{"gene":"DDIT4","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2002,"finding":"RTP801/DDIT4 is a novel HIF-1-responsive gene whose expression is strongly upregulated by hypoxia both in vitro and in vivo. Its overexpression in dividing cells (MCF7, PC12) protected against hypoxia/glucose deprivation and H2O2-triggered apoptosis by dramatically reducing reactive oxygen species generation, while in non-dividing neuron-like PC12 cells it promoted apoptosis and increased sensitivity to ischemic injury and oxidative stress.","method":"Tetracycline-repressible promoter-driven overexpression, ROS measurement, cell viability assays, in vivo ischemic stroke model","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean gain-of-function in multiple cell lines with ROS readout, single lab, no mechanistic target identified","pmids":["11884613"],"is_preprint":false},{"year":2005,"finding":"RTP801/REDD1 and its paralog RTP801L/REDD2 are stress-induced inhibitors of mTOR signaling. Both proteins work downstream of AKT and upstream of TSC2 to inhibit mTOR-dependent phosphorylation of S6K and 4EBP1.","method":"Overexpression, siRNA knockdown, phosphorylation assays of mTOR substrates (S6K, 4EBP1), epistasis placing REDD1 downstream of AKT and upstream of TSC2","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis established with multiple downstream readouts, replicated across multiple subsequent studies","pmids":["15632201"],"is_preprint":false},{"year":2005,"finding":"REDD1 inhibits mTOR signaling through the TSC1/TSC2 complex. REDD1 is essential for mTOR regulation in response to hypoxia and energy stress; cells lacking REDD1 exhibit defective mTOR regulation under these stress signals.","method":"Genetic knockout/knockdown, TSC1/2 epistasis, cell size measurements in Drosophila and mammalian cells","journal":"Cell cycle (Georgetown, Tex.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis across multiple organisms, replicated by multiple independent labs","pmids":["16258273"],"is_preprint":false},{"year":2006,"finding":"RTP801 protein is elevated in dopaminergic neurons of the substantia nigra in Parkinson's disease. RTP801 overexpression is sufficient to promote neuronal death; its knockdown via shRNA is neuroprotective in cellular PD models. The mechanism involves repression of mTOR kinase activity, and death is inhibited by shRNAs targeting TSC2, a protein with which RTP801 interacts.","method":"Immunohistochemistry on postmortem PD brains, shRNA knockdown, overexpression in PC12 cells, co-immunoprecipitation with TSC2, mTOR activity assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP for TSC2 interaction, loss-of-function with defined phenotype, human postmortem validation","pmids":["17005863"],"is_preprint":false},{"year":2008,"finding":"RTP801 mediates neuron death in Parkinson's disease models by suppressing mTOR signaling, which in turn reduces phosphorylation and activation of Akt. This sequential mechanism (stress → RTP801 → mTOR inhibition → Akt dephosphorylation → neuronal death) was validated by finding depletion of phospho-Akt (but not total Akt) in postmortem dopaminergic neurons from PD patients.","method":"shRNA knockdown of RTP801, 6-OHDA treatment, phospho-Akt measurements, postmortem PD brain immunohistochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic pathway established with genetic knockdown plus human validation, sequential mechanism confirmed","pmids":["19118169"],"is_preprint":false},{"year":2010,"finding":"Rtp801/REDD1 inhibits mTOR by stabilizing the TSC1-TSC2 inhibitory complex and enhances oxidative stress-dependent cell death. In cigarette smoke-induced lung injury, Rtp801 is both necessary and sufficient for NF-κB activation; Rtp801 knockout mice are protected against acute cigarette smoke-induced lung injury and emphysema, partly via increased mTOR signaling.","method":"Rtp801 knockout mice, cigarette smoke exposure model, NF-κB reporter assays, forced lung expression of Rtp801 plasmid, mTOR signaling readouts","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — constitutive knockout and gain-of-function in vivo with multiple orthogonal mechanistic readouts, human emphysema tissue validation","pmids":["20473305"],"is_preprint":false},{"year":2011,"finding":"Glucocorticoid-induced elevation of Dig2/RTP801/REDD1 contributes to autophagy induction in lymphocytes by inhibiting mTOR signaling. RNAi-mediated suppression of REDD1 reduces both mTOR inhibition and autophagy in glucocorticoid-treated lymphocytes, and REDD1 knockout thymocytes show similar effects. REDD1-mediated autophagy promotes cell survival under glucocorticoid stress.","method":"RNAi knockdown, Rtp801/Redd1 knockout murine thymocytes, autophagy quantification, mTOR activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — both RNAi and genetic knockout with orthogonal autophagy and mTOR readouts in primary cells","pmids":["21733849"],"is_preprint":false},{"year":2011,"finding":"RTP801/REDD1 regulates the timing of cortical neurogenesis and neuron migration. RTP801 levels are high in embryonic cortical neuroprogenitors and diminished in newborn neurons. In vivo and in vitro knockdown of RTP801 accelerates cell cycle exit and neuronal differentiation, and disrupts migration of newborn neurons to the cortical plate, causing ectopic localization of mature neurons.","method":"In utero electroporation-based shRNA knockdown, in vitro RTP801 overexpression/knockdown, BrdU labeling, immunohistochemistry","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo and in vitro loss- and gain-of-function with defined phenotypic readouts of neurogenesis timing and migration","pmids":["21368030"],"is_preprint":false},{"year":2004,"finding":"The hypoxia-inducible transcription of the RTP801 promoter is mediated by an Sp1 binding site in the region between -495 and -446 bp. Co-transfection with antisense Sp1 oligonucleotides reduced hypoxia-induced RTP801 promoter activity.","method":"Promoter deletion and mutation analysis, luciferase reporter assays, antisense Sp1 co-transfection","journal":"Pharmaceutical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter deletion and point mutation analyses with functional reporter, single lab","pmids":["15180327"],"is_preprint":false},{"year":2005,"finding":"Arsenite induces RTP801 transcription through reactive oxygen species, and the transcription factors Elk-1 and C/EBP acting on an arsenic-responsive region between -1057 and -981 bp of the RTP801 promoter. The ERK pathway is partly responsible, and overexpression of Elk-1 and C/EBPβ elevates promoter activity.","method":"Promoter deletion/point mutation analysis, luciferase reporter assays, gel mobility-shift assays, antioxidant co-treatment, ERK inhibitor treatment","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutagenesis plus EMSA plus pharmacological inhibitors, single lab","pmids":["16008523"],"is_preprint":false},{"year":2005,"finding":"DNA damaging agent MMS induces RTP801 transcription through Elk-1 and C/EBPβ binding to a critical region between -1057 and -981 bp of the RTP801 promoter in human keratinocytes.","method":"Promoter deletion/mutation analysis, luciferase reporter assays, gel mobility-shift assay, anti-C/EBPβ supershift","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutagenesis plus EMSA with antibody supershift, single lab","pmids":["15751966"],"is_preprint":false},{"year":2009,"finding":"Insulin stimulates REDD1 expression in adipocytes through a phosphoinositide 3-kinase/mTOR-dependent pathway that requires HIF-1α as the transcription factor mediating REDD1 induction.","method":"Insulin stimulation of murine and human adipocytes, PI3K inhibitor treatment, HIF-1 inhibitor (echinomycin), HIF-1α siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition plus genetic knockdown of HIF-1α, single lab","pmids":["19996311"],"is_preprint":false},{"year":2013,"finding":"DDIT4/RTP801/REDD1 is expressed in Schwann cells and functions as a sustained negative regulator of PNS myelination. Loss of DDIT4 in Ddit4-null mice results in hypermyelination and enhanced mTORC1 activation in peripheral nerves, demonstrating that DDIT4 inhibits myelination via mTORC1.","method":"Ddit4-null mice, in vitro Schwann cell cultures, immunohistochemistry, electron microscopy for myelin thickness, mTORC1 phosphorylation assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined myelination phenotype and mTORC1 mechanistic link in both in vitro and in vivo models","pmids":["24048858"],"is_preprint":false},{"year":2013,"finding":"mTORC1 regulates REDD1 protein stability in a 26S proteasome-dependent manner; inhibition of mTORC1 reduces REDD1 protein stability and expression, while activation of mTORC1 increases REDD1 protein levels, establishing a novel mTORC1-REDD1 feedback loop. REDD1 degradation is not regulated by HUWE1, Cul4a, or other Cullin E3 ubiquitin ligases.","method":"mTORC1 inhibitors/activators, cycloheximide chase, proteasome inhibitors, siRNA knockdown of individual E3 ligases","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic manipulation with protein stability readouts, single lab","pmids":["23717519"],"is_preprint":false},{"year":2013,"finding":"REDD1 undergoes plasma membrane translocation triggered by GPCRs through a Ca2+/calmodulin pathway. REDD1's N-terminus and its conserved mTORC1-inhibitory motif are required for this dynamic plasma membrane interaction. Overexpression of REDD1 reduces GPCR-mediated mTORC1 activation, while depletion of endogenous REDD1 unleashes mTORC1 activity, identifying plasma membrane translocation as an inactivation mechanism for REDD1.","method":"Bioluminescent resonance energy transfer (BRET)-based plasma membrane localization assay, fluorescent live-imaging, siRNA knockdown, Ca2+/calmodulin pathway inhibitors","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BRET quantitative assay plus functional mTORC1 readouts, single lab with two orthogonal methods","pmids":["24338366"],"is_preprint":false},{"year":2014,"finding":"Parkin E3 ligase physically interacts with RTP801 and promotes its poly-ubiquitination and proteasomal degradation. Parkin knockdown elevates RTP801 in neurons; ectopic parkin protects neuronal cells from RTP801-overexpression-induced death by mediating RTP801 degradation. RTP801 is elevated in parkin knockout mouse brains and human fibroblasts from AR-JP patients.","method":"Reciprocal co-immunoprecipitation, parkin knockdown/overexpression, ubiquitination assays, parkin knockout mouse brains, human AR-JP patient fibroblasts and postmortem PD brain immunohistochemistry","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assay, genetic models, and human tissue validation across multiple orthogonal approaches","pmids":["25101677"],"is_preprint":false},{"year":2014,"finding":"REDD1 deletion prevents dexamethasone-induced skeletal