POLYMORPHIC DISTRIBUTION OF GLUTATHIONE TRANSFERASE-ACTIVITY WITH METHYL-CHLORIDE IN HUMAN BLOOD

Interindividual variation in the in vitro conjugation of methyl chlori de with glutathione by erythrocyte glutathione transferase was investi gated in 208 healthy males and females from the southern and central p arts of Sweden. It was found that 11.1% of the individuals lacked this activity, whereas 46.2% had intermediate activity and 42.8% had high activity. This distribution of three phenotypes is compatible with the presence of one functional allele with a gene frequency of 0.659 and one defect allele with a gene frequency of 0.341. The proportion of no n-conjugators in this Swedish material was considerably smaller than t hat previously found in Germany (Peter ct al., Arch Toxicol 1989: 63, 351-355). The polymorphic distribution of another glutathione transfer ase, GST mu, was determined in the same individuals with a PCR method. No connection between the genotype for GST mu (GSTM1) and the glutati one conjugation with methyl chloride in erythrocytes was found.