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在人类进化模型中忽视人口结构可能会导致虚假混合事件的推断

Rémi Tournebize^1,2,3, Lounès Chikhi^4,5,6

¹UMR DIADE, Université de Montpellier, IRD, CIRAD, Montpellier, France. remi.tournebize@ird.fr.

Nature ecology & evolution

|December 13, 2024

概括

遗传数据分析显示,忽视人口结构可能导致关于古代人类杂交事件的错误结论. 在结构化模型中,重新评估尼安德特人和智人混合物至关重要.

科学领域:

古人类学古人类学.
人类进化人类进化
基因组学就是基因组学.
古代DNA分析古代DNA分析

背景情况:

基因组和古代DNA数据已经改变了人类进化研究,包括尼安德特人和丹尼索瓦人的基因组测序.
从遗传数据中识别古老的进化事件,如瓶和混合物,是复杂的,并且取决于模型.
关于尼安德特人和智人混杂的共识在很大程度上是基于经常忽视关键人口结构的模型.

研究的目的:

调查人口结构对推断古代混合事件的影响.
通过在结构化,无添加剂的场景下模拟数据来挑战现有的添加剂模型.
提出结构化模型对于准确理解人类进化至关重要.

主要方法:

在结构化,无添加物的人类进化模型下模拟基因组数据.
在模拟数据上测试了各种混合方法,以评估它们的准确性.
将模型预测与经验多样性和混合统计数据进行比较,包括D统计轨迹.

主要成果:

模拟数据,尽管缺乏实际的添加剂,但被测试的模型错误地解释为尼安德特人添加剂.
一些已发表的混合模型未能准确预测关键的经验统计数据.
从结构化模型中得出的场景显示了联合统计和D统计轨迹的优异预测.

结论:

忽视人口结构可能会导致对古代混合事件的虚假推断,包括尼安德特人-智人杂交.
尼安德特人和智人之间的混合需要使用纳入人口结构的模型进行重新评估.
结构化模型对于准确理解跨物种古代杂交事件至关重要.

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