Sexual preference of meiotic recombination within the H-2 complex

The recombination frequency between the H-2K and H-2D marker loci in male mice was measured using heterozygotes that carry the H-2 ^wm7 haplotype derived from the Japanese wild mouse and common H-2 haplotypes derived from inbred mice. Previous mating experiments in which backcross progeny of heterozygous females were screened demonstrated that the H-2 ^2m7 displays marked enhancement of recombination within the H-2 complex. In contrast to recombination in female mice, no enhancement of recombination was observed during male meiosis in the present study. Thus, it appeared that enhancement of recombination is specific to female mice. A genealogical study of recombination indicated that the postmeiotic stage is not involved in the generation of sexual preference of enhancement of recombination, suggesting that the preference is meiotic-drive and that a female-specific mechanism is involved in meiotic recombination mediated by the H-2 ^wm7 haplotype.