To examine the possible internal heterogeneity within the Basque population, nine samples typed for several HLA loci were compiled and HLA-A, B, C and DR loci were analysed. First, the shared features of HLA in Basques were analysed by principal component analysis and genetic distances. Two major Basque dialect groups ('French' and 'Spanish') were considered. FST statistics were computed and corrected for sampling intensity. The dialectal and political division did not seem to differentiate these two groups genetically. Analysis of Molecular Variance also failed to show consistently significant genetic variance components between French and Spanish Basques. Thus, in this particular example, linguistic diversity does not seem to correlate with a genetic stratification.
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