Primate phylogeny, evolutionary rate variations, and divergence times : a contribution from the nuclear gene IRBP

作者: C�line Poux , Emmanuel J.P. Douzery

DOI: 10.1002/AJPA.10322

关键词: PlatyrrhiniPhylogenetic treeCatarrhiniBiologyTarsiiformesGeneticsMolecular clockStrepsirrhiniAnthropoideaPaenungulata

摘要: The first third (ca. 1200 bp) of exon 1 the nuclear gene encoding interstitial retinoid-binding protein (IRBP) has been sequenced for 12 representative primates belonging to Lemuriformes, Lorisiformes, Tarsiiformes, Platyrrhini, and Catarrhini, combined with available data (13 other primates, 11 nonprimate placentals, 2 marsupials). Phylogenetic analyses using maximum likelihood on nucleotides amino acids robustly support monophyly Strepsirrhini, Anthropoidea, Platyrrhini. It is interesting note that 1) Tarsiidae grouped this node depends molecular characters considered; 2) Cheirogaleidae within Lemuriformes; 3) Daubentonia was sister group all Lemuriformes. Study IRBP evolutionary rate shows a high heterogeneity placentals also primates. Maximum local clocks were assigned three clades displaying significantly contrasted rates. Paenungulata shown evolve 2.5-3 times faster than Perissodactyla Six independent calibration points used estimate splitting ages main primate clades, their compatibility evaluated. Divergence obtained following crown groups: 13.8-14.2 MY 26.5-27.2 Lemuroidea, 39.6-40.7 45.4-46.7 56.7-58.4 Haplorrhini. incompatibility between some paleontological estimates may reflect incompleteness placental fossil record, and/or indicate variable rates are not fully accommodated by clocks.

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