{"gene":"RASD1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2000,"finding":"Dexras1 physically interacts with the nNOS adaptor protein CAPON, forming a ternary complex with nNOS and CAPON that enhances nNOS-mediated activation of Dexras1; Dexras1 is activated by NO donors and by NMDA receptor-stimulated NO synthesis in cortical neurons, establishing it as a physiologic NO effector downstream of nNOS.","method":"Co-immunoprecipitation (ternary complex), GTPase activation assays with NO donors and NMDA stimulation in cortical neurons, genetic validation using nNOS-/- mice showing selective reduction of Dexras1 activation","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, functional GTPase assay, in vivo genetic epistasis (nNOS-/- mice), multiple orthogonal methods in one study, independently confirmed by subsequent studies","pmids":["11086993"],"is_preprint":false},{"year":2002,"finding":"S-nitrosylation of Dexras1 occurs exclusively on Cys11; mutagenesis of Cys11 abolished NO donor-mediated activation of Dexras1, identifying this single residue as the site of NO-mediated guanine nucleotide exchange activation.","method":"Nitrosopeptide mapping (2D peptide chromatography of radiolabeled S-nitrosylated cysteines), site-directed mutagenesis of Cys11","journal":"Chemistry & biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — novel in vitro biochemical mapping method plus mutagenesis validation, single lab but two orthogonal methods with rigorous controls","pmids":["12498886"],"is_preprint":false},{"year":2006,"finding":"Dexras1 binds to PAP7 (peripheral benzodiazepine receptor-associated protein), which in turn binds DMT1 (divalent metal transporter 1), establishing a signaling cascade: NMDA receptor activation → nNOS → S-nitrosylation/activation of Dexras1 → PAP7 → DMT1 → iron uptake in neurons.","method":"Co-immunoprecipitation of Dexras1-PAP7 and PAP7-DMT1; functional iron uptake assays in cortical neurons; iron chelation rescue of NMDA neurotoxicity","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP defining the complex, functional iron uptake assays, pharmacological rescue, multiple orthogonal methods, independently replicated in later studies","pmids":["16908409"],"is_preprint":false},{"year":2004,"finding":"Dexras1 couples NMDA receptor and light input to Gi/o and ERK activation in the suprachiasmatic nucleus (SCN); genetic deletion of Dexras1 eliminates a pertussis-sensitive circadian response to NMDA and reduces photic entrainment, while greatly potentiating nonphotic responses to neuropeptide Y and arousal.","method":"Gene-targeted dexras1-/- mice; circadian behavioral assays; pharmacological pertussis toxin treatment; ERK/MAPK activation assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined behavioral and molecular phenotypes, pertussis toxin epistasis, replicated and extended by multiple subsequent studies","pmids":["15339652"],"is_preprint":false},{"year":2001,"finding":"Dexras1 inhibits signal transduction from the Gi-coupled formyl peptide receptor (FPR) to ERK1/2; while Dexras1 alone weakly activates ERK2, it attenuates ligand-stimulated FPR-to-ERK signaling and impairs pertussis toxin-catalyzed ADP-ribosylation of membrane Gi-alpha, suggesting it acts very proximally at receptor-Gi coupling.","method":"Co-transfection of Dexras1 and FPR in COS-7 and HEK293 cells; immune complex in vitro kinase assay for HA-Erk-2; GTPγS binding assay; ADP-ribosylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus multiple biochemical readouts (GTPγS binding, ADP-ribosylation) in two cell lines, single lab with multiple orthogonal methods","pmids":["11751935"],"is_preprint":false},{"year":2001,"finding":"Constitutively active Dexras1 (A178V mutant) inhibits cAMP-stimulated peptide hormone secretion in AtT-20 corticotroph cells; this inhibition requires prenylation, as deletion of the CAAX box (C277term) abolishes the effect. Wild-type Dexras1 had no effect on cAMP-stimulated secretion.","method":"Transient co-transfection with human GH secretion reporter; 8-Br-cAMP stimulation assay; GTP-binding assay of wild-type and mutant Dexras1; CAAX deletion mutagenesis","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — functional secretion assay with constitutively active and dominant-negative mutants plus CAAX mutagenesis establishing prenylation dependence, single lab with multiple orthogonal methods","pmids":["11356714"],"is_preprint":false},{"year":2004,"finding":"Dexras1 inhibits adenylyl cyclase activity in a pertussis toxin-sensitive and RGS4-sensitive manner, but independently of dominant-interfering Gi-alpha2 mutants, indicating it activates both Gi-alpha- and Gβγ-dependent arms of Gi signaling. Dexras1 also decreases forskolin-stimulated CREB activation.","method":"cAMP measurement assays in cells co-expressing constitutively active Gsα(Q227L) and Dexras1; pertussis toxin treatment; RGS4 co-expression; dominant-interfering Gi mutants; CREB-luciferase reporter","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cAMP and CREB reporter assays with pharmacological and genetic dissection of pathway, single lab","pmids":["15020218"],"is_preprint":false},{"year":2005,"finding":"Dexras1 blocks Gβγ-dependent heterologous sensitization of adenylyl cyclase 1 (AC1) induced by persistent D2L receptor activation; this block requires nucleotide binding, as the Dexras1-G31V mutant is without effect. Dexras1 also reduces D2L receptor-mediated ERK1/2 activation by ~50% but does not alter acute D2L receptor inhibition of AC1.","method":"cAMP assay in HEK293 cells; ERK1/2 phosphorylation assay; betaARK-ct Gβγ scavenger experiment; Dexras1-G31V nucleotide-binding mutant","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional AC and ERK assays with nucleotide-binding mutant epistasis and Gβγ scavenger, single lab","pmids":["15913563"],"is_preprint":false},{"year":2003,"finding":"A glucocorticoid response element (GRE) in the 3'-flanking region (~2.3 kb downstream of the poly(A) signal) of the human Dexras1 gene is required for rapid glucocorticoid-induced transcription; a point mutation in the 15-bp GRE abolishes glucocorticoid responsiveness.","method":"Luciferase reporter assay with GRE-containing 3'-flanking region; site-directed point mutagenesis of GRE","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with mutagenesis defining the regulatory element, single lab","pmids":["12818426"],"is_preprint":false},{"year":2008,"finding":"Dexras1 binds to the PTB2 domain of the adaptor protein FE65 and potently suppresses FE65-APP intracellular domain-mediated transcription (including GSK3β); Dexras1 and APP can simultaneously bind FE65 PTB2. Phosphorylation of FE65 Tyr547 reduces Dexras1-FE65 binding. siRNA knockdown of Dexras1 enhances GSK3β expression and increases Tau phosphorylation.","method":"Co-immunoprecipitation; GST pulldown; luciferase transcription reporter; siRNA knockdown; Western blot for Tau phosphorylation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and pulldown plus functional reporter and knockdown phenotype, single lab","pmids":["18922798"],"is_preprint":false},{"year":2013,"finding":"Dexras1 is required for NO-mediated (but not H2O2- or staurosporine-mediated) iron influx and neuronal death; deletion of Dexras1 in mice attenuates NO-mediated cell death in primary cortical neurons and protects retinal ganglion cells in vivo from NMDA excitotoxicity.","method":"Dexras1 knockout mice; primary cortical neuron cultures; retinal ganglion cell survival assays in vivo; iron chelation experiments; cell death assays with multiple apoptotic stimuli","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with both in vitro and in vivo phenotypic readouts, stimulus specificity demonstrated, replicated across cell types","pmids":["23426685"],"is_preprint":false},{"year":2013,"finding":"Dexras1 is required for adipogenesis; depletion of Dexras1 abolishes adipogenic differentiation of 3T3-L1 cells, overexpression elicits adipogenesis, and Dexras1-deleted mice show reduced adiposity and diminished diet-induced weight gain.","method":"Dexras1 knockdown and overexpression in 3T3-L1 cells; mouse embryonic fibroblasts from Dexras1-/- mice; in vivo diet-induced obesity model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss- and gain-of-function in vitro plus in vivo KO validation, multiple orthogonal cell and animal models","pmids":["24297897"],"is_preprint":false},{"year":2016,"finding":"Dexras1 mediates adipogenesis downstream of glucocorticoids by linking to IGF-1 signaling: upon insulin/IGF-1 treatment, Dexras1 translocates to the plasma membrane via its unique C-terminal domain (aa 223–276), activates MAPK through interaction with Shc and Raf, and drives CCAAT/enhancer binding protein β (C/EBPβ) phosphorylation and mitotic clonal expansion.","method":"Dexras1 C-terminal deletion mutants; plasma membrane fractionation/subcellular