A test of genetic models for the evolutionary maintenance of same-sex sexual behaviour.
A test of genetic models for the evolutionary maintenance of same-sex sexual behaviour.
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对同性性行为进化维持的遗传模型的测试。
DOI：
10.1098/rspb.2015.0429
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hoskins JL
中科院分区：
文献类型：
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作者：
Hoskins JL
同性性行为（SSB）的进化维持受到越来越多的关注，因为它被认为是一个进化悖论。SSB的遗传基础在非人类动物中几乎完全未知，尽管这是理解其持久性的关键。最近的理论工作产生了广泛适用的预测集中在两个遗传模型的SSB：超显性和性拮抗。使用果蝇，我们分析了自然的遗传变异的男性SSB和经验测试的预测模式的遗传和健身后果的等位基因影响其表达。我们筛选了50个来自野生种群的雄性-雄性求爱和交配行为的近交系，并检查了超显性和拮抗生殖力选择的证据线之间的杂交。品系间一致的变异揭示了SSB的遗传变异，但遗传变异的性质是复杂的。表型和健身的变化是一致的超显性下的预期，虽然预测的性拮抗模型也得到了支持。我们发现了一个意想不到的和强大的父系SSB的表达效果，这表明可能的Y-连锁的性状。我们的研究结果告知进化的遗传机制，可能会保持较低的，但持续观察到的水平的男性SSB inD.黑腹，但强调需要更广泛的分类表示在其进化原因的研究。
The evolutionary maintenance of same-sex sexual behaviour (SSB) has received increasing attention because it is perceived to be an evolutionary paradox. The genetic basis of SSB is almost wholly unknown in non-human animals, though this is key to understanding its persistence. Recent theoretical work has yielded broadly applicable predictions centred on two genetic models for SSB: overdominance and sexual antagonism. UsingDrosophila melanogaster, we assayed natural genetic variation for male SSB and empirically tested predictions about the mode of inheritance and fitness consequences of alleles influencing its expression. We screened 50 inbred lines derived from a wild population for male–male courtship and copulation behaviour, and examined crosses between the lines for evidence of overdominance and antagonistic fecundity selection. Consistent variation among lines revealed heritable genetic variation for SSB, but the nature of the genetic variation was complex. Phenotypic and fitness variation was consistent with expectations under overdominance, although predictions of the sexual antagonism model were also supported. We found an unexpected and strong paternal effect on the expression of SSB, suggesting possible Y-linkage of the trait. Our results inform evolutionary genetic mechanisms that might maintain low but persistently observed levels of male SSB inD. melanogaster, but highlight a need for broader taxonomic representation in studies of its evolutionary causes.