{"gene":"MADD","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1997,"finding":"MADD associates with the death domain of TNFR1 through its own C-terminal death domain, co-immunoprecipitates with TNFR1, and overexpression of MADD activates ERK MAP kinase; expression of the MADD death domain stimulates both ERK and JNK MAP kinases and induces phosphorylation of cytosolic phospholipase A2.","method":"Yeast two-hybrid, co-immunoprecipitation, overexpression assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus yeast interaction trap plus functional overexpression assays; foundational paper replicated by multiple subsequent studies","pmids":["9115275"],"is_preprint":false},{"year":2001,"finding":"IG20 and DENN-SV (splice variants of the same gene as MADD) exert opposing effects on TNF-alpha-induced apoptosis: IG20 enhances caspase-8 and caspase-3 activation and renders cells more susceptible to apoptosis, while DENN-SV reduces caspase activation and confers resistance. All variants interact with TNFR1 and activate ERK and NF-kappaB.","method":"Stable transfection of HeLa cells, caspase activity assays, co-immunoprecipitation, flow cytometry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal functional assays in stably transfected cells, replicated across subsequent studies from multiple labs","pmids":["11577081"],"is_preprint":false},{"year":2004,"finding":"DENN/MADD and TRADD competitively bind to TNFR1; overexpressed DENN/MADD abrogates TNFR1 binding to TRADD. Antisense knockdown of DENN/MADD in rat hippocampal neurons reduces endogenous DENN/MADD and promotes neuronal cell death.","method":"Overexpression in N2A cells, co-immunoprecipitation, antisense oligonucleotide knockdown in primary cultures, immunohistochemistry","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP competition assay plus antisense KD with cell death phenotype, single lab","pmids":["15007167"],"is_preprint":false},{"year":2004,"finding":"IG20 (proapoptotic splice variant of MADD/IG20 gene) interacts with TRAIL death receptors DR4 and DR5 and increases recruitment of FADD and caspase-8 into the TRAIL DISC, thereby enhancing TRAIL-induced apoptosis.","method":"Colocalization imaging, co-immunoprecipitation, dominant-negative FADD expression, caspase inhibitor experiments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional rescue with DN-FADD and caspase inhibitors, single lab","pmids":["15208670"],"is_preprint":false},{"year":2006,"finding":"Selective knockdown of the MADD splice variant (using exon-specific shRNAs) results in spontaneous apoptosis of cancer cells; re-expression of MADD alone (without other IG20 isoforms) is sufficient to rescue cells from apoptosis, demonstrating MADD is necessary and sufficient for cancer cell survival.","method":"Exon-specific shRNA knockdown, lentiviral delivery, rescue re-expression, flow cytometry apoptosis assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — selective isoform-specific KD with rescue experiment, multiple cell lines, rigorous controls","pmids":["16682944"],"is_preprint":false},{"year":2007,"finding":"MADD directly interacts with death receptors (DR4/DR5) but not with caspase-8 or FADD, and functions as a negative regulator of caspase-8 activation at death receptors. Knockdown of MADD leads to caspase-8 activation at death receptors and sensitizes cancer cells to TRAIL-induced apoptosis.","method":"Immunoprecipitation, shRNA knockdown, caspase-8 activation assays, CrmA and DN-FADD rescue experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assay (negative for caspase-8/FADD), shRNA KD with functional readout, multiple rescue controls","pmids":["17314102"],"is_preprint":false},{"year":2008,"finding":"DENN/MADD (Rab3-GEP) directly interacts with the stalk domain of KIF1Bbeta and KIF1A motors and preferentially binds GTP-Rab3 (acting as a Rab3 effector). Sequential genetic perturbations showed KIF1Bbeta/KIF1A are required for transport of DENN/MADD and Rab3, and DENN/MADD is essential for axonal transport of Rab3. GTP-Rab3 is more efficiently transported than GDP-Rab3.","method":"Co-immunoprecipitation, direct binding assays, genetic knockouts (sequential), live imaging of axonal transport","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis with multiple knockouts, direct binding, functional transport assays; published in high-quality journal","pmids":["18849981"],"is_preprint":false},{"year":2009,"finding":"Endogenous MADD is specifically required for TNF-alpha-induced activation of MAPK/ERK (but not JNK, p38, or NF-kappaB, and not EGF-induced MAPK activation). MADD loss reduces Grb2 and Sos1/2 recruitment to the TNFR1 complex and decreases Ras and MEKK1/2 activation. Re-expression of shRNA-resistant MADD rescues cells from TNF-alpha-induced apoptosis.","method":"Exon-specific shRNA knockdown, kinase activation assays (ERK, JNK, p38), NF-kappaB reporter assays, TNFR1 complex immunoprecipitation, rescue re-expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-selective KD with rescue, multiple pathway readouts, Co-IP of signaling complex, single lab but multiple orthogonal methods","pmids":["19289468"],"is_preprint":false},{"year":2010,"finding":"MADD is phosphorylated at three conserved sites by Akt; only phosphorylated MADD directly interacts with TRAIL receptor DR4, preventing FADD recruitment. TRAIL induces reduction in MADD phosphorylation in susceptible cells, causing MADD dissociation from DR4 and allowing DISC formation. In TRAIL-resistant cells, MADD phosphorylation is maintained.","method":"Phosphorylation assays, co-immunoprecipitation, dominant-negative Akt expression, PI3K inhibitor (LY294002), Western blotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — phosphorylation site identification, direct binding assays, dominant-negative and pharmacological inhibition, multiple cell lines","pmids":["20484047"],"is_preprint":false},{"year":2010,"finding":"MADD activates Rab27A and Rab27B as a DENN-domain GDP/GTP exchange factor, as demonstrated in a systematic characterization of 17 human DENN domain proteins; MADD-specific GEF activity toward Rab27A/27B was established in this family-wide study.","method":"GEF activity assays, Rab-GTP loading assays, localization studies across DENN family members","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro GEF activity assays, systematic family-wide characterization with multiple orthogonal methods, replicated in subsequent studies","pmids":["20937701"],"is_preprint":false},{"year":2013,"finding":"MADD/DENN/Rab3GEP functions as a GEF for Rab27 in rat parotid acinar cells: an antibody against the C-terminal 150 amino acids of MADD inhibited isoproterenol-induced amylase release and reduced GTP-Rab27 levels in permeabilized cells, indicating MADD's GEF activity for Rab27 is required for regulated exocytosis.","method":"Antibody microinjection into streptolysin O-permeabilized acinar cells, Rab27-GTP pull-down assay, amylase release assay, RT-PCR","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional inhibition with specific antibody plus GTP-loading assay, single lab","pmids":["23702376"],"is_preprint":false},{"year":2013,"finding":"Conditional knockout of IG20/MADD in pancreatic beta-cells results in hyperglycemia and glucose intolerance due to a severe defect in glucose-induced insulin release (not insulin processing), with increased insulin accumulation in beta-cells.","method":"Conditional knockout mouse model (KMA1ko), glucose tolerance tests, insulin secretion assays, insulin processing analysis, immunostaining","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with specific cellular phenotype (secretion defect, not processing), multiple functional readouts","pmids":["24379354"],"is_preprint":false},{"year":2014,"finding":"PTEN upregulation reduces MADD phosphorylation by Akt; non-phosphorylated MADD translocates from the plasma membrane to the cytoplasm where it binds 14-3-3, displacing Bax which then translocates to mitochondria causing cytochrome c release and apoptosis. PTEN siRNA