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Science 19 August 1994:
Vol. 265. no. 5175, pp. 1087 - 1090
DOI: 10.1126/science.8066445
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Articles

Science, Vol 265, Issue 5175, 1087-1090
Copyright © 1994 by American Association for the Advancement of Science

articles

Disparate rates of molecular evolution in cospeciating hosts and parasites

MS Hafner, PD Sudman, FX Villablanca, TA Spradling, JW Demastes, and SA Nadler

Museum of Natural Science, Baton Rouge, LA.

DNA sequences for the gene encoding mitochondrial cytochrome oxidase I in a group of rodents (pocket gophers) and their ectoparasites (chewing lice) provide evidence for cospeciation and reveal different rates of molecular evolution in the hosts and their parasites. The overall rate of nucleotide substitution (both silent and replacement changes) is approximately three times higher in lice, and the rate of synonymous substitution (based on analysis of fourfold degenerate sites) is approximately an order of magnitude greater in lice. The difference in synonymous substitution rate between lice and gophers correlates with a difference of similar magnitude in generation times.


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