Do Heliconius butterfly species exchange mimicry alleles?
Do Heliconius butterfly species exchange mimicry alleles?
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DOI：
10.1098/rsbl.2013.0503
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发表时间：
2013-08-23
期刊：
影响因子：
3.3
通讯作者：
Kronforst, Marcus R
中科院分区：
文献类型：
--
作者：
Smith, Joel;Kronforst, Marcus R
杂交具有跨物种转移有益等位基因的潜力，而且这种情况明显发生的例子越来越多。最近的研究表明，蝴蝶通过杂交在物种之间转移了翅膀图案模仿等位基因，但祖先多态性也可能在模仿基因周围产生共同祖先的标志。为了区分这些不同的假设，我们测量了假定的渐渗模仿位点周围的DNA序列差异，并将其与基因组的其余部分进行了比较。我们的研究结果显示，假设的渐渗区域在共拟物种之间显示出强烈减少的序列分歧，这表明它们的分歧时间比基因组的其他部分更年轻。这与遗传渐渗而非祖先变异是一致的。我们进一步表明，这种渗入的特征发生在整个基因组的位点上，而不仅仅是在模仿基因周围。
Hybridization has the potential to transfer beneficial alleles across species boundaries, and there are a growing number of examples in which this has apparently occurred. Recent studies suggest that Heliconius butterflies have transferred wing pattern mimicry alleles between species via hybridization, but ancestral polymorphism could also produce a signature of shared ancestry around mimicry genes. To distinguish between these alternative hypotheses, we measured DNA sequence divergence around putatively introgressed mimicry loci and compared this with the rest of the genome. Our results reveal that putatively introgressed regions show strongly reduced sequence divergence between co-mimetic species, suggesting that their divergence times are younger than the rest of the genome. This is consistent with introgression and not ancestral variation. We further show that this signature of introgression occurs at sites throughout the genome, not just around mimicry genes.