The information is sketchy as of now but the news in the press indicate that an Homo sapiens from Tianyuan Cave
, near Beijing, whose fragmented remains were discovered in 2003, was closely related to modern East Asians and Native Americans.
The paper is not yet online but the information released to the media strongly suggests that East Asians were already distinct from other populations some 40,000 years ago. This would seem to be based on the sequencing of the mitochondrial DNA and the explicit mention of Native Americans indicates that the lineage must be A, B, C or D (X, the fifth and less common matrilineage of Native Americans, is not found in East Asians, with some exceptions from Siberia, so we can exclude it safely).
Ancient DNA from cell nuclei and maternally inherited mitochondria
indicates that this individual belonged to a population that eventually
gave rise to many present-day Asians and Native Americans, says a team
led by Qiaomei Fu and Svante Pääbo, evolutionary geneticists at the Max
Planck Institute for Evolutionary Anthropology in Leipzig, Germany.
This would seem to discard some adventurous hypothesis floating around about tremendous demographic changes in the Paleolithic and afterwards, at least for this region. Probably not even when “mode 4” technology arrived to the region (from Altai) c. 30,000 years ago.
In other words: the seeds of modern populations were already there c. 40,000 years ago in East Asia (and surely also in most other regions) and, even if they may have changed somewhat, they have remained the same at least to some notable degree.
Furthermore, the autosomal DNA also seems to have been sequenced to at least some degree because the researchers state that Denisovan and Neanderthal genetic inputs are at the same levels as modern North Chinese (i.e. some 0% and 2.5% respectively):
The partial skeleton, unearthed in Tianyuan Cave near Beijing in 2003,
carries roughly the same small proportions of Neandertal and Denisovan
genes as living Asians do (SN: 8/25/12, p. 22), the scientists report online January 21 in the Proceedings of the National Academy of Sciences.
Or in the words of the Max Plank Institute:
The genetic profile reveals that this early modern human was related to
the ancestors of many present-day Asians and Native Americans but had
already diverged genetically from the ancestors of present-day
Europeans. In addition, the Tianyuan individual did not carry a larger
proportion of Neanderthal or Denisovan DNA than present-day people in
This also seems to discard models implying Denisovan admixture happening in Siberia or NE Asia and would indirectly support my own hypothesis of admixture with Homo erectus (for which Denisovans, plausibly an Erectus-Neanderthal hybrid, would be just a proxy) in or near Indonesia.
Sources: Science News
, Max Plank Institute
Update (Jan 22): the paper is already online and is open access (cool!) I don’t think I have time to discuss it today but will do tomorrow without doubt (other than the sky falls on my head, you know).