{"gene":"TRAPPC9","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":2005,"finding":"TRAPPC9 (NIBP) physically interacts with NIK and IKK-beta (but not IKK-alpha or IKK-gamma), and overexpression potentiates TNF-alpha-induced NF-kappaB activation through increased phosphorylation of the IKK complex and its downstream substrates IkappaB-alpha and p65; siRNA knockdown reduces TNF-alpha-induced NF-kappaB activation, prevents NGF-induced neuronal differentiation, and decreases Bcl-xL expression in PC12 cells.","method":"Yeast two-hybrid screen, co-immunoprecipitation, siRNA knockdown, NF-kappaB reporter assay, immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, siRNA KD with defined cellular phenotypes, multiple orthogonal methods in single study; independently confirmed by subsequent papers","pmids":["15951441"],"is_preprint":false},{"year":2009,"finding":"Truncating mutations in TRAPPC9 cause autosomal-recessive intellectual disability with postnatal microcephaly; TRAPPC9 is highly expressed in postmitotic neurons of the cerebral cortex, and MRI of affected patients shows defects in axonal connectivity, suggesting roles in NF-kappaB activation and intracellular protein trafficking in postmitotic neurons.","method":"Homozygosity mapping, sequence analysis (nonsense mutation identification), expression analysis (in situ hybridization/immunohistochemistry), MRI","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with defined neurological phenotype, replicated independently in two papers (PMID 20004763 and 20004765)","pmids":["20004763","20004765"],"is_preprint":false},{"year":2011,"finding":"TRAPPC2 serves as an adaptor for mammalian TRAPP complex formation: TRAPPC2 binds to TRAPPII-specific subunit TRAPPC9, which in turn binds TRAPPC10; TRAPPC2 also binds TRAPPIII-specific subunit TRAPPC8 but not simultaneously with TRAPPC9. A disease-causing mutation in TRAPPC2 (D47Y) fails to interact with TRAPPC9 or TRAPPC8. Disease-causing deletional mutants of TRAPPC9 all fail to interact with TRAPPC2 and TRAPPC10.","method":"Co-immunoprecipitation in mammalian cells, domain-deletion mutagenesis, disease-mutant analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with multiple mutants providing mechanistic detail; multiple orthogonal validations within the study","pmids":["21858081"],"is_preprint":false},{"year":2012,"finding":"TRAPPC9 mediates the interaction between dynactin subunit p150(Glued) and COPII vesicles at the target membrane: TRAPPC9 binds directly to p150(Glued) via the same C-terminal domain of p150(Glued) that binds Sec23 and Sec24; TRAPPC9 inhibits the interaction between p150(Glued) and Sec23/Sec24 both in vitro and in vivo, suggesting TRAPPC9 uncouples p150(Glued) from the COPII coat and relays the vesicle-dynactin interaction at the ERGIC membrane.","method":"Co-immunoprecipitation, in vitro binding assay, overexpression competition assay, microtubule architecture analysis","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — direct in vitro binding assay plus in vivo Co-IP and competition experiments with multiple orthogonal methods","pmids":["22279557"],"is_preprint":false},{"year":2015,"finding":"Elevated NIBP/TRAPPC9 promotes tumorigenesis in breast and colon cancer cells via NF-kappaB signaling; endogenous NIBP binds specifically to phosphorylated IKK2 in a TNF-alpha-dependent manner, and NIBP knockdown transiently attenuates TNF-alpha-stimulated phosphorylation of IKK2/p65 and degradation of IkappaB-alpha, while NIBP overexpression enhances NF-kappaB activation and inhibits apoptosis.","method":"Lentiviral shRNA knockdown, overexpression, Co-immunoprecipitation of endogenous phospho-IKK2, NF-kappaB luciferase reporter, xenograft tumorigenesis assay","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 — Co-IP of endogenous proteins, reporter assay, in vivo xenograft, multiple orthogonal methods; mechanistically extends the NIBP-IKK2 interaction with phosphorylation dependence","pmids":["25704885"],"is_preprint":false},{"year":2013,"finding":"NIBP/TRAPPC9 is expressed in enteric neurons and its knockdown in enteric neuronal cells inhibits TNF-alpha-induced NF-kappaB activation and neuronal differentiation, whereas NIBP overexpression promotes it, establishing a functional role in enteric nervous system plasticity.","method":"Lentiviral shRNA knockdown and overexpression, NF-kappaB reporter assay, immunofluorescence co-localization, Western blot, RT-PCR","journal":"Neurogastroenterology and motility","confidence":"Medium","confidence_rationale":"Tier 2 — KD/OE with defined cellular phenotype; single lab, multiple