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蓝海人类学在线 Ryan WEI's Forum of Anthropology

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尼日利亚新发现的 D0 支系(原为DE*)

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发表于 2019-6-15 19:05 | 显示全部楼层 |阅读模式
Abstract
Present-day humans outside Africa descend mainly from a single expansion out ∼50,000-70,000 years ago, but many details of this expansion remain unclear, including the history of the male-specific Y chromosome at this time. Here, we re-investigate a rare deep-rooting African Y-chromosomal lineage by sequencing the whole genomes of three Nigerian men described in 2003 as carrying haplogroup DE* Y-chromosomes, and analyzing them in the context of a calibrated worldwide Y-chromosomal phylogeny. We confirm that these three chromosomes do represent a deep-rooting DE lineage, branching close to the DE bifurcation, but place them on the D branch as an outgroup to all other known D chromosomes, and designate the new lineage D0. We consider three models for the expansion of Y lineages out of Africa ∼50,000-100,000 years ago, incorporating migration back to Africa where necessary to explain present-day Y-lineage distributions. Considering both the Y-chromosomal phylogenetic structure incorporating the D0 lineage, and published evidence for modern humans outside Africa, the most favored model involves an origin of the DE lineage within Africa with D0 and E remaining there, and migration out of the three lineages (C, D and FT) that now form the vast majority of non-African Y chromosomes. The exit took place 50,300-81,000 years ago (latest date for FT lineage expansion outside Africa - earliest date for the D/D0 lineage split inside Africa), and most likely 50,300-59,400 years ago (considering Neanderthal admixture). This work resolves a long-running debate about Y-chromosomal out-of-Africa/back-to-Africa migrations, and provides insights into the out-of-Africa expansion more generally.

https://www.genetics.org/content ... genetics.119.302368

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发表于 2019-6-18 06:01 | 显示全部楼层
思考一下,D残存的早期支系为什么这么多,而且多在亚热带地区。
发表于 2019-6-18 10:18 | 显示全部楼层
本帖最后由 大凌河 于 2019-6-18 12:05 编辑

我觉得在非洲发现早期分支的意义,是除了D,很有可能 C,F,K 这些单倍群,都是在非洲分化形成之后,再走出非洲的,而之前 认为的 C,D 一起迁移,来到亚洲,所谓的老亚洲的理论,的支撑变得更加单薄。
发表于 2019-6-18 11:48 | 显示全部楼层
如果D0接近DE的根部,则y-D的共祖时间可能会逼近6万年了,而现在亚洲的D的共祖时间大约是4.6万年,这样,亚洲的D与C、F一样,也是建立了较长的瓶颈,不知道这一万多年其中发生了什么.....
发表于 2019-12-1 20:12 | 显示全部楼层
我觉得从欧亚大陆回流非洲也是不可避免的情况。
古人没有不走回头路这个说法。
发表于 2019-12-2 23:52 | 显示全部楼层
imvivi001 发表于 2019-6-18 11:48
如果D0接近DE的根部,则y-D的共祖时间可能会逼近6万年了,而现在亚洲的D的共祖时间大约是4.6万年,这样,亚洲的D与C、F一样,也是建立了较长的瓶颈,不知道这一万多年其中发生了什么.....


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