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Thread: Aboriginal and Dingo DNA

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    Aboriginal and Dingo DNA

    Two origins for dingos suggests the Murrayans were different after all? Gisele Horvat comments the human mtDNA down there is different from other Aboriginals.

    How and when dingoes arrived in Oceania poses a fascinating question for scientists with interest in the historical movements of humans and dogs. The dingo holds a unique position as top terrestrial predator of Australia and exists in a wild state. In the first geographical survey of genetic diversity in the dingo using whole mitochondrial genomes, we analysed 16,428 bp in 25 individuals from five separate populations. We also investigated 13 nuclear loci to compare with the mitochondrial population history patterns. Phylogenetic analyses based upon mitochondrial DNA and nuclear DNA support the hypothesis that there are at least two distinct populations of dingo, one of which occurs in the northwest and the other in the southeast of the continent. Conservative molecular dating based upon mitochondrial DNA suggest that the lineages split approximately 8300 years before present, likely outside Australia but within Oceania. The close relationship between dingoes and New Guinea Singing Dogs suggests that plausibly dingoes spread into Australia via the land bridge between Papua New Guinea and Australia although seafaring introductions cannot be rejected. The geographical distribution of these divergent lineages suggests there were multiple independent dingo immigrations. Importantly, the observation of multiple dingo populations suggests the need for revision of existing conservation and management programs that treat dingoes as a single homogeneous population.
    http://link.springer.com/article/10....709-016-9924-z

    Aboriginal populations separated from one another at a time equivalent to the European Mesolithic. The people we call Aborigines properly had a homeland in northeast Australia? Tasmanians and possibly others really are relicts?

    The population history of Aboriginal Australians remains largely uncharacterized. Here we generate high-coverage genomes for 83 Aboriginal Australians (speakers of Pama–Nyungan languages) and 25 Papuans from the New Guinea Highlands. We find that Papuan and Aboriginal Australian ancestors diversified 25–40 thousand years ago (kya), suggesting pre-Holocene population structure in the ancient continent of Sahul (Australia, New Guinea and Tasmania). However, all of the studied Aboriginal Australians descend from a single founding population that differentiated ~10–32 kya. We infer a population expansion in northeast Australia during the Holocene epoch (past 10,000 years) associated with limited gene flow from this region to the rest of Australia, consistent with the spread of the Pama–Nyungan languages. We estimate that Aboriginal Australians and Papuans diverged from Eurasians 51–72 kya, following a single out-of-Africa dispersal, and subsequently admixed with archaic populations. Finally, we report evidence of selection in Aboriginal Australians potentially associated with living in the desert.
    http://www.nature.com/nature/journal...ture18299.html

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    We estimate that Aboriginal Australians and Papuans diverged from Eurasians 51–72 kya, following a single out-of-Africa dispersal, and subsequently admixed with archaic populations. Finally, we report evidence of selection in Aboriginal Australians potentially associated with living in the desert

    This means the sapiens portion diverged 51-72kya. The Neanderthal portion was not present in Europeans at this time. In fact, no sapiens or sapiens hybrids had yet even entered Europe The earliest dates for sapiens-Neanderthal hybridization is about 55, 000 years ago. This could mean the Neanderthals in the Aboriginal population came from different Neanderthals than for Europeans. We know this was the case with the Denisovans since there is really none in Europeans. So, it is possible the ancestors of the Aborigines met a hybrid Neanderthal-Denisovan people further east.

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    I noticed two UP sapiens people from S Siberia possessed Uralic-type nasal roots though the portable art suggested a hawk-nosed appearance consistent with North American Indian and Nordic affinities. For this root morphology Coon and others had thought Mal'ta to be a Mongoloid, though the trait is most clearly expressed further west among Uralics today, so is improbable to be down to eastern admixture. Given the late, local survival of neanderthaloid dental traits in the Baraba forest-steppe region, its suggestive the local neanderthal face differed from the western Classic Neanderthal face in ways foreshadowing the modern racial cline.

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