methods","pmids":["24011459"],"is_preprint":false},{"year":2020,"finding":"Trappc9-deficient mice show behavioral deficits and postnatal brain growth delay; loss of Trappc9 compromises Rab11 activation in the brain and causes retardation of endocytic receptor recycling in neurons; pharmacological manipulation of dopamine D1/D2 receptors (which are imbalanced in Trappc9 null mice) improves cognitive performance, establishing TRAPPC9's role as a Rab GEF required for endocytic recycling in neurons.","method":"Trappc9 knockout mouse model, behavioral assays, Rab11 activation assay, endocytic recycling assay in neurons, pharmacological rescue","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and behavioral phenotypes, Rab11 activation assay, pharmacological rescue; multiple orthogonal methods","pmids":["33208359"],"is_preprint":false},{"year":2020,"finding":"Trappc9 null mice recapitulate the human TRAPPC9-deficiency syndrome (microcephaly, obesity, reduced social memory); heterozygous mice lacking the maternal allele (70% expression reduction) show pathology similar to homozygous mutants while paternal allele loss (30% reduction) is phenotypically normal, establishing a parent-of-origin imprinting effect where Trappc9 is expressed predominantly (~70%) from the maternally inherited allele.","method":"Trappc9 knockout mouse model, allele-specific expression analysis, behavioral phenotyping, brain volume measurement, food intake measurement","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — clean allele-specific KO with defined phenotypes; multiple orthogonal methods establishing imprinting and brain/metabolic roles","pmids":["32877400"],"is_preprint":false},{"year":2022,"finding":"TRAPPC9 deficiency causes N-glycosylation defects consistent with CDG type I; patient fibroblasts with biallelic TRAPPC9 missense variants show reduced TRAPPC9 protein, N-glycosylation defects, and tracer metabolomics reveals global metabolic changes including multiple glycosylation-related metabolites, with defects rescued by complementation with wild-type TRAPPC9.","method":"Exome sequencing, N-glycosylation analysis in blood and fibroblasts, tracer metabolomics, complementation with WT TRAPPC9, immunofluorescence","journal":"Genetics in medicine","confidence":"High","confidence_rationale":"Tier 1-2 — complementation rescue, metabolomics, multiple patient-derived fibroblast studies; novel mechanism linking TRAPPC9 to glycosylation","pmids":["35042660"],"is_preprint":false},{"year":2018,"finding":"TRAPPC9 is a subunit of mammalian TRAPPII complex involved in vesicle trafficking from the ER to the Golgi and in intra-Golgi transport; it modulates NF-kappaB activation and is required for normal brain development, with mutations causing intellectual disability.","method":"Review synthesizing Co-IP, knockdown, and genetic data from multiple primary studies","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 3 — review article summarizing established findings; cited as supporting context","pmids":["30272317"],"is_preprint":false}],"current_model":"TRAPPC9 (also known as NIBP) is a subunit of the mammalian TRAPPII complex that functions in ER-to-Golgi and intra-Golgi vesicle trafficking (partly by mediating the interaction between p150(Glued)/dynactin and COPII vesicles at the ERGIC membrane), acts as a GEF activator for Rab11 to support endocytic receptor recycling in neurons, and enhances NF-kappaB signaling by directly binding phosphorylated IKK-beta in a TNF-alpha-dependent manner; loss of TRAPPC9 in humans and mice causes microcephaly, intellectual disability, obesity, and N-glycosylation defects, while TRAPPC9 incorporation into the TRAPPII complex depends on TRAPPC2 acting as an adaptor."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing that TRAPPC9 participates in NF-κB signaling answered whether this uncharacterized protein had a role in inflammatory signal transduction: TRAPPC9 physically binds NIK and IKKβ and is required for TNF-α–induced NF-κB activation and NGF-driven neuronal differentiation.","evidence":"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, and NF-κB reporter assays in PC12 cells","pmids":["15951441"],"confidence":"High","gaps":["Mechanism by which TRAPPC9 enhances IKK phosphorylation was unresolved","Relationship to vesicle trafficking machinery not yet examined","In vivo neuronal requirement not tested"]},{"year":2009,"claim":"Identifying TRAPPC9 truncating mutations in families with intellectual disability and microcephaly established TRAPPC9 as essential for human brain development, linking its NF-κB and trafficking functions to a Mendelian