Molecular Biology and Evolution 19:122-125 (2002)
© 2002 Society for Molecular Biology and Evolution
Direct Estimation of Mutation Rate for 10 Microsatellite Loci in Durum Wheat, Triticum turgidum (L.) Thell. ssp durum desf
INRA-Station de Génétique et d'Amélioration des Plantes, Mauguio, Domaine de Melgueil, France;
INRA, Unité Génome, Station d'Amélioration des Plantes Domaine de Crouël, Clermont-Ferrand, France
Microsatellites are defined as tandemly repeated DNA sequences of 1–6 base pairs (bp). They are characterized by their repeated motif and their number of repeats. Because of their high level of variability in comparison with other neutral markers and because of their codominance, they have become widely used for mapping (Dib et al. 1996
; Röder et al. 1998
) and for studies of population genetics (Jarne and Lagoda 1996
). Microsatellites represent a particular kind of mutation process by which the ancestral and the mutant alleles differ by a few repeats. Two mutation mechanisms are considered for repeated sequences: slippage of the DNA polymerase or unequal crossing-over (Sia et al. 1997
). The first one generates additions or losses of one or a few repeat unit(s), whereas unequal crossing-over could lead to changes of several repeat units. Slippage of the DNA polymerase seems to play a major role in
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