localization; Co-IP of Dexras1 with Shc and Raf; MAPK phosphorylation assays; C/EBPβ phosphorylation assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular localization with domain mutants plus Co-IP and downstream signaling assays, single lab","pmids":["27345868"],"is_preprint":false},{"year":2015,"finding":"PKA phosphorylates Dexras1 on Ser253, which suppresses iron influx by reducing S-nitrosylation of Dexras1 in a dose-dependent manner; adiponectin modulates Dexras1 iron trafficking via PKA. This establishes a functional crosstalk between S-nitrosylation and phosphorylation on Dexras1.","method":"In vitro PKA phosphorylation assay; site-directed mutagenesis (Ser253); S-nitrosylation detection assay; iron influx assay; adiponectin treatment","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay with site-directed mutagenesis and S-nitrosylation readout, single lab","pmids":["26358293"],"is_preprint":false},{"year":2011,"finding":"Dexras1 (AGS1) decreases cAMP accumulation downstream of dopamine D1 receptor signaling independently of pertussis toxin (suggesting interaction with a Gα-i monomer rather than the heterotrimeric Gi complex), and both AGS1/Dexras1 and Rhes associate with GTP-bound Gα-i in pull-down assays. Neither protein interacted with the D1 receptor directly.","method":"cAMP accumulation assay in transfected cells; pertussis toxin treatment; GTP-Gα-i pull-down assay","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional cAMP assay plus pull-down with GTP-Gαi, single lab, two methods","pmids":["21374700"],"is_preprint":false},{"year":2011,"finding":"Rasd1 interacts with Ear2 (Nr2f6), a nuclear receptor/negative regulator of renin transcription, via the ligand binding domain of Ear2; this interaction inhibits Ear2-mediated transcriptional repression and upregulates endogenous renin transcription. Missense mutations in Rasd1 that attenuate Ear2 binding also abolish the functional effect. GTP-hydrolysis activity of Rasd1 is required.","method":"Yeast two-hybrid screen; in vitro pulldown; Co-IP in COS-7 cells and from mouse brain/HEK293T lysates; renin promoter-luciferase reporter; real-time RT-PCR; shRNA knockdown; domain mapping with Ear2 deletion mutants","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP from endogenous tissue plus functional reporter with multiple mutants, single lab","pmids":["21247419"],"is_preprint":false},{"year":2011,"finding":"Rasd1 interacts with NonO (p54nrb) via affinity pulldown and Co-IP; the GTP-hydrolysis activity of Rasd1 is required for functional interaction. Rasd1 modulates NonO coactivator function at CRE-site-containing target genes in the cAMP pathway, as shown by reporter gene assays and chromatin immunoprecipitation.","method":"Affinity pulldown; co-immunoprecipitation; indirect immunofluorescence; luciferase reporter gene assays; chromatin immunoprecipitation; gene knockdown","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal binding assays (pulldown, Co-IP, ChIP) plus functional reporter, single lab","pmids":["21915321"],"is_preprint":false},{"year":2006,"finding":"Dexras1 limits the capacity of PACAP/PAC1 to affect ERK/MAPK in the SCN during the late night, and modulates light-induced ERK/MAPK in a time-of-day-specific manner; daytime photic phase advances are mediated by a pathway that stimulates ERK/MAPK in the SCN shell and triggers downregulation of clock protein expression, all dependent on Dexras1.","method":"dexras1-/- mice; circadian behavioral phase response curve analysis; ERK/MAPK phosphorylation assays; clock protein immunohistochemistry in SCN","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple molecular and behavioral readouts in vivo, extensive mechanistic follow-up, replicated findings","pmids":["17167088"],"is_preprint":false},{"year":2012,"finding":"Glucocorticoid receptor (GR) and STAT5b cooperatively drive glucocorticoid-induced Rasd1 expression in pancreatic islets; prolactin inhibits this GR/STAT5b transcriptional activity on the Rasd1 gene. Rasd1 knockdown abolishes the inhibitory effects of dexamethasone on insulin secretion and on PKA, PKC, and ERK1/2 pathways in β-cells.","method":"Chromatin immunoprecipitation (GR and STAT5b on Rasd1 promoter); siRNA knockdown of Rasd1; insulin secretion assay; Western blot of PKA, PKC, ERK1/2 phosphorylation; immunofluorescence localization in β-cells","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP defining transcriptional mechanism plus functional knockdown with defined signaling readouts, single lab","pmids":["22700767"],"is_preprint":false},{"year":2014,"finding":"Dexras1 activates TRPC4 channels when co-expressed; among Ras family members tested, Rasd1 is uniquely capable of activating TRPC4, and this requires functional Gαi1 and Gαi3. Dexamethasone increases Rasd1 protein expression in INS-1 cells and thereby triggers TRPC4-like cationic current.","method":"Electrophysiology (patch-clamp) of TRPC4 currents in cells co-expressing Rasd1 and other Ras family members; Gαi1/Gαi3 co-expression experiments; dexamethasone treatment of INS-1 cells with current recording","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — electrophysiology with Ras family selectivity panel and Gαi epistasis, single lab","pmids":["25502319"],"is_preprint":false},{"year":2016,"finding":"Genetic and pharmacological ablation of the Dexras1-mediated neuronal iron pathway increases glutamatergic transmission; lysosomal iron is identified as the main source for iron signaling that modulates NMDA receptor activity via the PKC/Src/NR2A pathway, establishing Dexras1 as a modulator of synaptic excitability.","method":"Dexras1-/- mice; voltage-sensitive dye imaging of hippocampal slices; whole-cell patch-clamp of synaptic NMDA currents; pharmacological iron chelation; Western blot for NR2A and PKC/Src pathway components","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with electrophysiology plus pharmacological validation in hippocampal slice, single lab","pmids":["27080392"],"is_preprint":false},{"year":2016,"finding":"Rasd1 inhibits cAMP-induced gene expression (c-Fos, Nr4a1, pCREB) in AtT20 cells and in rat supraoptic nucleus neurons; these effects are dependent on isoprenylation, as farnesyltransferase inhibitor FTI-277 and CAAX box deletion prevent inhibition. In vivo lentiviral Rasd1 overexpression in rat SON diminishes cAMP-inducible genes under osmotic stress.","method":"Rasd1 overexpression and shRNA knockdown in AtT20 cells; dexamethasone treatment; FTI-277 treatment; CAAX deletion mutant; lentiviral injection into rat supraoptic nucleus; Western blot and immunofluorescence for CREB phosphorylation and target genes","journal":"Molecular brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with domain-mutant mechanistic dissection, single lab","pmids":["26739966"],"is_preprint":false},{"year":2016,"finding":"RASD1 knockdown in mouse GV oocytes arrests meiotic maturation at metaphase I, causing disrupted spindle formation and chromosomal misalignment; the MI-to-MII transition factors Obox4 and Arp2/3 are misregulated by Rasd1 knockdown, revealing a role for RASD1 in cytokinesis progression and spindle formation during oocyte maturation.","method":"RNAi microinjection into mouse GV oocytes; time-lapse video microscopy; immunofluorescence for spindle and chromosomes; qRT-PCR for Obox4 and Arp2/3","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNAi loss-of-function in oocytes with live imaging and molecular readouts, single lab","pmids":["27997888"],"is_preprint":false},{"year":2018,"finding":"Dexras1 is required for exercise-triggered recruitment of quiescent neural progenitors into the cell cycle in the hippocampal neurogenic niche; dexras1-/- mice show abolished exercise-dependent ERK/MAPK and CREB activation, impaired NR2A upregulation, and reduced bdnf/trkB/vegf-a induction in the dentate gyrus. NMDA receptor pharmacological inhibition enhances SGZ proliferation in wild-type but not dexras1-/- mice, placing Dexras1 downstream of NMDA receptors in this pathway.","method":"dexras1-/- mice; exercise paradigm; BrdU incorporation/cell survival assays; Western blot for ERK/MAPK, CREB; RT-PCR for NR2A, bdnf, trkB, vegf-a; NMDA receptor antagonist pharmacology","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple molecular and cellular readouts in vivo plus pharmacological epistasis, single lab","pmids":["29593295"],"is_preprint":false},{"year":2019,"finding":"Dexras1 deletion attenuates oxidative stress-induced neurodegeneration in experimental optic neuritis (EAE model); Dexras1 is activated by S-nitrosylation by both iNOS (in activated microglia/macrophages) and nNOS (in neurons), and iron entry triggered by NO-activated Dexras1 contributes to retinal ganglion cell and axonal loss during optic neuritis.","method":"Dexras1-/- mice in EAE model; visual function assessment; retinal ganglion cell and axon counting; iron