{"gene":"CC2D1A","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2003,"finding":"Freud-1 (CC2D1A) was cloned as a novel DNA-binding protein that binds a 14 bp 5'-repressor element (FRE) in the 5-HT1A receptor gene promoter and mediates transcriptional repression. An intact C2/CalB calcium/phospholipid-binding domain was required for repression. Calcium-dependent signaling blocked Freud-1–FRE binding, and inhibitors of calmodulin or CaM-dependent protein kinase reversed this calcium-mediated inhibition. Overexpression repressed the 5-HT1A promoter and decreased 5-HT1A receptor protein, while antisense to Freud-1 derepressed it.","method":"DNA-binding assays, promoter-reporter assays, antisense knockdown, CalB domain mutagenesis, immunofluorescence co-localization","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (DNA binding, reporter assay, domain mutagenesis, antisense knockdown) in a single focused study with clear functional readouts","pmids":["12917378"],"is_preprint":false},{"year":2007,"finding":"Freud-1/CC2D1A binds a conserved intronic element (D2-DRE) in the human dopamine D2 receptor (DRD2) gene and represses its transcription. Recombinant Freud-1 bound D2-DRE specifically; endogenous Freud-1 occupancy was confirmed by chromatin immunoprecipitation. siRNA knockdown of Freud-1 upregulated DRD2 mRNA and binding sites. A SNP (rs2734836) adjacent to D2-DRE conferred allele-specific Freud-1 binding and differential repression.","method":"Electrophoretic mobility shift assay, chromatin immunoprecipitation, siRNA knockdown, transcriptional reporter assay, receptor-binding assay","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP confirms in-cell occupancy, siRNA establishes functional necessity, reporter assay confirms repression; multiple orthogonal methods in single study","pmids":["17535813"],"is_preprint":false},{"year":2007,"finding":"Human CC2D1A/Freud-1 encodes short and long isoforms; the long isoform (Freud-1L) is predominant in human cells and is enriched in the nuclear fraction. Nuclear export of Freud-1L is CRM1/exportin-1-dependent. Freud-1L binds the 5-HT1A dual repressor element in vitro and is bound to it in chromatin as shown by ChIP with isoform-specific antibodies.","method":"Subcellular fractionation, CRM1-inhibitor treatment, in vitro DNA-binding assay, chromatin immunoprecipitation","journal":"The European Journal of Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and fractionation provide two orthogonal methods; single lab","pmids":["17714190"],"is_preprint":false},{"year":2008,"finding":"Freud-1/Aki1 (CC2D1A) functions as a receptor-selective scaffold for the PDK1/Akt pathway. It associates with PDK1 and Akt, induces PDK1/Akt complex formation, and regulates Akt activation in a concentration-dependent biphasic manner. It also associates with EGF receptor upon EGF stimulation. Freud-1/Aki1 gene silencing decreased Akt kinase activity, induced apoptosis, and increased chemosensitivity. The scaffold function was selective for EGF, not IGF-1, signaling.","method":"Co-immunoprecipitation, siRNA knockdown, kinase activity assay, apoptosis assay, clonogenic assay","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, kinase assay, and functional siRNA knockdown with multiple readouts in one study","pmids":["18662999"],"is_preprint":false},{"year":2010,"finding":"CC2D1A activates NF-κB through the canonical IKK pathway. Activation requires its C2 domain. The pathway dependence was defined by genetic epistasis: CC2D1A-induced NF-κB activation required Ubc13, TRAF2, TAK1, and the IKK complex. The deubiquitinase CYLD negatively regulates CC2D1A-mediated NF-κB activation.","method":"Transcriptional reporter assay, domain deletion/mutagenesis, dominant-negative and siRNA epistasis experiments","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — C2 domain mutagenesis combined with genetic epistasis across multiple pathway components; rigorous mechanistic dissection","pmids":["20529849"],"is_preprint":false},{"year":2010,"finding":"TAPE/CC2D1A is an innate immune regulator that colocalizes with endosomal marker Rab5 and lysosomal marker LAMP1, placing it in endolysosomes. It activates TBK1, NF-κB, and ERK pathways leading to IFN-β and inflammatory cytokine induction. Knockdown selectively impairs TLR3 and endocytic TLR4 pathways to IFN-β. TAPE physically interacts and synergizes with TRIF; TAPE acts upstream of TRIF in TLR3 signaling.","method":"Immunofluorescence co-localization, co-immunoprecipitation, siRNA knockdown, reporter assay, cytokine ELISA","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — subcellular localization by imaging, physical interaction by Co-IP, and functional epistasis by siRNA with multiple pathway readouts","pmids":["21189260"],"is_preprint":false},{"year":2011,"finding":"Cc2d1a knockout mice die soon after birth apparently due to respiratory failure not explained by peripheral structural defects. Cc2d1a-deficient cortical neurons show a robust increase in the pace of maturation of evoked synaptic responses and synaptic vesicle trafficking. Reintroduction of full-length Cc2d1a, but not a C2-domain-deletion mutant, rescued these synaptic anomalies, demonstrating that the C2 domain is required for Cc2d1a's role in controlling synaptic functional maturation.","method":"Knockout mouse generation, electrophysiology of cortical neurons, rescue by lentiviral expression of full-length vs. C2-deletion mutant","journal":"Journal of Neurophysiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — KO with defined electrophysiological phenotype and domain-specific rescue experiment","pmids":["21273312"],"is_preprint":false},{"year":2012,"finding":"CC2D1A directly binds CHMP4B (ESCRT-III) with nanomolar affinity forming a 1:1 complex. The binding site on CC2D1A maps to a short linear sequence within the third DM14 domain; the binding site on CHMP4B maps to its N-terminal helical hairpin as defined by crystal structure and surface plasmon resonance mutagenesis. CC2D1A binding prevents CHMP4B polymerization in vitro, suggesting CC2D1A acts as a negative regulator of CHMP4B function. Mutations disrupting the CC2D1A-binding surface on CHMP4B abolished the dominant-negative effect of CHMP4B C-terminal truncation on HIV-1 budding.","method":"Pulldown, surface plasmon resonance (affinity measurement), crystal structure of CHMP4B helical hairpin, in vitro polymerization assay, HIV-1 budding assay with mutagenesis","journal":"Journal of Molecular Biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, SPR-based affinity mapping, in vitro polymerization assay, and mutagenesis with functional HIV budding readout all in one study","pmids":["22406677"],"is_preprint":false},{"year":2012,"finding":"CC2D1A and CC2D1B bind to the core domain of CHMP4B proteins in human cells and are found in high-molecular-weight complexes with CHMP4 in vivo. The DM14 domains constitute novel CHMP4-binding modules; the highest-affinity DM14 domain alone inhibits ALIX-dependent HIV-1 budding by sequestering CHMP4. Overexpression of CC2D1A inhibited HIV-1 release; siRNA against CC2D1A or CC2D1B increased budding under certain conditions, consistent with a role in restraining CHMP4 polymerization.","method":"Co-immunoprecipitation from human cells, domain mapping, HIV-1 budding assay, siRNA knockdown","journal":"Journal of Virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain mapping, gain- and loss-of-function with HIV budding readout; replicates findings of PMID 22406677 with independent methods","pmids":["22258254"],"is_preprint":false},{"year":2012,"finding":"TAPE/CC2D1A physically interacts with RIG-I, MDA5, and IPS-1 (MAVS) and activates