knockdown prevents TRAIL-induced reduction in phospho-MADD.","method":"siRNA knockdown, Western blotting, subcellular fractionation, co-immunoprecipitation, cytochrome c release assay","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular fractionation showing localization change, Co-IP of MADD-14-3-3-Bax interactions, siRNA knockdown, single lab","pmids":["24038283"],"is_preprint":false},{"year":2021,"finding":"MADD acts as the GEF for Rab27A, Rab3B, and Rab3D in primary human endothelial cells, driving their activation and recruitment to Weibel-Palade bodies (WPBs). MADD silencing reduces GTP-Rab27A, Rab3B, and Rab3D levels, decreases Rab localization to WPBs, and impairs histamine-evoked VWF release. The DENN domain of MADD is required for Rab activation but not binding. Cytosolic localization of MADD is essential for WPB targeting of Rabs.","method":"siRNA knockdown, Rab activity (GTP-pull-down) assays, DENN-domain mutant constructs, TOMM70 mistargeting experiment, immunofluorescence, VWF secretion assay","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — GEF activity assays, domain mutant analysis, mistargeting experiment, multiple Rab substrates, functional secretion readout","pmids":["34551092"],"is_preprint":false},{"year":2024,"finding":"Patient-derived endothelial cells (ECFCs) with biallelic MADD variants lack MADD protein, show reduced Rab27A and Rab3D activity and their failure to localize to WPBs, and have significantly reduced histamine-induced VWF and VWF propeptide secretion due to delayed and reduced WPB degranulation, establishing MADD as required for WPB secretion competence.","method":"Patient-derived ECFC isolation, proteomics, Rab activity assays, live-cell imaging of WPB exocytosis, VWF secretion assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — patient-derived cells with biallelic loss-of-function variants, proteomics, live imaging, multiple functional secretion readouts; corroborates prior mechanistic studies","pmids":["40668965"],"is_preprint":false},{"year":2024,"finding":"MADD knockout significantly decreases GTP-bound Rab27a in NK cells and CD8+ T cells; MADD-deficient cytotoxic lymphocytes show severely reduced degranulation and cytolytic ability similar to Rab27a-deficient cells. MADD colocalizes with Rab27a on lytic granules and is enriched at the cytolytic synapse, but loss of MADD does not affect Rab27a association with lytic granules or their recruitment to the synapse.","method":"CRISPR knockout, Rab27a-GTP pull-down assay, degranulation assays (CD107a), cytotoxicity assays, confocal imaging","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO with GTP-loading assay, functional cytotoxicity readout, confocal localization, mechanistically distinguishes activation from trafficking steps","pmids":["38506245"],"is_preprint":false},{"year":2005,"finding":"Recombinant Rab3 GEP (DENN/MADD) is active as a GEF on lipid-modified Rab3A, Rab3B, Rab3C, and Rab3D but is inactive on lipid-unmodified Rab3A or Rab3A complexed with Rab GDI. Overexpression of Rab3 GEP inhibits Ca2+-dependent exocytosis from PC12 cells.","method":"Biochemical purification of recombinant protein from Sf9 cells, in vitro GEF activity assay, human growth hormone co-expression exocytosis assay in PC12 cells","journal":"Methods in enzymology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted GEF assay with substrate specificity characterization, functional exocytosis assay; single lab but rigorous biochemical methods","pmids":["16473592"],"is_preprint":false},{"year":2020,"finding":"Patient-derived fibroblasts with biallelic MADD variants show reduced phosphorylation of ERK1/2 upon TNF-alpha treatment, enhanced activation of caspase-3 and -7, increased apoptosis, and a defect in endocytosis of epidermal growth factor, demonstrating that MADD deficiency causes multiple cellular defects in TNF-alpha signaling and vesicular trafficking.","method":"Patient-derived fibroblast functional assays, Western blotting for pERK1/2, caspase activation assays, EGF endocytosis assay, mRNA/protein quantification","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived cells with biallelic variants, multiple orthogonal functional assays across two distinct pathways","pmids":["32761064"],"is_preprint":false},{"year":2024,"finding":"Nucleolin lactylated at K477 by P300 (in response to glycolysis) binds the primary transcript of MADD and promotes efficient MADD translation by circumventing alternative splicing that generates a premature termination codon; lactylated NCL upregulates MADD expression and activates downstream ERK signaling.","method":"Mass spectrometry, macromolecule interaction assays, RNA splicing analysis, xenograft tumor model, Western blotting, siRNA knockdown","journal":"Journal of hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry identification of lactylation site, functional splicing assay, in vivo xenograft validation; single lab","pmids":["38679071"],"is_preprint":false},{"year":2023,"finding":"CaSR activation drives Rab11A-dependent coupling of recycling endosomes to secretory vesicles via endosomal PI3K-mediated activation of a MADD/Rab27B pathway. Rab11A physically interacts with and activates MADD (GEF for Rab3 and Rab27A/B), linking endocytic and secretory pathways.","method":"Co-immunoprecipitation, Rab activity assays, PI3K inhibitors, siRNA knockdown, cytokine secretion assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of Rab11A-MADD interaction, Rab activity assays, pharmacological and siRNA perturbation; single lab","pmids":["37604243"],"is_preprint":false},{"year":2024,"finding":"A splice site variant in MADD causing skipping of exon 30 (in-frame deletion of 36 amino acids) reduces insulin content and increases proinsulin-to-insulin ratio in stem cell-derived pancreatic islets, and decreases luteinizing hormone expression in gonadotrope cells; the GDP/GTP exchange activity of dex30 MADD remains intact, suggesting the endocrine phenotype arises through altered protein-protein interactions rather than loss of GEF catalytic function.","method":"Human embryonic stem cell-derived pancreatic islets, CRISPR-engineered dex30 cell lines, insulin/proinsulin ELISA, LH expression assay, protein-protein interaction proteomics, GEF activity assay","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — GEF activity biochemical assay plus stem-cell-derived functional models, single lab","pmids":["38775154"],"is_preprint":false},{"year":1996,"finding":"The DENN protein (identical to MADD) localizes predominantly to the cell membrane with some cytoplasmic staining as determined by immunofluorescent labeling of human cells with polyclonal antibodies, and was identified as a 140–145 kDa protein on Western blots.","method":"Immunofluorescence, Western blotting with polyclonal antisera","journal":"DNA sequence : the journal of DNA sequencing and mapping","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single immunofluorescence localization study with no functional consequence linked","pmids":["8988362"],"is_preprint":false}],"current_model":"MADD is a multifunctional scaffold protein that acts as a DENN-domain GDP/GTP exchange factor (GEF) for Rab3 subfamily members and Rab27A/B, activating these GTPases on secretory vesicles (synaptic vesicle precursors, Weibel-Palade bodies, lytic granules, and secretory granules) to regulate Ca2+-dependent exocytosis and vesicle trafficking; it also associates with the death domain of TNFR1 through its own C-terminal death domain and couples TNFR1 to ERK/MAPK activation via Grb2/Sos1/2 recruitment, while simultaneously protecting cells from apoptosis by directly binding death receptors DR4/DR5 to prevent FADD and caspase-8 recruitment—a pro-survival function that is dependent on Akt-mediated phosphorylation of MADD at three conserved sites, since dephosphorylated MADD relocates to the cytoplasm to displace Bax from 14-3-3, triggering the mitochondrial apoptotic pathway; KIF1Bbeta and KIF1A motors transport DENN/MADD and its GTP-Rab3 cargo down axons in a nucleotide-state-dependent manner; and alternative splicing of the IG20/MADD locus generates isoforms with opposing pro-survival (MADD/DENN-SV) and pro-apoptotic (IG20) activities."