{"gene":"CDIP1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2007,"finding":"CDIP1 (CDIP) is a transcriptional target of p53 that promotes apoptosis through the extrinsic pathway; CDIP1 expression induces caspase-8 cleavage, and siRNA knockdown of caspase-8 severely impairs CDIP1-dependent cell death. CDIP1 also upregulates TNF-α expression in a p53-dependent manner, establishing a p53→CDIP1→TNF-α apoptotic pathway activated by genotoxic stress.","method":"siRNA knockdown, overexpression, caspase-8 inhibition/knockdown, TNF-α neutralization, genotoxic stress assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal loss-of-function experiments (siRNA for CDIP1, caspase-8, TNF-α), pathway epistasis established, independently consistent results within the study","pmids":["17599062"],"is_preprint":false},{"year":2013,"finding":"CDIP1 physically interacts with BAP31 at the ER membrane upon ER stress, and this interaction is required for BAP31 cleavage, BAP31-Bcl-2 association, and subsequent BAX oligomerization. The CDIP1–BAP31 complex recruits Bcl-2 and activates caspase-8 and truncated Bid (tBid), coupling ER-stress signals to mitochondrial apoptosis. Genetic knockout of CDIP1 in mice impairs ER-stress-mediated apoptosis.","method":"Co-immunoprecipitation, CDIP1 knockout mice, caspase-8/tBid activation assays, BAX oligomerization assay, ER stress induction","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic KO in mice with defined phenotype, multiple orthogonal biochemical readouts in one study","pmids":["24139803"],"is_preprint":false},{"year":2012,"finding":"CDIP1 expression sensitizes cancer cells to TNF-α-induced apoptosis; endogenous CDIP1 expression determines whether cells undergo apoptosis versus survival in response to TNF-α, acting downstream of p53 and in the context of JNK activation.","method":"CDIP1 knockdown/overexpression, in vitro and in vivo cancer cell growth assays with TNF-α treatment","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single lab, loss-of-function and gain-of-function with defined cellular phenotype, in vitro and in vivo","pmids":["22549949"],"is_preprint":false},{"year":2020,"finding":"LITAF and CDIP1 (LITAF-like protein) serve as host cell-surface receptors for the Bacillus cereus pore-forming toxin hemolysin BL (HBL); CDIP1 functions as an alternative HBL receptor in LITAF-deficient cells, identified by sequential genome-wide CRISPR-Cas9 knockout screens.","method":"Genome-wide CRISPR-Cas9 knockout screens (two sequential screens), LITAF-deficient cell lines and mice, lethal HBL challenge","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased genome-wide CRISPR screen replicated with a second screen, validated in KO cells and KO mice with defined resistance phenotype","pmids":["32544461"],"is_preprint":false},{"year":2021,"finding":"CDIP1 interacts with ALG-2 (PDCD6) in a Ca2+-dependent manner. Via ALG-2 as an adaptor, CDIP1 associates preferentially with ESCRT-I complexes containing VPS37B or VPS37C (specifically TSG101-containing ESCRT-I). CDIP1 also binds VAPA and VAPB through an FFAT-like motif in its C-terminal region; mutations in this motif reduce CDIP1-induced cell death. Co-expression of ALG-2 and ESCRT-I enhances CDIP1-induced caspase-3/7-mediated cell death.","method":"Co-immunoprecipitation of GFP-CDIP1, mutagenesis of FFAT-like motif, caspase-3/7 activity assays, overexpression in HEK293 cells","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutagenesis validation, caspase activity assays, single lab with two orthogonal methods","pmids":["33503978"],"is_preprint":false},{"year":1999,"finding":"C16orf5 (CDIP1) is a novel gene at chromosome 16p13.3 encoding a 261-amino-acid protein with a proline-rich N-terminus and cysteine-rich C-terminus; computational analysis predicted nuclear localization.","method":"Northern blot, FISH, Southern blot with somatic cell hybrid panel, PSORTII prediction","journal":"Journal of human genetics","confidence":"Low","confidence_rationale":"Tier 4 / Weak — localization is computational prediction only; expression data without functional validation","pmids":["10570909"],"is_preprint":false},{"year":2024,"finding":"In MCF-7 breast cancer cells, CDIP1 is localized to endosomes and is degraded via the lysosomal pathway after adriamycin treatment. CDK5 inhibition (roscovitine) increases electrophoretic mobility of CDIP1, and a phosphomimetic mutation at Ser-32 increases CDIP1-induced apoptosis. CDIP1 expression induces autophagy prior to apoptosis, and inhibition of VPS34 (autophagy) with SAR405 reduces autophagy and promotes CDIP1-induced apoptosis, indicating autophagy acts as a cytoprotective response against CDIP1-driven apoptosis.","method":"Subcellular fractionation/localization, site-directed mutagenesis (Ser-32 phosphomimetic), CDK5 inhibitor treatment, autophagy inhibitor (SAR405/VPS34 inhibitor), caspase assays, Western blot","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis, pharmacological inhibition, and localization with functional consequences, single lab, multiple orthogonal approaches","pmids":["38928226"],"is_preprint":false},{"year":2021,"finding":"CT exosomal miRNA-21-5p targets and silences Cdip1 mRNA in cardiac microvascular endothelial cells, reducing activated caspase-3 and inhibiting apoptosis under ischemic/hypoxic conditions.","method":"Small RNA sequencing, in vitro ischemia/hypoxia model, cellular and molecular validation in rat MI model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — miRNA targeting of CDIP1 validated in vitro and in vivo, but predominantly phenotypic with limited direct mechanistic dissection of CDIP1 pathway","pmids":["33391474"],"is_preprint":false},{"year":2023,"finding":"ELK1 binds the miR-31-5p promoter to enhance its transcription; miR-31-5p binds the CDIP1 3'UTR (validated by dual-luciferase assay) and inhibits CDIP1 expression, thereby suppressing apoptosis and promoting CRC cell migration, invasion, and autophagy.","method":"Dual-luciferase reporter assay, siRNA knockdown of CDIP1, miR-31-5p overexpression/inhibition, ELK1 knockdown, in vivo xenograft","journal":"PeerJ","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — dual-luciferase reporter validates 3'UTR targeting, rescue experiments confirm CDIP1 as the functional downstream target, single lab","pmids":["37547727"],"is_preprint":false},{"year":2025,"finding":"miR-133b-3p directly targets CDIP1 3'UTR (validated by dual-luciferase reporter assay); overexpression of miR-133b-3p reduces CDIP1 expression and suppresses Ang II-induced cardiomyocyte hypertrophy and apoptosis, while CDIP1 silencing phenocopies this effect.","method":"Dual-luciferase reporter assay, miR-133b-3p overexpression, CDIP1 siRNA knockdown, Ang II cardiac hypertrophy model","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — dual-luciferase reporter validates direct targeting, loss-of-function with defined phenotype, single lab","pmids":["39943804"],"is_preprint":false}],"current_model":"CDIP1 is a p53-target pro-apoptotic protein that, upon genotoxic or ER stress, is upregulated and acts as a signal transducer linking the ER to mitochondrial apoptosis via direct interaction with BAP31 at the ER membrane (facilitating BAP31 cleavage, Bcl-2 recruitment, tBid/caspase-8 activation, and BAX oligomerization), promotes TNF-α upregulation to amplify extrinsic apoptotic signaling through caspase-8, interacts with ALG-2 in a Ca2+-dependent manner and with ESCRT-I (via VPS37B/C-containing complexes) and VAPA/VAPB (via an FFAT-like motif) to drive caspase-3/7-mediated death, is localized to endosomes and subject to lysosomal degradation (regulated by CDK5-dependent phosphorylation at Ser-32), and also functions as an alternative host-cell receptor for the Bacillus cereus pore-forming toxin HBL."