Support for faster and more adaptive Z chromosome evolution in two divergent lepidopteran lineages().

Support for faster and more adaptive Z chromosome evolution in two divergent lepidopteran lineages().
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DOI:
10.1111/evo.14341
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发表时间:
2022-03
期刊:
Evolution; international journal of organic evolution
影响因子:
--
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其他
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人们通常观察到Z或X染色体的分歧率大于常染色体,但这种模式的进化原因不同,来自不同分类群的经验结果也不同。即使在飞蛾和蝴蝶(鳞翅目)中,通常共享一个单一来源的Z染色体,少数现有的研究也支持Z染色体更快或更适应的进化,这取决于所分析的物种。在这里,我们研究了另外两个鳞翅目物种的Z染色体的分子进化:卡罗莱纳狮身人面像蛾和帝王蝶,后者拥有最近的染色体融合,产生了一段新的Z-连锁DNA。我们发现在两个物种中都有更快和更适应的Z染色体进化的证据,尽管这种影响在帝王性染色体的neo-Z部分最强。与预期的Z染色体相比,neo-Z没有那么偏向男性,而偏向女性和偏向女性的基因在这里驱动着适应性进化的信号。总之,这些结果表明,偏向男性的基因积累和单倍体选择对长期适应速度具有相反的影响,这可能有助于解释先前发现的差异以及鳞翅目新性染色体的反复进化。
The rateof divergence for Z or X chromosomes is usually observed to be greater than autosomes, but the proposed evolutionary causes for this pattern vary, as do empirical results from diverse taxa. Even among moths and butterflies (Lepidoptera), which generally share a single‐origin Z chromosome, the handful of available studies give mixed support for faster or more adaptive evolution of the Z chromosome, depending on the species assayed. Here, we examine the molecular evolution of Z chromosomes in two additional lepidopteran species: the Carolina sphinx moth and the monarch butterfly, the latter of which possesses a recent chromosomal fusion yielding a segment of newly Z‐linked DNA. We find evidence for both faster and more adaptive Z chromosome evolution in both species, although this effect is strongest in the neo‐Z portion of the monarch sex chromosome. The neo‐Z is less male‐biased than expected of a Z chromosome, and unbiased and female‐biased genes drive the signal for adaptive evolution here. Together these results suggest that male‐biased gene accumulation and haploid selection have opposing effects on long‐term rates of adaptation and may help explain the discrepancies in previous findings as well as the repeated evolution of neo‐sex chromosomes in Lepidoptera.
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期刊: G3 (Bethesda, Md.)
影响因子: --
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影响因子: 1.2
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影响因子: 10.7
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