由于自我施肥而导致的净化不会阻止膨胀负载的积累
Leo Zeitler1, Christian Parisod1, Kimberly J Gilbert1
1Department of Biology, University of Fribourg, Fribourg, Switzerland.
PLoS genetics
|September 1, 2023
概括
自杀有助于物种范围的扩大,但不能阻止遗传负载的积累. 较高的自我速率会清除具有较大的效果的突变,但在扩张过程中仍会积累较小效果的等位基因.
科学领域:
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
- 生态生态学 生态生态学
背景情况:
- 物种范围的扩大使殖民人口暴露在新的环境和交配挑战中.
- 自我受精 (selfing) 在范围边缘很常见,可能有助于获得伴侣并清除遗传负载.
- 遗传负荷,有害突变的积累,可以阻碍人口的建立和持续.
研究的目的:
- 调查自私如何影响在范围扩张期间遗传负载积累和殖民速度.
- 为了区分内生关系的影响和人口因素,而不是自我本身.
- 将模拟预测与植物Arabis alpina的经验数据进行比较.
主要方法:
- 种群遗传学模拟以模拟范围扩张的不同自杀率.
- 来自阿尔卑斯阿尔卑斯的异交和自我种群的全基因组序列的分析.
- 将模拟的遗传负载模式与经验性基因组数据进行比较.
主要成果:
- 自我种群表现出更快的范围扩张率.
- 自我和外交种群在扩张过程中都会积累遗传负载.
- 较高的自我速率有效地清除大效果的衰退突变,但小效果的等位基因会积累.
- 阿拉比斯阿尔皮纳的实证数据支持模拟发现的扩张负载和净化在自我群体.
结论:
- 自我化在范围扩张期间促进了更快的殖民化.
- 虽然自杀可以清除严重的突变,但它不能阻止遗传负载的整体积累.
- 通过自我清除是一种部分益处,但不足以完全抵消扩张驱动的遗传负载.
- 了解交配系统的演变对于预测物种对环境变化和范围变化的反应至关重要.
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