Sex-specific differences in the synaptonemal complex in the genus Oreochromis (Cichlidae)
Sex-specific differences in the synaptonemal complex in the genus Oreochromis (Cichlidae)
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DOI：
10.1007/s10709-008-9280-8
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发表时间：
2009-04-01
期刊：
影响因子：
1.5
通讯作者：
Penman, David J.
中科院分区：
文献类型：
--
作者：
Campos-Ramos, Rafael;Harvey, Simon C.;Penman, David J.
对Oreochromis aureus Steindachner（具有WZ/ZZ性别决定系统）、O. mossambicus Peters和O. niloticus L.（均具有XX/XY性别决定系统）的总突触复合物（SC）长度进行了估计。卵母细胞的SC总长度均大于精母细胞（194 +/- A 30 μ m和134 +/- A 13 μ m， 187 +/- A 22 μ m和127 +/- A 17 μ m， 193 +/- A 37 μ m和144 +/- A 19 μ m）。这些性别特异性差异似乎不受性别决定系统类型的影响（金黄色葡萄球菌雌/雄总SC长度比为1.45，莫sambicus为1.47，niloticus为1.34），也与当前Oreochromis连锁图谱中缺乏任何总体性别特异性长度差异无关。虽然基于相对较少物种的数据，但在鱼类中，性别特异性SC长度和连锁图谱长度之间似乎没有一致的关系。新雄性（激素雄性化的遗传雌性）金黄色葡萄球菌和莫sambicus的总SC长度分别为138 +/- A 13 μ m和146 +/- A 13 μ m，与正常雄性的相似度大于正常雌性。这些发现与其他脊椎动物物种的数据一致，这些数据表明，表型性别，而不是基因型，决定了诸如总SC长度，交叉位置和重组模式等性状，至少对于常染色体来说是这样。
Total synaptonemal complex (SC) lengths were estimated from Oreochromis aureus Steindachner (which has a WZ/ZZ sex determination system), O. mossambicus Peters and O. niloticus L. (both of which have XX/XY sex determination systems). The total SC length in oocytes was greater than that in spermatocytes in all three species (194 +/- A 30 mu m and 134 +/- A 13 mu m, 187 +/- A 22 mu m and 127 +/- A 17 mu m, 193 +/- A 37 mu m and 144 +/- A 19 mu m, respectively). These sex-specific differences did not appear to be influenced by the type of sex determination system (the female/male total SC length ratio was 1.45 in O. aureus, 1.47 in O. mossambicus and 1.34 in O. niloticus) and do not correlate with the lack of any overall sex-specific length differences in the current Oreochromis linkage map. Although based on data from relatively few species, there appears to be no consistent relationship between sex-specific SC lengths and linkage map lengths in fish. Neomale (hormonally masculinized genetic female) O. aureus and O. mossambicus had total SC lengths of 138 +/- A 13 mu m and 146 +/- A 13 mu m respectively, more similar to normal males than to normal females. These findings agree with data from other vertebrate species that suggest that phenotypic sex, rather than genotype, determines traits such as total SC length, chiasmata position and recombination pattern, at least for the autosomes.