title: Molecular characterization of a meiotic recombinational hotspot enhancing homologous equal crossing-over.
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.
mesh_terms: D000818:Animals; D001482:Base Composition; D001483:Base Sequence; D003434:Crossing Over, Genetic; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism*; D006239:Haplotypes; D008285:Major Histocompatibility Complex; D008540:Meiosis; D051379:Mice; D009693:Nucleic Acid Hybridization
chemical_list: D004274:DNA, Recombinant; D004262:DNA Restriction Enzymes