{"gene":"HCFC1","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2003,"finding":"Separate regions of HCF-1 critical for cell proliferation associate with the Sin3 histone deacetylase (HDAC) complex and a human trithorax-related Set1/Ash2 histone H3-K4 methyltransferase (HMT) complex; HCF-1 tethers these two complexes together, and the transcriptional activator VP16 selectively binds HCF-1 associated with the Set1/Ash2 HMT complex in the absence of the Sin3 HDAC complex.","method":"Co-immunoprecipitation, mass spectrometry, in vitro binding assays, histone methyltransferase activity assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and biochemical activity assays with multiple orthogonal methods in a highly-cited foundational paper","pmids":["12670868"],"is_preprint":false},{"year":2007,"finding":"HCF-1 associates with both activator (E2F1, E2F3a) and repressor (E2F4) E2F proteins in a cell-cycle-selective manner; during the G1-to-S phase transition, HCF-1 recruits MLL and Set-1 histone H3K4 methyltransferases to E2F-responsive promoters, inducing histone methylation and transcriptional activation.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assays, cell-cycle synchronization","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, ChIP, reporter) in a highly-cited paper","pmids":["17612494"],"is_preprint":false},{"year":2011,"finding":"O-GlcNAc transferase (OGT) both O-GlcNAcylates the HCF-1N subunit and directly cleaves HCF-1 at the HCF-1PRO repeat sequences, mediating the proteolytic maturation of HCF-1 into HCF-1N and HCF-1C subunits; replacement of the HCF-1PRO repeats by a heterologous cleavage signal permits proteolysis but fails to activate HCF-1C M-phase functions.","method":"In vitro cleavage assays, mutagenesis of HCF-1PRO repeats, mass spectrometry, siRNA knockdown, cell-cycle phenotype analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — reconstitution and mutagenesis with functional validation; replicated in subsequent structural paper","pmids":["21295698"],"is_preprint":false},{"year":2013,"finding":"The tetratricopeptide-repeat (TPR) domain of OGT binds the C-terminal portion of an HCF-1 proteolytic repeat such that the cleavage region lies in the glycosyltransferase active site; cleavage occurs between cysteine and glutamate residues producing a pyroglutamate product; converting the cleavage-site glutamate to serine converts the proteolytic repeat into a glycosylation substrate.","method":"Crystal structure of OGT:HCF-1PRO complex, mutagenesis, in vitro cleavage and glycosylation assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis and in vitro biochemical validation","pmids":["24311690"],"is_preprint":false},{"year":2003,"finding":"Proteolytic processing of HCF-1 is necessary to separate two distinct cell-cycle functions: the HCF-1N subunit promotes G1-phase progression, while the HCF-1C subunit is required for proper cytokinesis/exit from mitosis.","method":"siRNA knockdown of HCF-1 in multiple cell lines, expression of separate HCF-1N and HCF-1C subunits, cell-cycle phenotype analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function with defined cellular phenotype and subunit rescue experiments","pmids":["12743030"],"is_preprint":false},{"year":2004,"finding":"HCF-1C subunit depletion causes a switch from monomethyl to dimethyl lysine 20 of histone H4 (H4-K20) during mitosis and leads to defective chromosome alignment and segregation; HCF-1C regulates expression of the H4-K20 methyltransferase PR-Set7, and upregulation of PR-Set7 upon HCF-1 loss causes improper mitotic H4-K20 methylation and cytokinesis defects.","method":"siRNA knockdown, chromatin fractionation, quantitative ChIP, immunofluorescence, western blot","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing pathway position and histone modification mechanism","pmids":["15200950"],"is_preprint":false},{"year":2001,"finding":"HCF-1 is naturally bound to chromatin in uninfected cells through its VP16-interaction domain; a proline-to-serine mutation in tsBN67 cells causes temperature-sensitive dissociation of HCF-1 from chromatin prior to cell proliferation arrest, establishing chromatin association as essential for HCF-1's role in cell proliferation.","method":"Chromatin fractionation, temperature-shift experiments, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — direct