title: A chromosome bin map of 16,000 expressed sequence tag loci and distribution of genes among the three genomes of polyploid wheat.
abstract: Because of the huge size of the common wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD) genome of 17,300 Mb, sequencing and mapping of the expressed portion is a logical first step for gene discovery. Here we report mapping of 7104 expressed sequence tag (EST) unigenes by Southern hybridization into a chromosome bin map using a set of wheat aneuploids and deletion stocks. Each EST detected a mean of 4.8 restriction fragments and 2.8 loci. More loci were mapped in the B genome (5774) than in the A (5173) or D (5146) genomes. The EST density was significantly higher for the D genome than for the A or B. In general, EST density increased relative to the physical distance from the centromere. The majority of EST-dense regions are in the distal parts of chromosomes. Most of the agronomically important genes are located in EST-dense regions. The chromosome bin map of ESTs is a unique resource for SNP analysis, comparative mapping, structural and functional analysis, and polyploid evolution, as well as providing a framework for constructing a sequence-ready, BAC-contig map of the wheat genome.
authors.affiliation: Department of Plant Pathology, Wheat Genetics Resource Center, Kansas State University, Manhattan, Kansas 66506-5502, USA.
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authors.lastname: Hossain
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authors.lastname: Kianian
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authors.lastname: Pathan
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authors.initials: DS
authors.lastname: Zhang
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authors.lastname: Nguyen
authors.forename: D-W
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authors.lastname: Choi
authors.forename: R D
authors.initials: RD
authors.lastname: Fenton
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authors.lastname: Close
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mesh_terms: D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics*; D020224:Expressed Sequence Tags; D017343:Genes, Plant; D005819:Genetic Markers; D018745:Genome, Plant; D011003:Ploidies; D040641:Quantitative Trait Loci; D016415:Sequence Alignment; D014908:Triticum / Q000235:genetics*
chemical_list: D005819:Genetic Markers