},"narrative":{"mechanistic_narrative":"CDIP1 is a p53-target pro-apoptotic protein that couples genotoxic and ER stress to programmed cell death through both extrinsic and intrinsic apoptotic routes [PMID:17599062, PMID:24139803]. As a transcriptional target of p53, CDIP1 drives caspase-8 cleavage and p53-dependent TNF-α upregulation, establishing a p53→CDIP1→TNF-α axis that sensitizes cells to TNF-α-induced apoptosis [PMID:17599062, PMID:22549949]. Upon ER stress, CDIP1 physically associates with BAP31 at the ER membrane, an interaction required for BAP31 cleavage, BAP31-Bcl-2 association, caspase-8/tBid activation, and BAX oligomerization, thereby relaying ER-stress signals to mitochondrial apoptosis; genetic ablation of CDIP1 in mice impairs ER-stress-mediated death [PMID:24139803]. CDIP1 further engages the Ca2+-binding protein ALG-2 (PDCD6) in a Ca2+-dependent manner, which adapts it to TSG101/VPS37B/VPS37C-containing ESCRT-I complexes, and binds VAPA/VAPB through a C-terminal FFAT-like motif whose mutation reduces CDIP1-induced caspase-3/7-mediated death [PMID:33503978]. CDIP1 localizes to endosomes and is degraded through the lysosomal pathway, with CDK5-dependent phosphorylation at Ser-32 modulating its pro-apoptotic activity, and it induces a cytoprotective autophagic response prior to apoptosis [PMID:38928226]. Independently of its apoptotic role, CDIP1 functions as an alternative host cell-surface receptor for the Bacillus cereus pore-forming toxin hemolysin BL (HBL) in LITAF-deficient cells [PMID:32544461].","teleology":[{"year":2007,"claim":"Established CDIP1 as a p53 effector that engages the extrinsic apoptotic pathway, answering how p53 links genotoxic stress to caspase-8-dependent death.","evidence":"siRNA knockdown of CDIP1 and caspase-8, overexpression, TNF-α neutralization under genotoxic stress","pmids":["17599062"],"confidence":"High","gaps":["Did not define the molecular partners that physically transduce CDIP1 to caspase-8","Did not resolve subcellular site of action"]},{"year":2012,"claim":"Showed endogenous CDIP1 level sets the apoptosis-versus-survival decision in response to TNF-α, framing it as a tunable apoptotic rheostat in cancer cells.","evidence":"CDIP1 knockdown/overexpression with TNF-α treatment in vitro and in vivo","pmids":["22549949"],"confidence":"Medium","gaps":["Single lab","Mechanistic link to JNK activation not fully dissected"]},{"year":2013,"claim":"Identified the ER-membrane BAP31 interaction as the mechanism by which CDIP1 couples ER stress to mitochondrial apoptosis, defining its intrinsic-pathway role.","evidence":"Reciprocal Co-IP, CDIP1 knockout mice, BAX oligomerization and caspase-8/tBid activation assays under ER stress","pmids":["24139803"],"confidence":"High","gaps":["Structural basis of the CDIP1-BAP31 interaction unresolved","How ER stress triggers complex assembly not defined"]},{"year":2020,"claim":"Revealed a non-apoptotic function of CDIP1 as an alternative receptor for the B. cereus HBL toxin, distinct from its p53/apoptosis biology.","evidence":"Two sequential genome-wide CRISPR-Cas9 knockout screens, validation in LITAF-deficient KO cells and mice with lethal HBL challenge","pmids":["32544461"],"confidence":"High","gaps":["Binding interface between CDIP1 and HBL not mapped","Relationship between receptor role and apoptotic function unknown"]},{"year":2021,"claim":"Mapped CDIP1 into Ca2+-responsive membrane-trafficking machinery, identifying ALG-2, ESCRT-I, and VAPA/VAPB as partners and an FFAT-like motif as a determinant of its killing activity.","evidence":"Co-IP of GFP-CDIP1, FFAT-like motif mutagenesis, caspase-3/7 assays in HEK293 cells","pmids":["33503978"],"confidence":"Medium","gaps":["Single lab; reciprocal validation limited","How ESCRT-I/VAP engagement mechanistically drives caspase-3/7 activation unclear"]},{"year":2021,"claim":"Demonstrated Cdip1 is a silencing target of exosomal miR-21-5p, defining a route by which CDIP1 suppression confers cytoprotection in ischemic endothelium.","evidence":"Small RNA sequencing, in vitro ischemia/hypoxia model, rat MI model validation","pmids":["33391474"],"confidence":"Medium","gaps":["Predominantly phenotypic; downstream CDIP1 pathway not dissected in this context"]},{"year":2023,"claim":"Placed CDIP1 downstream of an ELK1/miR-31-5p axis, showing its 3'UTR silencing suppresses