the IFN-β promoter. TAPE knockdown impairs IFN-β activation induced by RLRs but not by IPS-1 overexpression, placing TAPE upstream of IPS-1 in the RIG-I-like receptor pathway. TAPE-deficient cells show defective cytokine production and antiviral responses upon RNA virus infection.","method":"Co-immunoprecipitation, siRNA knockdown and knockout, reporter assay, cytokine measurement, viral infection assay","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP establishes physical interactions, genetic epistasis with siRNA/KO places TAPE upstream of IPS-1, functional antiviral readout confirmed","pmids":["22833682"],"is_preprint":false},{"year":2013,"finding":"CC2D1A co-localizes with PDE4D in the cytosol before cAMP stimulation and at the cell periphery after stimulation; full-length CC2D1A is required for this translocation. In CC2D1A mutant cells lacking three of four DM14 domains, the complex fails to translocate and PDE4D Ser126 is constitutively phosphorylated by PKA, leading to PDE4D hyperactivity and defective downstream CREB phosphorylation. Rolipram (PDE4 inhibitor) restored CREB phosphorylation in mutant cells.","method":"Immunofluorescence co-localization, phospho-specific western blot, pharmacological rescue with rolipram, mouse embryonic fibroblasts from CC2D1A mutant mice","journal":"Cell Communication and Signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — localization tied to functional consequence, domain-deletion evidence, pharmacological rescue; single lab","pmids":["23826796"],"is_preprint":false},{"year":2014,"finding":"Cc2d1a gain- and loss-of-function both increase NF-κB activation in neurons, revealing a homeostatic role. Cc2d1a knockdown in neurons reduces dendritic complexity and increases NF-κB activity. Inhibiting NF-κB activity rescued the dendritic complexity defect caused by Cc2d1a depletion, establishing NF-κB dysregulation as the pathway mechanism downstream of CC2D1A loss in neurons.","method":"siRNA knockdown in neurons, NF-κB reporter assay, neuronal morphology analysis, pharmacological NF-κB inhibition rescue","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function combined with pharmacological epistasis rescue; multiple orthogonal readouts","pmids":["25066123"],"is_preprint":false},{"year":2015,"finding":"CC2D1A (mammalian ortholog of Drosophila Lgd) and its interaction partner CHMP4B localize to endosomes in MEF cells when VPS4 activity is reduced, indicating CC2D1A cycles between cytosol and endosomal membrane. Cc2d1a knockout MEF cells show increased average endosome size, indicating a defect in endosomal morphogenesis. However, CC2D1A loss does not affect Notch signaling in intestinal-specific knockout mice, and centrosomal function was not confirmed.","method":"Conditional knockout mice, electron microscopy of endosomes, immunofluorescence co-localization with VPS4 dominant-negative, Notch reporter (Hes1-emGFP) analysis","journal":"PLoS Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — EM morphometry of endosomes in KO cells, live localization with VPS4 perturbation; also reports negative result for Notch signaling","pmids":["26720614"],"is_preprint":false},{"year":2016,"finding":"CC2D1A binds to CHMP4B polymers formed on endosomes and regulates the endosomal sorting pathway. Depletion of CC2D1A and CC2D1B accelerates lysosomal degradation of EGFR and TLR4 by promoting their sorting to intraluminal vesicles (ILVs), and rapidly terminates ERK1/2 downstream signaling.","method":"siRNA knockdown, receptor degradation assay, western blot for downstream signaling (ERK1/2), immunofluorescence","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with receptor degradation and signaling readouts; single lab, no rescue experiment","pmids":["27769858"],"is_preprint":false},{"year":2017,"finding":"Conditional knockout of Freud-1/Cc2d1a specifically in 5-HT neurons in adult mice (cF1ko) increases 5-HT1A autoreceptor protein, binding, and hypothermic response, reduces 5-HT content and raphe neuronal activity, and produces anxiety- and depression-like behavior resistant to fluoxetine. Conditional double knockout removing both Freud-1 and 5-HT1A in 5-HT neurons abolished the anxiety/depression-like phenotype of Freud-1 knockout, demonstrating that the behavioral effects of Freud-1 loss are mediated through 5-HT1A autoreceptor upregulation.","method":"Conditional knockout mouse (Cre/loxP in 5-HT neurons), receptor autoradiography, 5-HT neurochemistry, behavioral testing, conditional double knockout epistasis","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with double-KO epistasis definitively places Freud-1 upstream of 5-HT1A autoreceptor regulation; multiple biochemical and behavioral readouts","pmids":["29101244"],"is_preprint":false},{"year":2017,"finding":"Forebrain-specific postnatal conditional deletion of Cc2d1a (CamKIIa-Cre) in mice produces abnormal cortical dendrite organization, reduced dendritic spine density, deficits in LTP/neuronal plasticity, and impaired spatial learning and memory, as well as reduced sociability, hyperactivity, anxiety, and excessive grooming, recapitulating human CC2D1A loss-of-function phenotypes.","method":"Conditional knockout mouse, neuronal morphology analysis (Golgi/immunofluorescence), electrophysiology (LTP), behavioral battery","journal":"Cerebral Cortex","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined morphological and electrophysiological phenotypes plus behavioral characterization; multiple orthogonal readouts","pmids":["26826102"],"is_preprint":false},{"year":2019,"finding":"Conditional deletion of Cc2d1a from excitatory neurons impairs LTP at CA1 synapses and object location memory. Loss of CC2D1A results in reduced SENP1 and SENP3 expression, increasing Rac1 SUMOylation and thereby elevating basal Rac1 activity. Partial pharmacological blockade of Rac1 rescued both LTP and memory deficits in Cc2d1a cKO mice, establishing Rac1 hyperactivation as a downstream mechanism.","method":"Conditional knockout mouse (CamKIIa-Cre), LTP electrophysiology, Rac1 activity pull-down assay, western blot for SENP1/SENP3/SUMOylated Rac1, pharmacological rescue with Rac1 inhibitor","journal":"The Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical pathway dissection (SENP1/3, SUMOylated Rac1) combined with pharmacological epistasis rescue of electrophysiological and behavioral phenotypes","pmids":["30992372"],"is_preprint":false},{"year":2019,"finding":"CC2D1A promotes chemotherapy resistance in ovarian cancer cells. shRNA-mediated knockdown of CC2D1A in cisplatin-resistant ovarian cancer cell lines increased sensitivity to cisplatin and paclitaxel in clonogenic assays, and xenograft mice with CC2D1A knockdown survived significantly longer under chemotherapy treatment.","method":"shRNA knockdown, cell viability/clonogenic assay, xenograft mouse model","journal":"Frontiers in Oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular and in vivo phenotype; pathway mechanism not fully defined; single lab","pmids":["31632917"],"is_preprint":false},{"year":2020,"finding":"Monoallelic loss-of-function mutations in CC2D1A are associated with heterotaxy and ciliary dysfunction. In zebrafish, TALEN-mediated somatic and germline cc2d1a knockout produced heterotaxy of cardiovascular and gastrointestinal organs and defective cilia (reduced acetylated α-tubulin staining). Phenotypes were rescued by wild-type cc2d1a mRNA but not by mRNA encoding the patient mutations, confirming a loss-of-function mechanism for CC2D1A in left-right patterning and ciliogenesis.","method":"TALEN zebrafish knockout, whole-mount immunostaining of acetylated α-tubulin, mRNA rescue experiment","journal":"Circulation: Genomic and Precision Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — zebrafish KO with morphological phenotype and allele-specific mRNA rescue; single lab, ortholog model","pmids":["33196317"],"is_preprint":false},{"year":2021,"finding":"Cc2d1a/Freud-1 hippocampal knockdown via AAV-shRNA upregulates 5-HT and 5-HIAA levels, reduces CREB mRNA and CREB phosphorylation, upregulates cFos mRNA, and enhances proBDNF protein expression, placing CC2D1A in a pathway that regulates CREB and BDNF signaling in addition to 5-HT1A receptor control.","method":"AAV-mediated shRNA knockdown in vivo, western blot, qRT-PCR, HPLC for serotonin metabolites, behavioral tests","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown with multiple biochemical readouts; single lab, no rescue","pmids":["34948116"],"is_preprint":false},{"year":2021,"finding":"Loss of CC2D1A in glutamatergic neurons (Emx1-Cre) in mice leads to autistic-like phenotypes including self-injurious repetitive grooming and aberrant social interactions, decreased complexity of mPFC pyramidal neuron dendritic arbors, and increased synaptic excitation/inhibition (E/I) ratio. Chronic minocycline treatment rescued behavioral, morphological, and E/I ratio abnormalities, identifying inflammatory/E/I imbalance as a mechanistic pathway.","method":"Emx1-Cre conditional knockout, dendritic morphology analysis, electrophysiology (E/I ratio in mPFC), behavioral battery, pharmacological rescue with minocycline","journal":"Neurotherapeutics","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with morphological, electrophysiological, and behavioral phenotypes rescued by pharmacological intervention; multiple orthogonal readouts","pmids":["34132974"],"is_preprint":false}],"current_model":"CC2D1A (Freud-1/TAPE/Aki1) is a multi-functional scaffold/regulatory protein that: (1) acts as a calcium-regulated transcriptional repressor of the 5-HT1A receptor and dopamine D2 receptor genes by binding specific promoter elements via its DM14 and C2 domains; (2) scaffolds the PDK1/Akt complex downstream of EGF receptor; (3) activates NF-κB through the canonical IKK pathway (requiring its C2 domain and TRAF2/TAK1/Ubc13) while also maintaining homeostatic NF-κB levels in neurons; (4) resides in endolysosomes and links TLR3/TLR4 and RIG-I-like receptors to IFN-β induction upstream of TRIF/IPS-1; (5) regulates ESCRT-III function by directly binding the N-terminal hairpin of CHMP4B with nanomolar affinity through its DM14 domains, preventing CHMP4B polymerization and controlling ILV sorting and receptor degradation; (6) co-localizes with PDE4D and regulates cAMP homeostasis and downstream CREB phosphorylation; and (7) in neurons, loss of CC2D1A causes Rac1 hyperactivation (via reduced SENP1/SENP3-mediated de-SUMOylation of Rac1), leading to deficits in dendritic complexity, synaptic plasticity, and cognitive/social behavior."},"narrative":{"mechanistic_narrative":"CC2D1A (Freud-1/TAPE/Aki1) is a multifunctional DM14- and C2-domain scaffold that operates as both a calcium-regulated transcriptional repressor and a cytoplasmic signaling regulator across neuronal, immune, and membrane-trafficking contexts [PMID:12917378, PMID:20529849, PMID:22406677]. As a transcriptional repressor it binds a 14-bp repressor element in the 5-HT1A receptor promoter and an intronic element in the dopamine D2 receptor gene, mediating calcium-sensitive repression through its C2/CalB domain; calcium signaling and CaM/CaMK activity relieve this repression [PMID:12917378, PMID:17535813]. The predominant long isoform is nuclear and shuttles via CRM1-dependent export [PMID:17714190]. In the cytoplasm CC2D1A scaffolds the PDK1/Akt complex downstream of activated EGFR [PMID:18662999], activates canonical NF-κB through a TRAF2/Ubc13/TAK1/IKK cascade requiring its C2 domain [PMID:20529849], and—localizing to endolysosomes—links TLR3, endocytic TLR4, and RIG-I-like receptors (RIG-I, MDA5) to IFN-β induction upstream of TRIF and IPS-1/MAVS [PMID:21189260, PMID:22833682]. Through its DM14 domains CC2D1A directly binds the N-terminal hairpin of the ESCRT-III subunit CHMP4B with nanomolar affinity, preventing CHMP4B polymerization and thereby restraining intraluminal-vesicle sorting and lysosomal degradation of receptors such as EGFR and TLR4 [PMID:22406677, PMID:22258254, PMID:27769858]. In neurons CC2D1A controls dendritic complexity, synaptic maturation, and plasticity: it maintains homeostatic NF-κB levels, and its loss drives Rac1 hyperactivation through reduced SENP1/SENP3-mediated de-SUMOylation, with pharmacological inhibition of NF-κB or Rac1 rescuing the resulting deficits [PMID:21273312, PMID:25066123, PMID:30992372]. Conditional knockout mice recapitulate human CC2D1A loss-of-function neurodevelopmental phenotypes including impaired learning, reduced sociability, repetitive grooming, and altered excitation/inhibition balance [PMID:26826102, PMID:34132974]. CC2D1A loss also causes heterotaxy and ciliary defects in zebrafish via a loss-of-function mechanism [PMID:33196317].","teleology":[{"year":2003,"claim":"Established CC2D1A's founding identity as a sequence-specific, calcium-regulated transcriptional repressor, explaining how 5-HT1A receptor levels are set.","evidence":"DNA-binding, promoter-reporter, antisense knockdown, and CalB-domain mutagenesis on the 5-HT1A promoter","pmids":["12917378"],"confidence":"High","gaps":["Mechanism coupling calcium/CaMK signaling to loss of FRE binding not structurally defined","Did not address non-transcriptional functions"]},{"year":2007,"claim":"Extended the repressor role to a second neurotransmitter receptor gene (DRD2) and showed allele-specific regulation, establishing CC2D1A as a broader regulator of monoaminergic receptor expression.","evidence":"EMSA, ChIP, siRNA, and reporter assays on the DRD2 intronic D2-DRE plus SNP analysis","pmids":["17535813"],"confidence":"High","gaps":["Shared sequence determinants of FRE vs D2-DRE recognition not defined"]},{"year":2007,"claim":"Resolved isoform usage and showed the nuclear long isoform is the chromatin-engaged repressor with CRM1-dependent export, clarifying where repression occurs.","evidence":"Subcellular fractionation, CRM1 inhibition, in vitro DNA binding, isoform-specific ChIP","pmids":["17714190"],"confidence":"Medium","gaps":["Single lab","Functional role of nuclear export in regulating repression not established"]},{"year":2008,"claim":"Revealed a cytoplasmic scaffolding function distinct from transcription, coupling CC2D1A to EGFR-driven PDK1/Akt survival signaling.","evidence":"Reciprocal Co-IP, kinase assays, siRNA with apoptosis and clonogenic readouts","pmids":["18662999"],"confidence":"High","gaps":["Domain required for PDK1/Akt scaffolding not mapped","Basis of EGF- vs IGF-1 selectivity unknown"]},{"year":2010,"claim":"Defined CC2D1A as a C2-domain-dependent activator of canonical NF-κB and placed it within a defined ubiquitin-kinase cascade.","evidence":"Reporter assays with domain mutagenesis and genetic epistasis across Ubc13/TRAF2/TAK1/IKK plus CYLD","pmids":["20529849"],"confidence":"High","gaps":["Direct molecular target of CC2D1A within the cascade not identified","How C2 domain engages the pathway unclear"]},{"year":2010,"claim":"Identified CC2D1A/TAPE as an endolysosomal innate immune adaptor linking endosomal TLRs to IFN-β upstream of TRIF.","evidence":"Rab5/LAMP1 co-localization, TRIF Co-IP, siRNA epistasis with cytokine readouts","pmids":["21189260"],"confidence":"High","gaps":["Direct binding interface with TRIF not mapped","Relationship to NF-κB scaffolding role not integrated"]},{"year":2011,"claim":"Demonstrated organismal essentiality