{"gene":"A1CF","run_date":"2026-06-09T22:02:35","timeline":{"discoveries":[{"year":2001,"finding":"A1CF (ACF/APOBEC1 complementation factor) is an obligate RNA-binding subunit of the core enzyme mediating C-to-U editing of the apolipoprotein B (apoB) mRNA; it binds apoB RNA and apobec-1, and antisense knockout of A1CF expression eliminates apoB RNA editing activity.","method":"Antisense knockdown, reconstituted editing assay, immunodepletion, co-fractionation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution, immunodepletion co-precipitation, antisense knockout with defined editing phenotype, replicated across multiple labs","pmids":["11577082"],"is_preprint":false},{"year":2001,"finding":"The human A1CF gene spans ~80 kb with 15 exons and undergoes complex alternative splicing generating at least nine transcripts, the majority of which encode functional protein; tissue-specific and developmental expression patterns were characterized but the editing activity did not track directly with overall ACF mRNA abundance.","method":"cDNA isolation, RT-PCR, Northern blot, developmental expression panel","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gene characterization with multiple methods in single lab; functional implication drawn from expression data alone","pmids":["11718896"],"is_preprint":false},{"year":2001,"finding":"CUGBP2 co-fractionates with A1CF in bovine liver extracts, co-immunoprecipitates with A1CF in vivo, co-localizes with A1CF in the nucleus, and inhibits C-to-U editing in a dose-dependent manner that is rescued by apobec-1 or A1CF, establishing CUGBP2 as a regulatory component of the apoB mRNA editing holoenzyme.","method":"Co-fractionation, co-immunoprecipitation, immunofluorescence co-localization, reconstituted editing assay, antisense knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, co-localization, and functional reconstitution assay with dose-response and rescue, multiple orthogonal methods","pmids":["11577082"],"is_preprint":false},{"year":2004,"finding":"A1CF acts as an auxiliary factor to APOBEC1 by broadening its temperature range of activity; A1CF promotes a conformational transition in the apoB RNA substrate that occurs spontaneously only at higher temperatures, enabling APOBEC1 to function optimally at physiological temperatures.","method":"Purified recombinant protein assay, steady-state kinetics, temperature-optimum analysis with and without ACF","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous in vitro reconstitution with kinetic analysis but single lab, single study","pmids":["15273326"],"is_preprint":false},{"year":2005,"finding":"Targeted deletion of the murine acf gene results in embryonic lethality at or before the blastocyst stage (E3.5–E4.5), and isolated acf−/− blastocysts fail to proliferate in vitro; siRNA knockdown of A1CF in hepatoma cells (both apobec-1-expressing and apobec-1-deficient) induces apoptosis, demonstrating an apobec-1-independent role of A1CF in cell survival.","method":"Homologous recombination knockout, embryo staging, in vitro blastocyst culture, siRNA knockdown, apoptosis assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined developmental phenotype plus siRNA in two independent cell lines confirming apobec-1-independent function","pmids":["16055734"],"is_preprint":false},{"year":2010,"finding":"A1CF contains three RNA recognition motifs (RRMs) in its N-terminal 320 residues; ACF320 binds preferentially to apoB mRNA and supports APOBEC1-dependent editing at 40% of full-length activity. Live-cell FRET and immunoprecipitation showed A1CF forms RNA-bridged homomultimers in situ, predicting that the C-to-U editosome assembles as a dimer of ACF bound to a dimer of APOBEC1 on the mooring sequence.","method":"Limited proteolysis, truncation mutagenesis, in vitro editing assay, live-cell FRET, immunoprecipitation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (FRET + IP + editing assay + mutagenesis) in single lab","pmids":["20541536"],"is_preprint":false},{"year":2017,"finding":"Conditional A1cf knockout adult mice are viable and fertile with no detectable change in C-to-U RNA editing efficiency at multiple targets including apoB in liver or small intestine, demonstrating that A1CF is dispensable for APOBEC1-mediated RNA editing under normal physiological conditions in adults.","method":"Conditional knockout mouse, RNA editing quantification (multiple targets), blood and urine metabolic analysis","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional genetic knockout with quantified editing at multiple RNA targets, contradicts prior in vitro model","pmids":["28069890"],"is_preprint":false},{"year":2018,"finding":"A1CF and RBM47 each independently contribute to APOBEC1-dependent C-to-U RNA editing in a tissue-specific manner; double knockout of A1cf and Rbm47 in liver virtually eliminates apoB RNA editing and reduces editing of most other targets, while intestinal double knockout further reduces editing below residual levels seen with Rbm47 single knockout alone.","method":"Tissue-specific conditional knockout (single and double), RNA editing quantification at multiple targets, adenoviral APOBEC1 rescue","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double knockout and rescue experiment across two tissues, multiple RNA targets quantified","pmids":["30309881"],"is_preprint":false},{"year":2019,"finding":"When reconstituted in HEK293T cells (lacking endogenous APOBEC1/A1CF/RBM47), A1CF and RBM47 show clear differences in RNA editing activity on APOB and several other target RNAs, demonstrating differential editing selectivity of the two cofactors.","method":"Heterologous reconstitution in HEK293T cells, cell-based fluorescence editing assay (eGFP subcellular localization reporter), RNA editing quantification","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — clean reconstitution system with quantitative fluorescence readout, single lab","pmids":["30844405"],"is_preprint":false},{"year":2019,"finding":"A1CF functions as a regulator of alternative splicing in hepatocytes, generating hepatocyte-specific alternatively spliced isoforms including those for ketohexokinase C and glycerol kinase; hepatic ablation of A1cf markedly reduces these isoforms, leading to improved glucose tolerance and protection from fructose-induced hyperglycemia and hepatic steatosis.","method":"Conditional hepatic A1cf knockout, RNA-seq, RT-PCR isoform quantification, metabolic phenotyping (glucose tolerance, hepatic lipid, body weight)","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with RNA-seq identification of splicing targets and multiple metabolic phenotypic readouts, orthogonal methods","pmids":["31597092"],"is_preprint":false},{"year":2016,"finding":"A1CF inhibits epithelial-mesenchymal transition (EMT) in rat kidney proximal tubular epithelial cells (NRK52e): ectopic A1CF expression upregulates E-cadherin and downregulates vimentin and α-SMA, while A1CF knockdown enhances EMT markers.","method":"Overexpression and siRNA knockdown, Western blot for EMT markers (E-cadherin, vimentin, α-SMA)","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain- and loss-of-function with protein marker readout in single lab, no mechanistic pathway placement beyond marker changes","pmids":["26848653"],"is_preprint":false},{"year":2019,"finding":"A1CF stabilizes and increases the expression of lncRNA FAM224A in glioma cells; A1CF knockdown suppresses cell proliferation, migration, and invasion and promotes apoptosis by upregulating miR-590-3p through a FAM224A-dependent mechanism.","method":"siRNA knockdown, RIP assay, luciferase reporter, proliferation/migration/invasion assays, xenograft tumor assay","journal":"Journal of experimental & clinical cancer research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, mechanism is primarily through a non-coding RNA axis with limited direct mechanistic dissection of A1CF protein function","pmids":["31186064"],"is_preprint":false},{"year":2019,"finding":"A1CF overexpression increases ERK activation and DKK1 expression in renal cell carcinoma cells, promoting proliferation and colony formation; DKK1 knockdown or MEK inhibition (U0126) suppresses the proliferative effects of A1CF, placing A1CF upstream in an A1CF–DKK1–MEK/ERK axis.","method":"Overexpression, siRNA knockdown, pharmacological MEK inhibition, proliferation and colony formation assays, Western blot for ERK/MEK phosphorylation","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, epistasis defined by KD and inhibitor experiments without mechanistic explanation of how A1CF activates DKK1","pmids":["31881249"],"is_preprint":false},{"year":2019,"finding":"A1CF positively regulates Axin2 expression at mRNA and protein levels; A1CF overexpression reduces apoptosis and promotes migration in Wilms tumor-derived G401 cells through an Axin2-dependent mechanism that suppresses Wnt/β-catenin signaling.","method":"Overexpression and knockdown, qRT-PCR, Western blot (Axin2, β-catenin, CCND1, NKD1), flow cytometry apoptosis, wound-healing migration, Wnt agonist treatment","journal":"In vitro cellular & developmental biology. Animal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, mechanism inferred from marker changes without direct biochemical demonstration of A1CF-Axin2 interaction","pmids":["30825095"],"is_preprint":false},{"year":2020,"finding":"Wild-type A1CF interacts with three functional protein groups by co-immunoprecipitation mass spectrometry: RNA/mRNA processing, cytosolic translation, and mitochondrial translation. A missense variant (G398S) diminishes these interactions, especially with mitochondrial translation proteins, while gaining interactions with cytoskeleton and vesicle-mediated transport machinery, consistent with increased VLDL secretion in carriers.","method":"Co-immunoprecipitation proteomics (interactomics), metabolomics, RNA-seq, oxygen consumption assay","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS interactomics with metabolomics and RNA-seq validation in single lab; functional consequences of interactions not fully reconstituted","pmids":["32786677"],"is_preprint":false},{"year":2024,"finding":"A1CF interacts with NKRF through the RRM1 domain of A1CF and the p65-binding motif of NKRF, in a manner independent of RNA or DNA; this interaction competitively reduces p65 (Ser536) phosphorylation and IFN-β expression, and promotes proliferation in renal carcinoma cells. Deletion of RRM1 abrogates both NKRF binding and the downstream effects.","method":"Co-immunoprecipitation, truncation and deletion mutagenesis, immunofluorescence, Western blot, MTT/EdU proliferation assay, xenograft mouse model","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-mapping mutagenesis with Co-IP, functional assays in cells and in vivo xenograft, single lab","pmids":["38612387"],"is_preprint":false},{"year":2025,"finding":"HNF1A directly controls transcription of A1CF in pancreatic β cells, and A1CF in turn orchestrates an RNA splicing program encompassing genes that regulate β cell function; this HNF1A–A1CF transcription-splicing axis is suppressed in β cells from T2D individuals, and genetic variants reducing pancreatic islet A1CF expression are associated with increased glycemia and T2D susceptibility.","method":"ChIP-seq (HNF1A genomic targets), conditional knockout, RNA-seq (splicing analysis), human islet genetic association, functional β cell assays","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct genomic target identification by ChIP-seq, conditional KO with RNA-seq splicing analysis, validated in human T2D islets with genetic association","pmids":["40774250"],"is_preprint":false},{"year":2016,"finding":"A1CF modulates risk for testicular germ cell tumors (TGCTs) and testicular abnormalities in mice via parent-of-origin effects; partial loss of A1CF produces non-Mendelian inheritance in intercrosses consistent with non-random union of gametes, implicating A1CF in germ-cell fate and gamete function.","method":"Genetic intercross and backcross analysis, Mendelian segregation statistics, testicular tumor scoring","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic/phenotypic analysis in mice; mechanism proposed but not experimentally dissected at molecular level","pmids":["27582469"],"is_preprint":false},{"year":2022,"finding":"A1CF transcripts and their candidate mRNA targets are restricted to the spermatids in which they originate, and in vitro fertilization with A1cf mutant and wild-type alleles shows strong fertilization bias in favor of mutant heterozygotes, suggesting A1CF-dependent mRNA sequestration in spermatids influences gamete function.","method":"In vitro fertilization, Mendelian segregation analysis, transcriptome analysis of spermatid localization","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — IVF genetic analysis with mechanistic hypothesis from transcriptome localization data; no direct biochemical