apoptosis while promoting CRC migration, invasion, and autophagy.","evidence":"Dual-luciferase 3'UTR reporter, CDIP1 siRNA, miR-31-5p and ELK1 manipulation, xenograft","pmids":["37547727"],"confidence":"Medium","gaps":["Single lab","Direct molecular effectors of CDIP1 in CRC not identified"]},{"year":2024,"claim":"Defined post-translational and trafficking control of CDIP1, showing endosomal localization, lysosomal degradation, CDK5/Ser-32 phosphoregulation, and autophagy as a cytoprotective brake on its apoptotic activity.","evidence":"Subcellular fractionation, Ser-32 phosphomimetic mutagenesis, CDK5 and VPS34 inhibitors, caspase assays in MCF-7 cells","pmids":["38928226"],"confidence":"Medium","gaps":["Direct kinase-substrate relationship of CDK5 on Ser-32 not biochemically reconstituted","Mechanism coupling endosomal/lysosomal handling to apoptotic output unclear"]},{"year":2025,"claim":"Extended CDIP1 3'UTR regulation to cardiac disease, showing miR-133b-3p silencing of CDIP1 suppresses Ang II-induced cardiomyocyte hypertrophy and apoptosis.","evidence":"Dual-luciferase 3'UTR reporter, miR-133b-3p overexpression, CDIP1 siRNA, Ang II hypertrophy model","pmids":["39943804"],"confidence":"Medium","gaps":["Single lab","CDIP1 effector pathway in cardiomyocytes not dissected"]},{"year":null,"claim":"How CDIP1's apoptotic signaling, membrane-trafficking interactions, and toxin-receptor function are mechanistically integrated, and what its structural organization is, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of CDIP1 or its complexes","Relationship between receptor and apoptotic roles unknown","Direct catalytic or enzymatic activity, if any, undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[3]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[6]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[1]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[6]}],"complexes":["ESCRT-I (TSG101/VPS37B/VPS37C)","CDIP1-BAP31 complex"],"partners":["BAP31","PDCD6","TSG101","VPS37B","VPS37C","VAPA","VAPB","BCL2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H305","full_name":"Cell death-inducing p53-target protein 1","aliases":["Cell death involved p53-target","Cell death-inducing protein","LITAF-like protein","Lipopolysaccharide-induced tumor necrosis factor-alpha-like protein","Transmembrane protein I1"],"length_aa":208,"mass_kda":21.9,"function":"Acts as an important p53/TP53-apoptotic effector. Regulates TNF-mediated apoptosis in a p53/TP53-dependent manner","subcellular_location":"Late endosome membrane; Lysosome membrane","url":"https://www.uniprot.org/uniprotkb/Q9H305/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDIP1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CDIP1","total_profiled":1310},"omim":[{"mim_id":"610503","title":"CELL DEATH-INDUCING p53 TARGET 1; CDIP1","url":"https://www.omim.org/entry/610503"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":159.5}],"url":"https://www.proteinatlas.org/search/CDIP1"},"hgnc":{"alias_symbol":["CDIP","LITAFL"],"prev_symbol":["C16orf5"]},"alphafold":{"accession":"Q9H305","domains":[{"cath_id":"-","chopping":"140-204","consensus_level":"medium","plddt":57.5498,"start":140,"end":204}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H305","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H305-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H305-F1-predicted_aligned_error_v6.png","plddt_mean":55.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDIP1","jax_strain_url":"https://www.jax.org/strain/search?query=CDIP1"},"sequence":{"accession":"Q9H305","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H305.