Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
Clin Chim Acta. 2007 Aug;383(1-2):158-62. Epub 2007 May 18.

Genetic polymorphisms of CYP3A4: CYP3A4*18 allele is found in five healthy Malaysian subjects.

Author information

  • 1Department of Pharmacology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, Malaysia. tieimran@yahoo.com



Cytochrome P450 3A4 (CYP3A4) is the major cytochrome involved in metabolizing of >60% of all drugs used in humans. A number of allelic variations in CYP3A4 gene are known to affect catalytic activity including CYP3A4*4, CYP3A4*5 and CYP3A4*18. We investigated the frequencies of CYP3A4*4, CYP3A4*5 and CYP3A4*18 alleles in a Malaysian population. This will impact treatment of patients receiving drugs metabolized by these alleles.


The study was conducted in 121 healthy Malaysian volunteers. DNA was extracted from leucocytes and the 3 alleles were determined by PCR-RFLP. The PCR product was later digested with restriction enzymes BstMA I, BshV I and Hpa II.


No mutations were detected for CYP3A4*4 and CYP3A4*5 alleles. The frequency of the CYP3A4*18 allele in the Malaysian population is 2.1%. All 5 subjects with CYP3A4*18 mutations were found to be heterozygous.


The present study describes polymorphisms of CYP3A4 among Malaysian subjects. Clinical relevance of these genetic variants in these healthy volunteers is under investigation.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk