Single-gene speciation: Mating and gene flow between mirror-image snails.
Single-gene speciation: Mating and gene flow between mirror-image snails.
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DOI：
10.1002/evl3.31
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发表时间：
2017-12
影响因子：
5
通讯作者：
Davison A
中科院分区：
文献类型：
--
作者：
Richards PM;Morii Y;Kimura K;Hirano T;Chiba S;Davison A
陆地蜗牛的壳卷曲性或手性的变化为研究“单基因”物种形成的可能性提供了机会，因为如果蜗牛在面对面的位置交配，手性相反的个体之间的交配被认为是不可能的。然而，支持单基因物种形成的证据很少，主要基于单基因线粒体研究和物种间手性变异模式。先前，我们使用理论模型表明，由于后代的手性表型是由母体基因型决定的，因此偶尔会发生手性逆转，并使镜像形态之间的基因流动，从而阻止物种形成。在这里，我们的经验表明，有最近或正在进行的基因流动之间的不同手性类型的日本Euhadra物种。我们还报告了镜像变体之间交配的证据，直接显示了基因流动的潜力。因此，理论模型暗示了反向盘绕蜗牛之间的基因流动，我们的实证研究表明，它们可以交配，并且在Euhadra中存在基因流动。在壳卷曲的手性变异被认为创造了一个新物种之前，需要不止一个基因。
Variation in the shell coiling, or chirality, of land snails provides an opportunity to investigate the potential for “single‐gene” speciation, because mating between individuals of opposite chirality is believed not possible if the snails mate in a face‐to‐face position. However, the evidence in support of single‐gene speciation is sparse, mostly based upon single‐gene mitochondrial studies and patterns of chiral variation between species. Previously, we used a theoretical model to show that as the chiral phenotype of offspring is determined by the maternal genotype, occasional chiral reversals may take place and enable gene flow between mirror image morphs, preventing speciation. Here, we show empirically that there is recent or ongoing gene flow between the different chiral types of Japanese Euhadra species. We also report evidence of mating between mirror‐image morphs, directly showing the potential for gene flow. Thus, theoretical models are suggestive of gene flow between oppositely coiled snails, and our empirical study shows that they can mate and that there is gene flow in Euhadra. More than a single gene is required before chiral variation in shell coiling can be considered to have created a new species.
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