Molecular Biology and Evolution, Vol 13, 1198-1212, Copyright © 1996 by Society for Molecular Biology and Evolution
M Moniz de Sa and G Drouin
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.
ORIGINAL ARTICLE
Phylogeny and substitution rates of angiosperm actin genes
Biology Department, University of Ottawa, ON, Canada.
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