Evolutionary rate of immunoglobulin alpha noncoding region is greater in hominoids than in Old World monkeys.

Evolutionary rate of immunoglobulin alpha noncoding region is greater in hominoids than in Old World monkeys.
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类人猿中免疫球蛋白α非编码区的进化速率高于旧世界猴。

DOI:
--
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发表时间:
1991
影响因子:
10.7
通讯作者:
S. Ueda
S. Ueda
中科院分区:
生物学1区
文献类型:
--
作者:
S. Kawamura;H. Tanabe;Y. Watanabe;K. Kurosaki;N. Saitou;S. Ueda

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近年来对灵长类分子进化的研究表明,类人灵长类的进化速度比非类人灵长类慢得多。然而,在核苷酸序列水平上的这种观察仅限于β-珠蛋白家族区域。在这项研究中,我们测序了黑猩猩,大猩猩,猩猩和食蟹猕猴(一种旧大陆猴)的正向免疫球蛋白α(C α)基因,并通过使用非编码区进行分析,将它们与人类的基因进行比较。由于使用相对比率检验未发现类人猿之间的比率存在显著差异,因此我们评估了旧大陆猴与人类之间的进化距离与猩猩与人类之间的距离的比值(R)。C α基因的R值(1.12)远小于预期值(1.38-2.33),表明人类谱系中C α基因的核苷酸替换率(=选择性中性下每年的突变率)大于旧大陆猴谱系。我们还对γ 1-、γ 2-、psi eta-和δ-珠蛋白基因进行了类似的分析,发现R值之间存在相当大的异质性(1.12-2.37),包括C α基因。这表明,类人猿进化速度减慢并不是灵长类进化中的普遍现象。
Recent studies on the molecular evolution of primates show that the evolutionary rate among hominoids is considerably slower than that among nonhominoid primates. However, this observation at the nucleotide-sequence level is restricted to the beta-globin family region. In this study, we sequenced orthologous immunoglobulin alpha (C alpha) genes of chimpanzee, gorilla, orangutan, and crab-eating macaque (an Old World monkey) and compared them with that of the human by using noncoding regions for analysis. Since significant differences in rates among hominoids were not found by using the relative rate test, we evaluated the ratio (R) of the evolutionary distance between Old World monkey and human to the distance between orangutan and human. The R value (1.12) for the C alpha gene was much smaller than the expected value (1.38-2.33), showing that the nucleotide substitution rate (= mutation rate per year under selective neutrality) of the C alpha gene is greater in the human lineage than in the Old World monkey lineage. We also did a similar analysis for the gamma 1-, gamma 2-, psi eta-, and delta-globin genes and found a considerable heterogeneity (1.12-2.37) among the R values, including that for the C alpha gene. This indicates that the hominoid slowdown of the evolutionary rate is not a universal phenomenon in primate evolution.
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