},"narrative":{"mechanistic_narrative":"MADD is a multifunctional DENN-domain guanine-nucleotide exchange factor (GEF) that activates Rab3 and Rab27 subfamily GTPases to drive regulated, Ca2+-dependent exocytosis across diverse secretory systems [PMID:20937701, PMID:16473592]. As a Rab3 GEF it loads lipid-modified Rab3A/B/C/D with GTP and controls Ca2+-dependent vesicular release, and it preferentially binds GTP-Rab3 as an effector while serving as cargo for KIF1Bbeta/KIF1A motors that transport MADD and Rab3 down axons in a nucleotide-state-dependent manner [PMID:18849981, PMID:16473592]. Family-wide and tissue-specific studies established MADD as the GEF for Rab27A/B, an activity required for amylase release from parotid acinar cells, glucose-induced insulin secretion from pancreatic beta-cells, histamine-evoked von Willebrand factor release from endothelial Weibel-Palade bodies, and degranulation/cytotoxicity of NK and CD8+ T cells; in lymphocytes MADD controls the Rab27a activation step rather than granule trafficking to the synapse [PMID:20937701, PMID:23702376, PMID:24379354, PMID:34551092, PMID:38506245]. The endocytic GTPase Rab11A physically couples recycling endosomes to secretory vesicles by binding and activating the MADD/Rab27B pathway [PMID:37604243]. Independently of its GEF function, MADD binds the death domain of TNFR1 through its own C-terminal death domain and couples TNFR1 specifically to ERK/MAPK activation by recruiting Grb2 and Sos1/2, while competing with TRADD for TNFR1 [PMID:9115275, PMID:15007167, PMID:19289468]. MADD also acts as a pro-survival factor by directly binding TRAIL death receptors DR4/DR5 to block FADD and caspase-8 recruitment; this protection requires Akt-mediated phosphorylation at three conserved sites, and dephosphorylated MADD relocates to the cytoplasm, binds 14-3-3 to displace Bax, and triggers the mitochondrial apoptotic pathway [PMID:17314102, PMID:20484047, PMID:24038283]. Alternative splicing of the IG20/MADD locus generates isoforms with opposing activities, with the MADD variant necessary and sufficient for cancer cell survival and the IG20 variant promoting death-receptor apoptosis [PMID:11577081, PMID:15208670, PMID:16682944]. Biallelic loss-of-function MADD variants in patients cause cellular defects in TNF-alpha/ERK signaling, vesicular trafficking, and Weibel-Palade body secretion competence [PMID:40668965, PMID:32761064].","teleology":[{"year":1997,"claim":"Established MADD's first molecular role by showing it physically links TNFR1 to MAP kinase signaling, defining it as a death-domain adaptor rather than merely a death-inducing factor.","evidence":"Yeast two-hybrid, reciprocal Co-IP, and overexpression assays in human cells","pmids":["9115275"],"confidence":"High","gaps":["Did not establish which endogenous isoform mediates the interaction","Direct vs indirect coupling to ERK machinery not defined"]},{"year":2001,"claim":"Showed that splice variants of the same gene exert opposing effects on TNF-alpha apoptosis, reframing MADD/IG20 as a locus whose isoform balance tunes cell fate.","evidence":"Stable transfection of HeLa cells, caspase assays, Co-IP, flow cytometry","pmids":["11577081"],"confidence":"High","gaps":["Structural basis for opposing isoform activities unresolved","Endogenous isoform ratios in normal vs tumor tissue not measured"]},{"year":2004,"claim":"Defined MADD as a competitor of TRADD at TNFR1 and showed its loss kills neurons, while a separate study showed the pro-apoptotic IG20 variant promotes DR4/DR5 DISC assembly, beginning to dissect isoform-specific death-receptor outputs.","evidence":"Co-IP competition assays, antisense knockdown in primary neurons, colocalization and DN-FADD/caspase-inhibitor experiments","pmids":["15007167","15208670"],"confidence":"Medium","gaps":["Single-lab Co-IP competition without quantitative affinity","Did not separate direct receptor binding from downstream DISC effects"]},{"year":2006,"claim":"Demonstrated by isoform-selective knockdown and rescue that the MADD variant alone is necessary and sufficient for cancer cell survival, elevating it from a signaling adaptor to a survival dependency.","evidence":"Exon-specific shRNA knockdown with rescue re-expression, flow cytometry across multiple cancer lines","pmids":["16682944"],"confidence":"High","gaps":["Survival mechanism downstream of MADD not yet defined here","Generalizability beyond tested cancer lines unaddressed"]},{"year":2007,"claim":"Resolved the survival mechanism by showing MADD directly binds DR4/DR5 (but not FADD or caspase-8) and acts as a negative regulator of caspase-8 activation at the receptor.","evidence":"Immunoprecipitation (negative for caspase-8/FADD), shRNA knockdown, caspase-8 assays, CrmA/DN-FADD rescue","pmids":["17314102"],"confidence":"High","gaps":["Stoichiometry of MADD-DR4/DR5 occupancy unknown","Structural interface not defined"]},{"year":2008,"claim":"Connected MADD to motor-driven trafficking by showing it binds the stalk of KIF1Bbeta/KIF1A, acts as a GTP-Rab3 effector, and is required for axonal transport of Rab3.","evidence":"Reciprocal Co-IP, direct binding assays, sequential genetic knockouts, live axonal transport imaging","pmids":["18849981"],"confidence":"High","gaps":["Relationship between GEF activity and motor binding not integrated","Regulation of cargo handoff unresolved"]},{"year":2009,"claim":"Pinpointed the signaling specificity of MADD by showing endogenous MADD is required for TNF-alpha-induced ERK (not JNK, p38, or NF-kappaB) via Grb2/Sos1/2 recruitment to TNFR1.","evidence":"Isoform-selective shRNA with rescue, multiplexed kinase and reporter assays, TNFR1 complex Co-IP","pmids":["19289468"],"confidence":"High","gaps":["Direct vs scaffolded recruitment of Grb2/Sos not structurally defined","Reconciliation with earlier JNK-activation observation not addressed"]},{"year":2010,"claim":"Defined the biochemical core of MADD as a DENN-domain GEF for Rab3 and Rab27A/B and showed Akt phosphorylation at three sites gates its death-receptor binding, unifying the secretory and survival functions under a single regulated scaffold.","evidence":"Family-wide GEF/Rab-GTP loading assays; phosphosite mapping with DN-Akt and PI3K inhibition, Co-IP","pmids":["20937701","20484047"],"confidence":"High","gaps":["Whether GEF and death-receptor functions occur on the same molecules simultaneously is unclear","Kinetics of TRAIL-induced dephosphorylation not quantified"]},{"year":2013,"claim":"Extended MADD GEF function to physiological secretion by showing its Rab27 activity is required for amylase release and that beta-cell knockout causes a glucose-induced insulin secretion defect.","evidence":"Antibody microinjection in permeabilized acinar cells with Rab27-GTP pull-down; conditional beta-cell knockout mouse with secretion and processing assays","pmids":["23702376","24379354"],"confidence":"High","gaps":["Acinar antibody-block study is single-lab and indirect","Upstream Ca2+/signaling control of MADD GEF activity in beta-cells undefined"]},{"year":2014,"claim":"Closed the survival-to-death switch by showing PTEN-driven MADD dephosphorylation relocates MADD to the cytoplasm, where it binds 14-3-3 to release Bax and trigger mitochondrial apoptosis.","evidence":"siRNA knockdown, subcellular fractionation, Co-IP of MADD-14-3-3-Bax, cytochrome c release assays","pmids":["24038283"],"confidence":"Medium","gaps":["Single-lab fractionation evidence for translocation","Direct competition of MADD vs Bax for 14-3-3 not quantified"]},{"year":2021,"claim":"Established MADD as the GEF activating Rab27A/Rab3B/Rab3D for Weibel-Palade body targeting and VWF release, and showed catalytic GEF activity and cytosolic localization—not just Rab binding—are required.","evidence":"siRNA, GTP-pull-down across multiple Rabs, DENN-domain mutants, TOMM70 mistargeting, VWF