在化基因组学中解决采样和种群大小偏差支持核桃的南亚起源
Cai-Jin Chen1, Xiao-Xu Pang1,2, Ya-Mei Ding1
1Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, College of Life Sciences, Beijing Normal University, Beijing, 100875, China.
Genome biology
|January 31, 2026
概括
我们开发了一种新方法,以改善化研究中的种群结构分析,准确识别普通核桃 (Juglans regia) 的南亚起源及其关键的化基因.
科学领域:
- 人口遗传学 人口遗传学
- 进化生物学是进化的生物学.
- 基因组学就是基因组学.
背景情况:
- 人口结构推断容易受到来自不平衡的抽样和不同的有效人口大小 (Ne) 的偏差的影响.
- 这些偏见可能错误地将大型祖先种群归类为混合种群,特别是在单一来源的化中.
- 准确的种群遗传学对于理解化历史至关重要.
研究的目的:
- 为STRUCTURE软件提出和验证一种新的参数化策略,以减轻人口结构推断中的偏差.
- 应用这种改进的方法来阐明普通核桃 (Juglans regia) 的化历史和地理起源.
- 确定与核桃化相关的基因组区域和候选基因.
主要方法:
- 开发了一种新的 STRUCTURE参数化,结合了 F 模型和具有降低 ALPHA 值的替代祖先.
- 利用了来自298个常见核桃个体的全基因组重新排序数据,跨越它们的地理范围.
- 应用人口建模和选择分析,以确定积极选择下的基因组区域.
主要成果:
- 这种新的策略有效地减轻了模拟中不平衡的抽样和不平等的人口规模的偏差.
- 对Juglans regia数据的分析强烈支持养的南亚起源.
- 在南亚核桃种群中确定了高遗传多样性,私有基因,低突变负载和人口统计稳定性.
- 在最近的积极选择下检测到的基因组区域和与体结构,花粉发育和脂质运输相关的候选化基因.
结论:
- 这项研究阐明了核桃化的起源,解决了长期存在的争论.
- 证明优化,对模型有意识的结构使用在复杂的人口统计系统中显著增强了人口遗传推断.
- 为未来的化和人口遗传学研究提供了坚实的框架.
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