Geographic homogeneity and non-equilibrium patterns of mtDNA sequences in Tuscany, Italy.
The geographical distribution of 49 mtDNA sequences from 22 localities in Southern Tuscany, Italy, was studied by molecular analysis of variance, by a new spatial autocorrelation statistic specifically designed for sequence data and by reconstructing genealogies of haplotypes. All these methods indicated a high homogeneity of populations. Nevertheless, genetic variability showed significant departure from equilibrium expectations, in agreement with the predicted effects of a population expansion. We suggest that a past population expansion that was probably associated with a migrational wave and with local gene flow between localities prevented spatial structuring in Southern Tuscany.
Bertorelle
G
G
Dipartimento di Biologia, Università di Padova, Italy.
Calafell
F
F
Francalacci
P
P
Bertranpetit
J
J
Barbujani
G
G
D000704:Analysis of Variance; D004272:DNA, Mitochondrial / Q000235:genetics*; D004641:Emigration and Immigration; D019143:Evolution, Molecular; D014644:Genetic Variation; D005828:Genetics, Population; D006239:Haplotypes; D006801:Humans; D007558:Italy
D004272:DNA, Mitochondrial