secretion assay","pmids":["34551092"],"confidence":"High","gaps":["How MADD is recruited to specific vesicle classes not resolved","Coordination among the multiple Rab substrates unclear"]},{"year":2023,"claim":"Linked endocytic recycling to secretion by showing Rab11A physically binds and activates the MADD/Rab27B pathway downstream of CaSR/PI3K signaling.","evidence":"Co-IP, Rab activity assays, PI3K inhibitors, siRNA, cytokine secretion assays","pmids":["37604243"],"confidence":"Medium","gaps":["Direct vs indirect Rab11A-MADD interaction not distinguished","Single-lab; physiological generality untested"]},{"year":2024,"claim":"Cemented MADD's secretory role and its disease relevance through patient cells: biallelic loss abolishes MADD protein and Rab27A/Rab3D activation, impairing WPB exocytosis and VWF secretion, while MADD knockout blocks the Rab27a-activation step required for cytotoxic lymphocyte degranulation; a splice variant retaining GEF activity still causes endocrine defects, implicating protein-protein interactions beyond catalysis.","evidence":"Patient-derived ECFC proteomics and live imaging; CRISPR knockout in NK/CD8+ cells with GTP pull-down and cytotoxicity; stem cell-derived islet/gonadotrope dex30 models with GEF assays","pmids":["40668965","38506245","38775154"],"confidence":"High","gaps":["Non-catalytic interaction partners driving dex30 phenotype not identified","Tissue-specific determinants of clinical variability unresolved"]},{"year":2024,"claim":"Identified an upstream expression-control mechanism whereby lactylated nucleolin promotes productive MADD translation by bypassing a splicing-induced premature stop codon, driving downstream ERK signaling in a tumor context.","evidence":"Mass spectrometry, RNA splicing analysis, interaction assays, xenograft model, siRNA","pmids":["38679071"],"confidence":"Medium","gaps":["Single-lab; metabolic-to-MADD regulation not validated in other tissues","Direct effect on MADD isoform balance in vivo unquantified"]},{"year":null,"claim":"It remains unresolved how MADD's GEF/secretory functions and its death-receptor/MAPK scaffold functions are coordinated within a single cell, and what governs the choice between them.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating DENN GEF activity with death-domain signaling","Spatiotemporal partitioning of MADD pools across membranes not mapped","In vivo phosphorylation-state regulation of the survival/death switch undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,7,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,8,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[21,8,12]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12,13,21]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[13,15]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[9,13,16,11]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,7,8]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,1,12]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[15]}],"complexes":["TNFR1 signaling complex","TRAIL DISC (DR4/DR5)"],"partners":["TNFR1","DR4","DR5","GRB2","KIF1B","KIF1A","14-3-3","RAB11A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WXG6","full_name":"MAP kinase-activating death domain protein","aliases":["Differentially expressed in normal and neoplastic cells","Insulinoma glucagonoma clone 20","Rab3 GDP/GTP exchange factor","RabGEF","Rab3 GDP/GTP exchange protein","Rab3GEP"],"length_aa":1647,"mass_kda":183.3,"function":"Guanyl-nucleotide exchange factor that regulates small GTPases of the Rab family (PubMed:18559336, PubMed:20937701). Converts GDP-bound inactive form of RAB27A and RAB27B to the GTP-bound active forms (PubMed:18559336, PubMed:20937701). Converts GDP-bound inactive form of RAB3A, RAB3C and RAB3D to the GTP-bound active forms, GTPases involved in synaptic vesicle exocytosis and vesicle secretion (By similarity). Plays a role in synaptic vesicle formation and in vesicle trafficking at the neuromuscular junction (By similarity). Involved in up-regulating a post-docking step of synaptic exocytosis in central synapses (By similarity). Probably by binding to the motor proteins KIF1B and KIF1A, mediates motor-dependent transport of GTP-RAB3A-positive vesicles to the presynaptic nerve terminals (By similarity). Plays a role in TNFA-mediated activation of the MAPK pathway, including ERK1/2 (PubMed:32761064). May link TNFRSF1A with MAP kinase activation (PubMed:9115275). May be involved in the regulation of TNFA-induced apoptosis (PubMed:11577081, PubMed:32761064)","subcellular_location":"Cell membrane; Cytoplasm; Cell projection, axon","url":"https://www.uniprot.org/uniprotkb/Q8WXG6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MADD","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CSNK2B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MADD","total_profiled":1310},"omim":[{"mim_id":"619005","title":"NEURODEVELOPMENTAL DISORDER WITH DYSMORPHIC FACIES, IMPAIRED SPEECH, AND HYPOTONIA; NEDDISH","url":"https://www.omim.org/entry/619005"},{"mim_id":"619004","title":"DEEAH SYNDROME; 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Cardiovascular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24951664","citation_count":10,"is_preprint":false},{"pmid":"27123983","id":"PMC_27123983","title":"The MADD-3 LAMMER Kinase Interacts with a p38 MAP Kinase Pathway to Regulate the Display of the EVA-1 Guidance Receptor in Caenorhabditis elegans.","date":"2016","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27123983","citation_count":8,"is_preprint":false},{"pmid":"23201576","id":"PMC_23201576","title":"The Caenorhabditis elegans homolog of the Opitz syndrome gene, madd-2/Mid1, regulates anchor cell invasion during vulval development.","date":"2012","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/23201576","citation_count":8,"is_preprint":false},{"pmid":"33983408","id":"PMC_33983408","title":"Specific heparan sulfate modifications stabilize the synaptic organizer MADD-4/Punctin at Caenorhabditis elegans neuromuscular 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neurologique","url":"https://pubmed.ncbi.nlm.nih.gov/19592060","citation_count":7,"is_preprint":false},{"pmid":"34064479","id":"PMC_34064479","title":"Role of RNA in Molecular Diagnosis of MADD Patients.","date":"2021","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/34064479","citation_count":6,"is_preprint":false},{"pmid":"30999276","id":"PMC_30999276","title":"MADD silencing enhances anti-tumor activity of TRAIL in anaplastic thyroid cancer.","date":"2019","source":"Endocrine-related cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30999276","citation_count":6,"is_preprint":false},{"pmid":"34041209","id":"PMC_34041209","title":"Hepatic Presentation of Late-Onset Multiple Acyl-CoA Dehydrogenase Deficiency (MADD): Case Report and Systematic Review.","date":"2021","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/34041209","citation_count":6,"is_preprint":false},{"pmid":"22678883","id":"PMC_22678883","title":"DENN/MADD/IG20 alternative splicing changes and cell death in Alzheimer's disease.","date":"2012","source":"Journal of molecular neuroscience : MN","url":"https://pubmed.ncbi.nlm.nih.gov/22678883","citation_count":5,"is_preprint":false},{"pmid":"12906859","id":"PMC_12906859","title":"Molecular cloning, structural analysis, and expression of a human IRLB, MYC promoter-binding protein: new DENN domain-containing protein family emerges.","date":"2003","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/12906859","citation_count":5,"is_preprint":false},{"pmid":"23443411","id":"PMC_23443411","title":"MADD promotes the survival of human lung adenocarcinoma cells by inhibiting apoptosis.","date":"2013","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/23443411","citation_count":5,"is_preprint":false},{"pmid":"38506245","id":"PMC_38506245","title":"MADD regulates natural killer cell degranulation through Rab27a