Polynesian genetic affinities with Southeast Asian populations as identified by mtDNA analysis.

Polynesian genetic affinities to populations of Asia were studied using mtDNA markers. A total of 1,037 individuals from 12 populations were screened for a 9-bp deletion in the intergenic region between the COII and tRNA(Lys) genes that approaches fixation in Polynesians. Sequence-specific oligonucleotide probes that identify specific mtDNA control region nucleotide substitutions were used to describe variation in individuals with the 9-bp deletion. The 9-bp deletion was not observed in northern Indians, Bangladeshis, or Pakistanis but was seen at low to moderate frequencies in the nine other Southeast Asian populations. Three substitutions in the control region at positions 16217, 16247, and 16261 have previously been observed at high frequency in Polynesian mtDNAs; this "Polynesian motif" was observed in 20% of east Indonesians with the 9-bp deletion but was observed in only one additional individual. mtDNA types related to the Polynesian motif are highest in frequency in the corridor from Taiwan south through the Philippines and east Indonesia, and the highest diversity for these types is in Taiwan. These results are consistent with linguistic evidence of a Taiwanese origin for the proto-Polynesian expansion, which spread throughout Oceania by way of Indonesia.

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