Meiotic abnormalities in hybrid mice of the C57BL/6J x Mus spretus cross suggest a cytogenetic basis for Haldane's rule of hybrid sterility.
Light- and electron-microscopic analyses of chromosomal pairing and recombination in F1 and first-backcross generation mice of the C57BL/6J x Mus spretus cross revealed a variety of meiotic irregularities that could contribute to meiocyte loss and infertility. Pachytene anomalies included univalency, partially paired bivalents, homolog-length inequalities, nonhomologous pairing, and associations of asynapsed autosomal segments with the X chromosome. These phenomena were most prevalent in F1 males, which are invariably sterile. Although F1 females were qualitatively fertile, breeding data indicated significant reproductive impairment. Molecular analyses of X-linked and pseudoautosomal loci in sterile and fertile backcross males revealed that the failure of X-Y pairing and recombination is correlated with heterozygosity within the pseudoautosomal regions of the X and Y chromosomes. In addition to impairing fertility, the synaptic disturbances (such as localized asynapsis and nonhomologous pairing) observed in F1 individuals can potentially alter recombinational patterns, thereby contributing to the genetic-map distortion observed with this interspecific cross. Together, the cytogenetic and reproductive data suggest that sex-related differences in the gametogenic process, quantitative differences in the incidence of synaptic irregularities in female and male meiosis, and phenomena associated with the X and Y chromosomes comprise the etiological basis of the sex-biased F1 sterility. The differential gender-related effects of these cytogenetic phenomena may constitute the underlying basis of Haldane's rule in mammals.
Hale
D W
DW
Jackson Laboratory, Bar Harbor, ME 04609.
Washburn
L L
LL
Eicher
E M
EM
D000818:Animals; D005260:Female; D006824:Hybridization, Genetic; D007246:Infertility / Q000235:genetics*; D007247:Infertility, Female / Q000235:genetics; D007248:Infertility, Male / Q000235:genetics; D008297:Male; D008540:Meiosis; D051379:Mice; D008810:Mice, Inbred C57BL; D008815:Mice, Inbred Strains; D008854:Microscopy, Electron; D012730:Sex Chromosomes; D013045:Species Specificity; D013573:Synaptonemal Complex