demonstration","pmids":["35948620"],"is_preprint":false}],"current_model":"A1CF (APOBEC1 complementation factor) is an hnRNP-family RNA-binding protein that (1) serves as an auxiliary RNA-binding subunit that binds apoB mRNA and APOBEC1 to facilitate C-to-U RNA editing, though in vivo its role is redundant with RBM47 in a tissue-specific manner; (2) acts as a regulator of alternative pre-mRNA splicing in hepatocytes and pancreatic β cells—controlling isoforms of metabolic enzymes (e.g., ketohexokinase C, glycerol kinase) and a broad β cell splicing program downstream of the transcription factor HNF1A; (3) forms RNA-bridged homomultimers via its RRM domains and interacts with NKRF to modulate NF-κB signaling; and (4) is essential for early embryonic survival through an apobec-1-independent mechanism, while in adult tissues it additionally regulates EMT in kidney tubular cells and cell proliferation in cancer contexts through DKK1-MEK/ERK and Wnt/Axin2/β-catenin signaling axes."},"narrative":{"mechanistic_narrative":"A1CF (APOBEC1 complementation factor) is an hnRNP-type RNA-binding protein originally defined as an obligate auxiliary subunit of the C-to-U RNA editing holoenzyme that acts on apolipoprotein B (apoB) mRNA: it binds both the apoB transcript and the deaminase APOBEC1, and its depletion abolishes editing activity [PMID:11577082]. Mechanistically, A1CF uses three N-terminal RNA recognition motifs to bind apoB mRNA and promotes the substrate conformational transition that allows APOBEC1 to deaminate at physiological temperature, assembling as RNA-bridged homomultimers within the editosome [PMID:15273326, PMID:20541536]. This editing role is conditional in vivo: A1CF is dispensable for normal adult editing [PMID:28069890] and functions redundantly with the paralogous cofactor RBM47 in a tissue-specific manner, with the two cofactors showing distinct target selectivity such that loss of both virtually eliminates hepatic apoB editing [PMID:30309881, PMID:30844405]. Beyond editing, A1CF is a regulator of alternative pre-mRNA splicing: hepatic ablation reduces metabolic-enzyme isoforms such as ketohexokinase C and glycerol kinase and protects against fructose-induced hyperglycemia and steatosis [PMID:31597092], and in pancreatic β cells A1CF is a direct transcriptional target of HNF1A that orchestrates a β-cell splicing program disrupted in type 2 diabetes [PMID:40774250]. A1CF is also essential for early embryonic survival through an APOBEC1-independent function, with its loss causing pre-blastocyst lethality and apoptosis in cultured cells [PMID:16055734]. It additionally engages NKRF through its RRM1 domain to dampen p65 phosphorylation and IFN-β expression [PMID:38612387] and influences epithelial-mesenchymal transition and proliferation in renal and tumor cells [PMID:26848653].","teleology":[{"year":2001,"claim":"Established the founding function of A1CF as the RNA-binding subunit required for apoB mRNA C-to-U editing, defining how a deaminase achieves site-specific RNA editing.","evidence":"Reconstituted editing assay, immunodepletion, co-fractionation and antisense knockdown of A1CF binding apoB RNA and APOBEC1","pmids":["11577082"],"confidence":"High","gaps":["Did not define the structural basis of substrate recognition","In vivo necessity not yet tested genetically"]},{"year":2001,"claim":"Identified CUGBP2 as a regulatory component of the editing holoenzyme, showing the editosome is a multi-protein assembly whose activity can be modulated by accessory factors.","evidence":"Co-fractionation, reciprocal co-IP, nuclear co-localization, and dose-dependent inhibition of editing rescued by APOBEC1 or A1CF","pmids":["11577082"],"confidence":"High","gaps":["Physiological context of CUGBP2 inhibition unclear","Whether CUGBP2 competes with A1CF for RNA or protein binding not resolved"]},{"year":2001,"claim":"Mapped the A1CF gene architecture and complex alternative splicing, raising the question of whether editing tracks with transcript abundance.","evidence":"cDNA isolation, RT-PCR, Northern blot, developmental expression panel of the ~80 kb 15-exon gene","pmids":["11718896"],"confidence":"Medium","gaps":["Functional roles of the distinct transcripts not assigned","Reason editing does not track with mRNA abundance not explained"]},{"year":2004,"claim":"Defined the biochemical mechanism by which A1CF enhances editing, showing it lowers the temperature requirement for a substrate conformational transition.","evidence":"Purified recombinant protein steady-state kinetics and temperature-optimum analysis with and without ACF","pmids":["15273326"],"confidence":"Medium","gaps":["Single in vitro study, single lab","Structural detail of the RNA conformational transition not resolved"]},{"year":2005,"claim":"Revealed an APOBEC1-independent essential role for A1CF in cell survival and early development, decoupling its editing function from its viability function.","evidence":"Homologous-recombination knockout with blastocyst-stage lethality plus siRNA-induced apoptosis in APOBEC1-expressing and -deficient hepatoma cells","pmids":["16055734"],"confidence":"High","gaps":["Molecular pathway underlying survival function not identified","Targets responsible for embryonic lethality unknown"]},{"year":2010,"claim":"Resolved the domain organization and oligomeric architecture of A1CF in the editosome, proposing a dimer-of-ACF / dimer-of-APOBEC1 assembly on the mooring sequence.","evidence":"Limited proteolysis, truncation mutagenesis, in vitro editing, live-cell FRET, and immunoprecipitation showing RNA-bridged homomultimers via three RRMs","pmids":["20541536"],"confidence":"Medium","gaps":["Stoichiometry inferred, not solved structurally","Functional necessity of multimerization in vivo untested"]},{"year":2017,"claim":"Overturned the obligate-editing-factor model by showing A1CF is dispensable for adult C-to-U editing under normal physiology.","evidence":"Conditional knockout mouse with quantified editing at multiple targets including apoB in liver and intestine","pmids":["28069890"],"confidence":"High","gaps":["Did not identify the compensating factor","Reconciliation with essential embryonic role not addressed"]},{"year":2018,"claim":"Resolved the redundancy by identifying RBM47 as a tissue-specific alternative cofactor that compensates for A1CF in vivo.","evidence":"Single and double tissue-specific conditional knockouts with editing quantification and adenoviral APOBEC1 