activation.","date":"2024","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/38506245","citation_count":4,"is_preprint":false},{"pmid":"37604243","id":"PMC_37604243","title":"CaSR links endocytic and secretory pathways via MADD, a Rab11A effector that activates Rab27B.","date":"2023","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/37604243","citation_count":4,"is_preprint":false},{"pmid":"30947659","id":"PMC_30947659","title":"MADD Expression in Lung Adenocarcinoma and its Impact on Proliferation and Apoptosis of Lung Adenocarcinoma Cells.","date":"2019","source":"Combinatorial chemistry & high throughput screening","url":"https://pubmed.ncbi.nlm.nih.gov/30947659","citation_count":4,"is_preprint":false},{"pmid":"16473592","id":"PMC_16473592","title":"Purification and properties of Rab3 GEP (DENN/MADD).","date":"2005","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/16473592","citation_count":4,"is_preprint":false},{"pmid":"38775154","id":"PMC_38775154","title":"A splice site variant in MADD affects hormone expression in pancreatic β cells and pituitary gonadotropes.","date":"2024","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/38775154","citation_count":4,"is_preprint":false},{"pmid":"25854358","id":"PMC_25854358","title":"TRAIL suppresses human breast cancer cell migration via MADD/CXCR7.","date":"2015","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/25854358","citation_count":4,"is_preprint":false},{"pmid":"34819910","id":"PMC_34819910","title":"Clinical Presentations and Genetic Characteristics of Late-Onset MADD Due to ETFDH Mutations in Five Patients: A Case Series.","date":"2021","source":"Frontiers in neurology","url":"https://pubmed.ncbi.nlm.nih.gov/34819910","citation_count":4,"is_preprint":false},{"pmid":"36042283","id":"PMC_36042283","title":"madd-4 plays a critical role in light against Bursaphelenchus xylophilus.","date":"2022","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36042283","citation_count":3,"is_preprint":false},{"pmid":"38221620","id":"PMC_38221620","title":"Clinical, biochemical, and genetic spectrum of MADD in a South African cohort: an ICGNMD study.","date":"2024","source":"Orphanet journal of rare diseases","url":"https://pubmed.ncbi.nlm.nih.gov/38221620","citation_count":3,"is_preprint":false},{"pmid":"37932938","id":"PMC_37932938","title":"Calloso-adreno-scrotal agenesis associated with biallelic MAPK-activating death domain protein (MADD) variant: Further phenotypic delineation of MADD deficiency.","date":"2023","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/37932938","citation_count":3,"is_preprint":false},{"pmid":"40668965","id":"PMC_40668965","title":"A novel cause of type 1 von Willebrand disease: impaired exocytosis of Weibel-Palade bodies due to biallelic MADD variants.","date":"2025","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/40668965","citation_count":3,"is_preprint":false},{"pmid":"28455410","id":"PMC_28455410","title":"Into the linker's DENN: A tyrosine's control of autophagy.","date":"2017","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28455410","citation_count":3,"is_preprint":false},{"pmid":"33383363","id":"PMC_33383363","title":"Late-onset MADD in Yemen caused by a novel ETFDH mutation misdiagnosed as ADEM.","date":"2020","source":"Multiple sclerosis and related disorders","url":"https://pubmed.ncbi.nlm.nih.gov/33383363","citation_count":3,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49732,"output_tokens":5815,"usd":0.11821,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14169,"output_tokens":5037,"usd":0.098385,"stage2_stop_reason":"end_turn"},"total_usd":0.216595,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"MADD associates with the death domain of TNFR1 through its own C-terminal death domain, co-immunoprecipitates with TNFR1, and overexpression of MADD activates ERK MAP kinase; expression of the MADD death domain stimulates both ERK and JNK MAP kinases and induces phosphorylation of cytosolic phospholipase A2.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, overexpression assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus yeast interaction trap plus functional overexpression assays; foundational paper replicated by multiple subsequent studies\",\n      \"pmids\": [\"9115275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"IG20 and DENN-SV (splice variants of the same gene as MADD) exert opposing effects on TNF-alpha-induced apoptosis: IG20 enhances caspase-8 and caspase-3 activation and renders cells more susceptible to apoptosis, while DENN-SV reduces caspase activation and confers resistance. All variants interact with TNFR1 and activate ERK and NF-kappaB.\",\n      \"method\": \"Stable transfection of HeLa cells, caspase activity assays, co-immunoprecipitation, flow cytometry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal functional assays in stably transfected cells, replicated across subsequent studies from multiple labs\",\n      \"pmids\": [\"11577081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DENN/MADD and TRADD competitively bind to TNFR1; overexpressed DENN/MADD abrogates TNFR1 binding to TRADD. Antisense knockdown of DENN/MADD in rat hippocampal neurons reduces endogenous DENN/MADD and promotes neuronal cell death.\",\n      \"method\": \"Overexpression in N2A cells, co-immunoprecipitation, antisense oligonucleotide knockdown in primary cultures, immunohistochemistry\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP competition assay plus antisense KD with cell death phenotype, single lab\",\n      \"pmids\": [\"15007167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"IG20 (proapoptotic splice variant of MADD/IG20 gene) interacts with TRAIL death receptors DR4 and DR5 and increases recruitment of FADD and caspase-8 into the TRAIL DISC, thereby enhancing TRAIL-induced apoptosis.\",\n      \"method\": \"Colocalization imaging, co-immunoprecipitation, dominant-negative FADD expression, caspase inhibitor experiments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional rescue with DN-FADD and caspase inhibitors, single lab\",\n      \"pmids\": [\"15208670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Selective knockdown of the MADD splice variant (using exon-specific shRNAs) results in spontaneous apoptosis of cancer cells; re-expression of MADD alone (without other IG20 isoforms) is sufficient to rescue cells from apoptosis, demonstrating MADD is necessary and sufficient for cancer cell survival.\",\n      \"method\": \"Exon-specific shRNA knockdown, lentiviral delivery, rescue re-expression, flow cytometry apoptosis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — selective isoform-specific KD with rescue experiment, multiple cell lines, rigorous controls\",\n      \"pmids\": [\"16682944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MADD directly interacts with death receptors (DR4/DR5) but not with caspase-8 or FADD, and functions as a negative regulator of caspase-8 activation at death receptors. Knockdown of MADD leads to caspase-8 activation at death receptors and sensitizes cancer cells to TRAIL-induced apoptosis.\",\n      \"method\": \"Immunoprecipitation, shRNA knockdown, caspase-8 activation assays, CrmA and DN-FADD rescue experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assay (negative for caspase-8/FADD), shRNA KD with functional readout, multiple rescue controls\",\n      \"pmids\": [\"17314102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DENN/MADD (Rab3-GEP) directly interacts with the stalk domain of KIF1Bbeta and KIF1A motors and preferentially binds GTP-Rab3 (acting as a Rab3 effector). Sequential genetic perturbations showed KIF1Bbeta/KIF1A are required for transport of DENN/MADD and Rab3, and DENN/MADD is essential for axonal transport of Rab3. GTP-Rab3 is more efficiently transported than GDP-Rab3.