Divergent selection on opsins drives incipient speciation in Lake Victoria cichlids.

Divergent selection on opsins drives incipient speciation in Lake Victoria cichlids.
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DOI:
10.1371/journal.pbio.0040433
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发表时间:
2006-12
期刊:
影响因子:
9.8
通讯作者:
Okada N
Okada N
中科院分区:
生物学1区
文献类型:
--
作者:
Terai Y;Seehausen O;Sasaki T;Takahashi K;Mizoiri S;Sugawara T;Sato T;Watanabe M;Konijnendijk N;Mrosso HD;Tachida H;Imai H;Shichida Y;Okada N

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分化的自然选择作用于生态性状,也影响配偶的选择,是生态物种形成理论的一个关键因素,但据我们所知,以前还没有在分子基因水平上得到证明。在这里,我们展示了在一个影响两个属的基因的强烈差异选择下,两个叶蝉属的平行进化。强烈发散的自然选择将视蛋白固定在环境梯度的相反两端,具有不同的预测光吸收特性。通过表达它们和测量吸光度,我们表明相互固定使种群适应发散的光环境。视觉系统的不同进化与雄性繁殖着色的不同一致,与最初的生态副产品物种形成一致。在一种负责生态适应的基因中,揭示了由强烈的发散选择驱动的非洲慈鱼的快速进化。这个基因也会影响配偶的选择,因此与早期的生态副产品物种形成是一致的。
Divergent natural selection acting on ecological traits, which also affect mate choice, is a key element of ecological speciation theory, but has not previously been demonstrated at the molecular gene level to our knowledge. Here we demonstrate parallel evolution in two cichlid genera under strong divergent selection in a gene that affects both. Strong divergent natural selection fixed opsin proteins with different predicted light absorbance properties at opposite ends of an environmental gradient. By expressing them and measuring absorbance, we show that the reciprocal fixation adapts populations to divergent light environments. The divergent evolution of the visual system coincides with divergence in male breeding coloration, consistent with incipient ecological by-product speciation. The rapid evolution of African cichlid fish driven by strong divergent selection is revealed in a gene that is responsible for ecological adaptation. This gene also affects mate choice and is thus consistent with incipient ecological by-product speciation.
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