muscle atrophy in vivo. REDD1-mediated mTORC1 inhibition in skeletal muscle after glucocorticoid treatment is not related to modulation of TSC2/14-3-3 binding but instead involves a mechanism linking REDD1, Akt, and PRAS40.","method":"REDD1-null mice, dexamethasone gavage, muscle weight and fiber size measurements, protein synthesis assays, mTORC1 target phosphorylation (S6, 4E-BP1, ULK1), co-immunoprecipitation for TSC2/14-3-3","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with in vivo phenotype plus mechanistic pathway dissection excluding TSC2 mechanism and implicating Akt/PRAS40","pmids":["25315696"],"is_preprint":false},{"year":2016,"finding":"NEDD4 E3 ligase polyubiquitinates RTP801 with K63-linked ubiquitin chains and targets it for degradation. NEDD4 and RTP801 interact physically in cells and in a cell-free system. NEDD4 loss of function (as occurs with neurotoxin 6-OHDA treatment) elevates RTP801, and NEDD4 knockdown toxicity in primary cortical neurons is mediated by RTP801 (double knockdown of NEDD4+RTP801 is neuroprotective).","method":"Cell-free ubiquitination assay, co-immunoprecipitation, ubiquitin-linkage specificity assays, shRNA knockdown, primary cortical neurons","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1 / Strong — cell-free reconstitution of ubiquitination, Co-IP, genetic epistasis with double knockdown, and human PD tissue validation","pmids":["27494837"],"is_preprint":false},{"year":2017,"finding":"REDD-1 promotes NF-κB activation through an atypical IKK-independent mechanism: REDD-1's C-terminal region (amino acids 178-229) interacts with and sequesters IκBα from the NF-κB/IκBα complex, enabling NF-κB activation during the delayed and persistent phases of inflammation. REDD-1 overexpression stimulates NF-κB-dependent inflammation without additional LPS stimulation.","method":"Co-immunoprecipitation of REDD-1 with IκBα, C-terminal domain mapping, REDD-1 knockdown/knockout macrophages, NF-κB reporter assays, endotoxemia mouse model","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP domain mapping with functional rescue, genetic knockout in vivo, multiple orthogonal readouts of NF-κB activation","pmids":["29547704"],"is_preprint":false},{"year":2018,"finding":"REDD1/autophagy pathway promotes NETosis in SLE neutrophils. NETosis correlates with increased REDD1 expression, and endothelin-1 (ET-1) and HIF-1α are key mediators of REDD1-driven NET release, as demonstrated by inhibition with bosentan and L-ascorbic acid respectively.","method":"Immunofluorescence, immunoblotting, NET quantification, pharmacological inhibition (bosentan, L-ascorbic acid, hydroxychloroquine), primary neutrophil cultures","journal":"Annals of the rheumatic diseases","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — pharmacological inhibitors establish upstream mediators of REDD1-driven NETs, single lab","pmids":["30563869"],"is_preprint":false},{"year":2019,"finding":"REDD1 activates a ROS-generating feedback loop in the diabetic retina. Hyperglycemia increases REDD1 expression and ROS. ROS in turn increases REDD1 (antioxidant NAC prevents REDD1 induction). REDD1 attenuates Akt/GSK3 phosphorylation in a REDD1-dependent manner, and in REDD1-deficient cells, dominant-negative Akt or constitutively active GSK3 restores ROS and mitochondrial dysfunction.","method":"REDD1-deficient mice, streptozotocin-induced diabetes, NAC antioxidant treatment, H2O2 exogenous ROS, dominant-negative Akt overexpression, constitutively active GSK3β, ROS assays","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout plus dominant-negative constructs, single lab","pmids":["31141608"],"is_preprint":false},{"year":2020,"finding":"DDIT4 is expressed in normal gastric chief cells and suppresses mTORC1 during the initial phase of paligenosis (injury-induced metaplasia). Loss of DDIT4 leads to constitutively high mTORC1, causing mitotic entry of cells harboring DNA damage and increased spontaneous tumorigenesis in mice after multiple rounds of paligenosis.","method":"DDIT4-deficient mice, CRISPR/Cas9 DDIT4-/- human gastric cells, tamoxifen/MNU mouse models, 5-FU treatment, xenografts, proliferation and DNA damage markers","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout in both mouse and human cells with defined mTORC1 and tumor formation readouts, multiple experimental systems","pmids":["32956680"],"is_preprint":false},{"year":2021,"finding":"DDIT4 S-nitrosylation at specific residues promotes assembly of the p38-MAPK signaling complex, driving hepatic ROS production. DDIT4 is a direct transcriptional target of the chromatin remodeler BRG1. S-nitrosylation-deficient DDIT4 fails to restore ROS production; compounds that influence DDIT4 S-nitrosylation (imatinib, nilotinib, nateglinide) attenuate p38-MAPK signaling and liver injury.","method":"BRG1 knockout, DDIT4 overexpression/knockdown, S-nitrosylation assays, molecular docking, in vitro and in vivo liver injury models, human liver biopsy correlation","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — S-nitrosylation assay with functional complex assembly readout, single lab with multiple orthogonal approaches","pmids":["34310076"],"is_preprint":false},{"year":2021,"finding":"p53 activates DDIT4 expression indirectly through the transcription factor RFX7. DDIT4 is required for p53 to inhibit mTORC2-dependent AKT activation and for RFX7 to inhibit mTORC1. Under physiological nutrient conditions, basal p53-RFX7-DDIT4 activity constrains mTORC1.","method":"siRNA knockdown of DDIT4 and RFX7, p53 activation, mTORC1/mTORC2 substrate phosphorylation assays, physiological cell culture media","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown epistasis with mTOR pathway readouts, single lab","pmids":["34907345"],"is_preprint":false},{"year":2021,"finding":"ATF4-dependent REDD1 and Sestrin2 expression in response to metformin is required for mTORC1 inhibition, independent of AMPK activation. siRNA knockdown of REDD1 or Sestrin2 reverses metformin-induced mTORC1 inhibition.","method":"siRNA knockdown of REDD1 and Sestrin2, western blot for mTORC1 substrates, AMPK inhibitor treatment","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic siRNA knockdown establishing necessity of REDD1 for metformin effect, single lab","pmids":["34253170"],"is_preprint":false},{"year":2022,"finding":"REDD1 promotes NF-κB activation in diabetic retina by sustaining IκB kinase complex (IKK) autophosphorylation and K63-ubiquitination, leading to IκB degradation and NF-κB activation. REDD1 deletion promotes IκB expression and reduces NF-κB DNA-binding activity. REDD1 acts upstream of IκB by enhancing IKK complex autophosphorylation and K63-ubiquitination.","method":"REDD1 knockout cells and STZ-diabetic mice, IKK autophosphorylation and K63-ubiquitination assays, IκB expression, NF-κB DNA-binding (EMSA), macrophage infiltration quantification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic deletion with multiple orthogonal biochemical readouts (ubiquitination, phosphorylation, DNA binding) plus in vivo validation","pmids":["36309088"],"is_preprint":false},{"year":2022,"finding":"Hyperglycemic conditions promote a redox-sensitive C150/C157 disulfide bond in REDD1 that inhibits its lysosomal proteolysis via chaperone-mediated autophagy (CMA). REDD1 acetylation at K129 is required for recognition by the cytosolic chaperone HSC70 and CMA degradation. Formation of the C150/C157 disulfide bond causes allosteric disruption of a REDD1 degron, blocking CMA and stabilizing REDD1 protein.","method":"Discrete molecular dynamics simulations, site-directed mutagenesis (C150A/C157A and K129), disulfide bond assays, cycloheximide chase, proteasome/lysosome inhibitors, HSC70 co-immunoprecipitation","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structural simulation plus mutagenesis plus Co-IP for chaperone, single lab with multiple orthogonal methods","pmids":["36170669"],"is_preprint":false},{"year":2022,"finding":"REDD1 promotes obesity-induced metabolic inflammation via atypical IKK-independent NF-κB activation by sequestering IκBα from the NF-κB/IκBα complex. Lys219/220 residues of REDD1 are critical for IκBα binding; Lys219/220Ala REDD1 mutant cannot stimulate NF-κB, adipogenesis, or inflammation. Redd1-deficient adipose-derived stem cells lose potential to differentiate into adipocytes, while REDD1 overexpression stimulates preadipocyte differentiation.","method":"Whole-body and adipocyte-specific Redd1 knockout mice, REDD1 Lys219/220Ala knock-in mice, Co-IP for IκBα, NF-κB reporter assays, adipogenesis assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (KO, adipocyte-specific KO, knock-in) with domain mutagenesis validating IκBα binding residues","pmids":["36272977"],"is_preprint":false},{"year":2022,"finding":"Müller glia-specific REDD1 knockout (REDD1-mgKO) mice do not develop diabetes-induced retinal REDD1 upregulation, oxidative stress, gliosis (GFAP), retinal thinning, neurodegeneration, or visual dysfunction. REDD1 in Müller glia is required for the failed adaptive retinal response in diabetes; the gliosis-prevention effect requires the antioxidant transcription factor Nrf2.","method":"Cell-type specific Cre-mediated REDD1 knockout, STZ-induced diabetes, immunohistochemistry, ROS assays, optometry, Nrf2 inhibition","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type specific genetic knockout with multiple orthogonal functional readouts in vivo","pmids":["35167652"],"is_preprint":false},{"year":2023,"finding":"REDD1 promotes diabetes-induced retinal inflammation by promoting GSK3β dephosphorylation at S9 (activation of GSK3β). REDD1 deletion prevents GSK3β dephosphorylation; constitutively active GSK3β restores NF-κB activation in REDD1-deficient cells. GSK3β acts upstream of IKK autophosphorylation and IκB degradation to promote NF-κB signaling and macrophage infiltration.","method":"REDD1 knockout cells and STZ-diabetic mice, constitutively active GSK3β overexpression, GSK3 inhibitor treatment, phospho-GSK3β and IKK assays, macrophage infiltration quantification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological intervention with rescue experiment (constitutively active GSK3β) and in vivo validation","pmids":["37392853"],"is_preprint":false},{"year":2024,"finding":"Disrupted methionine cycle in cancer cachexia leads to DNA hypomethylation of the DDIT4/Redd1 promoter, enabling ATF4-mediated transcriptional upregulation of DDIT4. DNMT3A methylates the Ddit4 promoter; DNMT3A depletion exacerbates cachexia while REDD1 knockout alleviates it. Methionine supplementation restores DNMT3A-dependent DNA methylation of the Ddit4 promoter and inhibits ATF4-mediated Ddit4 transcription.","method":"DNMT3A knockout/overexpression, REDD1 knockout mice, methionine supplementation, chromatin immunoprecipitation, DNA methylation assays, cancer cachexia