Variation in the molecular clock of primates
Events in primate evolution are often dated by assuming a constant rate of substitution per unit time, but the validity of this assumption remains unclear. Among mammals, it is well known that there exists substantial variation in yearly substitution rates. Such variation is to be expected from diff...
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| Published in: | Proceedings of the National Academy of Sciences - PNAS Vol. 113; no. 38; pp. 10607 - 10612 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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United States
20.09.2016
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| ISSN: | 1091-6490 |
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| Abstract | Events in primate evolution are often dated by assuming a constant rate of substitution per unit time, but the validity of this assumption remains unclear. Among mammals, it is well known that there exists substantial variation in yearly substitution rates. Such variation is to be expected from differences in life history traits, suggesting it should also be found among primates. Motivated by these considerations, we analyze whole genomes from 10 primate species, including Old World Monkeys (OWMs), New World Monkeys (NWMs), and apes, focusing on putatively neutral autosomal sites and controlling for possible effects of biased gene conversion and methylation at CpG sites. We find that substitution rates are up to 64% higher in lineages leading from the hominoid-NWM ancestor to NWMs than to apes. Within apes, rates are ∼2% higher in chimpanzees and ∼7% higher in the gorilla than in humans. Substitution types subject to biased gene conversion show no more variation among species than those not subject to it. Not all mutation types behave similarly, however; in particular, transitions at CpG sites exhibit a more clocklike behavior than do other types, presumably because of their nonreplicative origin. Thus, not only the total rate, but also the mutational spectrum, varies among primates. This finding suggests that events in primate evolution are most reliably dated using CpG transitions. Taking this approach, we estimate the human and chimpanzee divergence time is 12.1 million years, and the human and gorilla divergence time is 15.1 million years. |
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| AbstractList | Events in primate evolution are often dated by assuming a constant rate of substitution per unit time, but the validity of this assumption remains unclear. Among mammals, it is well known that there exists substantial variation in yearly substitution rates. Such variation is to be expected from differences in life history traits, suggesting it should also be found among primates. Motivated by these considerations, we analyze whole genomes from 10 primate species, including Old World Monkeys (OWMs), New World Monkeys (NWMs), and apes, focusing on putatively neutral autosomal sites and controlling for possible effects of biased gene conversion and methylation at CpG sites. We find that substitution rates are up to 64% higher in lineages leading from the hominoid-NWM ancestor to NWMs than to apes. Within apes, rates are ∼2% higher in chimpanzees and ∼7% higher in the gorilla than in humans. Substitution types subject to biased gene conversion show no more variation among species than those not subject to it. Not all mutation types behave similarly, however; in particular, transitions at CpG sites exhibit a more clocklike behavior than do other types, presumably because of their nonreplicative origin. Thus, not only the total rate, but also the mutational spectrum, varies among primates. This finding suggests that events in primate evolution are most reliably dated using CpG transitions. Taking this approach, we estimate the human and chimpanzee divergence time is 12.1 million years, and the human and gorilla divergence time is 15.1 million years. |
| Author | Moorjani, Priya Arndt, Peter F Amorim, Carlos Eduardo G Przeworski, Molly |
| Author_xml | – sequence: 1 givenname: Priya surname: Moorjani fullname: Moorjani, Priya email: pm2730@columbia.edu, mp3284@columbia.edu organization: Department of Biological Sciences, Columbia University, New York, NY 10027; Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Cambridge, MA 02142; pm2730@columbia.edu mp3284@columbia.edu – sequence: 2 givenname: Carlos Eduardo G surname: Amorim fullname: Amorim, Carlos Eduardo G organization: Department of Biological Sciences, Columbia University, New York, NY 10027 – sequence: 3 givenname: Peter F surname: Arndt fullname: Arndt, Peter F organization: Department of Computational Molecular Biology, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany – sequence: 4 givenname: Molly surname: Przeworski fullname: Przeworski, Molly email: pm2730@columbia.edu, mp3284@columbia.edu organization: Department of Biological Sciences, Columbia University, New York, NY 10027; Department of Systems Biology, Columbia University, New York, NY 10027 pm2730@columbia.edu mp3284@columbia.edu |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/27601674$$D View this record in MEDLINE/PubMed |
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| Keywords | CpG transition rate human–ape divergence time mutation rate molecular clock primate evolution |
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| SubjectTerms | Amino Acid Substitution - genetics Animals Biological Evolution DNA Methylation - genetics Evolution, Molecular Gene Conversion - genetics Genetic Variation Genome - genetics Gorilla gorilla - genetics Humans Pan troglodytes - genetics Primates - genetics |
| Title | Variation in the molecular clock of primates |
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