Significance of the minor cytochrome P450 3A isoforms.

Abstract excerpt

Cytochrome P450 (CYP) 3A4 is responsible for most CYP3A-mediated drug metabolism but the minor isoforms CYP3A5, CYP3A7 and CYP3A43 also contribute. CYP3A5 is the best studied of the minor CYP3A isoforms. It is well established that only approximately 20% of livers express CYP3A5. The most common reason for the absence of expression is a splice site mutation. The frequency of variant alleles shows interethnic...

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