{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRAP1GAP is an essential GTPase‐activating protein that inactivates Rap1 by enhancing its intrinsic GTP hydrolysis. Detailed biochemical studies have uncovered key features of its catalytic mechanism—including the requirement for a unique asparagine “thumb” – and demonstrated that RAP1GAP activity is tightly controlled by post‐translational modifications. For example, phosphorylation by kinases such as glycogen synthase kinase 3β and PLK1 triggers RAP1GAP ubiquitination and subsequent proteasomal degradation, thereby dynamically modulating Rap1 signaling. Moreover, extracellular cues (for instance, thyroid‐stimulating hormone withdrawal or conditions mimicking microgravity) have been shown to alter the expression and turnover of RAP1GAP in diverse cell types, impacting cell junction stability and barrier function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn multiple human cancers, RAP1GAP functions as a potent tumor suppressor whose down‐regulation is a recurring event in disease progression. Reduced RAP1GAP levels—often resulting from promoter hypermethylation or polycomb‐mediated repression—have been reported in pancreatic, thyroid (including papillary and medullary subtypes), melanoma, head and neck squamous cell, colon, renal, endometrioid, and breast cancers. Loss of RAP1GAP is frequently associated with enhanced Rap1 activity that drives increased proliferation, survival, and cell motility. In some head and neck and colon carcinomas, diminished RAP1GAP expression even correlates with alterations in integrin signaling and matrix metalloproteinase up‐regulation, thus promoting invasion and metastasis. Furthermore, in hematological malignancies such as myelodysplastic syndrome and acute myeloid leukemia, modulation of RAP1GAP levels appears to influence differentiation, apoptosis, and invasive behavior."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "29"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its role in oncogenesis, RAP1GAP also contributes to the regulation of normal cellular functions. In podocytes, for instance, elevated RAP1GAP levels compromise Rap1‐mediated activation of β1 integrin, thereby contributing to cell detachment and glomerulosclerosis. Similarly, in renal epithelial cells challenged by calcium oxalate crystals, microRNAs (such as miR‐184) may modulate RAP1GAP expression to influence cell damage. These findings underscore the broader importance of RAP1GAP in translating extracellular and mechanical signals into changes in cell adhesion, migration, and differentiation across both physiological and pathological contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "30", "end_ref": "32"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Oxana M Tsygankova, Elena Feshchenko, Peter S Klein, et al. 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