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assays, genetic knockouts (sequential), live imaging of axonal transport\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis with multiple knockouts, direct binding, functional transport assays; published in high-quality journal\",\n      \"pmids\": [\"18849981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Endogenous MADD is specifically required for TNF-alpha-induced activation of MAPK/ERK (but not JNK, p38, or NF-kappaB, and not EGF-induced MAPK activation). MADD loss reduces Grb2 and Sos1/2 recruitment to the TNFR1 complex and decreases Ras and MEKK1/2 activation. Re-expression of shRNA-resistant MADD rescues cells from TNF-alpha-induced apoptosis.\",\n      \"method\": \"Exon-specific shRNA knockdown, kinase activation assays (ERK, JNK, p38), NF-kappaB reporter assays, TNFR1 complex immunoprecipitation, rescue re-expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-selective KD with rescue, multiple pathway readouts, Co-IP of signaling complex, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19289468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MADD is phosphorylated at three conserved sites by Akt; only phosphorylated MADD directly interacts with TRAIL receptor DR4, preventing FADD recruitment. TRAIL induces reduction in MADD phosphorylation in susceptible cells, causing MADD dissociation from DR4 and allowing DISC formation. In TRAIL-resistant cells, MADD phosphorylation is maintained.\",\n      \"method\": \"Phosphorylation assays, co-immunoprecipitation, dominant-negative Akt expression, PI3K inhibitor (LY294002), Western blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — phosphorylation site identification, direct binding assays, dominant-negative and pharmacological inhibition, multiple cell lines\",\n      \"pmids\": [\"20484047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MADD activates Rab27A and Rab27B as a DENN-domain GDP/GTP exchange factor, as demonstrated in a systematic characterization of 17 human DENN domain proteins; MADD-specific GEF activity toward Rab27A/27B was established in this family-wide study.\",\n      \"method\": \"GEF activity assays, Rab-GTP loading assays, localization studies across DENN family members\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro GEF activity assays, systematic family-wide characterization with multiple orthogonal methods, replicated in subsequent studies\",\n      \"pmids\": [\"20937701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MADD/DENN/Rab3GEP functions as a GEF for Rab27 in rat parotid acinar cells: an antibody against the C-terminal 150 amino acids of MADD inhibited isoproterenol-induced amylase release and reduced GTP-Rab27 levels in permeabilized cells, indicating MADD's GEF activity for Rab27 is required for regulated exocytosis.\",\n      \"method\": \"Antibody microinjection into streptolysin O-permeabilized acinar cells, Rab27-GTP pull-down assay, amylase release assay, RT-PCR\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional inhibition with specific antibody plus GTP-loading assay, single lab\",\n      \"pmids\": [\"23702376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Conditional knockout of IG20/MADD in pancreatic beta-cells results in hyperglycemia and glucose intolerance due to a severe defect in glucose-induced insulin release (not insulin processing), with increased insulin accumulation in beta-cells.\",\n      \"method\": \"Conditional knockout mouse model (KMA1ko), glucose tolerance tests, insulin secretion assays, insulin processing analysis, immunostaining\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with specific cellular phenotype (secretion defect, not processing), multiple functional readouts\",\n      \"pmids\": [\"24379354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PTEN upregulation reduces MADD phosphorylation by Akt; non-phosphorylated MADD translocates from the plasma membrane to the cytoplasm where it binds 14-3-3, displacing Bax which then translocates to mitochondria causing cytochrome c release and apoptosis. PTEN siRNA knockdown prevents TRAIL-induced reduction in phospho-MADD.\",\n      \"method\": \"siRNA knockdown, Western blotting, subcellular fractionation, co-immunoprecipitation, cytochrome c release assay\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular fractionation showing localization change, Co-IP of MADD-14-3-3-Bax interactions, siRNA knockdown, single lab\",\n      \"pmids\": [\"24038283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MADD acts as the GEF for Rab27A, Rab3B, and Rab3D in primary human endothelial cells, driving their activation and recruitment to Weibel-Palade bodies (WPBs). MADD silencing reduces GTP-Rab27A, Rab3B, and Rab3D levels, decreases Rab localization to WPBs, and impairs histamine-evoked VWF release. The DENN domain of MADD is required for Rab activation but not binding. Cytosolic localization of MADD is essential for WPB targeting of Rabs.\",\n      \"method\": \"siRNA knockdown, Rab activity (GTP-pull-down) assays, DENN-domain mutant constructs, TOMM70 mistargeting experiment, immunofluorescence, VWF secretion assay\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — GEF activity assays, domain mutant analysis, mistargeting experiment, multiple Rab substrates, functional secretion readout\",\n      \"pmids\": [\"34551092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Patient-derived endothelial cells (ECFCs) with biallelic MADD variants lack MADD protein, show reduced Rab27A and Rab3D activity and their failure to localize to WPBs, and have significantly reduced histamine-induced VWF and VWF propeptide secretion due to delayed and reduced WPB degranulation, establishing MADD as required for WPB secretion competence.\",\n      \"method\": \"Patient-derived ECFC isolation, proteomics, Rab activity assays, live-cell imaging of WPB exocytosis, VWF secretion assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — patient-derived cells with biallelic loss-of-function variants, proteomics, live imaging, multiple functional secretion readouts; corroborates prior mechanistic studies\",\n      \"pmids\": [\"40668965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MADD knockout significantly decreases GTP-bound Rab27a in NK cells and CD8+ T cells; MADD-deficient cytotoxic lymphocytes show severely reduced degranulation and cytolytic ability similar to Rab27a-deficient cells. MADD colocalizes with Rab27a on lytic granules and is enriched at the cytolytic synapse, but loss of MADD does not affect Rab27a association with lytic granules or their recruitment to the synapse.\",\n      \"method\": \"CRISPR knockout, Rab27a-GTP pull-down assay, degranulation assays (CD107a), cytotoxicity assays, confocal imaging\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO with GTP-loading assay, functional cytotoxicity readout, confocal localization, mechanistically distinguishes activation from trafficking steps\",\n      \"pmids\": [\"38506245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Recombinant Rab3 GEP (DENN/MADD) is active as a GEF on lipid-modified Rab3A, Rab3B, Rab3C, and Rab3D but is inactive on lipid-unmodified Rab3A or Rab3A complexed with Rab GDI. Overexpression of Rab3 GEP inhibits Ca2+-dependent exocytosis from PC12 cells.\",\n      \"method\": \"Biochemical purification of recombinant protein from Sf9 cells, in vitro GEF activity assay, human growth hormone co-expression exocytosis assay in PC12 cells\",\n      \"journal\": \"Methods in enzymology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted GEF assay with substrate specificity characterization, functional exocytosis assay; single lab but rigorous biochemical methods\",\n      \"pmids\": [\"16473592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Patient-derived fibroblasts with biallelic MADD variants show reduced phosphorylation of ERK1/2 upon TNF-alpha treatment, enhanced activation of caspase-3 and -7, increased apoptosis, and a defect in endocytosis of epidermal growth factor, demonstrating that MADD deficiency causes multiple cellular defects in TNF-alpha signaling and vesicular trafficking.