Background and purpose: The main purpose of this study was determination of different genotypes and phenotypes of N-acetyltransferase 2 gene and its relationship with drug-induced liver injury among patients in Mazandaran province, Iran, which was done for the first time.
Materials and methods: A total of 65 newly diagnosed unrelated pulmonary tuberculosis patients (47 men, 18 women) was enrolled in the study. A combination of polymerase chain reaction -restriction fragment length polymorphism method was used to investigate different allels of N-acetyltransferase-2. The patients were followed for occurrence of antituberculosis induced hepatotoxicity during the course of treatment. Relationship between N-acetyltransferase-2 phenotypes and antituberculosis induced hepatotoxicity was evaluated.
Results: Frequency of slow, intermediate and fast acetylator genotypes in patients were 34%, 60% and 6%, respectively. Hepatotoxicity was diagnosed in 13.64% of slow acetylators, in 2.56% of intermediate acetylators and interestingly in none of the fast acetylators. The Chi-Square Test showed no significant difference between different acetylation phenotypes and risk of hepatotoxicity (P = 0.1086).
Conclusion: These results could improve treatment profile, prevent from drug-related adverse effects such as hepatotoxicty and lead to better outcomes in tuberculosis patients.
 

Keywords: tuberculosis, liver injury, anti-tuberculosis drugs, NAT2, polymorphism

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