INTRALOCUS SEXUAL CONFLICT AND THE GENETIC ARCHITECTURE OF SEXUALLY DIMORPHIC TRAITS IN PROCHYLIZA XANTHOSTOMA (DIPTERA: PIOPHILIDAE)
INTRALOCUS SEXUAL CONFLICT AND THE GENETIC ARCHITECTURE OF SEXUALLY DIMORPHIC TRAITS IN PROCHYLIZA XANTHOSTOMA (DIPTERA: PIOPHILIDAE)
复制标题
黄口蝇（双翅目：PIOPHILIDAE）的位内性冲突和性二态性状的遗传结构
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
L. Rowe
中科院分区：
文献类型：
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作者：
R. Bonduriansky;L. Rowe
摘要由于男性和女性的同源特征可能有共同的遗传基础，因此性别特异性选择（通常由一种性别的性选择产生）可能会产生一场进化拉锯战，称为基因座内性冲突，这将限制适应性差异性别。理论表明，基因座内的性冲突可以通过减少性间遗传相关（rMF）来减轻，预测rMF和性二型性之间的负协变。此外，最近的工作表明，选择应该有利于减少表达的等位基因遗传自异性父母（间性遗传）的性状受到基因座内性冲突。对于雄性在性选择下的性状，这应该表现为降低的母系遗传力，或者当冲突严重时，表现为降低的两性后代通过异性亲本的遗传力。然而，由于我们不知道这些假设的进化反应实际上能进行多远，因此，作为适应性进化的长期约束，基因座内性冲突的重要性仍然不清楚。在这项研究中，我们调查了性和非性形态性状的遗传结构，在Prochyliza xanthostoma。最低的rMF和最大的二型性表现为两个性别性状（头长和触角长），在所有性状中，性二型性的程度与rMF呈负相关。此外，性特征表现出降低的母体遗传力，和最强烈的二态性特征（触角长度）是遗传的，只有通过同性父母在后代的两性。我们的研究结果支持了这一理论，并表明基因座内的性冲突可以通过基因组适应来解决。需要进一步的工作，以确定这些模式的基本机制。
Abstract Because homologous traits of males and females are likely to have a common genetic basis, sex-specific selection (often resulting from sexual selection on one sex) may generate an evolutionary tug-of-war known as intralocus sexual conflict, which will constrain the adaptive divergence of the sexes. Theory suggests that intralocus sexual conflict can be mitigated through reduction of the intersexual genetic correlation (rMF), predicting negative covariation between rMF and sexual dimorphism. In addition, recent work showed that selection should favor reduced expression of alleles inherited from the opposite-sex parent (intersexual inheritance) in traits subject to intralocus sexual conflict. For traits under sexual selection in males, this should be manifested either in reduced maternal heritability or, when conflict is severe, in reduced heritability through the opposite-sex parent in offspring of both sexes. However, because we do not know how far these hypothesized evolutionary responses can actually proceed, the importance of intralocus sexual conflict as a long-term constraint on adaptive evolution remains unclear. In this study, we investigated the genetic architecture of sexual and nonsexual morphological traits in Prochyliza xanthostoma. The lowest rMF and greatest dimorphism were exhibited by two sexual traits (head length and antenna length) and, among all traits, the degree of sexual dimorphism was correlated negatively with rMF. Moreover, sexual traits exhibited reduced maternal heritabilities, and the most strongly dimorphic sexual trait (antenna length) was heritable only through the same-sex parent in offspring of both sexes. Our results support theory and suggest that intralocus sexual conflict can be resolved substantially by genomic adaptation. Further work is required to identify the proximate mechanisms underlying these patterns.
影响因子：
3.3
作者：
D. Houle
通讯作者：
D. Houle