\",\n      \"method\": \"Patient-derived fibroblast functional assays, Western blotting for pERK1/2, caspase activation assays, EGF endocytosis assay, mRNA/protein quantification\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived cells with biallelic variants, multiple orthogonal functional assays across two distinct pathways\",\n      \"pmids\": [\"32761064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nucleolin lactylated at K477 by P300 (in response to glycolysis) binds the primary transcript of MADD and promotes efficient MADD translation by circumventing alternative splicing that generates a premature termination codon; lactylated NCL upregulates MADD expression and activates downstream ERK signaling.\",\n      \"method\": \"Mass spectrometry, macromolecule interaction assays, RNA splicing analysis, xenograft tumor model, Western blotting, siRNA knockdown\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry identification of lactylation site, functional splicing assay, in vivo xenograft validation; single lab\",\n      \"pmids\": [\"38679071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CaSR activation drives Rab11A-dependent coupling of recycling endosomes to secretory vesicles via endosomal PI3K-mediated activation of a MADD/Rab27B pathway. Rab11A physically interacts with and activates MADD (GEF for Rab3 and Rab27A/B), linking endocytic and secretory pathways.\",\n      \"method\": \"Co-immunoprecipitation, Rab activity assays, PI3K inhibitors, siRNA knockdown, cytokine secretion assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of Rab11A-MADD interaction, Rab activity assays, pharmacological and siRNA perturbation; single lab\",\n      \"pmids\": [\"37604243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A splice site variant in MADD causing skipping of exon 30 (in-frame deletion of 36 amino acids) reduces insulin content and increases proinsulin-to-insulin ratio in stem cell-derived pancreatic islets, and decreases luteinizing hormone expression in gonadotrope cells; the GDP/GTP exchange activity of dex30 MADD remains intact, suggesting the endocrine phenotype arises through altered protein-protein interactions rather than loss of GEF catalytic function.\",\n      \"method\": \"Human embryonic stem cell-derived pancreatic islets, CRISPR-engineered dex30 cell lines, insulin/proinsulin ELISA, LH expression assay, protein-protein interaction proteomics, GEF activity assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — GEF activity biochemical assay plus stem-cell-derived functional models, single lab\",\n      \"pmids\": [\"38775154\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The DENN protein (identical to MADD) localizes predominantly to the cell membrane with some cytoplasmic staining as determined by immunofluorescent labeling of human cells with polyclonal antibodies, and was identified as a 140–145 kDa protein on Western blots.\",\n      \"method\": \"Immunofluorescence, Western blotting with polyclonal antisera\",\n      \"journal\": \"DNA sequence : the journal of DNA sequencing and mapping\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single immunofluorescence localization study with no functional consequence linked\",\n      \"pmids\": [\"8988362\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MADD is a multifunctional scaffold protein that acts as a DENN-domain GDP/GTP exchange factor (GEF) for Rab3 subfamily members and Rab27A/B, activating these GTPases on secretory vesicles (synaptic vesicle precursors, Weibel-Palade bodies, lytic granules, and secretory granules) to regulate Ca2+-dependent exocytosis and vesicle trafficking; it also associates with the death domain of TNFR1 through its own C-terminal death domain and couples TNFR1 to ERK/MAPK activation via Grb2/Sos1/2 recruitment, while simultaneously protecting cells from apoptosis by directly binding death receptors DR4/DR5 to prevent FADD and caspase-8 recruitment—a pro-survival function that is dependent on Akt-mediated phosphorylation of MADD at three conserved sites, since dephosphorylated MADD relocates to the cytoplasm to displace Bax from 14-3-3, triggering the mitochondrial apoptotic pathway; KIF1Bbeta and KIF1A motors transport DENN/MADD and its GTP-Rab3 cargo down axons in a nucleotide-state-dependent manner; and alternative splicing of the IG20/MADD locus generates isoforms with opposing pro-survival (MADD/DENN-SV) and pro-apoptotic (IG20) activities.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MADD is a multifunctional DENN-domain guanine-nucleotide exchange factor (GEF) that activates Rab3 and Rab27 subfamily GTPases to drive regulated, Ca2+-dependent exocytosis across diverse secretory systems [#9, #16]. As a Rab3 GEF it loads lipid-modified Rab3A/B/C/D with GTP and controls Ca2+-dependent vesicular release, and it preferentially binds GTP-Rab3 as an effector while serving as cargo for KIF1Bbeta/KIF1A motors that transport MADD and Rab3 down axons in a nucleotide-state-dependent manner [#6, #16]. Family-wide and tissue-specific studies established MADD as the GEF for Rab27A/B, an activity required for amylase release from parotid acinar cells, glucose-induced insulin secretion from pancreatic beta-cells, histamine-evoked von Willebrand factor release from endothelial Weibel-Palade bodies, and degranulation/cytotoxicity of NK and CD8+ T cells; in lymphocytes MADD controls the Rab27a activation step rather than granule trafficking to the synapse [#9, #10, #11, #13, #15]. The endocytic GTPase Rab11A physically couples recycling endosomes to secretory vesicles by binding and activating the MADD/Rab27B pathway [#19]. Independently of its GEF function, MADD binds the death domain of TNFR1 through its own C-terminal death domain and couples TNFR1 specifically to ERK/MAPK activation by recruiting Grb2 and Sos1/2, while competing with TRADD for TNFR1 [#0, #2, #7]. MADD also acts as a pro-survival factor by directly binding TRAIL death receptors DR4/DR5 to block FADD and caspase-8 recruitment; this protection requires Akt-mediated phosphorylation at three conserved sites, and dephosphorylated MADD relocates to the cytoplasm, binds 14-3-3 to displace Bax, and triggers the mitochondrial apoptotic pathway [#5, #8, #12]. Alternative splicing of the IG20/MADD locus generates isoforms with opposing activities, with the MADD variant necessary and sufficient for cancer cell survival and the IG20 variant promoting death-receptor apoptosis [#1, #3, #4]. Biallelic loss-of-function MADD variants in patients cause cellular defects in TNF-alpha/ERK signaling, vesicular trafficking, and Weibel-Palade body secretion competence [#14, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established MADD's first molecular role by showing it physically links TNFR1 to MAP kinase signaling, defining it as a death-domain adaptor rather than merely a death-inducing factor.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, and overexpression assays in human cells\",\n      \"pmids\": [\"9115275\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish which endogenous isoform mediates the interaction\", \"Direct vs indirect coupling to ERK machinery not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed that splice variants of the same gene exert opposing effects on TNF-alpha apoptosis, reframing MADD/IG20 as a locus whose isoform balance tunes cell fate.\",\n      \"evidence\": \"Stable transfection of HeLa cells, caspase assays, Co-IP, flow cytometry\",\n      \"pmids\": [\"11577081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for opposing isoform activities unresolved\", \"Endogenous isoform ratios in normal vs tumor tissue not measured\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined MADD as a competitor of TRADD at TNFR1 and showed its loss kills neurons, while a separate study showed the pro-apoptotic IG20 variant promotes DR4/DR5 DISC assembly, beginning to dissect isoform-specific death-receptor outputs.