Major patterns in the introgression history of Heliconius butterflies
Major patterns in the introgression history of Heliconius butterflies
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DOI：
10.1101/2023.06.21.545923
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发表时间：
2023-10
期刊：
影响因子：
7.7
通讯作者：
Y. Thawornwattana;F. Seixas;Ziheng Yang;J. Mallet
中科院分区：
文献类型：
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作者：
Y. Thawornwattana;F. Seixas;Ziheng Yang;J. Mallet
物种之间的基因流是一个重要的进化过程，可以促进适应性，并导致物种的重建。包括“熔融 - 硅质状态”组，显示了广泛的历史和持续的基因，我们获得了物种系统发育中的关键参数的级别估计，包括物种差异时间，当前的人群和祖先的大小和祖先的大小以及在基因流动的方向和强度。 Likely represents the earliest-branching lineage of the genus and that “silvaniform” species are paraphyletic within the melpomene-silvaniform group. Our phylogeny provides new, parsimonious histories for the origins of key traits in Heliconius, including pollen feeding and an inversion involved in wing pattern mimicry. Our results demonstrate the power and feasibility of the full-likelihood MSC approach for estimating species phylogeny and key population parameters destination extensive基因流量。
Gene flow between species is an important evolutionary process that can facilitate adaptation and lead to species diversification. It also makes reconstruction of species relationships difficult. Here, we use the full-likelihood multispecies coalescent (MSC) approach to estimate species phylogeny and major introgression events in Heliconius butterflies from whole-genome sequence data. We obtain a robust estimate of species branching order among major clades in the genus, including the “melpomene-silvaniform” group, which shows extensive historical and on-going gene flow. We obtain chromosome-level estimates of key parameters in the species phylogeny, including species divergence times, present-day and ancestral population sizes as well as the direction, timing, and intensity of gene flow. Our analysis leads to a phylogeny with introgression events that differ from those obtained in previous studies. We find that H. aoede most likely represents the earliest-branching lineage of the genus and that “silvaniform” species are paraphyletic within the melpomene-silvaniform group. Our phylogeny provides new, parsimonious histories for the origins of key traits in Heliconius, including pollen feeding and an inversion involved in wing pattern mimicry. Our results demonstrate the power and feasibility of the full-likelihood MSC approach for estimating species phylogeny and key population parameters despite extensive gene flow. The methods used here should be useful for analysis of other difficult species groups with high rates of introgression.