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H305/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H305"}},"corpus_meta":[{"pmid":"33391474","id":"PMC_33391474","title":"Cardiac telocytes inhibit cardiac microvascular endothelial cell apoptosis through exosomal miRNA-21-5p-targeted cdip1 silencing to improve angiogenesis following myocardial infarction.","date":"2021","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/33391474","citation_count":147,"is_preprint":false},{"pmid":"24139803","id":"PMC_24139803","title":"CDIP1-BAP31 complex transduces apoptotic signals from endoplasmic reticulum to mitochondria under endoplasmic reticulum stress.","date":"2013","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/24139803","citation_count":83,"is_preprint":false},{"pmid":"17599062","id":"PMC_17599062","title":"CDIP, a novel pro-apoptotic gene, regulates TNFalpha-mediated apoptosis in a p53-dependent manner.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17599062","citation_count":36,"is_preprint":false},{"pmid":"32544461","id":"PMC_32544461","title":"Sequential CRISPR-Based Screens Identify LITAF and CDIP1 as the Bacillus cereus Hemolysin BL Toxin Host Receptors.","date":"2020","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/32544461","citation_count":25,"is_preprint":false},{"pmid":"37547727","id":"PMC_37547727","title":"Role of ELK1 in regulating colorectal cancer progression: miR-31-5p/CDIP1 axis in CRC pathogenesis.","date":"2023","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/37547727","citation_count":16,"is_preprint":false},{"pmid":"33503978","id":"PMC_33503978","title":"The Novel ALG-2 Target Protein CDIP1 Promotes Cell Death by Interacting with ESCRT-I and VAPA/B.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33503978","citation_count":15,"is_preprint":false},{"pmid":"33737835","id":"PMC_33737835","title":"IL-33 Promotes the Growth of Non-Small Cell Lung Cancer Cells Through Regulating miR-128-3p/CDIP1 Signalling Pathway.","date":"2021","source":"Cancer management and 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CDIP1 also upregulates TNF-α expression in a p53-dependent manner, establishing a p53→CDIP1→TNF-α apoptotic pathway activated by genotoxic stress.\",\n      \"method\": \"siRNA knockdown, overexpression, caspase-8 inhibition/knockdown, TNF-α neutralization, genotoxic stress assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal loss-of-function experiments (siRNA for CDIP1, caspase-8, TNF-α), pathway epistasis established, independently consistent results within the study\",\n      \"pmids\": [\"17599062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CDIP1 physically interacts with BAP31 at the ER membrane upon ER stress, and this interaction is required for BAP31 cleavage, BAP31-Bcl-2 association, and subsequent BAX oligomerization. The CDIP1–BAP31 complex recruits Bcl-2 and activates caspase-8 and truncated Bid (tBid), coupling ER-stress signals to mitochondrial apoptosis. Genetic knockout of CDIP1 in mice impairs ER-stress-mediated apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, CDIP1 knockout mice, caspase-8/tBid activation assays, BAX oligomerization assay, ER stress induction\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic KO in mice with defined phenotype, multiple orthogonal biochemical readouts in one study\",\n      \"pmids\": [\"24139803\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CDIP1 expression sensitizes cancer cells to TNF-α-induced apoptosis; endogenous CDIP1 expression determines whether cells undergo apoptosis versus survival in response to TNF-α, acting downstream of p53 and in the context of JNK activation.\",\n      \"method\": \"CDIP1 knockdown/overexpression, in vitro and in vivo cancer cell growth assays with TNF-α treatment\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single lab, loss-of-function and gain-of-function with defined cellular phenotype, in vitro and in vivo\",\n      \"pmids\": [\"22549949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LITAF and CDIP1 (LITAF-like protein) serve as host cell-surface receptors for the Bacillus cereus pore-forming toxin hemolysin BL (HBL); CDIP1 functions as an alternative HBL receptor in LITAF-deficient cells, identified by sequential genome-wide CRISPR-Cas9 knockout screens.