mouse models","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic models, chromatin assays, and rescue experiments establishing methionine/SAM-DNMT3A/DNA methylation-ATF4/Ddit4 axis","pmids":["39729999"],"is_preprint":false},{"year":2015,"finding":"The transcription factor TAL1/SCL directly represses DDIT4/REDD1 expression in human hematopoietic stem/progenitor cells (HSPCs). TAL1 knockdown increases DDIT4 and reduces mTOR pathway activity; chromatin immunoprecipitation confirmed direct TAL1 binding to the DDiT4 gene. DDIT4 upregulation by TAL1 knockdown reduces HSPC proliferation.","method":"TAL1 knockdown and overexpression, chromatin immunoprecipitation (ChIP) in human HSPCs, gene expression microarrays, mTOR substrate phosphorylation","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct TAL1 binding to DDiT4 locus, supported by functional knockdown/overexpression, single lab","pmids":["25858676"],"is_preprint":false},{"year":2006,"finding":"scylla and charybde, Drosophila homologues of RTP801/DDIT4, are required for embryonic head involution. Both gene products are transcriptionally regulated targets of Dpp/Zen-mediated signal transduction and downstream of homeobox regulation.","method":"Gene disruption in Drosophila, in situ hybridization expression screen, genetic epistasis with dpp/zen signaling","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila genetic knockout with defined developmental phenotype, ortholog-based evidence","pmids":["16423342"],"is_preprint":false},{"year":2021,"finding":"REDD1 promotes cardiomyocyte senescence as a downstream effector of p38 MAPK signaling, promoting NF-κB signaling via p65 phosphorylation and nuclear translocation. Redd1 overexpression accentuates doxorubicin-induced senescence, while AAV9-shRNA-mediated Redd1 silencing alleviates cardiac dysfunction.","method":"AAV9-shRNA knockdown, lentiviral overexpression, p38 MAPK pharmacological inhibition, immunofluorescence, western blotting, in vitro and in vivo doxorubicin models","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological manipulation establishing p38-REDD1-NF-κB pathway, single lab","pmids":["33962393"],"is_preprint":false},{"year":2022,"finding":"PERK/ATF4 signaling axis is required for REDD1 induction in cardiomyocytes under hyperglycemic/hyperlipidemic conditions. REDD1 deletion reduces proinflammatory cytokine expression (IL-1β, IL-6, TNFα) in cardiomyocytes and in hearts of obese mice. Pharmacological PERK inhibition or ATF4 knockdown prevents the REDD1 increase.","method":"PERK inhibitor, ATF4 siRNA knockdown, REDD1 knockout cardiomyocytes and mice, high-fat high-sucrose diet model, cytokine expression assays","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic inhibition establishing PERK/ATF4 upstream of REDD1, and REDD1 deletion showing functional consequences, single lab","pmids":["36383638"],"is_preprint":false},{"year":2021,"finding":"REDD1 mediates motor-learning dysfunction in Huntington's disease by affecting striatal synaptic plasticity. Mhtt-induced RTP801 is elevated in synapses of cultured neurons, HD patient striata, and mouse models. AAV-shRNA knockdown of striatal RTP801 in R6/1 mice prevents motor-learning impairment, normalizes Ser473 Akt hyperphosphorylation by downregulating Rictor, and induces synaptic elevation of GluA1 and TrkB.","method":"AAV-shRNA striatal knockdown in R6/1 mice, synaptosomal fractionation, western blot, motor learning tests, human postmortem HD brain samples","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo AAV knockdown with defined motor phenotype rescue plus mechanistic pathway (Rictor/Akt) and human brain validation","pmids":["32732871"],"is_preprint":false},{"year":2021,"finding":"RTP801/REDD1 contributes to neuroinflammation and memory impairments in Alzheimer's disease. RTP801 levels in hippocampus correlate with Braak and Thal staging and with GFAP expression. AAV-shRNA knockdown of RTP801 in 5xFAD mouse hippocampal neurons ameliorates cognitive deficits and recovers gliosis hallmarks and inflammasome key proteins.","method":"AAV-shRNA hippocampal knockdown in 5xFAD mice, postmortem human AD hippocampal samples, cognitive tests, GFAP and inflammasome protein quantification","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo AAV knockdown with defined cognitive phenotype rescue and neuroinflammation readouts, human tissue validation","pmids":["34131105"],"is_preprint":false},{"year":2018,"finding":"REDD1 inhibits mTORC1 by activating the TSC1/2 complex and confers therapy resistance in glioblastoma. DDIT4 gene suppression sensitizes glioma cells to hypoxia-induced cell death and to temozolomide and radiotherapy, while DDIT4 induction (via doxycycline-regulated system) confers protection from these treatments. An intact DDIT4-mTORC1 signaling axis was demonstrated in human glioblastoma cells.","method":"shRNA-mediated DDIT4 suppression, doxycycline-inducible DDIT4 overexpression, clonogenic survival assays, mTORC1 signaling readouts, hypoxia treatment","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional genetic manipulation with functional readouts, single lab","pmids":["30745581"],"is_preprint":false},{"year":2016,"finding":"REDD1 is involved in inflammation independently of mTORC1 activation. Loss of REDD1 decreases proinflammatory cytokine expression and inhibits p38MAPK, JNK, NF-κB, and NLRP3 inflammasome activation in macrophages, reducing IL-1β secretion. This anti-inflammatory effect of REDD1 deletion is associated with decreased ROS through dysregulation of Nox-1 and GPx3, implicating oxidative stress rather than mTORC1 in this context.","method":"REDD1-/- bone marrow-derived macrophages, LPS/ATP stimulation, REDD1-/- mice, cytokine ELISAs, NLRP3 inflammasome activation, ROS assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout in primary macrophages with multiple inflammatory pathway readouts, single lab","pmids":["28765650"],"is_preprint":false},{"year":2025,"finding":"Podocyte-specific REDD1 is required for NF-κB activation and chemokine expression under hyperglycemic conditions, contributing to macrophage chemotaxis and infiltration. REDD1 deletion in podocytes attenuates diabetic nephropathy markers including albuminuria and NLRP3-mediated caspase-1 activation (pyroptosis). REDD1 expression in podocytes is necessary for diabetes-induced pro-inflammatory immune cell infiltration in kidneys.","method":"Podocyte-specific REDD1 knockout mice, STZ-induced diabetes, NF-κB activity assays, NLRP3/caspase-1 assays, macrophage chemotaxis assays, LDH release","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type specific genetic knockout with multiple mechanistic readouts in vitro and in vivo","pmids":["39920111"],"is_preprint":false}],"current_model":"DDIT4/REDD1/RTP801 is a stress-inducible protein that inhibits mTORC1 by stabilizing the TSC1-TSC2 complex downstream of AKT, thereby suppressing cell growth and protein synthesis; it also promotes or suppresses inflammatory signaling through atypical NF-κB activation (by sequestering IκBα) and IKK-dependent canonical NF-κB sustenance, regulates ROS via a disulfide redox switch (C150/C157) that controls chaperone-mediated autophagy-dependent degradation, is ubiquitinated for proteasomal degradation by the E3 ligases parkin (K48-linked) and NEDD4 (K63-linked), undergoes GPCR-triggered plasma membrane translocation through a Ca2+/calmodulin pathway, and is transcriptionally induced by HIF-1α, Sp1, C/EBP, Elk-1, and ATF4 in response to hypoxia, DNA damage, glucocorticoids, and metabolic stress—collectively acting as a context-dependent metabolic checkpoint that is neuroprotective in acute stress but pro-apoptotic when chronically elevated in differentiated neurons and other post-mitotic cells."},"narrative":{"mechanistic_narrative":"DDIT4 (REDD1/RTP801) is a stress-inducible protein that acts as a metabolic checkpoint, principally by inhibiting mTORC1 signaling downstream of AKT to restrain cell growth and protein synthesis [PMID:15632201, PMID:16258273]. Mechanistically, it suppresses mTORC1 by stabilizing and activating the TSC1-TSC2 complex, with which it physically interacts [PMID:17005863, PMID:20473305], although context-specific mTORC1 inhibition in skeletal muscle proceeds through an Akt/PRAS40 route independent of TSC2/14-3-3 modulation [PMID:25315696], and a parallel arm engages mTORC2-dependent AKT activation [PMID:34907345]. Its transcription is induced by diverse stresses through a broad set of factors including HIF-1α under hypoxia and insulin signaling [PMID:11884613, PMID:19996311], Sp1 [PMID:15180327], Elk-1 and C/EBPβ in response to oxidative and DNA-damaging stress [PMID:16008523, PMID:15751966], and ATF4 under metabolic stress such as metformin and cachexia, where promoter DNA methylation by DNMT3A gates ATF4 access [PMID:34253170, PMID:39729999]; it is repressed by TAL1 in hematopoietic progenitors [PMID:25858676] and induced via a p53-RFX7 axis [PMID:34907345]. DDIT4 protein abundance is tightly controlled by degradation: parkin directs K48-linked polyubiquitination and NEDD4 directs K63-linked polyubiquitination for proteasomal turnover [PMID:25101677, PMID:27494837], while a redox-sensitive C150/C157 disulfide bond allosterically disrupts a degron to block HSC70-dependent chaperone-mediated autophagy and stabilize the protein under hyperglycemia [PMID:36170669]. Beyond mTORC1, DDIT4 drives NF-κB-dependent inflammation through two routes—atypical sequestration of IκBα via its C-terminal Lys219/220 residues [PMID:29547704, PMID:36272977] and sustained IKK autophosphorylation/K63-ubiquitination acting downstream of GSK3β [PMID:36309088, PMID:37392853]—and amplifies ROS production in feedback loops affecting diabetic tissues and the liver [PMID:31141608, PMID:34310076]. Physiologically, DDIT4 is neuroprotective acutely but pro-death when chronically elevated in post-mitotic neurons, and its elevation contributes to Parkinson's, Huntington's, and Alzheimer's disease pathology, glucocorticoid-induced muscle atrophy and lymphocyte autophagy, peripheral nerve myelination, cortical neurogenesis, tumorigenesis, and inflammatory and diabetic complications across multiple organs [PMID:17005863, PMID:19118169, PMID:21733849, PMID:21368030, PMID:24048858, PMID:32956680, PMID:32732871, PMID:34131105].","teleology":[{"year":2002,"claim":"Established DDIT4 as a hypoxia-inducible gene with opposite, cell-context-dependent effects on survival, framing it as a stress-response regulator of ROS and apoptosis.","evidence":"Tetracycline-repressible overexpression with ROS and viability readouts in dividing and neuron-like cells, plus an in vivo ischemia model","pmids":["11884613"],"confidence":"Medium","gaps":["No molecular target of DDIT4 identified","Mechanism distinguishing protective vs pro-apoptotic outcomes unresolved"]},{"year":2005,"claim":"Defined