分歧和并行选择对基因组分歧景观的影响
Hisham A A Ali1, Tim Coulson1, Sonya M Clegg1
1Department of Biology, Edward Grey Institute of Field Ornithology, University of Oxford, Oxford, UK.
Molecular ecology
|December 8, 2023
概括
基因组岛屿和山谷揭示了物种化过程中的选择特征. 建模表明,分歧选择会产生岛屿,而平行选择会产生山谷,而迁移和依赖频率的选择会影响模式.
科学领域:
- 进化生物学 进化生物学
- 人口遗传学 人口遗传学
- 规范研究研究 规范研究
背景情况:
- 选择在物种化中的作用是理论上理解的,但在基因组分歧中选择特征的经验识别仍然具有挑战性.
- 分歧的基因组景观可能是异质的,这表明复杂的进化过程正在发挥作用.
- 建模方法提供了一种方法来调查选择对这些基因组模式的潜在影响.
研究的目的:
- 扩展和应用基于个体的建模方法来模拟各种进化场景下的基因组分歧.
- 研究不同的选择制度,迁移模式和基因型与环境相互作用如何塑造基因组景观.
- 识别与分歧和并行选择相关的特定基因组特征.
主要方法:
- 开发了一种基于个体的模拟模型,以跟踪两个分离的种群的表型和基因型分布.
- 模拟包括各种选择模式 (分歧,并行,频率依赖),基因型-表型图,迁移模式 (恒定与间歇) 和基因型-环境相互作用.
- 分析的重点是识别基因组差异化 (高差异化岛屿) 和相似性 (相似性谷) 的模式.
主要成果:
- 种群之间的分离选择产生了高度差异化的基因组岛屿,而并行选择产生了相似的基因组谷.
- 群体内的依赖频率的选择放大了这些模式,创造了更明显的岛屿或山谷.
- 差异率受到主导地位,基因型与环境相互作用和迁移模式的影响,间歇性迁移增加了差异.
结论:
- 从基因组模式解释进化历史需要谨慎,因为类似的模式可以来自不同的过程组合.
- 建模方法对于了解选择和其他因素如何为异质基因组分歧的景观做出贡献至关重要.
- 这项研究为缩小在物种化过程中产生观察到的基因组模式的潜在进化路径提供了一个框架.
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