We analysed samples of 400 Finnish males using nine Y-chromosomal short tandem repeat (STR) loci (minimal haplotype);
for 200 of these subjects an additional seven Y-chromosomal STR loci were used. The geographical distribution of the observed
haplotypes was determined from 200 individuals of known paternal origin within Finland. The observed number of alleles varied
from 2 to 13 alleles per locus. A total of 146 minimal haplotypes were identified in our population sample. Interestingly, 90
(22.5%) individuals shared an identical haplotype. This haplotype was extremely frequent in the northern and eastern
subpopulations of Savo, Pohjanmaa and Karjala (53, 42 and 37%, respectively). With the seven additional loci analysed in
the sample of 200 individuals, 120 haplotypes were identified, and individuals sharing the most common haplotype decreased to
13.0%. However, in comparison to other European populations, the Finnish population showed decreased genetic diversity (GD)
when the number of different minimal haplotypes in the population was divided by the sample size (36.5% in Finns versus 83.7%
on average). Our results strongly support the earlier hypothesis of individual isolated Y-chromosomal lineages and population
substructuring in Finland. For paternity testing, power of exclusion was 92% using minimal haplotype data, but including the
seven additional loci this value increased to 97%.
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