacter rodentium is an unstable pathogen showing evidence of significant genomic flux.

Author

Nicola K Petty, Theresa Feltwell, Derek Pickard, Simon Clare, Ana L Toribio, Maria Fookes, Kevin Roberts, Rita Monson, Satheesh Nair, Robert A Kingsley, Richard Bulgin, Siouxsie Wiles, David Goulding, Thomas Keane, Craig Corton, Nicola Lennard, David Harris, David Willey, Richard Rance, Lu Yu, Jyoti S Choudhary, Carol Churcher, Michael A Quail, Julian Parkhill, Gad Frankel, Gordon Dougan, George P C Salmond, and Nicholas R Thomson

Subjects
Immunologic diseases. Allergy, RC581-607, Biology (General), QH301-705.5
Abstract

Citrobacter rodentium is a natural mouse pathogen that causes attaching and effacing (A/E) lesions. It shares a common virulence strategy with the clinically significant human A/E pathogens enteropathogenic E. coli (EPEC) and enterohaemorrhagic E. coli (EHEC) and is widely used to model this route of pathogenesis. We previously reported the complete genome sequence of C. rodentium ICC168, where we found that the genome displayed many characteristics of a newly evolved pathogen. In this study, through PFGE, sequencing of isolates showing variation, whole genome transcriptome analysis and examination of the mobile genetic elements, we found that, consistent with our previous hypothesis, the genome of C. rodentium is unstable as a result of repeat-mediated, large-scale genome recombination and because of active transposition of mobile genetic elements such as the prophages. We sequenced an additional C. rodentium strain, EX-33, to reveal that the reference strain ICC168 is representative of the species and that most of the inactivating mutations were common to both isolates and likely to have occurred early on in the evolution of this pathogen. We draw parallels with the evolution of other bacterial pathogens and conclude that C. rodentium is a recently evolved pathogen that may have emerged alongside the development of inbred mice as a model for human disease.

Published
2011
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2. Genomic evidence for the evolution of Streptococcus equi: host restriction, increased virulence, and genetic exchange with human pathogens.

Author

Matthew T G Holden, Zoe Heather, Romain Paillot, Karen F Steward, Katy Webb, Fern Ainslie, Thibaud Jourdan, Nathalie C Bason, Nancy E Holroyd, Karen Mungall, Michael A Quail, Mandy Sanders, Mark Simmonds, David Willey, Karen Brooks, David M Aanensen, Brian G Spratt, Keith A Jolley, Martin C J Maiden, Michael Kehoe, Neil Chanter, Stephen D Bentley, Carl Robinson, Duncan J Maskell, Julian Parkhill, and Andrew S Waller

Subjects
Immunologic diseases. Allergy, RC581-607, Biology (General), QH301-705.5
Abstract

The continued evolution of bacterial pathogens has major implications for both human and animal disease, but the exchange of genetic material between host-restricted pathogens is rarely considered. Streptococcus equi subspecies equi (S. equi) is a host-restricted pathogen of horses that has evolved from the zoonotic pathogen Streptococcus equi subspecies zooepidemicus (S. zooepidemicus). These pathogens share approximately 80% genome sequence identity with the important human pathogen Streptococcus pyogenes. We sequenced and compared the genomes of S. equi 4047 and S. zooepidemicus H70 and screened S. equi and S. zooepidemicus strains from around the world to uncover evidence of the genetic events that have shaped the evolution of the S. equi genome and led to its emergence as a host-restricted pathogen. Our analysis provides evidence of functional loss due to mutation and deletion, coupled with pathogenic specialization through the acquisition of bacteriophage encoding a phospholipase A(2) toxin, and four superantigens, and an integrative conjugative element carrying a novel iron acquisition system with similarity to the high pathogenicity island of Yersinia pestis. We also highlight that S. equi, S. zooepidemicus, and S. pyogenes share a common phage pool that enhances cross-species pathogen evolution. We conclude that the complex interplay of functional loss, pathogenic specialization, and genetic exchange between S. equi, S. zooepidemicus, and S. pyogenes continues to influence the evolution of these important streptococci.

Published
2009
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3. The genome sequence of Caenorhabditis briggsae: a platform for comparative genomics.

Author

Lincoln D Stein, Zhirong Bao, Darin Blasiar, Thomas Blumenthal, Michael R Brent, Nansheng Chen, Asif Chinwalla, Laura Clarke, Chris Clee, Avril Coghlan, Alan Coulson, Peter D'Eustachio, David H A Fitch, Lucinda A Fulton, Robert E Fulton, Sam Griffiths-Jones, Todd W Harris, LaDeana W Hillier, Ravi Kamath, Patricia E Kuwabara, Elaine R Mardis, Marco A Marra, Tracie L Miner, Patrick Minx, James C Mullikin, Robert W Plumb, Jane Rogers, Jacqueline E Schein, Marc Sohrmann, John Spieth, Jason E Stajich, C Wei, David Willey, Richard K Wilson, Richard Durbin, and Robert H Waterston

Subjects
Biology (General), QH301-705.5
Abstract

The soil nematodes Caenorhabditis briggsae and Caenorhabditis elegans diverged from a common ancestor roughly 100 million years ago and yet are almost indistinguishable by eye. They have the same chromosome number and genome sizes, and they occupy the same ecological niche. To explore the basis for this striking conservation of structure and function, we have sequenced the C. briggsae genome to a high-quality draft stage and compared it to the finished C. elegans sequence. We predict approximately 19,500 protein-coding genes in the C. briggsae genome, roughly the same as in C. elegans. Of these, 12,200 have clear C. elegans orthologs, a further 6,500 have one or more clearly detectable C. elegans homologs, and approximately 800 C. briggsae genes have no detectable matches in C. elegans. Almost all of the noncoding RNAs (ncRNAs) known are shared between the two species. The two genomes exhibit extensive colinearity, and the rate of divergence appears to be higher in the chromosomal arms than in the centers. Operons, a distinctive feature of C. elegans, are highly conserved in C. briggsae, with the arrangement of genes being preserved in 96% of cases. The difference in size between the C. briggsae (estimated at approximately 104 Mbp) and C. elegans (100.3 Mbp) genomes is almost entirely due to repetitive sequence, which accounts for 22.4% of the C. briggsae genome in contrast to 16.5% of the C. elegans genome. Few, if any, repeat families are shared, suggesting that most were acquired after the two species diverged or are undergoing rapid evolution. Coclustering the C. elegans and C. briggsae proteins reveals 2,169 protein families of two or more members. Most of these are shared between the two species, but some appear to be expanding or contracting, and there seem to be as many as several hundred novel C. briggsae gene families. The C. briggsae draft sequence will greatly improve the annotation of the C. elegans genome. Based on similarity to C. briggsae, we found strong evidence for 1,300 new C. elegans genes. In addition, comparisons of the two genomes will help to understand the evolutionary forces that mold nematode genomes.

