{"gene":"NACC1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1997,"finding":"NAC-1 mRNA encodes a protein containing a POZ/BTB domain in its first 120 amino acids; this domain mediates protein-protein interactions among transcriptional regulators. NAC-1 mRNA is selectively increased in the nucleus accumbens after chronic cocaine self-administration.","method":"cDNA cloning, sequence analysis, in situ hybridization","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — structural inference from sequence plus expression data; single lab, foundational identification paper","pmids":["9278521"],"is_preprint":false},{"year":2000,"finding":"NAC-1 acts as a transcriptional repressor localized to neuronal nuclei. Transfection of NAC-1 in cell culture repressed transcription of a reporter gene. NAC-1 interacted with other POZ/BTB proteins in mammalian two-hybrid assays via its POZ/BTB domain. Adenoviral overexpression of NAC-1 in the rat nucleus accumbens prevented the development (but not the expression) of cocaine-induced behavioral sensitization.","method":"Reporter gene assay (transcriptional repression), mammalian two-hybrid, nuclear localization by immunofluorescence, adenoviral overexpression in vivo","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, two-hybrid, in vivo adenoviral OE), single lab","pmids":["10934270"],"is_preprint":false},{"year":1999,"finding":"Antisense knockdown of NAC-1 in the nucleus accumbens enhanced the motor stimulant response to acute cocaine without increasing dopamine release, but increased behavioral response to intra-accumbens dopamine injection; suggesting NAC-1 induction by cocaine is a compensatory mechanism regulating postsynaptic dopamine transmission.","method":"Antisense oligonucleotide microinjection into nucleus accumbens, in vivo microdialysis, behavioral assay","journal":"Synapse","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean in vivo loss-of-function with defined behavioral and neurochemical readouts; single lab, single study","pmids":["10400893"],"is_preprint":false},{"year":2006,"finding":"NAC-1 homooligomerizes through its BTB/POZ domain, forming discrete nuclear bodies. Expression of a dominant-negative BTB/POZ-domain-only mutant disrupts these NAC-1 nuclear bodies, prevents tumor formation, and promotes tumor cell apoptosis. Full-length NAC-1 overexpression enhances tumorigenicity, demonstrating that BTB/POZ-mediated homodimerization is essential for oncogenic function.","method":"Co-immunoprecipitation, double immunofluorescence, dominant-negative mutant expression, mouse xenograft model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus dominant-negative functional rescue in vivo, replicated across multiple cell lines and in vivo models","pmids":["17130457"],"is_preprint":false},{"year":2007,"finding":"NAC-1 acts as a transcriptional repressor of Gadd45GIP1 (growth arrest and DNA-damage-inducible 45-gamma interacting protein). NAC-1 knockdown in SKOV3 and HeLa cells induced Gadd45GIP1 expression transcriptionally; engineered NAC-1 expression in NAC-1-negative cells suppressed endogenous Gadd45GIP1. Induction of dominant-negative NAC-1 conferred a growth-inhibitory effect partially reversible by Gadd45GIP1 knockdown. Gadd45GIP1 overexpression caused growth arrest in vitro and in vivo.","method":"SAGE, siRNA knockdown, engineered overexpression, dominant-negative induction, in vitro and in vivo growth assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (SAGE discovery, siRNA KD, OE, dominant-negative epistasis) in multiple cell lines and in vivo","pmids":["17804717"],"is_preprint":false},{"year":2009,"finding":"NAC-1 homodimerization (via BTB/POZ domain) contributes to paclitaxel resistance through negative regulation of the Gadd45 pathway. NAC-1 knockdown or disruption of homodimerization by dominant-negative BTB/POZ induced Gadd45gamma expression, which interacted with Gadd45gip1. Ectopic NAC-1 or Gadd45gip1 knockdown conferred paclitaxel resistance; NAC-1 knockdown or Gadd45gip1 overexpression increased paclitaxel sensitivity.","method":"siRNA knockdown, ectopic expression, dominant-negative BTB/POZ construct, shRNA, ex vivo drug resistance assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic manipulations with defined mechanistic pathway (NAC-1 → Gadd45GIP1/Gadd45 axis), replicated across cell lines and patient tissues","pmids":["19305429"],"is_preprint":false},{"year":2017,"finding":"A recurrent de novo heterozygous NACC1 variant c.892C>T (p.Arg298Trp) causes a neurodevelopmental syndrome (microcephaly, epilepsy, cataracts, profound developmental delay). The same variant was identified in 7 independent patients by whole-exome sequencing, establishing NACC1 as a germline disease gene with selective constraint against missense variants.","method":"Whole-exome sequencing in 17,228 individuals, statistical analysis of variant recurrence","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Strong — genetic discovery in large cohort with genome-wide significance, but no in vitro/in vivo functional mechanism established in this paper","pmids":["28132692"],"is_preprint":false},{"year":2023,"finding":"The disease-associated Nacc1-R284W (murine homolog of human R298W) mutation impairs glutamatergic neurotransmission in a cell-autonomous dominant-negative manner in autaptic neurons. Novel Nacc1 interaction partners identified in the brain include SynGAP1, GluK2A, and several SUMO E3 ligases. The R284W mutant shows reduced binding to SynGAP1 and GluK2A, and greatly increased SUMOylation. Ablating SUMOylation of R284W partially restored SynGAP1 binding but not GluK2A binding.","method":"Autaptic neuron electrophysiology, co-immunoprecipitation/pulldown (interaction partners), SUMOylation biochemical assays, mutagenesis","journal":"Frontiers in molecular neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — electrophysiological functional assay plus biochemical interaction mapping with mutagenesis, multiple orthogonal methods in single lab","pmids":["37533751"],"is_preprint":false},{"year":2024,"finding":"The Nacc1 R284W knock-in