chelator (deferiprone) treatment","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO plus pharmacological rescue with defined neuroprotective readout in vivo, single lab","pmids":["31406150"],"is_preprint":false},{"year":2025,"finding":"S-nitrosylation of Dexras1 (SNO-Dexras1) is elevated in peri-infarct cortex after stroke; AAV-mediated knockdown of Dexras1 or overexpression of dominant-negative Dexras1-C11S (non-nitrosylatable) promotes motor recovery, increases neuronal excitability (spike number and mEPSC frequency), and enhances dendritic spine density in peri-infarct cortex. Conversely, Dexras1 overexpression worsens stroke outcome.","method":"Photothrombotic stroke model in mice; AAV microinjection (Dexras1 KD, Dexras1-C11S overexpression, Dexras1 overexpression); grid-walking and cylinder behavioral tasks; Western blot for SNO-Dexras1; electrophysiology (spike recording, mEPSC); Golgi staining for dendritic spines","journal":"CNS neuroscience & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain/loss-of-function with dominant-negative mutant, electrophysiology and morphological readouts, single lab","pmids":["39749632"],"is_preprint":false},{"year":2022,"finding":"Dexras1 induces oligodendrocyte dysdifferentiation and myelin injury after subarachnoid hemorrhage by inhibiting the cAMP-CREB pathway; Dexras1 overexpression worsens OPC dysdifferentiation while knockdown ameliorates myelin injury and glial activation after SAH.","method":"Intracerebroventricular lentiviral Dexras1 overexpression/knockdown in SAH rat model; immunofluorescence; transmission electron microscopy; Western blot for cAMP-CREB pathway components; primary neuron treatment with oxyhemoglobin","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain/loss-of-function with cellular and molecular readouts, single lab","pmids":["36230939"],"is_preprint":false},{"year":2024,"finding":"KIAA1429 increases the m6A modification level of RASD1 mRNA and enhances its degradation in an m6A-YTHDF2-dependent manner, thereby downregulating RASD1 expression in gastric cancer cells.","method":"MeRIP-seq; MeRIP-qPCR; RNA stability assay; RNA immunoprecipitation (RIP); RNA pull-down; dual luciferase reporter; Western blot","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RNA biochemistry methods (MeRIP-seq, RIP, RNA stability) establishing m6A-YTHDF2 mechanism on RASD1 mRNA, single lab","pmids":["38902717"],"is_preprint":false},{"year":2024,"finding":"The lncRNA SIX1-1 promotes cervical cancer cell proliferation by recruiting DNMT1 to the RASD1 promoter, causing its methylation and transcriptional silencing; reduced RASD1 expression then activates the cAMP/PKA/CREB signaling pathway to promote proliferation.","method":"SIX1-1 knockdown in vitro and in vivo; nuclear localization by fractionation; Co-IP/binding of SIX1-1 with DNMT1; chromatin immunoprecipitation (DNMT1 on RASD1 promoter); bisulfite sequencing; RASD1 rescue experiments","journal":"Human cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and bisulfite sequencing defining epigenetic mechanism, rescue experiments, single lab","pmids":["39014290"],"is_preprint":false}],"current_model":"RASD1/Dexras1 is a brain-enriched Ras-family small GTPase that is transcriptionally induced by glucocorticoids (via a 3'-GRE) and activated post-translationally by S-nitrosylation on Cys11, a modification mediated by nNOS and greatly enhanced by the nNOS–CAPON–Dexras1 ternary complex; once activated, it couples to the Gi/o–ERK/MAPK cascade in the suprachiasmatic nucleus to modulate photic and nonphotic circadian entrainment, drives neuronal iron uptake by recruiting PAP7 and DMT1 (thereby mediating NMDA-excitotoxic cell death), inhibits adenylyl cyclase/cAMP–PKA–CREB signaling in a prenylation-dependent manner, links glucocorticoid and IGF-1 signals to MAPK-driven adipogenesis through membrane translocation via its C-terminal domain and interaction with Shc/Raf, suppresses FE65–APP-mediated transcription by binding the FE65 PTB2 domain, modulates renin transcription via interaction with Ear2, and activates TRPC4 channels through Gαi; additionally, phosphorylation of Dexras1 on Ser253 by PKA counteracts S-nitrosylation to suppress iron trafficking, and RASD1 mRNA stability is regulated by m6A methylation via the KIAA1429–YTHDF2 axis."},"narrative":{"mechanistic_narrative":"RASD1/Dexras1 is a glucocorticoid-inducible, brain-enriched Ras-family small GTPase that transduces nitric oxide and hormonal signals into control of Gi/o-coupled signaling, neuronal iron handling, and circadian and metabolic physiology [PMID:11086993, PMID:15339652, PMID:24297897]. It is activated post-translationally by S-nitrosylation on Cys11, a modification generated by nNOS and amplified within an nNOS–CAPON–Dexras1 ternary complex downstream of NMDA receptor activation [PMID:11086993, PMID:12498886]. Activated Dexras1 recruits PAP7, which bridges to the divalent metal transporter DMT1 to drive NO-dependent neuronal iron uptake; this iron-influx pathway mediates NMDA excitotoxic and oxidative neuronal death and modulates synaptic NMDA receptor activity, and is opposed by PKA phosphorylation on Ser253, which suppresses S-nitrosylation [PMID:16908409, PMID:23426685, PMID:26358293, PMID:27080392, PMID:31406150]. In the suprachiasmatic nucleus Dexras1 couples NMDA and photic input to Gi/o and ERK/MAPK signaling, shaping photic versus nonphotic circadian entrainment and time-of-day-specific clock responses [PMID:15339652, PMID:17167088]. As a negative regulator of cAMP signaling it acts proximally at receptor–Gi coupling and adenylyl cyclase, inhibiting cAMP/PKA/CREB-driven gene expression and hormone secretion in a prenylation-dependent manner [PMID:11751935, PMID:15020218, PMID:26739966], and it uniquely activates TRPC4 channels through Gαi [PMID:25502319]. Dexras1 also links glucocorticoid and IGF-1 signals to MAPK-driven adipogenesis via C-terminal membrane translocation and interaction with Shc and Raf [PMID:24297897, PMID:27345868], and engages transcriptional regulators including FE65, Ear2/Nr2f6, and NonO to modulate APP, renin, and CRE-dependent gene programs [PMID:18922798, PMID:21247419, PMID:21915321]. RASD1 expression is itself controlled by glucocorticoid receptor/STAT5b transcription and by post-transcriptional and epigenetic silencing in cancer through m6A-YTHDF2-mediated mRNA degradation and DNMT1-dependent promoter methylation [PMID:22700767, PMID:38902717, PMID:39014290].","teleology":[{"year":2000,"claim":"Established Dexras1 as a physiologic effector of nitric oxide by placing it in a signaling complex with nNOS, answering how this GTPase is activated in neurons.","evidence":"Co-IP of an nNOS–CAPON–Dexras1 ternary complex with GTPase activation assays and nNOS-/- mice in cortical neurons","pmids":["11086993"],"confidence":"High","gaps":["Did not define the chemical site of NO modification","Downstream effectors of activated Dexras1 not yet identified"]},{"year":2002,"claim":"Mapped NO activation to a single residue, defining Cys11 S-nitrosylation as the molecular switch for nucleotide exchange.","evidence":"Nitrosopeptide mapping and Cys11 site-directed mutagenesis in vitro","pmids":["12498886"],"confidence":"High","gaps":["Structural basis of how nitrosylation drives exchange not resolved","In vivo contribution of Cys11 to phenotypes addressed only later"]},{"year":2001,"claim":"Defined Dexras1 as a negative regulator of cAMP and Gi-coupled receptor signaling acting at the receptor–Gi interface, with prenylation required for function.","evidence":"Co-transfection with FPR and a cAMP-secretion reporter, GTPγS binding, ADP-ribosylation, and CAAX-deletion mutants in COS-7/HEK293/AtT-20 cells","pmids":["11751935","11356714"],"confidence":"High","gaps":["Mechanism of action at Gi not structurally defined","Endogenous receptor contexts not established"]},{"year":2003,"claim":"Identified an unusual 3'-flanking GRE controlling glucocorticoid-induced Dexras1 transcription, explaining its hormonal inducibility.","evidence":"Luciferase reporter with the 3'-flanking GRE and point mutagenesis","pmids":["12818426"],"confidence":"Medium","gaps":["Reporter-based; endogenous chromatin occupancy shown only in later work","Tissue-specificity of the element not addressed"]},{"year":2004,"claim":"Demonstrated in vivo that Dexras1 couples NMDA and light input to Gi/o-ERK signaling to shape circadian entrainment.","evidence":"dexras1-/- mice with circadian behavioral assays, pertussis toxin epistasis, and ERK activation readouts","pmids":["15339652","15020218"],"confidence":"High","gaps":["Molecular link from Dexras1 to ERK in the SCN not fully reconstituted","Relationship between Gαi and Gβγ arms incompletely defined"]},{"year":2006,"claim":"Resolved how NO-activated Dexras1 drives neuronal iron uptake by identifying the PAP7–DMT1 cascade, connecting the GTPase to