rescue","pmids":["30309881"],"confidence":"High","gaps":["Determinants of tissue-specific cofactor choice unclear","Whether A1CF and RBM47 co-occupy the same editosomes not established"]},{"year":2019,"claim":"Demonstrated that A1CF and RBM47 are not interchangeable, showing differential target selectivity in a clean heterologous system.","evidence":"Reconstitution in HEK293T cells lacking endogenous factors with a fluorescence-based editing reporter across multiple targets","pmids":["30844405"],"confidence":"Medium","gaps":["Sequence/structural basis of differential selectivity not defined","Single lab, heterologous context"]},{"year":2019,"claim":"Expanded A1CF function beyond editing to alternative splicing control of hepatic metabolic enzymes, linking it to systemic glucose and lipid handling.","evidence":"Conditional hepatic knockout with RNA-seq, isoform RT-PCR, and metabolic phenotyping","pmids":["31597092"],"confidence":"High","gaps":["Direct RNA-binding map at spliced targets not defined","Splicing machinery partners not identified"]},{"year":2020,"claim":"Defined the A1CF protein interactome and showed a disease-associated variant rewires its partners, connecting interaction changes to altered VLDL secretion.","evidence":"Co-IP mass spectrometry of wild-type versus G398S A1CF with metabolomics, RNA-seq, and oxygen consumption assays","pmids":["32786677"],"confidence":"Medium","gaps":["Functional consequences of individual interactions not reconstituted","Mechanism linking mitochondrial-translation partner loss to VLDL secretion unclear"]},{"year":2024,"claim":"Established an RNA-independent protein-protein function for A1CF in modulating NF-κB signaling via direct NKRF binding through RRM1.","evidence":"Co-IP, domain-mapping mutagenesis, immunofluorescence, proliferation assays, and xenograft model in renal carcinoma cells","pmids":["38612387"],"confidence":"Medium","gaps":["Single lab; structural detail of RRM1-NKRF interface not resolved","Generality across cell types untested"]},{"year":2025,"claim":"Placed A1CF within a transcription-to-splicing regulatory axis in pancreatic β cells downstream of HNF1A, linking it to type 2 diabetes pathophysiology.","evidence":"HNF1A ChIP-seq, conditional knockout with RNA-seq splicing analysis, human islet genetic association, and β-cell functional assays","pmids":["40774250"],"confidence":"High","gaps":["Direct A1CF binding to the regulated β-cell transcripts not mapped","Causal splicing targets driving β-cell dysfunction not pinpointed"]},{"year":null,"claim":"How A1CF's distinct activities — RNA editing, alternative splicing, embryonic survival, NF-κB modulation, and germ-cell/gamete effects — are integrated and selected in different tissues remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying mechanism connecting editing, splicing, and survival functions","Structural basis of target and partner selection across contexts not defined","Cancer and germ-cell phenotypes rest on low-confidence, single-lab evidence"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,3,5]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,7]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,9,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,9,16]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[9,16]}],"complexes":["apoB mRNA C-to-U editosome (editing holoenzyme)"],"partners":["APOBEC1","RBM47","CUGBP2","NKRF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NQ94","full_name":"APOBEC1 complementation factor","aliases":["APOBEC1-stimulating protein"],"length_aa":594,"mass_kda":65.2,"function":"Essential component of the apolipoprotein B mRNA editing enzyme complex which is responsible for the postranscriptional editing of a CAA codon for Gln to a UAA codon for stop in APOB mRNA. Binds to APOB mRNA and is probably responsible for docking the catalytic subunit, APOBEC1, to the mRNA to allow it to deaminate its target cytosine. The complex also protects the edited APOB mRNA from nonsense-mediated decay","subcellular_location":"Nucleus; Endoplasmic reticulum; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9NQ94/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/A1CF","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/A1CF","total_profiled":1310},"omim":[{"mim_id":"618199","title":"APOBEC1 COMPLEMENTATION FACTOR; A1CF","url":"https://www.omim.org/entry/618199"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"liver","ntpm":143.1}],"url":"https://www.proteinatlas.org/search/A1CF"},"hgnc":{"alias_symbol":["ACF","ASP","ACF64","ACF65","APOBEC1CF"],"prev_symbol":[]},"alphafold":{"accession":"Q9NQ94","domains":[{"cath_id":"3.30.70.330","chopping":"16-130","consensus_level":"high","plddt":90.915,"start":16,"end":130},{"cath_id":"3.30.70.330","chopping":"136-214","consensus_level":"high","plddt":90.5561,"start":136,"end":214},{"cath_id":"3.30.70.330","chopping":"226-306","consensus_level":"high","plddt":91.4122,"start":226,"end":306},{"cath_id":"3.30.160.20","chopping":"446-521","consensus_level":"high","plddt":84.8357,"start":446,"end":521}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQ94","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQ94-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQ94-F1-predicted_aligned_error_v6.png","plddt_mean":68.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=A1CF","jax_strain_url":"https://www.jax.org/strain/search?query=A1CF"},"sequence":{"accession":"Q9NQ94","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NQ94.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NQ94/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQ94"}},"corpus_meta":[{"pmid":"9230310","id":"PMC_9230310","title":"ACF, an ISWI-containing and ATP-utilizing chromatin assembly and remodeling factor.","date":"1997","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/9230310","citation_count":528,"is_preprint":false},{"pmid":"10385622","id":"PMC_10385622","title":"ACF consists of two subunits, Acf1 and ISWI, that function cooperatively in the ATP-dependent catalysis of chromatin assembly.","date":"1999","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/10385622","citation_count":277,"is_preprint":false},{"pmid":"15643425","id":"PMC_15643425","title":"Distinct activities of CHD1 and ACF in ATP-dependent chromatin assembly.","date":"2005","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15643425","citation_count":233,"is_preprint":false},{"pmid":"12486007","id":"PMC_12486007","title":"The DNA chaperone