DDIT4's central molecular function: stress-induced inhibition of mTOR signaling positioned downstream of AKT and upstream of TSC2.","evidence":"Overexpression/knockdown with S6K and 4EBP1 phosphorylation assays and genetic epistasis in mammalian and Drosophila cells","pmids":["15632201","16258273"],"confidence":"High","gaps":["Biochemical mechanism by which REDD1 activates TSC1/TSC2 not resolved","Stoichiometry and direct binding partners within the TSC complex unclear"]},{"year":2004,"claim":"Began mapping the transcriptional control of DDIT4, identifying promoter elements driving stress induction.","evidence":"Promoter deletion/mutation luciferase reporters with Sp1 antisense, Elk-1/C/EBPβ EMSA, and HIF-1α knockdown across hypoxia, arsenite, MMS and insulin stimuli","pmids":["15180327","16008523","15751966","19996311"],"confidence":"Medium","gaps":["Relative contribution of each factor in physiological settings unclear","Combinatorial regulation across stresses not integrated"]},{"year":2006,"claim":"Linked DDIT4 mechanistically to neurodegeneration, showing its TSC2/mTOR-dependent activity drives dopaminergic neuron death in Parkinson's disease.","evidence":"Postmortem PD immunohistochemistry, shRNA knockdown, TSC2 co-immunoprecipitation, and the stress→REDD1→mTOR→p-Akt depletion sequence validated in human tissue","pmids":["17005863","19118169"],"confidence":"High","gaps":["Trigger for sustained DDIT4 elevation in PD neurons unknown","Why feedback Akt dephosphorylation becomes lethal not fully defined"]},{"year":2010,"claim":"Demonstrated in vivo that DDIT4 couples mTOR inhibition to NF-κB-driven oxidative tissue injury, extending its role to inflammatory disease.","evidence":"Rtp801 knockout and forced-expression mice in a cigarette-smoke emphysema model with NF-κB reporters and mTOR readouts, plus human emphysema tissue","pmids":["20473305"],"confidence":"High","gaps":["Direct molecular link between REDD1 and NF-κB not yet defined at this stage","Relationship between mTOR inhibition and NF-κB activation unclear"]},{"year":2011,"claim":"Showed DDIT4 mediates physiological stress and developmental programs beyond pathology, including glucocorticoid-induced autophagy and cortical neurogenesis timing.","evidence":"RNAi and knockout thymocytes with autophagy/mTOR readouts; in utero electroporation knockdown with BrdU and migration phenotyping","pmids":["21733849","21368030"],"confidence":"High","gaps":["Mechanism linking mTOR inhibition to migration/differentiation not detailed","Cell-type determinants of pro-survival vs pro-death outcomes unresolved"]},{"year":2013,"claim":"Revealed post-transcriptional and spatial regulation of DDIT4 itself: an mTORC1-REDD1 stability feedback loop, peripheral myelination control, and Ca2+/calmodulin-driven plasma-membrane translocation as an inactivation mode.","evidence":"Cycloheximide chase with proteasome/E3 knockdowns; Ddit4-null nerve myelination phenotyping; BRET membrane-translocation assays with mTORC1 readouts","pmids":["23717519","24048858","24338366"],"confidence":"Medium","gaps":["E3 ligase responsible for the mTORC1-dependent turnover not identified here","Physiological signals triggering membrane translocation in vivo unknown"]},{"year":2014,"claim":"Identified the E3 ligase parkin as a DDIT4-degrading enzyme and dissected a TSC2-independent muscle atrophy mechanism, clarifying both degradation and context-specific signaling.","evidence":"Reciprocal Co-IP and ubiquitination assays with parkin knockout models and AR-JP patient tissue; REDD1-null mice with dexamethasone-induced atrophy and Akt/PRAS40 analysis","pmids":["25101677","25315696"],"confidence":"High","gaps":["Determinants of TSC2-dependent vs Akt/PRAS40-dependent mTORC1 inhibition unresolved","Whether parkin and other ligases act redundantly unclear"]},{"year":2016,"claim":"Established NEDD4 as a second, K63-specific E3 ligase for DDIT4 and uncovered an mTORC1-independent pro-inflammatory function of REDD1 in macrophages.","evidence":"Cell-free ubiquitination, Co-IP, linkage-specific assays, and double-knockdown epistasis; REDD1-/- BMDMs with NLRP3/cytokine and ROS readouts","pmids":["27494837","28765650"],"confidence":"Medium","gaps":["Distinct functional consequences of K48 vs K63 ubiquitination not separated","Whether inflammatory ROS effects are upstream or downstream of mTOR unclear"]},{"year":2018,"claim":"Defined the molecular basis of atypical NF-κB activation by DDIT4, mapping a C-terminal IκBα-sequestering domain.","evidence":"Co-IP with domain mapping (aa 178-229), REDD-1 knockout macrophages, NF-κB reporters, and endotoxemia model","pmids":["29547704"],"confidence":"High","gaps":["Structural details of the REDD1–IκBα interface not resolved","Reconciliation with IKK-dependent NF-κB route not yet addressed"]},{"year":2022,"claim":"Resolved DDIT4 redox-dependent stabilization and refined its two NF-κB-activation mechanisms with residue-level and signaling detail, including a GSK3β-IKK arm.","evidence":"Molecular dynamics plus C150/C157 and K129 mutagenesis with HSC70 Co-IP; Lys219/220Ala knock-in mice; REDD1-KO with IKK autophosphorylation/K63-ubiquitination and GSK3β rescue assays in diabetic models","pmids":["36170669","36272977","36309088","37392853"],"confidence":"High","gaps":["Whether IκBα-sequestration and IKK-sustaining mechanisms operate in the same cells unclear","How redox state coordinates with ubiquitin-dependent turnover not integrated"]},{"year":2024,"claim":"Connected DDIT4 transcriptional control to metabolic-epigenetic regulation, showing methionine-cycle-dependent DNA methylation gates ATF4-driven DDIT4 induction in cachexia.","evidence":"DNMT3A and REDD1 knockout mice, ChIP, DNA methylation assays, and methionine supplementation rescue in cancer cachexia models","pmids":["39729999"],"confidence":"High","gaps":["Generality of methylation gating across other DDIT4-inducing stresses unknown","Direct enzymatic effector of DDIT4 in cachectic muscle wasting not defined"]},{"year":null,"claim":"How DDIT4's competing degradation routes (parkin/NEDD4 proteasomal vs HSC70/CMA lysosomal), redox and S-nitrosylation states, and dual mTOR-dependent vs NF-κB/ROS-dependent activities are integrated to produce its opposite (protective vs pathogenic) outcomes in a given cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of how REDD1 engages TSC1/TSC2, IκBα, and IKK","Determinants selecting degradation pathway in a given stress unknown","Mechanism switching neuroprotective vs pro-apoptotic output undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2,3,23]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[18,27]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,26]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[18,25,27,38]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,1,6,24]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6,26]}],"complexes":[],"partners":["TSC2","TSC1","NFKBIA","PARK2","NEDD4","HSPA8","CHUK"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NX09","full_name":"DNA damage-inducible transcript 4 protein","aliases":["HIF-1 responsive protein RTP801","Protein regulated in development and DNA damage response 1","REDD-1"],"length_aa":232,"mass_kda":25.4,"function":"Regulates cell growth, proliferation and survival via inhibition of the activity of the mammalian target of rapamycin complex 1 (mTORC1). Inhibition of mTORC1 is mediated by a pathway that involves DDIT4/REDD1, AKT1, the TSC1-TSC2 complex and the GTPase RHEB. Plays an important role in responses to cellular energy levels and cellular stress, including responses to hypoxia and DNA damage. Regulates p53/TP53-mediated apoptosis in response to DNA damage via its effect on mTORC1 activity. Its role in the response to hypoxia depends on the cell type; it mediates mTORC1 inhibition in fibroblasts and thymocytes, but not in hepatocytes (By similarity). Required for mTORC1-mediated defense against viral protein synthesis and virus replication (By similarity). Inhibits neuronal differentiation and neurite outgrowth mediated by NGF via its effect on mTORC1 activity. Required for normal neuron migration during embryonic brain development. Plays a role in neuronal cell death","subcellular_location":"Mitochondrion; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q9NX09/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DDIT4","classification":"Not Classified","n_dependent_lines":10,"n_total_lines":1208,"dependency_fraction":0.008278145695364239},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DDIT4","total_profiled":1310},"omim":[{"mim_id":"620833","title":"RNA-BINDING MOTIF PROTEIN 33; RBM33","url":"https://www.omim.org/entry/620833"},{"mim_id":"615149","title":"MICRO RNA 495; MIR495","url":"https://www.omim.org/entry/615149"},{"mim_id":"613303","title":"AlkB HOMOLOG 5, RNA DEMETHYLASE; ALKBH5","url":"https://www.omim.org/entry/613303"},{"mim_id":"607729","title":"DNA DAMAGE-INDUCIBLE TRANSCRIPT 4; DDIT4","url":"https://www.omim.org/entry/607729"},{"mim_id":"124092","title":"INTERLEUKIN 10; IL10","url":"https://www.omim.org/entry/124092"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DDIT4"},"hgnc":{"alias_symbol":["RTP801","FLJ20500","REDD-1","REDD1","Dig2"],"prev_symbol":[]},"alphafold":{"accession":"Q9NX09","domains":[{"cath_id":"3.90.470.40","chopping":"85-195_203-230","consensus_level":"high","plddt":87.7576,"start":85,"end":230}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NX09","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NX09-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NX09-F1-predicted_aligned_error_v6.png","plddt_mean":71.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DDIT4","jax_strain_url":"https://www.jax.org/strain/search?query=DDIT4"},"sequence":{"accession":"Q9NX09","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NX09.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NX09/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NX09"}},"corpus_meta":[{"pmid":"11884613","id":"PMC_11884613","title":"Identification of a novel hypoxia-inducible factor 1-responsive gene, RTP801, involved in apoptosis.","date":"2002","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11884613","citation_count":493,"is_preprint":false},{"pmid":"30563869","id":"PMC_30563869","title":"REDD1/autophagy pathway promotes thromboinflammation and fibrosis in human systemic lupus erythematosus (SLE) through NETs decorated with tissue factor (TF) and interleukin-17A (IL-17A).","date":"2018","source":"Annals of the rheumatic diseases","url":"https://pubmed.ncbi.nlm.nih.gov/30563869","citation_count":223,"is_preprint":false},{"pmid":"20473305","id":"PMC_20473305","title":"Rtp801, a suppressor of mTOR signaling, is an essential mediator of cigarette smoke-induced pulmonary injury and emphysema.","date":"2010","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/20473305","citation_count":199,"is_preprint":false},{"pmid":"15632201","id":"PMC_15632201","title":"The stress-inducted proteins RTP801 and RTP801L are negative regulators of the mammalian target of rapamycin pathway.