\",\n      \"method\": \"Genome-wide CRISPR-Cas9 knockout screens (two sequential screens), LITAF-deficient cell lines and mice, lethal HBL challenge\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased genome-wide CRISPR screen replicated with a second screen, validated in KO cells and KO mice with defined resistance phenotype\",\n      \"pmids\": [\"32544461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CDIP1 interacts with ALG-2 (PDCD6) in a Ca2+-dependent manner. Via ALG-2 as an adaptor, CDIP1 associates preferentially with ESCRT-I complexes containing VPS37B or VPS37C (specifically TSG101-containing ESCRT-I). CDIP1 also binds VAPA and VAPB through an FFAT-like motif in its C-terminal region; mutations in this motif reduce CDIP1-induced cell death. Co-expression of ALG-2 and ESCRT-I enhances CDIP1-induced caspase-3/7-mediated cell death.\",\n      \"method\": \"Co-immunoprecipitation of GFP-CDIP1, mutagenesis of FFAT-like motif, caspase-3/7 activity assays, overexpression in HEK293 cells\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutagenesis validation, caspase activity assays, single lab with two orthogonal methods\",\n      \"pmids\": [\"33503978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"C16orf5 (CDIP1) is a novel gene at chromosome 16p13.3 encoding a 261-amino-acid protein with a proline-rich N-terminus and cysteine-rich C-terminus; computational analysis predicted nuclear localization.\",\n      \"method\": \"Northern blot, FISH, Southern blot with somatic cell hybrid panel, PSORTII prediction\",\n      \"journal\": \"Journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — localization is computational prediction only; expression data without functional validation\",\n      \"pmids\": [\"10570909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In MCF-7 breast cancer cells, CDIP1 is localized to endosomes and is degraded via the lysosomal pathway after adriamycin treatment. CDK5 inhibition (roscovitine) increases electrophoretic mobility of CDIP1, and a phosphomimetic mutation at Ser-32 increases CDIP1-induced apoptosis. CDIP1 expression induces autophagy prior to apoptosis, and inhibition of VPS34 (autophagy) with SAR405 reduces autophagy and promotes CDIP1-induced apoptosis, indicating autophagy acts as a cytoprotective response against CDIP1-driven apoptosis.\",\n      \"method\": \"Subcellular fractionation/localization, site-directed mutagenesis (Ser-32 phosphomimetic), CDK5 inhibitor treatment, autophagy inhibitor (SAR405/VPS34 inhibitor), caspase assays, Western blot\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis, pharmacological inhibition, and localization with functional consequences, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"38928226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CT exosomal miRNA-21-5p targets and silences Cdip1 mRNA in cardiac microvascular endothelial cells, reducing activated caspase-3 and inhibiting apoptosis under ischemic/hypoxic conditions.\",\n      \"method\": \"Small RNA sequencing, in vitro ischemia/hypoxia model, cellular and molecular validation in rat MI model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — miRNA targeting of CDIP1 validated in vitro and in vivo, but predominantly phenotypic with limited direct mechanistic dissection of CDIP1 pathway\",\n      \"pmids\": [\"33391474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ELK1 binds the miR-31-5p promoter to enhance its transcription; miR-31-5p binds the CDIP1 3'UTR (validated by dual-luciferase assay) and inhibits CDIP1 expression, thereby suppressing apoptosis and promoting CRC cell migration, invasion, and autophagy.\",\n      \"method\": \"Dual-luciferase reporter assay, siRNA knockdown of CDIP1, miR-31-5p overexpression/inhibition, ELK1 knockdown, in vivo xenograft\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — dual-luciferase reporter validates 3'UTR targeting, rescue experiments confirm CDIP1 as the functional downstream target, single lab\",\n      \"pmids\": [\"37547727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"miR-133b-3p directly targets CDIP1 3'UTR (validated by dual-luciferase reporter assay); overexpression of miR-133b-3p reduces CDIP1 expression and suppresses Ang II-induced cardiomyocyte hypertrophy and apoptosis, while CDIP1 silencing phenocopies this effect.