title: Sequencing wheat chromosome arm 7BS delimits the 7BS/4AL translocation and reveals homoeologous gene conservation.
abstract: Complex Triticeae genomes pose a challenge to genome sequencing efforts due to their size and repetitive nature. Genome sequencing can reveal details of conservation and rearrangements between related genomes. We have applied Illumina second generation sequencing technology to sequence and assemble the low copy and unique regions of Triticum aestivum chromosome arm 7BS, followed by the construction of a syntenic build based on gene order in Brachypodium. We have delimited the position of a previously reported translocation between 7BS and 4AL with a resolution of one or a few genes and report approximately 13% genes from 7BS having been translocated to 4AL. An additional 13 genes are found on 7BS which appear to have originated from 4AL. The gene content of the 7DS and 7BS syntenic builds indicate a total of ~77,000 genes in wheat. Within wheat syntenic regions, 7BS and 7DS share 740 genes and a common gene conservation rate of ~39% of the genes from the corresponding regions in Brachypodium, as well as a common rate of colinearity with Brachypodium of ~60%. Comparison of wheat homoeologues revealed ~84% of genes previously identified in 7DS have a homoeologue on 7BS or 4AL. The conservation rates we have identified among wheat homoeologues and with Brachypodium provide a benchmark of homoeologous gene conservation levels for future comparative genomic analysis. The syntenic build of 7BS is publicly available at http://www.wheatgenome.info.
authors: School of Agriculture and Food Sciences and Australian Centre for Plant Functional Genomics, University of Queensland, Brisbane, QLD, 4072, Australia.
authors: Paul J
authors: PJ
authors: Berkman
authors: Adam
authors: A
authors: Skarshewski
authors: Sahana
authors: S
authors: Manoli
authors: Michał T
authors: MT
authors: Lorenc
authors: Jiri
authors: J
authors: Stiller
authors: Lars
authors: L
authors: Smits
authors: Kaitao
authors: K
authors: Lai
authors: Emma
authors: E
authors: Campbell
authors: Marie
authors: M
authors: Kubaláková
authors: Hana
authors: H
authors: Simková
authors: Jacqueline
authors: J
authors: Batley
authors: Jaroslav
authors: J
authors: Doležel
authors: Pilar
authors: P
authors: Hernandez
authors: David
authors: D
authors: Edwards
mesh_terms: D058431:Brachypodium / Q000235:genetics; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics*; D023061:Gene Order; D005828:Genetics, Population; D058977:Molecular Sequence Annotation; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D026801:Synteny / Q000235:genetics*; D014178:Translocation, Genetic / Q000235:genetics*; D014908:Triticum / Q000235:genetics*