fractionation with functional consequence established by genetic mutation","pmids":["11340173"],"is_preprint":false},{"year":2009,"finding":"BAP1 deubiquitinase interacts with HCF-1 via its HCF-1 binding motif and deubiquitinates Lys-48-linked polyubiquitin chains on the HCF-1N Kelch domain; this interaction is required for BAP1-mediated regulation of cell proliferation.","method":"Mass spectrometry of co-purified proteins, co-immunoprecipitation, ubiquitination assays, RNAi, dominant-negative mutant analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing PTM writer/eraser relationship and functional consequence","pmids":["19815555"],"is_preprint":false},{"year":2008,"finding":"C. elegans HCF-1 physically associates with DAF-16/FOXO and limits DAF-16 recruitment to target gene promoters; loss of hcf-1 results in daf-16-dependent lifespan extension of up to 40% and altered expression of DAF-16-regulated genes.","method":"Co-immunoprecipitation, ChIP, genetic epistasis (double mutants), lifespan assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — epistasis combined with physical interaction and ChIP data in a well-cited paper","pmids":["18828672"],"is_preprint":false},{"year":2011,"finding":"In C. elegans, HCF-1 acts downstream of SIR-2.1 to regulate DAF-16/FOXO target gene expression; SIR-2.1/SIRT1 and HCF-1 form protein complexes in both worms and mammalian cells; mammalian HCF-1 represses FOXO/SIRT1 target genes analogously.","method":"Genetic epistasis, gene expression profiling, co-immunoprecipitation in C. elegans and mammalian cells","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — epistasis with reciprocal co-IP and gene expression profiling across two organisms","pmids":["21909281"],"is_preprint":false},{"year":2010,"finding":"THAP1 associates with HCF-1 via a consensus HCF-1 binding motif (HBM) in vitro and in vivo, and endogenous THAP1 mediates recruitment of HCF-1 to the RRM1 promoter during endothelial cell proliferation; HCF-1 is essential for THAP1-dependent transcriptional activation of RRM1.","method":"Proteomic analysis, co-immunoprecipitation, in vitro binding, ChIP, RNAi","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods demonstrating physical interaction and functional consequence at a specific promoter","pmids":["20200153"],"is_preprint":false},{"year":2013,"finding":"HCFC1 binds to consensus sites in the MMACHC promoter and is required for transcriptional regulation of MMACHC; siRNA-mediated knockdown of HCFC1 results in coordinate downregulation of MMACHC mRNA, and missense mutations in the HCFC1 kelch domain in cblX patients cause severe reduction of MMACHC mRNA and protein.","method":"Exome sequencing, ChIP (consensus binding sites), siRNA knockdown, RT-PCR, western blot","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple methods (ChIP, knockdown, patient fibroblasts) converging on a specific transcriptional target","pmids":["24011988"],"is_preprint":false},{"year":2013,"finding":"In HeLa cells, HCFC1 is bound to ~5,400 active CpG-island promoters and co-localizes with ZNF143, THAP11 (Ronin), GABP, and YY1 transcription factors at ~90% of HCFC1-bound promoters, establishing HCFC1 as a broadly acting transcriptional scaffold.","method":"ChIP-seq, motif analysis, co-localization analysis","journal":"Genome research","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP-seq establishing chromatin occupancy at scale","pmids":["23539139"],"is_preprint":false},{"year":2010,"finding":"Ronin (THAP11) binds with HCF-1 to a highly conserved enhancer element and together regulate genes involved in transcription initiation, mRNA splicing, and cell metabolism to support ES cell self-renewal; Ronin/HCF-1 both represses and activates target genes.","method":"ChIP-seq, co-immunoprecipitation, gene expression profiling, loss-of-function","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — genome-wide ChIP combined with physical interaction data and functional analysis","pmids":["20581084"],"is_preprint":false},{"year":2000,"finding":"HCF-1 contains two matched pairs of self-association sequences (SAS1 and SAS2); SAS1 consists of a 43-amino-acid HCF-1N region that associates with a tandem pair of fibronectin type 3 (Fn3) repeats in the HCF-1C subunit; HCF-1C contains a nuclear localization signal that recruits HCF-1N subunits to the