{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nGenetic studies have implicated PARVB in metabolic liver disease. Genome‐wide association studies in Japanese cohorts have identified multiple single‐nucleotide polymorphisms in PARVB that are not only associated with the development of nonalcoholic fatty liver disease (NAFLD) but also correlate with key clinical parameters—such as decreased serum triglycerides, elevated liver enzymes, steatosis grade, and fibrosis stage—indicating that genetic variation in PARVB may contribute to disease onset and progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the cancer setting PARVB appears to function as a tumor suppressor and its loss or downregulation is associated with enhanced oncogenic signaling. Studies in breast, colorectal, ovarian, and urothelial carcinomas indicate that reduced PARVB expression correlates with aberrant integrin‐linked kinase (ILK) activity, diminished cell adhesion, increased invasive behavior, and altered nuclear receptor (PPARγ) signaling, thereby promoting tumor progression and metastasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the cellular level, PARVB (the product of the PARVB gene, also known as beta‐parvin or affixin) plays a critical role in focal adhesion assembly and cytoskeletal reorganization. It acts as an adaptor protein that bridges integrin‐linked kinase with other cytoskeletal regulators by binding directly to paxillin (through its C‐terminal calponin homology domain), alpha‐actinin, and various guanine nucleotide exchange factors, and is regulated by interactions with its homolog alpha‐parvin. This molecular network modulates Rac1/Cdc42 activation, promotes lamellipodium formation, and ensures proper anchorage, thereby influencing cell morphology, migration, and survival."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of host–pathogen interactions, PARVB is targeted by bacterial effector proteins to manipulate the host cell’s adhesion machinery. For example, the environmental pathogen Legionella pneumophila translocates the F‐box protein AnkB, which interacts with host PARVB localized in focal adhesions and lamellipodia. This interaction interferes with the normal ubiquitination of PARVB, suggesting that modulation of its post‐translational modification may alter focal adhesion dynamics in favor of bacterial survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies in skeletal muscle highlight a role for PARVB in membrane repair. PARVB interacts with dysferlin at the sarcolemma, and this partnership appears to be essential for effective calcium‐dependent membrane resealing after injury, thereby linking integrin‐mediated adhesion to the maintenance of membrane integrity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Takuya Kitamoto, Aya Kitamoto, Masato Yoneda, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Genome-wide scan revealed that polymorphisms in the PNPLA3, SAMM50, and PARVB genes are associated with development and progression of nonalcoholic fatty liver disease in Japan."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Genet (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1007/s00439-013-1294-3"}], "href": "https://doi.org/10.1007/s00439-013-1294-3"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23535911"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23535911"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Takuya Kitamoto, Aya Kitamoto, Masato Yoneda, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Targeted next-generation sequencing and fine linkage disequilibrium mapping reveals association of PNPLA3 and PARVB with the severity of nonalcoholic fatty liver disease."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Hum Genet (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/jhg.2014.17"}], "href": "https://doi.org/10.1038/jhg.2014.17"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24621583"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24621583"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Gang Wu, Kai Wang, Yingming Xue, et al. 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