Multispecies coalescent analysis of the early diversification of neotropical primates: phylogenetic inference under strong gene trees/species tree conflict.
Bottom Line: However, despite major efforts, the phylogenetic relationship between these three major clades and the age of their last common ancestor are still controversial because these inferences were based on limited numbers of loci and dating analyses that did not consider the evolutionary variation associated with the distribution of gene trees within the proposed phylogenies.We show, by multispecies coalescent analyses of selected genome segments, spanning along 92,496,904 bp that the early diversification of extant NP was marked by a 2-fold increase of their effective population size and that Atelids and Cebids are more closely related respective to Pitheciids.This approach, based on extensive genomic data provided by new generation DNA sequencing, provides more accurate reconstructions of phylogenies and timescales for all organisms.
Affiliation: Department of Genetics, Federal University of Rio de Janeiro, Brazil.Show MeSH
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Mentions: The average genetic divergence between New World and Old World anthropoids was inferred as 38.4 Ma, with 95% HPD interval ranging from 26.9 to 54.7 Ma. The age of the LCA of extant NP was estimated as 22.9 Ma (15.8–33.0) (fig. 4). The split between the Cebidae and Atelidae occurred roughly 1 Myr after the basal diversification of living platyrrhines, at 21.5 Ma (15.0–31.3). The average rate of molecular evolution was inferred as 1.4 × 10−9 substitutions/site/year (s/s/y). Assuming this rate, the age of complete genetic isolation between cebids and atelids was inferred at 15.2 Ma and the age of the LCA of living NP at 17.2 Ma. Finally, the complete genetic isolation between platyrrhines and catarrhines occurred at 27.5 Ma (table 2).Fig. 4.—
Affiliation: Department of Genetics, Federal University of Rio de Janeiro, Brazil.