Abstract
Using immunolocalization of the mismatch-repair protein MLH1 in oocytes and spermatocytes of the Japanese quail and the zebra finch, we estimated the average amount of recombination in each sex of both species. In each case the number of MLH1 foci is statistically equivalent in males and females and the resulting sex-averaged map lengths are 2800 cM in the Japanese quail and 2275 cM in the zebra finch. In the Japanese quail the MLH1 foci are regularly distributed along the macrobivalents and recombination rates per Mb pair are somewhat lower compared to the chicken. In the zebra finch the MLH1 foci on the macrobivalents are substantially reduced in number relative to the Japanese quail and they show remarkable localization in both sexes. It is proposed that the lack of sex-dependent differences in recombination might be an extended feature among birds and that the different recombination patterns observed here reflect different controls of crossing over in spite of similarities regarding karyotypic asymmetry and DNA content. We discussed possible causes of the differences between birds and mammals, which show sex-dependent recombination differences.
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Calderón, P.L., Pigozzi, M.I. MLH1-focus mapping in birds shows equal recombination between sexes and diversity of crossover patterns. Chromosome Res 14, 605–612 (2006). https://doi.org/10.1007/s10577-006-1059-0
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DOI: https://doi.org/10.1007/s10577-006-1059-0