The physical map of wheat chromosome 1BS provides insights into its gene space organization and evolution

Genome Biology
Dina RaatsTzion Fahima

Abstract

The wheat genome sequence is an essential tool for advanced genomic research and improvements. The generation of a high-quality wheat genome sequence is challenging due to its complex 17 Gb polyploid genome. To overcome these difficulties, sequencing through the construction of BAC-based physical maps of individual chromosomes is employed by the wheat genomics community. Here, we present the construction of the first comprehensive physical map of chromosome 1BS, and illustrate its unique gene space organization and evolution. Fingerprinted BAC clones were assembled into 57 long scaffolds, anchored and ordered with 2,438 markers, covering 83% of chromosome 1BS. The BAC-based chromosome 1BS physical map and gene order of the orthologous regions of model grass species were consistent, providing strong support for the reliability of the chromosome 1BS assembly. The gene space for chromosome 1BS spans the entire length of the chromosome arm, with 76% of the genes organized in small gene islands, accompanied by a two-fold increase in gene density from the centromere to the telomere. This study provides new evidence on common and chromosome-specific features in the organization and evolution of the wheat genome, including a non-unifor...Continue Reading

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Datasets Mentioned

BETA
A-MEXP-2314
E-MTAB-1912
ERP000446
HG752437

Methods Mentioned

BETA
flow cytometry
PCR
chip
electrophoresis
454 sequencing

Software Mentioned

Perl scripts
1S GenomeZipper
ArrayExpress
BLAST
ABI
SSRDesign Perl script
IsbpFinder
FPC
Phred
FingerPrinted Contigs ( FPC )

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