{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence from recent studies highlights key tumor‐suppressive mechanisms mediated by regulatory proteins involved in the control of cell proliferation and differentiation. Although FAM86B3P is not directly characterized in these reports, insights from functionally analogous molecules suggest that it may play a comparable role in oncogenesis. In particular, the work on FN1BP1 and FRMD3 provides a conceptual context for how such proteins could modulate tumor growth and cellular homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nOne study identified FN1BP1—a secretory protein expressed in tissues including placenta, liver, and skeletal muscle—that exerts potent growth‐inhibitory effects in hepatocellular carcinoma cells. Overexpression of FN1BP1 led to G1-phase cell cycle arrest, accompanied by up-regulation of cell-cycle inhibitors (such as p21cip1 and p15) and modulation of transcription factors, SWI/SNF complex components, as well as several DNA repair enzymes. These changes culminate in reduced cell proliferation and colony formation, underscoring a tumor suppressor function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn a complementary study, FRMD3 was shown to act as a tumor suppressor in mammary epithelial cells by regulating cellular differentiation. Loss of FRMD3 triggered a luminal-to-basal transition and enhanced stemness, events linked to the development of triple-negative breast cancer. Mechanistically, FRMD3 facilitates the degradation of Disheveled-2, thereby disrupting its interactions with deubiquitinase USP9x and other effectors, which in turn impairs Notch signaling—a pathway critical for maintaining proper epithelial lineage commitment."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Mei Liu, Ronghua Wu, Fuye Yang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification of FN1BP1 as a novel cell cycle regulator through modulating G1 checkpoint in human hepatocarcinoma Hep3B cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0057574"}], "href": "https://doi.org/10.1371/journal.pone.0057574"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23469028"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23469028"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Ji Ma, Yuqing Gong, Xiaoran Sun, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Tumor suppressor FRMD3 controls mammary epithelial cell fate determination via notch signaling pathway."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Sci Adv (2024)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1126/sciadv.adk8958"}], "href": "https://doi.org/10.1126/sciadv.adk8958"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "38959315"}], "href": "https://pubmed.ncbi.nlm.nih.gov/38959315"}]}]}]}