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乍得高频R1b1被认为并不是从北非迁入的而是来自于东非

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发表于 2018-3-21 15:45 | 显示全部楼层 |阅读模式
The genetic landscape of Equatorial Guinea and the origin and migration routes of the Y chromosome haplogroup R-V88

Abstract

Human Y chromosomes belonging to the haplogroup R1b1-P25, although very common in Europe, are usually rare in Africa. However, recently published studies have reported high frequencies of this haplogroup in the central-western region of the African continent and proposed that this represents a ‘back-to-Africa' migration during prehistoric times. To obtain a deeper insight into the history of these lineages, we characterised the paternal genetic background of a population in Equatorial Guinea, a Central-West African country located near the region in which the highest frequencies of the R1b1 haplogroup in Africa have been found to date. In our sample, the large majority (78.6%) of the sequences belong to subclades in haplogroup E, which are the most frequent in Bantu groups. However, the frequency of the R1b1 haplogroup in our sample (17.0%) was higher than that previously observed for the majority of the African continent. Of these R1b1 samples, nine are defined by the V88 marker, which was recently discovered in Africa. As high microsatellite variance was found inside this haplogroup in Central-West Africa and a decrease in this variance was observed towards Northeast Africa, our findings do not support the previously hypothesised movement of Chadic-speaking people from the North across the Sahara as the explanation for these R1b1 lineages in Central-West Africa. The present findings are also compatible with an origin of the V88-derived allele in the Central-West Africa, and its presence in North Africa may be better explained as the result of a migration from the south during the mid-Holocene.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573200/
 楼主| 发表于 2018-3-21 15:47 | 显示全部楼层
这下R1b从哪儿来的需要好好讨论了,R1早期分化到底是东非西亚还是南亚都有可能
发表于 2018-3-21 16:30 | 显示全部楼层
乍得的R1b和北非的R1b都是东非R1b的下游分支,更早的迁徙路线是中亚南部-南高加索-叙利亚-埃及。

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发表于 2018-3-21 18:21 | 显示全部楼层
V88最早的古代样本是在欧洲的发现的,现在的分布在近东、北非也有,欧洲的V88灭绝了。扩散地应该还是在近东
发表于 2018-3-21 23:07 | 显示全部楼层
本帖最后由 lindberg 于 2018-3-21 23:16 编辑

我倒是觉得,很可能在LGM,从巴尔干或者高加索南下躲到小亚,后来在从小亚沿莱万特地区向非洲迁徙。
而且我怎么感觉这个P25是不是以前分错的那个?现在好像属于Q了
发表于 2018-3-22 04:43 | 显示全部楼层
什么年代的文章啊,又拿出来炒冷饭,希望这次能有新意~
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