C3 polymorphism and NADH diaphorase types in Sardinia (Italy).

: C3 and DIA1 types were studied in Sardinians from four provinces. C3 showed a heterogeneous distribution in the four subsamples and C3*F gene varied between 0.235 (Province of Sassari) and 0.154 (Province of Oristano). No rare types were found in Sardinia in contrast to mainland Italy. There are significant differences compared with some Italian populations on the mainland. DIA1*2 allele varies between 0.0026 (Province of Cagliari) and 0.0157 (Province of Nuoro). Also DIA1 showed a heterogenous distribution.