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. 1986 Sep;5(9):2123–2129. doi: 10.1002/j.1460-2075.1986.tb04475.x

Molecular characterization of a meiotic recombinational hotspot enhancing homologous equal crossing-over.

Y Uematsu, H Kiefer, R Schulze, K Fischer-Lindahl, M Steinmetz
PMCID: PMC1167091  PMID: 3023057

Abstract

We have cloned and sequenced a meiotic recombinational hotspot between the A beta 3 and A beta 2 genes in the major histocompatibility complex (MHC) of the mouse. This recombinational hotspot in the Mus musculus castaneus cas3 haplotype was previously localized to a region of 9.5 kb of DNA in which five independent crossing-over events occurred at the unusually high frequency of 0.6%. Aside from cas3, the hotspot appears to be absent in many other MHC haplotypes. We have now confined the five recombinational breakpoints to a stretch of 3.5 kb of DNA. From the nucleotide sequence around the recombinational breakpoints, determined in the parental cas3 and b haplotypes as well as for two recombinant haplotypes, we show that the two recombinant haplotypes were generated by homologous equal crossing-over and place the breakpoints within two non-overlapping stretches of 10 and 36 bp, respectively. Comparison of the DNA sequences of the hotspot-positive cas3 and the hotspot-negative b haplotypes reveals a number of differences, in particular, a CAGA-repeat sequence which is present in CAS3 in six, but only four copies in C57BL/6 DNA. This repeat sequence is reminiscent of one in a previously characterized hotspot in the E beta gene.

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