Frequencies of CYP3A5*1/*3 variants in a Moroccan population and effect on tacrolimus daily dose requirements in renal transplant patients.

The cytochromes P450 are a superfamily of oxidative enzymes, which are implicated in the metabolism of a large number of endogenous substances as well as exogenous chemicals. The cytochrome P450 (CYP3A5) appears to play an important role in drug metabolism activity. The most frequent mutation in the CYP3A5 gene, affecting its activity, consists of a G6986A transition within intron 3. In this study, we determined the allelic frequency of CYP3A5*3 in a Moroccan population, consisting of 108 individuals including 10 renal transplant patients. About 8.33% (9/108) of the subjects were homozygous wild-type (CYP3A5*1/*1), 37.04% (40/108) were heterozygous (CYP3A5*1/*3), and 54.63% (59/108) were homozygous (CYP3A5*3/*3). Therefore, CYP3A5*3 variant was the most frequent allele detected at 73.15%. In the second part of this work, we assessed the influence of the CYP3A5 polymorphism on tacrolimus doses required for 10 renal transplant patients who are receiving tacrolimus as immunosuppressive therapy. Our results s...