在单个位置上进行选择驱动了黄领 (Zonotrichia capensis) 羽毛的分化
Pablo D Lavinia1,2, Leonardo Campagna3,4, Martín Carboni5
1Universidad Nacional de Río Negro. Laboratorio de Investigación y Conservación de la Biodiversidad (UNRN-InCoBIO). Sede Atlántica, Viedma, Río Negro, Argentina.
Evolution; international journal of organic evolution
|April 24, 2025
概括
对黄领的基因组分析揭示了5号染色体上的一个独特的遗传区域,与巴塔哥尼亚亚种 (Z. c. australis) 的较白色羽毛有关. 这一发现揭示了鸟类颜色变化的演变.
科学领域:
- 进化生物学 进化生物学
- 基因组学就是基因组学.
- 鸟类学 鸟类学是一门学科.
背景情况:
- 粗领 (Zonotrichia capensis) 在其范围内表现出显著的表型变异.
- 巴塔哥尼亚亚种,Z. c. australis,以灰色的头和较淡的羽毛显得明显,缺乏典型的冠状条纹.
研究的目的:
- 为了研究Zonotrichia capensis的羽毛颜色差异的基因组基础.
- 探索推动Z. c. australis亚种独特表型的进化机制.
主要方法:
- 全基因组测序18个红领 (9个来自Z. c. australis和9个来自阿根廷北部).
- 对基因组分化的分析,重点关注5号染色体上的特定分歧峰值.
- 线粒体DNA分析以估计分离时间.
主要成果:
- 在染色体5上发现了一个单一的~465kb的基因组分歧峰值,该染色体包含ST5基因.
- ST5调节RAB9A,这是一种对黑色素体生物发生和色素化至关重要的基因.
- 线粒体DNA表明,Z. c. australis大约在40万年前分离,可能受到普莱斯托时代冰川的影响.
结论:
- ST5基因是Zonotrichia capensis中黑色羽毛多态的强有力的候选者.
- 观察到的羽毛差异与格洛格的规则一致,将较浅的颜色与更冷,更干燥的气候相关联.
- 基因组差异化可能是来自于全方位种群的选择或对基因流动的选择.
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