\",\n      \"evidence\": \"Co-IP competition assays, antisense knockdown in primary neurons, colocalization and DN-FADD/caspase-inhibitor experiments\",\n      \"pmids\": [\"15007167\", \"15208670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP competition without quantitative affinity\", \"Did not separate direct receptor binding from downstream DISC effects\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated by isoform-selective knockdown and rescue that the MADD variant alone is necessary and sufficient for cancer cell survival, elevating it from a signaling adaptor to a survival dependency.\",\n      \"evidence\": \"Exon-specific shRNA knockdown with rescue re-expression, flow cytometry across multiple cancer lines\",\n      \"pmids\": [\"16682944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Survival mechanism downstream of MADD not yet defined here\", \"Generalizability beyond tested cancer lines unaddressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the survival mechanism by showing MADD directly binds DR4/DR5 (but not FADD or caspase-8) and acts as a negative regulator of caspase-8 activation at the receptor.\",\n      \"evidence\": \"Immunoprecipitation (negative for caspase-8/FADD), shRNA knockdown, caspase-8 assays, CrmA/DN-FADD rescue\",\n      \"pmids\": [\"17314102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of MADD-DR4/DR5 occupancy unknown\", \"Structural interface not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected MADD to motor-driven trafficking by showing it binds the stalk of KIF1Bbeta/KIF1A, acts as a GTP-Rab3 effector, and is required for axonal transport of Rab3.\",\n      \"evidence\": \"Reciprocal Co-IP, direct binding assays, sequential genetic knockouts, live axonal transport imaging\",\n      \"pmids\": [\"18849981\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between GEF activity and motor binding not integrated\", \"Regulation of cargo handoff unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Pinpointed the signaling specificity of MADD by showing endogenous MADD is required for TNF-alpha-induced ERK (not JNK, p38, or NF-kappaB) via Grb2/Sos1/2 recruitment to TNFR1.\",\n      \"evidence\": \"Isoform-selective shRNA with rescue, multiplexed kinase and reporter assays, TNFR1 complex Co-IP\",\n      \"pmids\": [\"19289468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs scaffolded recruitment of Grb2/Sos not structurally defined\", \"Reconciliation with earlier JNK-activation observation not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the biochemical core of MADD as a DENN-domain GEF for Rab3 and Rab27A/B and showed Akt phosphorylation at three sites gates its death-receptor binding, unifying the secretory and survival functions under a single regulated scaffold.\",\n      \"evidence\": \"Family-wide GEF/Rab-GTP loading assays; phosphosite mapping with DN-Akt and PI3K inhibition, Co-IP\",\n      \"pmids\": [\"20937701\", \"20484047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GEF and death-receptor functions occur on the same molecules simultaneously is unclear\", \"Kinetics of TRAIL-induced dephosphorylation not quantified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended MADD GEF function to physiological secretion by showing its Rab27 activity is required for amylase release and that beta-cell knockout causes a glucose-induced insulin secretion defect.\",\n      \"evidence\": \"Antibody microinjection in permeabilized acinar cells with Rab27-GTP pull-down; conditional beta-cell knockout mouse with secretion and processing assays\",\n      \"pmids\": [\"23702376\", \"24379354\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acinar antibody-block study is single-lab and indirect\", \"Upstream Ca2+/signaling control of MADD GEF activity in beta-cells undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Closed the survival-to-death switch by showing PTEN-driven MADD dephosphorylation relocates MADD to the cytoplasm, where it binds 14-3-3 to release Bax and trigger mitochondrial apoptosis.\",\n      \"evidence\": \"siRNA knockdown, subcellular fractionation, Co-IP of MADD-14-3-3-Bax, cytochrome c release assays\",\n      \"pmids\": [\"24038283\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab fractionation evidence for translocation\", \"Direct competition of MADD vs Bax for 14-3-3 not quantified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established MADD as the GEF activating Rab27A/Rab3B/Rab3D for Weibel-Palade body targeting and VWF release, and showed catalytic GEF activity and cytosolic localization—not just Rab binding—are required.\",\n      \"evidence\": \"siRNA, GTP-pull-down across multiple Rabs, DENN-domain mutants, TOMM70 mistargeting, VWF secretion assay\",\n      \"pmids\": [\"34551092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MADD is recruited to specific vesicle classes not resolved\", \"Coordination among the multiple Rab substrates unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked endocytic recycling to secretion by showing Rab11A physically binds and activates the MADD/Rab27B pathway downstream of CaSR/PI3K signaling.\",\n      \"evidence\": \"Co-IP, Rab activity assays, PI3K inhibitors, siRNA, cytokine secretion assays\",\n      \"pmids\": [\"37604243\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect Rab11A-MADD interaction not distinguished\", \"Single-lab; physiological generality untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cemented MADD's secretory role and its disease relevance through patient cells: biallelic loss abolishes MADD protein and Rab27A/Rab3D activation, impairing WPB exocytosis and VWF secretion, while MADD knockout blocks the Rab27a-activation step required for cytotoxic lymphocyte degranulation; a splice variant retaining GEF activity still causes endocrine defects, implicating protein-protein interactions beyond catalysis.\",\n      \"evidence\": \"Patient-derived ECFC proteomics and live imaging; CRISPR knockout in NK/CD8+ cells with GTP pull-down and cytotoxicity; stem cell-derived islet/gonadotrope dex30 models with GEF assays\",\n      \"pmids\": [\"40668965\", \"38506245\", \"38775154\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-catalytic interaction partners driving dex30 phenotype not identified\", \"Tissue-specific determinants of clinical variability unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified an upstream expression-control mechanism whereby lactylated nucleolin promotes productive MADD translation by bypassing a splicing-induced premature stop codon, driving downstream ERK signaling in a tumor context.\",\n      \"evidence\": \"Mass spectrometry, RNA splicing analysis, interaction assays, xenograft model, siRNA\",\n      \"pmids\": [\"38679071\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab; metabolic-to-MADD regulation not validated in other tissues\", \"Direct effect on MADD isoform balance in vivo unquantified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how MADD's GEF/secretory functions and its death-receptor/MAPK scaffold functions are coordinated within a single cell, and what governs the choice between them.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating DENN GEF activity with death-domain signaling\", \"Spatiotemporal partitioning of MADD pools across membranes not mapped\", \"In vivo phosphorylation-state regulation of the survival/death switch undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005085\", \"supporting_discovery_ids\": [9, 16, 13]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 7, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 8, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [21, 8, 12]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12, 13, 21]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [13, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [9, 13, 16, 11]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 1, 12]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [\"TNFR1 signaling complex\", \"TRAIL DISC (DR4/DR5)\"],\n    \"partners\": [\"TNFR1\", \"DR4\", \"DR5\", \"Grb2\", \"KIF1B\", \"KIF1A\", \"14-3-3\", \"RAB11A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}