nucleus.","method":"Co-immunoprecipitation, deletion mutagenesis, subcellular localization assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — systematic mutagenesis with co-IP defining structural requirements for subunit association","pmids":["10958670"],"is_preprint":false},{"year":2012,"finding":"The SAS1 self-association elements from HCF-1N and HCF-1C subunits form an interdigitated fibronectin type 3 (Fn3) tandem repeat structure; the C-terminal NLS recruited by this interdigitated SAS1 structure is required for effective formation of the HSV VP16-induced transcriptional regulatory complex.","method":"Crystal structure of SAS1, mutagenesis, VP16-induced complex formation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional mutagenesis validation","pmids":["23045687"],"is_preprint":false},{"year":2016,"finding":"OGT-mediated glycosylation and HCF-1 proteolysis occur through separable mechanisms within the same active site; a specific TPR domain contact with HCF-1 is critical for proteolysis but not Ser/Thr glycosylation; key catalytic residues and UDP-GlcNAc oxygen required for glycosylation are dispensable for proteolysis.","method":"Mutagenesis of OGT catalytic and TPR domains, in vitro glycosylation and cleavage assays, engineered single-activity OGT enzymes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — systematic in vitro mutagenesis and reconstitution distinguishing two enzymatic mechanisms","pmids":["27056667"],"is_preprint":false},{"year":2015,"finding":"The HCF-1PRO repeat contains distinct OGT-binding sites: the cleavage-site glutamate inhibits OGT/UDP-GlcNAc association, while a novel OGT-binding sequence near the first HCF-1PRO-repeat cleavage signal enhances cleavage.","method":"In vitro OGT binding and cleavage assays, mutagenesis, mass spectrometry","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis mapping distinct binding determinants","pmids":["26305326"],"is_preprint":false},{"year":2006,"finding":"The HCF-1 processing/PRO domain interacts with the transcriptional coactivator/corepressor FHL2; this interaction is specific to the non-processed (uncleavaged) HCF-1 and costimulates transcription of an HCF-1-dependent target gene, establishing that site-specific proteolysis of HCF-1 regulates its interaction with protein cofactors.","method":"Co-immunoprecipitation, reporter assays, mutational analysis of PRO repeats","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with functional reporter assays; single lab","pmids":["16624878"],"is_preprint":false},{"year":2002,"finding":"The C-terminal WYF domain of HCF-1 interacts with the MYND domain of PDCD2; overexpression of PDCD2 suppresses HCF-1 complementation of the tsBN67 temperature-sensitive proliferation defect, identifying PDCD2 as a negative regulator of HCF-1.","method":"Co-immunoprecipitation, complementation assay in tsBN67 cells, overexpression of dominant-interfering domains","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP with functional complementation assay; single lab","pmids":["12149646"],"is_preprint":false},{"year":2002,"finding":"Inactivation of pRb family members (pRb, p107, p130) by SV40 large T antigen or adenovirus E1A rescues both the cell proliferation and cytokinesis defects of HCF-1-deficient tsBN67 cells without restoring HCF-1 chromatin association, placing HCF-1 upstream of or in opposition to pRb family function in cell cycle control.","method":"Genetic rescue (oncoprotein expression), temperature-shift experiments, chromatin fractionation","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis via rescue experiment; single lab","pmids":["12215534"],"is_preprint":false},{"year":2002,"finding":"HCF-1 is required for spliceosome assembly and pre-mRNA splicing; it interacts with complexes containing U1 and U5 splicing snRNPs in uninfected cells; the tsBN67 missense mutation disrupts these interactions at non-permissive temperature and causes inefficient spliceosome assembly.","method":"Co-immunoprecipitation with snRNPs, in vitro splicing assays in nuclear extracts, rescue by wild-type HCF-1 expression","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro assay with rescue experiment; single lab","pmids":["12456665"],"is_preprint":false},{"year":2010,"finding":"HCF-1 localizes to HSV-1 DNA replication sites late in infection; HCF-1 interacts directly and simultaneously with both HSV DNA