Research in Medicine

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Abstract: Background: Autoimmune hepatitis (AIH) is a chronic inflammatory liver disorder of unknown etiology. The search for gene polymorphisms has suggested that Glutathion-s-transferase (GST), enzymes that metabolize carcinogens, drug, and foreign compounds, may play a role in susceptibility to autoimmune liver disease and its severity. The objective of this study was to investigate for a relationship between the glutathion-s-transferase M1, T1 and P1 genotypes and type 1 autoimmune hepatitis. Materials and methods: In a case-control study, we investigated glutathion S-transferase (GST) P1 Ile (105) Val, T1, and M1 polymorphisms in 64 type 1 AIH patients and 100 healthy controls that were selected consecutively. GSTM1 and GSTT1 polymorphisms were analyzed by a Multiplex PCR procedure, whereas GSTP1 polymorphism was analyzed by PCR-RFLP. Results: GSTM1 and GSTT1 null genotypes (deletions) were determined in 33(51.6%) and 15 (23.4%) patients with type 1 AIH, and 56(56%) and 22(22%) controls, respectively. Comparison of patients and controls relative to GSTM1 and GSTT1 genotypes revealed no significant difference between them. Regarding GSTP1 genotypes, 25(39.1%) heterozygotes, 7 (10.9%) homozygotes in the case group and 38(38%) heterozygotes, 14(14%) homozygotes in the control group were observed. The allele frequency of GSTP1 (Val) was 30.4% and 33 % in patients and controls, respectively. There were no significant variation in GSTP1 frequencies between cases and controls. Conclusion: These results suggest that there is no association between GST M1, GSTT1 and GSTP1 gene polymorphisms and type 1 autoimmune hepatitis in Iran.

Keywords: Glutathione S-transferase, GSTM1, GSTT1, GSTP1, Autoimmune hepatitis.

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