Published
2003
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4. A haplotype map of the human genome

Author

Mark Leppert, Aravinda Chakravarti, Charmaine D.M. Royal, Sarah S. Murray, Renzong Qiu, Panos Deloukas, Renwu Wang, David A. Hinds, Barbara E. Stranger, Xiaoli Tang, Huanming Yang, John W. Belmont, Nigel P. Carter, Huy Nguyen, William Mak, Kazuto Kato, Shiran Pasternak, Chaohua Li, Jeffrey C. Barrett, Lon R. Cardon, Vincent Ferretti, Atsushi Nagashima, Peter E. Chen, Stephen F. Schaffner, Hongbo Fu, Zhu Chen, Siqi Liu, John Burton, Paul Hardenbol, Gudmundur A. Thorisson, Yusuke Nakamura, Mark Griffiths, Imtiaz Yakub, Eiko Suda, Gonçalo R. Abecasis, Carl S. Kashuk, Qingrun Zhang, Yoshimitsu Fukushima, Karen Kennedy, Sarah E. Hunt, Yi Wang, Norio Niikawa, Ichiro Matsuda, Lynn F. Zacharia, Lalitha Krishnan, Zhen Wang, Stéphanie Roumy, C M Clee, David J. Cutler, Albert V. Smith, Lincoln Stein, Simon Myers, Jane Peterson, Jun Zhou, Yozo Ohnishi, Weihua Guan, Matthew Stephens, Xiaoyan Xiong, Julian Maller, Houcan Zhang, Pui-Yan Kwok, Mark S. Guyer, Liuda Ziaugra, Jonathan Witonsky, Matthew C. Jones, Stacey Gabriel, You-Qiang Song, Daochang An, Haifeng Wang, Gilean McVean, Lawrence M. Sung, Zhijian Yao, Yan Shen, Yangfan Liu, George M. Weinstock, Ludmila Pawlikowska, Erica Sodergren, Mark T. Ross, Andrew Boudreau, Toshihiro Tanaka, Thomas D. Willis, Weitao Hu, Kelly A. Frazer, Li Jin, Robert W. Plumb, Paul I.W. de Bakker, Hongbin Zhao, Wei Lin, Sarah Sims, Richard A. Gibbs, Maura Faggart, Michael Feolo, Dennis G. Ballinger, Xun Chu, Lucinda Fulton, Marcos Delgado, Ellen Winchester, Wei Huang, Fuli Yu, Christianne R. Bird, Shaun Purcell, Jessica Roy, Dongmei Cai, Launa M. Galver, Bartha Maria Knoppers, Emmanouil T. Dermitzakis, Gao Yang, Takashi Morizono, Rachel Barry, Kirsten McLay, Daryl J. Thomas, Steve McCarroll, Jonathan Marchini, Daniel J. Richter, Andy Peiffer, Patricia Taillon-Miller, Richard K. Wilson, Stephen Kwok-Wing Tsui, Jian-Bing Fan, Lisa D. Brooks, Laura L. Stuve, Paul L'Archevêque, David M. Evans, Clémentine Sallée, Peter Donnelly, Hong Xue, Hui Zhao, Charles N. Rotimi, Jean E. McEwen, J. Tze Fei Wong, Hao Pan, Alastair Kent, Brendan Blumenstiel, Qing Li, Weiwei Sun, L. Kang, Colin Freeman, John Stewart, Chibuzor Nkwodimmah, Morris W. Foster, Don Powell, Leonardo Bottolo, Raymond D. Miller, Stephen T. Sherry, Francis S. Collins, Donna M. Muzny, Jun Yu, Ike Ajayi, Hua Han, Pardis C. Sabeti, Hongguang Wang, Takahisa Kawaguchi, Tatsuhiko Tsunoda, Guy Bellemare, Zhaohui S. Qin, H. B. Hu, Jane Rogers, Thomas J. Hudson, Mark J. Daly, Andrew P. Morris, Supriya Gupta, Ming Xiao, Patrick Varilly, Nick Patterson, Akihiro Sekine, Chris C. A. Spencer, Jonathan Morrison, Missy Dixon, Paul K.H. Tam, Jian Wang, Matthew Defelice, Susana Eyheramendy, Michael Shi, Yungang He, Ellen Wright Clayton, Richa Saxena, Heather M. Munro, Arthur L. Holden, Yayun Shen, Christine P. Bird, Bruce W. Birren, Itsik Pe'er, David R. Bentley, Lynne V. Nazareth, Pamela Whittaker, Pak C. Sham, Amy L. Camargo, David A. Wheeler, Koji Saeki, Martin Godbout, David Altshuler, Liang Xu, Ying Wang, David Willey, Alexandre Montpetit, Shin Lin, Michael S. Phillips, Changqing Zeng, Clement Adebamowo, John C. Wallenburg, Mark S. Chee, Ben Fry, Erich Stahl, Melissa Parkin, Rhian Gwilliam, Andrei Verner, Patrick J. Nailer, Lap-Chee Tsui, Bo Zhang, Fanny Chagnon, David R. Cox, Jack Spiegel, Jamie Moore, Vivian Ota Wang, Patricia A. Marshall, Takuya Kitamoto, Bruce S. Weir, Darryl Macer, Geraldine M. Clarke, Robert C. Onofrio, Mary M.Y. Waye, Wei Wang, Suzanne M. Leal, James C. Mullikin, Toyin Aniagwu, Daniel C. Koboldt, Mary Goyette, Martin Leboeuf, Isaac F. Adewole, Ruth Jamieson, Arnold Oliphant, Jessica Watkin, and Jean François Olivier

Subjects
Linkage disequilibrium, Biology, DNA, Mitochondrial, Polymorphism, Single Nucleotide, Article, Linkage Disequilibrium, Structural variation, Gene Frequency, Humans, Selection, Genetic, International HapMap Project, Genetic association, Haplotypes - genetics, Recombination, Genetic, Genetics, Chromosomes, Human, Y, Multidisciplinary, Genome, Human, DNA, Mitochondrial - genetics, Haplotype, Tag SNP, Polymorphism, Single Nucleotide - genetics, Haplotypes, Human genome, Haplotype estimation, Chromosomes, Human, Y - genetics
Abstract