replication proteins and the cellular histone chaperone Asf1b; depletion of Asf1b results in significantly reduced viral DNA accumulation.","method":"Co-immunoprecipitation, immunofluorescence localization to viral replication foci, siRNA depletion with viral DNA quantification","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — direct interaction and localization with functional consequence; single lab","pmids":["20133788"],"is_preprint":false},{"year":2009,"finding":"E2F1 associates with HCF-1 through a short DHQY sequence; this interaction enables E2F1 to stimulate both DNA damage and apoptosis; HCF-1 and the MLL family of H3K4 methyltransferases have important functions in E2F1-induced apoptosis; sequence changes in the E2F1 HCF-1-binding site modulate E2F1-induced apoptosis up and down.","method":"Mutagenesis of E2F1 HCF-1-binding motif, co-immunoprecipitation, apoptosis and DNA damage assays, siRNA knockdown","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with functional phenotype; single lab","pmids":["19763085"],"is_preprint":false},{"year":2003,"finding":"The HCF-binding motif (HBM) in Krox20 and E2F4 mediates association with the HCF-1 beta-propeller (Kelch) domain; Krox20 requires a functional HBM for both transactivation and HCF-1 association; the HCF-1C activation domain contributes to activation by Krox20, possibly through recruitment of p300.","method":"Co-immunoprecipitation, mutagenesis of HBM, reporter assays, pulldown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with co-IP and reporter assays; single lab","pmids":["14532282"],"is_preprint":false},{"year":2002,"finding":"HCF-1 contains an activation domain (HCF-1AD) in its C-terminal subunit required for maximal transactivation by VP16 and LZIP; co-expression of p300 augments HCF-1AD activity; cells lacking the HCF-1AD show reduced HSV immediate-early gene expression and lower viral titers.","method":"Reporter assays, mutagenesis, HSV infection with titer measurement","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis with functional viral and reporter assays; single lab","pmids":["12271126"],"is_preprint":false},{"year":2008,"finding":"In sensory neurons, HCF-1 is specifically sequestered at the Golgi apparatus (not the ER); disruption of the Golgi causes rapid relocalization of HCF-1 to the nucleus, correlating with a regulatory mechanism for HSV reactivation.","method":"Immunofluorescence, organelle co-localization, Golgi disruption experiments in primary neuronal cultures","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence for viral reactivation; single lab","pmids":["18667495"],"is_preprint":false},{"year":2002,"finding":"The nuclear export factor HPIP contains a functional HCF-binding motif that interacts with the HCF-1 beta-propeller domain; HPIP shuttles between nucleus and cytoplasm in a CRM1-dependent manner, and its overexpression leads to accumulation of HCF-1 in the cytoplasm.","method":"Co-immunoprecipitation, subcellular localization assays, CRM1 inhibitor treatment, overexpression","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP with localization phenotype; single lab","pmids":["12235138"],"is_preprint":false},{"year":2007,"finding":"Loss of C. elegans HCF-1 leads to reduced levels of phospho-histone H3 serine 10 (H3S10P) in viable embryos; mammalian cells with defective HCF-1 also display mitotic H3S10P defects, suggesting a conserved role for HCF-1 in regulating mitotic histone phosphorylation.","method":"Genetic deletion in C. elegans, immunofluorescence, temperature-shift experiments in mammalian cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined histone modification phenotype in two organisms; single lab","pmids":["18043729"],"is_preprint":false},{"year":2019,"finding":"HCF-1 is O-GlcNAcylated in response to glucose as a prerequisite for its binding to ChREBP; HCF-1 then recruits OGT to O-GlcNAcylate ChREBP and promote its activation; the HCF-1:ChREBP complex at lipogenic gene promoters regulates H3K4 trimethylation and recruits the histone demethylase PHF2 for epigenetic activation.","method":"Co-immunoprecipitation, ChIP, O-GlcNAcylation assays, glucose-stimulation experiments, genetic knockdown","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal biochemical and genetic methods establishing a nutrient-responsive mechanism","pmids":["31227231"],"is_preprint":false},{"year":2019,"finding":"HSP90 