Validation of PNPLA3 polymorphisms as risk factor for NAFLD and liver fibrosis in an admixed population
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Citações na Scopus
40
Tipo de produção
article
Data de publicação
2019
Título da Revista
ISSN da Revista
Título do Volume
Editora
ELSEVIER ESPANA
Citação
ANNALS OF HEPATOLOGY, v.18, n.3, p.466-471, 2019
Resumo
Introduction and aim: Studies have shown that two polymorphisms were associated with steatosis and progression of non-alcoholic fatty liver disease (NAFLD) in different populations: the Patatin-like Phospholipase Domain Containing 3 (PNPLA3) and Transmembrane 6 Superfamily Member 2 (TM6SF2). However, the frequency and significance of these polymorphisms in an admixed population, i.e., Brazilian, is unknown. Therefore, we aimed to evaluate them in healthy subjects in comparison to patients with NAFLD. Material and methods: This was a multicenter cross-sectional study in 248 patients with biopsy-proven NAFLD and in 134 healthy controls from two tertiary centers in Brazil. PNPLA3 (rs738409 c.444C>G) and TM6SF2 (rs58542926 c.449C>T) polymorphisms were evaluated. Results: In controls, the frequencies of PNPLA3 CC and CG + GG were 49.25% and 50.74%, respectively; in NAFLD patients, this was 31.05% and 68.88% (p = 0.0044, 95% CI 1.037-2.977). PNPLA3 GG subjects had an increased risk (3.29-fold) of having NAFLD when compared to CC subjects (p = 0.0044,95% CI 1.504-7.225). In patients with nonalcoholic steatohepatitis (NASH), PNPLA3 GG compared to CC was associated with higher AST levels [38.4 +/- 25.3 versus 36.7 +/- 40.1 IU/L, p= 0.0395)] and with the presence of liver fibrosis (>= F2 fibrosis, p = 0.0272). TM6SF2 polymorphisms were not in Hardy-Weinberg equilibrium in our NAFLD group precluding further analysis. Conclusion: We demonstrated for the first time that PNPLA3 CG + GG increase the risk of NAFLD among Brazilian subjects. Moreover, PNPLA3 GG was associated with liver enzyme elevation and fibrosis in NASH patients. (C) 2019 Fundacion Clinica Medica Sur, A.C.
Palavras-chave
Non-alcoholic fatty liver disease, Single nucleotide polymorphism, Patatin-like Phospholipase Domain Containing 3, Transmembrane 6 Superfamily Member 2, Nonalcoholic steatohepatitis
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