Comprehensive survey of condition-specific reproductive isolation reveals genetic incompatibility in yeast.

Comprehensive survey of condition-specific reproductive isolation reveals genetic incompatibility in yeast.
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DOI:
10.1038/ncomms8214
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发表时间:
2015-05-26
影响因子:
16.6
通讯作者:
Schacherer, Joseph
Schacherer, Joseph
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hou, Jing;Friedrich, Anne;Gounot, Jean-Sebastien;Schacherer, Joseph

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Genetic variation within a species could cause negative epistasis leading to reduced hybrid fitness and post-zygotic reproductive isolation. Recent studies in yeasts revealed chromosomal rearrangements as a major mechanism dampening intraspecific hybrid fertility on rich media. Here, by analysing a large number of Saccharomyces cerevisiae crosses on different culture conditions, we show environment-specific genetic incompatibility segregates readily within yeast and contributes to reproductive isolation. Over 24% (117 out of 481) of cases tested show potential epistasis, among which 6.7% (32 out of 481) are severe, with at least 20% of progeny loss on tested conditions. Based on the segregation patterns, we further characterize a two-locus Dobzhansky–Müller incompatibility case leading to offspring respiratory deficiency caused by nonsense mutation in a nuclear-encoding mitochondrial gene and tRNA suppressor. We provide evidence that this precise configuration could be adaptive in fluctuating environments, highlighting the role of ecological selection in the onset of genetic incompatibility and reproductive isolation in yeast. Chromosomal rearrangements may hamper intraspecific hybrid fertility. Here the authors show that environment-specific genetic incompatibility segregates readily within intermating populations and leads to intrinsic reproductive isolation within a yeast species.
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