{"gene":"CNBP","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1995,"finding":"Recombinant GST-CNBP fusion protein binds to G-rich single-stranded RNA and DNA in a sequence-specific manner, establishing CNBP as a sequence-specific single-stranded nucleic acid binding protein.","method":"In vitro binding assay with recombinant GST-fusion protein","journal":"DNA research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro binding assay with recombinant protein, single lab, single method","pmids":["7788528"],"is_preprint":false},{"year":1998,"finding":"CNBP binds to the 5'UTR of ribosomal protein mRNAs (specifically a downstream region) as a dimer, with binding mutually exclusive with La protein binding; Ro60 autoantigen is required as an ancillary factor for CNBP binding. CNBP multimerizes and its binding is assisted by a protease-sensitive factor involving Ro60.","method":"In vitro binding assays, RNA-protein binding analysis, mutational analysis of 5'UTR","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple binding variants and mutational analysis, single lab but multiple orthogonal approaches","pmids":["9710533"],"is_preprint":false},{"year":2003,"finding":"CNBP protein localizes to the nucleus of cells and strongly stimulates cell proliferation and increases c-myc promoter activity upon overexpression; CNBP is essential for forebrain induction in mouse embryos, and Myc expression was absent in anterior regions of Cnbp-/- embryos, indicating CNBP targets Myc in rostral head formation.","method":"Promoter-trap mutagenesis, transgenic rescue, CAT assay, in vivo mouse knockout","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with defined phenotype, transgenic rescue, reporter assay; replicated across multiple experimental approaches in one study","pmids":["12588852"],"is_preprint":false},{"year":2003,"finding":"CNBP and La proteins bind the 5'UTR of ribosomal protein mRNAs and can relieve TOP-mediated translational repression; CNBP binding to TOP hairpin structures activates translation of ribosomal protein mRNAs, and CNBP also increases cap-independent translation from IRES elements in mammalian cells.","method":"Tetracycline-regulated expression system, SEAP reporter assay in transgenic CHO cells, confocal microscopy","journal":"Biotechnology and bioengineering","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assays in mammalian cells with regulated expression, single lab, two orthogonal methods","pmids":["12432575"],"is_preprint":false},{"year":2006,"finding":"CNBP is required for forebrain specification in chick embryos at organogenesis stage; CNBP silencing abolished expression of forebrain transcription factors BF-1, Six3 and Hesx1 (but not Otx2), while CNBP misexpression induced their ectopic expression in the hindbrain, placing CNBP upstream of these rostral head transcription factors in a pathway parallel to Otx2.","method":"RNAi silencing and retroviral misexpression in chick embryos, in situ hybridization","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function in vivo with specific molecular readouts, single lab, two orthogonal methods","pmids":["16626683"],"is_preprint":false},{"year":2007,"finding":"ZNF9/CNBP and PCBP2 form a holo-ITAF ribonucleoprotein complex that binds the ODC mRNA IRES and stimulates cap-independent translation; ZNF9 specifically associates with wild-type but not mutant IRES sequences.","method":"Proteomics screen (mass spectrometry), biochemical validation of RNA-protein interaction, functional translation assays, co-immunoprecipitation of ZNF9 and PCBP2","journal":"Molecular & cellular proteomics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (MS, Co-IP, biochemical assays, functional translation assays) in single study; mechanistically rigorous","pmids":["17327219"],"is_preprint":false},{"year":2007,"finding":"CNBP mediates neural crest cell expansion by controlling cell proliferation and survival rather than via cell fate switching during rostral head development in zebrafish; morpholino knockdown caused forebrain truncation, reduced proliferation, and increased cell death in anterior regions.","method":"Antisense morpholino oligonucleotide knockdown in zebrafish, in situ hybridization, cell proliferation and death assays","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockdown with specific cellular and molecular phenotypic readouts, single lab, multiple orthogonal methods","pmids":["17471504"],"is_preprint":false},{"year":2007,"finding":"Haploinsufficiency of Znf9 in mice (Znf9+/- mice with significantly decreased Znf9 expression) causes myotonic dystrophy-like phenotype including myotonic discharges, heart conduction abnormalities, and muscle histological changes; Clc1 (skeletal muscle chloride channel 1) expression was dramatically decreased in Znf9+/- mice, and Znf9 transgenic rescue normalized both Znf9, Clc1 and the phenotype.","method":"Mouse genetics (heterozygous knockout, transgenic rescue), EMG, ECG, Western blot, loss-of-function with specific molecular readout","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic model with transgenic rescue, specific molecular target (Clc1) identified, multiple orthogonal methods in single study","pmids":["17335846"],"is_preprint":false},{"year":2008,"finding":"The RGG box of CNBP is essential for RNA-protein binding and nucleic acid chaperone activity; Zn knuckles are required but not individually essential for CNBP biochemical activities; removal of the RGG box allows weak ssDNA binding but abolishes RNA binding; mutants lacking the N-terminal region or RGG box act as dominant negatives in Xenopus neural crest development.","method":"Site-directed mutagenesis, recombinant protein expression/purification in E. coli, in vitro biochemical assays, gain- and loss-of-function in Xenopus embryos","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with in vitro reconstitution and in vivo functional validation; multiple orthogonal approaches in single study","pmids":["18703071"],"is_preprint":false},{"year":2010,"finding":"ZNF9/CNBP associates with actively translating ribosomes and directly binds the ODC mRNA IRES sequence to activate cap-independent translation in primary human myoblasts; this activity is reduced in myoblasts from a DM2 patient.","method":"Polysome profiling, ribosome isolation, direct RNA binding assays, functional IRES translation assay in primary human myoblasts","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (polysome profiling, direct binding, functional assays) with disease-relevant cell model; rigorous mechanistic demonstration","pmids":["20174632"],"is_preprint":false},{"year":2012,"finding":"CNBP associates with the poly(A) binding protein and accumulates in stress granules during arsenite treatment of human cells, implicating CNBP in mRNA handling during stress. The yeast ortholog Gis2 shows RNA-dependent interactions with poly(A) binding protein and eIF4G and localizes to processing bodies and stress granules.","method":"Co-immunoprecipitation, subcellular localization (fluorescence microscopy), polysome/stress granule fractionation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP and localization with functional implication; ortholog evidence provides context, but human CNBP evidence is partially inferred from yeast ortholog","pmids":["23285195"],"is_preprint":false},{"year":2013,"finding":"Human CNBP specifically binds the G-rich sequence of c-myc NHE III1 region and promotes G-quadruplex formation; CNBP induces a transient decrease followed by an increase in c-myc transcription in vivo. The interaction of CNBP with NM23-H2 is responsible for the increase of c-myc transcription, establishing a G-quadruplex-related CNBP/NM23-H2 protein complex at the c-myc promoter.","method":"EMSA, CD spectroscopy, FRET, ChIP, RNA interference, luciferase reporter assay, SPR, co-immunoprecipitation, co-transfection","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple highly orthogonal methods (EMSA, FRET, ChIP, Co-IP, SPR, reporter assay) in a single study establishing mechanism","pmids":["23774591"],"is_preprint":false},{"year":2013,"finding":"CNBP acts as a transcriptional regulator of tbx2b, smarca5, and wnt5b in developing zebrafish embryos; CNBP up-regulates tbx2b and smarca5 and down-regulates wnt5b. The direct interaction between CNBP and candidate gene promoters was confirmed by EMSA and ChIP. CNBP DNA-binding sites are G-enriched sequences with high frequency of putative G-quadruplex secondary structure.","method":"Yeast one-hybrid assay, bioinformatics, EMSA, ChIP, loss-of-function in zebrafish","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with direct binding confirmed by EMSA and ChIP; single lab, multiple orthogonal methods","pmids":["23667590"],"is_preprint":false},{"year":2013,"finding":"In Drosophila, CNBP regulates dMyc translation through an IRES-dependent mechanism; knockdown of dCNBP reduces dMyc protein but not mRNA levels; reintroduction of dMyc in CNBP-deficient wing imaginal discs rescues wing size reduction, establishing a CNBP-Myc translational axis controlling wing development.","method":"Drosophila genetics (knockdown, rescue experiments), Western blot, RT-PCR, wing size measurement, genetic epistasis","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with specific molecular readout and rescue experiment; single lab, multiple orthogonal approaches","pmids":["24275942"],"is_preprint":false},{"year":2013,"finding":"Tag-free recombinant CNBP forms homodimers that coexist with monomers; CNBP has a secondary structure dominated by random-coil and β-sheet corresponding to zinc knuckle motifs; CNBP structural stability increases upon binding single-stranded nucleic acid targets; a conserved tryptophan residue is involved directly or indirectly in nucleic acid binding.","method":"Size-exclusion HPLC, circular dichroism spectroscopy, fluorescence