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(base substitutions|insertion / deletion differences|DNA
evolution)
California Institute of Technology, 101 Dahlia Avenue, Corona del
Mar, CA 92625
Contributed by Roy J. Britten, August 22, 2002
Five chimpanzee bacterial artificial chromosome (BAC) sequences
(described in GenBank) have been compared with the best matching regions of the human genome sequence to assay the amount and kind of
DNA divergence. The conclusion is the old saw that we share 98.5% of
our DNA sequence with chimpanzee is probably in error. For this sample,
a better estimate would be that 95% of the base pairs are exactly
shared between chimpanzee and human DNA. In this sample of 779 kb, the
divergence due to base substitution is 1.4%, and there is an
additional 3.4% difference due to the presence of indels. The gaps in
alignment are present in about equal amounts in the chimp and
human sequences. They occur equally in repeated and nonrepeated
sequences, as detected by REPEATMASKER (http://ftp.genome.washington.edu/RM/RepeatMasker.html).
Evolution
Divergence between samples of chimpanzee and human DNA sequences
is 5%, counting indels
*
E-mail: rbritten{at}cco.caltech.edu.
www.pnas.org/cgi/doi/10.1073/pnas.172510699
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