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Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Curr+Biol 2016 ; 26 (9): 1241-7 Nephropedia Template TP
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The combined landscape of Denisovan and Neanderthal ancestry in present-day humans #MMPMID27032491
Sankararaman S; Mallick S; Patterson N; Reich D
Curr Biol 2016[May]; 26 (9): 1241-7 PMID27032491show ga
Some present-day humans derive up to ~5% [1] of their ancestry from archaic Denisovans, an even larger proportion than the ~2% from Neanderthals [2]. We developed methods that can disambiguate the locations of segments of Denisovan and Neanderthal ancestry in present-day humans, and applied them to 257 high coverage genomes from 120 diverse populations among which were 20 individual Oceanians with high Denisovan ancestry [3]. In Oceanians, the average size of Denisovan fragments is larger than Neanderthal fragments, implying a more recent average date of Denisovan admixture in the history of these populations (P=0.00004). We document more Denisovan ancestry in South Asia than is expected based on existing models of history, reflecting a previously undocumented mixture related to archaic humans (P=0.0013). Denisovan ancestry just like Neanderthal ancestry has been deleterious on a modern human genetic background, as reflected by its depletion near genes. Finally, the reduction of both archaic ancestries is especially pronounced on chromosome X and near genes more highly expressed in testes than other tissues (P=1.2×10?7 to 3.2×10?7 for Denisovan and 2.2×10?3 to 2.9×10?3 for Neanderthal ancestry even after controlling for differences in level of selective constraint across gene classes). This suggests that reduced male fertility may be a general feature of mixtures of human populations diverged by >500,000 years.