spectroscopy, recombinant protein purification","journal":"Protein expression and purification","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple biophysical methods on purified recombinant protein; single lab, rigorous in vitro characterization","pmids":["24161561"],"is_preprint":false},{"year":2014,"finding":"CNBP modulates transcription of Wnt signaling pathway components (cdk14, ptk7, tcf7l2) in a dose-dependent fashion in developing zebrafish embryos, which in turn affects c-myc, ccnd1 and axin2 expression. CNBP down-regulates Wnt5 transcription.","method":"Loss-of-function in zebrafish, RT-PCR, bioinformatics for CNBP binding site identification","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with defined molecular targets and pathway placement; single lab, multiple gene targets examined","pmids":["25151948"],"is_preprint":false},{"year":2017,"finding":"CNBP acts as a transcription factor binding specific motifs in the promoter region of sustained inflammatory cytokines (particularly IL-6); LPS induces CNBP expression via NF-κB and autoregulation; LPS-induced phosphorylation-mediated CNBP dimerization is required for its nuclear translocation; cnbp-depleted zebrafish are highly susceptible to Shigella flexneri infection.","method":"ChIP, dual-luciferase assay, zebrafish knockdown, nuclear translocation assays, infection model","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating direct DNA binding, functional reporter assays, in vivo knockdown with phenotypic rescue; multiple orthogonal methods across cell and animal models","pmids":["28168305"],"is_preprint":false},{"year":2017,"finding":"CNBP cooperates with lncRNA LAST to bind the 5'UTR of CCND1 mRNA and protect it from nuclease degradation, stabilizing CCND1 mRNA. CNBP RIP-seq and LAST RNA-seq identified CCND1 mRNA and three additional mRNA targets as post-transcriptional targets of the CNBP-LAST complex.","method":"RIP-seq, RNA-seq, CNBP-LAST binding assay, mRNA stability assays, xenograft model","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq and functional stability assays; single lab, multiple orthogonal methods","pmids":["29199958"],"is_preprint":false},{"year":2018,"finding":"CNBP resides in the cytosol of macrophages and translocates to the nucleus in response to microbial pathogens and pathogen-derived products; nuclear translocation and DNA-binding activity of c-Rel (a driver of IL-12β transcription) requires CNBP; Cnbp-deficient macrophages exhibit impaired c-Rel activation without affecting canonical NF-κB/Rel signaling; Cnbp-deficient mice show reduced IL-12β and impaired Th1 IFN-γ response.","method":"Cnbp knockout mice, nuclear translocation assays, c-Rel DNA binding assay, infection model (toxoplasmosis), cytokine measurements","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with specific molecular mechanism (c-Rel pathway), nuclear translocation assay, in vivo infection model; multiple orthogonal methods","pmids":["30442645"],"is_preprint":false},{"year":2019,"finding":"CNBP acts in vitro as a G-quadruplex (G4)-unfolding protein over tetramolecular G4 formed by TG4T and over G4s in promoters of oncogenes (KRAS, NOGGIN); CNBP depletion reduces KRAS transcription in cellulo, suggesting CNBP relieves G4-mediated transcriptional silencing; CNBP unfolds the G4 in the NOG promoter and represses NOG transcription in zebrafish, establishing a G4-unfolding mechanism for CNBP transcriptional control.","method":"In vitro G4-unfolding assay, CNBP depletion in cells, RT-qPCR, zebrafish in vivo experiments","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro biochemical G4-unfolding reconstitution combined with cell depletion and in vivo zebrafish experiments; multiple orthogonal methods","pmids":["31219592"],"is_preprint":false},{"year":2020,"finding":"CNBP binding to lncRNA Braveheart (Bvht) remodels the 3-D structure of Bvht; Bvht has a well-defined but flexible 3-D structure in solution that changes upon CNBP binding; CNBP binding requires multiple domains of Bvht and the RHT/AGIL RNA motif, which contains a highly flexible loop surrounded by ordered helices.","method":"Small angle X-ray scattering (SAXS), structural ensemble analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous 3-D structural study using SAXS with functional domain mapping; single lab but high-quality structural method","pmids":["31919376"],"is_preprint":false},{"year":2021,"finding":"Drosophila CNBP (dCNBP) controls polyamine metabolism by binding dOdc mRNA and regulating its translation; depletion of dCNBP in muscles reduces ODC protein and polyamine levels, causing age-dependent locomotor defects; locomotor defects are rescued by polyamine supplementation or dOdc1 overexpression. The CNBP-polyamine axis is also reduced in muscles from DM2 patients.","method":"Drosophila muscle-specific knockdown, mRNA binding assays, ODC and polyamine measurements, locomotor assays, rescue experiments, analysis of DM2 patient muscle","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockdown with specific molecular target (ODC/polyamine), rescue by supplementation and overexpression, ortholog evidence; validated in patient samples","pmids":["34517941"],"is_preprint":false},{"year":2021,"finding":"CNBP binds and promotes unfolding of G-quadruplexes formed by both positive-sense and negative-sense RNA strands of SARS-CoV-2; CNBP is the main human cellular protein bound to SARS-CoV-2 RNA genome.","method":"Multiple biophysical techniques (confirmed G4 formation), molecular binding approaches, G4-unfolding assays with purified CNBP","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical G4-unfolding assay with multiple biophysical techniques; single lab, confirms CNBP as main binding protein","pmids":["33807682"],"is_preprint":false},{"year":2022,"finding":"CNBP undergoes phosphorylation-induced nuclear translocation in response to RNA sensing pathways; nuclear CNBP binds IFNβ enhancer DNA and activates IFNβ gene transcription during SARS-CoV-2 infection; CNBP also binds SARS-CoV-2 viral RNA directly and competes with the nucleocapsid (N) protein to prevent viral RNA and N protein from undergoing liquid-liquid phase separation (LLPS), limiting viral replication. CNBP-deficient mice have higher viral loads and succumb rapidly to infection.","method":"CNBP-deficient mice, viral load measurement, direct RNA binding assay, LLPS competition assay, IFNβ reporter/transcription assay","journal":"Research square (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mouse knockout with viral phenotype, direct binding and LLPS assays; preprint, not yet peer-reviewed","pmids":["35547851"],"is_preprint":true},{"year":2023,"finding":"KPNB1 (karyopherin subunit beta 1) is responsible for nuclear transport of CNBP; liquid condensates (phase separation) of CNBP repress SWI/SNF core subunit SMARCC2 activity via direct interaction, leading to increased SMARCC1/SMARCA4 binary complex activity that facilitates 18S rRNA processing; blocking CNBP phase separation with a cell-penetrating peptide inhibits ribosome biogenesis.","method":"Co-immunoprecipitation, mass spectrometry, ChIP, dual-luciferase reporter assay, cell-penetrating peptide functional assay, gain- and loss-of-function in neuroblastoma cells","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and MS for interaction, functional phase separation assay; single lab, multiple orthogonal methods","pmids":["37186134"],"is_preprint":false},{"year":2024,"finding":"CNBP transcriptionally regulates TCOF1 by binding G-quadruplex sequences (PQSs) in its promoter; CNBP binds both G4-folded and unfolded forms of TCOF1 promoter PQS sequences with nM affinity in vitro; ChIP confirms CNBP binding to TCOF1 promoter in HeLa cells; in zebrafish, both cnbp overexpression and knockdown induce nolc1 (TCOF1 ortholog) transcription, suggesting CNBP modulates TCOF1 transcription through G-quadruplex folding/unfolding.","method":"Circular dichroism, fluorescence binding assays, ChIP in HeLa cells, luciferase reporter assay, zebrafish morpholino knockdown/overexpression, antisense oligonucleotide G4 disruption","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro biochemical binding with Kd values, ChIP confirmation, functional reporter assay, and in vivo zebrafish validation; multiple orthogonal methods","pmids":["38553547"],"is_preprint":false},{"year":2025,"finding":"CNBP forms a motor-adaptor complex with the KIF1C kinesin; CNBP directly binds GA-rich sequences in the 3'UTR of protrusion-targeted mRNAs; CNBP interacts with KIF1C and is required for KIF1C recruitment to mRNA cargo and active transport of mRNAs on microtubules to peripheral protrusions of mammalian cells; this trafficking is important for cell migration.","method":"Direct RNA binding assays (CNBP-3'UTR interaction), protein-protein interaction assays (CNBP-KIF1C), mRNA localization assays, loss-of-function with specific readout (mRNA trafficking, KIF1C recruitment)","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assays for RNA and protein interactions, loss-of-function with specific mechanistic readout (KIF1C recruitment), multiple orthogonal methods in single study","pmids":["39982819"],"is_preprint":false},{"year":2025,"finding":"CNBP protein stability is regulated by pAMPK-dependent phosphorylation; CNBP interacts with pAMPK; in DM2 cells active pAMPK is reduced, leading to decreased CNBP stability; treatment with AMPK activator A769662 corrects CNBP stability and normalizes CNBP target expression in DM2 fibroblasts.","method":"Co-immunoprecipitation (CNBP-pAMPK), Western blot for pAMPK levels, small molecule AMPK activator treatment in DM2 fibroblasts, Cnbp KO mouse MRI/DTI analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, pharmacological rescue in disease cell model; single lab, two orthogonal approaches","pmids":["39807631"],"is_preprint":false}],"current_model":"CNBP (ZNF9) is a conserved multi-zinc-knuckle, RGG-box-containing single-stranded nucleic acid binding protein that functions as both a transcriptional and translational regulator: it unfolds G-quadruplex structures in gene promoters to control transcription (of c-MYC, KRAS, IL-6, IL-12β, TCOF1, and others), acts as a nucleic acid chaperone to remodel RNA secondary structures, activates cap-independent (IRES-mediated) translation of target mRNAs (including ODC and Myc) by associating with actively translating ribosomes, stabilizes mRNAs by binding their 5'UTR in cooperation with partner proteins, forms a motor-adaptor complex with KIF1C kinesin for active microtubule-dependent mRNA transport to cell protrusions, undergoes phosphorylation-induced nuclear translocation (regulated by pAMPK and in response to inflammatory signals), and is required for neural crest expansion, forebrain development, and innate immune responses in multiple vertebrate model systems."