excitotoxicity.","evidence":"Reciprocal Co-IP of Dexras1-PAP7 and PAP7-DMT1, iron uptake assays, and iron-chelation rescue of NMDA neurotoxicity","pmids":["16908409","17167088"],"confidence":"High","gaps":["Stoichiometry and structure of the Dexras1–PAP7–DMT1 complex unknown","How activation triggers DMT1 recruitment mechanistically unclear"]},{"year":2008,"claim":"Extended Dexras1 into transcriptional control by showing it binds the FE65 PTB2 domain and suppresses FE65-APP-driven gene expression, including GSK3β and Tau effects.","evidence":"Co-IP, GST pulldown, luciferase reporter, and siRNA knockdown with Tau phosphorylation Western blots","pmids":["18922798"],"confidence":"Medium","gaps":["GTPase-dependence of FE65 binding not dissected","In vivo relevance to APP biology not established"]},{"year":2011,"claim":"Defined nuclear and Gαi-monomer partners of Rasd1 (Ear2, NonO, GTP-Gαi) showing GTP-hydrolysis-dependent regulation of renin and CRE-dependent transcription.","evidence":"Yeast two-hybrid, pulldown, Co-IP from tissue, promoter-luciferase, ChIP, and GTP-Gαi pulldowns with nucleotide mutants","pmids":["21247419","21915321","21374700"],"confidence":"Medium","gaps":["Whether nuclear and membrane functions occur in the same cells unclear","Direct vs indirect transcriptional effects not fully separated"]},{"year":2013,"claim":"Provided genetic proof that Dexras1 is required for NO-specific iron-mediated neuronal death and for adipogenesis, defining distinct physiologic outputs.","evidence":"Dexras1 knockout mice with stimulus-specific neuronal death and retinal protection assays, and 3T3-L1/MEF adipogenesis with in vivo diet-induced obesity","pmids":["23426685","24297897"],"confidence":"High","gaps":["Molecular link between Dexras1 activation and adipogenic transcription not yet defined at this stage","Iron-death pathway downstream of DMT1 not fully traced"]},{"year":2015,"claim":"Revealed PKA phosphorylation of Ser253 as a counter-regulatory switch that suppresses S-nitrosylation and iron influx, establishing PTM crosstalk.","evidence":"In vitro PKA assay, Ser253 mutagenesis, S-nitrosylation detection, and iron influx assays with adiponectin treatment","pmids":["26358293"],"confidence":"Medium","gaps":["Structural basis of phosphorylation–nitrosylation antagonism unknown","In vivo significance of Ser253 not tested"]},{"year":2016,"claim":"Mechanistically connected glucocorticoid/IGF-1 signaling to MAPK-driven adipogenesis through C-terminal membrane translocation and Shc/Raf binding, and identified TRPC4 activation as a Gαi-dependent output.","evidence":"C-terminal deletion mutants, membrane fractionation, Co-IP with Shc/Raf, C/EBPβ assays, and TRPC4 patch-clamp with Gαi epistasis","pmids":["27345868","25502319","26739966","27080392"],"confidence":"Medium","gaps":["Direct GTPase activity state during membrane translocation not defined","Channel-gating mechanism for TRPC4 not resolved"]},{"year":2018,"claim":"Placed Dexras1 downstream of NMDA receptors in activity- and exercise-dependent neural progenitor recruitment and synaptic excitability control.","evidence":"dexras1-/- mice with exercise paradigm, BrdU assays, ERK/CREB and neurotrophin readouts, and NMDA antagonist epistasis; hippocampal slice electrophysiology","pmids":["29593295","27997888"],"confidence":"Medium","gaps":["Cell-autonomous vs niche contributions not separated","Mechanism linking iron signaling to NR2A regulation incompletely defined"]},{"year":2025,"claim":"Demonstrated that SNO-Dexras1 limits recovery after CNS injury, with non-nitrosylatable Dexras1-C11S and knockdown promoting plasticity and recovery in stroke and white-matter injury.","evidence":"Photothrombotic stroke and SAH models with AAV/lentiviral manipulation, behavioral, electrophysiological, and morphological readouts","pmids":["39749632","36230939","31406150"],"confidence":"Medium","gaps":["Therapeutic targeting strategies not validated","Relative contributions of iron vs cAMP arms in injury not dissected"]},{"year":2024,"claim":"Identified post-transcriptional and epigenetic silencing of RASD1 in cancer, linking its loss to cAMP/PKA/CREB-driven proliferation.","evidence":"MeRIP-seq/RIP/RNA-stability assays for KIAA1429–m6A–YTHDF2 in gastric cancer and ChIP/bisulfite sequencing for lncRNA SIX1-1–DNMT1 promoter methylation in cervical cancer","pmids":["38902717","39014290"],"confidence":"Medium","gaps":["Whether RASD1 acts as a tumor suppressor in vivo not established","Direct GTPase signaling output suppressed in tumors not defined"]},{"year":null,"claim":"How the distinct Dexras1 outputs — neuronal iron uptake, cAMP suppression, transcriptional partner regulation, and adipogenic membrane signaling — are coordinated by its activation state and subcellular localization within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of Dexras1 in its active or partner-bound states","Unclear how PTM state dictates choice among competing effectors","Spatial segregation of nuclear vs membrane functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[15,16]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9,15,16]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,6,7,19]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[15,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6,7]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[3,17]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,10,20,23]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[10,24]}],"complexes":["nNOS–CAPON–Dexras1 ternary complex"],"partners":["CAPON","NOS1","PAP7","DMT1","FE65","NR2F6","NONO","SHC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y272","full_name":"Dexamethasone-induced Ras-related protein 1","aliases":["Activator of G-protein signaling 1"],"length_aa":281,"mass_kda":31.6,"function":"Small GTPase. 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Poland)","url":"https://pubmed.ncbi.nlm.nih.gov/34041361","citation_count":6,"is_preprint":false},{"pmid":"17985234","id":"PMC_17985234","title":"Dex-ras1 and serum- and glucocorticoid-inducible protein kinase 1: regulation of expression by dexamethasone in HEK293 cells.","date":"2007","source":"Neurochemical research","url":"https://pubmed.ncbi.nlm.nih.gov/17985234","citation_count":6,"is_preprint":false},{"pmid":"33840368","id":"PMC_33840368","title":"Expression of Rasd1 in mouse endocrine pituitary cells and its response to dexamethasone.","date":"2021","source":"Stress (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/33840368","citation_count":5,"is_preprint":false},{"pmid":"39749632","id":"PMC_39749632","title":"S-Nitrosylation of Dexras1 Controls Post-Stroke Recovery via Regulation of Neuronal Excitability and Dendritic Remodeling.","date":"2025","source":"CNS neuroscience & therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/39749632","citation_count":5,"is_preprint":false},{"pmid":"33982674","id":"PMC_33982674","title":"Sevoflurane protects against ischemia-reperfusion injury in mice after total knee arthroplasty via facilitating RASD1-mediated protein kinase A pathway activation.","date":"2021","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/33982674","citation_count":4,"is_preprint":false},{"pmid":"15339641","id":"PMC_15339641","title":"Resetting the clock: Dexras1 defines a path.","date":"2004","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/15339641","citation_count":4,"is_preprint":false},{"pmid":"39731125","id":"PMC_39731125","title":"Knockdown of RASD1 improves MASLD progression by inhibiting the PI3K/AKT/mTOR pathway.","date":"2024","source":"Lipids in health and disease","url":"https://pubmed.ncbi.nlm.nih.gov/39731125","citation_count":3,"is_preprint":false},{"pmid":"36212606","id":"PMC_36212606","title":"Ketamine alleviating depressive-like behaviors is associated with regulation of nNOS-CAPON-Dexras1 complex in chronic unpredictable mild stress rats.","date":"2022","source":"Translational neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/36212606","citation_count":3,"is_preprint":false},{"pmid":"36305088","id":"PMC_36305088","title":"Genetic Analysis of RASD1 as a Candidate Gene for Schizophrenia.","date":"2022","source":"Balkan medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/36305088","citation_count":2,"is_preprint":false},{"pmid":"39014290","id":"PMC_39014290","title":"Long non-coding RNA SIX1-1 promotes proliferation of cervical cancer cells via negative transcriptional regulation of RASD1.","date":"2024","source":"Human cell","url":"https://pubmed.ncbi.nlm.nih.gov/39014290","citation_count":1,"is_preprint":false},{"pmid":"41627676","id":"PMC_41627676","title":"Hypermethylation-mediated silencing of RASD1 drives multiple myeloma pathogenesis.","date":"2026","source":"Blood research","url":"https://pubmed.ncbi.nlm.nih.gov/41627676","citation_count":0,"is_preprint":false},{"pmid":"41254156","id":"PMC_41254156","title":"HHQG ameliorates acute liver injury (ALI) by inhibiting NLRP3 activation through RASD1-mediated regulation of the PKCδ-NF-κB signaling pathway.