Di Rienzo A, Wilson A C
Department of Molecular and Cell Biology, University of California, Berkeley 94720.
Proc Natl Acad Sci U S A. 1991 Mar 1;88(5):1597-601. doi: 10.1073/pnas.88.5.1597.
Eighty-eight types of mitochondrial (mt) DNA were found by sequencing the most variable part of the control region from 117 Caucasians. In the tree relating those types, most of the branching events occur about two-thirds of the way from the root of the tree to the tips of the branches. Moreover, the distribution of sequence differences between all possible pairs of individuals is approximately Poisson. Other non-African populations show a similar pattern. Assuming a neutral model, these findings imply that the probability of survival of new lineages has undergone dramatic changes, probably due to population expansion. Conversely, African populations show multimodal distributions fitting with a model of constant population size.
通过对117名高加索人的控制区最可变部分进行测序,发现了88种线粒体(mt)DNA类型。在与这些类型相关的树状图中,大多数分支事件发生在从树根到树枝末端大约三分之二的位置。此外,所有可能个体对之间的序列差异分布近似于泊松分布。其他非非洲人群也呈现出类似的模式。假设中性模型,这些发现意味着新谱系的生存概率发生了巨大变化,可能是由于种群扩张所致。相反,非洲人群呈现出符合恒定种群大小模型的多峰分布。