},"narrative":{"mechanistic_narrative":"CNBP (ZNF9) is a conserved single-stranded nucleic acid-binding protein that operates as both a transcriptional and post-transcriptional regulator of gene expression, with roles spanning vertebrate head/neural crest development, innate immunity, and intracellular mRNA logistics [PMID:12588852, PMID:28168305]. Its biochemical core is a multi-zinc-knuckle, RGG-box architecture: it binds G-rich single-stranded RNA and DNA sequence-specifically [PMID:7788528], and the RGG box is essential for RNA binding and nucleic acid chaperone activity while removal converts it to a dominant negative in vivo [PMID:18703071]. At the transcriptional level CNBP recognizes G-quadruplex-forming promoter elements and acts as a G4-unfolding/remodeling factor, controlling transcription of c-MYC (via a CNBP/NM23-H2 complex at NHE III1) [PMID:23774591], KRAS and NOGGIN [PMID:31219592], TCOF1 [PMID:38553547], and developmental genes including tbx2b, smarca5, wnt5b and Wnt-pathway components [PMID:23667590, PMID:25151948]. Post-transcriptionally, CNBP activates cap-independent (IRES-mediated) translation by associating with translating ribosomes and forming a holo-ITAF complex with PCBP2 on the ODC mRNA IRES [PMID:17327219, PMID:20174632], drives an ODC/polyamine translational axis [PMID:34517941], stabilizes CCND1 mRNA in cooperation with lncRNA LAST [PMID:29199958], remodels lncRNA 3-D structure such as Braveheart [PMID:31919376], and forms a motor-adaptor complex with the KIF1C kinesin to traffic 3'UTR GA-rich mRNAs to cell protrusions for migration [PMID:39982819]. In innate immunity CNBP is a cytosolic factor that, upon phosphorylation-induced dimerization and nuclear translocation, drives transcription of inflammatory cytokines including IL-6 and supports c-Rel-dependent IL-12β expression [PMID:28168305, PMID:30442645]. Its activity is gated by regulated nuclear import via KPNB1 and by pAMPK-dependent phosphorylation that controls CNBP protein stability [PMID:37186134, PMID:39807631]. Loss of one Znf9 allele in mice produces a myotonic dystrophy-like phenotype with reduced chloride channel Clc1 expression, and CNBP-dependent IRES/polyamine activity is impaired in DM2 patient cells [PMID:17335846, PMID:20174632, PMID:34517941].","teleology":[{"year":1995,"claim":"Established the fundamental biochemical activity of CNBP: that it is a sequence-specific single-stranded nucleic acid binding protein, defining the molecular basis for all later regulatory roles.","evidence":"In vitro binding assay with recombinant GST-CNBP on G-rich ssRNA/ssDNA","pmids":["7788528"],"confidence":"Medium","gaps":["Single in vitro method, no cellular targets identified","Did not distinguish DNA vs RNA functional preference","No structural determinant of specificity defined"]},{"year":1998,"claim":"First placed CNBP on a specific mRNA element (ribosomal protein 5'UTRs) and showed it acts as a multimer with ancillary factors, hinting at a translational regulatory function.","evidence":"In vitro RNA-protein binding and 5'UTR mutational analysis; competition with La and dependence on Ro60","pmids":["9710533"],"confidence":"Medium","gaps":["Functional translational consequence not demonstrated in this study","Ro60 dependence mechanism unresolved","In vitro only"]},{"year":2003,"claim":"Connected CNBP to a defined developmental program and a transcriptional target, showing it drives proliferation and Myc expression and is required for forebrain/rostral head formation.","evidence":"Mouse Cnbp knockout with transgenic rescue, c-myc promoter CAT/reporter assays, overexpression proliferation assays; plus reporter studies of TOP/IRES translational activation","pmids":["12588852","12432575"],"confidence":"High","gaps":["Whether Myc regulation is transcriptional, translational or both not fully separated","Direct promoter binding not shown in knockout study","Mechanism of TOP/IRES activation not molecularly defined"]},{"year":2006,"claim":"Refined CNBP's developmental role by placing it upstream of specific forebrain transcription factors in a pathway parallel to Otx2.","evidence":"RNAi silencing and retroviral misexpression in chick embryos with in situ readouts of BF-1, Six3, Hesx1","pmids":["16626683"],"confidence":"Medium","gaps":["Direct vs indirect regulation of these TFs unresolved","No biochemical promoter binding shown","Molecular activity (transcription vs translation) not distinguished"]},{"year":2007,"claim":"Resolved how CNBP supports proliferation in vivo and defined a concrete translational mechanism, showing it forms a holo-ITAF with PCBP2 on the ODC IRES and controls neural crest cell number rather than fate.","evidence":"Proteomics/Co-IP identifying PCBP2, IRES translation assays; zebrafish morpholino knockdown with proliferation/death readouts","pmids":["17327219","17471504"],"confidence":"High","gaps":["Stoichiometry of the CNBP-PCBP2 ITAF complex not defined","Generalizability beyond ODC IRES not established here","Link between IRES activity and proliferation phenotype indirect"]},{"year":2007,"claim":"Established the disease relevance of CNBP dosage, showing Znf9 haploinsufficiency produces a myotonic dystrophy-like phenotype tied to reduced Clc1 chloride channel expression.","evidence":"Znf9+/- mice with EMG/ECG/histology and transgenic rescue, Clc1 Western blot","pmids":["17335846"],"confidence":"High","gaps":["Mechanism linking CNBP to Clc1 expression not defined","Whether effect is transcriptional or post-transcriptional unclear","Does not address DM2 repeat-expansion sequestration models directly"]},{"year":2008,"claim":"Mapped the structural determinants of CNBP function, demonstrating the RGG box is essential for RNA binding and chaperone activity and that domain-deletion mutants act as dominant negatives in vivo.","evidence":"Site-directed mutagenesis with in vitro biochemical assays and gain/loss-of-function in Xenopus neural crest","pmids":["18703071"],"confidence":"High","gaps":["High-resolution structure of nucleic-acid-bound CNBP absent","Individual zinc-knuckle contributions only partially resolved","Chaperone mechanism not visualized"]},{"year":2010,"claim":"Linked the IRES-translation mechanism directly to disease, showing CNBP associates with translating ribosomes and binds the ODC IRES, with reduced activity in DM2 patient myoblasts.","evidence":"Polysome profiling, ribosome isolation, direct RNA binding, IRES translation assay in primary human myoblasts","pmids":["20174632"],"confidence":"High","gaps":["Cause of reduced activity in DM2 cells (protein level vs sequestration) not pinpointed here","Full set of CNBP-dependent IRES mRNAs not enumerated","Ribosome association mechanism undefined"]},{"year":2012,"claim":"Placed CNBP in stress-responsive mRNA handling by showing it associates with poly(A) binding protein and accumulates in stress granules, with conserved behavior of the yeast ortholog Gis2.","evidence":"Co-IP, fluorescence localization, and polysome/stress-granule fractionation in human cells plus yeast ortholog analysis","pmids":["23285195"],"confidence":"Medium","gaps":["Functional consequence of stress-granule localization not established","Human CNBP role partly inferred from yeast Gis2","Direct vs RNA-bridged PABP interaction not fully resolved"]},{"year":2013,"claim":"Defined CNBP's signature transcriptional mechanism — binding G-rich promoter sequences and modulating G-quadruplex structures — and identified protein partners and direct developmental targets.","evidence":"EMSA/CD/FRET/ChIP/SPR/Co-IP at the c-myc NHE III1 with NM23-H2; yeast one-hybrid, EMSA, ChIP and zebrafish loss-of-function for tbx2b/smarca5/wnt5b; biophysics of CNBP dimerization and ssNA-induced stabilization; Drosophila IRES-dependent dMyc translation control","pmids":["23774591","23667590","24161561","24275942"],"confidence":"High","gaps":["Whether CNBP folds or unfolds G4 at c-myc not fully reconciled across targets","Role of NM23-H2 partnership generality unknown","Coordination of dual transcriptional/translational Myc control unclear"]},{"year":2014,"claim":"Extended CNBP's transcriptional reach into Wnt signaling, showing dose-dependent regulation of Wnt pathway components that feed back onto c-myc/ccnd1/axin2.","evidence":"Zebrafish loss-of-function with RT-PCR of cdk14, ptk7, tcf7l2, wnt5","pmids":["25151948"],"confidence":"Medium","gaps":["Direct promoter binding for all targets not shown","Dose-dependence mechanism unexplained","Downstream phenotypic consequence not quantified"]},{"year":2017,"claim":"Established CNBP as a regulated innate-immune transcription factor and an mRNA-stabilizing factor, showing inducible nuclear translocation driving inflammatory cytokine transcription and lncRNA-assisted CCND1 mRNA stabilization.","evidence":"ChIP, dual-luciferase, phosphorylation-dependent nuclear translocation, zebrafish Shigella infection for IL-6 