Detecting cryptic indirect genetic effects.

Detecting cryptic indirect genetic effects.
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DOI:
10.1111/evo.12401
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发表时间:
2014-07
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Hoskins JL
Hoskins JL
中科院分区:
其他
文献类型:
--
作者:
Bailey NW;Hoskins JL

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当一个个体表达的基因改变了相互作用伴侣的表型时,就会发生间接遗传效应(IGE)。 IGE 可以极大地影响社会特征的表达和演变。然而,它们传播的相互作用表型通常是未知的或神秘的,它们的检测将增强我们准确预测进化变化的能力。为了说明这一挑战和可能的解决方案,我们使用黑腹果蝇的近交系与常见的焦点雄性品系配对,分析了雄性的拍腿行为。焦点雄性中敲击的表达取决于其相互作用伴侣的基因型,但这种强烈的 IGE 是神秘的。使用多重回归方法,我们将雄性惊吓反应确定为候选的相互作用表型:相互作用的雄性在受到惊吓后稳定下来的时间越长,雄性对它们的关注就越少。一项全基因组关联分析确定了大约十几个可能是 IGE 基础的候选蛋白质编码基因,其中最重要的是 Slowpoke。我们的方法框架提供了有关候选表型和候选单核苷酸多态性的信息,这些信息支撑着强大而神秘的 IGE。我们讨论了这种方法如何促进其他研究系统中促成不寻常进化动力学的神秘 IGE 的检测。
Indirect genetic effects (IGEs) occur when genes expressed in one individual alter the phenotype of an interacting partner. IGEs can dramatically affect the expression and evolution of social traits. However, the interacting phenotype(s) through which they are transmitted are often unknown, or cryptic, and their detection would enhance our ability to accurately predict evolutionary change. To illustrate this challenge and possible solutions to it, we assayed male leg-tapping behavior using inbred lines of Drosophila melanogaster paired with a common focal male strain. The expression of tapping in focal males was dependent on the genotype of their interacting partner, but this strong IGE was cryptic. Using a multiple-regression approach, we identified male startle response as a candidate interacting phenotype: the longer it took interacting males to settle after being startled, the less focal males tapped them. A genome-wide association analysis identified approximately a dozen candidate protein-coding genes potentially underlying the IGE, of which the most significant was slowpoke. Our methodological framework provides information about candidate phenotypes and candidate single-nucleotide polymorphisms that underpin a strong yet cryptic IGE. We discuss how this approach can facilitate the detection of cryptic IGEs contributing to unusual evolutionary dynamics in other study systems.
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