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Sun, Dan‐Qin; Zheng, Kenneth I.; Xu, Gang; Ma, Hong‐Lei; Zhang, Hao‐Yang; Pan, Xiao‐Yan; Zhu, Pei‐Wu; Wang, Xiao‐Dong; Targher, Giovanni; Byrne, Christopher D.; Chen, Yong‐Ping; Yuan, Wei‐Jie; Zheng, Ming‐Hua
Liver international, January 2020, 2020-01-00, 20200101, Volume: 40, Issue: 1Journal Article
Background & Aims Patatin‐like phospholipase domain‐containing protein 3 (PNPLA3) rs738409 polymorphism is associated with NAFLD severity and the PNPLA3 gene is expressed in the kidneys, but whether PNPLA3 rs738409 polymorphism is also associated with renal tubular injury (RTI) is uncertain. We assessed the effect of PNPLA3 genotypes on biomarkers of RTI and glomerular function in subjects with NAFLD who had either normal (nALT) or abnormal (abnALT) alanine aminotransaminase levels. Methods Two hundred and seventeen patients with histologically proven NAFLD of which 75 had persistently nALT (below upper limit of normal for 3 months) were included. Multivariable regression analyses were undertaken to test associations between PNPLA3 genotype and biomarkers of kidney dysfunction. Results The nALT patient group had higher urinary neutrophil gelatinase‐associated lipocalin levels (u‐NGAL, a biomarker of RTI) (P < .001), higher albuminuria (P = .039) and greater prevalence of chronic kidney disease (CKD; P = .046) than the abnALT group. The association between PNPLA3 GG genotype and risk of CKD and abnormal albuminuria remained significant after adjustment for kidney risk factors and severity of NAFLD histology, mostly in the nALT group. Similarly, PNPLA3 GG genotype was associated with higher u‐NGAL levels in the nALT group, even after adjustment for the aforementioned risk factors and glomerular filtration‐based markers (β‐coefficient: 22.29, 95% CI: 0.99‐43.60, P = .041). Conclusion Patients with NAFLD and persistently nALT, who carry the PNPLA3 rs738409 G allele, are at higher risk of early glomerular and tubular damage. We suggest PNPLA3 genotyping may help identify patients with NAFLD at higher risk of RTI.
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