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15632201","citation_count":198,"is_preprint":false},{"pmid":"19118169","id":"PMC_19118169","title":"RTP801 is induced in Parkinson's disease and mediates neuron death by inhibiting Akt phosphorylation/activation.","date":"2008","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19118169","citation_count":194,"is_preprint":false},{"pmid":"17005863","id":"PMC_17005863","title":"RTP801 is elevated in Parkinson brain substantia nigral neurons and mediates death in cellular models of Parkinson's disease by a mechanism involving mammalian target of rapamycin inactivation.","date":"2006","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/17005863","citation_count":153,"is_preprint":false},{"pmid":"12736248","id":"PMC_12736248","title":"Dexamethasone-induced gene 2 (dig2) is a novel pro-survival stress gene induced rapidly by diverse apoptotic signals.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12736248","citation_count":131,"is_preprint":false},{"pmid":"9860980","id":"PMC_9860980","title":"Differential regulation of transcription: repression by unactivated mitogen-activated protein kinase Kss1 requires the Dig1 and Dig2 proteins.","date":"1998","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9860980","citation_count":124,"is_preprint":false},{"pmid":"15452091","id":"PMC_15452091","title":"Inhibition of oxygen-induced retinopathy in RTP801-deficient mice.","date":"2004","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/15452091","citation_count":108,"is_preprint":false},{"pmid":"16258273","id":"PMC_16258273","title":"Growth control under stress: mTOR regulation through the REDD1-TSC pathway.","date":"2005","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/16258273","citation_count":107,"is_preprint":false},{"pmid":"25315696","id":"PMC_25315696","title":"REDD1 deletion prevents dexamethasone-induced skeletal muscle atrophy.","date":"2014","source":"American journal of physiology. 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Its overexpression in dividing cells (MCF7, PC12) protected against hypoxia/glucose deprivation and H2O2-triggered apoptosis by dramatically reducing reactive oxygen species generation, while in non-dividing neuron-like PC12 cells it promoted apoptosis and increased sensitivity to ischemic injury and oxidative stress.\",\n      \"method\": \"Tetracycline-repressible promoter-driven overexpression, ROS measurement, cell viability assays, in vivo ischemic stroke model\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean gain-of-function in multiple cell lines with ROS readout, single lab, no mechanistic target identified\",\n      \"pmids\": [\"11884613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RTP801/REDD1 and its paralog RTP801L/REDD2 are stress-induced inhibitors of mTOR signaling. Both proteins work downstream of AKT and upstream of TSC2 to inhibit mTOR-dependent phosphorylation of S6K and 4EBP1.\",\n      \"method\": \"Overexpression, siRNA knockdown, phosphorylation assays of mTOR substrates (S6K, 4EBP1), epistasis placing REDD1 downstream of AKT and upstream of TSC2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis established with multiple downstream readouts, replicated across multiple subsequent studies\",\n      \"pmids\": [\"15632201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"REDD1 inhibits mTOR signaling through the TSC1/TSC2 complex. REDD1 is essential for mTOR regulation in response to hypoxia and energy stress; cells lacking REDD1 exhibit defective mTOR regulation under these stress signals.\",\n      \"method\": \"Genetic knockout/knockdown, TSC1/2 epistasis, cell size measurements in Drosophila and mammalian cells\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis across multiple organisms, replicated by multiple independent labs\",\n      \"pmids\": [\"16258273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RTP801 protein is elevated in dopaminergic neurons of the substantia nigra in Parkinson's disease. RTP801 overexpression is sufficient to promote neuronal death; its knockdown via shRNA is neuroprotective in cellular PD models. The mechanism involves repression of mTOR kinase activity, and death is inhibited by shRNAs targeting TSC2, a protein with which RTP801 interacts.\",\n      \"method\": \"Immunohistochemistry on postmortem PD brains, shRNA knockdown, overexpression in PC12 cells, co-immunoprecipitation with TSC2, mTOR activity assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP for TSC2 interaction, loss-of-function with defined phenotype, human postmortem validation\",\n      \"pmids\": [\"17005863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RTP801 mediates neuron death in Parkinson's disease models by suppressing mTOR signaling, which in turn reduces phosphorylation and activation of Akt. This sequential mechanism (stress → RTP801 → mTOR inhibition → Akt dephosphorylation → neuronal death) was validated by finding depletion of phospho-Akt (but not total Akt) in postmortem dopaminergic neurons from PD patients.\",\n      \"method\": \"shRNA knockdown of RTP801, 6-OHDA treatment, phospho-Akt measurements, postmortem PD brain immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic pathway established with genetic knockdown plus human validation, sequential mechanism confirmed\",\n      \"pmids\": [\"19118169\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rtp801/REDD1 inhibits mTOR by stabilizing the TSC1-TSC2 inhibitory complex and enhances oxidative stress-dependent cell death. In cigarette smoke-induced lung injury, Rtp801 is both necessary and sufficient for NF-κB activation; Rtp801 knockout mice are protected against acute cigarette smoke-induced lung injury and emphysema, partly via increased mTOR signaling.\",\n      \"method\": \"Rtp801 knockout mice, cigarette smoke exposure model, NF-κB reporter assays, forced lung expression of Rtp801 plasmid, mTOR signaling readouts\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — constitutive knockout and gain-of-function in vivo with multiple orthogonal mechanistic readouts, human emphysema tissue validation\",\n      \"pmids\": [\"20473305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Glucocorticoid-induced elevation of Dig2/RTP801/REDD1 contributes to autophagy induction in lymphocytes by inhibiting mTOR signaling. RNAi-mediated suppression of REDD1 reduces both mTOR inhibition and autophagy in glucocorticoid-treated lymphocytes, and REDD1 knockout thymocytes show similar effects. REDD1-mediated autophagy promotes cell survival under glucocorticoid stress.\",\n      \"method\": \"RNAi knockdown, Rtp801/Redd1 knockout murine thymocytes, autophagy quantification, mTOR activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — both RNAi and genetic knockout with orthogonal autophagy and mTOR readouts in primary cells\",\n      \"pmids\": [\"21733849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RTP801/REDD1 regulates the timing of cortical neurogenesis and neuron migration. RTP801 levels are high in embryonic cortical neuroprogenitors and diminished in newborn neurons. In vivo and in vitro knockdown of RTP801 accelerates cell cycle exit and neuronal differentiation, and disrupts migration of newborn neurons to the cortical plate, causing ectopic localization of mature neurons.\",\n      \"method\": \"In utero electroporation-based shRNA knockdown, in vitro RTP801 overexpression/knockdown, BrdU labeling, immunohistochemistry\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo and in vitro loss- and gain-of-function with defined phenotypic readouts of neurogenesis timing and migration\",\n      \"pmids\": [\"21368030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The hypoxia-inducible transcription of the RTP801 promoter is mediated by an Sp1 binding site in the region between -495 and -446 bp. Co-transfection with antisense Sp1 oligonucleotides reduced hypoxia-induced RTP801 promoter activity.\",\n      \"method\": \"Promoter deletion and mutation analysis, luciferase reporter assays, antisense Sp1 co-transfection\",\n      \"journal\": \"Pharmaceutical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter deletion and point mutation analyses with functional reporter, single lab\",\n      \"pmids\": [\"15180327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Arsenite induces RTP801 transcription through reactive oxygen species, and the transcription factors Elk-1 and C/EBP acting on an arsenic-responsive region between -1057 and -981 bp of the RTP801 promoter. The ERK pathway is partly responsible, and overexpression of Elk-1 and C/EBPβ elevates promoter activity.\",\n      \"method\": \"Promoter deletion/point mutation analysis, luciferase reporter assays, gel mobility-shift assays, antioxidant co-treatment, ERK inhibitor treatment\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutagenesis plus EMSA plus pharmacological inhibitors, single lab\",\n      \"pmids\": [\"16008523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"DNA damaging agent MMS induces RTP801 transcription through Elk-1 and C/EBPβ binding to a critical region between -1057 and -981 bp of the RTP801 promoter in human keratinocytes.\",\n      \"method\": \"Promoter deletion/mutation analysis, luciferase reporter assays, gel mobility-shift assay, anti-C/EBPβ supershift\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutagenesis plus EMSA with antibody supershift, single lab\",\n      \"pmids\": [\"15751966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Insulin stimulates REDD1 expression in adipocytes through a phosphoinositide 3-kinase/mTOR-dependent pathway that requires HIF-1α as the transcription factor mediating REDD1 induction.\",\n      \"method\": \"Insulin stimulation of murine and human adipocytes, PI3K inhibitor treatment, HIF-1 inhibitor (echinomycin), HIF-1α siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition plus genetic knockdown of HIF-1α, single lab\",\n      \"pmids\": [\"19996311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DDIT4/RTP801/REDD1 is expressed in Schwann cells and functions as a sustained negative regulator of PNS myelination. Loss of DDIT4 in Ddit4-null mice results in hypermyelination and enhanced mTORC1 activation in peripheral nerves, demonstrating that DDIT4 inhibits myelination via mTORC1.