HMGB1 facilitates ACF/CHRAC-dependent nucleosome sliding.","date":"2002","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/12486007","citation_count":208,"is_preprint":false},{"pmid":"17099699","id":"PMC_17099699","title":"The chromatin-remodeling enzyme ACF is an ATP-dependent DNA length sensor that regulates nucleosome spacing.","date":"2006","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17099699","citation_count":175,"is_preprint":false},{"pmid":"20033040","id":"PMC_20033040","title":"Dynamics of nucleosome remodelling by individual ACF complexes.","date":"2009","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/20033040","citation_count":161,"is_preprint":false},{"pmid":"14752009","id":"PMC_14752009","title":"Acf1 confers unique activities to ACF/CHRAC and promotes the formation rather than disruption of chromatin in vivo.","date":"2004","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/14752009","citation_count":146,"is_preprint":false},{"pmid":"20033039","id":"PMC_20033039","title":"The 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Study","date":"2025-07-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.17.25331691","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.11.17.25340405","title":"Impact assessment of social behavioral change activities on infant and young child feeding (IYCF) of the nutrition program in the host community","date":"2025-11-19","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.17.25340405","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45728,"output_tokens":4649,"usd":0.103459,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12951,"output_tokens":4068,"usd":0.083227,"stage2_stop_reason":"end_turn"},"total_usd":0.186686,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"A1CF (ACF/APOBEC1 complementation factor) is an obligate RNA-binding subunit of the core enzyme mediating C-to-U editing of the apolipoprotein B (apoB) mRNA; it binds apoB RNA and apobec-1, and antisense knockout of A1CF expression eliminates apoB RNA editing activity.\",\n      \"method\": \"Antisense knockdown, reconstituted editing assay, immunodepletion, co-fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution, immunodepletion co-precipitation, antisense knockout with defined editing phenotype, replicated across multiple labs\",\n      \"pmids\": [\"11577082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The human A1CF gene spans ~80 kb with 15 exons and undergoes complex alternative splicing generating at least nine transcripts, the majority of which encode functional protein; tissue-specific and developmental expression patterns were characterized but the editing activity did not track directly with overall ACF mRNA abundance.\",\n      \"method\": \"cDNA isolation, RT-PCR, Northern blot, developmental expression panel\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gene characterization with multiple methods in single lab; functional implication drawn from expression data alone\",\n      \"pmids\": [\"11718896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CUGBP2 co-fractionates with A1CF in bovine liver extracts, co-immunoprecipitates with A1CF in vivo, co-localizes with A1CF in the nucleus, and inhibits C-to-U editing in a dose-dependent manner that is rescued by apobec-1 or A1CF, establishing CUGBP2 as a regulatory component of the apoB mRNA editing holoenzyme.\",\n      \"method\": \"Co-fractionation, co-immunoprecipitation, immunofluorescence co-localization, reconstituted editing assay, antisense knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, co-localization, and functional reconstitution assay with dose-response and rescue, multiple orthogonal methods\",\n      \"pmids\": [\"11577082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A1CF acts as an auxiliary factor to APOBEC1 by broadening its temperature range of activity; A1CF promotes a conformational transition in the apoB RNA substrate that occurs spontaneously only at higher temperatures, enabling APOBEC1 to function optimally at physiological temperatures.\",\n      \"method\": \"Purified recombinant protein assay, steady-state kinetics, temperature-optimum analysis with and without ACF\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous in vitro reconstitution with kinetic analysis but single lab, single study\",\n      \"pmids\": [\"15273326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Targeted deletion of the murine acf gene results in embryonic lethality at or before the blastocyst stage (E3.5–E4.5), and isolated acf−/− blastocysts fail to proliferate in vitro; siRNA knockdown of A1CF in hepatoma cells (both apobec-1-expressing and apobec-1-deficient) induces apoptosis, demonstrating an apobec-1-independent role of A1CF in cell survival.\",\n      \"method\": \"Homologous recombination knockout, embryo staging, in vitro blastocyst culture, siRNA knockdown, apoptosis assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined developmental phenotype plus siRNA in two independent cell lines confirming apobec-1-independent function\",\n      \"pmids\": [\"16055734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A1CF contains three RNA recognition motifs (RRMs) in its N-terminal 320 residues; ACF320 binds preferentially to apoB mRNA and supports APOBEC1-dependent editing at 40% of full-length activity. Live-cell FRET and immunoprecipitation showed A1CF forms RNA-bridged homomultimers in situ, predicting that the C-to-U editosome assembles as a dimer of ACF bound to a dimer of APOBEC1 on the mooring sequence.\",\n      \"method\": \"Limited proteolysis, truncation mutagenesis, in vitro editing assay, live-cell FRET, immunoprecipitation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (FRET + IP + editing assay + mutagenesis) in single lab\",\n      \"pmids\": [\"20541536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conditional A1cf knockout adult mice are viable and fertile with no detectable change in C-to-U RNA editing efficiency at multiple targets including apoB in liver or small intestine, demonstrating that A1CF is dispensable for APOBEC1-mediated RNA editing under normal physiological conditions in adults.