axis; RIP-seq/RNA-seq and stability assays for the CNBP-LAST-CCND1 axis","pmids":["28168305","29199958"],"confidence":"High","gaps":["Identity of the kinase driving CNBP dimerization not defined here","Full inflammatory target set incomplete","Mechanism of LAST-CNBP cooperativity at the molecular level unresolved"]},{"year":2018,"claim":"Defined a specific innate-immune signaling mechanism in macrophages, showing cytosol-to-nucleus translocation of CNBP is required for c-Rel activation and Th1-polarizing IL-12β expression independent of canonical NF-κB.","evidence":"Cnbp knockout mice, nuclear translocation and c-Rel DNA-binding assays, Toxoplasma infection and cytokine measurements","pmids":["30442645"],"confidence":"High","gaps":["Direct vs indirect CNBP-c-Rel interaction not fully defined","Signal/kinase triggering translocation not identified","Relationship to G4/transcriptional mechanism unclear"]},{"year":2019,"claim":"Resolved the directionality of CNBP's G-quadruplex action, demonstrating it unfolds G4 structures to relieve transcriptional silencing of oncogene promoters.","evidence":"In vitro G4-unfolding assays, cellular CNBP depletion with RT-qPCR (KRAS), and zebrafish in vivo NOG repression","pmids":["31219592"],"confidence":"High","gaps":["Reconciliation with G4-promoting activity at c-myc not addressed","Genome-wide G4 targets not mapped","Kinetics of unfolding in vivo unknown"]},{"year":2020,"claim":"Demonstrated CNBP's RNA chaperone activity on a functional lncRNA, showing it remodels the 3-D structure of Braveheart via a defined RNA motif.","evidence":"SAXS and structural ensemble analysis of Bvht with and without CNBP","pmids":["31919376"],"confidence":"High","gaps":["Functional/cellular consequence of remodeling not tested here","Atomic-resolution structure of complex absent","Which CNBP domains contact the RHT/AGIL motif not mapped"]},{"year":2021,"claim":"Connected CNBP's ODC IRES-translation activity to a physiological polyamine axis with disease relevance and extended its G4-unfolding role to a viral RNA genome.","evidence":"Drosophila muscle knockdown with dOdc/polyamine measurements, rescue, and DM2 patient muscle analysis; in vitro G4-unfolding of SARS-CoV-2 +/- strand RNA","pmids":["34517941","33807682"],"confidence":"High","gaps":["Mammalian counterpart of the polyamine axis not directly tested","In vivo antiviral consequence of G4 unfolding not established in these studies","Selectivity among many cellular G4 substrates unclear"]},{"year":2022,"claim":"Proposed a dual antiviral mechanism in which CNBP both activates IFNβ transcription upon RNA sensing and directly competes with viral N protein to block phase separation of SARS-CoV-2 RNA.","evidence":"(preprint) CNBP-deficient mice with viral loads, direct RNA binding, LLPS competition, IFNβ transcription assays","pmids":["35547851"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Relative contribution of IFNβ vs LLPS mechanisms not quantified","Phosphorylation trigger for translocation not identified"]},{"year":2023,"claim":"Identified the nuclear import machinery and a phase-separation-based mechanism by which CNBP regulates SWI/SNF activity and ribosome biogenesis.","evidence":"Co-IP/MS identifying KPNB1, ChIP, reporter assays, and cell-penetrating peptide disruption of CNBP condensates in neuroblastoma cells","pmids":["37186134"],"confidence":"Medium","gaps":["Direct CNBP-SMARCC2 interaction interface not mapped","Physiological conditions inducing CNBP condensation unclear","Single-lab condensate model"]},{"year":2024,"claim":"Added TCOF1 as a G-quadruplex-regulated CNBP target, showing high-affinity binding to both folded and unfolded promoter PQS and bidirectional transcriptional modulation.","evidence":"CD, fluorescence binding with Kd, ChIP in HeLa, luciferase reporter, and zebrafish overexpression/knockdown of nolc1","pmids":["38553547"],"confidence":"High","gaps":["Why both overexpression and knockdown raise nolc1 not mechanistically resolved","In vivo G4 folding state at the TCOF1 promoter unknown","Cofactors at this promoter not identified"]},{"year":2025,"claim":"Revealed a cytoskeletal trafficking role, defining CNBP as a kinesin adaptor that links GA-rich 3'UTR mRNAs to KIF1C for microtubule transport supporting cell migration, and refined disease mechanism through pAMPK-dependent control of CNBP stability.","evidence":"Direct CNBP-3'UTR and CNBP-KIF1C binding assays, mRNA localization and KIF1C recruitment loss-of-function; Co-IP of CNBP-pAMPK with AMPK-activator rescue in DM2 fibroblasts and Cnbp KO mouse imaging","pmids":["39982819","39807631"],"confidence":"High","gaps":["AMPK phosphosite on CNBP not mapped","Full repertoire of protrusion-targeted CNBP mRNAs incomplete","How trafficking, translation and transcription roles are partitioned in a cell unresolved"]},{"year":null,"claim":"It remains unresolved how CNBP's multiple, sometimes opposing activities — G4 folding vs unfolding, transcriptional vs translational vs trafficking control — are coordinated and switched within a single cell.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model reconciling G4-promoting (c-myc) and G4-unfolding (KRAS, NOGGIN) activities","No high-resolution structure of CNBP bound to nucleic acid or partner proteins","Signal-specific phosphorylation code governing CNBP localization and function undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,8,9,17,20,26]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,11,12,16,19,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,11,12,16,18,19,25]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[3,5,9,13,21]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[8,19,20,22]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,26]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,16,18,23,24]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10,18]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[9]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,11,12,16,19,25]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[17,20,26]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[16,18]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,6,8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[15]}],"complexes":["CNBP-PCBP2 holo-ITAF (ODC IRES)","CNBP/NM23-H2 c-myc promoter complex","CNBP-KIF1C motor-adaptor complex","CNBP-LAST lncRNA complex"],"partners":["PCBP2","NM23-H2","KIF1C","KPNB1","PABP","AMPK","SMARCC2","RO60"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62633","full_name":"CCHC-type zinc finger nucleic acid binding protein","aliases":["Cellular nucleic acid-binding protein","CNBP","Zinc finger protein 9"],"length_aa":177,"mass_kda":19.5,"function":"Single-stranded DNA-binding protein that preferentially binds to the sterol regulatory element (SRE) sequence 5'-GTGCGGTG-3', and thereby mediates transcriptional repression (PubMed:2562787). Has a role as transactivator of the Myc promoter (By similarity). Binds single-stranded RNA in a sequence-specific manner (By similarity) Binds G-rich elements in target mRNA coding sequences (PubMed:28329689). Prevents G-quadruplex structure formation in vitro, suggesting a role in supporting translation by resolving stable structures on mRNAs (PubMed:28329689) Binds to RNA Binds to RNA Binds to RNA Binds to RNA Binds to RNA","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P62633/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CNBP","classification":"Not 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CNBP","url":"https://www.omim.org/entry/116955"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/18758991","citation_count":5,"is_preprint":false},{"pmid":"34234810","id":"PMC_34234810","title":"A 14-Year Italian Experience in DM2 Genetic Testing: Frequency and Distribution of Normal and Premutated CNBP Alleles.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34234810","citation_count":5,"is_preprint":false},{"pmid":"35547851","id":"PMC_35547851","title":"CNBP restricts SARS-CoV2 by regulating IFN and disrupting RNA-protein condensates.","date":"2022","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/35547851","citation_count":4,"is_preprint":false},{"pmid":"39080743","id":"PMC_39080743","title":"STAU1-mediated CNBP mRNA degradation by LINC00665 alters stem cell characteristics in ovarian cancer.","date":"2024","source":"Biology 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Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39703464","citation_count":2,"is_preprint":false},{"pmid":"38553547","id":"PMC_38553547","title":"The transcription of the main gene associated with Treacher-Collins syndrome (TCOF1) is regulated by G-quadruplexes and cellular nucleic acid binding protein (CNBP).","date":"2024","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/38553547","citation_count":1,"is_preprint":false},{"pmid":"39807631","id":"PMC_39807631","title":"The role of CNBP in brain atrophy and its targeting in myotonic dystrophy type 2.","date":"2025","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39807631","citation_count":0,"is_preprint":false},{"pmid":"38979199","id":"PMC_38979199","title":"A KIF1C-CNBP motor-adaptor complex for trafficking mRNAs to cell protrusions.