mouse model of the human R298W mutation exhibits epileptiform discharges, behavioral seizures, hindlimb clasping, and altered EEG power spectral distribution. RNA-seq of P14 mutant cortex revealed >1,000 differentially expressed genes: synaptic genes (postsynapse, ion channels) were upregulated and glial/metabolic/mitochondrial genes were downregulated. Synaptic protein levels were altered. NACC1 nuclear immunoreactivity increased in cortical pyramidal neurons and parvalbumin interneurons but not in astrocytes or oligodendroglia. Homozygosity worsened phenotypes.","method":"Knock-in mouse model, EEG, RNA-seq, immunohistochemistry, western blot, behavioral assays","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo methods (EEG, RNA-seq, IHC, behavioral) in a genetically defined mouse model with dose-response (het vs. hom)","pmids":["38388424"],"is_preprint":false},{"year":2019,"finding":"CRM197 (HB-EGF inhibitor) reverses paclitaxel resistance in ovarian cancer cells at least in part by downregulating NAC-1 and its downstream Gadd45gip1/Gadd45 pathway, activating the proapoptotic JNK/p38MAPK pathway and enhancing caspase-3 activity. This places NACC-1 downstream of HB-EGF signaling in the paclitaxel resistance pathway.","method":"In vitro drug treatment, western blot, apoptosis assay, in vivo xenograft","journal":"Cancer medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single lab, pharmacological intervention with pathway readouts but no direct genetic epistasis for NACC1 position","pmids":["31490008"],"is_preprint":false},{"year":2025,"finding":"NACC1 acts as a key transcriptional regulator of RIPK3 in macrophages through an NF-κB-linked pathway. In PNPLA3-148M macrophages under lipotoxic stress, NF-κB upregulates NACC1, which in turn drives RIPK3 expression and phosphorylation, promoting necroptosis and pro-inflammatory cytokine secretion. Genetic or pharmacological inhibition of NACC1 reduced RIPK3, suppressed necroptosis, and lowered inflammatory cytokines.","method":"iPSC-derived multicellular liver culture, single-cell RNA-seq, genetic knockdown, pharmacological inhibition (NIC3), integrative transcriptomic analysis","journal":"Hepatology communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — genetic KD plus pharmacological inhibition with defined pathway readouts (RIPK3, cytokines), but single lab and relatively novel finding","pmids":["41564367"],"is_preprint":false},{"year":2025,"finding":"NACC1 directly binds gene-regulatory regions and promotes chromatin accessibility to induce expression of totipotency genes, zygotic genome activation genes, and totipotency-associated retrotransposons in mouse embryonic stem cells. These NACC1-regulated retrotransposons further modulate expression of proximal totipotency genes, forming a coherent feed-forward regulatory mechanism. NACC1 is also required for embryogenesis progression beyond the totipotency stage.","method":"Single-cell proteomics, single-cell transcriptomics, chromatin accessibility assays (ATAC-seq or equivalent), genomics (ChIP-seq or CUT&RUN), loss-of-function in embryos","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genomics methods (binding, chromatin accessibility, transcriptomics) with functional in vivo embryo data; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.10.14.682353"],"is_preprint":true},{"year":2025,"finding":"NACC1 regulates ADAM9 expression, and the NACC1/ADAM9/PI3K/AKT axis sustains AML cell survival. NACC1 knockdown inhibited PI3K/AKT signaling, promoted apoptosis, suppressed proliferation, and caused G0/G1 arrest. ADAM9 was downregulated upon NACC1 knockdown, and AKT activator SC79 restored proliferation inhibited by either NACC1 or ADAM9 knockdown.","method":"Lentiviral knockdown, flow cytometry, proliferation assays, western blot, AKT activator rescue","journal":"International journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic KD with epistatic rescue (SC79), multiple readouts; single lab","pmids":["39898241"],"is_preprint":false},{"year":2025,"finding":"circNRIP1 interacts with the KH1/2 domain of IGF2BP1 (an m6A reader), blocking its activity and thereby reducing NACC1 mRNA stability, leading to suppression of colorectal tumorigenesis. This places NACC1 mRNA as a downstream target whose stability is regulated by IGF2BP1-mediated m6A reading.","method":"RNA pull-down, proteomic analysis, RNA immunoprecipitation-PCR, in vitro and in vivo proliferation/tumorigenesis assays","journal":"Gastroenterology report","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNA pull-down with proteomics and RIP-PCR define mechanism; functional in vivo data; single lab","pmids":["40584151"],"is_preprint":false},{"year":2025,"finding":"ESC-derived cortical neurons homozygous or heterozygous for the NACC1 R298W mutation express higher NACC1 protein levels and show altered expression of transcripts involved in pre- and postsynaptic signaling, neurotransmission, extracellular matrix, and adhesion. Increased protein levels of presynaptic SNAP25 and VAMP2 and postsynaptic SYNGAP1 were observed. Mutant neural stem cells showed increased adhesion to collagen 1 and 4. Transcriptional profiling indicated a shift in dorsal-ventral patterning toward a ventral signature.","method":"Genome-edited human isogenic ESCs, cortical neuron differentiation, RNA-seq, western blot, adhesion functional assay, qPCR","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isogenic human cell model with multiple orthogonal readouts (RNA-seq, western blot, functional adhesion assay); single lab","pmids":["40910719"],"is_preprint":false}],"current_model":"NACC1 (NAC-1) is a BTB/POZ- and BEN-domain-containing transcriptional repressor that homodimerizes via its BTB/POZ domain to form discrete nuclear bodies; it suppresses target genes including Gadd45GIP1 to promote cell growth and survival, mediates paclitaxel resistance through the Gadd45 pathway downstream of HB-EGF/NAC-1 signaling, regulates glutamatergic neurotransmission and interacts with SynGAP1 and GluK2A (interactions impaired by the disease-associated R298W mutation which also causes hyperSUMOylation), drives totipotency-gene expression by binding regulatory chromatin and establishing a retrotransposon-mediated feed-forward loop, and controls macrophage necroptosis through an NF-κB–NACC1–RIPK3 axis; a recurrent de novo R298W missense mutation causes a severe neurodevelopmental syndrome by dominantly impairing these neuronal functions."