Talk:Haplogroup C (Y-DNA)
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The article would need a much better structure, i.e. dividing it into separate paragraphs, each dealing with each subclade in detail. Centrum99 (talk) 06:50, 13 January 2008 (UTC)
[edit] Haplogroup C2 and its subclades
According to ISOGG's Y-DNA haplogroup tree (2007), haplogroup C2 is defined by M38 and it has two parallel subclades, C2a-P33 and C2b-M208. However, according to Cox et al., "A Polynesian Motif on the Y Chromosome: Population Structure in Remote Oceania" (Human Biology, vol. 79, 2007), haplogroup C2-M38 has only one identified immediate subclade, haplogroup C2a-M208, and C2a-M208 in turn has two immediate subclades, haplogroup C2a1-P33 and haplogroup C2a2-P54. The data of Cox et al. show haplogroup C2-M38*(xC2a-M208) as being the only form of haplogroup C2 found in central and eastern Indonesia, from Sulawesi, Flores, and Sumba eastwards through the Maluku Islands. Haplogroup C2-M38*(xC2a-M208) is present in approx. 30% of the total of all samples from central and eastern Indonesia in Cox et al. (2007), with the highest frequency of haplogroup C2-M38* being found among the population of the central Indonesian island of Sumba.
In New Guinea, in addition to very small amounts of haplogroup C2-M38*(xC2a-M208), Cox et al. have also found small amounts of haplogroup C2a-M208*(xC2a1-P33). Haplogroup C2a-M208* is limited to low frequency (2/21 or approx. 10%) among their sample of people from Coastal New Guinea.
C2a1-P33, on the other hand, is extremely common among (and completely limited to) Polynesian populations. Cox et al. found haplogroup C2a1-P33 Y-chromosomes among their samples of Polynesians from Rapanui (Easter Island), Tahiti, Samoa, and Tonga, but this haplogroup was completely absent from their samples of populations from Melanesia (including Vanuatu and the Solomon Islands), Micronesia, and Indonesia. Basically, this means that the majority of Polynesian males are descended directly from some man who was related to the direct patrilineal ancestor of the majority of Sumbanese as well as a significant proportion of men in Flores, Sulawesi, and the Malukus. This man later moved eastward to somewhere around the north coast of New Guinea, where he left a few branches of his descendants at low frequency among some coastal New Guinean populations. Most of his descendants, however, moved further eastward, past New Guinea and Melanesia, and out into the Polynesian islands of Remote Oceania.
Should we change the "Subclades" section on the haplogroup C (Y-DNA) wiki page to reflect the data of Cox et al., or should we continue to follow ISOGG's Y-DNA haplogroup tree? Ebizur (talk) 21:27, 22 February 2008 (UTC)
