Resequencing data provide no evidence for a human bottleneck in Africa during the penultimate glacial period.

Resequencing data provide no evidence for a human bottleneck in Africa during the penultimate glacial period.
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重测序数据没有提供任何证据表明非洲在倒数第二次冰期期间存在人类瓶颈。

DOI:
10.1093/molbev/mss061
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发表时间:
2012
影响因子:
10.7
通讯作者:
M. Blum
M. Blum
中科院分区:
生物学1区
文献类型:
--
作者:
P. Sjödin;Agnès E Sjöstrand;M. Jakobsson;M. Blum

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基于遗传、气候和化石证据的积累,古人类学的一个核心理论认为,人口瓶颈与我们人类的起源相吻合。这一理论提出,解剖学上的现代人类--当时只存在于非洲--在倒数第二个冰河时代(130-190千年)经历了一个剧烈的瓶颈,当时寒冷和干燥的气候占主导地位。人们提出了两种方案来描述瓶颈,其中涉及人类占据的范围的碎片化或一小群人的生存。在这里,我们分析的DNA序列数据,从61个核基因座测序在三个非洲人口使用近似贝叶斯计算和数值模拟。在对比的瓶颈理论,我们表明,一个简单的模型,没有任何瓶颈在倒数第二个冰河时期有最大的统计支持相比,瓶颈模型。虽然提出的瓶颈是古老的,发生至少130 kya,我们可以放弃的可能性,它没有留下可检测的足迹在DNA序列数据,除非瓶颈涉及一个小于3倍的人口规模减少。最后,我们确认,一个简单的模型没有瓶颈是能够重现的遗传变异的观察模式的主要特征。我们的结论是,现代人类起源的更新世避难所模型,现在需要大量的修改。
Based on the accumulation of genetic, climatic, and fossil evidence, a central theory in paleoanthropology stipulates that a demographic bottleneck coincided with the origin of our species Homo Sapiens. This theory proposes that anatomically modern humans--which were only present in Africa at the time--experienced a drastic bottleneck during the penultimate glacial age (130-190 kya) when a cold and dry climate prevailed. Two scenarios have been proposed to describe the bottleneck, which involve either a fragmentation of the range occupied by humans or the survival of one small group of humans. Here, we analyze DNA sequence data from 61 nuclear loci sequenced in three African populations using Approximate Bayesian Computation and numerical simulations. In contrast to the bottleneck theory, we show that a simple model without any bottleneck during the penultimate ice age has the greatest statistical support compared with bottleneck models. Although the proposed bottleneck is ancient, occurring at least 130 kya, we can discard the possibility that it did not leave detectable footprints in the DNA sequence data except if the bottleneck involves a less than a 3-fold reduction in population size. Finally, we confirm that a simple model without a bottleneck is able to reproduce the main features of the observed patterns of genetic variation. We conclude that models of Pleistocene refugium for modern human origins now require substantial revision.
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