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Polymorphism and the induction/inhibition of drug-metabolizing enzymes, such as cytochrome P450, aldehyde dehydrogenase (ALDH), glutathione S-transferase (GST), N-acetyltransferase (NAT), and NAD(P)H-quinone oxidoreductase (NQO1), were reviewed in relation to susceptibility to disease and to inter-individual difference in biological monitorings. A number of genetic and acquired factors can influence the susceptibility of an individual to chemicals, creating a so-called predisposition. Most cases in which genetic factors were present resulted from polymorphism of drug-metabolizing enzymes. However, conflicting reports have appeared on the relationship between polymorphism and risk of disease; in some cases, biologically plausible mechanisms linking genotypes and disease are not yet in evidence. Current findings based on biological monitoring of chemicals are insufficient to evaluate the relationship between genetic polymorphism and acquired risk when exposure has occurred in an occupational area. Investigation of such situations has generated data implicating GSTT1, GSTM1, NAT2, and NQO1 polymorphisms in biological monitoring of some chemicals; the ALDH2 polymorphism is the likely link between the genotype and the metabolism of low molecular aliphatic aldehydes. Although this polymorphism is limited in the case of Japanese as well as other Asian subjects, the inhibitors of ALDH2 activity such as trichloroethylene may produce a false polymorphism of this gene. As to the effect of factors influencing acquired predisposition, such as ethanol intake, intake of low carbohydrate diet or diabetes, corroborative epidemiological studies may be further required.

Polymorphism of Drug-Metabolizing Enzymes in Relation to Individual Susceptibility to Industrial Chemicals.