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Research ArticleArticle

TWO NEW POLYMORPHISMS OF THE FMO3 GENE IN CAUCASIAN AND AFRICAN-AMERICAN POPULATIONS: COMPARATIVE GENETIC AND FUNCTIONAL STUDIES

Virginie Lattard, Jun Zhang, Quyen Tran, Bjarte Furnes, Daniel Schlenk and John R. Cashman
Drug Metabolism and Disposition July 2003, 31 (7) 854-860; DOI: https://doi.org/10.1124/dmd.31.7.854
Virginie Lattard
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Jun Zhang
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Quyen Tran
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Bjarte Furnes
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Daniel Schlenk
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John R. Cashman
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This article has a correction. Please see:

  • CORRECTION TO “TWO NEW POLYMORPHISMS OF THE FMO3 GENE IN CAUCASIAN AND AFRICAN-AMERICAN POPULATIONS: COMPARATIVE GENETIC AND FUNCTIONAL STUDIES” - February 01, 2004

Abstract

To characterize the contribution of the human flavin-containing monooxygenase form 3 (FMO3) in the metabolism and disposition of drugs and xenobiotics, we determined the single nucleotide polymorphisms in the coding region and adjacent splice junctions of FMO3 in 134 African Americans and 120 Caucasians from the United States. In the regions examined, DNA resequencing or high throughput MassEXTEND studies coupled with mass spectrometric genotyping showed that 12 sites of variation were present. Three variants encoding synonymous mutations and four polymorphisms were observed in the noncoding region. Another three variants, Lys158-FMO3, Met257-FMO3 and Gly308-FMO3, previously reported in similar populations, were prominent polymorphisms. Two new polymorphisms, His132-FMO3 and Pro360-FMO3, were identified in this study. Both variants were found only in African Americans. To evaluate the effect of the amino acid substitutions on the function of FMO3, each amino acid substitution was introduced by site-directed mutagenesis into a wild-type FMO3 cDNA. Selective functional activity was studied with methimazole, trimethylamine, and 10-(N,N-dimethylaminopentyl)-2-(trifluoromethyl) phenothiazine. Both His132-FMO3 and Pro360-FMO3 variants were able to metabolize the substrates examined. Compared with wild-type FMO3, the His132-FMO3 was less catalytically efficient. The His132-FMO3 variant moderately altered the catalytic efficiency of FMO3 (decrease of 30%, 60% and 6% with methimazole, trimethylamine and 10-(N,N-dimethylaminopentyl)-2-(trifluoromethyl)phenothiazine, respectively). The Pro360-FMO3 variant was more catalytically efficient than wild-type FMO3. Pro360-FMO3 oxygenated methimazole, trimethylamine and 10-(N,N-dimethylaminopentyl)-2-(trifluoromethyl)phenothiazine, respectively, 3-, 5- and 2-fold more efficiently than wild-type FMO3. Based on the functional activity of the variant FMO3 enzymes, it is likely that population differences exist for compounds primarily metabolized by FMO3.

Footnotes

  • ↵1 Abbreviations used are: FMO, flavin-containing monooxygenase; SNP, single nucleotide polymorphism; TMA, trimethylamine; 5-DPT, 10-(N,N-dimethylaminopentyl)-2-(trifluoromethyl) phenothiazine; MBP, maltose-binding protein.

  • The financial support of the National Institutes of Health (Grant DK59618) and the California State Tobacco Related Disease Program (Grant 9RT-0196) is gratefully acknowledged.

    • Received January 13, 2003.
    • Accepted March 24, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 31 (7)
Drug Metabolism and Disposition
Vol. 31, Issue 7
1 Jul 2003
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Research ArticleArticle

TWO NEW POLYMORPHISMS OF THE FMO3 GENE IN CAUCASIAN AND AFRICAN-AMERICAN POPULATIONS: COMPARATIVE GENETIC AND FUNCTIONAL STUDIES

Virginie Lattard, Jun Zhang, Quyen Tran, Bjarte Furnes, Daniel Schlenk and John R. Cashman
Drug Metabolism and Disposition July 1, 2003, 31 (7) 854-860; DOI: https://doi.org/10.1124/dmd.31.7.854

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Research ArticleArticle

TWO NEW POLYMORPHISMS OF THE FMO3 GENE IN CAUCASIAN AND AFRICAN-AMERICAN POPULATIONS: COMPARATIVE GENETIC AND FUNCTIONAL STUDIES

Virginie Lattard, Jun Zhang, Quyen Tran, Bjarte Furnes, Daniel Schlenk and John R. Cashman
Drug Metabolism and Disposition July 1, 2003, 31 (7) 854-860; DOI: https://doi.org/10.1124/dmd.31.7.854
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