\",\n      \"method\": \"Ddit4-null mice, in vitro Schwann cell cultures, immunohistochemistry, electron microscopy for myelin thickness, mTORC1 phosphorylation assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined myelination phenotype and mTORC1 mechanistic link in both in vitro and in vivo models\",\n      \"pmids\": [\"24048858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"mTORC1 regulates REDD1 protein stability in a 26S proteasome-dependent manner; inhibition of mTORC1 reduces REDD1 protein stability and expression, while activation of mTORC1 increases REDD1 protein levels, establishing a novel mTORC1-REDD1 feedback loop. REDD1 degradation is not regulated by HUWE1, Cul4a, or other Cullin E3 ubiquitin ligases.\",\n      \"method\": \"mTORC1 inhibitors/activators, cycloheximide chase, proteasome inhibitors, siRNA knockdown of individual E3 ligases\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic manipulation with protein stability readouts, single lab\",\n      \"pmids\": [\"23717519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"REDD1 undergoes plasma membrane translocation triggered by GPCRs through a Ca2+/calmodulin pathway. REDD1's N-terminus and its conserved mTORC1-inhibitory motif are required for this dynamic plasma membrane interaction. Overexpression of REDD1 reduces GPCR-mediated mTORC1 activation, while depletion of endogenous REDD1 unleashes mTORC1 activity, identifying plasma membrane translocation as an inactivation mechanism for REDD1.\",\n      \"method\": \"Bioluminescent resonance energy transfer (BRET)-based plasma membrane localization assay, fluorescent live-imaging, siRNA knockdown, Ca2+/calmodulin pathway inhibitors\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BRET quantitative assay plus functional mTORC1 readouts, single lab with two orthogonal methods\",\n      \"pmids\": [\"24338366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Parkin E3 ligase physically interacts with RTP801 and promotes its poly-ubiquitination and proteasomal degradation. Parkin knockdown elevates RTP801 in neurons; ectopic parkin protects neuronal cells from RTP801-overexpression-induced death by mediating RTP801 degradation. RTP801 is elevated in parkin knockout mouse brains and human fibroblasts from AR-JP patients.\",\n      \"method\": \"Reciprocal co-immunoprecipitation, parkin knockdown/overexpression, ubiquitination assays, parkin knockout mouse brains, human AR-JP patient fibroblasts and postmortem PD brain immunohistochemistry\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ubiquitination assay, genetic models, and human tissue validation across multiple orthogonal approaches\",\n      \"pmids\": [\"25101677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"REDD1 deletion prevents dexamethasone-induced skeletal muscle atrophy in vivo. REDD1-mediated mTORC1 inhibition in skeletal muscle after glucocorticoid treatment is not related to modulation of TSC2/14-3-3 binding but instead involves a mechanism linking REDD1, Akt, and PRAS40.\",\n      \"method\": \"REDD1-null mice, dexamethasone gavage, muscle weight and fiber size measurements, protein synthesis assays, mTORC1 target phosphorylation (S6, 4E-BP1, ULK1), co-immunoprecipitation for TSC2/14-3-3\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with in vivo phenotype plus mechanistic pathway dissection excluding TSC2 mechanism and implicating Akt/PRAS40\",\n      \"pmids\": [\"25315696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NEDD4 E3 ligase polyubiquitinates RTP801 with K63-linked ubiquitin chains and targets it for degradation. NEDD4 and RTP801 interact physically in cells and in a cell-free system. NEDD4 loss of function (as occurs with neurotoxin 6-OHDA treatment) elevates RTP801, and NEDD4 knockdown toxicity in primary cortical neurons is mediated by RTP801 (double knockdown of NEDD4+RTP801 is neuroprotective).\",\n      \"method\": \"Cell-free ubiquitination assay, co-immunoprecipitation, ubiquitin-linkage specificity assays, shRNA knockdown, primary cortical neurons\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cell-free reconstitution of ubiquitination, Co-IP, genetic epistasis with double knockdown, and human PD tissue validation\",\n      \"pmids\": [\"27494837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"REDD-1 promotes NF-κB activation through an atypical IKK-independent mechanism: REDD-1's C-terminal region (amino acids 178-229) interacts with and sequesters IκBα from the NF-κB/IκBα complex, enabling NF-κB activation during the delayed and persistent phases of inflammation. REDD-1 overexpression stimulates NF-κB-dependent inflammation without additional LPS stimulation.\",\n      \"method\": \"Co-immunoprecipitation of REDD-1 with IκBα, C-terminal domain mapping, REDD-1 knockdown/knockout macrophages, NF-κB reporter assays, endotoxemia mouse model\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP domain mapping with functional rescue, genetic knockout in vivo, multiple orthogonal readouts of NF-κB activation\",\n      \"pmids\": [\"29547704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"REDD1/autophagy pathway promotes NETosis in SLE neutrophils. NETosis correlates with increased REDD1 expression, and endothelin-1 (ET-1) and HIF-1α are key mediators of REDD1-driven NET release, as demonstrated by inhibition with bosentan and L-ascorbic acid respectively.\",\n      \"method\": \"Immunofluorescence, immunoblotting, NET quantification, pharmacological inhibition (bosentan, L-ascorbic acid, hydroxychloroquine), primary neutrophil cultures\",\n      \"journal\": \"Annals of the rheumatic diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — pharmacological inhibitors establish upstream mediators of REDD1-driven NETs, single lab\",\n      \"pmids\": [\"30563869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"REDD1 activates a ROS-generating feedback loop in the diabetic retina. Hyperglycemia increases REDD1 expression and ROS. ROS in turn increases REDD1 (antioxidant NAC prevents REDD1 induction). REDD1 attenuates Akt/GSK3 phosphorylation in a REDD1-dependent manner, and in REDD1-deficient cells, dominant-negative Akt or constitutively active GSK3 restores ROS and mitochondrial dysfunction.\",\n      \"method\": \"REDD1-deficient mice, streptozotocin-induced diabetes, NAC antioxidant treatment, H2O2 exogenous ROS, dominant-negative Akt overexpression, constitutively active GSK3β, ROS assays\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout plus dominant-negative constructs, single lab\",\n      \"pmids\": [\"31141608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DDIT4 is expressed in normal gastric chief cells and suppresses mTORC1 during the initial phase of paligenosis (injury-induced metaplasia). Loss of DDIT4 leads to constitutively high mTORC1, causing mitotic entry of cells harboring DNA damage and increased spontaneous tumorigenesis in mice after multiple rounds of paligenosis.\",\n      \"method\": \"DDIT4-deficient mice, CRISPR/Cas9 DDIT4-/- human gastric cells, tamoxifen/MNU mouse models, 5-FU treatment, xenografts, proliferation and DNA damage markers\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout in both mouse and human cells with defined mTORC1 and tumor formation readouts, multiple experimental systems\",\n      \"pmids\": [\"32956680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DDIT4 S-nitrosylation at specific residues promotes assembly of the p38-MAPK signaling complex, driving hepatic ROS production. DDIT4 is a direct transcriptional target of the chromatin remodeler BRG1. S-nitrosylation-deficient DDIT4 fails to restore ROS production; compounds that influence DDIT4 S-nitrosylation (imatinib, nilotinib, nateglinide) attenuate p38-MAPK signaling and liver injury.\",\n      \"method\": \"BRG1 knockout, DDIT4 overexpression/knockdown, S-nitrosylation assays, molecular docking, in vitro and in vivo liver injury models, human liver biopsy correlation\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — S-nitrosylation assay with functional complex assembly readout, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"34310076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"p53 activates DDIT4 expression indirectly through the transcription factor RFX7. DDIT4 is required for p53 to inhibit mTORC2-dependent AKT activation and for RFX7 to inhibit mTORC1. Under physiological nutrient conditions, basal p53-RFX7-DDIT4 activity constrains mTORC1.\",\n      \"method\": \"siRNA knockdown of DDIT4 and RFX7, p53 activation, mTORC1/mTORC2 substrate phosphorylation assays, physiological cell culture media\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown epistasis with mTOR pathway readouts, single lab\",\n      \"pmids\": [\"34907345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ATF4-dependent REDD1 and Sestrin2 expression in response to metformin is required for mTORC1 inhibition, independent of AMPK activation. siRNA knockdown of REDD1 or Sestrin2 reverses metformin-induced mTORC1 inhibition.\",\n      \"method\": \"siRNA knockdown of REDD1 and Sestrin2, western blot for mTORC1 substrates, AMPK inhibitor treatment\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic siRNA knockdown establishing necessity of REDD1 for metformin effect, single lab\",\n      \"pmids\": [\"34253170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"REDD1 promotes NF-κB activation in diabetic retina by sustaining IκB kinase complex (IKK) autophosphorylation and K63-ubiquitination, leading to IκB degradation and NF-κB activation. REDD1 deletion promotes IκB expression and reduces NF-κB DNA-binding activity. REDD1 acts upstream of IκB by enhancing IKK complex autophosphorylation and K63-ubiquitination.\",\n      \"method\": \"REDD1 knockout cells and STZ-diabetic mice, IKK autophosphorylation and K63-ubiquitination assays, IκB expression, NF-κB DNA-binding (EMSA), macrophage infiltration quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic deletion with multiple orthogonal biochemical readouts (ubiquitination, phosphorylation, DNA binding) plus in vivo validation\",\n      \"pmids\": [\"36309088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Hyperglycemic conditions promote a redox-sensitive C150/C157 disulfide bond in REDD1 that inhibits its lysosomal proteolysis via chaperone-mediated autophagy (CMA). REDD1 acetylation at K129 is required for recognition by the cytosolic chaperone HSC70 and CMA degradation. Formation of the C150/C157 disulfide bond causes allosteric disruption of a REDD1 degron, blocking CMA and stabilizing REDD1 protein.\",\n      \"method\": \"Discrete molecular dynamics simulations, site-directed mutagenesis (C150A/C157A and K129), disulfide bond assays, cycloheximide chase, proteasome/lysosome inhibitors, HSC70 co-immunoprecipitation\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structural simulation plus mutagenesis plus Co-IP for chaperone, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"36170669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"REDD1 promotes obesity-induced metabolic inflammation via atypical IKK-independent NF-κB activation by sequestering IκBα from the NF-κB/IκBα complex. Lys219/220 residues of REDD1 are critical for IκBα binding; Lys219/220Ala REDD1 mutant cannot stimulate NF-κB, adipogenesis, or inflammation. Redd1-deficient adipose-derived stem cells lose potential to differentiate into adipocytes, while REDD1 overexpression stimulates preadipocyte differentiation.