\",\n      \"method\": \"Dual-luciferase reporter assay, miR-133b-3p overexpression, CDIP1 siRNA knockdown, Ang II cardiac hypertrophy model\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — dual-luciferase reporter validates direct targeting, loss-of-function with defined phenotype, single lab\",\n      \"pmids\": [\"39943804\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDIP1 is a p53-target pro-apoptotic protein that, upon genotoxic or ER stress, is upregulated and acts as a signal transducer linking the ER to mitochondrial apoptosis via direct interaction with BAP31 at the ER membrane (facilitating BAP31 cleavage, Bcl-2 recruitment, tBid/caspase-8 activation, and BAX oligomerization), promotes TNF-α upregulation to amplify extrinsic apoptotic signaling through caspase-8, interacts with ALG-2 in a Ca2+-dependent manner and with ESCRT-I (via VPS37B/C-containing complexes) and VAPA/VAPB (via an FFAT-like motif) to drive caspase-3/7-mediated death, is localized to endosomes and subject to lysosomal degradation (regulated by CDK5-dependent phosphorylation at Ser-32), and also functions as an alternative host-cell receptor for the Bacillus cereus pore-forming toxin HBL.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDIP1 is a p53-target pro-apoptotic protein that couples genotoxic and ER stress to programmed cell death through both extrinsic and intrinsic apoptotic routes [#0, #1]. As a transcriptional target of p53, CDIP1 drives caspase-8 cleavage and p53-dependent TNF-\\u03b1 upregulation, establishing a p53\\u2192CDIP1\\u2192TNF-\\u03b1 axis that sensitizes cells to TNF-\\u03b1-induced apoptosis [#0, #2]. Upon ER stress, CDIP1 physically associates with BAP31 at the ER membrane, an interaction required for BAP31 cleavage, BAP31-Bcl-2 association, caspase-8/tBid activation, and BAX oligomerization, thereby relaying ER-stress signals to mitochondrial apoptosis; genetic ablation of CDIP1 in mice impairs ER-stress-mediated death [#1]. CDIP1 further engages the Ca2+-binding protein ALG-2 (PDCD6) in a Ca2+-dependent manner, which adapts it to TSG101/VPS37B/VPS37C-containing ESCRT-I complexes, and binds VAPA/VAPB through a C-terminal FFAT-like motif whose mutation reduces CDIP1-induced caspase-3/7-mediated death [#4]. CDIP1 localizes to endosomes and is degraded through the lysosomal pathway, with CDK5-dependent phosphorylation at Ser-32 modulating its pro-apoptotic activity, and it induces a cytoprotective autophagic response prior to apoptosis [#6]. Independently of its apoptotic role, CDIP1 functions as an alternative host cell-surface receptor for the Bacillus cereus pore-forming toxin hemolysin BL (HBL) in LITAF-deficient cells [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established CDIP1 as a p53 effector that engages the extrinsic apoptotic pathway, answering how p53 links genotoxic stress to caspase-8-dependent death.\",\n      \"evidence\": \"siRNA knockdown of CDIP1 and caspase-8, overexpression, TNF-\\u03b1 neutralization under genotoxic stress\",\n      \"pmids\": [\"17599062\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular partners that physically transduce CDIP1 to caspase-8\", \"Did not resolve subcellular site of action\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed endogenous CDIP1 level sets the apoptosis-versus-survival decision in response to TNF-\\u03b1, framing it as a tunable apoptotic rheostat in cancer cells.\",\n      \"evidence\": \"CDIP1 knockdown/overexpression with TNF-\\u03b1 treatment in vitro and in vivo\",\n      \"pmids\": [\"22549949\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanistic link to JNK activation not fully dissected\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified the ER-membrane BAP31 interaction as the mechanism by which CDIP1 couples ER stress to mitochondrial apoptosis, defining its intrinsic-pathway role.