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- W2019619995 abstract "Some species display intersex variation in their rate of meiotic recombination, where recombination is usually suppressed in the heterogametic sex. Although no heteromorphic sex chromosomes have been detected in zebrafish (Danio rerio), genetic analysis has indicated a lower frequency of recombination in males relative to females. Our study of the meiotic recombination pattern in female zebrafish indicates that adult females have only a few meiotic oocytes that are found in groups in the ventral zone of the ovarian surface. We used antibody staining of human mutL homolog 1 (MLH1) protein to mark the sites of putative chiasmata to seek a physical basis for the pattern of recombination and its relative frequency in both sexes. We report that MLH1 foci are found mostly in distal regions of the synaptonemal complexes (SCs) in males, but tend to be more evenly distributed in females. Our cytological analysis yields a ratio of MLH1 foci per chromosome in males versus females of 1:1.55. This lower level of recombination in males is in general agreement with previously published results from linkage map analysis. However, the similar ratio of MLH1 foci per unit length of SCs in both sexes demonstrates a correlation between SC length and the frequency of recombination rather than a mechanism that suppresses recombination in males. Thus, chiasma interference seems to provide similar expression in males and females in agreement with the situation in humans, where oocytes with longer SCs display a higher level of recombination that is not a consequence of more closely spaced crossovers along the SCs." @default.
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- W2019619995 date "2008-03-05" @default.
- W2019619995 modified "2023-10-10" @default.
- W2019619995 title "Sex-specific crossover patterns in Zebrafish (Danio rerio)" @default.
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- W2019619995 doi "https://doi.org/10.1038/sj.hdy.6801091" @default.
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