Clock polymorphism in Pacific salmon: evidence for variable selection along a latitudinal gradient
Clock polymorphism in Pacific salmon: evidence for variable selection along a latitudinal gradient
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太平洋鲑鱼的时钟多态性：沿纬度梯度的变量选择的证据
DOI：
10.1098/rspb.2010.0762
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. J. Hard
中科院分区：
文献类型：
--
作者：
K. O’Malley;M. Ford;J. J. Hard
生活史事件的季节性时间往往是在强烈的自然选择。Clock基因是内源性生物钟的核心组成部分，它可以感知光周期（日长）的变化并调节季节行为。在太平洋鲑科鱼类（虹鳟属）中，迁徙和繁殖的季节性时间受到光周期的影响。为了扩大对42个北美奇努克鲑鱼（Oncorhynchus tshawytscha）种群的研究，我们测试了重复的时钟基因是否有助于生殖时间的种群差异。具体而言，我们研究了地理变化沿着一个类似的纬度梯度在多聚谷氨酰胺结构域（PolyQ）的OtsClock1a和OtsClock1b之间的53个种群的三个物种：鱼（Oncorhynchus凯塔），银鲑（Oncorhynchus kisutch）和粉红鲑鱼（Oncorhynchus gorbuscha）。我们发现OtsClock1b上的变量选择对应于这些物种之间生殖时间的纬度变化的证据。我们使用回归树评估了白昼长度和淡水迁移指数对OtsClock1b PolyQ结构域变异的贡献，发现产卵时的白昼长度解释了大部分Chum和Chinook之间OtsClock1b等位基因频率的变异，但不是coho和粉红鲑鱼种群。我们的研究结果表明，OtsClock1b介导的季节性适应和影响地理变化的生殖时间在这些高度洄游的物种。
Seasonal timing of life-history events is often under strong natural selection. The Clock gene is a central component of an endogenous circadian clock that senses changes in photoperiod (day length) and mediates seasonal behaviours. Among Pacific salmonids (Oncorhynchus spp.), seasonal timing of migration and breeding is influenced by photoperiod. To expand a study of 42 North American Chinook salmon (Oncorhynchus tshawytscha) populations, we tested whether duplicated Clock genes contribute to population differences in reproductive timing. Specifically, we examined geographical variation along a similar latitudinal gradient in the polyglutamine domain (PolyQ) of OtsClock1a and OtsClock1b among 53 populations of three species: chum (Oncorhynchus keta), coho (Oncorhynchus kisutch) and pink salmon (Oncorhynchus gorbuscha). We found evidence for variable selection on OtsClock1b that corresponds to latitudinal variation in reproductive timing among these species. We evaluated the contribution of day length and a freshwater migration index to OtsClock1b PolyQ domain variation using regression trees and found that day length at spawning explains much of the variation in OtsClock1b allele frequency among chum and Chinook, but not coho and pink salmon populations. Our findings suggest that OtsClock1b mediates seasonal adaptation and influences geographical variation in reproductive timing in some of these highly migratory species.
影响因子：
56.9
作者：
Darlington, TK;Wager-Smith, K;Kay, SA
通讯作者：
Kay, SA
影响因子：
56.9
作者：
VITATERNA, MH;KING, DP;TAKAHASHI, JS
通讯作者：
TAKAHASHI, JS
DOI：
10.1073/pnas.0603601103
发表时间：
2006-06-13
影响因子：
11.1
作者：
Vitaterna, Martha Hotz;Ko, Caroline H.;Takahashi, Joseph S.
通讯作者：
Takahashi, Joseph S.