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Molecular basis of polymorphic drug metabolism

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Abstract

Genetic polymorphisms with functional effects occur in many of the genes encoding drug metabolizing enzymes and are an important cause of adverse drug reations. Recent advances in the understanding of the molecular genetics of drug-metabolizing enzymes, particularly the cytochromes P450, has enabled the molecular basis of several polymorphisms to be elucidated and genotyping assays using the polymerase chain reaction to be developed. Polymorphisms in this category include those in the cytochrome P450 genes CYP2D6, CYP2C19, CYP2A6, CYP2C9 and CYP2E1, the glutathione S-transferase genes GSTM1 and GSTT1 and the N-acetyltransferase gene NAT2. The molecular basis and impotance to drug metabolism of the various polymorphisms as well as evidence for the existence of polymorphisms in other genes encoding drug-metabolizing enzymes such as the UDP-glucuronosyltransferases, the sulphotransferases and the methyltransferases are discussed.

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Abbreviations

DHEA ST :

Dehydroepiandrosterone sulphotransferase

EST :

Oestrogen sulphotransferase

TL ST :

Thermolabile sulphotransferase

TS ST :

Thermostable sulphotransferase

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Daly, A.K. Molecular basis of polymorphic drug metabolism. J Mol Med 73, 539–553 (1995). https://doi.org/10.1007/BF00195139

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