High variability and non-neutral evolution of the mammalian avpr1a gene.

High variability and non-neutral evolution of the mammalian avpr1a gene.
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DOI:
10.1186/1471-2148-7-176
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发表时间:
2007-09-27
影响因子:
3.4
通讯作者:
Heckel G
Heckel G
中科院分区:
生物学2区
文献类型:
--
作者:
Fink S;Excoffier L;Heckel G

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精氨酸-加压素1a受体已被确定为田鼠、人类和其他哺乳动物社会行为的关键决定因素。然而,复杂的表型特征的遗传基础,如物种和个体之间的社会和交配行为的差异,在很大程度上仍然未知。相反,以前的研究集中在基因的启动子区域的差异,我们在这里调查的编码区(外显子1)的这个位点的功能变异的水平。我们检测到高等哺乳动物类群之间以及田鼠属物种之间的高序列多样性。这包括长度变异和激进的氨基酸变化,以及个体内不同蛋白质变体的存在。此外,负选择占主导地位的大部分第一外显子的精氨酸加压素受体1a(avpr 1a)基因,但它包含的区域具有较高的变化率,港口积极选择的网站。与其他基因相比,avpr 1a基因中的同义和非同义替换率并不例外,但它们超过了具有类似功能的相关激素受体。这些结果强调了考虑avpr 1a编码序列变异与田鼠、其他哺乳动物和人类生活史特征(如社会行为、交配系统、栖息地要求)的关系的重要性。
The arginine-vasopressin 1a receptor has been identified as a key determinant for social behaviour in Microtus voles, humans and other mammals. Nevertheless, the genetic bases of complex phenotypic traits like differences in social and mating behaviour among species and individuals remain largely unknown. Contrary to previous studies focusing on differences in the promotor region of the gene, we investigate here the level of functional variation in the coding region (exon 1) of this locus. We detected high sequence diversity between higher mammalian taxa as well as between species of the genus Microtus. This includes length variation and radical amino acid changes, as well as the presence of distinct protein variants within individuals. Additionally, negative selection prevails on most parts of the first exon of the arginine-vasopressin receptor 1a (avpr1a) gene but it contains regions with higher rates of change that harbour positively selected sites. Synonymous and non-synonymous substitution rates in the avpr1a gene are not exceptional compared to other genes, but they exceed those found in related hormone receptors with similar functions. These results stress the importance of considering variation in the coding sequence of avpr1a in regards to associations with life history traits (e.g. social behaviour, mating system, habitat requirements) of voles, other mammals and humans in particular.
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期刊: PLOS GENETICS
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