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Functional characterization of human N-acetyltransferase 2 (NAT2) single nucleotide polymorphisms
A J Fretland1, M A Leff, M A Doll
1Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40292, USA.
Pharmacogenetics
|May 8, 2001
Summary
Genetic variations in N-acetyltransferase 2 (NAT2) influence drug metabolism and cancer risk. This study clarifies how specific NAT2 gene polymorphisms affect enzyme activity and protein stability, revealing mechanisms behind slow acetylator phenotypes.
Area of Science:
- Pharmacogenomics
- Molecular Biology
- Biochemistry
Background:
- N-acetyltransferase 2 (NAT2) is crucial for metabolizing drugs and carcinogens.
- NAT2 gene polymorphisms are linked to drug toxicities and cancer.
- The functional impact of NAT2 coding region single nucleotide polymorphisms (SNPs) on enzyme activity and protein levels remains unclear.
Purpose of the Study:
- To investigate the functional consequences of 11 identified SNPs in the NAT2 coding region.
- To determine the effects of these SNPs on NAT2 protein expression, stability, and catalytic activity.
Main Methods:
- Cloned and expressed reference NAT2*4 and NAT2 variant alleles with individual SNPs in yeast (Schizosaccharomyces pombe).
- Assessed catalytic activity for N-acetylation of sulfamethazine and 2-aminofluorene.
- Measured NAT2 protein expression, stability, and mRNA levels.
Main Results:
- Specific NAT2 variants (G191A, T341C, A434C, G590A, A845C, G857A) showed reduced catalytic activity.
- Variants T341C, A434C, and G590A exhibited reduced NAT2 protein expression.
- Variants G191A, A845C, G857A, and G590A displayed decreased protein stability.
Conclusions:
- Identified specific mechanisms contributing to slow acetylator phenotypes.
- Clarified the distinct effects of individual NAT2 SNPs on human NAT2 expression, stability, and catalytic function.
- Provided a clearer understanding of NAT2 genetic variations in drug metabolism and disease susceptibility.