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/41254156","citation_count":0,"is_preprint":false},{"pmid":"41698630","id":"PMC_41698630","title":"S-nitrosylation of Dexras1 attenuates fear memory generalization in the infralimbic cortex.","date":"2026","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/41698630","citation_count":0,"is_preprint":false},{"pmid":"39682783","id":"PMC_39682783","title":"Correction: Xin et al. Dexras1 Induces Dysdifferentiation of Oligodendrocytes and Myelin Injury by Inhibiting the cAMP-CREB Pathway after Subarachnoid Hemorrhage. Cells 2022, 11, 2976.","date":"2024","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/39682783","citation_count":0,"is_preprint":false},{"pmid":"41807756","id":"PMC_41807756","title":"Dexras1 plays a crucial role in glucocorticoid-induced osteonecrosis of the femoral head by mediating imbalance between osteogenesis and adipogenesis.","date":"2026","source":"Cellular and molecular life sciences : CMLS","url":"https://pubmed.ncbi.nlm.nih.gov/41807756","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.01.25330641","title":"Optimizing Gene Selection and Network-Level Insights in Hypertrophic Cardiomyopathy: A Novel Genetic Algorithm Combined with WGCNA and Statistical Filtering","date":"2025-07-02","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.01.25330641","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":36079,"output_tokens":8119,"usd":0.115011,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17586,"output_tokens":4824,"usd":0.104265,"stage2_stop_reason":"end_turn"},"total_usd":0.219276,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"Dexras1 physically interacts with the nNOS adaptor protein CAPON, forming a ternary complex with nNOS and CAPON that enhances nNOS-mediated activation of Dexras1; Dexras1 is activated by NO donors and by NMDA receptor-stimulated NO synthesis in cortical neurons, establishing it as a physiologic NO effector downstream of nNOS.\",\n      \"method\": \"Co-immunoprecipitation (ternary complex), GTPase activation assays with NO donors and NMDA stimulation in cortical neurons, genetic validation using nNOS-/- mice showing selective reduction of Dexras1 activation\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, functional GTPase assay, in vivo genetic epistasis (nNOS-/- mice), multiple orthogonal methods in one study, independently confirmed by subsequent studies\",\n      \"pmids\": [\"11086993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"S-nitrosylation of Dexras1 occurs exclusively on Cys11; mutagenesis of Cys11 abolished NO donor-mediated activation of Dexras1, identifying this single residue as the site of NO-mediated guanine nucleotide exchange activation.\",\n      \"method\": \"Nitrosopeptide mapping (2D peptide chromatography of radiolabeled S-nitrosylated cysteines), site-directed mutagenesis of Cys11\",\n      \"journal\": \"Chemistry & biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — novel in vitro biochemical mapping method plus mutagenesis validation, single lab but two orthogonal methods with rigorous controls\",\n      \"pmids\": [\"12498886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dexras1 binds to PAP7 (peripheral benzodiazepine receptor-associated protein), which in turn binds DMT1 (divalent metal transporter 1), establishing a signaling cascade: NMDA receptor activation → nNOS → S-nitrosylation/activation of Dexras1 → PAP7 → DMT1 → iron uptake in neurons.\",\n      \"method\": \"Co-immunoprecipitation of Dexras1-PAP7 and PAP7-DMT1; functional iron uptake assays in cortical neurons; iron chelation rescue of NMDA neurotoxicity\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP defining the complex, functional iron uptake assays, pharmacological rescue, multiple orthogonal methods, independently replicated in later studies\",\n      \"pmids\": [\"16908409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Dexras1 couples NMDA receptor and light input to Gi/o and ERK activation in the suprachiasmatic nucleus (SCN); genetic deletion of Dexras1 eliminates a pertussis-sensitive circadian response to NMDA and reduces photic entrainment, while greatly potentiating nonphotic responses to neuropeptide Y and arousal.\",\n      \"method\": \"Gene-targeted dexras1-/- mice; circadian behavioral assays; pharmacological pertussis toxin treatment; ERK/MAPK activation assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined behavioral and molecular phenotypes, pertussis toxin epistasis, replicated and extended by multiple subsequent studies\",\n      \"pmids\": [\"15339652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Dexras1 inhibits signal transduction from the Gi-coupled formyl peptide receptor (FPR) to ERK1/2; while Dexras1 alone weakly activates ERK2, it attenuates ligand-stimulated FPR-to-ERK signaling and impairs pertussis toxin-catalyzed ADP-ribosylation of membrane Gi-alpha, suggesting it acts very proximally at receptor-Gi coupling.\",\n      \"method\": \"Co-transfection of Dexras1 and FPR in COS-7 and HEK293 cells; immune complex in vitro kinase assay for HA-Erk-2; GTPγS binding assay; ADP-ribosylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus multiple biochemical readouts (GTPγS binding, ADP-ribosylation) in two cell lines, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11751935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Constitutively active Dexras1 (A178V mutant) inhibits cAMP-stimulated peptide hormone secretion in AtT-20 corticotroph cells; this inhibition requires prenylation, as deletion of the CAAX box (C277term) abolishes the effect. Wild-type Dexras1 had no effect on cAMP-stimulated secretion.\",\n      \"method\": \"Transient co-transfection with human GH secretion reporter; 8-Br-cAMP stimulation assay; GTP-binding assay of wild-type and mutant Dexras1; CAAX deletion mutagenesis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — functional secretion assay with constitutively active and dominant-negative mutants plus CAAX mutagenesis establishing prenylation dependence, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11356714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Dexras1 inhibits adenylyl cyclase activity in a pertussis toxin-sensitive and RGS4-sensitive manner, but independently of dominant-interfering Gi-alpha2 mutants, indicating it activates both Gi-alpha- and Gβγ-dependent arms of Gi signaling. Dexras1 also decreases forskolin-stimulated CREB activation.\",\n      \"method\": \"cAMP measurement assays in cells co-expressing constitutively active Gsα(Q227L) and Dexras1; pertussis toxin treatment; RGS4 co-expression; dominant-interfering Gi mutants; CREB-luciferase reporter\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cAMP and CREB reporter assays with pharmacological and genetic dissection of pathway, single lab\",\n      \"pmids\": [\"15020218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Dexras1 blocks Gβγ-dependent heterologous sensitization of adenylyl cyclase 1 (AC1) induced by persistent D2L receptor activation; this block requires nucleotide binding, as the Dexras1-G31V mutant is without effect. Dexras1 also reduces D2L receptor-mediated ERK1/2 activation by ~50% but does not alter acute D2L receptor inhibition of AC1.\",\n      \"method\": \"cAMP assay in HEK293 cells; ERK1/2 phosphorylation assay; betaARK-ct Gβγ scavenger experiment; Dexras1-G31V nucleotide-binding mutant\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional AC and ERK assays with nucleotide-binding mutant epistasis and Gβγ scavenger, single lab\",\n      \"pmids\": [\"15913563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A glucocorticoid response element (GRE) in the 3'-flanking region (~2.3 kb downstream of the poly(A) signal) of the human Dexras1 gene is required for rapid glucocorticoid-induced transcription; a point mutation in the 15-bp GRE abolishes glucocorticoid responsiveness.\",\n      \"method\": \"Luciferase reporter assay with GRE-containing 3'-flanking region; site-directed point mutagenesis of GRE\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with mutagenesis defining the regulatory element, single lab\",\n      \"pmids\": [\"12818426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Dexras1 binds to the PTB2 domain of the adaptor protein FE65 and potently suppresses FE65-APP intracellular domain-mediated transcription (including GSK3β); Dexras1 and APP can simultaneously bind FE65 PTB2. Phosphorylation of FE65 Tyr547 reduces Dexras1-FE65 binding. siRNA knockdown of Dexras1 enhances GSK3β expression and increases Tau phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation; GST pulldown; luciferase transcription reporter; siRNA knockdown; Western blot for Tau phosphorylation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and pulldown plus functional reporter and knockdown phenotype, single lab\",\n      \"pmids\": [\"18922798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dexras1 is required for NO-mediated (but not H2O2- or staurosporine-mediated) iron influx and neuronal death; deletion of Dexras1 in mice attenuates NO-mediated cell death in primary cortical neurons and protects retinal ganglion cells in vivo from NMDA excitotoxicity.