},"narrative":{"mechanistic_narrative":"NACC1 (NAC-1) is a BTB/POZ-domain transcriptional repressor that homooligomerizes through its BTB/POZ domain to form discrete nuclear bodies, an interaction that is essential for its function: a BTB/POZ-only dominant-negative construct disrupts these bodies, blocks tumor formation, and triggers apoptosis [PMID:9278521, PMID:17130457]. A principal repression target is Gadd45GIP1; NACC1 silences Gadd45GIP1 transcriptionally to sustain cell growth, and disruption of NACC1 homodimerization de-represses the Gadd45 pathway, defining a NACC1→Gadd45GIP1/Gadd45 axis that controls proliferation and paclitaxel sensitivity downstream of HB-EGF signaling [PMID:17804717, PMID:19305429, PMID:31490008]. This pro-survival regulatory activity recurs across malignancies, where NACC1 sustains an ADAM9/PI3K/AKT survival axis in AML and drives an NF-κB–NACC1–RIPK3 axis governing macrophage necroptosis and inflammatory cytokine output under lipotoxic stress [PMID:41564367, PMID:39898241]. In early development NACC1 binds gene-regulatory chromatin and promotes accessibility to induce totipotency genes and totipotency-associated retrotransposons in a feed-forward loop required for embryogenesis [PMID:bio_10.1101_2025.10.14.682353]. In the nervous system NACC1 was first identified as a cocaine-inducible repressor in the nucleus accumbens that regulates postsynaptic dopamine transmission [PMID:10934270, PMID:10400893]; it also interacts with the synaptic proteins SynGAP1 and GluK2A to support glutamatergic neurotransmission [PMID:37533751]. A recurrent de novo heterozygous p.Arg298Trp variant causes a severe neurodevelopmental syndrome (microcephaly, epilepsy, cataracts, profound developmental delay) [PMID:28132692], acting in a dominant-negative manner that impairs SynGAP1/GluK2A binding, drives hyperSUMOylation, and produces seizures and transcriptional dysregulation of synaptic and glial genes in knock-in mice and human isogenic neurons [PMID:37533751, PMID:38388424, PMID:40910719].","teleology":[{"year":1997,"claim":"Established NAC-1 as a candidate transcriptional regulator by identifying its POZ/BTB protein-interaction domain and its cocaine-inducible expression in the nucleus accumbens.","evidence":"cDNA cloning, sequence analysis, and in situ hybridization after chronic cocaine self-administration","pmids":["9278521"],"confidence":"Medium","gaps":["No direct transcriptional activity demonstrated","Target genes unknown","Domain function inferred from sequence only"]},{"year":1999,"claim":"Defined NAC-1 induction as a compensatory regulator of postsynaptic dopamine transmission, linking it functionally to drug-response circuitry.","evidence":"Antisense knockdown in nucleus accumbens with microdialysis and behavioral readouts","pmids":["10400893"],"confidence":"Medium","gaps":["Molecular targets mediating the dopamine effect unidentified","Single in vivo study"]},{"year":2000,"claim":"Demonstrated that NAC-1 is a bona fide nuclear transcriptional repressor acting via POZ/BTB protein interactions and is required for development of cocaine sensitization.","evidence":"Reporter gene repression assay, mammalian two-hybrid, immunofluorescence, and in vivo adenoviral overexpression","pmids":["10934270"],"confidence":"Medium","gaps":["Repressed endogenous target genes not identified","Interaction partners not named"]},{"year":2006,"claim":"Showed that BTB/POZ-mediated homooligomerization into nuclear bodies is mechanistically essential for NAC-1's oncogenic, anti-apoptotic function.","evidence":"Co-immunoprecipitation, immunofluorescence, dominant-negative BTB/POZ expression, and mouse xenografts","pmids":["17130457"],"confidence":"High","gaps":["Did not identify downstream effector genes","Structural basis of oligomerization not resolved"]},{"year":2007,"claim":"Identified Gadd45GIP1 as a direct transcriptional target whose repression by NAC-1 drives cell growth, providing a concrete effector for its oncogenic activity.","evidence":"SAGE, siRNA knockdown, engineered overexpression, dominant-negative epistasis, and growth assays in vitro and in vivo","pmids":["17804717"],"confidence":"High","gaps":["Direct promoter binding not shown","Cofactors of repression undefined"]},{"year":2009,"claim":"Extended the NAC-1/Gadd45 axis to chemoresistance, establishing that homodimerization-dependent Gadd45 repression confers paclitaxel resistance.","evidence":"siRNA/shRNA knockdown, ectopic expression, dominant-negative BTB/POZ, and ex vivo drug resistance assays","pmids":["19305429"],"confidence":"High","gaps":["Mechanism connecting Gadd45 to mitotic drug response not fully resolved"]},{"year":2017,"claim":"Established NACC1 as a human germline disease gene by identifying a recurrent de novo p.Arg298Trp variant causing a neurodevelopmental syndrome.","evidence":"Whole-exome sequencing in a large cohort with statistical recurrence analysis","pmids":["28132692"],"confidence":"Medium","gaps":["No functional mechanism established in this study","Dominant-negative vs gain-of-function not distinguished"]},{"year":2019,"claim":"Placed NACC1 downstream of HB-EGF signaling in chemoresistance, showing HB-EGF inhibition downregulates NACC1 and reactivates proapoptotic MAPK signaling.","evidence":"Pharmacological HB-EGF inhibition (CRM197), western blot, apoptosis assays, and xenografts","pmids":["31490008"],"confidence":"Medium","gaps":["No direct genetic epistasis for NACC1 position in the pathway","Single lab pharmacological inference"]},{"year":2023,"claim":"Provided the mechanistic basis of the R298W disease variant by showing it impairs glutamatergic transmission, loses SynGAP1/GluK2A binding, and becomes hyperSUMOylated.","evidence":"Autaptic neuron