and a C2-domain-dependent role in controlling the pace of synaptic functional maturation.","evidence":"Cc2d1a knockout mice with cortical-neuron electrophysiology and full-length vs C2-deletion rescue","pmids":["21273312"],"confidence":"High","gaps":["Molecular link between C2 domain and synaptic maturation not defined","Cause of neonatal respiratory failure unresolved"]},{"year":2012,"claim":"Provided the structural and biochemical mechanism for CC2D1A as a negative regulator of ESCRT-III, binding the CHMP4B hairpin to block polymerization.","evidence":"SPR affinity mapping, crystal structure of CHMP4B hairpin, in vitro polymerization, HIV-1 budding mutagenesis (corroborated by Co-IP/domain mapping in cells)","pmids":["22406677","22258254"],"confidence":"High","gaps":["How CC2D1A release permits CHMP4B polymerization in vivo not defined","Regulation of CC2D1A-CHMP4B binding unknown"]},{"year":2012,"claim":"Extended the innate-immune adaptor role to cytosolic RNA sensing, placing CC2D1A upstream of IPS-1 in the RIG-I/MDA5 pathway.","evidence":"Co-IP with RIG-I/MDA5/IPS-1, siRNA/KO epistasis, viral infection assays","pmids":["22833682"],"confidence":"High","gaps":["How an endolysosomal protein engages cytosolic RLR signaling not reconciled"]},{"year":2013,"claim":"Linked CC2D1A to cAMP homeostasis via DM14-dependent control of PDE4D localization and PKA-mediated phosphorylation.","evidence":"Co-localization, phospho-PDE4D blots, rolipram rescue in CC2D1A-mutant MEFs","pmids":["23826796"],"confidence":"Medium","gaps":["Single lab","Whether CC2D1A binds PDE4D directly not established"]},{"year":2014,"claim":"Reframed CC2D1A's NF-κB role in neurons as homeostatic and established NF-κB dysregulation as the cause of dendritic deficits.","evidence":"Neuronal gain/loss-of-function, NF-κB reporter, morphology, pharmacological NF-κB inhibition rescue","pmids":["25066123"],"confidence":"High","gaps":["Mechanism by which both gain and loss elevate NF-κB not resolved"]},{"year":2016,"claim":"Showed CC2D1A cycles to endosomal membranes and is required for endosomal morphogenesis, while excluding Notch involvement.","evidence":"Conditional KO, EM endosome morphometry, VPS4-perturbation localization, Notch reporter","pmids":["26720614"],"confidence":"High","gaps":["Centrosomal function not confirmed","Trigger for cytosol-to-endosome cycling unknown"]},{"year":2016,"claim":"Connected the ESCRT-regulatory role to receptor signaling kinetics, showing CC2D1A restrains EGFR/TLR4 ILV sorting and ERK termination.","evidence":"siRNA with receptor degradation and ERK1/2 signaling readouts","pmids":["27769858"],"confidence":"Medium","gaps":["No rescue experiment","Single lab"]},{"year":2017,"claim":"Demonstrated in vivo that 5-HT1A autoreceptor upregulation mediates the affective consequences of CC2D1A loss, formally validating the transcriptional repressor model.","evidence":"5-HT-neuron conditional KO with autoradiography, neurochemistry, behavior, and double-KO epistasis","pmids":["29101244"],"confidence":"High","gaps":["Relationship to non-serotonergic CC2D1A functions not addressed"]},{"year":2017,"claim":"Established that forebrain CC2D1A loss recapitulates human neurodevelopmental disease phenotypes spanning morphology, plasticity, and behavior.","evidence":"CamKIIa-Cre conditional KO with morphology, LTP, and behavioral battery","pmids":["26826102"],"confidence":"High","gaps":["Causal molecular pathway not dissected in this study"]},{"year":2019,"claim":"Identified a SENP1/SENP3–SUMO–Rac1 axis as the downstream mechanism linking CC2D1A loss to plasticity and memory deficits.","evidence":"Conditional KO, LTP, Rac1 activity pull-down, SENP/SUMO blots, Rac1-inhibitor rescue","pmids":["30992372"],"confidence":"High","gaps":["How CC2D1A controls SENP1/SENP3 expression unknown","Relationship to NF-κB homeostasis pathway unclear"]},{"year":2019,"claim":"Implicated CC2D1A in chemotherapy resistance, indicating its survival-signaling functions are relevant in cancer.","evidence":"shRNA knockdown with clonogenic assays and xenograft survival","pmids":["31632917"],"confidence":"Medium","gaps":["Mechanistic pathway not defined","Single lab"]},{"year":2020,"claim":"Established a ciliary/left-right patterning role and confirmed a loss-of-function disease mechanism through allele-specific rescue.","evidence":"TALEN zebrafish KO with acetylated α-tubulin staining and wild-type vs patient-mutant mRNA rescue","pmids":["33196317"],"confidence":"Medium","gaps":["Single lab/ortholog model","Molecular role of CC2D1A at cilia not defined"]},{"year":2021,"claim":"Tied CC2D1A loss to CREB/BDNF signaling alongside serotonergic dysregulation in vivo.","evidence":"AAV-shRNA hippocampal knockdown with western blot, qRT-PCR, HPLC, behavior","pmids":["34948116"],"confidence":"Medium","gaps":["No rescue","Causal ordering relative to 5-HT1A and cAMP/PDE4D not resolved"]},{"year":2021,"claim":"Linked CC2D1A loss in glutamatergic neurons to autistic-like phenotypes via E/I imbalance amenable to anti-inflammatory rescue.","evidence":"Emx1-Cre conditional KO with morphology, E/I electrophysiology, behavior, minocycline rescue","pmids":["34132974"],"confidence":"High","gaps":["Molecular target of minocycline action not identified","Integration with Rac1 and NF-κB mechanisms not established"]},{"year":null,"claim":"How CC2D1A's diverse functions—nuclear repression, cytoplasmic kinase/immune scaffolding, and ESCRT-III regulation—are coordinated within a single protein, and which is primary in each disease context, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model integrating DM14 and C2 functions","Mechanism switching CC2D1A between nuclear, cytosolic, and endosomal pools unknown","Causal hierarchy among NF-κB, Rac1, cAMP, and serotonergic pathways in neurodevelopmental disease not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,5,7,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,8,13]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[5,12,13]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4,10]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,9]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[7,8,12,13]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[6,11,15,16,20]}],"complexes":["PDK1/Akt complex","CC2D1A-CHMP4B (ESCRT-III) complex"],"partners":["CHMP4B","PDK1","AKT","EGFR","TRIF","IPS-1","RIG-I","PDE4D"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6P1N0","full_name":"Coiled-coil and C2 domain-containing protein 1A","aliases":["Akt kinase-interacting protein 1","Five prime repressor element under dual repression-binding protein 1","FRE under dual repression-binding protein 1","Freud-1","Putative NF-kappa-B-activating protein 023N"],"length_aa":951,"mass_kda":104.1,"function":"Transcription factor that binds specifically to the DRE (dual repressor element) and represses HTR1A gene transcription in neuronal cells. The combination of calcium and ATP specifically inactivates the binding with FRE. May play a role in the altered regulation of HTR1A associated with anxiety and major depression. Mediates HDAC-independent repression of HTR1A promoter in neuronal cell. Performs essential function in controlling functional maturation of synapses (By similarity). Plays distinct roles depending on its localization. When cytoplasmic, acts as a scaffold protein in the PI3K/PDK1/AKT pathway. Repressor of HTR1A when nuclear. 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An intact C2/CalB calcium/phospholipid-binding domain was required for repression. Calcium-dependent signaling blocked Freud-1–FRE binding, and inhibitors of calmodulin or CaM-dependent protein kinase reversed this calcium-mediated inhibition. Overexpression repressed the 5-HT1A promoter and decreased 5-HT1A receptor protein, while antisense to Freud-1 derepressed it.