Tacrolimus troughs and genetic determinants of metabolism in kidney transplant recipients: A comparison of four ancestry groups

the DeKAF Genomics and GEN03 Investigators

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Tacrolimus trough and dose requirements vary dramatically between individuals of European and African American ancestry. These differences are less well described in other populations. We conducted an observational, prospective, multicenter study from which 2595 kidney transplant recipients of European, African, Native American, and Asian ancestry were studied for tacrolimus trough, doses, and genetic determinants of metabolism. We studied the well-known variants and conducted a CYP3A4/5 gene-wide analysis to identify new variants. Daily doses, and dose-normalized troughs were significantly different between the four groups (P <.001). CYP3A5*3 (rs776746) was associated with higher dose-normalized tacrolimus troughs in all groups but occurred at different allele frequencies and had differing effect sizes. The CYP3A5*6 (rs10264272) and *7 (rs413003343) variants were only present in African Americans. CYP3A4*22 (rs35599367) was not found in any of the Asian ancestry samples. We identified seven suggestive variants in the CYP3A4/5 genes associated with dose-normalized troughs in Native Americans (P = 1.1 × 10−5-8.8 × 10−6) and one suggestive variant in Asian Americans (P = 5.6 × 10−6). Tacrolimus daily doses and dose-normalized troughs vary significantly among different ancestry groups. We identified potential new variants important in Asians and Native Americans. Studies with larger populations should be conducted to assess the importance of the identified suggestive variants.

Original languageEnglish (US)
Pages (from-to)2795-2804
Number of pages10
JournalAmerican Journal of Transplantation
Issue number10
StatePublished - Oct 1 2019

Bibliographical note

Publisher Copyright:
© 2019 The American Society of Transplantation and the American Society of Transplant Surgeons


  • clinical research/practice
  • genetics
  • immunosuppressant - calcineurin inhibitor: tacrolimus
  • pharmacokinetics/pharmacodynamics
  • pharmacology
  • translational research/science

PubMed: MeSH publication types

  • Journal Article


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