{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPHF19 is a Polycomb‐like protein that plays a critical role in epigenetic gene regulation during development. It acts by binding the active histone mark H3K36me3 via its Tudor domain, thereby recruiting the Polycomb repressive complex 2 (PRC2) along with associated demethylases to active gene loci. This recruitment promotes the deposition of the repressive H3K27me3 modification, facilitating transcriptional silencing that is essential during stem cell differentiation and for maintaining cellular identity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn diverse cancers, aberrant expression or deregulation of PHF19—or its alternatively spliced isoforms—has been closely linked to oncogenic behavior. In hepatocellular carcinoma, glioblastoma, melanoma, pancreatic cancer, prostate cancer, and multiple myeloma, increased PHF19 expression is associated with enhanced cell proliferation, migration, invasion, and drug resistance. Several studies have revealed that dysregulation of PHF19 may arise through microRNA-mediated mechanisms (such as targeting by miR-195-5p, miR-15a, or miR-124a), ultimately altering PRC2 activity and perturbing the expression of cell cycle regulators and tumor suppressors. Moreover, PHF19 aberrations have been implicated in modulating key oncogenic signaling cascades—including beta-catenin and Akt pathways—that are critical for tumor progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "11"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional mechanistic insights underscore the multifaceted role of PHF19 in tumor biology. Its interactions with epigenetic regulators such as EZH2 and the modulation of EZH2 phosphorylation via pathways like PDK1/AKT further potentiate its ability to maintain aberrant gene repression. In some contexts, PHF19 has been shown to impact other signaling pathways such as Hedgehog/Gli1 as well as to function in an isoform-specific manner—for instance, in non-small cell lung cancer—highlighting its diverse contributions to tumor microenvironment remodeling and therapy resistance. Collectively, these findings support the idea that targeting the PHF19-PRC2 regulatory axis may offer new therapeutic avenues for combating cancers characterized by its dysregulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "15"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Gerard L Brien, Guillermo Gambero, David J O'Connell, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Polycomb PHF19 binds H3K36me3 and recruits PRC2 and demethylase NO66 to embryonic stem cell genes during differentiation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Struct Mol Biol (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/nsmb.2449"}], "href": "https://doi.org/10.1038/nsmb.2449"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23160351"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23160351"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Su Qin, Yahong Guo, Chao Xu, et al. 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