\",\n      \"method\": \"DNA-binding assays, promoter-reporter assays, antisense knockdown, CalB domain mutagenesis, immunofluorescence co-localization\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (DNA binding, reporter assay, domain mutagenesis, antisense knockdown) in a single focused study with clear functional readouts\",\n      \"pmids\": [\"12917378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Freud-1/CC2D1A binds a conserved intronic element (D2-DRE) in the human dopamine D2 receptor (DRD2) gene and represses its transcription. Recombinant Freud-1 bound D2-DRE specifically; endogenous Freud-1 occupancy was confirmed by chromatin immunoprecipitation. siRNA knockdown of Freud-1 upregulated DRD2 mRNA and binding sites. A SNP (rs2734836) adjacent to D2-DRE conferred allele-specific Freud-1 binding and differential repression.\",\n      \"method\": \"Electrophoretic mobility shift assay, chromatin immunoprecipitation, siRNA knockdown, transcriptional reporter assay, receptor-binding assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP confirms in-cell occupancy, siRNA establishes functional necessity, reporter assay confirms repression; multiple orthogonal methods in single study\",\n      \"pmids\": [\"17535813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human CC2D1A/Freud-1 encodes short and long isoforms; the long isoform (Freud-1L) is predominant in human cells and is enriched in the nuclear fraction. Nuclear export of Freud-1L is CRM1/exportin-1-dependent. Freud-1L binds the 5-HT1A dual repressor element in vitro and is bound to it in chromatin as shown by ChIP with isoform-specific antibodies.\",\n      \"method\": \"Subcellular fractionation, CRM1-inhibitor treatment, in vitro DNA-binding assay, chromatin immunoprecipitation\",\n      \"journal\": \"The European Journal of Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and fractionation provide two orthogonal methods; single lab\",\n      \"pmids\": [\"17714190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Freud-1/Aki1 (CC2D1A) functions as a receptor-selective scaffold for the PDK1/Akt pathway. It associates with PDK1 and Akt, induces PDK1/Akt complex formation, and regulates Akt activation in a concentration-dependent biphasic manner. It also associates with EGF receptor upon EGF stimulation. Freud-1/Aki1 gene silencing decreased Akt kinase activity, induced apoptosis, and increased chemosensitivity. The scaffold function was selective for EGF, not IGF-1, signaling.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, kinase activity assay, apoptosis assay, clonogenic assay\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, kinase assay, and functional siRNA knockdown with multiple readouts in one study\",\n      \"pmids\": [\"18662999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CC2D1A activates NF-κB through the canonical IKK pathway. Activation requires its C2 domain. The pathway dependence was defined by genetic epistasis: CC2D1A-induced NF-κB activation required Ubc13, TRAF2, TAK1, and the IKK complex. The deubiquitinase CYLD negatively regulates CC2D1A-mediated NF-κB activation.\",\n      \"method\": \"Transcriptional reporter assay, domain deletion/mutagenesis, dominant-negative and siRNA epistasis experiments\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — C2 domain mutagenesis combined with genetic epistasis across multiple pathway components; rigorous mechanistic dissection\",\n      \"pmids\": [\"20529849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TAPE/CC2D1A is an innate immune regulator that colocalizes with endosomal marker Rab5 and lysosomal marker LAMP1, placing it in endolysosomes. It activates TBK1, NF-κB, and ERK pathways leading to IFN-β and inflammatory cytokine induction. Knockdown selectively impairs TLR3 and endocytic TLR4 pathways to IFN-β. TAPE physically interacts and synergizes with TRIF; TAPE acts upstream of TRIF in TLR3 signaling.\",\n      \"method\": \"Immunofluorescence co-localization, co-immunoprecipitation, siRNA knockdown, reporter assay, cytokine ELISA\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — subcellular localization by imaging, physical interaction by Co-IP, and functional epistasis by siRNA with multiple pathway readouts\",\n      \"pmids\": [\"21189260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cc2d1a knockout mice die soon after birth apparently due to respiratory failure not explained by peripheral structural defects. Cc2d1a-deficient cortical neurons show a robust increase in the pace of maturation of evoked synaptic responses and synaptic vesicle trafficking. Reintroduction of full-length Cc2d1a, but not a C2-domain-deletion mutant, rescued these synaptic anomalies, demonstrating that the C2 domain is required for Cc2d1a's role in controlling synaptic functional maturation.\",\n      \"method\": \"Knockout mouse generation, electrophysiology of cortical neurons, rescue by lentiviral expression of full-length vs. C2-deletion mutant\",\n      \"journal\": \"Journal of Neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — KO with defined electrophysiological phenotype and domain-specific rescue experiment\",\n      \"pmids\": [\"21273312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CC2D1A directly binds CHMP4B (ESCRT-III) with nanomolar affinity forming a 1:1 complex. The binding site on CC2D1A maps to a short linear sequence within the third DM14 domain; the binding site on CHMP4B maps to its N-terminal helical hairpin as defined by crystal structure and surface plasmon resonance mutagenesis. CC2D1A binding prevents CHMP4B polymerization in vitro, suggesting CC2D1A acts as a negative regulator of CHMP4B function. Mutations disrupting the CC2D1A-binding surface on CHMP4B abolished the dominant-negative effect of CHMP4B C-terminal truncation on HIV-1 budding.\",\n      \"method\": \"Pulldown, surface plasmon resonance (affinity measurement), crystal structure of CHMP4B helical hairpin, in vitro polymerization assay, HIV-1 budding assay with mutagenesis\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, SPR-based affinity mapping, in vitro polymerization assay, and mutagenesis with functional HIV budding readout all in one study\",\n      \"pmids\": [\"22406677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CC2D1A and CC2D1B bind to the core domain of CHMP4B proteins in human cells and are found in high-molecular-weight complexes with CHMP4 in vivo. The DM14 domains constitute novel CHMP4-binding modules; the highest-affinity DM14 domain alone inhibits ALIX-dependent HIV-1 budding by sequestering CHMP4. Overexpression of CC2D1A inhibited HIV-1 release; siRNA against CC2D1A or CC2D1B increased budding under certain conditions, consistent with a role in restraining CHMP4 polymerization.\",\n      \"method\": \"Co-immunoprecipitation from human cells, domain mapping, HIV-1 budding assay, siRNA knockdown\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain mapping, gain- and loss-of-function with HIV budding readout; replicates findings of PMID 22406677 with independent methods\",\n      \"pmids\": [\"22258254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TAPE/CC2D1A physically interacts with RIG-I, MDA5, and IPS-1 (MAVS) and activates the IFN-β promoter. TAPE knockdown impairs IFN-β activation induced by RLRs but not by IPS-1 overexpression, placing TAPE upstream of IPS-1 in the RIG-I-like receptor pathway. TAPE-deficient cells show defective cytokine production and antiviral responses upon RNA virus infection.