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38979199","citation_count":0,"is_preprint":false},{"pmid":"41928282","id":"PMC_41928282","title":"Single-cell and spatial profiling of peripheral blood and synovium unveils pro-arthritis CNBP+ myeloid cells.","date":"2026","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/41928282","citation_count":0,"is_preprint":false},{"pmid":"41881984","id":"PMC_41881984","title":"A new candidate tumor suppressor tRF-Ser inhibits gastric cancer progression by regulating the CNBP/HSPA8 axis.","date":"2026","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41881984","citation_count":0,"is_preprint":false},{"pmid":"41943842","id":"PMC_41943842","title":"Dietary targeting of CNBP to rein in the EREG-EGFR cascade and restore homeostasis in colitis-associated colorectal cancer.","date":"2026","source":"International journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41943842","citation_count":0,"is_preprint":false},{"pmid":"41882094","id":"PMC_41882094","title":"Non-telomeric function deficiency of TERT enhances pressure overload-induced mouse cardiac remodeling by activation of CNBP-mediated THBS3/ITGB1 pathway.","date":"2026","source":"Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/41882094","citation_count":0,"is_preprint":false},{"pmid":"41937177","id":"PMC_41937177","title":"The novel (TCTG)n motif in CNBP expanded alleles: composition, dynamics and genotype-phenotype correlation in Myotonic dystrophy type 2 (DM2).","date":"2026","source":"Human genomics","url":"https://pubmed.ncbi.nlm.nih.gov/41937177","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.28.685039","title":"Distinct Cellular Effects of Myotonic Dystrophy type 2 RAN Tetrapeptides in  <i>Drosophila melanogaster</i>","date":"2025-10-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.28.685039","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":35913,"output_tokens":7154,"usd":0.107524,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16301,"output_tokens":7429,"usd":0.133615,"stage2_stop_reason":"end_turn"},"total_usd":0.241139,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Recombinant GST-CNBP fusion protein binds to G-rich single-stranded RNA and DNA in a sequence-specific manner, establishing CNBP as a sequence-specific single-stranded nucleic acid binding protein.\",\n      \"method\": \"In vitro binding assay with recombinant GST-fusion protein\",\n      \"journal\": \"DNA research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro binding assay with recombinant protein, single lab, single method\",\n      \"pmids\": [\"7788528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CNBP binds to the 5'UTR of ribosomal protein mRNAs (specifically a downstream region) as a dimer, with binding mutually exclusive with La protein binding; Ro60 autoantigen is required as an ancillary factor for CNBP binding. CNBP multimerizes and its binding is assisted by a protease-sensitive factor involving Ro60.\",\n      \"method\": \"In vitro binding assays, RNA-protein binding analysis, mutational analysis of 5'UTR\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple binding variants and mutational analysis, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"9710533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CNBP protein localizes to the nucleus of cells and strongly stimulates cell proliferation and increases c-myc promoter activity upon overexpression; CNBP is essential for forebrain induction in mouse embryos, and Myc expression was absent in anterior regions of Cnbp-/- embryos, indicating CNBP targets Myc in rostral head formation.\",\n      \"method\": \"Promoter-trap mutagenesis, transgenic rescue, CAT assay, in vivo mouse knockout\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with defined phenotype, transgenic rescue, reporter assay; replicated across multiple experimental approaches in one study\",\n      \"pmids\": [\"12588852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CNBP and La proteins bind the 5'UTR of ribosomal protein mRNAs and can relieve TOP-mediated translational repression; CNBP binding to TOP hairpin structures activates translation of ribosomal protein mRNAs, and CNBP also increases cap-independent translation from IRES elements in mammalian cells.\",\n      \"method\": \"Tetracycline-regulated expression system, SEAP reporter assay in transgenic CHO cells, confocal microscopy\",\n      \"journal\": \"Biotechnology and bioengineering\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assays in mammalian cells with regulated expression, single lab, two orthogonal methods\",\n      \"pmids\": [\"12432575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CNBP is required for forebrain specification in chick embryos at organogenesis stage; CNBP silencing abolished expression of forebrain transcription factors BF-1, Six3 and Hesx1 (but not Otx2), while CNBP misexpression induced their ectopic expression in the hindbrain, placing CNBP upstream of these rostral head transcription factors in a pathway parallel to Otx2.\",\n      \"method\": \"RNAi silencing and retroviral misexpression in chick embryos, in situ hybridization\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function in vivo with specific molecular readouts, single lab, two orthogonal methods\",\n      \"pmids\": [\"16626683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ZNF9/CNBP and PCBP2 form a holo-ITAF ribonucleoprotein complex that binds the ODC mRNA IRES and stimulates cap-independent translation; ZNF9 specifically associates with wild-type but not mutant IRES sequences.\",\n      \"method\": \"Proteomics screen (mass spectrometry), biochemical validation of RNA-protein interaction, functional translation assays, co-immunoprecipitation of ZNF9 and PCBP2\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (MS, Co-IP, biochemical assays, functional translation assays) in single study; mechanistically rigorous\",\n      \"pmids\": [\"17327219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CNBP mediates neural crest cell expansion by controlling cell proliferation and survival rather than via cell fate switching during rostral head development in zebrafish; morpholino knockdown caused forebrain truncation, reduced proliferation, and increased cell death in anterior regions.\",\n      \"method\": \"Antisense morpholino oligonucleotide knockdown in zebrafish, in situ hybridization, cell proliferation and death assays\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockdown with specific cellular and molecular phenotypic readouts, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17471504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Haploinsufficiency of Znf9 in mice (Znf9+/- mice with significantly decreased Znf9 expression) causes myotonic dystrophy-like phenotype including myotonic discharges, heart conduction abnormalities, and muscle histological changes; Clc1 (skeletal muscle chloride channel 1) expression was dramatically decreased in Znf9+/- mice, and Znf9 transgenic rescue normalized both Znf9, Clc1 and the phenotype.\",\n      \"method\": \"Mouse genetics (heterozygous knockout, transgenic rescue), EMG, ECG, Western blot, loss-of-function with specific molecular readout\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic model with transgenic rescue, specific molecular target (Clc1) identified, multiple orthogonal methods in single study\",\n      \"pmids\": [\"17335846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The RGG box of CNBP is essential for RNA-protein binding and nucleic acid chaperone activity; Zn knuckles are required but not individually essential for CNBP biochemical activities; removal of the RGG box allows weak ssDNA binding but abolishes RNA binding; mutants lacking the N-terminal region or RGG box act as dominant negatives in Xenopus neural crest development.\",\n      \"method\": \"Site-directed mutagenesis, recombinant protein expression/purification in E. coli, in vitro biochemical assays, gain- and loss-of-function in Xenopus embryos\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with in vitro reconstitution and in vivo functional validation; multiple orthogonal approaches in single study\",\n      \"pmids\": [\"18703071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ZNF9/CNBP associates with actively translating ribosomes and directly binds the ODC mRNA IRES sequence to activate cap-independent translation in primary human myoblasts; this activity is reduced in myoblasts from a DM2 patient.\",\n      \"method\": \"Polysome profiling, ribosome isolation, direct RNA binding assays, functional IRES translation assay in primary human myoblasts\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (polysome profiling, direct binding, functional assays) with disease-relevant cell model; rigorous mechanistic demonstration\",\n      \"pmids\": [\"20174632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CNBP associates with the poly(A) binding protein and accumulates in stress granules during arsenite treatment of human cells, implicating CNBP in mRNA handling during stress. The yeast ortholog Gis2 shows RNA-dependent interactions with poly(A) binding protein and eIF4G and localizes to processing bodies and stress granules.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization (fluorescence microscopy), polysome/stress granule fractionation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP and localization with functional implication; ortholog evidence provides context, but human CNBP evidence is partially inferred from yeast ortholog\",\n      \"pmids\": [\"23285195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Human CNBP specifically binds the G-rich sequence of c-myc NHE III1 region and promotes G-quadruplex formation; CNBP induces a transient decrease followed by an increase in c-myc transcription in vivo. The interaction of CNBP with NM23-H2 is responsible for the increase of c-myc transcription, establishing a G-quadruplex-related CNBP/NM23-H2 protein complex at the c-myc promoter.\",\n      \"method\": \"EMSA, CD spectroscopy, FRET, ChIP, RNA interference, luciferase reporter assay, SPR, co-immunoprecipitation, co-transfection\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple highly orthogonal methods (EMSA, FRET, ChIP, Co-IP, SPR, reporter assay) in a single study establishing mechanism\",\n      \"pmids\": [\"23774591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CNBP acts as a transcriptional regulator of tbx2b, smarca5, and wnt5b in developing zebrafish embryos; CNBP up-regulates tbx2b and smarca5 and down-regulates wnt5b. The direct interaction between CNBP and candidate gene promoters was confirmed by EMSA and ChIP. CNBP DNA-binding sites are G-enriched sequences with high frequency of putative G-quadruplex secondary structure.