\",\n      \"method\": \"Conditional knockout mouse, RNA editing quantification (multiple targets), blood and urine metabolic analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional genetic knockout with quantified editing at multiple RNA targets, contradicts prior in vitro model\",\n      \"pmids\": [\"28069890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A1CF and RBM47 each independently contribute to APOBEC1-dependent C-to-U RNA editing in a tissue-specific manner; double knockout of A1cf and Rbm47 in liver virtually eliminates apoB RNA editing and reduces editing of most other targets, while intestinal double knockout further reduces editing below residual levels seen with Rbm47 single knockout alone.\",\n      \"method\": \"Tissue-specific conditional knockout (single and double), RNA editing quantification at multiple targets, adenoviral APOBEC1 rescue\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double knockout and rescue experiment across two tissues, multiple RNA targets quantified\",\n      \"pmids\": [\"30309881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"When reconstituted in HEK293T cells (lacking endogenous APOBEC1/A1CF/RBM47), A1CF and RBM47 show clear differences in RNA editing activity on APOB and several other target RNAs, demonstrating differential editing selectivity of the two cofactors.\",\n      \"method\": \"Heterologous reconstitution in HEK293T cells, cell-based fluorescence editing assay (eGFP subcellular localization reporter), RNA editing quantification\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — clean reconstitution system with quantitative fluorescence readout, single lab\",\n      \"pmids\": [\"30844405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A1CF functions as a regulator of alternative splicing in hepatocytes, generating hepatocyte-specific alternatively spliced isoforms including those for ketohexokinase C and glycerol kinase; hepatic ablation of A1cf markedly reduces these isoforms, leading to improved glucose tolerance and protection from fructose-induced hyperglycemia and hepatic steatosis.\",\n      \"method\": \"Conditional hepatic A1cf knockout, RNA-seq, RT-PCR isoform quantification, metabolic phenotyping (glucose tolerance, hepatic lipid, body weight)\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with RNA-seq identification of splicing targets and multiple metabolic phenotypic readouts, orthogonal methods\",\n      \"pmids\": [\"31597092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A1CF inhibits epithelial-mesenchymal transition (EMT) in rat kidney proximal tubular epithelial cells (NRK52e): ectopic A1CF expression upregulates E-cadherin and downregulates vimentin and α-SMA, while A1CF knockdown enhances EMT markers.\",\n      \"method\": \"Overexpression and siRNA knockdown, Western blot for EMT markers (E-cadherin, vimentin, α-SMA)\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain- and loss-of-function with protein marker readout in single lab, no mechanistic pathway placement beyond marker changes\",\n      \"pmids\": [\"26848653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A1CF stabilizes and increases the expression of lncRNA FAM224A in glioma cells; A1CF knockdown suppresses cell proliferation, migration, and invasion and promotes apoptosis by upregulating miR-590-3p through a FAM224A-dependent mechanism.\",\n      \"method\": \"siRNA knockdown, RIP assay, luciferase reporter, proliferation/migration/invasion assays, xenograft tumor assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, mechanism is primarily through a non-coding RNA axis with limited direct mechanistic dissection of A1CF protein function\",\n      \"pmids\": [\"31186064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A1CF overexpression increases ERK activation and DKK1 expression in renal cell carcinoma cells, promoting proliferation and colony formation; DKK1 knockdown or MEK inhibition (U0126) suppresses the proliferative effects of A1CF, placing A1CF upstream in an A1CF–DKK1–MEK/ERK axis.\",\n      \"method\": \"Overexpression, siRNA knockdown, pharmacological MEK inhibition, proliferation and colony formation assays, Western blot for ERK/MEK phosphorylation\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, epistasis defined by KD and inhibitor experiments without mechanistic explanation of how A1CF activates DKK1\",\n      \"pmids\": [\"31881249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A1CF positively regulates Axin2 expression at mRNA and protein levels; A1CF overexpression reduces apoptosis and promotes migration in Wilms tumor-derived G401 cells through an Axin2-dependent mechanism that suppresses Wnt/β-catenin signaling.\",\n      \"method\": \"Overexpression and knockdown, qRT-PCR, Western blot (Axin2, β-catenin, CCND1, NKD1), flow cytometry apoptosis, wound-healing migration, Wnt agonist treatment\",\n      \"journal\": \"In vitro cellular & developmental biology. Animal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, mechanism inferred from marker changes without direct biochemical demonstration of A1CF-Axin2 interaction\",\n      \"pmids\": [\"30825095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Wild-type A1CF interacts with three functional protein groups by co-immunoprecipitation mass spectrometry: RNA/mRNA processing, cytosolic translation, and mitochondrial translation. A missense variant (G398S) diminishes these interactions, especially with mitochondrial translation proteins, while gaining interactions with cytoskeleton and vesicle-mediated transport machinery, consistent with increased VLDL secretion in carriers.\",\n      \"method\": \"Co-immunoprecipitation proteomics (interactomics), metabolomics, RNA-seq, oxygen consumption assay\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS interactomics with metabolomics and RNA-seq validation in single lab; functional consequences of interactions not fully reconstituted\",\n      \"pmids\": [\"32786677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A1CF interacts with NKRF through the RRM1 domain of A1CF and the p65-binding motif of NKRF, in a manner independent of RNA or DNA; this interaction competitively reduces p65 (Ser536) phosphorylation and IFN-β expression, and promotes proliferation in renal carcinoma cells. Deletion of RRM1 abrogates both NKRF binding and the downstream effects.