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown and knockout, reporter assay, cytokine measurement, viral infection assay\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP establishes physical interactions, genetic epistasis with siRNA/KO places TAPE upstream of IPS-1, functional antiviral readout confirmed\",\n      \"pmids\": [\"22833682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CC2D1A co-localizes with PDE4D in the cytosol before cAMP stimulation and at the cell periphery after stimulation; full-length CC2D1A is required for this translocation. In CC2D1A mutant cells lacking three of four DM14 domains, the complex fails to translocate and PDE4D Ser126 is constitutively phosphorylated by PKA, leading to PDE4D hyperactivity and defective downstream CREB phosphorylation. Rolipram (PDE4 inhibitor) restored CREB phosphorylation in mutant cells.\",\n      \"method\": \"Immunofluorescence co-localization, phospho-specific western blot, pharmacological rescue with rolipram, mouse embryonic fibroblasts from CC2D1A mutant mice\",\n      \"journal\": \"Cell Communication and Signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — localization tied to functional consequence, domain-deletion evidence, pharmacological rescue; single lab\",\n      \"pmids\": [\"23826796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cc2d1a gain- and loss-of-function both increase NF-κB activation in neurons, revealing a homeostatic role. Cc2d1a knockdown in neurons reduces dendritic complexity and increases NF-κB activity. Inhibiting NF-κB activity rescued the dendritic complexity defect caused by Cc2d1a depletion, establishing NF-κB dysregulation as the pathway mechanism downstream of CC2D1A loss in neurons.\",\n      \"method\": \"siRNA knockdown in neurons, NF-κB reporter assay, neuronal morphology analysis, pharmacological NF-κB inhibition rescue\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function combined with pharmacological epistasis rescue; multiple orthogonal readouts\",\n      \"pmids\": [\"25066123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CC2D1A (mammalian ortholog of Drosophila Lgd) and its interaction partner CHMP4B localize to endosomes in MEF cells when VPS4 activity is reduced, indicating CC2D1A cycles between cytosol and endosomal membrane. Cc2d1a knockout MEF cells show increased average endosome size, indicating a defect in endosomal morphogenesis. However, CC2D1A loss does not affect Notch signaling in intestinal-specific knockout mice, and centrosomal function was not confirmed.\",\n      \"method\": \"Conditional knockout mice, electron microscopy of endosomes, immunofluorescence co-localization with VPS4 dominant-negative, Notch reporter (Hes1-emGFP) analysis\",\n      \"journal\": \"PLoS Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — EM morphometry of endosomes in KO cells, live localization with VPS4 perturbation; also reports negative result for Notch signaling\",\n      \"pmids\": [\"26720614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CC2D1A binds to CHMP4B polymers formed on endosomes and regulates the endosomal sorting pathway. Depletion of CC2D1A and CC2D1B accelerates lysosomal degradation of EGFR and TLR4 by promoting their sorting to intraluminal vesicles (ILVs), and rapidly terminates ERK1/2 downstream signaling.\",\n      \"method\": \"siRNA knockdown, receptor degradation assay, western blot for downstream signaling (ERK1/2), immunofluorescence\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with receptor degradation and signaling readouts; single lab, no rescue experiment\",\n      \"pmids\": [\"27769858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conditional knockout of Freud-1/Cc2d1a specifically in 5-HT neurons in adult mice (cF1ko) increases 5-HT1A autoreceptor protein, binding, and hypothermic response, reduces 5-HT content and raphe neuronal activity, and produces anxiety- and depression-like behavior resistant to fluoxetine. Conditional double knockout removing both Freud-1 and 5-HT1A in 5-HT neurons abolished the anxiety/depression-like phenotype of Freud-1 knockout, demonstrating that the behavioral effects of Freud-1 loss are mediated through 5-HT1A autoreceptor upregulation.\",\n      \"method\": \"Conditional knockout mouse (Cre/loxP in 5-HT neurons), receptor autoradiography, 5-HT neurochemistry, behavioral testing, conditional double knockout epistasis\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with double-KO epistasis definitively places Freud-1 upstream of 5-HT1A autoreceptor regulation; multiple biochemical and behavioral readouts\",\n      \"pmids\": [\"29101244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Forebrain-specific postnatal conditional deletion of Cc2d1a (CamKIIa-Cre) in mice produces abnormal cortical dendrite organization, reduced dendritic spine density, deficits in LTP/neuronal plasticity, and impaired spatial learning and memory, as well as reduced sociability, hyperactivity, anxiety, and excessive grooming, recapitulating human CC2D1A loss-of-function phenotypes.\",\n      \"method\": \"Conditional knockout mouse, neuronal morphology analysis (Golgi/immunofluorescence), electrophysiology (LTP), behavioral battery\",\n      \"journal\": \"Cerebral Cortex\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined morphological and electrophysiological phenotypes plus behavioral characterization; multiple orthogonal readouts\",\n      \"pmids\": [\"26826102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Conditional deletion of Cc2d1a from excitatory neurons impairs LTP at CA1 synapses and object location memory. Loss of CC2D1A results in reduced SENP1 and SENP3 expression, increasing Rac1 SUMOylation and thereby elevating basal Rac1 activity. Partial pharmacological blockade of Rac1 rescued both LTP and memory deficits in Cc2d1a cKO mice, establishing Rac1 hyperactivation as a downstream mechanism.\",\n      \"method\": \"Conditional knockout mouse (CamKIIa-Cre), LTP electrophysiology, Rac1 activity pull-down assay, western blot for SENP1/SENP3/SUMOylated Rac1, pharmacological rescue with Rac1 inhibitor\",\n      \"journal\": \"The Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical pathway dissection (SENP1/3, SUMOylated Rac1) combined with pharmacological epistasis rescue of electrophysiological and behavioral phenotypes\",\n      \"pmids\": [\"30992372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CC2D1A promotes chemotherapy resistance in ovarian cancer cells. shRNA-mediated knockdown of CC2D1A in cisplatin-resistant ovarian cancer cell lines increased sensitivity to cisplatin and paclitaxel in clonogenic assays, and xenograft mice with CC2D1A knockdown survived significantly longer under chemotherapy treatment.\",\n      \"method\": \"shRNA knockdown, cell viability/clonogenic assay, xenograft mouse model\",\n      \"journal\": \"Frontiers in Oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular and in vivo phenotype; pathway mechanism not fully defined; single lab\",\n      \"pmids\": [\"31632917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Monoallelic loss-of-function mutations in CC2D1A are associated with heterotaxy and ciliary dysfunction. In zebrafish, TALEN-mediated somatic and germline cc2d1a knockout produced heterotaxy of cardiovascular and gastrointestinal organs and defective cilia (reduced acetylated α-tubulin staining). Phenotypes were rescued by wild-type cc2d1a mRNA but not by mRNA encoding the patient mutations, confirming a loss-of-function mechanism for CC2D1A in left-right patterning and ciliogenesis.