Inherited genetic variation has a critical but as yet largely uncharacterized role in human disease. Here we report a public database of common variation in the human genome: more than one million single nucleotide polymorphisms (SNPs) for which accurate and complete genotypes have been obtained in 269 DNA samples from four populations, including ten 500-kilobase regions in which essentially all information about common DNA variation has been extracted. These data document the generality of recombination hotspots, a block-like structure of linkage disequilibrium and low haplotype diversity, leading to substantial correlations of SNPs with many of their neighbours. We show how the HapMap resource can guide the design and analysis of genetic association studies, shed light on structural variation and recombination, and identify loci that may have been subject to natural selection during human evolution. © 2005 Nature Publishing Group., link_to_OA_fulltext

Published
2005
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5. The DNA sequence of the human X chromosome

Author

Gernot Glöckner, Karen Thomas, Christine Lloyd, Huda Y. Zoghbi, Adrienne Hunt, Fiona Francis, Annemarie Poustka, George M. Weinstock, Xuehong Wei, Alan Tracey, Gabriele Nordsiek, Ines Müller, Graham Clarke, Oliver Beasley, John Sulston, Alfred Beck, Christian J. Buhay, Thomas Meitinger, Manjula Maheshwari, Yvonne Ramsey, Kirsten McLay, Shannon Dugan-Rocha, James G. R. Gilbert, Louisa Faulkner, Sidney Morris, Margaret Morgan, Huntington F. Willard, Leni S. Jacob, Hermela Loulseged, K M Porter, T. Daniel Andrews, Cordelia Langford, Paul Wray, Guan Chen, Juliane Ramser, Nigel P. Carter, Georgina Warry, Ruby Banerjee, Graeme Bethel, LaDeana W. Hillier, Anne Hodgson, Stephen M. J. Searle, K F Barlow, David R. Bentley, Paul E. Tabor, Kathryn L. Evans, Russell J. Grocock, Rebecca Woodmansey, Alex V Pearce, Christie Kovar-Smith, Angela Williamson, Dean Chavez, Roy Storey, Kevin L. Howe, Zhijian J. Chen, Lesette Perez, Richard A. Gibbs, Michele D'Urso, Karen N Bates, Jackie Bye, Shirin S. Joseph, Bernd Hinzmann, Paul Heath, Susan H. Kelly, Jennifer Hume, Paula E. Burch, David Buck, Mark T. Ross, David A. Wheeler, Matthew C. Jones, A K Babbage, Erica Sodergren, Sophie Palmer, Jie Ma, Elizabeth C. Sotheran, Margaret A. Leversha, Cerissa Hamilton, Hans Lehrach, Swaroop Aradhya, Michael L. Metzker, S. M. Clegg, Elizabeth J. Huckle, Audrey Fraser, Sarah Bray-Allen, C. D. Skuce, Petra Galgoczy, Richard K. Wilson, Patrick Minx, Richard E Connor, Tamsin Eades, Alfons Meindl, Michelle Smith, John M. Davis, André Rosenthal, Stuart McLaren, Geoffery Okwuonu, M. Vaudin, Laura Carrel, Ryan J. Lozado, Harminder Sehra, Richard Pandian, Sue Y Clark, Anna Kosiura, Wen Liu, Simon G. Gregory, A Tromans, Alexandra Emery-Cohen, Charles Shaw-Smith, Donna Villasana, Joseph Chako, Katja Heitmann, Robert G. David, Jennifer L. Ashurst, Craig Chinault, S Lawlor, Paul Havlak, Jane E. Loveland, Lucy Matthews, Jianling Zhou, S. Whitehead, Paul Hunt, E Sheridan, Richard Reinhardt, Tim Hubbard, Mary G. Schueler, Patrick Meidl, Helen Beasley, David Beare, Donna M. Muzny, Kerry A Ridler, Joanne C Chapman, Jennifer McDowall, Andrew Dunham, Anne Bridgeman, Gabrielle Williams, Amanda McMurray, Stefan Taudien, Matthew E. Hurles, Helen Williamson, Preethi H. Gunaratne, Alfredo Ciccodicola, R Ainscough, Alison J. Coffey, Charlotte G. Cole, Stephan Beck, Frances L Lovell, Alan Coulson, Qiaoyan Wang, Sally Jones, Charles A. Steward, Michael Hoffs, Kim C. Worley, Sarah Pelan, David Bonnin, David Schlessinger, Mathew N Whiteley, Graham Scott, Christopher N O'Dell, Tineace Taylor, Susan Rhodes, Anthony P. West, E. Hart, Ian P. Barrett, Andrea Thorpe, D. Pearson, Huyen Dinh, Susan M. Gribble, Andrew J Knights, Laurens G. Wilming, N Corby, Steven E. Scherer, Pawandeep Dhami, Gerald Nyakatura, J Lovell, M. Ali Ansari-Lari, Kerstin P. Clerc-Blankenburg, David Swarbreck, Sara Zorilla, Yanghong Gu, Karin Blechschmidt, Matthew Dunn, Andrew Brown, Kirsten M. Timms, Darren Grafham, Yan Ding, Elspeth A. Bruford, Leanne Williams, Melanie M. Wall, Hua Shen, Dina Patel, Joanne K Kershaw, Rachel Gill, Yuan Chen, Joy Davies, D C Burford, John Burton, Vicky Cobley, R I S Ashwell, Nicola Brady, Ellson Y. Chen, Ngoc Nguyen, Gaiping Wen, Gavin K. Laird, Julia E. Parrish, Carol Scott, C Griffiths, Ratna Shownkeen, Ralf Sudbrak, Denise R. DeShazo, Shiran Pasternak, Ireena Dutta, Brian Teague, Rachael Lyne, David Parker, Jane Rogers, Steve Dodsworth, Mary J. Brown, Gary E Barker, Steve Trevanion, Joanne Burgess, Jane E. Wilkinson, James T. Warren, Jen S. Conquer, R Mark Swann, Oliver Delgado, Heather R. Draper, Shailesh L Mistry, Chris Clee, Richard Durbin, Karen Clifford, John Frankland, Sarah E. Hunt, David Steffen, Christine Burrows, Daniel Verduzco, C Carder, Robert H. Waterston, Stephen Richards, Andrea Ballabio, Catherine M. Rice, David Willey, Helen Errington, Andrew Cree, K. James Durbin, Lora Lewis, D. M. Lloyd, Helen E. Steingruber, Adam Whittaker, K D Ambrose, Rhian Gwilliam, Adam Frankish, Robert S. Fulton, Judith Hernandez, Claire L Bagguley, Pieter J. de Jong, Jennifer Yen, Matthew Ellwood, Christine P. Bird, Rui Chen, Sarah Milne, Clay Davis, Alicia Hawes, Jing Lu, Sven Klages, David L. Nelson, Wayne Burrill, Jingkun Zhang, Judith Isherwood, Kathrin Reichwald, Lenee Waldron, Rebecca Deadman, Steffen Hennig, Ziad Khan, Sarah Ho, Matthias Platzer, Gareth R. Howell, Stephen Keenan, Petra Kioschis, Phillip J Howden, George Miner, David W. Johnson, and James C. Mullikin

Subjects
Male, Genetic Linkage, Genetics, Medical, Centromere, HUMAN GENOME SEQUENCE, Biology, Y chromosome, Polymorphism, Single Nucleotide, Article, Evolution, Molecular, Contig Mapping, Chromosome 16, Antigens, Neoplasm, Dosage Compensation, Genetic, Sequence Homology, Nucleic Acid, Chromosome 19, Testis, Animals, Humans, Crossing Over, Genetic, X chromosome, Repetitive Sequences, Nucleic Acid, Genetics, Chromosomes, Human, X, Chromosomes, Human, Y, Multidisciplinary, INACTIVATION CENTER, LINKED MENTAL-RETARDATION, Genomics, Sequence Analysis, DNA, REPEAT HYPOTHESIS, MAMMALIAN Y-CHROMOSOME, Chromosome 4, Chromosome 3, RNA, Female, Chromosome 21, Chromosome 22
Abstract

The human X chromosome has a unique biology that was shaped by its evolution as the sex chromosome shared by males and females. We have determined 99.3% of the euchromatic sequence of the X chromosome. Our analysis illustrates the autosomal origin of the mammalian sex chromosomes, the stepwise process that led to the progressive loss of recombination between X and Y, and the extent of subsequent degradation of the Y chromosome. LINE1 repeat elements cover one-third of the X chromosome, with a distribution that is consistent with their proposed role as way stations in the process of X-chromosome inactivation. We found 1,098 genes in the sequence, of which 99 encode proteins expressed in testis and in various tumour types. A disproportionately high number of mendelian diseases are documented for the X chromosome. Of this number, 168 have been explained by mutations in 113 X-linked genes, which in many cases were characterized with the aid of the DNA sequence.

Published
2005
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6. The Big‐Bang‐For‐Your‐Buck Theory

Author

Sheila Cox, Peter Weill, Henry C. Lucas, and David Willey

Subjects
Finance, Data collection, Economic competition, Public economics, business.industry, Nothing, Strategy and Management, Economics, Information technology, business, Investment (macroeconomics), Management Information Systems
Abstract

Do it right, and your investment in information technology can have ail sorts of strategic payoffs. Do it wrong, and you'll be paying, dearly, for nothing. Here's a guide to evaluating IT and measuring its impact.

Published
1993
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7. ONLY THE STRONG

Author

David Willey

Subjects
Consolidation (business), Strategy and Management, media_common.quotation_subject, Package design, Advertising, Business, Marketing, Creativity, Logos Bible Software, Management Information Systems, Brand loyalty, media_common
Abstract

Competition, consolidation, and couponing have made consumers savvier and brand loyalty shakier. As a result, nurturing the all‐important brand demands a new level of creativity and an increased attention to strategy. Often it means a closer look at logos and package design.

Published
1993
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8. Modelling human exposures to air pollution control (APC) residues released from landfills in England and Wales

Author

Simon J. T. Pollard, David Willey, Christopher Macleod, Ji Ping Shi, Betty Ng, Ian Martin, Bernard Fisher, Gillian H. Drew, and Raquel Duarte-Davidson

Subjects
Hazardous Waste, Polychlorinated Dibenzodioxins, Air pollution, Industrial Waste, Incineration, medicine.disease_cause, Models, Biological, Risk Assessment, Hazardous waste, Metals, Heavy, medicine, Humans, Particle Size, Air quality index, lcsh:Environmental sciences, General Environmental Science, Benzofurans, lcsh:GE1-350, Persistent organic pollutant, Air Pollutants, Wales, Waste management, Atmospheric dispersion modeling, Dibenzofurans, Polychlorinated, Refuse Disposal, Deposition (aerosol physics), England, Environmental chemistry, Environmental science, Risk assessment
Abstract

Human exposures to air pollution control (APC) residues released from 6 landfills were modeled and assessed. Following a qualitative risk characterisation, direct and indirect exposures were quantified. Site-specific air dispersion modeling was conducted for PM10, PCDDs/PCDFs, Pb, Cd, As and CrVI concentrations at the closest residential points of exposure for 4 landfill sites accepting, in total, 75% w/w of the APC residues disposed of in 2000–2001 (UK). Inhalation risks, assessed by reference to air quality standards at residential exposure points, were assessed as insignificant. Preliminary modeling suggested that indirect exposures from PCDDs/PCDFs at the 95th percentile level for the site where APC deposition rates were highest could potentially exceed the tolerable daily soil intake (TDSI) but this warrants further study given the model limitations. These results offer an initial screen of the significance of potential risks from APC disposal, which is of value in addressing concerns about the uncertainty of potential risks to human health from bulk APC disposal at strategic locations. Keywords: Air pollution control residues, Risk, Air quality impact, Landfill, Health

Published
2006

9. Population Control: A Necessity for the Preservation of Individual Liberty

Author

David Willey

Subjects
Public Administration, Sociology and Political Science, Law, 05 social sciences, 050602 political science & public administration, Economics, 050109 social psychology, 0501 psychology and cognitive sciences, Individual liberty, Population control, Social Sciences (miscellaneous), 0506 political science
Published
1997
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10. The genome sequence of Caenorhabditis briggsae: a platform for comparative genomics

Author

Elaine R. Mardis, Zhirong Bao, Lincoln Stein, Peter D'Eustachio, Jason E. Stajich, Thomas Blumenthal, Robert E Fulton, Chris Clee, Michael R. Brent, Robert W. Plumb, Ravi Kamath, LaDeana W. Hillier, Tracie L. Miner, Jacqueline E. Schein, Robert H. Waterston, Sam Griffiths-Jones, Todd W. Harris, Marc Sohrmann, Lucinda Fulton, Marco A. Marra, David H. A. Fitch, Laura Clarke, Alan Coulson, John Spieth, Jane Rogers, Richard Durbin, James C. Mullikin, Avril Coghlan, David Willey, Chaochun Wei, Asif T. Chinwalla, Darin Blasiar, Patricia E. Kuwabara, Richard K. Wilson, Patrick Minx, and Nansheng Chen

