间接遗传效应增加了可供选择的遗传变异,对行为的影响最大:一项荟萃分析。

IF 3.4 1区 生物学 Q2 EVOLUTIONARY BIOLOGY Evolution Letters Pub Date : 2024-10-10 eCollection Date: 2025-02-01 DOI:10.1093/evlett/qrae051
Francesca Santostefano, Maria Moiron, Alfredo Sánchez-Tójar, David N Fisher
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引用次数: 0

摘要

性状的进化潜力取决于可用于选择的遗传变异量。虽然这通常是根据焦点个体自身性状的遗传变异来量化的(直接遗传效应,DGEs),但当发生社会互动时,互动伙伴的遗传变异也会影响焦点个体的性状(间接遗传效应,IGEs)。 理论和对驯化物种的研究表明,IGEs 可以极大地影响进化轨迹,但在更广泛的范围内是否如此仍不清楚。在此,我们进行了系统综述和荟萃分析,以量化间接遗传效应所解释的性状变异量以及间接遗传效应对适应潜力预测的贡献。我们从 21 个物种的 47 项研究中确定了 180 个效应大小,发现平均而言,单个社会伙伴的 IGEs 对表型变异的影响很小,但在统计学上却很显著(0.03)。由于 IGEs 会影响每个互动群体成员的性状值,而且与 DGEs 通常呈正相关(尽管在统计上并不显著)(r DGE-IGE = 0.26),IGEs 最终会将性状遗传率从 0.27(狭义遗传率)大幅提高到 0.45(总遗传变异)。遗传率平均增加 66%,这表明 IGEs 可以增加可用于选择的遗传变异量。此外,IGEs 在不同的研究中表现出相当大的差异,但最突出的是行为,其次是繁殖和生存,与形态、代谢、生理和发育特征形成鲜明对比。因此,我们的荟萃分析表明,IGEs 往往会提高性状的进化潜力,尤其是那些与其他个体的相互作用密切相关的性状,如行为和繁殖。
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Indirect genetic effects increase the heritable variation available to selection and are largest for behaviors: a meta-analysis.

The evolutionary potential of traits is governed by the amount of heritable variation available to selection. While this is typically quantified based on genetic variation in a focal individual for its own traits (direct genetic effects, DGEs), when social interactions occur, genetic variation in interacting partners can influence a focal individual's traits (indirect genetic effects, IGEs). Theory and studies on domesticated species have suggested IGEs can greatly impact evolutionary trajectories, but whether this is true more broadly remains unclear. Here, we perform a systematic review and meta-analysis to quantify the amount of trait variance explained by IGEs and the contribution of IGEs to predictions of adaptive potential. We identified 180 effect sizes from 47 studies across 21 species and found that, on average, IGEs of a single social partner account for a small but statistically significant amount of phenotypic variation (0.03). As IGEs affect the trait values of each interacting group member and due to a typically positive-although statistically nonsignificant-correlation with DGEs (r DGE-IGE = 0.26), IGEs ultimately increase trait heritability substantially from 0.27 (narrow-sense heritability) to 0.45 (total heritable variance). This 66% average increase in heritability suggests IGEs can increase the amount of genetic variation available to selection. Furthermore, whilst showing considerable variation across studies, IGEs were most prominent for behaviors and, to a lesser extent, for reproduction and survival, in contrast to morphological, metabolic, physiological, and development traits. Our meta-analysis, therefore, shows that IGEs tend to enhance the evolutionary potential of traits, especially for those tightly related to interactions with other individuals, such as behavior and reproduction.

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来源期刊
Evolution Letters
Evolution Letters EVOLUTIONARY BIOLOGY-
CiteScore
13.00
自引率
2.00%
发文量
35
审稿时长
10 weeks
期刊介绍: Evolution Letters publishes cutting-edge new research in all areas of Evolutionary Biology. Available exclusively online, and entirely open access, Evolution Letters consists of Letters - original pieces of research which form the bulk of papers - and Comments and Opinion - a forum for highlighting timely new research ideas for the evolutionary community.
期刊最新文献
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