electrophysiology, Co-IP/pulldown interaction mapping, SUMOylation assays, and mutagenesis (murine R284W)","pmids":["37533751"],"confidence":"High","gaps":["GluK2A binding not rescued by removing SUMOylation, leaving that defect mechanistically unexplained","How synaptic partners relate to transcriptional repressor function unclear"]},{"year":2024,"claim":"Demonstrated in vivo that the R284W knock-in mouse recapitulates the human epilepsy phenotype with dose-dependent severity and broad synaptic/glial transcriptional dysregulation.","evidence":"Knock-in mouse with EEG, RNA-seq, immunohistochemistry, western blot, and behavioral assays","pmids":["38388424"],"confidence":"High","gaps":["Direct transcriptional targets driving seizures not pinpointed","Cell-type-specific contributions to phenotype unresolved"]},{"year":2025,"claim":"Broadened NACC1's role to early development, showing it binds regulatory chromatin and promotes accessibility to induce totipotency genes and retrotransposons in a feed-forward loop.","evidence":"Single-cell proteomics/transcriptomics, chromatin accessibility and binding genomics, and loss-of-function in embryos (preprint)","pmids":["bio_10.1101_2025.10.14.682353"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Mechanism of accessibility promotion (vs canonical repressor role) unclear"]},{"year":2025,"claim":"Defined NACC1 as a pro-necroptotic transcriptional regulator of RIPK3 within an NF-κB-linked inflammatory axis under lipotoxic stress.","evidence":"iPSC-derived multicellular liver culture, single-cell RNA-seq, genetic knockdown, and pharmacological inhibition","pmids":["41564367"],"confidence":"Medium","gaps":["Direct binding of NACC1 to RIPK3 regulatory regions not shown","Single lab"]},{"year":2025,"claim":"Extended NACC1's pro-survival function to AML via an ADAM9/PI3K/AKT axis, and identified its mRNA as an IGF2BP1/m6A-regulated target in colorectal cancer.","evidence":"Lentiviral knockdown with AKT-activator rescue (AML); RNA pull-down, RIP-PCR, and tumorigenesis assays (CRC)","pmids":["39898241","40584151"],"confidence":"Medium","gaps":["Whether NACC1 directly represses ADAM9 not established","Single lab per finding"]},{"year":2025,"claim":"Showed in a human isogenic system that R298W elevates NACC1 protein and dysregulates synaptic, adhesion, and patterning programs, complementing the mouse phenotype.","evidence":"Genome-edited human ESC-derived cortical neurons with RNA-seq, western blot, adhesion assays, and qPCR","pmids":["40910719"],"confidence":"Medium","gaps":["Mechanism linking elevated protein to dominant phenotype unresolved","Relationship between adhesion/patterning changes and clinical features unclear"]},{"year":null,"claim":"How NACC1 reconciles its canonical role as a BTB/POZ transcriptional repressor with its chromatin-accessibility-promoting and neuronal synaptic-interaction functions, and how the R298W variant exerts dominance across these contexts, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of NACC1 nuclear bodies or DNA/chromatin engagement","Direct genomic binding sites in disease-relevant neurons unmapped","Unifying mechanism across repressor vs activator behaviors lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,4,5,10,11]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[11]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,3,8]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,4,11]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,5,10]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,7,8]}],"complexes":[],"partners":["SYNGAP1","GRIK2","GADD45GIP1","IGF2BP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96RE7","full_name":"Nucleus accumbens-associated protein 1","aliases":["BTB/POZ domain-containing protein 14B"],"length_aa":527,"mass_kda":57.3,"function":"Functions as a transcriptional repressor. Seems to function as a transcriptional corepressor in neuronal cells through recruitment of HDAC3 and HDAC4. Contributes to tumor progression, and tumor cell proliferation and survival. This may be mediated at least in part through repressing transcriptional activity of GADD45GIP1. Required for recruiting the proteasome from the nucleus to the cytoplasm and dendritic spines","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96RE7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NACC1","classification":"Not Classified","n_dependent_lines":60,"n_total_lines":1208,"dependency_fraction":0.04966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NACC1","total_profiled":1310},"omim":[{"mim_id":"617393","title":"NEURODEVELOPMENTAL DISORDER WITH EPILEPSY, CATARACTS, FEEDING DIFFICULTIES, AND DELAYED BRAIN MYELINATION; NECFM","url":"https://www.omim.org/entry/617393"},{"mim_id":"616770","title":"MICRO RNA 218-1; MIR218-1","url":"https://www.omim.org/entry/616770"},{"mim_id":"610672","title":"NUCLEUS ACCUMBENS-ASSOCIATED PROTEIN 1, BEN AND BTB/POZ DOMAINS-CONTAINING; NACC1","url":"https://www.omim.org/entry/610672"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NACC1"},"hgnc":{"alias_symbol":["NAC1","NAC-1","BEND8","BTBD30"],"prev_symbol":["BTBD14B"]},"alphafold":{"accession":"Q96RE7","domains":[{"cath_id":"3.30.710.10","chopping":"14-123","consensus_level":"medium","plddt":91.9626,"start":14,"end":123},{"cath_id":"1.10.10.2590","chopping":"340-421_428-475","consensus_level":"medium","plddt":85.5018,"start":340,"end":475}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RE7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RE7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96RE7-F1-predicted_aligned_error_v6.png","plddt_mean":63.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NACC1","jax_strain_url":"https://www.jax.org/strain/search?query=NACC1"},"sequence":{"accession":"Q96RE7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96RE7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96RE7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96RE7"}},"corpus_meta":[{"pmid":"17130457","id":"PMC_17130457","title":"A BTB/POZ protein, NAC-1, is related to tumor recurrence and is essential for tumor growth and survival.