BACKGROUND: CYP2C9 3 (1075A/C) is an inherited single nuclear polymorphism (SNP) of cytochrome P450 (CYP) 2C9, which affects the activity of the enzyme. In vitro studies with several drugs have indicated that the CYP2C9 3 variant has an impaired capacity for drug metabolism. Therefore an efficient detection assay for this mutation may be important for clinical dose adjustment. OBJECTIVE: The aim of this work was to develop an appropriate tool for detection of the CYP2C9 3 polymorphism in the clinical laboratory. STUDY DESIGN: The previously described TaqMan mismatch amplification mutation assay (TaqMAMA) was modified to a primer-special (PS)-TaqMan PCR to satisfy the high-throughput requirements of a clinical laboratory. 404 genomic DNA samples from South Chinese individuals were genotyped to test the detection system. The results were checked by bi-directional sequencing. RESULTS: PS-TaqMan PCR could correctly genotype the CYP2C9 allele from a genomic template at a concentration of 1 x 104 to 1 x 1011 copies/PCR. Among the 404 genomic DNA samples, 24 heterozygotes and 380 wild-type homozygotes were detected and confirmed by bi-directional sequencing. CONCLUSION: PS-TaqMan PCR was successfully developed for CYP2C9 3 detection. This efficient, reliable, high-throughput tool could satisfy the requirements of a clinical laboratory test.
BACKGROUND:CYP2C9 3 (1075A/C) is an inherited single nuclear polymorphism (SNP) of cytochrome P450 (CYP) 2C9, which affects the activity of the enzyme. In vitro studies with several drugs have indicated that the CYP2C9 3 variant has an impaired capacity for drug metabolism. Therefore an efficient detection assay for this mutation may be important for clinical dose adjustment. OBJECTIVE: The aim of this work was to develop an appropriate tool for detection of the CYP2C9 3 polymorphism in the clinical laboratory. STUDY DESIGN: The previously described TaqMan mismatch amplification mutation assay (TaqMAMA) was modified to a primer-special (PS)-TaqMan PCR to satisfy the high-throughput requirements of a clinical laboratory. 404 genomic DNA samples from South Chinese individuals were genotyped to test the detection system. The results were checked by bi-directional sequencing. RESULTS: PS-TaqMan PCR could correctly genotype the CYP2C9 allele from a genomic template at a concentration of 1 x 104 to 1 x 1011 copies/PCR. Among the 404 genomic DNA samples, 24 heterozygotes and 380 wild-type homozygotes were detected and confirmed by bi-directional sequencing. CONCLUSION: PS-TaqMan PCR was successfully developed for CYP2C9 3 detection. This efficient, reliable, high-throughput tool could satisfy the requirements of a clinical laboratory test.
Authors: I V Kutyavin; I A Afonina; A Mills; V V Gorn; E A Lukhtanov; E S Belousov; M J Singer; D K Walburger; S G Lokhov; A A Gall; R Dempcy; M W Reed; R B Meyer; J Hedgpeth Journal: Nucleic Acids Res Date: 2000-01-15 Impact factor: 16.971