Subjects
Chromosomes, Artificial, Bacterial, Genome, 0302 clinical medicine, RNA, Transfer, Cluster Analysis, Biology (General), Bioinformatics/Computational Biology, Caenorhabditis elegans, Conserved Sequence, Genetics, 0303 health sciences, biology, General Neuroscience, Chromosome Mapping, Exons, Genomics, Physical Chromosome Mapping, Biological Evolution, Caenorhabditis, Multigene Family, General Agricultural and Biological Sciences, Plasmids, Research Article, Caenorhabditis briggsae, RNA, Spliced Leader, QH301-705.5, Evolution, Gene prediction, Molecular Sequence Data, Genetics/Genomics/Gene Therapy, General Biochemistry, Genetics and Molecular Biology, Evolution, Molecular, 03 medical and health sciences, Open Reading Frames, Species Specificity, Animals, Codon, 030304 developmental biology, Gene Library, Comparative genomics, Models, Statistical, General Immunology and Microbiology, Models, Genetic, Proteins, Sequence Analysis, DNA, biology.organism_classification, Introns, Protein Structure, Tertiary, Interspersed Repetitive Sequences, MicroRNAs, RNA, Ribosomal, RNA, Caenorhabditis remanei, 030217 neurology & neurosurgery
Abstract

The soil nematodes Caenorhabditis briggsae and Caenorhabditis elegans diverged from a common ancestor roughly 100 million years ago and yet are almost indistinguishable by eye. They have the same chromosome number and genome sizes, and they occupy the same ecological niche. To explore the basis for this striking conservation of structure and function, we have sequenced the C. briggsae genome to a high-quality draft stage and compared it to the finished C. elegans sequence. We predict approximately 19,500 protein-coding genes in the C. briggsae genome, roughly the same as in C. elegans. Of these, 12,200 have clear C. elegans orthologs, a further 6,500 have one or more clearly detectable C. elegans homologs, and approximately 800 C. briggsae genes have no detectable matches in C. elegans. Almost all of the noncoding RNAs (ncRNAs) known are shared between the two species. The two genomes exhibit extensive colinearity, and the rate of divergence appears to be higher in the chromosomal arms than in the centers. Operons, a distinctive feature of C. elegans, are highly conserved in C. briggsae, with the arrangement of genes being preserved in 96% of cases. The difference in size between the C. briggsae (estimated at approximately 104 Mbp) and C. elegans (100.3 Mbp) genomes is almost entirely due to repetitive sequence, which accounts for 22.4% of the C. briggsae genome in contrast to 16.5% of the C. elegans genome. Few, if any, repeat families are shared, suggesting that most were acquired after the two species diverged or are undergoing rapid evolution. Coclustering the C. elegans and C. briggsae proteins reveals 2,169 protein families of two or more members. Most of these are shared between the two species, but some appear to be expanding or contracting, and there seem to be as many as several hundred novel C. briggsae gene families. The C. briggsae draft sequence will greatly improve the annotation of the C. elegans genome. Based on similarity to C. briggsae, we found strong evidence for 1,300 new C. elegans genes. In addition, comparisons of the two genomes will help to understand the evolutionary forces that mold nematode genomes., With the Caenorhabditis briggsae genome now in hand, C. elegans biologists have a powerful new research tool to refine their knowledge of gene function in C. elegans and to study the path of genome evolution

Published
2003
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11. Initial sequencing and comparative analysis of the mouse genome

Author

Laura Elnitski, David B. Jaffe, Jia Li, Marina Alexandersson, Michael J. Morgan, Shiaw Pyng Yang, Robert Baertsch, Claire M. Wade, John Tromp, Michael C. Zody, Terrence S. Furey, Emma Overton-Larty, Stephen D. Brown, Scott Schwartz, Diane M. Dunn, J. P. Leger, Kris A. Wetterstrand, David Torrents, Ratna Shownkeen, Brian Schultz, Kim C. Worley, Richard D. Emes, John Mayer, Tom Landers, Beverley Meredith, Carol Scott, R. J. Weber, Sean R. Eddy, David Kulp, Jun Kawai, J Bailey, Fan Hsu, Diana L. Kolbe, Kirsten McLay, Marc Botcherby, Richard Mott, Tracie L. Miner, Jill P. Mesirov, Cristyn Kells, Michael A. Quail, Melanie M. Wall, Alistair G. Rust, Josep F. Abril, Ian F Korf, Peter An, Roderic Guigó, Abel Ureta-Vidal, Evan Mauceli, L. Steven Johnson, Arian F.A. Smit, Arkadiusz Kasprzyk, Michael C. Wendl, Deanna M. Church, Francis S. Collins, Wayne N. Frankel, Pallavi Eswara, Bin Ma, Robert H. Waterston, Stylianos E. Antonarakis, Edward M. Rubin, John Douglas Mcpherson, Andrew Sheridan, Megan McCarthy, Ming Li, Colin N. Dewey, Justin Deri, Rosie Levine, Matthew Jones, Sheila Dodge, Richard R. Copley, Leo Goodstadt, Shan Yang, Donna Maglott, Jamey Wierzbowski, Nick Goldman, Evgeny M. Zdobnov, Simon G. Gregory, C M Clee, Steven Leonard, Elaine R. Mardis, Simon C. Potter, Sarah Sims, Richard A. Gibbs, Mark S. Guyer, Francesca Chiaromonte, Susan Lucas, Mark Diekhans, Steve Searle, Rachel Ainscough, Jane Peterson, Emmanouil T. Dermitzakis, Robert Nicol, Lucy Matthews, Guy Slater, Adam Felsenfeld, Karen Foley, Lucinda Fulton, Tim Hubbard, Richard K. Wilson, Deana W. LaHillier, W. Richard McCombie, Johanna Thompson, Robert David, John Attwood, Anthony P. West, Jane Rogers, Evan Keibler, Lisa Cook, Raju Kucherlapati, Steven Seaman, William E. Nash, Ian J. Jackson, Jonathan Singer, Axin Hua, Tina Graves, Ted Sharpe, Dudley Wyman, Bruce W. Birren, Stuart McLaren, David Willey, A Joy, Douglas Smith, Alexandre Reymond, Paul Flicek, Simon Cawley, Richa Agarwala, Diane Gage, Evanne Trevaskis, Ginger A. Fewell, Michael R. Brent, Tracy C. Ponce, W. James Kent, Timothy Holzer, Eduardo Eyras, Michael J. O’Connor, Webb Miller, Donna M. Muzny, Andrew von Niederhausern, Inna Dubchak, Eitan E. Winter, Catherine Ucla, Arne Stabenau, Michael N. Nhan, Piero Carninci, Michele Clamp, Pavel A. Pevzner, James Meldrim, Tim Cutts, R. D. Campbell, Joy Davies, Wratko Hlavina, Elinor K. Karlsson, David Haussler, John Burton, Peer Bork, Nicole Stange-Thomann, Mikita Suyama, Mark J. Daly, Ewan Birney, Edward J. Kulbokas, Craig Pohl, James C. Mullikin, Chad Nusbaum, Genís Parra, Jade P. Vinson, Yoshihide Hayashizaki, Sante Gnerre, Eric Berry, Daniel G. Brown, Asif T. Chinwalla, Emmanuel Mongin, Robert B. Weiss, Raymond Wheeler, Andrew Kirby, Yasushi Okazaki, Lior Pachter, Ross C. Hardison, Brian Spencer, Carol J. Bult, Joanne O. Nelson, Pankaj K. Agarwal, Darren Grafham, Gustavo Glusman, Thomas A. Jones, Glenn Tesler, Simon Whelan, James Cuff, Robert S. Fulton, K F Barlow, Jörg Schultz, Matthias S. Schwartz, Alex Poliakov, Jonathan Butler, Bruce A. Roe, Angela S. Hinrichs, Alan Coulson, Kate Montgomery, Eric D. Green, Stephan Beck, Val Curwen, Krishna M. Roskin, Robert W. Plumb, Chris P. Ponting, Ralph Santos, Victor Sapojnikov, Nicolas Bray, Kymberlie H. Pepin, Charles W. Sugnet, Olivier Couronne, Ivica Letunic, Sophie Williams, Kimberly D. Delehaunty, Kerstin Lindblad-Toh, Zemin Ning, Karen Oliver, Toby Bloom, Michael Kamal, Nicholas J. Dickens, Eric S. Lander, Christine Lloyd, Donna Karolchik, Adrienne Hunt, Antonarakis, Stylianos, Couronne, Olivier, Dermitzakis, Emmanouil, and Zdobnov, Evgeny