\",\n      \"method\": \"Whole-body and adipocyte-specific Redd1 knockout mice, REDD1 Lys219/220Ala knock-in mice, Co-IP for IκBα, NF-κB reporter assays, adipogenesis assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (KO, adipocyte-specific KO, knock-in) with domain mutagenesis validating IκBα binding residues\",\n      \"pmids\": [\"36272977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Müller glia-specific REDD1 knockout (REDD1-mgKO) mice do not develop diabetes-induced retinal REDD1 upregulation, oxidative stress, gliosis (GFAP), retinal thinning, neurodegeneration, or visual dysfunction. REDD1 in Müller glia is required for the failed adaptive retinal response in diabetes; the gliosis-prevention effect requires the antioxidant transcription factor Nrf2.\",\n      \"method\": \"Cell-type specific Cre-mediated REDD1 knockout, STZ-induced diabetes, immunohistochemistry, ROS assays, optometry, Nrf2 inhibition\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type specific genetic knockout with multiple orthogonal functional readouts in vivo\",\n      \"pmids\": [\"35167652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"REDD1 promotes diabetes-induced retinal inflammation by promoting GSK3β dephosphorylation at S9 (activation of GSK3β). REDD1 deletion prevents GSK3β dephosphorylation; constitutively active GSK3β restores NF-κB activation in REDD1-deficient cells. GSK3β acts upstream of IKK autophosphorylation and IκB degradation to promote NF-κB signaling and macrophage infiltration.\",\n      \"method\": \"REDD1 knockout cells and STZ-diabetic mice, constitutively active GSK3β overexpression, GSK3 inhibitor treatment, phospho-GSK3β and IKK assays, macrophage infiltration quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological intervention with rescue experiment (constitutively active GSK3β) and in vivo validation\",\n      \"pmids\": [\"37392853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Disrupted methionine cycle in cancer cachexia leads to DNA hypomethylation of the DDIT4/Redd1 promoter, enabling ATF4-mediated transcriptional upregulation of DDIT4. DNMT3A methylates the Ddit4 promoter; DNMT3A depletion exacerbates cachexia while REDD1 knockout alleviates it. Methionine supplementation restores DNMT3A-dependent DNA methylation of the Ddit4 promoter and inhibits ATF4-mediated Ddit4 transcription.\",\n      \"method\": \"DNMT3A knockout/overexpression, REDD1 knockout mice, methionine supplementation, chromatin immunoprecipitation, DNA methylation assays, cancer cachexia mouse models\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic models, chromatin assays, and rescue experiments establishing methionine/SAM-DNMT3A/DNA methylation-ATF4/Ddit4 axis\",\n      \"pmids\": [\"39729999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The transcription factor TAL1/SCL directly represses DDIT4/REDD1 expression in human hematopoietic stem/progenitor cells (HSPCs). TAL1 knockdown increases DDIT4 and reduces mTOR pathway activity; chromatin immunoprecipitation confirmed direct TAL1 binding to the DDiT4 gene. DDIT4 upregulation by TAL1 knockdown reduces HSPC proliferation.\",\n      \"method\": \"TAL1 knockdown and overexpression, chromatin immunoprecipitation (ChIP) in human HSPCs, gene expression microarrays, mTOR substrate phosphorylation\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct TAL1 binding to DDiT4 locus, supported by functional knockdown/overexpression, single lab\",\n      \"pmids\": [\"25858676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"scylla and charybde, Drosophila homologues of RTP801/DDIT4, are required for embryonic head involution. Both gene products are transcriptionally regulated targets of Dpp/Zen-mediated signal transduction and downstream of homeobox regulation.\",\n      \"method\": \"Gene disruption in Drosophila, in situ hybridization expression screen, genetic epistasis with dpp/zen signaling\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila genetic knockout with defined developmental phenotype, ortholog-based evidence\",\n      \"pmids\": [\"16423342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"REDD1 promotes cardiomyocyte senescence as a downstream effector of p38 MAPK signaling, promoting NF-κB signaling via p65 phosphorylation and nuclear translocation. Redd1 overexpression accentuates doxorubicin-induced senescence, while AAV9-shRNA-mediated Redd1 silencing alleviates cardiac dysfunction.\",\n      \"method\": \"AAV9-shRNA knockdown, lentiviral overexpression, p38 MAPK pharmacological inhibition, immunofluorescence, western blotting, in vitro and in vivo doxorubicin models\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological manipulation establishing p38-REDD1-NF-κB pathway, single lab\",\n      \"pmids\": [\"33962393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PERK/ATF4 signaling axis is required for REDD1 induction in cardiomyocytes under hyperglycemic/hyperlipidemic conditions. REDD1 deletion reduces proinflammatory cytokine expression (IL-1β, IL-6, TNFα) in cardiomyocytes and in hearts of obese mice. Pharmacological PERK inhibition or ATF4 knockdown prevents the REDD1 increase.\",\n      \"method\": \"PERK inhibitor, ATF4 siRNA knockdown, REDD1 knockout cardiomyocytes and mice, high-fat high-sucrose diet model, cytokine expression assays\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic inhibition establishing PERK/ATF4 upstream of REDD1, and REDD1 deletion showing functional consequences, single lab\",\n      \"pmids\": [\"36383638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"REDD1 mediates motor-learning dysfunction in Huntington's disease by affecting striatal synaptic plasticity. Mhtt-induced RTP801 is elevated in synapses of cultured neurons, HD patient striata, and mouse models. AAV-shRNA knockdown of striatal RTP801 in R6/1 mice prevents motor-learning impairment, normalizes Ser473 Akt hyperphosphorylation by downregulating Rictor, and induces synaptic elevation of GluA1 and TrkB.\",\n      \"method\": \"AAV-shRNA striatal knockdown in R6/1 mice, synaptosomal fractionation, western blot, motor learning tests, human postmortem HD brain samples\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo AAV knockdown with defined motor phenotype rescue plus mechanistic pathway (Rictor/Akt) and human brain validation\",\n      \"pmids\": [\"32732871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RTP801/REDD1 contributes to neuroinflammation and memory impairments in Alzheimer's disease. RTP801 levels in hippocampus correlate with Braak and Thal staging and with GFAP expression. AAV-shRNA knockdown of RTP801 in 5xFAD mouse hippocampal neurons ameliorates cognitive deficits and recovers gliosis hallmarks and inflammasome key proteins.\",\n      \"method\": \"AAV-shRNA hippocampal knockdown in 5xFAD mice, postmortem human AD hippocampal samples, cognitive tests, GFAP and inflammasome protein quantification\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo AAV knockdown with defined cognitive phenotype rescue and neuroinflammation readouts, human tissue validation\",\n      \"pmids\": [\"34131105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"REDD1 inhibits mTORC1 by activating the TSC1/2 complex and confers therapy resistance in glioblastoma. DDIT4 gene suppression sensitizes glioma cells to hypoxia-induced cell death and to temozolomide and radiotherapy, while DDIT4 induction (via doxycycline-regulated system) confers protection from these treatments. An intact DDIT4-mTORC1 signaling axis was demonstrated in human glioblastoma cells.\",\n      \"method\": \"shRNA-mediated DDIT4 suppression, doxycycline-inducible DDIT4 overexpression, clonogenic survival assays, mTORC1 signaling readouts, hypoxia treatment\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional genetic manipulation with functional readouts, single lab\",\n      \"pmids\": [\"30745581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"REDD1 is involved in inflammation independently of mTORC1 activation. Loss of REDD1 decreases proinflammatory cytokine expression and inhibits p38MAPK, JNK, NF-κB, and NLRP3 inflammasome activation in macrophages, reducing IL-1β secretion. This anti-inflammatory effect of REDD1 deletion is associated with decreased ROS through dysregulation of Nox-1 and GPx3, implicating oxidative stress rather than mTORC1 in this context.\",\n      \"method\": \"REDD1-/- bone marrow-derived macrophages, LPS/ATP stimulation, REDD1-/- mice, cytokine ELISAs, NLRP3 inflammasome activation, ROS assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout in primary macrophages with multiple inflammatory pathway readouts, single lab\",\n      \"pmids\": [\"28765650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Podocyte-specific REDD1 is required for NF-κB activation and chemokine expression under hyperglycemic conditions, contributing to macrophage chemotaxis and infiltration. REDD1 deletion in podocytes attenuates diabetic nephropathy markers including albuminuria and NLRP3-mediated caspase-1 activation (pyroptosis). REDD1 expression in podocytes is necessary for diabetes-induced pro-inflammatory immune cell infiltration in kidneys.