{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n KLLN (also known as “killin”) is a p53‐regulated tumor suppressor gene that plays a multifaceted role in maintaining genomic integrity. It has been shown to directly bind DNA—preferentially single‐stranded regions—to inhibit DNA replication during S‐phase, trigger cell cycle arrest, and induce apoptosis through the regulation of downstream mediators such as TP53 and TP73. In several hereditary cancer predisposition syndromes (e.g., Cowden syndrome and related Cowden‐like disorders), KLLN is frequently silenced by promoter hypermethylation; this epigenetic inactivation is associated with an increased risk of thyroid, breast, renal, and other malignancies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In sporadic tumors such as breast and prostate cancers, reduced or absent nuclear expression of KLLN correlates with aggressive tumor features, including higher grade, increased cell proliferation, invasiveness, and poorer patient outcomes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n KLLN expression is also subject to complex regulation by androgen receptor (AR) signaling and several microRNAs. For instance, alterations in miR‐224, miR‐361‐3p, miR‐744‐3p, and miR‐204 have been shown to target KLLN—thereby modulating downstream cell cycle regulators such as cyclin A and pro‐apoptotic proteins (via TP73 and Puma)—and influencing tumor cell proliferation and apoptosis in cancers of the ovary, prostate, and even in non‐cancerous settings such as spermatogonia and psoriatic keratinocytes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "13"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition to its well‐defined tumor suppressor functions, KLLN contributes to genomic stability by participating in the regulation of heterochromatin; overexpression of KLLN has been associated with increased H3K9 trimethylation through elevated methyltransferase activity, thereby preserving pericentric chromatin organization and reducing chromosomal instability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Overall, these collective findings position KLLN as a critical mediator of cell cycle control and apoptosis. Its dysregulation—whether by genetic alteration, epigenetic silencing, or post‐transcriptional modulation—appears to contribute to the initiation and progression of various cancers, making it a promising prognostic biomarker and a potential therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "17"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Joanne Ngeow, Jessica Mester, Lisa A Rybicki, et al. 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