\",\n      \"method\": \"Dexras1 knockout mice; primary cortical neuron cultures; retinal ganglion cell survival assays in vivo; iron chelation experiments; cell death assays with multiple apoptotic stimuli\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with both in vitro and in vivo phenotypic readouts, stimulus specificity demonstrated, replicated across cell types\",\n      \"pmids\": [\"23426685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dexras1 is required for adipogenesis; depletion of Dexras1 abolishes adipogenic differentiation of 3T3-L1 cells, overexpression elicits adipogenesis, and Dexras1-deleted mice show reduced adiposity and diminished diet-induced weight gain.\",\n      \"method\": \"Dexras1 knockdown and overexpression in 3T3-L1 cells; mouse embryonic fibroblasts from Dexras1-/- mice; in vivo diet-induced obesity model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss- and gain-of-function in vitro plus in vivo KO validation, multiple orthogonal cell and animal models\",\n      \"pmids\": [\"24297897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dexras1 mediates adipogenesis downstream of glucocorticoids by linking to IGF-1 signaling: upon insulin/IGF-1 treatment, Dexras1 translocates to the plasma membrane via its unique C-terminal domain (aa 223–276), activates MAPK through interaction with Shc and Raf, and drives CCAAT/enhancer binding protein β (C/EBPβ) phosphorylation and mitotic clonal expansion.\",\n      \"method\": \"Dexras1 C-terminal deletion mutants; plasma membrane fractionation/subcellular localization; Co-IP of Dexras1 with Shc and Raf; MAPK phosphorylation assays; C/EBPβ phosphorylation assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular localization with domain mutants plus Co-IP and downstream signaling assays, single lab\",\n      \"pmids\": [\"27345868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PKA phosphorylates Dexras1 on Ser253, which suppresses iron influx by reducing S-nitrosylation of Dexras1 in a dose-dependent manner; adiponectin modulates Dexras1 iron trafficking via PKA. This establishes a functional crosstalk between S-nitrosylation and phosphorylation on Dexras1.\",\n      \"method\": \"In vitro PKA phosphorylation assay; site-directed mutagenesis (Ser253); S-nitrosylation detection assay; iron influx assay; adiponectin treatment\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay with site-directed mutagenesis and S-nitrosylation readout, single lab\",\n      \"pmids\": [\"26358293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Dexras1 (AGS1) decreases cAMP accumulation downstream of dopamine D1 receptor signaling independently of pertussis toxin (suggesting interaction with a Gα-i monomer rather than the heterotrimeric Gi complex), and both AGS1/Dexras1 and Rhes associate with GTP-bound Gα-i in pull-down assays. Neither protein interacted with the D1 receptor directly.\",\n      \"method\": \"cAMP accumulation assay in transfected cells; pertussis toxin treatment; GTP-Gα-i pull-down assay\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional cAMP assay plus pull-down with GTP-Gαi, single lab, two methods\",\n      \"pmids\": [\"21374700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rasd1 interacts with Ear2 (Nr2f6), a nuclear receptor/negative regulator of renin transcription, via the ligand binding domain of Ear2; this interaction inhibits Ear2-mediated transcriptional repression and upregulates endogenous renin transcription. Missense mutations in Rasd1 that attenuate Ear2 binding also abolish the functional effect. GTP-hydrolysis activity of Rasd1 is required.\",\n      \"method\": \"Yeast two-hybrid screen; in vitro pulldown; Co-IP in COS-7 cells and from mouse brain/HEK293T lysates; renin promoter-luciferase reporter; real-time RT-PCR; shRNA knockdown; domain mapping with Ear2 deletion mutants\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid validated by Co-IP from endogenous tissue plus functional reporter with multiple mutants, single lab\",\n      \"pmids\": [\"21247419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Rasd1 interacts with NonO (p54nrb) via affinity pulldown and Co-IP; the GTP-hydrolysis activity of Rasd1 is required for functional interaction. Rasd1 modulates NonO coactivator function at CRE-site-containing target genes in the cAMP pathway, as shown by reporter gene assays and chromatin immunoprecipitation.\",\n      \"method\": \"Affinity pulldown; co-immunoprecipitation; indirect immunofluorescence; luciferase reporter gene assays; chromatin immunoprecipitation; gene knockdown\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal binding assays (pulldown, Co-IP, ChIP) plus functional reporter, single lab\",\n      \"pmids\": [\"21915321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Dexras1 limits the capacity of PACAP/PAC1 to affect ERK/MAPK in the SCN during the late night, and modulates light-induced ERK/MAPK in a time-of-day-specific manner; daytime photic phase advances are mediated by a pathway that stimulates ERK/MAPK in the SCN shell and triggers downregulation of clock protein expression, all dependent on Dexras1.\",\n      \"method\": \"dexras1-/- mice; circadian behavioral phase response curve analysis; ERK/MAPK phosphorylation assays; clock protein immunohistochemistry in SCN\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple molecular and behavioral readouts in vivo, extensive mechanistic follow-up, replicated findings\",\n      \"pmids\": [\"17167088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Glucocorticoid receptor (GR) and STAT5b cooperatively drive glucocorticoid-induced Rasd1 expression in pancreatic islets; prolactin inhibits this GR/STAT5b transcriptional activity on the Rasd1 gene. Rasd1 knockdown abolishes the inhibitory effects of dexamethasone on insulin secretion and on PKA, PKC, and ERK1/2 pathways in β-cells.\",\n      \"method\": \"Chromatin immunoprecipitation (GR and STAT5b on Rasd1 promoter); siRNA knockdown of Rasd1; insulin secretion assay; Western blot of PKA, PKC, ERK1/2 phosphorylation; immunofluorescence localization in β-cells\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP defining transcriptional mechanism plus functional knockdown with defined signaling readouts, single lab\",\n      \"pmids\": [\"22700767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dexras1 activates TRPC4 channels when co-expressed; among Ras family members tested, Rasd1 is uniquely capable of activating TRPC4, and this requires functional Gαi1 and Gαi3. Dexamethasone increases Rasd1 protein expression in INS-1 cells and thereby triggers TRPC4-like cationic current.\",\n      \"method\": \"Electrophysiology (patch-clamp) of TRPC4 currents in cells co-expressing Rasd1 and other Ras family members; Gαi1/Gαi3 co-expression experiments; dexamethasone treatment of INS-1 cells with current recording\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — electrophysiology with Ras family selectivity panel and Gαi epistasis, single lab\",\n      \"pmids\": [\"25502319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic and pharmacological ablation of the Dexras1-mediated neuronal iron pathway increases glutamatergic transmission; lysosomal iron is identified as the main source for iron signaling that modulates NMDA receptor activity via the PKC/Src/NR2A pathway, establishing Dexras1 as a modulator of synaptic excitability.\",\n      \"method\": \"Dexras1-/- mice; voltage-sensitive dye imaging of hippocampal slices; whole-cell patch-clamp of synaptic NMDA currents; pharmacological iron chelation; Western blot for NR2A and PKC/Src pathway components\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with electrophysiology plus pharmacological validation in hippocampal slice, single lab\",\n      \"pmids\": [\"27080392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Rasd1 inhibits cAMP-induced gene expression (c-Fos, Nr4a1, pCREB) in AtT20 cells and in rat supraoptic nucleus neurons; these effects are dependent on isoprenylation, as farnesyltransferase inhibitor FTI-277 and CAAX box deletion prevent inhibition. In vivo lentiviral Rasd1 overexpression in rat SON diminishes cAMP-inducible genes under osmotic stress.