\",\n      \"method\": \"Co-immunoprecipitation, truncation and deletion mutagenesis, immunofluorescence, Western blot, MTT/EdU proliferation assay, xenograft mouse model\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-mapping mutagenesis with Co-IP, functional assays in cells and in vivo xenograft, single lab\",\n      \"pmids\": [\"38612387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HNF1A directly controls transcription of A1CF in pancreatic β cells, and A1CF in turn orchestrates an RNA splicing program encompassing genes that regulate β cell function; this HNF1A–A1CF transcription-splicing axis is suppressed in β cells from T2D individuals, and genetic variants reducing pancreatic islet A1CF expression are associated with increased glycemia and T2D susceptibility.\",\n      \"method\": \"ChIP-seq (HNF1A genomic targets), conditional knockout, RNA-seq (splicing analysis), human islet genetic association, functional β cell assays\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct genomic target identification by ChIP-seq, conditional KO with RNA-seq splicing analysis, validated in human T2D islets with genetic association\",\n      \"pmids\": [\"40774250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A1CF modulates risk for testicular germ cell tumors (TGCTs) and testicular abnormalities in mice via parent-of-origin effects; partial loss of A1CF produces non-Mendelian inheritance in intercrosses consistent with non-random union of gametes, implicating A1CF in germ-cell fate and gamete function.\",\n      \"method\": \"Genetic intercross and backcross analysis, Mendelian segregation statistics, testicular tumor scoring\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic/phenotypic analysis in mice; mechanism proposed but not experimentally dissected at molecular level\",\n      \"pmids\": [\"27582469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A1CF transcripts and their candidate mRNA targets are restricted to the spermatids in which they originate, and in vitro fertilization with A1cf mutant and wild-type alleles shows strong fertilization bias in favor of mutant heterozygotes, suggesting A1CF-dependent mRNA sequestration in spermatids influences gamete function.\",\n      \"method\": \"In vitro fertilization, Mendelian segregation analysis, transcriptome analysis of spermatid localization\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — IVF genetic analysis with mechanistic hypothesis from transcriptome localization data; no direct biochemical demonstration\",\n      \"pmids\": [\"35948620\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"A1CF (APOBEC1 complementation factor) is an hnRNP-family RNA-binding protein that (1) serves as an auxiliary RNA-binding subunit that binds apoB mRNA and APOBEC1 to facilitate C-to-U RNA editing, though in vivo its role is redundant with RBM47 in a tissue-specific manner; (2) acts as a regulator of alternative pre-mRNA splicing in hepatocytes and pancreatic β cells—controlling isoforms of metabolic enzymes (e.g., ketohexokinase C, glycerol kinase) and a broad β cell splicing program downstream of the transcription factor HNF1A; (3) forms RNA-bridged homomultimers via its RRM domains and interacts with NKRF to modulate NF-κB signaling; and (4) is essential for early embryonic survival through an apobec-1-independent mechanism, while in adult tissues it additionally regulates EMT in kidney tubular cells and cell proliferation in cancer contexts through DKK1-MEK/ERK and Wnt/Axin2/β-catenin signaling axes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"A1CF (APOBEC1 complementation factor) is an hnRNP-type RNA-binding protein originally defined as an obligate auxiliary subunit of the C-to-U RNA editing holoenzyme that acts on apolipoprotein B (apoB) mRNA: it binds both the apoB transcript and the deaminase APOBEC1, and its depletion abolishes editing activity [#0]. Mechanistically, A1CF uses three N-terminal RNA recognition motifs to bind apoB mRNA and promotes the substrate conformational transition that allows APOBEC1 to deaminate at physiological temperature, assembling as RNA-bridged homomultimers within the editosome [#3, #5]. This editing role is conditional in vivo: A1CF is dispensable for normal adult editing [#6] and functions redundantly with the paralogous cofactor RBM47 in a tissue-specific manner, with the two cofactors showing distinct target selectivity such that loss of both virtually eliminates hepatic apoB editing [#7, #8]. Beyond editing, A1CF is a regulator of alternative pre-mRNA splicing: hepatic ablation reduces metabolic-enzyme isoforms such as ketohexokinase C and glycerol kinase and protects against fructose-induced hyperglycemia and steatosis [#9], and in pancreatic \\u03b2 cells A1CF is a direct transcriptional target of HNF1A that orchestrates a \\u03b2-cell splicing program disrupted in type 2 diabetes [#16]. A1CF is also essential for early embryonic survival through an APOBEC1-independent function, with its loss causing pre-blastocyst lethality and apoptosis in cultured cells [#4]. It additionally engages NKRF through its RRM1 domain to dampen p65 phosphorylation and IFN-\\u03b2 expression [#15] and influences epithelial-mesenchymal transition and proliferation in renal and tumor cells [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the founding function of A1CF as the RNA-binding subunit required for apoB mRNA C-to-U editing, defining how a deaminase achieves site-specific RNA editing.\",\n      \"evidence\": \"Reconstituted editing assay, immunodepletion, co-fractionation and antisense knockdown of A1CF binding apoB RNA and APOBEC1\",\n      \"pmids\": [\"11577082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not define the structural basis of substrate recognition\",\n        \"In vivo necessity not yet tested genetically\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified CUGBP2 as a regulatory component of the editing holoenzyme, showing the editosome is a multi-protein assembly whose activity can be modulated by accessory factors.\",\n      \"evidence\": \"Co-fractionation, reciprocal co-IP, nuclear co-localization, and dose-dependent inhibition of editing rescued by APOBEC1 or A1CF\",\n      \"pmids\": [\"11577082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Physiological context of CUGBP2 inhibition unclear\",\n        \"Whether CUGBP2 competes with A1CF for RNA or protein binding not resolved\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapped the A1CF gene architecture and complex alternative splicing, raising the question of whether editing tracks with transcript abundance.