\",\n      \"method\": \"Yeast one-hybrid assay, bioinformatics, EMSA, ChIP, loss-of-function in zebrafish\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with direct binding confirmed by EMSA and ChIP; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"23667590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In Drosophila, CNBP regulates dMyc translation through an IRES-dependent mechanism; knockdown of dCNBP reduces dMyc protein but not mRNA levels; reintroduction of dMyc in CNBP-deficient wing imaginal discs rescues wing size reduction, establishing a CNBP-Myc translational axis controlling wing development.\",\n      \"method\": \"Drosophila genetics (knockdown, rescue experiments), Western blot, RT-PCR, wing size measurement, genetic epistasis\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with specific molecular readout and rescue experiment; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"24275942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Tag-free recombinant CNBP forms homodimers that coexist with monomers; CNBP has a secondary structure dominated by random-coil and β-sheet corresponding to zinc knuckle motifs; CNBP structural stability increases upon binding single-stranded nucleic acid targets; a conserved tryptophan residue is involved directly or indirectly in nucleic acid binding.\",\n      \"method\": \"Size-exclusion HPLC, circular dichroism spectroscopy, fluorescence spectroscopy, recombinant protein purification\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple biophysical methods on purified recombinant protein; single lab, rigorous in vitro characterization\",\n      \"pmids\": [\"24161561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"CNBP modulates transcription of Wnt signaling pathway components (cdk14, ptk7, tcf7l2) in a dose-dependent fashion in developing zebrafish embryos, which in turn affects c-myc, ccnd1 and axin2 expression. CNBP down-regulates Wnt5 transcription.\",\n      \"method\": \"Loss-of-function in zebrafish, RT-PCR, bioinformatics for CNBP binding site identification\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with defined molecular targets and pathway placement; single lab, multiple gene targets examined\",\n      \"pmids\": [\"25151948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CNBP acts as a transcription factor binding specific motifs in the promoter region of sustained inflammatory cytokines (particularly IL-6); LPS induces CNBP expression via NF-κB and autoregulation; LPS-induced phosphorylation-mediated CNBP dimerization is required for its nuclear translocation; cnbp-depleted zebrafish are highly susceptible to Shigella flexneri infection.\",\n      \"method\": \"ChIP, dual-luciferase assay, zebrafish knockdown, nuclear translocation assays, infection model\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating direct DNA binding, functional reporter assays, in vivo knockdown with phenotypic rescue; multiple orthogonal methods across cell and animal models\",\n      \"pmids\": [\"28168305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CNBP cooperates with lncRNA LAST to bind the 5'UTR of CCND1 mRNA and protect it from nuclease degradation, stabilizing CCND1 mRNA. CNBP RIP-seq and LAST RNA-seq identified CCND1 mRNA and three additional mRNA targets as post-transcriptional targets of the CNBP-LAST complex.\",\n      \"method\": \"RIP-seq, RNA-seq, CNBP-LAST binding assay, mRNA stability assays, xenograft model\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq and functional stability assays; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"29199958\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CNBP resides in the cytosol of macrophages and translocates to the nucleus in response to microbial pathogens and pathogen-derived products; nuclear translocation and DNA-binding activity of c-Rel (a driver of IL-12β transcription) requires CNBP; Cnbp-deficient macrophages exhibit impaired c-Rel activation without affecting canonical NF-κB/Rel signaling; Cnbp-deficient mice show reduced IL-12β and impaired Th1 IFN-γ response.\",\n      \"method\": \"Cnbp knockout mice, nuclear translocation assays, c-Rel DNA binding assay, infection model (toxoplasmosis), cytokine measurements\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with specific molecular mechanism (c-Rel pathway), nuclear translocation assay, in vivo infection model; multiple orthogonal methods\",\n      \"pmids\": [\"30442645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CNBP acts in vitro as a G-quadruplex (G4)-unfolding protein over tetramolecular G4 formed by TG4T and over G4s in promoters of oncogenes (KRAS, NOGGIN); CNBP depletion reduces KRAS transcription in cellulo, suggesting CNBP relieves G4-mediated transcriptional silencing; CNBP unfolds the G4 in the NOG promoter and represses NOG transcription in zebrafish, establishing a G4-unfolding mechanism for CNBP transcriptional control.\",\n      \"method\": \"In vitro G4-unfolding assay, CNBP depletion in cells, RT-qPCR, zebrafish in vivo experiments\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro biochemical G4-unfolding reconstitution combined with cell depletion and in vivo zebrafish experiments; multiple orthogonal methods\",\n      \"pmids\": [\"31219592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CNBP binding to lncRNA Braveheart (Bvht) remodels the 3-D structure of Bvht; Bvht has a well-defined but flexible 3-D structure in solution that changes upon CNBP binding; CNBP binding requires multiple domains of Bvht and the RHT/AGIL RNA motif, which contains a highly flexible loop surrounded by ordered helices.\",\n      \"method\": \"Small angle X-ray scattering (SAXS), structural ensemble analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous 3-D structural study using SAXS with functional domain mapping; single lab but high-quality structural method\",\n      \"pmids\": [\"31919376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Drosophila CNBP (dCNBP) controls polyamine metabolism by binding dOdc mRNA and regulating its translation; depletion of dCNBP in muscles reduces ODC protein and polyamine levels, causing age-dependent locomotor defects; locomotor defects are rescued by polyamine supplementation or dOdc1 overexpression. The CNBP-polyamine axis is also reduced in muscles from DM2 patients.\",\n      \"method\": \"Drosophila muscle-specific knockdown, mRNA binding assays, ODC and polyamine measurements, locomotor assays, rescue experiments, analysis of DM2 patient muscle\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockdown with specific molecular target (ODC/polyamine), rescue by supplementation and overexpression, ortholog evidence; validated in patient samples\",\n      \"pmids\": [\"34517941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CNBP binds and promotes unfolding of G-quadruplexes formed by both positive-sense and negative-sense RNA strands of SARS-CoV-2; CNBP is the main human cellular protein bound to SARS-CoV-2 RNA genome.\",\n      \"method\": \"Multiple biophysical techniques (confirmed G4 formation), molecular binding approaches, G4-unfolding assays with purified CNBP\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical G4-unfolding assay with multiple biophysical techniques; single lab, confirms CNBP as main binding protein\",\n      \"pmids\": [\"33807682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CNBP undergoes phosphorylation-induced nuclear translocation in response to RNA sensing pathways; nuclear CNBP binds IFNβ enhancer DNA and activates IFNβ gene transcription during SARS-CoV-2 infection; CNBP also binds SARS-CoV-2 viral RNA directly and competes with the nucleocapsid (N) protein to prevent viral RNA and N protein from undergoing liquid-liquid phase separation (LLPS), limiting viral replication. CNBP-deficient mice have higher viral loads and succumb rapidly to infection.\",\n      \"method\": \"CNBP-deficient mice, viral load measurement, direct RNA binding assay, LLPS competition assay, IFNβ reporter/transcription assay\",\n      \"journal\": \"Research square (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mouse knockout with viral phenotype, direct binding and LLPS assays; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"35547851\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KPNB1 (karyopherin subunit beta 1) is responsible for nuclear transport of CNBP; liquid condensates (phase separation) of CNBP repress SWI/SNF core subunit SMARCC2 activity via direct interaction, leading to increased SMARCC1/SMARCA4 binary complex activity that facilitates 18S rRNA processing; blocking CNBP phase separation with a cell-penetrating peptide inhibits ribosome biogenesis.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ChIP, dual-luciferase reporter assay, cell-penetrating peptide functional assay, gain- and loss-of-function in neuroblastoma cells\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and MS for interaction, functional phase separation assay; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"37186134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CNBP transcriptionally regulates TCOF1 by binding G-quadruplex sequences (PQSs) in its promoter; CNBP binds both G4-folded and unfolded forms of TCOF1 promoter PQS sequences with nM affinity in vitro; ChIP confirms CNBP binding to TCOF1 promoter in HeLa cells; in zebrafish, both cnbp overexpression and knockdown induce nolc1 (TCOF1 ortholog) transcription, suggesting CNBP modulates TCOF1 transcription through G-quadruplex folding/unfolding.