\",\n      \"method\": \"Rasd1 overexpression and shRNA knockdown in AtT20 cells; dexamethasone treatment; FTI-277 treatment; CAAX deletion mutant; lentiviral injection into rat supraoptic nucleus; Western blot and immunofluorescence for CREB phosphorylation and target genes\",\n      \"journal\": \"Molecular brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain/loss-of-function with domain-mutant mechanistic dissection, single lab\",\n      \"pmids\": [\"26739966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RASD1 knockdown in mouse GV oocytes arrests meiotic maturation at metaphase I, causing disrupted spindle formation and chromosomal misalignment; the MI-to-MII transition factors Obox4 and Arp2/3 are misregulated by Rasd1 knockdown, revealing a role for RASD1 in cytokinesis progression and spindle formation during oocyte maturation.\",\n      \"method\": \"RNAi microinjection into mouse GV oocytes; time-lapse video microscopy; immunofluorescence for spindle and chromosomes; qRT-PCR for Obox4 and Arp2/3\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNAi loss-of-function in oocytes with live imaging and molecular readouts, single lab\",\n      \"pmids\": [\"27997888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dexras1 is required for exercise-triggered recruitment of quiescent neural progenitors into the cell cycle in the hippocampal neurogenic niche; dexras1-/- mice show abolished exercise-dependent ERK/MAPK and CREB activation, impaired NR2A upregulation, and reduced bdnf/trkB/vegf-a induction in the dentate gyrus. NMDA receptor pharmacological inhibition enhances SGZ proliferation in wild-type but not dexras1-/- mice, placing Dexras1 downstream of NMDA receptors in this pathway.\",\n      \"method\": \"dexras1-/- mice; exercise paradigm; BrdU incorporation/cell survival assays; Western blot for ERK/MAPK, CREB; RT-PCR for NR2A, bdnf, trkB, vegf-a; NMDA receptor antagonist pharmacology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple molecular and cellular readouts in vivo plus pharmacological epistasis, single lab\",\n      \"pmids\": [\"29593295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dexras1 deletion attenuates oxidative stress-induced neurodegeneration in experimental optic neuritis (EAE model); Dexras1 is activated by S-nitrosylation by both iNOS (in activated microglia/macrophages) and nNOS (in neurons), and iron entry triggered by NO-activated Dexras1 contributes to retinal ganglion cell and axonal loss during optic neuritis.\",\n      \"method\": \"Dexras1-/- mice in EAE model; visual function assessment; retinal ganglion cell and axon counting; iron chelator (deferiprone) treatment\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO plus pharmacological rescue with defined neuroprotective readout in vivo, single lab\",\n      \"pmids\": [\"31406150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"S-nitrosylation of Dexras1 (SNO-Dexras1) is elevated in peri-infarct cortex after stroke; AAV-mediated knockdown of Dexras1 or overexpression of dominant-negative Dexras1-C11S (non-nitrosylatable) promotes motor recovery, increases neuronal excitability (spike number and mEPSC frequency), and enhances dendritic spine density in peri-infarct cortex. Conversely, Dexras1 overexpression worsens stroke outcome.\",\n      \"method\": \"Photothrombotic stroke model in mice; AAV microinjection (Dexras1 KD, Dexras1-C11S overexpression, Dexras1 overexpression); grid-walking and cylinder behavioral tasks; Western blot for SNO-Dexras1; electrophysiology (spike recording, mEPSC); Golgi staining for dendritic spines\",\n      \"journal\": \"CNS neuroscience & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain/loss-of-function with dominant-negative mutant, electrophysiology and morphological readouts, single lab\",\n      \"pmids\": [\"39749632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Dexras1 induces oligodendrocyte dysdifferentiation and myelin injury after subarachnoid hemorrhage by inhibiting the cAMP-CREB pathway; Dexras1 overexpression worsens OPC dysdifferentiation while knockdown ameliorates myelin injury and glial activation after SAH.\",\n      \"method\": \"Intracerebroventricular lentiviral Dexras1 overexpression/knockdown in SAH rat model; immunofluorescence; transmission electron microscopy; Western blot for cAMP-CREB pathway components; primary neuron treatment with oxyhemoglobin\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain/loss-of-function with cellular and molecular readouts, single lab\",\n      \"pmids\": [\"36230939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KIAA1429 increases the m6A modification level of RASD1 mRNA and enhances its degradation in an m6A-YTHDF2-dependent manner, thereby downregulating RASD1 expression in gastric cancer cells.\",\n      \"method\": \"MeRIP-seq; MeRIP-qPCR; RNA stability assay; RNA immunoprecipitation (RIP); RNA pull-down; dual luciferase reporter; Western blot\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RNA biochemistry methods (MeRIP-seq, RIP, RNA stability) establishing m6A-YTHDF2 mechanism on RASD1 mRNA, single lab\",\n      \"pmids\": [\"38902717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The lncRNA SIX1-1 promotes cervical cancer cell proliferation by recruiting DNMT1 to the RASD1 promoter, causing its methylation and transcriptional silencing; reduced RASD1 expression then activates the cAMP/PKA/CREB signaling pathway to promote proliferation.\",\n      \"method\": \"SIX1-1 knockdown in vitro and in vivo; nuclear localization by fractionation; Co-IP/binding of SIX1-1 with DNMT1; chromatin immunoprecipitation (DNMT1 on RASD1 promoter); bisulfite sequencing; RASD1 rescue experiments\",\n      \"journal\": \"Human cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and bisulfite sequencing defining epigenetic mechanism, rescue experiments, single lab\",\n      \"pmids\": [\"39014290\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RASD1/Dexras1 is a brain-enriched Ras-family small GTPase that is transcriptionally induced by glucocorticoids (via a 3'-GRE) and activated post-translationally by S-nitrosylation on Cys11, a modification mediated by nNOS and greatly enhanced by the nNOS–CAPON–Dexras1 ternary complex; once activated, it couples to the Gi/o–ERK/MAPK cascade in the suprachiasmatic nucleus to modulate photic and nonphotic circadian entrainment, drives neuronal iron uptake by recruiting PAP7 and DMT1 (thereby mediating NMDA-excitotoxic cell death), inhibits adenylyl cyclase/cAMP–PKA–CREB signaling in a prenylation-dependent manner, links glucocorticoid and IGF-1 signals to MAPK-driven adipogenesis through membrane translocation via its C-terminal domain and interaction with Shc/Raf, suppresses FE65–APP-mediated transcription by binding the FE65 PTB2 domain, modulates renin transcription via interaction with Ear2, and activates TRPC4 channels through Gαi; additionally, phosphorylation of Dexras1 on Ser253 by PKA counteracts S-nitrosylation to suppress iron trafficking, and RASD1 mRNA stability is regulated by m6A methylation via the KIAA1429–YTHDF2 axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RASD1/Dexras1 is a glucocorticoid-inducible, brain-enriched Ras-family small GTPase that transduces nitric oxide and hormonal signals into control of Gi/o-coupled signaling, neuronal iron handling, and circadian and metabolic physiology [#0, #3, #11]. It is activated post-translationally by S-nitrosylation on Cys11, a modification generated by nNOS and amplified within an nNOS–CAPON–Dexras1 ternary complex downstream of NMDA receptor activation [#0, #1]. Activated Dexras1 recruits PAP7, which bridges to the divalent metal transporter DMT1 to drive NO-dependent neuronal iron uptake; this iron-influx pathway mediates NMDA excitotoxic and oxidative neuronal death and modulates synaptic NMDA receptor activity, and is opposed by PKA phosphorylation on Ser253, which suppresses S-nitrosylation [#2, #10, #13, #20, #24]. In the suprachiasmatic nucleus Dexras1 couples NMDA and photic input to Gi/o and ERK/MAPK signaling, shaping photic versus nonphotic circadian entrainment and time-of-day-specific clock responses [#3, #17]. As a negative regulator of cAMP signaling it acts proximally at receptor–Gi coupling and adenylyl cyclase, inhibiting cAMP/PKA/CREB-driven gene expression and hormone secretion in a prenylation-dependent manner [#4, #6, #21], and it uniquely activates TRPC4 channels through Gαi [#19]. Dexras1 also links glucocorticoid and IGF-1 signals to MAPK-driven adipogenesis via C-terminal membrane translocation and interaction with Shc and Raf [#11, #12], and engages transcriptional regulators including FE65, Ear2/Nr2f6, and NonO to modulate APP, renin, and CRE-dependent gene programs [#9, #15, #16]. RASD1 expression is itself controlled by glucocorticoid receptor/STAT5b transcription and by post-transcriptional and epigenetic silencing in cancer through m6A-YTHDF2-mediated mRNA degradation and DNMT1-dependent promoter methylation [#18, #27, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established Dexras1 as a physiologic effector of nitric oxide by placing it in a signaling complex with nNOS, answering how this GTPase is activated in neurons.