Molecular Biology and Evolution, Vol 14, 230-238, Copyright © 1997 by Society for Molecular Biology and Evolution
B Angers and L Bernatchez
Sequence analysis of 78 alleles of a microsatellite locus was resolved at
various taxonomic levels among salmonid fishes to test for congruence
between size and sequence information. Allelic variability of this locus
involved changes in number of dinucleotide repeats as expected for
microsatellite loci. However, additional mutational events involving large
indels and base substitutions also occurred frequently among and within
species. These caused the evolution of different imperfect microsatellite
variants, from an ancestral perfect one, which was undetectable from
allelic size information only. Alleles of the same length resulting from
different mutational events were also observed among and within species.
Altogether, these results revealed the incongruence between size and number
of mutation events, implying that it may be imprecise to interpret
mutational rates and relationships on the basis of size information alone
in interspecific comparisons and, to a lesser extent, within species.
ORIGINAL ARTICLE
Complex evolution of a salmonid microsatellite locus and its consequences in inferring allelic divergence from size information
Departement des sciences de l'environnement, Universite du Quebec a Montreal, Canada.
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