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. 2003 Aug;164(4):1511–1518. doi: 10.1093/genetics/164.4.1511

Low nucleotide diversity in chimpanzees and bonobos.

Ning Yu 1, Michael I Jensen-Seaman 1, Leona Chemnick 1, Judith R Kidd 1, Amos S Deinard 1, Oliver Ryder 1, Kenneth K Kidd 1, Wen-Hsiung Li 1
PMCID: PMC1462640  PMID: 12930756

Abstract

Comparison of the levels of nucleotide diversity in humans and apes may provide much insight into the mechanisms of maintenance of DNA polymorphism and the demographic history of these organisms. In the past, abundant mitochondrial DNA (mtDNA) polymorphism data indicated that nucleotide diversity (pi) is more than threefold higher in chimpanzees than in humans. Furthermore, it has recently been claimed, on the basis of limited data, that this is also true for nuclear DNA. In this study we sequenced 50 noncoding, nonrepetitive DNA segments randomly chosen from the nuclear genome in 9 bonobos and 17 chimpanzees. Surprisingly, the pi value for bonobos is only 0.078%, even somewhat lower than that (0.088%) for humans for the same 50 segments. The pi values are 0.092, 0.130, and 0.082% for East, Central, and West African chimpanzees, respectively, and 0.132% for all chimpanzees. These values are similar to or at most only 1.5 times higher than that for humans. The much larger difference in mtDNA diversity than in nuclear DNA diversity between humans and chimpanzees is puzzling. We speculate that it is due mainly to a reduction in effective population size (N(e)) in the human lineage after the human-chimpanzee divergence, because a reduction in N(e) has a stronger effect on mtDNA diversity than on nuclear DNA diversity. Sequence data from this article have been deposited with the GenBank Data libraries under accession nos. AY 275957-AY 277244.

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