Genomic determinants of coral heat tolerance across latitudes
Genomic determinants of coral heat tolerance across latitudes
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DOI：
10.1126/science.1261224
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发表时间：
2015-06-26
期刊：
影响因子：
56.9
通讯作者：
Matz, Mikhail V.
中科院分区：
文献类型：
--
作者：
Dixon, Groves B.;Davies, Sarah W.;Matz, Mikhail V.
随着全球变暖的持续，造礁珊瑚可以通过“基因拯救”来避免当地种群的下降，“基因拯救”涉及在不同纬度之间交换耐热基因型，但前提是耐热性的纬度变化是可遗传的。在这里，我们展示了一个高达10倍的增加，在热应力下的珊瑚幼虫的生存几率时，他们的父母来自一个温暖的低纬度地区。耐热性的提高与氧化、细胞外、运输和线粒体功能表达的遗传差异有关，表明缺乏先前的应激。此外，两个基因组区域强烈响应于纬度间杂交的耐热性选择。这些结果表明，珊瑚耐热性在不同纬度的变化有很强的遗传基础，可以作为自然选择的原材料。
As global warming continues, reef-building corals could avoid local population declines through "genetic rescue" involving exchange of heat-tolerant genotypes across latitudes, but only if latitudinal variation in thermal tolerance is heritable. Here, we show an up-to-10-fold increase in odds of survival of coral larvae under heat stress when their parents come from a warmer lower-latitude location. Elevated thermal tolerance was associated with heritable differences in expression of oxidative, extracellular, transport, andmitochondrial functions that indicated a lack of prior stress. Moreover, two genomic regions strongly responded to selection for thermal tolerance in interlatitudinal crosses. These results demonstrate that variation in coral thermal tolerance across latitudes has a strong genetic basis and could serve as raw material for natural selection.