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探索灵长类动物中AVPR2的多样性及其进化影响
Bibiana Sampaio de Oliveira Fam1, Pedro Vargas-Pinilla1,2, Pâmela Paré1
1Universidade Federal do Rio Grande do Sul, Departamento de Genética, Laboratório de Evolução Humana e Molecular, Porto Alegre, RS, Brazil.
Genetics and molecular biology
|November 6, 2023
概括
灵长类动物中的AVPR2变体在关键部位表现出阳性选择,影响水平衡,并与先天性原性糖尿病无味症有关. 这些遗传差异可能是适应性的,在不同的灵长类群体中具有不同的进化路径.
科学领域:
- 进化生物学是进化的生物学.
- 基因组学就是基因组学.
- 灵长类动物生理学
背景情况:
- 氨酸血管压素受体2 (AVPR2) 对于水的恒温至关重要,由神经激素AVP调节.
- AVPR2变种可以导致诸如先天性原性糖尿病无味症 (cNDI) 等疾病,其特点是过度流失水分.
研究的目的:
- 在灵长类人群中研究AVPR2变异,以了解进化适应.
- 确定可能受选择性压力影响的功能部位和分子相互作用.
主要方法:
- 在不同的灵长类群体中对AVPR2序列进行比较基因组分析.
- 确定积极选择的地点和共同演变的残留物.
- 分析蛋白质域,包括SH3结合基因及其保存.
主要成果:
- 在三个AVPR2位点 (190,250,346) 发现了积极选择;在位置250的变化与人类cNDI有关.
- 还确定了13个与cNDI相关的功能部位.
- 在AVPR2中发现了SH3结合动机,灵长类群的变异表明了适应性作用.
- 在AVPR2和同一个信号通路 (AVP,AQP2) 中的分子之间观察到共同进化的关系.
- 在Platyrrhini和Catarrhini中,明显的共同进化的序列表明了各种选择性压力,可能涉及葡萄糖皮质激素.
结论:
- 在灵长类动物中,AVPR2表现出适应性进化,特定的变异可能会影响水平衡和生理反应.
- 鉴定的功能部位和共同进化的模式突出显示了AVPR2信号的复杂的适应性格局.
- 需要进一步的研究,以充分阐明这些灵长类特定的AVPR2变异的功能和适应意义.
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