\",\n      \"evidence\": \"cDNA isolation, RT-PCR, Northern blot, developmental expression panel of the ~80 kb 15-exon gene\",\n      \"pmids\": [\"11718896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional roles of the distinct transcripts not assigned\",\n        \"Reason editing does not track with mRNA abundance not explained\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the biochemical mechanism by which A1CF enhances editing, showing it lowers the temperature requirement for a substrate conformational transition.\",\n      \"evidence\": \"Purified recombinant protein steady-state kinetics and temperature-optimum analysis with and without ACF\",\n      \"pmids\": [\"15273326\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single in vitro study, single lab\",\n        \"Structural detail of the RNA conformational transition not resolved\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed an APOBEC1-independent essential role for A1CF in cell survival and early development, decoupling its editing function from its viability function.\",\n      \"evidence\": \"Homologous-recombination knockout with blastocyst-stage lethality plus siRNA-induced apoptosis in APOBEC1-expressing and -deficient hepatoma cells\",\n      \"pmids\": [\"16055734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular pathway underlying survival function not identified\",\n        \"Targets responsible for embryonic lethality unknown\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved the domain organization and oligomeric architecture of A1CF in the editosome, proposing a dimer-of-ACF / dimer-of-APOBEC1 assembly on the mooring sequence.\",\n      \"evidence\": \"Limited proteolysis, truncation mutagenesis, in vitro editing, live-cell FRET, and immunoprecipitation showing RNA-bridged homomultimers via three RRMs\",\n      \"pmids\": [\"20541536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Stoichiometry inferred, not solved structurally\",\n        \"Functional necessity of multimerization in vivo untested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Overturned the obligate-editing-factor model by showing A1CF is dispensable for adult C-to-U editing under normal physiology.\",\n      \"evidence\": \"Conditional knockout mouse with quantified editing at multiple targets including apoB in liver and intestine\",\n      \"pmids\": [\"28069890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not identify the compensating factor\",\n        \"Reconciliation with essential embryonic role not addressed\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved the redundancy by identifying RBM47 as a tissue-specific alternative cofactor that compensates for A1CF in vivo.\",\n      \"evidence\": \"Single and double tissue-specific conditional knockouts with editing quantification and adenoviral APOBEC1 rescue\",\n      \"pmids\": [\"30309881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Determinants of tissue-specific cofactor choice unclear\",\n        \"Whether A1CF and RBM47 co-occupy the same editosomes not established\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that A1CF and RBM47 are not interchangeable, showing differential target selectivity in a clean heterologous system.\",\n      \"evidence\": \"Reconstitution in HEK293T cells lacking endogenous factors with a fluorescence-based editing reporter across multiple targets\",\n      \"pmids\": [\"30844405\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Sequence/structural basis of differential selectivity not defined\",\n        \"Single lab, heterologous context\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded A1CF function beyond editing to alternative splicing control of hepatic metabolic enzymes, linking it to systemic glucose and lipid handling.\",\n      \"evidence\": \"Conditional hepatic knockout with RNA-seq, isoform RT-PCR, and metabolic phenotyping\",\n      \"pmids\": [\"31597092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct RNA-binding map at spliced targets not defined\",\n        \"Splicing machinery partners not identified\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the A1CF protein interactome and showed a disease-associated variant rewires its partners, connecting interaction changes to altered VLDL secretion.\",\n      \"evidence\": \"Co-IP mass spectrometry of wild-type versus G398S A1CF with metabolomics, RNA-seq, and oxygen consumption assays\",\n      \"pmids\": [\"32786677\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequences of individual interactions not reconstituted\",\n        \"Mechanism linking mitochondrial-translation partner loss to VLDL secretion unclear\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established an RNA-independent protein-protein function for A1CF in modulating NF-\\u03baB signaling via direct NKRF binding through RRM1.\",\n      \"evidence\": \"Co-IP, domain-mapping mutagenesis, immunofluorescence, proliferation assays, and xenograft model in renal carcinoma cells\",\n      \"pmids\": [\"38612387\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; structural detail of RRM1-NKRF interface not resolved\",\n        \"Generality across cell types untested\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed A1CF within a transcription-to-splicing regulatory axis in pancreatic \\u03b2 cells downstream of HNF1A, linking it to type 2 diabetes pathophysiology.\",\n      \"evidence\": \"HNF1A ChIP-seq, conditional knockout with RNA-seq splicing analysis, human islet genetic association, and \\u03b2-cell functional assays\",\n      \"pmids\": [\"40774250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct A1CF binding to the regulated \\u03b2-cell transcripts not mapped\",\n        \"Causal splicing targets driving \\u03b2-cell dysfunction not pinpointed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How A1CF's distinct activities — RNA editing, alternative splicing, embryonic survival, NF-\\u03baB modulation, and germ-cell/gamete effects — are integrated and selected in different tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No unifying mechanism connecting editing, splicing, and survival functions\",\n        \"Structural basis of target and partner selection across contexts not defined\",\n        \"Cancer and germ-cell phenotypes rest on low-confidence, single-lab evidence\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 9, 16]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [9, 16]}\n    ],\n    \"complexes\": [\"apoB mRNA C-to-U editosome (editing holoenzyme)\"],\n    \"partners\": [\"APOBEC1\", \"RBM47\", \"CUGBP2\", \"NKRF\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}