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Molecular Biology and Evolution, Vol 13, 1198-1212, Copyright © 1996 by Society for Molecular Biology and Evolution


ORIGINAL ARTICLE

Phylogeny and substitution rates of angiosperm actin genes

M Moniz de Sa and G Drouin
Biology Department, University of Ottawa, ON, Canada.

Forty-four actin genes from five angiosperm species were PCR-amplified, cloned, and sequenced. Phylogenetic analysis of 34 of these actins, along with those previously published, indicates that angiosperm actin genes are monophyletic and underwent several duplications during evolution. Orthologues have been identified between Solanaceae species, as well as between Solanaceae species and soybean. These sequences were used to calculate nucleotide substitution rates. The synonymous rate (6.96 x 10(-9) substitutions/site/year) is similar to that of other nuclear protein-coding genes, but the nonsynonymous rate (0.19 x 10(-9) substitutions/site/year) is 6-19 times higher than that of mammalian actin genes. Relative rate tests indicate that actin genes are evolving at similar rates in monocots and in dicots. Evidence is also presented that some members of the maize actin multigene family have been involved in gene conversion events, that the potato genome contains 24 +/- 12 actin genes, and that potato and tomato diverged 11.6 +/- 3.6 MYA.
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