Janecka Jan E, Miller Webb, Pringle Thomas H, Wiens Frank, Zitzmann Annette, Helgen Kristofer M, Springer Mark S, Murphy William J
Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843, USA.
Science. 2007 Nov 2;318(5851):792-4. doi: 10.1126/science.1147555.
A full understanding of primate morphological and genomic evolution requires the identification of their closest living relative. In order to resolve the ancestral relationships among primates and their closest relatives, we searched multispecies genome alignments for phylogenetically informative rare genomic changes within the superordinal group Euarchonta, which includes the orders Primates, Dermoptera (colugos), and Scandentia (treeshrews). We also constructed phylogenetic trees from 14 kilobases of nuclear genes for representatives from most major primate lineages, both extant colugos, and multiple treeshrews, including the pentail treeshrew, Ptilocercus lowii, the only living member of the family Ptilocercidae. A relaxed molecular clock analysis including Ptilocercus suggests that treeshrews arose approximately 63 million years ago. Our data show that colugos are the closest living relatives of primates and indicate that their divergence occurred in the Cretaceous.
对灵长类动物形态学和基因组进化的全面理解需要确定它们现存的最近亲缘物种。为了解决灵长类动物与其最近亲缘物种之间的祖先关系，我们在多物种基因组比对中搜索了真灵长大目（Euarchonta）内系统发育信息丰富的罕见基因组变化，真灵长大目包括灵长目、皮翼目（鼯猴）和树鼩目。我们还从大多数主要灵长类谱系、现存的两种鼯猴以及多种树鼩（包括笔尾树鼩，即树鼩科唯一现存成员）的代表物种的14千碱基核基因构建了系统发育树。包括笔尾树鼩在内的宽松分子钟分析表明，树鼩大约在6300万年前出现。我们的数据表明，鼯猴是灵长类动物现存的最近亲缘物种，并表明它们的分化发生在白垩纪。