disorder.","evidence":"Homozygosity mapping, nonsense mutation identification, expression analysis, and brain MRI in two independent consanguineous families","pmids":["20004763","20004765"],"confidence":"High","gaps":["Animal model to recapitulate human phenotype not yet available","Cellular mechanism underlying microcephaly unknown","Whether trafficking or NF-κB function drives pathology was unclear"]},{"year":2011,"claim":"Demonstrating that TRAPPC2 acts as an adaptor bridging TRAPPC9 to the core TRAPP complex, and that disease-causing mutations in either TRAPPC2 or TRAPPC9 disrupt this interaction, defined the assembly hierarchy of mammalian TRAPPII.","evidence":"Co-immunoprecipitation with domain-deletion and disease-mutant analysis in mammalian cells","pmids":["21858081"],"confidence":"High","gaps":["Stoichiometry and structural details of the TRAPPII assembly not resolved","Whether TRAPPC9-TRAPPC10 interaction is direct or TRAPPC2-dependent was not fully clarified"]},{"year":2012,"claim":"Showing that TRAPPC9 directly binds p150(Glued) and competitively displaces COPII coat subunits from dynactin answered how TRAPPII relays vesicle identity at the ERGIC membrane during ER-to-Golgi transport.","evidence":"In vitro binding assays, co-immunoprecipitation, and overexpression competition experiments","pmids":["22279557"],"confidence":"High","gaps":["Functional consequence of disrupting this handoff on cargo delivery not measured in vivo","Whether this mechanism operates in neurons specifically was untested"]},{"year":2015,"claim":"Demonstrating that endogenous TRAPPC9 binds specifically to phosphorylated IKKβ in a TNF-α–dependent manner refined the mechanism of NF-κB potentiation and connected elevated TRAPPC9 to oncogenic signaling.","evidence":"Co-immunoprecipitation of endogenous phospho-IKK2, NF-κB reporter, shRNA knockdown, and xenograft tumorigenesis assay in breast/colon cancer cells","pmids":["25704885"],"confidence":"High","gaps":["Structural basis for phospho-IKKβ selectivity unknown","Whether the NF-κB and trafficking functions of TRAPPC9 are separable was not addressed"]},{"year":2020,"claim":"Trappc9 knockout mice established that TRAPPC9 is a Rab11 GEF activator required for endocytic receptor recycling in neurons, directly linking TRAPPII trafficking function to the microcephaly/obesity phenotype and revealing an imprinting effect with predominant maternal-allele expression.","evidence":"Trappc9 KO mice with Rab11 activation assays, endocytic recycling assays in neurons, behavioral phenotyping, allele-specific expression analysis, and pharmacological rescue","pmids":["33208359","32877400"],"confidence":"High","gaps":["Whether Rab11 activation defect fully accounts for microcephaly or other GEFs compensate","Imprinting mechanism (epigenetic marks at the locus) not characterized","Relative contributions of NF-κB versus Rab11 dysfunction to neuronal pathology unresolved"]},{"year":2022,"claim":"Showing that TRAPPC9 deficiency causes CDG-I–like N-glycosylation defects, rescuable by wild-type complementation, expanded the functional repertoire beyond vesicle trafficking to glycosylation homeostasis.","evidence":"N-glycosylation analysis and tracer metabolomics in patient fibroblasts with biallelic TRAPPC9 variants, complementation rescue","pmids":["35042660"],"confidence":"High","gaps":["Whether glycosylation defects are secondary to Golgi trafficking disruption or reflect an independent TRAPPC9 function is unresolved","Impact of glycosylation defects on neuronal function not examined"]},{"year":null,"claim":"Key open questions remain: whether the NF-κB–potentiating and Rab11 GEF/trafficking functions of TRAPPC9 are structurally and functionally separable, what the structural basis of TRAPPII assembly and substrate specificity is, and how TRAPPC9 imprinting is regulated at the epigenetic level.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of mammalian TRAPPII including TRAPPC9","Separation-of-function alleles distinguishing NF-κB from trafficking roles not generated","Epigenetic regulation of TRAPPC9 imprinting not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,4,6]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,3]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,8]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,3,6,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,6,7]}],"complexes":["TRAPPII"],"partners":["TRAPPC2","TRAPPC10","IKBKB","DCTN1","RAB11A","MAP3K14"],"other_free_text":[]},"mechanistic_narrative":"TRAPPC9 is a TRAPPII complex subunit that integrates vesicle trafficking with NF-κB signaling and is essential for normal