Islands of speciation or mirages in the desert? Examining the role of restricted recombination in maintaining species.

Islands of speciation or mirages in the desert? Examining the role of restricted recombination in maintaining species.
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DOI:
10.1038/hdy.2009.151
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发表时间:
2009-12
期刊:
影响因子:
3.8
通讯作者:
Bennett, S. M.
Bennett, S. M.
中科院分区:
生物学2区
文献类型:
--
作者:
Noor, M. A. F.;Bennett, S. M.

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在过去的十年中,许多研究记录了在杂交中经历限制性重组的基因组区域中密切相关的物种之间的高度遗传差异,例如在染色体重排或邻近着丝粒的区域内。这些区域被称为“物种形成岛”,因为它们被认为在维持物种完整性方面发挥作用,尽管基因组中的其他地方存在基因流动。在这里,我们回顾这种模式的替代解释。祖先变异的分离或物种内核苷酸多样性的人工制品很容易导致限制性重组区域的FST高于基因组的其他部分,即使在完全不存在物种间基因流动的情况下,也会导致研究人员错误地得出物种形成岛存在的结论。最后,我们讨论了各种手段的优势和劣势,用于测试限制性重组在维持物种中的作用。
Over the past decade, many studies documented high genetic divergence between closely related species in genomic regions experiencing restricted recombination in hybrids, such as within chromosomal rearrangements or areas adjacent to centromeres. Such regions have been called “islands of speciation” because of their presumed role in maintaining the integrity of species despite gene flow elsewhere in the genome. Here, we review alternative explanations for such patterns. Segregation of ancestral variation or artifacts of nucleotide diversity within species can readily lead to higher FST in regions of restricted recombination than other parts of the genome, even in the complete absence of interspecies gene flow, and thereby cause investigators to erroneously conclude that islands of speciation exist. We conclude by discussing strengths and weaknesses of various means for testing the role of restricted recombination in maintaining species.
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