简单的母体效应动物模型可能会提供附加遗传和母体变异的偏差估计
Joel L Pick1, Craig A Walling1, Loeske E B Kruuk1
1Institute of Ecology and Evolution, University of Edinburgh, Edinburgh, United Kingdom.
Journal of evolutionary biology
|September 22, 2025
概括
如果不适当建模,母亲遗传效应可能会膨胀附加遗传变异 ($V_{A}$) 的估计. 对母亲遗传变异 ($V_{Mg}$) 的计算提高了定量遗传模型的准确性,这对于理解进化潜力至关重要.
科学领域:
- 定量遗传学 是一种定量遗传学.
- 进化生物学是进化的生物学.
- 行为生态学 行为生态学
背景情况:
- 孕产妇的影响可以通过膨胀变异元件来对附加性遗传变异 ($V_{A}$) 的估计产生偏差.
- 当前的模型经常假设母亲的影响是非遗传的或仅在完全兄弟姐妹之间,可能缺少遗传影响.
- 在定量遗传分析中,未计入的母亲遗传变异 (V_{Mg}$) 是一个被低估的偏差来源.
研究的目的:
- 调查未建模的母亲遗传变异 ($V_{Mg}$) 在多大程度上膨胀了对附加遗传变异 ($V_{A}$) 的估计.
- 评估 $V_{Mg}$ 对总母体变异 ($V_{M}$) 和总添加基因变异 ($V_{A_t}$) 估计的影响.
- 评估在定量遗传分析中明确建模 $V_{Mg}$ 的可行性和好处.
主要方法:
- 对8种物种发表的定量遗传数据进行分析,以估计母体变异的遗传比例.
- 模拟模型的开发和应用,以探索在各种条件下未建模的 $V_{Mg}$ 引入的偏差.
- 从具有和没有明确的 $V_{Mg}$ 术语的模型中对估计的比较,包括具有小血统大小的评估.
主要成果:
- 已公布的数据表明,大约65%的母体总变异 ($V_{M}$) 是遗传的 ($V_{Mg}$).
- 没有建模的$V_{Mg}$始终导致$V_{A}$的高估和$V_{M}$的低估.
- $V_{A}$和 $V_{M}$中的偏差随着非兄弟姐妹的母系亲属比例的增加而增加,并受到直接母系遗传共变的影响.
结论:
- 显式建模母性遗传变异 ($V_{Mg}$) 对于准确估计附加性遗传变异 ($V_{A}$) 和母性影响至关重要.
- 即使使用有限的血统数据,也可以准确估计V_{Mg}$,从而减轻V_{A}$和V_{A_t}$的偏差.
- 建议在定量遗传学和进化研究中更广泛地采用纳入$V_{Mg}$的模型,以获得可靠的推断.
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