brain development. Within the TRAPPII complex, TRAPPC9 is recruited via TRAPPC2 acting as an adaptor and in turn binds TRAPPC10; at the ERGIC membrane, TRAPPC9 directly binds the dynactin subunit p150(Glued), competitively uncoupling it from COPII coat proteins Sec23/Sec24 to relay vesicle–dynactin interactions during ER-to-Golgi transport [PMID:21858081, PMID:22279557]. TRAPPC9 also functions as a Rab11 GEF activator required for endocytic receptor recycling in neurons, and it potentiates TNF-α–induced NF-κB signaling by binding phosphorylated IKKβ to enhance IKK complex activation [PMID:33208359, PMID:15951441, PMID:25704885]. Biallelic loss-of-function mutations in TRAPPC9 cause autosomal-recessive intellectual disability with postnatal microcephaly, obesity, and congenital disorder of glycosylation type I–like N-glycosylation defects; TRAPPC9 is predominantly expressed from the maternally inherited allele owing to genomic imprinting [PMID:20004763, PMID:32877400, PMID:35042660]."},"prefetch_data":{"uniprot":{"accession":"Q96Q05","full_name":"Trafficking protein particle complex subunit 9","aliases":["NIK- and IKBKB-binding protein","Tularik gene 1 protein"],"length_aa":1148,"mass_kda":128.5,"function":"Functions as an activator of NF-kappa-B through increased phosphorylation of the IKK complex. May function in neuronal cells differentiation. May play a role in vesicular transport from endoplasmic reticulum to Golgi","subcellular_location":"Golgi apparatus, cis-Golgi network; Endoplasmic reticulum; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96Q05/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAPPC9","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TRAPPC1","stoichiometry":0.2},{"gene":"TRAPPC2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRAPPC9","total_profiled":1310},"omim":[{"mim_id":"621140","title":"CONGENITAL DISORDER OF GLYCOSYLATION TYPE 1EE WITH OR WITHOUT IMMUNODEFICIENCY; CDG1EE","url":"https://www.omim.org/entry/621140"},{"mim_id":"618899","title":"MANNOSIDASE, ALPHA, CLASS 2B, MEMBER 2; MAN2B2","url":"https://www.omim.org/entry/618899"},{"mim_id":"614459","title":"TRANSMEMBRANE PROTEIN 138; TMEM138","url":"https://www.omim.org/entry/614459"},{"mim_id":"613277","title":"TRANSMEMBRANE PROTEIN 216; TMEM216","url":"https://www.omim.org/entry/613277"},{"mim_id":"613192","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 13; MRT13","url":"https://www.omim.org/entry/613192"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAPPC9"},"hgnc":{"alias_symbol":["IKBKBBP","NIBP","KIAA1882","T1","TRS120","MRT13"],"prev_symbol":[]},"alphafold":{"accession":"Q96Q05","domains":[{"cath_id":"3.40.50,3.40.50","chopping":"11-169","consensus_level":"high","plddt":90.5602,"start":11,"end":169},{"cath_id":"-","chopping":"441-533","consensus_level":"medium","plddt":91.5459,"start":441,"end":533},{"cath_id":"2.60.40,2.60.40","chopping":"540-559_588-692","consensus_level":"high","plddt":91.5122,"start":540,"end":692},{"cath_id":"2.60.40.10","chopping":"700-803_851-883","consensus_level":"high","plddt":86.55,"start":700,"end":883},{"cath_id":"2.60.40.10","chopping":"1015-1145","consensus_level":"high","plddt":82.2274,"start":1015,"end":1145},{"cath_id":"2.60.40","chopping":"888-950_966-1010","consensus_level":"high","plddt":84.4972,"start":888,"end":1010}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96Q05","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96Q05-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96Q05-F1-predicted_aligned_error_v6.png","plddt_mean":82.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAPPC9","jax_strain_url":"https://www.jax.org/strain/search?query=TRAPPC9"},"sequence":{"accession":"Q96Q05","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96Q05.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96Q05/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96Q05"}},"corpus_meta":[{"pmid":"11713532","id":"PMC_11713532","title":"The 7SK small nuclear RNA inhibits the CDK9/cyclin T1 kinase to control transcription.","date":"2001","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/11713532","citation_count":565,"is_preprint":false},{"pmid":"10727469","id":"PMC_10727469","title":"T1/ST2-deficient mice demonstrate the importance of T1/ST2 in developing primary T helper cell type 2 responses.","date":"2000","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/10727469","citation_count":426,"is_preprint":false},{"pmid":"14603320","id":"PMC_14603320","title":"Truncated TrkB-T1 mediates neurotrophin-evoked calcium signalling in glia cells.","date":"2003","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/14603320","citation_count":299,"is_preprint":false},{"pmid":"29550324","id":"PMC_29550324","title":"Native T1 and Extracellular Volume in Transthyretin Amyloidosis.","date":"2018","source":"JACC. 