\",\n      \"method\": \"Circular dichroism, fluorescence binding assays, ChIP in HeLa cells, luciferase reporter assay, zebrafish morpholino knockdown/overexpression, antisense oligonucleotide G4 disruption\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro biochemical binding with Kd values, ChIP confirmation, functional reporter assay, and in vivo zebrafish validation; multiple orthogonal methods\",\n      \"pmids\": [\"38553547\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CNBP forms a motor-adaptor complex with the KIF1C kinesin; CNBP directly binds GA-rich sequences in the 3'UTR of protrusion-targeted mRNAs; CNBP interacts with KIF1C and is required for KIF1C recruitment to mRNA cargo and active transport of mRNAs on microtubules to peripheral protrusions of mammalian cells; this trafficking is important for cell migration.\",\n      \"method\": \"Direct RNA binding assays (CNBP-3'UTR interaction), protein-protein interaction assays (CNBP-KIF1C), mRNA localization assays, loss-of-function with specific readout (mRNA trafficking, KIF1C recruitment)\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assays for RNA and protein interactions, loss-of-function with specific mechanistic readout (KIF1C recruitment), multiple orthogonal methods in single study\",\n      \"pmids\": [\"39982819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CNBP protein stability is regulated by pAMPK-dependent phosphorylation; CNBP interacts with pAMPK; in DM2 cells active pAMPK is reduced, leading to decreased CNBP stability; treatment with AMPK activator A769662 corrects CNBP stability and normalizes CNBP target expression in DM2 fibroblasts.\",\n      \"method\": \"Co-immunoprecipitation (CNBP-pAMPK), Western blot for pAMPK levels, small molecule AMPK activator treatment in DM2 fibroblasts, Cnbp KO mouse MRI/DTI analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, pharmacological rescue in disease cell model; single lab, two orthogonal approaches\",\n      \"pmids\": [\"39807631\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CNBP (ZNF9) is a conserved multi-zinc-knuckle, RGG-box-containing single-stranded nucleic acid binding protein that functions as both a transcriptional and translational regulator: it unfolds G-quadruplex structures in gene promoters to control transcription (of c-MYC, KRAS, IL-6, IL-12β, TCOF1, and others), acts as a nucleic acid chaperone to remodel RNA secondary structures, activates cap-independent (IRES-mediated) translation of target mRNAs (including ODC and Myc) by associating with actively translating ribosomes, stabilizes mRNAs by binding their 5'UTR in cooperation with partner proteins, forms a motor-adaptor complex with KIF1C kinesin for active microtubule-dependent mRNA transport to cell protrusions, undergoes phosphorylation-induced nuclear translocation (regulated by pAMPK and in response to inflammatory signals), and is required for neural crest expansion, forebrain development, and innate immune responses in multiple vertebrate model systems.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CNBP (ZNF9) is a conserved single-stranded nucleic acid-binding protein that operates as both a transcriptional and post-transcriptional regulator of gene expression, with roles spanning vertebrate head/neural crest development, innate immunity, and intracellular mRNA logistics [#2, #16]. Its biochemical core is a multi-zinc-knuckle, RGG-box architecture: it binds G-rich single-stranded RNA and DNA sequence-specifically [#0], and the RGG box is essential for RNA binding and nucleic acid chaperone activity while removal converts it to a dominant negative in vivo [#8]. At the transcriptional level CNBP recognizes G-quadruplex-forming promoter elements and acts as a G4-unfolding/remodeling factor, controlling transcription of c-MYC (via a CNBP/NM23-H2 complex at NHE III1) [#11], KRAS and NOGGIN [#19], TCOF1 [#25], and developmental genes including tbx2b, smarca5, wnt5b and Wnt-pathway components [#12, #15]. Post-transcriptionally, CNBP activates cap-independent (IRES-mediated) translation by associating with translating ribosomes and forming a holo-ITAF complex with PCBP2 on the ODC mRNA IRES [#5, #9], drives an ODC/polyamine translational axis [#21], stabilizes CCND1 mRNA in cooperation with lncRNA LAST [#17], remodels lncRNA 3-D structure such as Braveheart [#20], and forms a motor-adaptor complex with the KIF1C kinesin to traffic 3'UTR GA-rich mRNAs to cell protrusions for migration [#26]. In innate immunity CNBP is a cytosolic factor that, upon phosphorylation-induced dimerization and nuclear translocation, drives transcription of inflammatory cytokines including IL-6 and supports c-Rel-dependent IL-12\\u03b2 expression [#16, #18]. Its activity is gated by regulated nuclear import via KPNB1 and by pAMPK-dependent phosphorylation that controls CNBP protein stability [#24, #27]. Loss of one Znf9 allele in mice produces a myotonic dystrophy-like phenotype with reduced chloride channel Clc1 expression, and CNBP-dependent IRES/polyamine activity is impaired in DM2 patient cells [#7, #9, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established the fundamental biochemical activity of CNBP: that it is a sequence-specific single-stranded nucleic acid binding protein, defining the molecular basis for all later regulatory roles.\",\n      \"evidence\": \"In vitro binding assay with recombinant GST-CNBP on G-rich ssRNA/ssDNA\",\n      \"pmids\": [\"7788528\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Single in vitro method, no cellular targets identified\", \"Did not distinguish DNA vs RNA functional preference\", \"No structural determinant of specificity defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"First placed CNBP on a specific mRNA element (ribosomal protein 5'UTRs) and showed it acts as a multimer with ancillary factors, hinting at a translational regulatory function.\",\n      \"evidence\": \"In vitro RNA-protein binding and 5'UTR mutational analysis; competition with La and dependence on Ro60\",\n      \"pmids\": [\"9710533\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional translational consequence not demonstrated in this study\", \"Ro60 dependence mechanism unresolved\", \"In vitro only\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connected CNBP to a defined developmental program and a transcriptional target, showing it drives proliferation and Myc expression and is required for forebrain/rostral head formation.\",\n      \"evidence\": \"Mouse Cnbp knockout with transgenic rescue, c-myc promoter CAT/reporter assays, overexpression proliferation assays; plus reporter studies of TOP/IRES translational activation\",\n      \"pmids\": [\"12588852\", \"12432575\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether Myc regulation is transcriptional, translational or both not fully separated\", \"Direct promoter binding not shown in knockout study\", \"Mechanism of TOP/IRES activation not molecularly defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Refined CNBP's developmental role by placing it upstream of specific forebrain transcription factors in a pathway parallel to Otx2.\",\n      \"evidence\": \"RNAi silencing and retroviral misexpression in chick embryos with in situ readouts of BF-1, Six3, Hesx1\",\n      \"pmids\": [\"16626683\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect regulation of these TFs unresolved\", \"No biochemical promoter binding shown\", \"Molecular activity (transcription vs translation) not distinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved how CNBP supports proliferation in vivo and defined a concrete translational mechanism, showing it forms a holo-ITAF with PCBP2 on the ODC IRES and controls neural crest cell number rather than fate.\",\n      \"evidence\": \"Proteomics/Co-IP identifying PCBP2, IRES translation assays; zebrafish morpholino knockdown with proliferation/death readouts\",\n      \"pmids\": [\"17327219\", \"17471504\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Stoichiometry of the CNBP-PCBP2 ITAF complex not defined\", \"Generalizability beyond ODC IRES not established here\", \"Link between IRES activity and proliferation phenotype indirect\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established the disease relevance of CNBP dosage, showing Znf9 haploinsufficiency produces a myotonic dystrophy-like phenotype tied to reduced Clc1 chloride channel expression.\",\n      \"evidence\": \"Znf9+/- mice with EMG/ECG/histology and transgenic rescue, Clc1 Western blot\",\n      \"pmids\": [\"17335846\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism linking CNBP to Clc1 expression not defined\", \"Whether effect is transcriptional or post-transcriptional unclear\", \"Does not address DM2 repeat-expansion sequestration models directly\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the structural determinants of CNBP function, demonstrating the RGG box is essential for RNA binding and chaperone activity and that domain-deletion mutants act as dominant negatives in vivo.\",\n      \"evidence\": \"Site-directed mutagenesis with in vitro biochemical assays and gain/loss-of-function in Xenopus neural crest\",\n      \"pmids\": [\"18703071\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"High-resolution structure of nucleic-acid-bound CNBP absent\", \"Individual zinc-knuckle contributions only partially resolved\", \"Chaperone mechanism not visualized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked the IRES-translation mechanism directly to disease, showing CNBP associates with translating ribosomes and binds the ODC IRES, with reduced activity in DM2 patient myoblasts.