Speciation in the deep sea: multi-locus analysis of divergence and gene flow between two hybridizing species of hydrothermal vent mussels.
Speciation in the deep sea: multi-locus analysis of divergence and gene flow between two hybridizing species of hydrothermal vent mussels.
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DOI：
10.1371/journal.pone.0006485
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发表时间：
2009-08-03
期刊：
影响因子：
3.7
通讯作者：
Bierne N
中科院分区：
文献类型：
--
作者：
Faure B;Jollivet D;Tanguy A;Bonhomme F;Bierne N
重建亲缘关系密切的生物体之间的分化和基因流动的历史一直是进化遗传学的一项艰巨任务。最近，基于聚结理论的新方法已经发展到测试基因流的存在过程中的分歧。深海是应用这些新方法的激励之地。热液环境的异质性可以驱动适应性分化，而种群不应该受到气候波动的强烈干扰，这是地表地理隔离的主要原因。获得了7个核基因座和一个线粒体基因座的DNA序列样本，以便对两种密切相关的热液喷口贻贝Bathyodiolus azoricus和B之间的分歧和基因流进行多基因座分析。puteoserpentis。分析显示，（i）这两个物种在大约76万年前开始分化，（ii）B。种群数量是B的2 ~ 5倍。puteoserpentis和祖先人口和（iii）两个物种之间的基因流发生在整个物种范围内，主要是不对称的，至少在染色体区域的研究。在这两种Bathyodiolus物种之间发现了一个长期的基因流动历史。然而，它被证明是非常困难的，以最终区分从正在进行的parapatric分化继发基因渗入。尽管合并方法可能很强大，但我们仍然面临这样一个事实，即自然种群经常偏离基本模型的标准假设。一个更直接的观察重组的历史在七个位点之一的研究表明，在此期间重组被阻止谱系的异域分化的初始阶段。即使在深海，地理隔离也可能是物种形成的关键促进因素。
Reconstructing the history of divergence and gene flow between closely-related organisms has long been a difficult task of evolutionary genetics. Recently, new approaches based on the coalescence theory have been developed to test the existence of gene flow during the process of divergence. The deep sea is a motivating place to apply these new approaches. Differentiation by adaptation can be driven by the heterogeneity of the hydrothermal environment while populations should not have been strongly perturbed by climatic oscillations, the main cause of geographic isolation at the surface. Samples of DNA sequences were obtained for seven nuclear loci and a mitochondrial locus in order to conduct a multi-locus analysis of divergence and gene flow between two closely related and hybridizing species of hydrothermal vent mussels, Bathymodiolus azoricus and B. puteoserpentis. The analysis revealed that (i) the two species have started to diverge approximately 0.760 million years ago, (ii) the B. azoricus population size was 2 to 5 time greater than the B. puteoserpentis and the ancestral population and (iii) gene flow between the two species occurred over the complete species range and was mainly asymmetric, at least for the chromosomal regions studied. A long history of gene flow has been detected between the two Bathymodiolus species. However, it proved very difficult to conclusively distinguish secondary introgression from ongoing parapatric differentiation. As powerful as coalescence approaches could be, we are left by the fact that natural populations often deviates from standard assumptions of the underlying model. A more direct observation of the history of recombination at one of the seven loci studied suggests an initial period of allopatric differentiation during which recombination was blocked between lineages. Even in the deep sea, geographic isolation may well be a crucial promoter of speciation.
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影响因子：
10.7
作者：
Bryant, D;Moulton, V
通讯作者：
Moulton, V
影响因子：
3.4
作者：
Faure, Matthieu F.;David, Patrice;Bonhomme, Francois;Bierne, Nicolas
通讯作者：
Bierne, Nicolas
DOI：
10.1111/j.1471-8286.2007.01685.x
发表时间：
2007-07-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Bierne, N.;Tanguy, A.;David, P.
通讯作者：
David, P.
DOI：
10.1016/0011-7471(71)90106-9
发表时间：
1971-01-01
期刊：
DEEP-SEA RESEARCH
影响因子：
--
作者：
AMOS, AF;GORDON, AL;SCHNEIDER, ED
通讯作者：
SCHNEIDER, ED
影响因子：
3.9
作者：
BOUGAULT, H;CHARLOU, JL;SILANTIEV, S
通讯作者：
SILANTIEV, S