Genomic Displacement and Shift of the Hybrid Zone in the Japanese Fire-Bellied Newt
Genomic Displacement and Shift of the Hybrid Zone in the Japanese Fire-Bellied Newt
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DOI：
10.1093/jhered/esx085
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发表时间：
2018-03
影响因子：
3.1
通讯作者：
A. Tominaga;M. Matsui;Natsuhiko Yoshikawa;Koshiro Eto;K. Nishikawa
中科院分区：
文献类型：
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作者：
A. Tominaga;M. Matsui;Natsuhiko Yoshikawa;Koshiro Eto;K. Nishikawa
两个分支谱系之间的次级接触区的杂交可以产生各种进化后果，包括一个谱系被另一个谱系的遗传取代。我们检测到这样的情况下，2血统（中部和西部血统）的日本火腹蝾螈，Cynops pyrrhogaster在日本西部的中国区。我们使用线粒体细胞色素B基因和11个微卫星位点对来自30个地点的269个个体进行了基因分型。线粒体DNA（mtDNA）分析表明，这两个谱系大多数是平行分布，但在接触带附近共存，而微卫星分析则表明存在一个杂交带。地理渐变分析表明，mtDNA的渐变宽度大于微卫星位点的宽度。迁移率估计和NewHybrids分析表明，中央谱系已扩大其范围的混合区的范围，这表明范围位移的可能性，作为其混合区的移动的结果。我们探讨了与中央血统的入侵相关的不对称基因流的过程，以解释这种模式。
Hybridizations on a secondary contact zone between 2 diverged lineages can have various evolutionary consequences, including the genetic replacement of one lineage by another. We detected such a case between 2 lineages (the Central and Western lineages) of the Japanese fire-bellied newt, Cynops pyrrhogaster in the Chugoku district of western Japan. We genotyped 269 individuals from 30 localities using the mitochondrial cytochrome b gene and 11 microsatellite loci. The mitochondrial DNA (mtDNA) analysis revealed that the 2 lineages were mostly distributed parapatrically to each other but co-occurred around the contact zone, whereas the microsatellite analyses indicated the presence of a hybrid zone. Geographic cline analysis revealed that the cline width of mtDNA is wider than the width of the microsatellite loci. The migration rate estimation and the NewHybrids analysis revealed that the Central lineage has expanded their range into the range of the hybrid zone, suggesting the possibility of range displacement of the 2 lineages as a consequence of the shift of their hybrid zone. We explored the process of asymmetric gene flow associated with the invasion of the Central lineage to explain this pattern.