Abstract
Codon usage patterns and phylogenetic relationships in the actin multigene family have been analyzed for three dipteran species—Drosophila melanogaster, Bactrocera dorsalis, and Ceratitis capitata. In certain phylogenetic tree reconstructions, using synonymous distances, some gene relationships are altered due to a homogenization phenomenon. We present evidence to show that this homogenization phenomenon is due to codon usage bias. A survey of the pattern of synonymous codon preferences for I I actin genes from these three species reveals that five out of the six Drosophila actin genes show high degrees of codon bias as indicated by scaled Ξ2 values. In contrast to this, four out of the five actin genes from the other species have low codon bias values. A Monte Carlo contingency test indicates that for those Drosophila actin genes which exhibit codon bias, the patterns of codon usage are different compared to actin genes from the other species. In addition, the genes exhibiting codon bias also appear to have reduced rates of synonymous substitution. The homogenization phenomenon seen in terms of synonymous substitutions is not observed for nonsynonymous changes. Because of this homogenization phenomenon, “trees” constructed based on synonymous substitutions will be affected. These effects can be overt in the case of multigene families, but similar distortions may underlie reconstructions based on single-copy genes which exhibit codon usage bias.
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Correspondence to: M. He
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He, M., Haymer, D.S. Codon bias in actin multigene families and effects on the reconstruction of phylogenetic relationships. J Mol Evol 41, 141–149 (1995). https://doi.org/10.1007/BF00170665
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DOI: https://doi.org/10.1007/BF00170665