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Complete mitochondrial sequences from Mesolithic Sardinia

Complete mitochondrial sequences from Mesolithic Sardinia
Abstract
Little is known about the genetic prehistory of Sardinia because of the scarcity of pre-Neolithic human remains. From a genetic perspective, modern Sardinians are known as genetic outliers in Europe, showing unusually high levels of internal diversity and a close relationship to early European Neolithic farmers. However, how far this peculiar genetic structure extends and how it originated was to date impossible to test. Here we present the first and oldest complete mitochondrial sequences from Sardinia, dated back to 10,000 yBP. These two individuals, while confirming a Mesolithic occupation of the island, belong to rare mtDNA lineages, which have never been found before in Mesolithic samples and that are currently present at low frequencies not only in Sardinia, but in the whole Europe. Preliminary Approximate Bayesian Computations, restricted by biased reference samples for Mesolithic Sardinia (the two typed samples) and Neolithic Europe (limited to central and north European sequences), suggest that the first inhabitants of the island have had a small or negligible contribution to the present-day Sardinian population, which mainly derives its genetic diversity from continental migration into the island by Neolithic times.

http://www.nature.com/articles/srep42869
本帖最后由 imvivi001 于 2017-3-8 14:20 编辑

对撒丁岛人群的研究,欧洲学者这几年发表的论文许多均有涉及。目前来看,撒丁岛居民更接近新石器早期大陆人群(主要是中南欧)。有一点必须提醒大家,欧洲新石器人群的血统从早期到晚期存在明显的变化(请注意,是变化而非小云说的种系替换,从分子遗传学的角度),而且在欧洲各地也是不均匀的。
     不管怎样,现代欧洲人的血统,在新石器晚期大体已经定型了,后期青铜侵略者尽管带来了一些明显的冲击,但是依然没有造成种系意义上的替换。而对中欧地区Y的大面积冲击,如不出意外,应该主要发生于上古末期古罗马帝国大崩溃以后的长达一千年的日耳曼族群的大冲击,尽管期间在日耳曼人主导的王朝统治者中,依然会出现新石器早期比较常见的y-G2a类型。
     有一点扯远了,暂且打住…
物格而后知至,知至而后意诚,意诚而后心正,心正而后身修,身修而后家齐,家齐而后国治,国治而后天下平...
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