maintains the stability of HCFC1 protein in the nucleus; HSP90 inhibition leads to loss of HCFC1 and reduced expression of HCFC1-targeted cell-cycle genes.","method":"Systematic nuclear HSP90 interactome analysis (three orthogonal methods), biochemical stability assays, gene expression analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — three independent interactome methods identifying HSP90 as HCFC1 stability factor; single lab","pmids":["31693902"],"is_preprint":false},{"year":2012,"finding":"THAP11 associates physically with HCF-1 and recruits it to target promoters; THAP11-mediated gene regulation and chromatin association require HCF-1, while HCF-1 recruitment at THAP11 target genes requires THAP11, establishing mutual dependence.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, gene expression profiling","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods; single lab","pmids":["22371484"],"is_preprint":false},{"year":2015,"finding":"The ACTACA submotif shared by THAP11 and ZNF143 directs recruitment of THAP11 and HCFC1 to ZNF143-occupied loci; CRISPR-Cas9-mediated alteration of the ACTACA submotif at endogenous promoters alters gene transcription and histone modifications, establishing the DNA sequence basis for THAP11/ZNF143/HCFC1 complex chromatin recruitment.","method":"CRISPR-Cas9 mutagenesis, chromosomally integrated synthetic constructs, ChIP, gene expression analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — CRISPR editing at endogenous loci combined with chromatin and transcriptional readouts; single lab","pmids":["26416877"],"is_preprint":false},{"year":2020,"finding":"HCF-1 activates CDC42 expression by binding to the -881 to -575 region upstream of the CDC42 transcription start site; overexpression of constitutively active CDC42F28L rescues G1-phase delay and multinucleate mitotic defects caused by HCF-1 loss.","method":"ChIP, promoter reporter assays, siRNA knockdown, rescue by CDC42 overexpression","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with promoter deletion and genetic rescue; single lab","pmids":["33097698"],"is_preprint":false},{"year":2021,"finding":"SETD5 regulates RNA polymerase II pausing and release at E2F target gene promoters in hematopoietic stem cells in cooperation with HCF-1 and the PAF1 complex; SETD5 and HCF-1 co-occupy E2F target promoters.","method":"ChIP-seq, co-immunoprecipitation, conditional knockout, transcriptome analysis","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP-seq and co-IP with in vivo knockout; single lab","pmids":["34853439"],"is_preprint":false},{"year":2022,"finding":"HCFC1 and RONIN (THAP11) jointly regulate MMACHC expression and also regulate genes encoding ribosome protein subunits; mouse models of Hcfc1/Ronin mutations show reduced expression of ribosome biogenesis genes and phenotypes consistent with ribosomopathy in addition to cblC-like metabolic defects.","method":"Mouse genetic models, transcriptome analysis, metabolic phenotyping","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo mouse models with transcriptome profiling establishing pathway; peer-reviewed","pmids":["35013307"],"is_preprint":false},{"year":2018,"finding":"The conserved threonine-rich region of the HCF-1PRO repeat is tightly bound by the OGT TPR region and activates both OGT glycosylation and proteolysis activities; linkage of this region to heterologous sequences potentiates both Ser glycosylation and cleavage of non-HCF-1PRO sequences containing an appropriately positioned glutamate.","method":"In vitro glycosylation assays with co-substrate analogs, domain-swap mutagenesis, mass spectrometry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with systematic mutagenesis and multiple substrate analogs","pmids":["30224358"],"is_preprint":false},{"year":2024,"finding":"KDM2A (lysine demethylase targeting H3K36me3) recruits HCF-1 and E2F1 to promoters of meiosis-entry genes (Stra8, Meiosin, Spo11, Sycp1) in male germ cells; KDM2A deficiency disrupts H3K36me2/3 deposition and impairs meiotic entry.","method":"Conditional knockout, ChIP, co-immunoprecipitation, spermatogenesis phenotype analysis","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP, ChIP and in vivo knockout with defined phenotype; single lab","pmids":["39160277"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, SET-26 