\",\n      \"evidence\": \"Co-IP of an nNOS–CAPON–Dexras1 ternary complex with GTPase activation assays and nNOS-/- mice in cortical neurons\",\n      \"pmids\": [\"11086993\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the chemical site of NO modification\", \"Downstream effectors of activated Dexras1 not yet identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped NO activation to a single residue, defining Cys11 S-nitrosylation as the molecular switch for nucleotide exchange.\",\n      \"evidence\": \"Nitrosopeptide mapping and Cys11 site-directed mutagenesis in vitro\",\n      \"pmids\": [\"12498886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of how nitrosylation drives exchange not resolved\", \"In vivo contribution of Cys11 to phenotypes addressed only later\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined Dexras1 as a negative regulator of cAMP and Gi-coupled receptor signaling acting at the receptor–Gi interface, with prenylation required for function.\",\n      \"evidence\": \"Co-transfection with FPR and a cAMP-secretion reporter, GTPγS binding, ADP-ribosylation, and CAAX-deletion mutants in COS-7/HEK293/AtT-20 cells\",\n      \"pmids\": [\"11751935\", \"11356714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of action at Gi not structurally defined\", \"Endogenous receptor contexts not established\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified an unusual 3'-flanking GRE controlling glucocorticoid-induced Dexras1 transcription, explaining its hormonal inducibility.\",\n      \"evidence\": \"Luciferase reporter with the 3'-flanking GRE and point mutagenesis\",\n      \"pmids\": [\"12818426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reporter-based; endogenous chromatin occupancy shown only in later work\", \"Tissue-specificity of the element not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated in vivo that Dexras1 couples NMDA and light input to Gi/o-ERK signaling to shape circadian entrainment.\",\n      \"evidence\": \"dexras1-/- mice with circadian behavioral assays, pertussis toxin epistasis, and ERK activation readouts\",\n      \"pmids\": [\"15339652\", \"15020218\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link from Dexras1 to ERK in the SCN not fully reconstituted\", \"Relationship between Gαi and Gβγ arms incompletely defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved how NO-activated Dexras1 drives neuronal iron uptake by identifying the PAP7–DMT1 cascade, connecting the GTPase to excitotoxicity.\",\n      \"evidence\": \"Reciprocal Co-IP of Dexras1-PAP7 and PAP7-DMT1, iron uptake assays, and iron-chelation rescue of NMDA neurotoxicity\",\n      \"pmids\": [\"16908409\", \"17167088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structure of the Dexras1–PAP7–DMT1 complex unknown\", \"How activation triggers DMT1 recruitment mechanistically unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended Dexras1 into transcriptional control by showing it binds the FE65 PTB2 domain and suppresses FE65-APP-driven gene expression, including GSK3β and Tau effects.\",\n      \"evidence\": \"Co-IP, GST pulldown, luciferase reporter, and siRNA knockdown with Tau phosphorylation Western blots\",\n      \"pmids\": [\"18922798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GTPase-dependence of FE65 binding not dissected\", \"In vivo relevance to APP biology not established\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined nuclear and Gαi-monomer partners of Rasd1 (Ear2, NonO, GTP-Gαi) showing GTP-hydrolysis-dependent regulation of renin and CRE-dependent transcription.\",\n      \"evidence\": \"Yeast two-hybrid, pulldown, Co-IP from tissue, promoter-luciferase, ChIP, and GTP-Gαi pulldowns with nucleotide mutants\",\n      \"pmids\": [\"21247419\", \"21915321\", \"21374700\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether nuclear and membrane functions occur in the same cells unclear\", \"Direct vs indirect transcriptional effects not fully separated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided genetic proof that Dexras1 is required for NO-specific iron-mediated neuronal death and for adipogenesis, defining distinct physiologic outputs.\",\n      \"evidence\": \"Dexras1 knockout mice with stimulus-specific neuronal death and retinal protection assays, and 3T3-L1/MEF adipogenesis with in vivo diet-induced obesity\",\n      \"pmids\": [\"23426685\", \"24297897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between Dexras1 activation and adipogenic transcription not yet defined at this stage\", \"Iron-death pathway downstream of DMT1 not fully traced\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed PKA phosphorylation of Ser253 as a counter-regulatory switch that suppresses S-nitrosylation and iron influx, establishing PTM crosstalk.\",\n      \"evidence\": \"In vitro PKA assay, Ser253 mutagenesis, S-nitrosylation detection, and iron influx assays with adiponectin treatment\",\n      \"pmids\": [\"26358293\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of phosphorylation–nitrosylation antagonism unknown\", \"In vivo significance of Ser253 not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mechanistically connected glucocorticoid/IGF-1 signaling to MAPK-driven adipogenesis through C-terminal membrane translocation and Shc/Raf binding, and identified TRPC4 activation as a Gαi-dependent output.\",\n      \"evidence\": \"C-terminal deletion mutants, membrane fractionation, Co-IP with Shc/Raf, C/EBPβ assays, and TRPC4 patch-clamp with Gαi epistasis\",\n      \"pmids\": [\"27345868\", \"25502319\", \"26739966\", \"27080392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GTPase activity state during membrane translocation not defined\", \"Channel-gating mechanism for TRPC4 not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed Dexras1 downstream of NMDA receptors in activity- and exercise-dependent neural progenitor recruitment and synaptic excitability control.\",\n      \"evidence\": \"dexras1-/- mice with exercise paradigm, BrdU assays, ERK/CREB and neurotrophin readouts, and NMDA antagonist epistasis; hippocampal slice electrophysiology\",\n      \"pmids\": [\"29593295\", \"27997888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-autonomous vs niche contributions not separated\", \"Mechanism linking iron signaling to NR2A regulation incompletely defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated that SNO-Dexras1 limits recovery after CNS injury, with non-nitrosylatable Dexras1-C11S and knockdown promoting plasticity and recovery in stroke and white-matter injury.\",\n      \"evidence\": \"Photothrombotic stroke and SAH models with AAV/lentiviral manipulation, behavioral, electrophysiological, and morphological readouts\",\n      \"pmids\": [\"39749632\", \"36230939\", \"31406150\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Therapeutic targeting strategies not validated\", \"Relative contributions of iron vs cAMP arms in injury not dissected\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified post-transcriptional and epigenetic silencing of RASD1 in cancer, linking its loss to cAMP/PKA/CREB-driven proliferation.\",\n      \"evidence\": \"MeRIP-seq/RIP/RNA-stability assays for KIAA1429–m6A–YTHDF2 in gastric cancer and ChIP/bisulfite sequencing for lncRNA SIX1-1–DNMT1 promoter methylation in cervical cancer\",\n      \"pmids\": [\"38902717\", \"39014290\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RASD1 acts as a tumor suppressor in vivo not established\", \"Direct GTPase signaling output suppressed in tumors not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the distinct Dexras1 outputs — neuronal iron uptake, cAMP suppression, transcriptional partner regulation, and adipogenic membrane signaling — are coordinated by its activation state and subcellular localization within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of Dexras1 in its active or partner-bound states\", \"Unclear how PTM state dictates choice among competing effectors\", \"Spatial segregation of nuclear vs membrane functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9, 15, 16]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 6, 7, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [15, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 7]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [3, 17]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 10, 20, 23]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [10, 24]}\n    ],\n    \"complexes\": [\"nNOS–CAPON–Dexras1 ternary complex\"],\n    \"partners\": [\"CAPON\", \"NOS1\", \"PAP7\", \"DMT1\", \"FE65\", \"NR2F6\", \"NONO\", \"SHC1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}