Thangaraj Kumarasamy, Chaubey Gyaneshwer, Kivisild Toomas, Reddy Alla G, Singh Vijay Kumar, Rasalkar Avinash A, Singh Lalji
Centre for Cellular and Molecular Biology, Hyderabad-500 007, India.
Science. 2005 May 13;308(5724):996. doi: 10.1126/science.1109987.
The origin of the Andaman "Negrito" and Nicobar "Mongoloid" populations has been ambiguous. Our analyses of complete mitochondrial DNA sequences from Onges and Great Andaman populations revealed two deeply branching clades that share their most recent common ancestor in founder haplogroup M, with lineages spread among India, Africa, East Asia, New Guinea, and Australia. This distribution suggests that these two clades have likely survived in genetic isolation since the initial settlement of the islands during an out-of-Africa migration by anatomically modern humans. In contrast, Nicobarese sequences illustrate a close genetic relationship with populations from Southeast Asia.
安达曼“尼格利陀人”和尼科巴“蒙古人种”群体的起源一直不明确。我们对昂格人和大安达曼人群体的完整线粒体DNA序列分析发现了两个深度分化的分支，它们在奠基单倍群M中拥有最近的共同祖先，其谱系分布在印度、非洲、东亚、新几内亚和澳大利亚。这种分布表明，自解剖学上的现代人类从非洲迁出并首次定居这些岛屿以来，这两个分支可能一直处于基因隔离状态而得以存续。相比之下，尼科巴人的序列表明他们与东南亚人群有着密切的遗传关系。
