Thursday, September 22, 2011

Origins of Indians: Version 8.4.2

Coastal Migration Theory and I:
A new paper by Reich et al. (2011) has made the following conclusions:

  • Denisovans interbred with modern humans in Southeast Asia at least 44,000 years ago before the time of the separation of the Australians and New Guineans.
  • Southeast Asia was first colonized by modern humans unrelated to present-day Chinese and Indonesians, and that these and other East Asians arrived in later migrations. This "southern route" hypothesis has previously been supported by archaeological evidence, but has never had strong genetic support.
According to them Denisovans were spread from Siberia to S E Asia until 30000 years ago. As of now, this is an unbelievable idea considering;
- Until now Denisovans remains were found in Siberia only
- All remains that were found in East Asia and SE Asia belonged H.erectus branches.
- A recent study has calculated that all these erectus branches were vanished from East Asia long before modern Humans moved to those lands

As we can see from the above points, we have a situation where archeologists could find remains of older hominins that perished around 400k years ago and probably more restricted East Asian regions but not those of Denisovans spread even wider area and lived at least until 40k years ago.

According to the article:
Their analysis shows that, in addition to New Guineans, Denisovans contributed genetic material to Australian aborigines, a Philippine "Negrito" group called Mamanwa, and several other populations in eastern Southeast Asia and Oceania. However, groups in the west or northwest, including other Negrito groups such as the Onge in the Andaman Islands and the Jehai in Malaysia, as well as mainland East Asians, did not interbreed with Denisovans.

I think Y-Haplogroup lines C2, C4 and C6 ( in fact their female counter parts of a human tribe with node haplogroup line of these) could have mated with Denisovans in north-western East Asia and moved to SE Asia.

Via Science Daily

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