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Gene conversions are under purifying selection in the carcinoembryonic antigen immunoglobulin gene families of primates

机译:灵长类的癌胚抗原免疫球蛋白基因家族中的基因转化正处于纯化选择中

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摘要

The carcinoembryonic antigen (CEA) family contains a large number of glycoproteins belonging to the immunoglobulin superfamily. Here, we investigate whether the gene conversions occurring between primate CEA-related genes are adaptive. Our results show that primate CEA-related genes are subject to frequent and repeated gene conversion events. Furthermore, gene conversions occur most frequently between nearby genes sharing similar sequences, are not more frequent in Ig-like V-type 1 domains than in the Ig-like C2-type 1 domains and dN/dS ratio tests shown that both these domains evolve either neutrally or under purifying selection. Our results therefore suggest that CEA-related genes evolve under purifying selection and the frequent gene conversion events we observed likely represent selectively neutral events between genes having similar sequences and functions.
机译:癌胚抗原(CEA)家族包含大量属于免疫球蛋白超家族的糖蛋白。在这里,我们调查灵长类动物CEA相关基因之间发生的基因转换是否具有适应性。我们的结果表明,与灵长类动物CEA相关的基因经常发生重复的基因转换事件。此外,基因转换最频繁发生在具有相似序列的附近基因之间,在Ig样V型1域中没有比在Ig样C2型1域中更频繁,并且dN / dS比率测试表明这两个域都在进化无论是中性的还是选择不充分的。因此,我们的结果表明,CEA相关基因在纯化选择下进化,而我们观察到的频繁基因转化事件可能代表具有相似序列和功能的基因之间的选择性中性事件。

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