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A disease-causing mutation in TRAPPC2 (D47Y) fails to interact with TRAPPC9 or TRAPPC8. Disease-causing deletional mutants of TRAPPC9 all fail to interact with TRAPPC2 and TRAPPC10.\",\n      \"method\": \"Co-immunoprecipitation in mammalian cells, domain-deletion mutagenesis, disease-mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with multiple mutants providing mechanistic detail; multiple orthogonal validations within the study\",\n      \"pmids\": [\"21858081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRAPPC9 mediates the interaction between dynactin subunit p150(Glued) and COPII vesicles at the target membrane: TRAPPC9 binds directly to p150(Glued) via the same C-terminal domain of p150(Glued) that binds Sec23 and Sec24; TRAPPC9 inhibits the interaction between p150(Glued) and Sec23/Sec24 both in vitro and in vivo, suggesting TRAPPC9 uncouples p150(Glued) from the COPII coat and relays the vesicle-dynactin interaction at the ERGIC membrane.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assay, overexpression competition assay, microtubule architecture analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro binding assay plus in vivo Co-IP and competition experiments with multiple orthogonal methods\",\n      \"pmids\": [\"22279557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Elevated NIBP/TRAPPC9 promotes tumorigenesis in breast and colon cancer cells via NF-kappaB signaling; endogenous NIBP binds specifically to phosphorylated IKK2 in a TNF-alpha-dependent manner, and NIBP knockdown transiently attenuates TNF-alpha-stimulated phosphorylation of IKK2/p65 and degradation of IkappaB-alpha, while NIBP overexpression enhances NF-kappaB activation and inhibits apoptosis.\",\n      \"method\": \"Lentiviral shRNA knockdown, overexpression, Co-immunoprecipitation of endogenous phospho-IKK2, NF-kappaB luciferase reporter, xenograft tumorigenesis assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP of endogenous proteins, reporter assay, in vivo xenograft, multiple orthogonal methods; mechanistically extends the NIBP-IKK2 interaction with phosphorylation dependence\",\n      \"pmids\": [\"25704885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NIBP/TRAPPC9 is expressed in enteric neurons and its knockdown in enteric neuronal cells inhibits TNF-alpha-induced NF-kappaB activation and neuronal differentiation, whereas NIBP overexpression promotes it, establishing a functional role in enteric nervous system plasticity.\",\n      \"method\": \"Lentiviral shRNA knockdown and overexpression, NF-kappaB reporter assay, immunofluorescence co-localization, Western blot, RT-PCR\",\n      \"journal\": \"Neurogastroenterology and motility\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with defined cellular phenotype; single lab, multiple methods\",\n      \"pmids\": [\"24011459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Trappc9-deficient mice show behavioral deficits and postnatal brain growth delay; loss of Trappc9 compromises Rab11 activation in the brain and causes retardation of endocytic receptor recycling in neurons; pharmacological manipulation of dopamine D1/D2 receptors (which are imbalanced in Trappc9 null mice) improves cognitive performance, establishing TRAPPC9's role as a Rab GEF required for endocytic recycling in neurons.\",\n      \"method\": \"Trappc9 knockout mouse model, behavioral assays, Rab11 activation assay, endocytic recycling assay in neurons, pharmacological rescue\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and behavioral phenotypes, Rab11 activation assay, pharmacological rescue; multiple orthogonal methods\",\n      \"pmids\": [\"33208359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Trappc9 null mice recapitulate the human TRAPPC9-deficiency syndrome (microcephaly, obesity, reduced social memory); heterozygous mice lacking the maternal allele (70% expression reduction) show pathology similar to homozygous mutants while paternal allele loss (30% reduction) is phenotypically normal, establishing a parent-of-origin imprinting effect where Trappc9 is expressed predominantly (~70%) from the maternally inherited allele.