\",\n      \"method\": \"TALEN zebrafish knockout, whole-mount immunostaining of acetylated α-tubulin, mRNA rescue experiment\",\n      \"journal\": \"Circulation: Genomic and Precision Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — zebrafish KO with morphological phenotype and allele-specific mRNA rescue; single lab, ortholog model\",\n      \"pmids\": [\"33196317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cc2d1a/Freud-1 hippocampal knockdown via AAV-shRNA upregulates 5-HT and 5-HIAA levels, reduces CREB mRNA and CREB phosphorylation, upregulates cFos mRNA, and enhances proBDNF protein expression, placing CC2D1A in a pathway that regulates CREB and BDNF signaling in addition to 5-HT1A receptor control.\",\n      \"method\": \"AAV-mediated shRNA knockdown in vivo, western blot, qRT-PCR, HPLC for serotonin metabolites, behavioral tests\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown with multiple biochemical readouts; single lab, no rescue\",\n      \"pmids\": [\"34948116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of CC2D1A in glutamatergic neurons (Emx1-Cre) in mice leads to autistic-like phenotypes including self-injurious repetitive grooming and aberrant social interactions, decreased complexity of mPFC pyramidal neuron dendritic arbors, and increased synaptic excitation/inhibition (E/I) ratio. Chronic minocycline treatment rescued behavioral, morphological, and E/I ratio abnormalities, identifying inflammatory/E/I imbalance as a mechanistic pathway.\",\n      \"method\": \"Emx1-Cre conditional knockout, dendritic morphology analysis, electrophysiology (E/I ratio in mPFC), behavioral battery, pharmacological rescue with minocycline\",\n      \"journal\": \"Neurotherapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with morphological, electrophysiological, and behavioral phenotypes rescued by pharmacological intervention; multiple orthogonal readouts\",\n      \"pmids\": [\"34132974\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CC2D1A (Freud-1/TAPE/Aki1) is a multi-functional scaffold/regulatory protein that: (1) acts as a calcium-regulated transcriptional repressor of the 5-HT1A receptor and dopamine D2 receptor genes by binding specific promoter elements via its DM14 and C2 domains; (2) scaffolds the PDK1/Akt complex downstream of EGF receptor; (3) activates NF-κB through the canonical IKK pathway (requiring its C2 domain and TRAF2/TAK1/Ubc13) while also maintaining homeostatic NF-κB levels in neurons; (4) resides in endolysosomes and links TLR3/TLR4 and RIG-I-like receptors to IFN-β induction upstream of TRIF/IPS-1; (5) regulates ESCRT-III function by directly binding the N-terminal hairpin of CHMP4B with nanomolar affinity through its DM14 domains, preventing CHMP4B polymerization and controlling ILV sorting and receptor degradation; (6) co-localizes with PDE4D and regulates cAMP homeostasis and downstream CREB phosphorylation; and (7) in neurons, loss of CC2D1A causes Rac1 hyperactivation (via reduced SENP1/SENP3-mediated de-SUMOylation of Rac1), leading to deficits in dendritic complexity, synaptic plasticity, and cognitive/social behavior.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CC2D1A (Freud-1/TAPE/Aki1) is a multifunctional DM14- and C2-domain scaffold that operates as both a calcium-regulated transcriptional repressor and a cytoplasmic signaling regulator across neuronal, immune, and membrane-trafficking contexts [#0, #4, #7]. As a transcriptional repressor it binds a 14-bp repressor element in the 5-HT1A receptor promoter and an intronic element in the dopamine D2 receptor gene, mediating calcium-sensitive repression through its C2/CalB domain; calcium signaling and CaM/CaMK activity relieve this repression [#0, #1]. The predominant long isoform is nuclear and shuttles via CRM1-dependent export [#2]. In the cytoplasm CC2D1A scaffolds the PDK1/Akt complex downstream of activated EGFR [#3], activates canonical NF-\\u03baB through a TRAF2/Ubc13/TAK1/IKK cascade requiring its C2 domain [#4], and—localizing to endolysosomes—links TLR3, endocytic TLR4, and RIG-I-like receptors (RIG-I, MDA5) to IFN-\\u03b2 induction upstream of TRIF and IPS-1/MAVS [#5, #9]. Through its DM14 domains CC2D1A directly binds the N-terminal hairpin of the ESCRT-III subunit CHMP4B with nanomolar affinity, preventing CHMP4B polymerization and thereby restraining intraluminal-vesicle sorting and lysosomal degradation of receptors such as EGFR and TLR4 [#7, #8, #13]. In neurons CC2D1A controls dendritic complexity, synaptic maturation, and plasticity: it maintains homeostatic NF-\\u03baB levels, and its loss drives Rac1 hyperactivation through reduced SENP1/SENP3-mediated de-SUMOylation, with pharmacological inhibition of NF-\\u03baB or Rac1 rescuing the resulting deficits [#6, #11, #16]. Conditional knockout mice recapitulate human CC2D1A loss-of-function neurodevelopmental phenotypes including impaired learning, reduced sociability, repetitive grooming, and altered excitation/inhibition balance [#15, #20]. CC2D1A loss also causes heterotaxy and ciliary defects in zebrafish via a loss-of-function mechanism [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established CC2D1A's founding identity as a sequence-specific, calcium-regulated transcriptional repressor, explaining how 5-HT1A receptor levels are set.\",\n      \"evidence\": \"DNA-binding, promoter-reporter, antisense knockdown, and CalB-domain mutagenesis on the 5-HT1A promoter\",\n      \"pmids\": [\"12917378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling calcium/CaMK signaling to loss of FRE binding not structurally defined\", \"Did not address non-transcriptional functions\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended the repressor role to a second neurotransmitter receptor gene (DRD2) and showed allele-specific regulation, establishing CC2D1A as a broader regulator of monoaminergic receptor expression.\",\n      \"evidence\": \"EMSA, ChIP, siRNA, and reporter assays on the DRD2 intronic D2-DRE plus SNP analysis\",\n      \"pmids\": [\"17535813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Shared sequence determinants of FRE vs D2-DRE recognition not defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved isoform usage and showed the nuclear long isoform is the chromatin-engaged repressor with CRM1-dependent export, clarifying where repression occurs.\",\n      \"evidence\": \"Subcellular fractionation, CRM1 inhibition, in vitro DNA binding, isoform-specific ChIP\",\n      \"pmids\": [\"17714190\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Functional role of nuclear export in regulating repression not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a cytoplasmic scaffolding function distinct from transcription, coupling CC2D1A to EGFR-driven PDK1/Akt survival signaling.\",\n      \"evidence\": \"Reciprocal Co-IP, kinase assays, siRNA with apoptosis and clonogenic readouts\",\n      \"pmids\": [\"18662999\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain required for PDK1/Akt scaffolding not mapped\", \"Basis of EGF- vs IGF-1 selectivity unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined CC2D1A as a C2-domain-dependent activator of canonical NF-\\u03baB and placed it within a defined ubiquitin-kinase cascade.\",\n      \"evidence\": \"Reporter assays with domain mutagenesis and genetic epistasis across Ubc13/TRAF2/TAK1/IKK plus CYLD\",\n      \"pmids\": [\"20529849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target of CC2D1A within the cascade not identified\", \"How C2 domain engages the pathway unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified CC2D1A/TAPE as an endolysosomal innate immune adaptor linking endosomal TLRs to IFN-\\u03b2 upstream of TRIF.