{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPNPLA3 – also known as adiponutrin – has emerged as a pivotal genetic determinant in liver disease. Multiple well‐powered genome‐wide association studies and meta‐analyses have consistently shown that common sequence variants (most notably the I148M missense mutation, rs738409) are strongly associated with increased hepatic fat accumulation and with more advanced features of liver injury including steatohepatitis, fibrosis, cirrhosis, and even hepatocellular carcinoma in diverse populations (differences observed in nonalcoholic fatty liver disease, alcoholic liver disease, and chronic hepatitis C). These clinical genetic studies indicate that PNPLA3 variants serve as a major modifier of hepatic lipid turnover and disease progression, with risk‐prediction models and genetic scores now leveraging this variant to anticipate liver damage and adverse outcomes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nOn the biochemical level, PNPLA3 has been shown to function as an intracellular triglyceride hydrolase and acylglycerol transacylase. In vitro studies using recombinant protein purified from heterologous systems have demonstrated that the wild‐type enzyme hydrolyzes emulsified triglyceride effectively, whereas the I148M substitution impairs substrate access to the catalytic serine and essentially abolishes its lipase activity. These functional investigations support a model in which loss of PNPLA3 enzymatic activity undermines triglyceride mobilization from lipid droplets, thereby promoting hepatic fat accumulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "33", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond hepatocytes, emerging evidence indicates that PNPLA3 also plays a role in hepatic stellate cells and in the regulation of retinoid metabolism. In primary human stellate cells, PNPLA3 is highly expressed and appears to facilitate the hydrolysis of retinyl esters – a function that is compromised in the I148M variant – thereby influencing retinol release and contributing to fibrogenesis. Moreover, studies of PNPLA3 expression in both human and mouse hepatocytes have highlighted its complex regulation by nutritional and hormonal signals, underscoring its potential as a target for therapeutic intervention in liver disease."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "40", "end_ref": "43"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Stefano Romeo, Julia Kozlitina, Chao Xing, et al. 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