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. 1981 Apr;78(4):2432–2436. doi: 10.1073/pnas.78.4.2432

Evolutionary tree for apes and humans based on cleavage maps of mitochondrial DNA.

S D Ferris, A C Wilson, W M Brown
PMCID: PMC319360  PMID: 6264476

Abstract

The high rate of evolution of mitochondrial DNA makes this molecule suitable for genealogical research on such closely related species as humans and apes. Because previous approaches failed to establish the branching order of the lineages leading to humans, gorillas, and chimpanzees, we compared human mitochondrial DNA to mitochondrial DNA from five species of ape (common chimpanzee, pygmy chimpanzee, gorilla, orangutan, and gibbon). About 50 restriction endonuclease cleavage sites were mapped in each mitochondrial DNA, and the six maps were aligned with respect to 11 invariant positions. Differences among the maps were evident at 121 positions. Both conserved and variable sites are widely dispersed in the mitochondrial genome. Besides site differences, ascribed to point mutations, there is evidence for one rearrangement: the gorilla map is shorter than the other owing to the deletion of 95 base pairs near the origin of replication. The parsimony method of deriving all six maps from a common ancestor produced a genealogical tree in which the common and pygmy chimpanzee maps are the most closely related pair; the closest relative of this pair is the gorilla map; most closely related to this trio is the human map. This tree is only slightly more parsimonious than some alternative trees. Although this study has given a magnified view of the genetic differences among humans and apes, the possibility of a three-way split among the lineages leading to humans, gorillas, and chimpanzees still deserves serious consideration.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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