Genetic determinants of the pharmacokinetic variability of rifampin in Malawian adults with pulmonary tuberculosis

Derek J. Sloan*, Andrew D. McCallum, Alessandro Schipani, Deirdre Egan, Henry C. Mwandumba, Steve A. Ward, David Waterhouse, Gertrude Banda, Theresa J. Allain, Andrew Owen, Saye H. Khoo, Geraint R. Davies

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Variable exposure to antituberculosis (TB) drugs, partially driven by genetic factors, may be associated with poor clinical outcomes. Previous studies have suggested an influence of the SLCO1B1 locus on the plasma area under the concentration-time curve (AUC) of rifampin. We evaluated the contribution of single nucleotide polymorphisms (SNPs) in SLCO1B1 and other candidate genes (AADAC and CES-1) to interindividual pharmacokinetic variability in Malawi. A total of 174 adults with pulmonary TB underwent sampling of plasma rifampin concentrations at 2 and 6 h postdose. Data from a prior cohort of 47 intensively sampled, similar patients from the same setting were available to support population pharmacokinetic model development in NONMEM v7.2, using a two-stage strategy to improve information during the absorption phase. In contrast to recent studies in South Africa and Uganda, SNPs in SLCO1B1 did not explain variability in AUC0-∞ of rifampin. No pharmacokinetic associations were identified with AADAC or CES-1 SNPs, which were rare in the Malawian population. Pharmacogenetic determinants of rifampin exposure may vary between African populations. SLCO1B1 and other novel candidate genes, as well as nongenetic sources of interindividual variability, should be further explored in geographically diverse, adequately powered cohorts.

Original languageEnglish
Article numbere00210-17
Number of pages9
JournalAntimicrobial Agents and Chemotherapy
Issue number7
Early online date27 Jun 2017
Publication statusPublished - Jul 2017


  • CES-1
  • Pharmacokinetics
  • Single nucleotide polymorphism
  • SLCO1B1
  • Tuberculosis


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