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A physical map of the chicken genome
Authors:Wallis John W  Aerts Jan  Groenen Martien A M  Crooijmans Richard P M A  Layman Dan  Graves Tina A  Scheer Debra E  Kremitzki Colin  Fedele Mary J  Mudd Nancy K  Cardenas Marco  Higginbotham Jamey  Carter Jason  McGrane Rebecca  Gaige Tony  Mead Kelly  Walker Jason  Albracht Derek  Davito Jonathan  Yang Shiaw-Pyng  Leong Shin  Chinwalla Asif  Sekhon Mandeep  Wylie Kristine  Dodgson Jerry  Romanov Michael N  Cheng Hans  de Jong Pieter J  Osoegawa Kazutoyo  Nefedov Mikhail  Zhang Hongbin  McPherson John D  Krzywinski Martin  Schein Jacquie  Hillier Ladeana  Mardis Elaine R  Wilson Richard K  Warren Wesley C
Affiliation:Genome Sequencing Center, Washington University School of Medicine, Campus Box 8501, 4444 Forest Park Avenue, St Louis, Missouri 63108, USA.
Abstract:Strategies for assembling large, complex genomes have evolved to include a combination of whole-genome shotgun sequencing and hierarchal map-assisted sequencing. Whole-genome maps of all types can aid genome assemblies, generally starting with low-resolution cytogenetic maps and ending with the highest resolution of sequence. Fingerprint clone maps are based upon complete restriction enzyme digests of clones representative of the target genome, and ultimately comprise a near-contiguous path of clones across the genome. Such clone-based maps are used to validate sequence assembly order, supply long-range linking information for assembled sequences, anchor sequences to the genetic map and provide templates for closing gaps. Fingerprint maps are also a critical resource for subsequent functional genomic studies, because they provide a redundant and ordered sampling of the genome with clones. In an accompanying paper we describe the draft genome sequence of the chicken, Gallus gallus, the first species sequenced that is both a model organism and a global food source. Here we present a clone-based physical map of the chicken genome at 20-fold coverage, containing 260 contigs of overlapping clones. This map represents approximately 91% of the chicken genome and enables identification of chicken clones aligned to positions in other sequenced genomes.
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