recruits HCF-1 to chromatin (HCF-1 localization is largely dependent on functional SET-26), and together they antagonize the histone deacetylase HDA-1 to regulate longevity and gene expression; HDA-1 opposes SET-26 and HCF-1 at a subset of common target gene promoters.","method":"Genetic epistasis, ChIP, transcriptome analysis, lifespan assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with ChIP establishing recruitment dependency; single lab","pmids":["38485937"],"is_preprint":false},{"year":2025,"finding":"Hepatocyte-specific deletion of HCF-1 causes progressive loss of OGT protein levels and global O-GlcNAcylation without altering OGT mRNA, indicating post-translational regulation of OGT by HCF-1; HCF-1 loss results in reduced nuclear OGT and O-GlcNAcylation, mimicking fasting conditions.","method":"Conditional knockout mouse model, immunofluorescence, western blot, RT-qPCR, histology","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — conditional knockout with multiple readouts; single lab","pmids":["40754593"],"is_preprint":false},{"year":2026,"finding":"HCF-1 binds to the C-terminal ~200 amino acids of ASXL1 and promotes ASXL1 turnover in a proteasome-dependent manner; HCF-1 and BAP1 show reciprocal antagonism in association with ASXL1, and deletion of the HCF-1-binding region stabilizes ASXL1.","method":"P2A dual-reporter stability assay, co-immunoprecipitation, proteasome inhibition, domain deletion mutagenesis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical methods establishing regulatory interaction; single lab","pmids":["41968849"],"is_preprint":false},{"year":2016,"finding":"HCF1 and OCT2 bind cooperatively with EBNA1 at the Epstein-Barr virus OriP; HCF1 depletion leads to loss of H3K4me3 and H3 acetylation at EBV latency promoters and gain of H3K9me3, and results in loss of EBV episomes and viral reactivation.","method":"ChIP, co-immunoprecipitation, siRNA knockdown, episome quantification","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple ChIP and knockdown methods; single lab","pmids":["27009953"],"is_preprint":false},{"year":2013,"finding":"HCF-1 is required for INS-1 pancreatic β-cell glucose-stimulated insulin secretion; HCF-1 and E2F1 co-localize to the Pdx1 promoter by ChIP, and HCF-1 loss reduces Pdx1 expression.","method":"siRNA knockdown, glucose-stimulated insulin secretion assay, ChIP","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP with functional assay; single lab","pmids":["24250814"],"is_preprint":false},{"year":2024,"finding":"HSP90 inhibition reduces TFEB transcription by decreasing HSP90AA1-HCFC1 interaction, which prevents HCFC1 from binding to the TFEB proximal promoter region, leading to reduced LC3 and increased mitochondria-derived vesicle formation.","method":"Co-immunoprecipitation, ChIP, western blot, siRNA knockdown","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP and ChIP establishing mechanistic link; single lab","pmids":["39461872"],"is_preprint":false}],"current_model":"HCFC1 (HCF-1) is a large chromatin-associated transcriptional co-regulator that undergoes proteolytic maturation by O-GlcNAc transferase (OGT), which cleaves the HCF-1PRO repeats within its own active site to generate noncovalently associated HCF-1N and HCF-1C subunits; HCF-1N promotes G1-phase progression by tethering histone H3K4 methyltransferase (Set1/Ash2, MLL) and Sin3-HDAC complexes to sequence-specific transcription factors (E2F1, THAP11, ZNF143, VP16, and others) via its Kelch/beta-propeller domain, while HCF-1C ensures proper cytokinesis by regulating PR-Set7 expression and mitotic histone H4-K20 methylation; HCF-1 is also O-GlcNAcylated by OGT in a nutrient-responsive manner to couple glucose signals to ChREBP-driven lipogenic gene activation, and in sensory neurons its cytoplasmic sequestration at the Golgi apparatus controls its nuclear availability for HSV reactivation."