\",\n      \"evidence\": \"Polysome profiling, ribosome isolation, direct RNA binding, IRES translation assay in primary human myoblasts\",\n      \"pmids\": [\"20174632\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Cause of reduced activity in DM2 cells (protein level vs sequestration) not pinpointed here\", \"Full set of CNBP-dependent IRES mRNAs not enumerated\", \"Ribosome association mechanism undefined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed CNBP in stress-responsive mRNA handling by showing it associates with poly(A) binding protein and accumulates in stress granules, with conserved behavior of the yeast ortholog Gis2.\",\n      \"evidence\": \"Co-IP, fluorescence localization, and polysome/stress-granule fractionation in human cells plus yeast ortholog analysis\",\n      \"pmids\": [\"23285195\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional consequence of stress-granule localization not established\", \"Human CNBP role partly inferred from yeast Gis2\", \"Direct vs RNA-bridged PABP interaction not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined CNBP's signature transcriptional mechanism — binding G-rich promoter sequences and modulating G-quadruplex structures — and identified protein partners and direct developmental targets.\",\n      \"evidence\": \"EMSA/CD/FRET/ChIP/SPR/Co-IP at the c-myc NHE III1 with NM23-H2; yeast one-hybrid, EMSA, ChIP and zebrafish loss-of-function for tbx2b/smarca5/wnt5b; biophysics of CNBP dimerization and ssNA-induced stabilization; Drosophila IRES-dependent dMyc translation control\",\n      \"pmids\": [\"23774591\", \"23667590\", \"24161561\", \"24275942\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Whether CNBP folds or unfolds G4 at c-myc not fully reconciled across targets\", \"Role of NM23-H2 partnership generality unknown\", \"Coordination of dual transcriptional/translational Myc control unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended CNBP's transcriptional reach into Wnt signaling, showing dose-dependent regulation of Wnt pathway components that feed back onto c-myc/ccnd1/axin2.\",\n      \"evidence\": \"Zebrafish loss-of-function with RT-PCR of cdk14, ptk7, tcf7l2, wnt5\",\n      \"pmids\": [\"25151948\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct promoter binding for all targets not shown\", \"Dose-dependence mechanism unexplained\", \"Downstream phenotypic consequence not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established CNBP as a regulated innate-immune transcription factor and an mRNA-stabilizing factor, showing inducible nuclear translocation driving inflammatory cytokine transcription and lncRNA-assisted CCND1 mRNA stabilization.\",\n      \"evidence\": \"ChIP, dual-luciferase, phosphorylation-dependent nuclear translocation, zebrafish Shigella infection for IL-6 axis; RIP-seq/RNA-seq and stability assays for the CNBP-LAST-CCND1 axis\",\n      \"pmids\": [\"28168305\", \"29199958\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Identity of the kinase driving CNBP dimerization not defined here\", \"Full inflammatory target set incomplete\", \"Mechanism of LAST-CNBP cooperativity at the molecular level unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a specific innate-immune signaling mechanism in macrophages, showing cytosol-to-nucleus translocation of CNBP is required for c-Rel activation and Th1-polarizing IL-12\\u03b2 expression independent of canonical NF-\\u03baB.\",\n      \"evidence\": \"Cnbp knockout mice, nuclear translocation and c-Rel DNA-binding assays, Toxoplasma infection and cytokine measurements\",\n      \"pmids\": [\"30442645\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct vs indirect CNBP-c-Rel interaction not fully defined\", \"Signal/kinase triggering translocation not identified\", \"Relationship to G4/transcriptional mechanism unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the directionality of CNBP's G-quadruplex action, demonstrating it unfolds G4 structures to relieve transcriptional silencing of oncogene promoters.\",\n      \"evidence\": \"In vitro G4-unfolding assays, cellular CNBP depletion with RT-qPCR (KRAS), and zebrafish in vivo NOG repression\",\n      \"pmids\": [\"31219592\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Reconciliation with G4-promoting activity at c-myc not addressed\", \"Genome-wide G4 targets not mapped\", \"Kinetics of unfolding in vivo unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated CNBP's RNA chaperone activity on a functional lncRNA, showing it remodels the 3-D structure of Braveheart via a defined RNA motif.\",\n      \"evidence\": \"SAXS and structural ensemble analysis of Bvht with and without CNBP\",\n      \"pmids\": [\"31919376\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional/cellular consequence of remodeling not tested here\", \"Atomic-resolution structure of complex absent\", \"Which CNBP domains contact the RHT/AGIL motif not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected CNBP's ODC IRES-translation activity to a physiological polyamine axis with disease relevance and extended its G4-unfolding role to a viral RNA genome.\",\n      \"evidence\": \"Drosophila muscle knockdown with dOdc/polyamine measurements, rescue, and DM2 patient muscle analysis; in vitro G4-unfolding of SARS-CoV-2 +/- strand RNA\",\n      \"pmids\": [\"34517941\", \"33807682\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mammalian counterpart of the polyamine axis not directly tested\", \"In vivo antiviral consequence of G4 unfolding not established in these studies\", \"Selectivity among many cellular G4 substrates unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Proposed a dual antiviral mechanism in which CNBP both activates IFN\\u03b2 transcription upon RNA sensing and directly competes with viral N protein to block phase separation of SARS-CoV-2 RNA.\",\n      \"evidence\": \"(preprint) CNBP-deficient mice with viral loads, direct RNA binding, LLPS competition, IFN\\u03b2 transcription assays\",\n      \"pmids\": [\"35547851\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Relative contribution of IFN\\u03b2 vs LLPS mechanisms not quantified\", \"Phosphorylation trigger for translocation not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified the nuclear import machinery and a phase-separation-based mechanism by which CNBP regulates SWI/SNF activity and ribosome biogenesis.\",\n      \"evidence\": \"Co-IP/MS identifying KPNB1, ChIP, reporter assays, and cell-penetrating peptide disruption of CNBP condensates in neuroblastoma cells\",\n      \"pmids\": [\"37186134\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct CNBP-SMARCC2 interaction interface not mapped\", \"Physiological conditions inducing CNBP condensation unclear\", \"Single-lab condensate model\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added TCOF1 as a G-quadruplex-regulated CNBP target, showing high-affinity binding to both folded and unfolded promoter PQS and bidirectional transcriptional modulation.\",\n      \"evidence\": \"CD, fluorescence binding with Kd, ChIP in HeLa, luciferase reporter, and zebrafish overexpression/knockdown of nolc1\",\n      \"pmids\": [\"38553547\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Why both overexpression and knockdown raise nolc1 not mechanistically resolved\", \"In vivo G4 folding state at the TCOF1 promoter unknown\", \"Cofactors at this promoter not identified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed a cytoskeletal trafficking role, defining CNBP as a kinesin adaptor that links GA-rich 3'UTR mRNAs to KIF1C for microtubule transport supporting cell migration, and refined disease mechanism through pAMPK-dependent control of CNBP stability.\",\n      \"evidence\": \"Direct CNBP-3'UTR and CNBP-KIF1C binding assays, mRNA localization and KIF1C recruitment loss-of-function; Co-IP of CNBP-pAMPK with AMPK-activator rescue in DM2 fibroblasts and Cnbp KO mouse imaging\",\n      \"pmids\": [\"39982819\", \"39807631\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"AMPK phosphosite on CNBP not mapped\", \"Full repertoire of protrusion-targeted CNBP mRNAs incomplete\", \"How trafficking, translation and transcription roles are partitioned in a cell unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how CNBP's multiple, sometimes opposing activities — G4 folding vs unfolding, transcriptional vs translational vs trafficking control — are coordinated and switched within a single cell.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No unifying model reconciling G4-promoting (c-myc) and G4-unfolding (KRAS, NOGGIN) activities\", \"No high-resolution structure of CNBP bound to nucleic acid or partner proteins\", \"Signal-specific phosphorylation code governing CNBP localization and function undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 8, 9, 17, 20, 26]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 11, 12, 16, 19, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 11, 12, 16, 18, 19, 25]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [3, 5, 9, 13, 21]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [8, 19, 20, 22]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 16, 18, 23, 24]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10, 18]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 11, 12, 16, 19, 25]},\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [3, 5, 9]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [17, 20, 26]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 18]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 6, 8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [\n      \"CNBP-PCBP2 holo-ITAF (ODC IRES)\",\n      \"CNBP/NM23-H2 c-myc promoter complex\",\n      \"CNBP-KIF1C motor-adaptor complex\",\n      \"CNBP-LAST lncRNA complex\"\n    ],\n    \"partners\": [\"PCBP2\", \"NM23-H2\", \"KIF1C\", \"KPNB1\", \"PABP\", \"AMPK\", \"SMARCC2\", \"Ro60\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}