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Related Experiment Videos

Linkage between the CYP2C8 and CYP2C9 genetic polymorphisms.

Umit Yasar1, Stefan Lundgren, Erik Eliasson

  • 1Department of Medical Laboratory Sciences and Technology, Division of Clinical Pharmacology, Karolinska Institutet, Huddinge University Hospital, Stockholm, Sweden.

Biochemical and Biophysical Research Communications
|November 19, 2002
PubMed
Summary

Genetic variations in Cytochrome P450 (CYP) 2C8 and 2C9 enzymes, specifically CYP2C8*3 and CYP2C9*2, are common in Caucasians. These variants show a strong association, impacting drug metabolism and potentially arachidonic acid pathways.

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Area of Science:

  • Pharmacogenomics
  • Enzyme kinetics
  • Human genetics

Background:

  • Cytochrome P450 (CYP) 2C8 and 2C9 are key polymorphic enzymes involved in drug metabolism.
  • Variant alleles, such as CYP2C8*3 and CYP2C9*2, are prevalent in Caucasian populations and can lead to impaired enzyme function.
  • Understanding the prevalence and association of these variants is crucial for personalized medicine and drug efficacy.

Purpose of the Study:

  • To determine the frequencies of CYP2C8 and CYP2C9 variant alleles in a Caucasian population.
  • To investigate the association between CYP2C8*3 and CYP2C9*2 alleles.
  • To assess the clinical implications of these genetic variations on drug metabolism.

Main Methods:

  • Genotyping of 1468 subjects from the Stockholm Heart Epidemiology Program (SHEEP) using allelic discrimination and a 5'-nuclease assay.

Related Experiment Videos

  • Analysis of CYP2C8 (*1, *3) and CYP2C9 (*1, *2, *3) variant alleles.
  • Statistical analysis to determine allele frequencies and assess associations between variants.

    • Main Results:

    • Allele frequencies were determined: CYP2C8*1 (0.91), CYP2C8*3 (0.095), CYP2C9*1 (0.83), CYP2C9*2 (0.11), and CYP2C9*3 (0.066).
    • A significant positive association was observed between CYP2C8*3 and CYP2C9*2 alleles; 96% of subjects with CYP2C8*3 also carried CYP2C9*2, and 85% with CYP2C9*2 carried CYP2C8*3.
    • The co-occurrence of CYP2C8*1*3 and CYP2C9*1*2 was 4.5-fold higher than expected, suggesting a strong genetic linkage.

    Conclusions:

    • The study identifies a strong association between CYP2C8*3 and CYP2C9*2 variant alleles in Caucasians.
    • This linkage has potential implications for the metabolism of substrates common to both enzymes, such as arachidonic acid.
    • Further research is warranted to explore the functional consequences of this association on drug response and physiological processes.