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首页> 外文期刊>Journal of genetics >Male-limited evolution suggests no extant intralocus sexual conflict over the sexually dimorphic cuticular hydrocarbons of Drosophila melanogaster
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Male-limited evolution suggests no extant intralocus sexual conflict over the sexually dimorphic cuticular hydrocarbons of Drosophila melanogaster

机译：男性有限的进化表明，果蝇的性二态表皮碳氢化合物没有现存的性内冲突。

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Sexually dimorphic traits are likely to have evolved through sexually antagonistic selection. However, recent empirical data suggest that intralocus sexual conflict often persists, even when traits have diverged between males and females. This implies that evolved dimorphism is often incomplete in resolving intralocus conflict, providing a mechanism for the maintenance of genetic variance in fitness-related traits. We used experimental evolution in Drosophila melanogaster to directly test for ongoing conflict over a suite of sexually dimorphic cuticular hydrocarbons (CHCs) that are likely targets of sex-specific selection. Using a set of experimental populations in which the transmission of genetic material had been restricted to males for 82 generations, we show that CHCs did not evolve, providing experimental evidence for the absence of current intralocus sexual conflict over these traits. The absence of ongoing conflict could indicate that CHCs have never been the target of sexually antagonistic selection, although this would require the existing dimorphism to have evolved via completely sex-linked mutations or as a result of former, but now absent, pleiotropic effects of the underlying loci on another trait under sexually antagonistic selection. An alternative interpretation, and which we believe to be more likely, is that the extensive CHC sexual dimorphism is the result of past intralocus sexual conflict that has been fully resolved, implying that these traits have evolved genetic independence between the sexes and that genetic variation in them is therefore maintained by alternative mechanisms. This latter interpretation is consistent with the known roles of CHCs in sexual communication in this species and with previous studies suggesting the genetic independence of CHCs between males and females. Nevertheless, direct estimates of sexually antagonistic selection will be important to fully resolve these alternatives.
机译：性双态性状可能是通过性拮抗选择而演变而来的。但是，最近的经验数据表明，即使男性和女性之间的性格特征不同，场所内的性冲突也常常持续存在。这意味着进化的二态性通常在解决基因座内冲突方面是不完整的，为维持与适应性相关的性状的遗传变异提供了一种机制。我们使用果蝇的实验进化来直接测试一组性双态表皮碳氢化合物（CHC）的持续冲突，这些可能是针对性别的选择的目标。使用一组遗传物质仅限于男性传承了82代的实验种群，我们证明了CHC不会进化，为这些性状目前不存在场所内性冲突提供了实验证据。没有持续的冲突可能表明CHC从未成为性拮抗选择的目标，尽管这将要求现有的二态性通过完全的性别相关突变或由于以前但现在不存在的多效性效应而发展。性对抗选择下另一个性状的潜在基因座。另一种我们认为更可能的解释是，广泛的CHC性二态性是过去的位点内性冲突的结果，该冲突已得到完全解决，这意味着这些特征已经进化为两性之间的遗传独立性以及该性状的遗传变异。因此，它们是由替代机制维护的。后一种解释与该物种在性传播中CHC的已知作用以及先前的研究表明CHC在男性和女性之间的遗传独立性是一致的。然而，对性拮抗选择的直接估计对于充分解决这些选择很重要。

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