Müllerian mimicry of a quantitative trait despite contrasting levels of genomic divergence and selection
Müllerian mimicry of a quantitative trait despite contrasting levels of genomic divergence and selection
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尽管基因组分歧和选择水平不同，但数量性状的缪勒拟态
DOI：
10.1101/842708
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Curran E
中科院分区：
文献类型：
--
作者：
Curran E
杂交区，在表型不同的人口满足和杂交，使洞察人口之间的差异是如何保持尽管基因流。由多个基因座控制的数量性状的差异可能需要比由少数主要效应基因座控制的性状更强的基因流动障碍。蝴蝶Heliconius erato和Heliconius melpomene是亲缘关系较远的穆勒模仿者，它们在南美洲的地理种族之间表现出翅膀颜色模式的平行差异。我们调查了种内杂交区，其中两个物种的颜色模式显示离散的色素沉着的变化，和虹彩蓝的数量变化。我们测试了杂交区之间的分化是否由于间接选择维持的基因流的全基因组障碍而持续存在，或者它是否由于面对基因流的颜色模式的直接选择而导致。表型渐变系的分析显示，在虹彩物种之间的平行渐变系，与模仿的直接选择相一致，但渐变系的宽度是不同的物种之间，表明在虹彩的选择强度的差异。基因分型测序显示，较少定义的人口结构和较弱的基因组分化在H。melpomene，这表明杂交区在两个物种中进化不同。在这两个物种中，虹彩渐变与全基因组祖先渐变不一致，表明它们是直接选择的目标。这是第一次直接比较在这个经典的穆勒拟态系统的数量性状和孟德尔性状的分歧。
Hybrid zones, where phenotypically distinct populations meet and interbreed, give insight into how differences between populations are maintained despite gene flow. Divergence in quantitative traits, controlled by multiple loci, may require stronger barriers to gene flow than traits controlled by few, major effect loci. The butterfliesHeliconius eratoandHeliconius melpomeneare distantly related Müllerian mimics that show parallel divergence in wing colour patterns between geographical races across South America. We investigated intraspecific hybrid zones in which the colour patterns of both species show discrete variation in pigmentation, and quantitative variation in iridescent blue. We tested whether differentiation across hybrid zones persisted due to genome-wide barriers to gene flow maintained by indirect selection, or whether it resulted from direct selection on colour patterns in the face of gene flow. Analysis of phenotypic clines revealed parallel clines in iridescence between species, consistent with direct selection for mimicry, but cline widths were different between species, indicating differences in the strength of selection on iridescence. Genotyping-by-sequencing revealed less defined population structure and weaker genomic differentiation inH. melpomene, suggesting the hybrid zone has evolved differently in the two species. In both species, iridescence clines were not concordant with genome-wide ancestry clines, suggesting that they are targets of direct selection. This is the first direct comparison of divergence in quantitative and Mendelian traits in this classic Müllerian mimicry system.
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