\",\n      \"method\": \"Trappc9 knockout mouse model, allele-specific expression analysis, behavioral phenotyping, brain volume measurement, food intake measurement\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean allele-specific KO with defined phenotypes; multiple orthogonal methods establishing imprinting and brain/metabolic roles\",\n      \"pmids\": [\"32877400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRAPPC9 deficiency causes N-glycosylation defects consistent with CDG type I; patient fibroblasts with biallelic TRAPPC9 missense variants show reduced TRAPPC9 protein, N-glycosylation defects, and tracer metabolomics reveals global metabolic changes including multiple glycosylation-related metabolites, with defects rescued by complementation with wild-type TRAPPC9.\",\n      \"method\": \"Exome sequencing, N-glycosylation analysis in blood and fibroblasts, tracer metabolomics, complementation with WT TRAPPC9, immunofluorescence\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — complementation rescue, metabolomics, multiple patient-derived fibroblast studies; novel mechanism linking TRAPPC9 to glycosylation\",\n      \"pmids\": [\"35042660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"TRAPPC9 is a subunit of mammalian TRAPPII complex involved in vesicle trafficking from the ER to the Golgi and in intra-Golgi transport; it modulates NF-kappaB activation and is required for normal brain development, with mutations causing intellectual disability.\",\n      \"method\": \"Review synthesizing Co-IP, knockdown, and genetic data from multiple primary studies\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review article summarizing established findings; cited as supporting context\",\n      \"pmids\": [\"30272317\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAPPC9 (also known as NIBP) is a subunit of the mammalian TRAPPII complex that functions in ER-to-Golgi and intra-Golgi vesicle trafficking (partly by mediating the interaction between p150(Glued)/dynactin and COPII vesicles at the ERGIC membrane), acts as a GEF activator for Rab11 to support endocytic receptor recycling in neurons, and enhances NF-kappaB signaling by directly binding phosphorylated IKK-beta in a TNF-alpha-dependent manner; loss of TRAPPC9 in humans and mice causes microcephaly, intellectual disability, obesity, and N-glycosylation defects, while TRAPPC9 incorporation into the TRAPPII complex depends on TRAPPC2 acting as an adaptor.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TRAPPC9 is a TRAPPII complex subunit that integrates vesicle trafficking with NF-κB signaling and is essential for normal brain development. Within the TRAPPII complex, TRAPPC9 is recruited via TRAPPC2 acting as an adaptor and in turn binds TRAPPC10; at the ERGIC membrane, TRAPPC9 directly binds the dynactin subunit p150(Glued), competitively uncoupling it from COPII coat proteins Sec23/Sec24 to relay vesicle–dynactin interactions during ER-to-Golgi transport [PMID:21858081, PMID:22279557]. TRAPPC9 also functions as a Rab11 GEF activator required for endocytic receptor recycling in neurons, and it potentiates TNF-α–induced NF-κB signaling by binding phosphorylated IKKβ to enhance IKK complex activation [PMID:33208359, PMID:15951441, PMID:25704885]. Biallelic loss-of-function mutations in TRAPPC9 cause autosomal-recessive intellectual disability with postnatal microcephaly, obesity, and congenital disorder of glycosylation type I–like N-glycosylation defects; TRAPPC9 is predominantly expressed from the maternally inherited allele owing to genomic imprinting [PMID:20004763, PMID:32877400, PMID:35042660].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that TRAPPC9 participates in NF-κB signaling answered whether this uncharacterized protein had a role in inflammatory signal transduction: TRAPPC9 physically binds NIK and IKKβ and is required for TNF-α–induced NF-κB activation and NGF-driven neuronal differentiation.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, siRNA knockdown, and NF-κB reporter assays in PC12 cells\",\n      \"pmids\": [\"15951441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which TRAPPC9 enhances IKK phosphorylation was unresolved\", \"Relationship to vesicle trafficking machinery not yet examined\", \"In vivo neuronal requirement not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identifying TRAPPC9 truncating mutations in families with intellectual disability and microcephaly established TRAPPC9 as essential for human brain development, linking its NF-κB and trafficking functions to a Mendelian disorder.