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/17130457","citation_count":118,"is_preprint":false},{"pmid":"19305429","id":"PMC_19305429","title":"NAC-1, a potential stem cell pluripotency factor, contributes to paclitaxel resistance in ovarian cancer through inactivating Gadd45 pathway.","date":"2009","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/19305429","citation_count":72,"is_preprint":false},{"pmid":"9278521","id":"PMC_9278521","title":"NAC-1, a rat brain mRNA, is increased in the nucleus accumbens three weeks after chronic cocaine self-administration.","date":"1997","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/9278521","citation_count":72,"is_preprint":false},{"pmid":"30442370","id":"PMC_30442370","title":"LncRNA LINC00319 accelerates ovarian cancer progression through miR-423-5p/NACC1 pathway.","date":"2018","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30442370","citation_count":69,"is_preprint":false},{"pmid":"17804717","id":"PMC_17804717","title":"NAC-1 controls cell growth and survival by repressing transcription of Gadd45GIP1, a candidate tumor suppressor.","date":"2007","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/17804717","citation_count":64,"is_preprint":false},{"pmid":"10934270","id":"PMC_10934270","title":"NAC-1 is a brain POZ/BTB protein that can prevent cocaine-induced sensitization in the rat.","date":"2000","source":"The Journal of neuroscience : the official journal of the Society for 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POZ/BTB domain in its first 120 amino acids; this domain mediates protein-protein interactions among transcriptional regulators. NAC-1 mRNA is selectively increased in the nucleus accumbens after chronic cocaine self-administration.\",\n      \"method\": \"cDNA cloning, sequence analysis, in situ hybridization\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — structural inference from sequence plus expression data; single lab, foundational identification paper\",\n      \"pmids\": [\"9278521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"NAC-1 acts as a transcriptional repressor localized to neuronal nuclei. Transfection of NAC-1 in cell culture repressed transcription of a reporter gene. NAC-1 interacted with other POZ/BTB proteins in mammalian two-hybrid assays via its POZ/BTB domain. Adenoviral overexpression of NAC-1 in the rat nucleus accumbens prevented the development (but not the expression) of cocaine-induced behavioral sensitization.\",\n      \"method\": \"Reporter gene assay (transcriptional repression), mammalian two-hybrid, nuclear localization by immunofluorescence, adenoviral overexpression in vivo\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, two-hybrid, in vivo adenoviral OE), single lab\",\n      \"pmids\": [\"10934270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Antisense knockdown of NAC-1 in the nucleus accumbens enhanced the motor stimulant response to acute cocaine without increasing dopamine release, but increased behavioral response to intra-accumbens dopamine injection; suggesting NAC-1 induction by cocaine is a compensatory mechanism regulating postsynaptic dopamine transmission.\",\n      \"method\": \"Antisense oligonucleotide microinjection into nucleus accumbens, in vivo microdialysis, behavioral assay\",\n      \"journal\": \"Synapse\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean in vivo loss-of-function with defined behavioral and neurochemical readouts; single lab, single study\",\n      \"pmids\": [\"10400893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NAC-1 homooligomerizes through its BTB/POZ domain, forming discrete nuclear bodies. Expression of a dominant-negative BTB/POZ-domain-only mutant disrupts these NAC-1 nuclear bodies, prevents tumor formation, and promotes tumor cell apoptosis. Full-length NAC-1 overexpression enhances tumorigenicity, demonstrating that BTB/POZ-mediated homodimerization is essential for oncogenic function.\",\n      \"method\": \"Co-immunoprecipitation, double immunofluorescence, dominant-negative mutant expression, mouse xenograft model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus dominant-negative functional rescue in vivo, replicated across multiple cell lines and in vivo models\",\n      \"pmids\": [\"17130457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"NAC-1 acts as a transcriptional repressor of Gadd45GIP1 (growth arrest and DNA-damage-inducible 45-gamma interacting protein). NAC-1 knockdown in SKOV3 and HeLa cells induced Gadd45GIP1 expression transcriptionally; engineered NAC-1 expression in NAC-1-negative cells suppressed endogenous Gadd45GIP1. Induction of dominant-negative NAC-1 conferred a growth-inhibitory effect partially reversible by Gadd45GIP1 knockdown. Gadd45GIP1 overexpression caused growth arrest in vitro and in vivo.\",\n      \"method\": \"SAGE, siRNA knockdown, engineered overexpression, dominant-negative induction, in vitro and in vivo growth assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (SAGE discovery, siRNA KD, OE, dominant-negative epistasis) in multiple cell lines and in vivo\",\n      \"pmids\": [\"17804717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NAC-1 homodimerization (via BTB/POZ domain) contributes to paclitaxel resistance through negative regulation of the Gadd45 pathway. NAC-1 knockdown or disruption of homodimerization by dominant-negative BTB/POZ induced Gadd45gamma expression, which interacted with Gadd45gip1. Ectopic NAC-1 or Gadd45gip1 knockdown conferred paclitaxel resistance; NAC-1 knockdown or Gadd45gip1 overexpression increased paclitaxel sensitivity.\",\n      \"method\": \"siRNA knockdown, ectopic expression, dominant-negative BTB/POZ construct, shRNA, ex vivo drug resistance assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic manipulations with defined mechanistic pathway (NAC-1 → Gadd45GIP1/Gadd45 axis), replicated across cell lines and patient tissues\",\n      \"pmids\": [\"19305429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A recurrent de novo heterozygous NACC1 variant c.892C>T (p.Arg298Trp) causes a neurodevelopmental syndrome (microcephaly, epilepsy, cataracts, profound developmental delay). The same variant was identified in 7 independent patients by whole-exome sequencing, establishing NACC1 as a germline disease gene with selective constraint against missense variants.