\",\n      \"method\": \"Podocyte-specific REDD1 knockout mice, STZ-induced diabetes, NF-κB activity assays, NLRP3/caspase-1 assays, macrophage chemotaxis assays, LDH release\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type specific genetic knockout with multiple mechanistic readouts in vitro and in vivo\",\n      \"pmids\": [\"39920111\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DDIT4/REDD1/RTP801 is a stress-inducible protein that inhibits mTORC1 by stabilizing the TSC1-TSC2 complex downstream of AKT, thereby suppressing cell growth and protein synthesis; it also promotes or suppresses inflammatory signaling through atypical NF-κB activation (by sequestering IκBα) and IKK-dependent canonical NF-κB sustenance, regulates ROS via a disulfide redox switch (C150/C157) that controls chaperone-mediated autophagy-dependent degradation, is ubiquitinated for proteasomal degradation by the E3 ligases parkin (K48-linked) and NEDD4 (K63-linked), undergoes GPCR-triggered plasma membrane translocation through a Ca2+/calmodulin pathway, and is transcriptionally induced by HIF-1α, Sp1, C/EBP, Elk-1, and ATF4 in response to hypoxia, DNA damage, glucocorticoids, and metabolic stress—collectively acting as a context-dependent metabolic checkpoint that is neuroprotective in acute stress but pro-apoptotic when chronically elevated in differentiated neurons and other post-mitotic cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DDIT4 (REDD1/RTP801) is a stress-inducible protein that acts as a metabolic checkpoint, principally by inhibiting mTORC1 signaling downstream of AKT to restrain cell growth and protein synthesis [#1, #2]. Mechanistically, it suppresses mTORC1 by stabilizing and activating the TSC1-TSC2 complex, with which it physically interacts [#3, #5], although context-specific mTORC1 inhibition in skeletal muscle proceeds through an Akt/PRAS40 route independent of TSC2/14-3-3 modulation [#16], and a parallel arm engages mTORC2-dependent AKT activation [#23]. Its transcription is induced by diverse stresses through a broad set of factors including HIF-1\\u03b1 under hypoxia and insulin signaling [#0, #11], Sp1 [#8], Elk-1 and C/EBP\\u03b2 in response to oxidative and DNA-damaging stress [#9, #10], and ATF4 under metabolic stress such as metformin and cachexia, where promoter DNA methylation by DNMT3A gates ATF4 access [#24, #30]; it is repressed by TAL1 in hematopoietic progenitors [#31] and induced via a p53-RFX7 axis [#23]. DDIT4 protein abundance is tightly controlled by degradation: parkin directs K48-linked polyubiquitination and NEDD4 directs K63-linked polyubiquitination for proteasomal turnover [#15, #17], while a redox-sensitive C150/C157 disulfide bond allosterically disrupts a degron to block HSC70-dependent chaperone-mediated autophagy and stabilize the protein under hyperglycemia [#26]. Beyond mTORC1, DDIT4 drives NF-\\u03baB-dependent inflammation through two routes\\u2014atypical sequestration of I\\u03baB\\u03b1 via its C-terminal Lys219/220 residues [#18, #27] and sustained IKK autophosphorylation/K63-ubiquitination acting downstream of GSK3\\u03b2 [#25, #29]\\u2014and amplifies ROS production in feedback loops affecting diabetic tissues and the liver [#20, #22]. Physiologically, DDIT4 is neuroprotective acutely but pro-death when chronically elevated in post-mitotic neurons, and its elevation contributes to Parkinson's, Huntington's, and Alzheimer's disease pathology, glucocorticoid-induced muscle atrophy and lymphocyte autophagy, peripheral nerve myelination, cortical neurogenesis, tumorigenesis, and inflammatory and diabetic complications across multiple organs [#3, #4, #6, #7, #12, #21, #35, #36].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established DDIT4 as a hypoxia-inducible gene with opposite, cell-context-dependent effects on survival, framing it as a stress-response regulator of ROS and apoptosis.\",\n      \"evidence\": \"Tetracycline-repressible overexpression with ROS and viability readouts in dividing and neuron-like cells, plus an in vivo ischemia model\",\n      \"pmids\": [\"11884613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular target of DDIT4 identified\", \"Mechanism distinguishing protective vs pro-apoptotic outcomes unresolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined DDIT4's central molecular function: stress-induced inhibition of mTOR signaling positioned downstream of AKT and upstream of TSC2.\",\n      \"evidence\": \"Overexpression/knockdown with S6K and 4EBP1 phosphorylation assays and genetic epistasis in mammalian and Drosophila cells\",\n      \"pmids\": [\"15632201\", \"16258273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical mechanism by which REDD1 activates TSC1/TSC2 not resolved\", \"Stoichiometry and direct binding partners within the TSC complex unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Began mapping the transcriptional control of DDIT4, identifying promoter elements driving stress induction.\",\n      \"evidence\": \"Promoter deletion/mutation luciferase reporters with Sp1 antisense, Elk-1/C/EBP\\u03b2 EMSA, and HIF-1\\u03b1 knockdown across hypoxia, arsenite, MMS and insulin stimuli\",\n      \"pmids\": [\"15180327\", \"16008523\", \"15751966\", \"19996311\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of each factor in physiological settings unclear\", \"Combinatorial regulation across stresses not integrated\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked DDIT4 mechanistically to neurodegeneration, showing its TSC2/mTOR-dependent activity drives dopaminergic neuron death in Parkinson's disease.\",\n      \"evidence\": \"Postmortem PD immunohistochemistry, shRNA knockdown, TSC2 co-immunoprecipitation, and the stress\\u2192REDD1\\u2192mTOR\\u2192p-Akt depletion sequence validated in human tissue\",\n      \"pmids\": [\"17005863\", \"19118169\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger for sustained DDIT4 elevation in PD neurons unknown\", \"Why feedback Akt dephosphorylation becomes lethal not fully defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated in vivo that DDIT4 couples mTOR inhibition to NF-\\u03baB-driven oxidative tissue injury, extending its role to inflammatory disease.\",\n      \"evidence\": \"Rtp801 knockout and forced-expression mice in a cigarette-smoke emphysema model with NF-\\u03baB reporters and mTOR readouts, plus human emphysema tissue\",\n      \"pmids\": [\"20473305\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between REDD1 and NF-\\u03baB not yet defined at this stage\", \"Relationship between mTOR inhibition and NF-\\u03baB activation unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed DDIT4 mediates physiological stress and developmental programs beyond pathology, including glucocorticoid-induced autophagy and cortical neurogenesis timing.\",\n      \"evidence\": \"RNAi and knockout thymocytes with autophagy/mTOR readouts; in utero electroporation knockdown with BrdU and migration phenotyping\",\n      \"pmids\": [\"21733849\", \"21368030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking mTOR inhibition to migration/differentiation not detailed\", \"Cell-type determinants of pro-survival vs pro-death outcomes unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed post-transcriptional and spatial regulation of DDIT4 itself: an mTORC1-REDD1 stability feedback loop, peripheral myelination control, and Ca2+/calmodulin-driven plasma-membrane translocation as an inactivation mode.\",\n      \"evidence\": \"Cycloheximide chase with proteasome/E3 knockdowns; Ddit4-null nerve myelination phenotyping; BRET membrane-translocation assays with mTORC1 readouts\",\n      \"pmids\": [\"23717519\", \"24048858\", \"24338366\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase responsible for the mTORC1-dependent turnover not identified here\", \"Physiological signals triggering membrane translocation in vivo unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified the E3 ligase parkin as a DDIT4-degrading enzyme and dissected a TSC2-independent muscle atrophy mechanism, clarifying both degradation and context-specific signaling.\",\n      \"evidence\": \"Reciprocal Co-IP and ubiquitination assays with parkin knockout models and AR-JP patient tissue; REDD1-null mice with dexamethasone-induced atrophy and Akt/PRAS40 analysis\",\n      \"pmids\": [\"25101677\", \"25315696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of TSC2-dependent vs Akt/PRAS40-dependent mTORC1 inhibition unresolved\", \"Whether parkin and other ligases act redundantly unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established NEDD4 as a second, K63-specific E3 ligase for DDIT4 and uncovered an mTORC1-independent pro-inflammatory function of REDD1 in macrophages.\",\n      \"evidence\": \"Cell-free ubiquitination, Co-IP, linkage-specific assays, and double-knockdown epistasis; REDD1-/- BMDMs with NLRP3/cytokine and ROS readouts\",\n      \"pmids\": [\"27494837\", \"28765650\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Distinct functional consequences of K48 vs K63 ubiquitination not separated\", \"Whether inflammatory ROS effects are upstream or downstream of mTOR unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the molecular basis of atypical NF-\\u03baB activation by DDIT4, mapping a C-terminal I\\u03baB\\u03b1-sequestering domain.\",\n      \"evidence\": \"Co-IP with domain mapping (aa 178-229), REDD-1 knockout macrophages, NF-\\u03baB reporters, and endotoxemia model\",\n      \"pmids\": [\"29547704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural details of the REDD1\\u2013I\\u03baB\\u03b1 interface not resolved\", \"Reconciliation with IKK-dependent NF-\\u03baB route not yet addressed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved DDIT4 redox-dependent stabilization and refined its two NF-\\u03baB-activation mechanisms with residue-level and signaling detail, including a GSK3\\u03b2-IKK arm.\",\n      \"evidence\": \"Molecular dynamics plus C150/C157 and K129 mutagenesis with HSC70 Co-IP; Lys219/220Ala knock-in mice; REDD1-KO with IKK autophosphorylation/K63-ubiquitination and GSK3\\u03b2 rescue assays in diabetic models\",\n      \"pmids\": [\"36170669\", \"36272977\", \"36309088\", \"37392853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether I\\u03baB\\u03b1-sequestration and IKK-sustaining mechanisms operate in the same cells unclear\", \"How redox state coordinates with ubiquitin-dependent turnover not integrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected DDIT4 transcriptional control to metabolic-epigenetic regulation, showing methionine-cycle-dependent DNA methylation gates ATF4-driven DDIT4 induction in cachexia.\",\n      \"evidence\": \"DNMT3A and REDD1 knockout mice, ChIP, DNA methylation assays, and methionine supplementation rescue in cancer cachexia models\",\n      \"pmids\": [\"39729999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of methylation gating across other DDIT4-inducing stresses unknown\", \"Direct enzymatic effector of DDIT4 in cachectic muscle wasting not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DDIT4's competing degradation routes (parkin/NEDD4 proteasomal vs HSC70/CMA lysosomal), redox and S-nitrosylation states, and dual mTOR-dependent vs NF-\\u03baB/ROS-dependent activities are integrated to produce its opposite (protective vs pathogenic) outcomes in a given cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of how REDD1 engages TSC1/TSC2, I\\u03baB\\u03b1, and IKK\", \"Determinants selecting degradation pathway in a given stress unknown\", \"Mechanism switching neuroprotective vs pro-apoptotic output undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2, 3, 23]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [18, 27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 26]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-165159\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [18, 25, 27, 38]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 1, 6, 24]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TSC2\", \"TSC1\", \"NFKBIA\", \"PARK2\", \"NEDD4\", \"HSPA8\", \"CHUK\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}