{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nProtein tyrosine phosphatase receptor type γ (PTPRG) has emerged as a critical tumor‐suppressor molecule whose loss or silencing—often due to promoter hypermethylation, loss of heterozygosity, and microRNA‐mediated mechanisms—contributes to the development and progression of diverse malignancies. Functional studies in nasopharyngeal carcinoma, cutaneous T‐cell lymphoma, breast cancer, chronic myelogenous leukemia and even gastric and lung cancers have demonstrated that restoration or overexpression of PTPRG can inhibit cell proliferation, reduce anchorage‐independent growth, and induce cell cycle arrest. In addition, by dephosphorylating oncogenic receptor tyrosine kinases (such as FGFR1 and AXL) and modulating downstream pathways including BCR–ABL1 and β‐catenin signaling, PTPRG influences both intrinsic tumor cell growth and responsiveness to targeted therapies. Genetic variants in the PTPRG locus have also been associated with altered risk in neurological conditions, such as Alzheimer’s disease, and with variable therapeutic responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its tumor‐suppressive functions, PTPRG plays important roles in cell–cell recognition and adhesion. Structural studies have shown that its extracellular, carbonic anhydrase–like domain interacts with members of the contactin family to mediate neural recognition and assemble complex neural networks. In hematopoietic and immune contexts, PTPRG modulates integrin affinity and function—contributing to the regulation of leukocyte adhesion and migration—and its soluble extracellular isoforms are being evaluated as potential diagnostic biomarkers in ocular pathologies such as Fuchs’ endothelial dystrophy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence continues to shed light on the broader regulatory and structural aspects of PTPRG. High‐resolution crystallography has detailed key domains involved in ligand recognition and catalytic activity, while innovative immunological tools now permit sensitive detection of its expression in clinical samples. Moreover, recent studies indicate that PTPRG contributes to vascular homeostasis by acting as an HCO₃⁻ sensor in endothelial cells—thereby modulating intracellular Ca²⁺ responses, vasorelaxation, and cerebral perfusion during acid–base disturbances. Finally, noncoding RNAs (including long noncoding and circular RNAs) have been implicated in the fine‐tuning of PTPRG expression, and PTPRG-mediated dephosphorylation of targets such as EGFR plays a pivotal role in suppressing promigratory oncogenic signals."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "35"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Suling Liu, Samuel K Kulp, Yasuro Sugimoto, et al. 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