Subjects
RNA, Untranslated, Proteome, Untranslated/genetics, Genome, Transgenic, Repetitive Sequences, Mice, Models, Neoplasms, Conserved Sequence, ddc:616, Genetics, Mice, Knockout, Base Composition, Multidisciplinary, Sex Chromosomes, Pseudogenes/genetics, Genomics, Multigene Family/genetics, Physical Chromosome Mapping, Neoplasms/genetics, CpG Islands/genetics, Proteome/genetics, Genetic Variation/genetics, Multigene Family, Mice/classification/ genetics, Models, Animal, Conserved Sequence/genetics, Sequence Analysis, Pseudogenes, Human, Genome evolution, Evolution, Sequence analysis, Knockout, Quantitative Trait Loci, Mice, Transgenic, Sex Chromosomes/genetics, Computational biology, Biology, Synteny, Chromosomes, Evolution, Molecular, Nucleic Acid/genetics, Genetic, Species Specificity, Mammalian/ genetics, Animals, Humans, Genes/genetics, Selection, Genetic, Selection, Repetitive Sequences, Nucleic Acid, Comparative genomics, Animal, Genome, Human, Molecular, Genetic Variation, DNA, Sequence Analysis, DNA, Chromosomes, Mammalian, Gene Expression Regulation, Genes, Mutagenesis, RNA, Human genome, CpG Islands, Quantitative Trait Loci/genetics, Reference genome
Abstract

The sequence of the mouse genome is a key informational tool for understanding the contents of the human genome and a key experimental tool for biomedical research. Here, we report the results of an international collaboration to produce a high-quality draft sequence of the mouse genome. We also present an initial comparative analysis of the mouse and human genomes, describing some of the insights that can be gleaned from the two sequences. We discuss topics including the analysis of the evolutionary forces shaping the size, structure and sequence of the genomes; the conservation of large-scale synteny across most of the genomes; the much lower extent of sequence orthology covering less than half of the genomes; the proportions of the genomes under selection; the number of protein-coding genes; the expansion of gene families related to reproduction and immunity; the evolution of proteins; and the identification of intraspecies polymorphism.

Published
2002

12. The DNA sequence and comparative analysis of human chromosome 20

Author

G Clarke, L M Faulkner, Jane E. Loveland, J Walsh, Kirsten McLay, G Laird, A K Babbage, J C Chapman, Sophie Palmer, C Hynds, M Earthrowl, T D Andrews, J Battles, Theologia Sarafidou, S. M. Clegg, Christine P. Bird, T P Ho, Sarah Pelan, A M Kimberley, Anthony P. West, E. Hart, Russell J. Grocock, Carol Scott, Stuart McLaren, J Lovell, M Kokkinaki, J K Kershaw, Sarah Milne, Christine Lloyd, D. M. Lloyd, R I S Ashwell, L Standring, Amanda McMurray, John Burton, A Rogosin, Yuan Chen, D Camire, Gavin K. Laird, Nigel P. Carter, David Willey, Nicholas K. Moschonas, Stephan Beck, Ruth C. Lovering, Mark T. Ross, Adam Frankish, S Lawlor, Laurens G. Wilming, I Dutta, David Bentley, Joanna Harley, R Ainscough, Matthew Jones, Susan M. Gribble, C. D. Skuce, A Thorpe, Pawandeep Dhami, L Young, Melanie M. Wall, Erik Gustafson, David Swarbreck, Douglas Smith, J Frankland, S Y Clark, C M Clee, Lucy Matthews, S Bray-Allen, A Taylor, W Burrill, Lynn Doucette-Stamm, S. Searle, Alan Tracey, J Tester, Panos Deloukas, Daniel Leongamornlert, T Nickerson, David W. Johnson, Philip Howden, Paul Wray, M. Kay, Catherine M. Rice, A Kana, H M Lee, Keith Weinstock, Kim Fechtel, Sarah E. Hunt, A I Peck, S. Whitehead, H Wang, N Sycamore, Patrick Cahill, J Bailey, Alan Coulson, E K Overton-Larty, J Y Brown, Jennifer L. Ashurst, A. V. Pearce, M Mashreghi-Mohammadi, C L Bagguley, P Garner, A J Brown, Benjamin Phillimore, W Torcasso, S Hammond, M Nguyen, J Horne, K Bates, J P Almeida, N Corby, Matthew Dunn, Darren Grafham, Ratna Shownkeen, D C Burford, A Tromans, Jane Rogers, J Garnett, Harminder Sehra, Kerstin Howe, K D Ambrose, James G. R. Gilbert, Helen Beasley, Reiner Siebert, Charles A. Steward, Chris Johnson, K M Porter, Ruby Banerjee, Marc Rubenfield, Sarah Sims, Lisa French, Paul Heath, Elizabeth J. Huckle, B Hopkins, C Griffiths, Richard Durbin, J Tsolas, Michelle Smith, and Tim Hubbard

