Human Molecular Genetics, 2000, Vol. 9, No. 5 725-733
© 2000 Oxford University Press
High resolution analysis of haplotype diversity and meiotic crossover in the human TAP2 recombination hotspot
Department of Genetics, University of Leicester, Leicester LE1 7RH, UK
Little is known about the nature of recombination hotspots in the human genome and the relationship between crossover activity and patterns of linkage disequilibrium. We have therefore used both haplotype analysis and direct detection of crossovers in sperm to characterize a putative recombination hotspot in the TAP2 gene within the class II region of the MHC. Haplotype diversity provided evidence for a localized hotspot within intron 2 of this gene. Sperm DNA typing using allele-specific PCR primers to selectively amplify recombinant TAP2 molecules revealed a highly localized meiotic crossover hotspot ~1.2 kb long, unusually abundant in sequence polymorphisms and flanked by DNA much less active in recombination. Sperm crossover appeared to be fully reciprocal, and almost all crossover products were simple, involving a single exchange between adjacent heterozygous markers. This hotspot appears to be much more active in female than male meiosis. No primary sequence similarities could be found between any of the very few well defined crossover hotspots in the human genome, all of which show recombinationally active domains 1–2 kb long. Direct comparison of recombination frequency and haplotype diversity in TAP2 showed that linkage disequilibrium measures were a poor predictor of crossover frequency in this region, with non-recombining markers sometimes in free association and with examples of pairs of markers spanning the recombination hotspot showing substantial or even absolute linkage disequilibrium.
+ To whom correspondence should be addressed. Tel: +44 116 252 3435; Fax: +44 116 252 3378; Email: ajj@le.ac.uk
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