\",\n      \"evidence\": \"Reciprocal Co-IP, CDIP1 knockout mice, BAX oligomerization and caspase-8/tBid activation assays under ER stress\",\n      \"pmids\": [\"24139803\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the CDIP1-BAP31 interaction unresolved\", \"How ER stress triggers complex assembly not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a non-apoptotic function of CDIP1 as an alternative receptor for the B. cereus HBL toxin, distinct from its p53/apoptosis biology.\",\n      \"evidence\": \"Two sequential genome-wide CRISPR-Cas9 knockout screens, validation in LITAF-deficient KO cells and mice with lethal HBL challenge\",\n      \"pmids\": [\"32544461\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface between CDIP1 and HBL not mapped\", \"Relationship between receptor role and apoptotic function unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapped CDIP1 into Ca2+-responsive membrane-trafficking machinery, identifying ALG-2, ESCRT-I, and VAPA/VAPB as partners and an FFAT-like motif as a determinant of its killing activity.\",\n      \"evidence\": \"Co-IP of GFP-CDIP1, FFAT-like motif mutagenesis, caspase-3/7 assays in HEK293 cells\",\n      \"pmids\": [\"33503978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reciprocal validation limited\", \"How ESCRT-I/VAP engagement mechanistically drives caspase-3/7 activation unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated Cdip1 is a silencing target of exosomal miR-21-5p, defining a route by which CDIP1 suppression confers cytoprotection in ischemic endothelium.\",\n      \"evidence\": \"Small RNA sequencing, in vitro ischemia/hypoxia model, rat MI model validation\",\n      \"pmids\": [\"33391474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Predominantly phenotypic; downstream CDIP1 pathway not dissected in this context\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Placed CDIP1 downstream of an ELK1/miR-31-5p axis, showing its 3'UTR silencing suppresses apoptosis while promoting CRC migration, invasion, and autophagy.\",\n      \"evidence\": \"Dual-luciferase 3'UTR reporter, CDIP1 siRNA, miR-31-5p and ELK1 manipulation, xenograft\",\n      \"pmids\": [\"37547727\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct molecular effectors of CDIP1 in CRC not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined post-translational and trafficking control of CDIP1, showing endosomal localization, lysosomal degradation, CDK5/Ser-32 phosphoregulation, and autophagy as a cytoprotective brake on its apoptotic activity.\",\n      \"evidence\": \"Subcellular fractionation, Ser-32 phosphomimetic mutagenesis, CDK5 and VPS34 inhibitors, caspase assays in MCF-7 cells\",\n      \"pmids\": [\"38928226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct kinase-substrate relationship of CDK5 on Ser-32 not biochemically reconstituted\", \"Mechanism coupling endosomal/lysosomal handling to apoptotic output unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended CDIP1 3'UTR regulation to cardiac disease, showing miR-133b-3p silencing of CDIP1 suppresses Ang II-induced cardiomyocyte hypertrophy and apoptosis.\",\n      \"evidence\": \"Dual-luciferase 3'UTR reporter, miR-133b-3p overexpression, CDIP1 siRNA, Ang II hypertrophy model\",\n      \"pmids\": [\"39943804\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"CDIP1 effector pathway in cardiomyocytes not dissected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDIP1's apoptotic signaling, membrane-trafficking interactions, and toxin-receptor function are mechanistically integrated, and what its structural organization is, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of CDIP1 or its complexes\", \"Relationship between receptor and apoptotic roles unknown\", \"Direct catalytic or enzymatic activity, if any, undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\"ESCRT-I (TSG101/VPS37B/VPS37C)\", \"CDIP1-BAP31 complex\"],\n    \"partners\": [\"BAP31\", \"PDCD6\", \"TSG101\", \"VPS37B\", \"VPS37C\", \"VAPA\", \"VAPB\", \"BCL2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}