Subjects
Genetics, Multidisciplinary, Base Sequence, Proteome, Sequence analysis, Pseudogene, Physical Chromosome Mapping, Chromosomes, Human, Pair 20, Genetic Diseases, Inborn, Computational Biology, Genetic Variation, Locus (genetics), DNA, Sequence Analysis, DNA, Biology, Contig Mapping, Mice, Gene duplication, Animals, Humans, Human genome, Chromosome 20, Segmental duplication
Abstract

The finished sequence of human chromosome 20 comprises 59,187,298 base pairs (bp) and represents 99.4% of the euchromatic DNA. A single contig of 26 megabases (Mb) spans the entire short arm, and five contigs separated by gaps totalling 320 kb span the long arm of this metacentric chromosome. An additional 234,339 bp of sequence has been determined within the pericentromeric region of the long arm. We annotated 727 genes and 168 pseudogenes in the sequence. About 64% of these genes have a 5' and a 3' untranslated region and a complete open reading frame. Comparative analysis of the sequence of chromosome 20 to whole-genome shotgun-sequence data of two other vertebrates, the mouse Mus musculus and the puffer fish Tetraodon nigroviridis, provides an independent measure of the efficiency of gene annotation, and indicates that this analysis may account for more than 95% of all coding exons and almost all genes.

Published
2002

13. Out‐of‐Pocket

Author

David Willey

Subjects
Strategy and Management, Management Information Systems
Abstract

Craig Ahlstrom has never met Peter Magowan. But he wants his job.

Published
1993
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14. A map of human genome sequence variation containing 1.42 million single nucleotide polymorphisms

Author

Lucinda Fulton, LaDeana W. Hillier, Michael C. Zody, John M. Higgins, Beverley J. Mortimore, Brian Schultz, David Willey, Lisa Cook, Lincoln Stein, Lauren Linton, Pui-Yan Kwok, Ravi Sachidanandam, Nicole Stange-Thomann, Charlotte G. Cole, Jennifer Baldwin, James C. Mullikin, David R. Bentley, Penny Coggill, Brian Gilman, Ruth Davenport, John Douglas Mcpherson, Steven Schmidt, Michael Dante, Steve Sherry, David Altshuler, William J. Van Etten, Catherine M. Rice, Jerzy M. Kakol, Sarah E. Hunt, Stephen F. Schaffner, Robert H. Waterston, Elaine R. Mardis, Brendan Blumenstiel, Eric S. Lander, David Reich, Mark J. Daly, Zemin Ning, Jane Rogers, Gabor T. Marth, Raymond T. Yeh, and David Weissman

Subjects
Genetics, Multidisciplinary, dbSNP, Genome, Human, Nucleotides, Genetics, Medical, Chromosome Mapping, Genetic Variation, Genome project, Tag SNP, Biology, Molecular Inversion Probe, Polymorphism, Single Nucleotide, SNP genotyping, Genetics, Population, Humans, Human genome, Reference genome, SNP array
Abstract

We describe a map of 1.42 million single nucleotide polymorphisms (SNPs) distributed throughout the human genome, providing an average density on available sequence of one SNP every 1.9 kilobases. These SNPs were primarily discovered by two projects: The SNP Consortium and the analysis of clone overlaps by the International Human Genome Sequencing Consortium. The map integrates all publicly available SNPs with described genes and other genomic features. We estimate that 60,000 SNPs fall within exon (coding and untranslated regions), and 85% of exons are within 5 kb of the nearest SNP. Nucleotide diversity varies greatly across the genome, in a manner broadly consistent with a standard population genetic model of human history. This high-density SNP map provides a public resource for defining haplotype variation across the genome, and should help to identify biomedically important genes for diagnosis and therapy.

Published
2001

15. Citrobacter rodentium is an Unstable Pathogen Showing Evidence of Significant Genomic Flux

Author

Carol Churcher, Rita E. Monson, Robert A. Kingsley, Siouxsie Wiles, Gordon Dougan, Julian Parkhill, Theresa Feltwell, Gad Frankel, Jyoti S. Choudhary, Richard Bulgin, Craig Corton, Nicola Lennard, Richard Rance, Nicola K. Petty, Lu Yu, George P. C. Salmond, Nicholas R. Thomson, Maria Fookes, David Harris, Satheesh Nair, Thomas M. Keane, David Willey, Michael A. Quail, Simon Clare, Derek Pickard, Ana Luisa Toribio, Kevin J. Roberts, David Goulding, Parkhill, Julian [0000-0002-7069-5958], Dougan, Gordon [0000-0003-0022-965X], Salmond, George [0000-0002-5197-2198], and Apollo - University of Cambridge Repository

Subjects
Prophages, Genome, Mice, Citrobacter rodentium, Gram Negative, Genome Sequencing, Biology (General), Genome Evolution, Gene Rearrangement, Genetics, Escherichia Coli, 0303 health sciences, Virulence, Enterobacteriaceae Infections, Genomics, Gene Pool, Electrophoresis, Gel, Pulsed-Field, Bacterial Pathogens, Host-Pathogen Interaction, Female, Sequence Analysis, Plasmids, Research Article, DNA, Bacterial, Gene Flow, QH301-705.5, Immunology, Biology, Genome Complexity, digestive system, Microbiology, Genomic Instability, 03 medical and health sciences, Virology, Animals, Humans, Molecular Biology, Prophage, 030304 developmental biology, Comparative genomics, Whole genome sequencing, Evolutionary Biology, Bacterial Evolution, 030306 microbiology, Gene Expression Profiling, Computational Biology, Genomic Evolution, Bacteriology, Sequence Analysis, DNA, Gene rearrangement, RC581-607, Comparative Genomics, Organismal Evolution, Interspersed Repetitive Sequences, Mice, Inbred C57BL, Disease Models, Animal, Microbial Evolution, Mutation, Genetic Polymorphism, Parasitology, Immunologic diseases. Allergy, Mobile genetic elements, Genome, Bacterial, Population Genetics
Abstract

