Angiosperm Flora of India

Next-generation sequencing and syntenic integration of flow-sorted arms of wheat chromosome 4A exposes the chromosome structure and gene content

Publication Type:Journal Article
Year of Publication:2012
Authors:Hernandez, P, Martis, M, Dorado, G, Pfeifer, M, Gálvez, S, Schaaf, S, Jouve, N, Šimková, H, Valárik, M, Doležel, J, Mayer, KFX
Journal:The Plant Journal
Date Published:2012
ISBN Number:1365-313X
Keywords:chromosome sorting, genome zipper, grass comparative genomics, Triticeae genome, Triticum, wheat genome, wheat shotgun chromosome

Wheat is the third most important crop for human nutrition in the world. The availability of high-resolution genetic and physical maps and ultimately a complete genome sequence holds great promise for breeding improved varieties to cope with increasing food demand under the conditions of changing global climate. However, the large size of the bread wheat (Triticum aestivum) genome (approximately 17 Gb/1C) and the triplication of genic sequence resulting from its hexaploid status have impeded genome sequencing of this important crop species. Here we describe the use of mitotic chromosome flow sorting to separately purify and then shotgun-sequence a pair of telocentric chromosomes that together form chromosome 4A (856 Mb/1C) of wheat. The isolation of this much reduced template and the consequent avoidance of the problem of sequence duplication, in conjunction with synteny-based comparisons with other grass genomes, have facilitated construction of an ordered gene map of chromosome 4A, embracing ≥85% of its total gene content, and have enabled precise localization of the various translocation and inversion breakpoints on chromosome 4A that differentiate it from its progenitor chromosome in the A genome diploid donor. The gene map of chromosome 4A, together with the emerging sequences of homoeologous wheat chromosome groups 4, 5 and 7, represent unique resources that will allow us to obtain new insights into the evolutionary dynamics between homoeologous chromosomes and syntenic chromosomal regions.

Short Title:The Plant Journal
Taxonomic name: 
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