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A BAC contig map over the proximal ∼3.3 Mb region of horse chromosome 21
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A BAC contig map over the proximal ∼3.3 Mb region of horse chromosome 21
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A BAC contig map over the proximal ∼3.3 Mb region of horse chromosome 21
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Journal Article
A BAC contig map over the proximal ∼3.3 Mb region of horse chromosome 21
2008
Overview
A total of 207 BAC clones containing 155 loci were isolated and arranged into a map of linearly ordered overlapping clones over the proximal part of horse chromosome 21 (ECA21), which corresponds to the proximal half of the short arm of human chromosome 19 (HSA19p) and part of HSA5. The clones form two contigs – each corresponding to the respective human chromosomes – that are estimated to be separated by a gap of ∼200 kb. Of the 155 markers present in the two contigs, 141 (33 genes and 108 STS) were generated and mapped in this study. The BACs provide a 4–5× coverage of the region and span an estimated length of ∼3.3 Mb. The region presently contains one mapped marker per 22 kb on average, which represents a major improvement over the previous resolution of one marker per 380 kb obtained through the generation of a dense RH map for this segment. Dual color fluorescence in situ hybridization on metaphase and interphase chromosomes verified the relative order of some of the BACs and helped to orient them accurately in the contigs. Despite having similar gene order and content, the equine region covered by the contigs appears to be distinctly smaller than the corresponding region in human (3.3 Mb vs. 5.5–6 Mb) because the latter harbors a host of repetitive elements and gene families unique to humans/primates. Considering limited representation of the region in the latest version of the horse whole genome sequence EquCab2, the dense map developed in this study will prove useful for the assembly and annotation of the sequence data on ECA21 and will be instrumental in rapid search and isolation of candidate genes for traits mapped to this region.