\",\n      \"evidence\": \"Rab5/LAMP1 co-localization, TRIF Co-IP, siRNA epistasis with cytokine readouts\",\n      \"pmids\": [\"21189260\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding interface with TRIF not mapped\", \"Relationship to NF-\\u03baB scaffolding role not integrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated organismal essentiality and a C2-domain-dependent role in controlling the pace of synaptic functional maturation.\",\n      \"evidence\": \"Cc2d1a knockout mice with cortical-neuron electrophysiology and full-length vs C2-deletion rescue\",\n      \"pmids\": [\"21273312\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between C2 domain and synaptic maturation not defined\", \"Cause of neonatal respiratory failure unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the structural and biochemical mechanism for CC2D1A as a negative regulator of ESCRT-III, binding the CHMP4B hairpin to block polymerization.\",\n      \"evidence\": \"SPR affinity mapping, crystal structure of CHMP4B hairpin, in vitro polymerization, HIV-1 budding mutagenesis (corroborated by Co-IP/domain mapping in cells)\",\n      \"pmids\": [\"22406677\", \"22258254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CC2D1A release permits CHMP4B polymerization in vivo not defined\", \"Regulation of CC2D1A-CHMP4B binding unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended the innate-immune adaptor role to cytosolic RNA sensing, placing CC2D1A upstream of IPS-1 in the RIG-I/MDA5 pathway.\",\n      \"evidence\": \"Co-IP with RIG-I/MDA5/IPS-1, siRNA/KO epistasis, viral infection assays\",\n      \"pmids\": [\"22833682\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an endolysosomal protein engages cytosolic RLR signaling not reconciled\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked CC2D1A to cAMP homeostasis via DM14-dependent control of PDE4D localization and PKA-mediated phosphorylation.\",\n      \"evidence\": \"Co-localization, phospho-PDE4D blots, rolipram rescue in CC2D1A-mutant MEFs\",\n      \"pmids\": [\"23826796\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether CC2D1A binds PDE4D directly not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Reframed CC2D1A's NF-\\u03baB role in neurons as homeostatic and established NF-\\u03baB dysregulation as the cause of dendritic deficits.\",\n      \"evidence\": \"Neuronal gain/loss-of-function, NF-\\u03baB reporter, morphology, pharmacological NF-\\u03baB inhibition rescue\",\n      \"pmids\": [\"25066123\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which both gain and loss elevate NF-\\u03baB not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed CC2D1A cycles to endosomal membranes and is required for endosomal morphogenesis, while excluding Notch involvement.\",\n      \"evidence\": \"Conditional KO, EM endosome morphometry, VPS4-perturbation localization, Notch reporter\",\n      \"pmids\": [\"26720614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Centrosomal function not confirmed\", \"Trigger for cytosol-to-endosome cycling unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected the ESCRT-regulatory role to receptor signaling kinetics, showing CC2D1A restrains EGFR/TLR4 ILV sorting and ERK termination.\",\n      \"evidence\": \"siRNA with receptor degradation and ERK1/2 signaling readouts\",\n      \"pmids\": [\"27769858\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue experiment\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated in vivo that 5-HT1A autoreceptor upregulation mediates the affective consequences of CC2D1A loss, formally validating the transcriptional repressor model.\",\n      \"evidence\": \"5-HT-neuron conditional KO with autoradiography, neurochemistry, behavior, and double-KO epistasis\",\n      \"pmids\": [\"29101244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship to non-serotonergic CC2D1A functions not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established that forebrain CC2D1A loss recapitulates human neurodevelopmental disease phenotypes spanning morphology, plasticity, and behavior.\",\n      \"evidence\": \"CamKIIa-Cre conditional KO with morphology, LTP, and behavioral battery\",\n      \"pmids\": [\"26826102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal molecular pathway not dissected in this study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified a SENP1/SENP3\\u2013SUMO\\u2013Rac1 axis as the downstream mechanism linking CC2D1A loss to plasticity and memory deficits.\",\n      \"evidence\": \"Conditional KO, LTP, Rac1 activity pull-down, SENP/SUMO blots, Rac1-inhibitor rescue\",\n      \"pmids\": [\"30992372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CC2D1A controls SENP1/SENP3 expression unknown\", \"Relationship to NF-\\u03baB homeostasis pathway unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated CC2D1A in chemotherapy resistance, indicating its survival-signaling functions are relevant in cancer.\",\n      \"evidence\": \"shRNA knockdown with clonogenic assays and xenograft survival\",\n      \"pmids\": [\"31632917\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic pathway not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established a ciliary/left-right patterning role and confirmed a loss-of-function disease mechanism through allele-specific rescue.\",\n      \"evidence\": \"TALEN zebrafish KO with acetylated \\u03b1-tubulin staining and wild-type vs patient-mutant mRNA rescue\",\n      \"pmids\": [\"33196317\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab/ortholog model\", \"Molecular role of CC2D1A at cilia not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Tied CC2D1A loss to CREB/BDNF signaling alongside serotonergic dysregulation in vivo.\",\n      \"evidence\": \"AAV-shRNA hippocampal knockdown with western blot, qRT-PCR, HPLC, behavior\",\n      \"pmids\": [\"34948116\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No rescue\", \"Causal ordering relative to 5-HT1A and cAMP/PDE4D not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked CC2D1A loss in glutamatergic neurons to autistic-like phenotypes via E/I imbalance amenable to anti-inflammatory rescue.\",\n      \"evidence\": \"Emx1-Cre conditional KO with morphology, E/I electrophysiology, behavior, minocycline rescue\",\n      \"pmids\": [\"34132974\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of minocycline action not identified\", \"Integration with Rac1 and NF-\\u03baB mechanisms not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CC2D1A's diverse functions—nuclear repression, cytoplasmic kinase/immune scaffolding, and ESCRT-III regulation—are coordinated within a single protein, and which is primary in each disease context, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model integrating DM14 and C2 functions\", \"Mechanism switching CC2D1A between nuclear, cytosolic, and endosomal pools unknown\", \"Causal hierarchy among NF-\\u03baB, Rac1, cAMP, and serotonergic pathways in neurodevelopmental disease not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 5, 7, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 8, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [5, 12, 13]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [7, 8, 12, 13]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [6, 11, 15, 16, 20]}\n    ],\n    \"complexes\": [\n      \"PDK1/Akt complex\",\n      \"CC2D1A-CHMP4B (ESCRT-III) complex\"\n    ],\n    \"partners\": [\n      \"CHMP4B\",\n      \"PDK1\",\n      \"AKT\",\n      \"EGFR\",\n      \"TRIF\",\n      \"IPS-1\",\n      \"RIG-I\",\n      \"PDE4D\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}