Intense sperm-mediated sexual conflict promotes reproductive isolation in Caenorhabditis nematodes.
Intense sperm-mediated sexual conflict promotes reproductive isolation in Caenorhabditis nematodes.
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DOI：
10.1371/journal.pbio.1001915
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发表时间：
2014-07
期刊：
影响因子：
9.8
通讯作者：
Haag ES
中科院分区：
文献类型：
--
作者：
Ting JJ;Woodruff GC;Leung G;Shin NR;Cutter AD;Haag ES
来自其他物种的精子侵入雌性组织，导致不育和死亡，有助于保持线虫物种边界的完整。两性之间在生殖利益上的冲突可以推动生殖特征的快速进化，促进物种形成。在这里，我们证明了隐杆线虫之间的种间交配使母系个体绝育。男性诱导的伤害的主要影响者是精子细胞，它们通过取代同种精子，侵入卵巢，有时破坏性腺渗透到其他组织，从而导致不育和缩短寿命。这种精子介导的伤害在物种中普遍存在，但其程度的特殊性暗示了物种内性对抗共同进化的独立历史和生殖模式的差异（自受精雌雄同体与雌性）决定了其严重程度。与这一结论相一致的是，在雄性异株物种中，雌雄同体更容易受到伤害，雄性更温和，或者两者兼而有之。同种交配的分类交配模式和低侵袭性精子发生率表明，持续的种内性冲突导致物种间生殖不相容。两性有不同的生殖利益，这种差异引起的冲突可以推动生殖特征的快速进化，促进物种形成。在这里，我们描述了一个独特的生殖屏障在隐杆线虫是由精子诱导。我们发现物种之间的交配可以使母虫不育，甚至导致过早死亡，我们可以将这种现象直接归因于精子本身。来自其他物种的精子可以取代来自同一物种的精子，在某些情况下，可以侵入母体生殖系统的不适当部分，甚至侵入其非生殖组织。我们发现，与其他物种的雄性交配对雌性的伤害远远大于同一物种内的交配。总的来说，我们的观察结果与物种内持续存在的性别冲突是一致的，这是不同雄性配子之间精子竞争的副产品。最后，分类交配模式表明，在这类动物中，交配行为降低了昂贵的物种间交配的可能性。这些发现支持了性选择和配子相互作用对物种间生殖边界的重要作用，正如进化论所预测的那样。
Sperm from other species invade female tissues to cause sterility and death, helping to keep nematode species boundaries intact. Conflict between the sexes over reproductive interests can drive rapid evolution of reproductive traits and promote speciation. Here we show that inter-species mating between Caenorhabditis nematodes sterilizes maternal individuals. The principal effectors of male-induced harm are sperm cells, which induce sterility and shorten lifespan by displacing conspecific sperm, invading the ovary, and sometimes breaching the gonad to infiltrate other tissues. This sperm-mediated harm is pervasive across species, but idiosyncrasies in its magnitude implicate both independent histories of sexually antagonistic coevolution within species and differences in reproductive mode (self-fertilizing hermaphrodites versus females) in determining its severity. Consistent with this conclusion, in androdioecious species the hermaphrodites are more vulnerable, the males more benign, or both. Patterns of assortative mating and a low incidence of invasive sperm occurring with conspecific mating are indicative of ongoing intra-specific sexual conflict that results in inter-species reproductive incompatibility. The sexes have divergent reproductive interests, and conflict arising from this disparity can drive the rapid evolution of reproductive traits and promote speciation. Here we describe a unique reproductive barrier in Caenorhabditis nematodes that is induced by sperm. We found that mating between species can sterilize maternal worms and even cause premature death, and we were able to attribute this phenomenon directly to the sperm themselves. Sperm from other species can displace sperm from the same species and, in some cases, can invade inappropriate parts of the maternal reproductive system and even their non-reproductive tissues. We find that mating to males of another species harms females far more than does within-species mating. Overall, our observations are consistent with ongoing sexual conflict between the sexes within species, arising as a byproduct of sperm competition among the gametes of different males. Finally, patterns of assortative mating indicate that mating behaviours that reduce the likelihood of costly inter-species mating have evolved in this group of animals. These findings support an important role of sexual selection and gametic interactions contributing to reproductive boundaries between species, as predicted by evolutionary theory.
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影响因子：
16.8
作者：
EBERHARD, WG;CORDERO, C
通讯作者：
CORDERO, C
偏远的热带雨林中caenorhabditis的物种丰富度，分布和遗传多样性。
影响因子：
3.4
作者：
Félix MA;Jovelin R;Ferrari C;Han S;Cho YR;Andersen EC;Cutter AD;Braendle C
通讯作者：
Braendle C
DOI：
10.1016/j.cub.2011.07.034
发表时间：
2011-08-23
期刊：
Current biology : CB
影响因子：
--
作者：
Baldi C;Viviano J;Ellis RE
通讯作者：
Ellis RE
影响因子：
2.7
作者：
Edmonds JW;McKinney SL;Prasain JK;Miller MA
通讯作者：
Miller MA
影响因子：
3.3
作者：
Garcia, L. Rene;LeBoeuf, Brigitte;Koo, Pamela
通讯作者：
Koo, Pamela