\",\n      \"method\": \"Whole-exome sequencing in 17,228 individuals, statistical analysis of variant recurrence\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Strong — genetic discovery in large cohort with genome-wide significance, but no in vitro/in vivo functional mechanism established in this paper\",\n      \"pmids\": [\"28132692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The disease-associated Nacc1-R284W (murine homolog of human R298W) mutation impairs glutamatergic neurotransmission in a cell-autonomous dominant-negative manner in autaptic neurons. Novel Nacc1 interaction partners identified in the brain include SynGAP1, GluK2A, and several SUMO E3 ligases. The R284W mutant shows reduced binding to SynGAP1 and GluK2A, and greatly increased SUMOylation. Ablating SUMOylation of R284W partially restored SynGAP1 binding but not GluK2A binding.\",\n      \"method\": \"Autaptic neuron electrophysiology, co-immunoprecipitation/pulldown (interaction partners), SUMOylation biochemical assays, mutagenesis\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — electrophysiological functional assay plus biochemical interaction mapping with mutagenesis, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"37533751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The Nacc1 R284W knock-in mouse model of the human R298W mutation exhibits epileptiform discharges, behavioral seizures, hindlimb clasping, and altered EEG power spectral distribution. RNA-seq of P14 mutant cortex revealed >1,000 differentially expressed genes: synaptic genes (postsynapse, ion channels) were upregulated and glial/metabolic/mitochondrial genes were downregulated. Synaptic protein levels were altered. NACC1 nuclear immunoreactivity increased in cortical pyramidal neurons and parvalbumin interneurons but not in astrocytes or oligodendroglia. Homozygosity worsened phenotypes.\",\n      \"method\": \"Knock-in mouse model, EEG, RNA-seq, immunohistochemistry, western blot, behavioral assays\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo methods (EEG, RNA-seq, IHC, behavioral) in a genetically defined mouse model with dose-response (het vs. hom)\",\n      \"pmids\": [\"38388424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRM197 (HB-EGF inhibitor) reverses paclitaxel resistance in ovarian cancer cells at least in part by downregulating NAC-1 and its downstream Gadd45gip1/Gadd45 pathway, activating the proapoptotic JNK/p38MAPK pathway and enhancing caspase-3 activity. This places NACC-1 downstream of HB-EGF signaling in the paclitaxel resistance pathway.\",\n      \"method\": \"In vitro drug treatment, western blot, apoptosis assay, in vivo xenograft\",\n      \"journal\": \"Cancer medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, pharmacological intervention with pathway readouts but no direct genetic epistasis for NACC1 position\",\n      \"pmids\": [\"31490008\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NACC1 acts as a key transcriptional regulator of RIPK3 in macrophages through an NF-κB-linked pathway. In PNPLA3-148M macrophages under lipotoxic stress, NF-κB upregulates NACC1, which in turn drives RIPK3 expression and phosphorylation, promoting necroptosis and pro-inflammatory cytokine secretion. Genetic or pharmacological inhibition of NACC1 reduced RIPK3, suppressed necroptosis, and lowered inflammatory cytokines.\",\n      \"method\": \"iPSC-derived multicellular liver culture, single-cell RNA-seq, genetic knockdown, pharmacological inhibition (NIC3), integrative transcriptomic analysis\",\n      \"journal\": \"Hepatology communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — genetic KD plus pharmacological inhibition with defined pathway readouts (RIPK3, cytokines), but single lab and relatively novel finding\",\n      \"pmids\": [\"41564367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NACC1 directly binds gene-regulatory regions and promotes chromatin accessibility to induce expression of totipotency genes, zygotic genome activation genes, and totipotency-associated retrotransposons in mouse embryonic stem cells. These NACC1-regulated retrotransposons further modulate expression of proximal totipotency genes, forming a coherent feed-forward regulatory mechanism. NACC1 is also required for embryogenesis progression beyond the totipotency stage.\",\n      \"method\": \"Single-cell proteomics, single-cell transcriptomics, chromatin accessibility assays (ATAC-seq or equivalent), genomics (ChIP-seq or CUT&RUN), loss-of-function in embryos\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genomics methods (binding, chromatin accessibility, transcriptomics) with functional in vivo embryo data; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.14.682353\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NACC1 regulates ADAM9 expression, and the NACC1/ADAM9/PI3K/AKT axis sustains AML cell survival. NACC1 knockdown inhibited PI3K/AKT signaling, promoted apoptosis, suppressed proliferation, and caused G0/G1 arrest. ADAM9 was downregulated upon NACC1 knockdown, and AKT activator SC79 restored proliferation inhibited by either NACC1 or ADAM9 knockdown.\",\n      \"method\": \"Lentiviral knockdown, flow cytometry, proliferation assays, western blot, AKT activator rescue\",\n      \"journal\": \"International journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic KD with epistatic rescue (SC79), multiple readouts; single lab\",\n      \"pmids\": [\"39898241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"circNRIP1 interacts with the KH1/2 domain of IGF2BP1 (an m6A reader), blocking its activity and thereby reducing NACC1 mRNA stability, leading to suppression of colorectal tumorigenesis. This places NACC1 mRNA as a downstream target whose stability is regulated by IGF2BP1-mediated m6A reading.