Reconstructing the origin of Andaman Islanders.
نویسندگان
چکیده
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.
منابع مشابه
Comment on "Reconstructing the origin of Andaman islanders".
On the basis of mitochondrial DNA sequence analyses, Thangaraj et al. (Brevia, 13 May 2005, p. 996) proposed that Andaman islanders descended from the first humans to migrate out of Africa. We identified mitochondrial DNA from two northeast Indian Rajbanshi individuals that shares three specific mutations with the M31a lineage observed in the Great Andamanese, which suggests that the predecesso...
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The "negrito hypothesis" suggests that populations of small-bodied foragers in South and Southeast Asia who share common phenotypic characteristics may also share a common, ancient origin. The key defining characteristics of the "negrito" phenotype, small body size, dark skin, and tightly curled hair, have been interpreted as linking these populations to sub-Saharan Africans. The underlying ass...
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Mitochondrial sequences were retrieved from museum specimens of the enigmatic Andaman Islanders to analyze their evolutionary history. D-loop and protein-coding data reveal that phenotypic similarities with African pygmoid groups are convergent. Genetic and epigenetic data are interpreted as favoring the long-term isolation of the Andamanese, extensive population substructure, and/or two tempor...
متن کاملThe Andaman Islanders in a regional genetic context: reexamining the evidence for an early peopling of the archipelago from South Asia.
The indigenous inhabitants of the Andaman Islands were considered by many early anthropologists to be pristine examples of a "negrito" substrate of humanity that existed throughout Southeast Asia. Despite over 150 years of research and study, questions over the extent of shared ancestry between Andaman Islanders and other small-bodied, gracile, dark-skinned populations throughout the region are...
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The aboriginal tribal groups living in the Andaman and Nicobar Islands are thought to be the descendants of people who were part of the early human dispersal into the Southeast Asia. However, the origin of the tribes of Andaman, the region from where the aboriginals arrived and the route of their migration are still a matter of great speculation. To explore the origin and affinities of the Anda...
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عنوان ژورنال:
- Science
دوره 308 5724 شماره
صفحات -
تاریخ انتشار 2005