\",\n      \"evidence\": \"Homozygosity mapping, nonsense mutation identification, expression analysis, and brain MRI in two independent consanguineous families\",\n      \"pmids\": [\"20004763\", \"20004765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Animal model to recapitulate human phenotype not yet available\", \"Cellular mechanism underlying microcephaly unknown\", \"Whether trafficking or NF-κB function drives pathology was unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrating that TRAPPC2 acts as an adaptor bridging TRAPPC9 to the core TRAPP complex, and that disease-causing mutations in either TRAPPC2 or TRAPPC9 disrupt this interaction, defined the assembly hierarchy of mammalian TRAPPII.\",\n      \"evidence\": \"Co-immunoprecipitation with domain-deletion and disease-mutant analysis in mammalian cells\",\n      \"pmids\": [\"21858081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural details of the TRAPPII assembly not resolved\", \"Whether TRAPPC9-TRAPPC10 interaction is direct or TRAPPC2-dependent was not fully clarified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showing that TRAPPC9 directly binds p150(Glued) and competitively displaces COPII coat subunits from dynactin answered how TRAPPII relays vesicle identity at the ERGIC membrane during ER-to-Golgi transport.\",\n      \"evidence\": \"In vitro binding assays, co-immunoprecipitation, and overexpression competition experiments\",\n      \"pmids\": [\"22279557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of disrupting this handoff on cargo delivery not measured in vivo\", \"Whether this mechanism operates in neurons specifically was untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating that endogenous TRAPPC9 binds specifically to phosphorylated IKKβ in a TNF-α–dependent manner refined the mechanism of NF-κB potentiation and connected elevated TRAPPC9 to oncogenic signaling.\",\n      \"evidence\": \"Co-immunoprecipitation of endogenous phospho-IKK2, NF-κB reporter, shRNA knockdown, and xenograft tumorigenesis assay in breast/colon cancer cells\",\n      \"pmids\": [\"25704885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for phospho-IKKβ selectivity unknown\", \"Whether the NF-κB and trafficking functions of TRAPPC9 are separable was not addressed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Trappc9 knockout mice established that TRAPPC9 is a Rab11 GEF activator required for endocytic receptor recycling in neurons, directly linking TRAPPII trafficking function to the microcephaly/obesity phenotype and revealing an imprinting effect with predominant maternal-allele expression.\",\n      \"evidence\": \"Trappc9 KO mice with Rab11 activation assays, endocytic recycling assays in neurons, behavioral phenotyping, allele-specific expression analysis, and pharmacological rescue\",\n      \"pmids\": [\"33208359\", \"32877400\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rab11 activation defect fully accounts for microcephaly or other GEFs compensate\", \"Imprinting mechanism (epigenetic marks at the locus) not characterized\", \"Relative contributions of NF-κB versus Rab11 dysfunction to neuronal pathology unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showing that TRAPPC9 deficiency causes CDG-I–like N-glycosylation defects, rescuable by wild-type complementation, expanded the functional repertoire beyond vesicle trafficking to glycosylation homeostasis.\",\n      \"evidence\": \"N-glycosylation analysis and tracer metabolomics in patient fibroblasts with biallelic TRAPPC9 variants, complementation rescue\",\n      \"pmids\": [\"35042660\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether glycosylation defects are secondary to Golgi trafficking disruption or reflect an independent TRAPPC9 function is unresolved\", \"Impact of glycosylation defects on neuronal function not examined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions remain: whether the NF-κB–potentiating and Rab11 GEF/trafficking functions of TRAPPC9 are structurally and functionally separable, what the structural basis of TRAPPII assembly and substrate specificity is, and how TRAPPC9 imprinting is regulated at the epigenetic level.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of mammalian TRAPPII including TRAPPC9\", \"Separation-of-function alleles distinguishing NF-κB from trafficking roles not generated\", \"Epigenetic regulation of TRAPPC9 imprinting not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 4, 6]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 3, 6, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 6, 7]}\n    ],\n    \"complexes\": [\n      \"TRAPPII\"\n    ],\n    \"partners\": [\n      \"TRAPPC2\",\n      \"TRAPPC10\",\n      \"IKBKB\",\n      \"DCTN1\",\n      \"RAB11A\",\n      \"MAP3K14\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}