A sexually selected male weapon characterized by strong additive genetic variance and no evidence for sexually antagonistic polyphenic maintenance.
A sexually selected male weapon characterized by strong additive genetic variance and no evidence for sexually antagonistic polyphenic maintenance.
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一种性选择的男性武器，其特征是强烈的加性遗传变异，并且没有证据表明性对抗性多相维持。
DOI：
10.1093/evolut/qpad039
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Radwan,Jacek
中科院分区：
文献类型：
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作者：
Parrett,JonathanM;Łukasiewicz,Aleksandra;Chmielewski,Sebastian;Szubert-Kruszyńska,Agnieszka;Maurizio,PaulL;Grieshop,Karl;Radwan,Jacek
性选择和性对抗是生态进化过程的重要驱动力。这些过程形成的性状的进化取决于它们的遗传结构，而这一点仍然缺乏研究。在这里，我们利用球螨（Rhizoglyphus robini）的双列杂交实施定量遗传学方法，研究了雄性和雌性繁殖力具有二态性的性选择武器背后的遗传变异。先前的研究表明，这两个特征之间可能存在负遗传相关性。我们发现雄性变体表现出相当大的加性遗传方差，这不太可能仅用突变选择平衡来解释，表明可能存在大效应基因座。然而，显着程度的近交抑制也表明形态表达可能在某种程度上取决于条件，并且有害的隐性基因可以同时促进形态表达。雌性繁殖力也表现出高度的近交抑制，但雌性繁殖力的差异主要是由上位效应解释的，加性效应的贡献很小。我们发现雄性形态和雌性繁殖力之间没有显着的遗传相关性，也没有任何优势逆转的证据。该系统中雄性形态和雌性繁殖力背后的复杂遗传结构对于我们理解净化选择和性对抗选择之间的进化相互作用具有重要意义。
Sexual selection and sexual antagonism are important drivers of eco-evolutionary processes. The evolution of traits shaped by these processes depends on their genetic architecture, which remains poorly studied. Here, implementing a quantitative genetics approach using diallel crosses of the bulb mite,Rhizoglyphus robini, we investigated the genetic variance that underlies a sexually selected weapon that is dimorphic among males and female fecundity. Previous studies indicated that a negative genetic correlation between these two traits likely exists. We found male morph showed considerable additive genetic variance, which is unlikely to be explained solely by mutation-selection balance, indicating the likely presence of large-effect loci. However, a significant magnitude of inbreeding depression also indicates that morph expression is likely to be condition-dependent to some degree and that deleterious recessives can simultaneously contribute to morph expression. Female fecundity also showed a high degree of inbreeding depression, but the variance in female fecundity was mostly explained by epistatic effects, with very little contribution from additive effects. We found no significant genetic correlation, nor any evidence for dominance reversal, between male morph and female fecundity. The complex genetic architecture underlying male morph and female fecundity in this system has important implications for our understanding of the evolutionary interplay between purifying selection and sexually antagonistic selection.