Abstract
The CYP2C9 c.449G>A (p.R150H, rs7900194) polymorphism, which confers the CYP2C9*8 allele, is common in persons of African descent and results in reduced clearance of the narrow therapeutic index drugs, warfarin and phenytoin. Because of significant homology in DNA sequence at the 449G>A locus among CYP2C genes, the 449G>A variant cannot be reliably detected via PCR-based genotyping assays that require a short PCR product, such as pyrosequencing. Herein, we propose genotyping for the CYP2C9 c.-1766T>C polymorphism via pyrosequencing as an alternative and accurate means of identifying the CYP2C9*8 allele.
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