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Molecular Biology and Evolution, Vol 8, 115-127, Copyright © 1991 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

The relative rate of DNA evolution in primates

S Easteal
Human Genetics Group, John Curtin School of Medical Research, Australian National University.

In 73 relative-rate tests involving the sequences of 17 genes between humans and six nonhuman primate taxa, there is only one significant (P less than 0.01) difference in evolutionary rate--i.e., that between human and Old World-monkey psi eta-globin genes. No evolutionary rate difference between humans and Old World monkeys is evident from analysis of 18 other genes with a total length of 6 kb. This and the comparison, between humans and other primate taxa, of new extended psi eta-globin sequences suggest that earlier observations of evolutionary- rate differences between humans and other primates were based on differences that are peculiar to psi eta-globin and that are not representative of the whole genome, which appears to be evolving at a stochastically uniform rate. This is supported by whole-genome single- copy DNA and mitochondrial DNA comparisons, neither of which shows any evidence of evolutionary-rate variation among primate taxa. Uniformity in the evolutionary rate of the DNA of primate and other mammalian taxa is inconsistent with current mammalian fossil-record interpretation. Either there has been a general slowing down in rate across lineages or the fossil record has been misinterpreted.
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