Citrobacter rodentium is a natural mouse pathogen that causes attaching and effacing (A/E) lesions. It shares a common virulence strategy with the clinically significant human A/E pathogens enteropathogenic E. coli (EPEC) and enterohaemorrhagic E. coli (EHEC) and is widely used to model this route of pathogenesis. We previously reported the complete genome sequence of C. rodentium ICC168, where we found that the genome displayed many characteristics of a newly evolved pathogen. In this study, through PFGE, sequencing of isolates showing variation, whole genome transcriptome analysis and examination of the mobile genetic elements, we found that, consistent with our previous hypothesis, the genome of C. rodentium is unstable as a result of repeat-mediated, large-scale genome recombination and because of active transposition of mobile genetic elements such as the prophages. We sequenced an additional C. rodentium strain, EX-33, to reveal that the reference strain ICC168 is representative of the species and that most of the inactivating mutations were common to both isolates and likely to have occurred early on in the evolution of this pathogen. We draw parallels with the evolution of other bacterial pathogens and conclude that C. rodentium is a recently evolved pathogen that may have emerged alongside the development of inbred mice as a model for human disease., Author Summary The pathogenic bacterium Citrobacter rodentium naturally infects mice using a mechanism similar to those employed by certain strains of E. coli that cause severe gastro-intestinal infections in humans. As such it is an important model organism for human disease research. We previously sequenced the genome of C. rodentium strain ICC168 and found that it had many features in common with other bacterial pathogens that have recently adapted to live in a new environment and colonise new hosts. In this study, we sequenced the genome of an additional strain of C. rodentium that was independently isolated on a different continent, and found that the two strains were remarkably similar. In addition, we investigated several C. rodentium isolates and showed that the genome is unstable, existing in multiple conformations within a single population due to genomic inversions, recombination between repetitive sequences, and horizontally acquired DNA that is mobile within the genome. We conclude that C. rodentium recently evolved to become a pathogen of mice, possibly concurrently with the development of mouse models for human diseases, and that it is still adapting to its new environment.

Published
2011
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16. Star tech

Author

David Willey

Subjects
Technology, Computer Systems, Strategy and Management, Planning Techniques, United States, Management Information Systems, Information Systems
Abstract

The mission? To sensibly go where many have gone before--into the realm of information technology, where applications often outnumber sound business reasons to use them. If you've never been, don't believe everything you hear. Mainframes may be useful after all, and even widespread technologies don't hold all the answers.

Published
1993

17. Erratum to 'Modelling human exposures to air pollution control (APC) residues released from landfills in England and Wales' [Environment International 32 (2006) 500–509]

Author

Christopher Macleod, Ian D. Martin, Simon J. T. Pollard, Racquel Duarte-Davidson, Ji Ping Shi, Gillian H. Drew, Betty Ng, David Willey, and Bernard Fisher

Subjects
Waste management, Environmental protection, Air pollution, medicine, Environmental science, medicine.disease_cause, General Environmental Science
Published
2007
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18. [Untitled]

Author

Lucy Matthews, Syed Sufyan Hussain, Matthew E. Hurles, and David Willey

Subjects
Genetics, 0303 health sciences, Concerted evolution, Chromosomal rearrangement, Biology, Y chromosome, 03 medical and health sciences, 0302 clinical medicine, Evolutionary biology, Gene duplication, Human genome, Gene conversion, Homologous recombination, 030217 neurology & neurosurgery, 030304 developmental biology, Sequence (medicine)
Abstract

Background: The origins of the recombination hotspots that are a common feature of both allelic and non-allelic homologous recombination in the human genome are poorly understood. We have investigated, by comparative sequencing, the evolution of two hotspots of non-allelic homologous recombination on the Y chromosome that lie within paralogous sequences known to sponsor deletions resulting in male infertility. Results: These recombination hotspots are characterized by signatures of concerted evolution, which indicate that gene conversion between paralogs has been predominant in shaping their recent evolution. By contrast, the paralogous sequences that surround the hotspots exhibit little evidence of gene conversion. A second feature of these rearrangement hotspots is the extreme interspecific sequence divergence (around 2.5%) that places them among the most divergent orthologous sequences between humans and chimpanzees. Conclusions: Several hominid-specific gene conversion events have rendered these hotspots better substrates for chromosomal rearrangements in humans than in chimpanzees or gorillas. Monte Carlo simulations of sequence evolution suggest that extreme sequence divergence is a direct consequence of gene conversion between paralogs. We propose that the coincidence of signatures of concerted evolution and recurrent breakpoints of chromosomal rearrangement (mapped at the sequence level) may enable the identification of putative rearrangement hotspots from analysis of comparative sequences from great apes.

Published
2004
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21. Finishing the finished human chromosome 22 sequence

Author

Zemin Ning, Karen Oliver, Fengtang Yang, O. T. McCann, David Beare, David Willey, Susan M. Gribble, Charlotte G. Cole, John E. Collins, Ian Dunham, Karen McLaren, and Jane Rogers

Subjects
Genetics, Chromosomes, Artificial, Bacterial, 0303 health sciences, Bacterial artificial chromosome, Base Sequence, Euchromatin, Genome, Human, Sequence analysis, Chromosomes, Human, Pair 22, Research, Chromosome Mapping, Sequence Analysis, DNA, Biology, Genome, Human genetics, 03 medical and health sciences, 0302 clinical medicine, Humans, Human genome, Chromosome 22, 030217 neurology & neurosurgery, 030304 developmental biology, Sequence (medicine)
Abstract

A combination of approaches was used to close 8 of the 11 gaps in the original sequence of human chromosome 22, and to generate a total 1.018 Mb of new sequence., Background Although the human genome sequence was declared complete in 2004, the sequence was interrupted by 341 gaps of which 308 lay in an estimated approximately 28 Mb of euchromatin. While these gaps constitute only approximately 1% of the sequence, knowledge of the full complement of human genes and regulatory elements is incomplete without their sequences. Results We have used a combination of conventional chromosome walking (aided by the availability of end sequences) in fosmid and bacterial artificial chromosome (BAC) libraries, whole chromosome shotgun sequencing, comparative genome analysis and long PCR to finish 8 of the 11 gaps in the initial chromosome 22 sequence. In addition, we have patched four regions of the initial sequence where the original clones were found to be deleted, or contained a deletion allele of a known gene, with a further 126 kb of new sequence. Over 1.018 Mb of new sequence has been generated to extend into and close the gaps, and we have annotated 16 new or extended gene structures and one pseudogene. Conclusion Thus, we have made significant progress to completing the sequence of the euchromatic regions of human chromosome 22 using a combination of detailed approaches. Our experience suggests that substantial work remains to close the outstanding gaps in the human genome sequence.

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