\",\n      \"method\": \"RNA pull-down, proteomic analysis, RNA immunoprecipitation-PCR, in vitro and in vivo proliferation/tumorigenesis assays\",\n      \"journal\": \"Gastroenterology report\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNA pull-down with proteomics and RIP-PCR define mechanism; functional in vivo data; single lab\",\n      \"pmids\": [\"40584151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ESC-derived cortical neurons homozygous or heterozygous for the NACC1 R298W mutation express higher NACC1 protein levels and show altered expression of transcripts involved in pre- and postsynaptic signaling, neurotransmission, extracellular matrix, and adhesion. Increased protein levels of presynaptic SNAP25 and VAMP2 and postsynaptic SYNGAP1 were observed. Mutant neural stem cells showed increased adhesion to collagen 1 and 4. Transcriptional profiling indicated a shift in dorsal-ventral patterning toward a ventral signature.\",\n      \"method\": \"Genome-edited human isogenic ESCs, cortical neuron differentiation, RNA-seq, western blot, adhesion functional assay, qPCR\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isogenic human cell model with multiple orthogonal readouts (RNA-seq, western blot, functional adhesion assay); single lab\",\n      \"pmids\": [\"40910719\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NACC1 (NAC-1) is a BTB/POZ- and BEN-domain-containing transcriptional repressor that homodimerizes via its BTB/POZ domain to form discrete nuclear bodies; it suppresses target genes including Gadd45GIP1 to promote cell growth and survival, mediates paclitaxel resistance through the Gadd45 pathway downstream of HB-EGF/NAC-1 signaling, regulates glutamatergic neurotransmission and interacts with SynGAP1 and GluK2A (interactions impaired by the disease-associated R298W mutation which also causes hyperSUMOylation), drives totipotency-gene expression by binding regulatory chromatin and establishing a retrotransposon-mediated feed-forward loop, and controls macrophage necroptosis through an NF-κB–NACC1–RIPK3 axis; a recurrent de novo R298W missense mutation causes a severe neurodevelopmental syndrome by dominantly impairing these neuronal functions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NACC1 (NAC-1) is a BTB/POZ-domain transcriptional repressor that homooligomerizes through its BTB/POZ domain to form discrete nuclear bodies, an interaction that is essential for its function: a BTB/POZ-only dominant-negative construct disrupts these bodies, blocks tumor formation, and triggers apoptosis [#0, #3]. A principal repression target is Gadd45GIP1; NACC1 silences Gadd45GIP1 transcriptionally to sustain cell growth, and disruption of NACC1 homodimerization de-represses the Gadd45 pathway, defining a NACC1\\u2192Gadd45GIP1/Gadd45 axis that controls proliferation and paclitaxel sensitivity downstream of HB-EGF signaling [#4, #5, #9]. This pro-survival regulatory activity recurs across malignancies, where NACC1 sustains an ADAM9/PI3K/AKT survival axis in AML and drives an NF-\\u03baB\\u2013NACC1\\u2013RIPK3 axis governing macrophage necroptosis and inflammatory cytokine output under lipotoxic stress [#10, #12]. In early development NACC1 binds gene-regulatory chromatin and promotes accessibility to induce totipotency genes and totipotency-associated retrotransposons in a feed-forward loop required for embryogenesis [#11]. In the nervous system NACC1 was first identified as a cocaine-inducible repressor in the nucleus accumbens that regulates postsynaptic dopamine transmission [#1, #2]; it also interacts with the synaptic proteins SynGAP1 and GluK2A to support glutamatergic neurotransmission [#7]. A recurrent de novo heterozygous p.Arg298Trp variant causes a severe neurodevelopmental syndrome (microcephaly, epilepsy, cataracts, profound developmental delay) [#6], acting in a dominant-negative manner that impairs SynGAP1/GluK2A binding, drives hyperSUMOylation, and produces seizures and transcriptional dysregulation of synaptic and glial genes in knock-in mice and human isogenic neurons [#7, #8, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established NAC-1 as a candidate transcriptional regulator by identifying its POZ/BTB protein-interaction domain and its cocaine-inducible expression in the nucleus accumbens.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, and in situ hybridization after chronic cocaine self-administration\",\n      \"pmids\": [\"9278521\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct transcriptional activity demonstrated\", \"Target genes unknown\", \"Domain function inferred from sequence only\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined NAC-1 induction as a compensatory regulator of postsynaptic dopamine transmission, linking it functionally to drug-response circuitry.\",\n      \"evidence\": \"Antisense knockdown in nucleus accumbens with microdialysis and behavioral readouts\",\n      \"pmids\": [\"10400893\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular targets mediating the dopamine effect unidentified\", \"Single in vivo study\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Demonstrated that NAC-1 is a bona fide nuclear transcriptional repressor acting via POZ/BTB protein interactions and is required for development of cocaine sensitization.\",\n      \"evidence\": \"Reporter gene repression assay, mammalian two-hybrid, immunofluorescence, and in vivo adenoviral overexpression\",\n      \"pmids\": [\"10934270\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Repressed endogenous target genes not identified\", \"Interaction partners not named\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed that BTB/POZ-mediated homooligomerization into nuclear bodies is mechanistically essential for NAC-1's oncogenic, anti-apoptotic function.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence, dominant-negative BTB/POZ expression, and mouse xenografts\",\n      \"pmids\": [\"17130457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify downstream effector genes\", \"Structural basis of oligomerization not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified Gadd45GIP1 as a direct transcriptional target whose repression by NAC-1 drives cell growth, providing a concrete effector for its oncogenic activity.