Background: Tacrolimus (Tac) is mainly metabolized by cytochrome P450 3A isoenzymes. In a cohort of heart transplant recipients, we investigated the effect of CYP3A5, CYP3A4, and ABCB1/MDR1 polymorphisms on Tac dose requirements and the risk of developing new-onset diabetes after transplantation (NODAT). Methods: A total of 65 heart transplant recipients were genotyped for 3 single nucleotide polymorphisms (SNPs) in the CYP3A5 (SNP rs776746), CYP3A4 (SNP rs2740574), and ABCB1 (SNP rs104564). The mean Tac dose values were compared between the genotypes. Results: CYP3A5*3 homozygotes (nonexpressers; n = 55, 85%) received significantly higher Tac dose compared with CYP3A5*1 carriers (expressers). No different NODAT frequencies were found between the genotypes. Conclusions: The CYP3A5 polymorphism was the main determinant of Tac dose requirements among heart transplant recipients. This common functional polymorphism had no influence on the risk of developing NODAT. © 2012 Elsevier Inc.
CITATION STYLE
Díaz-Molina, B., Tavira, B., Lambert, J. L., Bernardo, M. J., Álvarez, V., & Coto, E. (2012). Effect of CYP3A5, CYP3A4, and ABCB1 genotypes as determinants of tacrolimus dose and clinical outcomes after heart transplantation. In Transplantation Proceedings (Vol. 44, pp. 2635–2638). https://doi.org/10.1016/j.transproceed.2012.09.062
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