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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Protein-specific manipulation of ejaculate composition in response to female mating status in Drosophila melanogaster
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Protein-specific manipulation of ejaculate composition in response to female mating status in Drosophila melanogaster

机译：果蝇对雌性交配状态的射精组成的蛋白质特异性操纵

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Female promiscuity can generate postcopulatory competition among males, but it also provides the opportunity for exploitation of rival male ejaculates. For example, in many insect species, male seminal fluid proteins (Sfps) transferred in a female's first mating stimulate increased fecundity and decreased receptivity to remat ing. Subsequent mates of females could potentially take advan tage of the effects of the first male's Sfps and strategically reduce investment in their own ejaculate. We compared postmating responses (fecundity and sexual receptivity) of Drosophila mela nogaster females after their first (virgin) matings (V), to the responses of females remating (M) 24 h after their first mating. The results show that M matings fail to boost fecundity and, thus, males are unlikely to gain fitness from transferring Sfps whose sole function—in V matings—is fecundity-stimulation. However, males can protect their likelihood of paternity in M matings through the transfer of receptivity-inhibiting Sfps. The levels of a fecundity-stimulating Sfp (ovulin) were significantly lower in M females relative to V females, at the same time point shortly after the end of mating. In contrast, the levels of a key receptivity inhibiting Sfp (sex peptide) were the same in M and V females. These results support the hypothesis that males can adaptively tailor the composition of proteins in the ejaculate, allowing a male to take advantage of the fecundity-stimulating effects of the pre vious male's ovulin, yet maintaining investment in sex peptide. Furthermore, our results demonstrate sophisticated protein-specific ejaculate manipulation.
机译：女性滥交可以在男性之间产生交配后的竞争，但也提供了利用敌对的男性射精的机会。例如，在许多昆虫物种中，在雌性的首次交配过程中转移的雄性精液蛋白（Sfps）刺激繁殖力增加，对交配的接受能力降低。女性的后续同伴可能会受益于第一个男性的Sfps的影响，并有策略地减少对自己射精的投资。我们比较了果蝇黑夜蛾雌性首次交配（V）后的交配反应（生殖力和性接受）与首次交配24小时后雌性交配（M）的交配反应。结果表明，M个交配不能提高生育力，因此，男性不可能通过转移Sfps来获得适应能力，而Sfps的唯一功能（在V交配中）是对生育力的刺激。但是，雄性可以通过抑制抑制性的Sfps转移来保护其在M交配中的亲子关系。在交配结束后不久的同一时间点，M雌性的促卵性Sfp（卵磷脂）水平显着低于V雌性。相反，在M和V雌性中，关键受体抑制性Sfp（性肽）的水平相同。这些结果支持了这样的假设：雄性可以适应性地调整射精中蛋白质的组成，从而使雄性可以利用先前雄性卵磷脂对生殖力的刺激作用，同时保持对性肽的投资。此外，我们的结果证明了复杂的蛋白质特异性射精操作。

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