Molecular Biology and Evolution, Vol 10, 1360-1369, Copyright © 1993 by Society for Molecular Biology and Evolution
MK Hughes and AL Hughes
To understand the evolution of duplicate genes, we compared rates of
nucleotide substitution between 17 pairs of nonallelic duplicated genes in
the tetraploid frog Xenopus laevis with rates between the orthologous loci
of human and rodent. For all duplicated X. laevis genes, the number of
synonymous substitutions per site (dS) was greater than the number of
nonsynonymous substitutions per site (dN), indicating that these genes are
subject to purifying selection. There was also a significant positive
correlation (r = 0.915) between dN for the X. laevis genes and dN for the
mammalian genes, suggesting that, at the amino acid level, the X. laevis
genes and the mammalian genes are under similar constraints. Results of
relative-rate tests showed nearly equal rates of nonsynonymous substitution
in each copy of the X. laevis genes; apparently there are similar
constraints on both copies. No correlation was found between dS for the X.
laevis genes and dS for the mammalian genes. There was a significant
positive correlation both between members of pairs of duplicated X. laevis
genes (r = 0.951) and between human and rodent orthologues (r = 0.854) with
respect to third- position G+C content but no such relationship between the
X. laevis genes and either of their mammalian orthologues. The results
indicate that both copies of a duplicate gene can be subject to purifying
selection and thus support the hypothesis of selection against all
genotypes containing a null allele at either of two duplicate loci.
ORIGINAL ARTICLE
Evolution of duplicate genes in a tetraploid animal, Xenopus laevis
Department of Biology, Pennsylvania State University, University Park 16802.
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