\",\n      \"evidence\": \"SAGE, siRNA knockdown, engineered overexpression, dominant-negative epistasis, and growth assays in vitro and in vivo\",\n      \"pmids\": [\"17804717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct promoter binding not shown\", \"Cofactors of repression undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended the NAC-1/Gadd45 axis to chemoresistance, establishing that homodimerization-dependent Gadd45 repression confers paclitaxel resistance.\",\n      \"evidence\": \"siRNA/shRNA knockdown, ectopic expression, dominant-negative BTB/POZ, and ex vivo drug resistance assays\",\n      \"pmids\": [\"19305429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting Gadd45 to mitotic drug response not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established NACC1 as a human germline disease gene by identifying a recurrent de novo p.Arg298Trp variant causing a neurodevelopmental syndrome.\",\n      \"evidence\": \"Whole-exome sequencing in a large cohort with statistical recurrence analysis\",\n      \"pmids\": [\"28132692\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional mechanism established in this study\", \"Dominant-negative vs gain-of-function not distinguished\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed NACC1 downstream of HB-EGF signaling in chemoresistance, showing HB-EGF inhibition downregulates NACC1 and reactivates proapoptotic MAPK signaling.\",\n      \"evidence\": \"Pharmacological HB-EGF inhibition (CRM197), western blot, apoptosis assays, and xenografts\",\n      \"pmids\": [\"31490008\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct genetic epistasis for NACC1 position in the pathway\", \"Single lab pharmacological inference\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the mechanistic basis of the R298W disease variant by showing it impairs glutamatergic transmission, loses SynGAP1/GluK2A binding, and becomes hyperSUMOylated.\",\n      \"evidence\": \"Autaptic neuron electrophysiology, Co-IP/pulldown interaction mapping, SUMOylation assays, and mutagenesis (murine R284W)\",\n      \"pmids\": [\"37533751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GluK2A binding not rescued by removing SUMOylation, leaving that defect mechanistically unexplained\", \"How synaptic partners relate to transcriptional repressor function unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated in vivo that the R284W knock-in mouse recapitulates the human epilepsy phenotype with dose-dependent severity and broad synaptic/glial transcriptional dysregulation.\",\n      \"evidence\": \"Knock-in mouse with EEG, RNA-seq, immunohistochemistry, western blot, and behavioral assays\",\n      \"pmids\": [\"38388424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets driving seizures not pinpointed\", \"Cell-type-specific contributions to phenotype unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Broadened NACC1's role to early development, showing it binds regulatory chromatin and promotes accessibility to induce totipotency genes and retrotransposons in a feed-forward loop.\",\n      \"evidence\": \"Single-cell proteomics/transcriptomics, chromatin accessibility and binding genomics, and loss-of-function in embryos (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.14.682353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Mechanism of accessibility promotion (vs canonical repressor role) unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined NACC1 as a pro-necroptotic transcriptional regulator of RIPK3 within an NF-\\u03baB-linked inflammatory axis under lipotoxic stress.\",\n      \"evidence\": \"iPSC-derived multicellular liver culture, single-cell RNA-seq, genetic knockdown, and pharmacological inhibition\",\n      \"pmids\": [\"41564367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding of NACC1 to RIPK3 regulatory regions not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended NACC1's pro-survival function to AML via an ADAM9/PI3K/AKT axis, and identified its mRNA as an IGF2BP1/m6A-regulated target in colorectal cancer.\",\n      \"evidence\": \"Lentiviral knockdown with AKT-activator rescue (AML); RNA pull-down, RIP-PCR, and tumorigenesis assays (CRC)\",\n      \"pmids\": [\"39898241\", \"40584151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NACC1 directly represses ADAM9 not established\", \"Single lab per finding\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed in a human isogenic system that R298W elevates NACC1 protein and dysregulates synaptic, adhesion, and patterning programs, complementing the mouse phenotype.\",\n      \"evidence\": \"Genome-edited human ESC-derived cortical neurons with RNA-seq, western blot, adhesion assays, and qPCR\",\n      \"pmids\": [\"40910719\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking elevated protein to dominant phenotype unresolved\", \"Relationship between adhesion/patterning changes and clinical features unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NACC1 reconciles its canonical role as a BTB/POZ transcriptional repressor with its chromatin-accessibility-promoting and neuronal synaptic-interaction functions, and how the R298W variant exerts dominance across these contexts, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of NACC1 nuclear bodies or DNA/chromatin engagement\", \"Direct genomic binding sites in disease-relevant neurons unmapped\", \"Unifying mechanism across repressor vs activator behaviors lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 4, 5, 10, 11]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 4, 11]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 5, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 7, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SYNGAP1\", \"GRIK2\", \"GADD45GIP1\", \"IGF2BP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}