Studies of the species barrier between Drosophila subobscura and D-madeirensis V: the importance of sex-linked inversion in preserving species identity
Studies of the species barrier between Drosophila subobscura and D-madeirensis V: the importance of sex-linked inversion in preserving species identity
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DOI：
10.1111/j.1420-9101.2011.02263.x
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发表时间：
2011-06-01
影响因子：
2.1
通讯作者：
Nobrega, C.
中科院分区：
文献类型：
--
作者：
Khadem, M.;Camacho, R.;Nobrega, C.
已知X染色体对与合子后生殖隔离相关的性状产生不成比例的巨大影响。还有越来越多的证据表明，重组减少（如倒位）的染色体区域在维持密切相关物种的身份方面发挥着重要作用。利用分子标记，我们研究的影响，不同区域的X染色体上确定的杂交性状（活力，睾丸大小，精子活力和形态异常）之间的果蝇madeirensis和果蝇subobscura杂交雄性。确定了X染色体中A2倒位内的区域在所有杂交性状中的优势效应。其它标记区域对杂种优势的影响较弱或仅对杂种优势的部分性状有影响。我们的研究结果证实了性连锁染色体倒位在保持物种的身份与不完全生殖隔离的关键作用。用于进行杂交的亲本系的特定基因组组成对杂交适合度有很大影响。
The X chromosome is known to exert a disproportionately large effect on characters related to post-zygotic reproductive isolation. There is also growing evidence about the important role of the chromosomal regions with reduced recombination (such as inversions) in maintaining the identity of closely related species. Using molecular markers, we examine the effect of different regions of the X chromosome on determination of hybrid traits (viability, testes size, sperm motility and morphological anomalies) in hybrid males between Drosophila madeirensis and Drosophila subobscura. The preponderant effect of a region localized inside the A2 inversion in the X chromosome in all hybrid traits is identified. Other marked regions exert a weaker influence or only influence some of the hybrid trait. Our results confirm the crucial role of sex-linked chromosomal inversion in preserving the identity of species with incomplete reproductive isolation. The specific genomic make-up of parental lines used to perform crosses has a great effect on hybrid fitness.