Molecular Biology and Evolution, Vol 13, 1054-1057, Copyright © 1996 by Society for Molecular Biology and Evolution
G Herbert and S Easteal
Rates of substitution were compared between humans and Old World monkeys
for sequences in or adjacent to 19 genes. The comparison of 21,299 sites in
noncoding regions indicates that the substitution rate is approximately 43%
greater in the Old World monkey lineage. However, 83% of the compared sites
are in the region of the beta-globin gene family. Outside this region there
is no consistent pattern of rate difference between the two lineages.
Comparison of the coding regions of 16 genomically dispersed genes,
involving 1,592 synonymous sites and 5,275 nonsynonymous sites, showed a
faster rate of substitution in the human lineage at the nonsynonymous sites
of the prion gene, but otherwise no evidence of rate difference between the
two lineages. It is concluded that rate differences between these two
lineages may be specific to certain regions of the genome rather than being
a general phenomenon. This conclusion needs to be confirmed by comparison
of a larger number of genomically dispersed sequences. It is, however,
consistent with the results of DNA-DNA hybridization experiments, which
show no difference in evolutionary rate between the two lineages.
ORIGINAL ARTICLE
Relative rates of nuclear DNA evolution in human and Old World monkey lineages
John Curtin School of Medical Research, Australian National University, Canberra, Australia.
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