},"narrative":{"teleology":[{"year":2000,"claim":"Defining how HCF-1N and HCF-1C subunits remain associated and reach the nucleus resolved the basic architecture of the processed heterodimer: matched self-association sequences (SAS1/SAS2) mediate inter-subunit binding, and the HCF-1C NLS drives nuclear import of both subunits.","evidence":"Co-immunoprecipitation and deletion mutagenesis with subcellular localization assays","pmids":["10958670"],"confidence":"High","gaps":["Structural basis of SAS interactions unknown at this point","Whether SAS mutations affect endogenous HCF-1 function in vivo not tested"]},{"year":2001,"claim":"Demonstrating that HCF-1 is constitutively chromatin-bound in uninfected cells — and that loss of chromatin association precedes the tsBN67 proliferation arrest — established chromatin association as essential for HCF-1's proliferative function, independent of any viral context.","evidence":"Chromatin fractionation and temperature-shift experiments in tsBN67 cells","pmids":["11340173"],"confidence":"High","gaps":["Identity of chromatin targets unknown","Mechanism of chromatin recruitment unresolved"]},{"year":2002,"claim":"Epistasis experiments placing HCF-1 upstream of pRb family function, identification of the HCF-1C activation domain required for VP16/LZIP-mediated transcription, discovery of HPIP as a nuclear-export factor for HCF-1, involvement of HCF-1 in spliceosome assembly, and identification of PDCD2 as a negative regulator collectively defined HCF-1 as a multifunctional nuclear regulator with roles beyond viral transactivation.","evidence":"Genetic rescue by pRb-inactivating oncoproteins, reporter assays with HCF-1AD mutants, HSV infection assays, co-IP with snRNPs, in vitro splicing, co-IP with PDCD2 and HPIP","pmids":["12215534","12271126","12456665","12235138","12149646"],"confidence":"Medium","gaps":["Splicing role not confirmed by independent labs","Whether HPIP-mediated cytoplasmic relocalization is physiologically regulated unknown","Direct pRb interaction not demonstrated"]},{"year":2003,"claim":"Two foundational discoveries established that HCF-1 proteolytic processing separates distinct cell-cycle functions (HCF-1N for G1 progression, HCF-1C for cytokinesis) and that HCF-1 scaffolds antagonistic chromatin-modifying complexes (Set1/Ash2 HMT and Sin3 HDAC) on the same molecule, with VP16 selectively engaging the HMT-associated form.","evidence":"siRNA knockdown with subunit rescue, co-IP/mass spectrometry with histone methyltransferase activity assays","pmids":["12743030","12670868"],"confidence":"High","gaps":["How selectivity between HMT and HDAC complexes is achieved at specific promoters unknown","Identity of endogenous transcription factors directing complex selection unclear"]},{"year":2004,"claim":"HCF-1C was shown to control mitotic H4-K20 methylation by regulating PR-Set7 expression, explaining the cytokinesis defect: HCF-1 loss upregulates PR-Set7, causing aberrant dimethylation of H4-K20 and defective chromosome segregation.","evidence":"siRNA knockdown, quantitative ChIP, chromatin fractionation, immunofluorescence","pmids":["15200950"],"confidence":"High","gaps":["Direct transcriptional mechanism by which HCF-1C represses PR-Set7 not established","Whether other H4-K20 methyltransferases are involved not tested"]},{"year":2007,"claim":"Linking HCF-1 to cell-cycle-regulated E2F proteins resolved how HCF-1 activates endogenous G1/S gene expression: HCF-1 associates selectively with activator E2Fs during G1-to-S transition and recruits MLL/Set1 to E2F-responsive promoters for H3K4 methylation.","evidence":"Co-IP, ChIP, reporter assays with cell-cycle synchronization","pmids":["17612494"],"confidence":"High","gaps":["How HCF-1 switches from repressor E2F4 to activator E2F1 complexes not mechanistically resolved","Whether HCF-1-E2F interaction is direct or bridged unknown"]},{"year":2008,"claim":"Two parallel advances expanded HCF-1 biology: in C. elegans, HCF-1 was found to physically restrain DAF-16/FOXO at target promoters such that hcf-1 loss extends lifespan; in sensory neurons, HCF-1 was found sequestered at the Golgi apparatus, with Golgi disruption releasing it to the nucleus — a mechanism controlling HSV reactivation.","evidence":"Co-IP and ChIP with genetic epistasis and lifespan assays (C. elegans); immunofluorescence and Golgi disruption in primary neurons","pmids":["18828672","18667495"],"confidence":"High","gaps":["Mechanism of Golgi tethering unknown","Whether mammalian FOXO factors are similarly regulated by HCF-1 in longevity not demonstrated in vivo"]},{"year":2009,"claim":"BAP1 deubiquitinase was identified as removing K48-linked polyubiquitin from the HCF-1N Kelch domain, linking HCF-1 to tumor-suppressor pathways; separately, the E2F1–HCF-1 interaction was shown to channel E2F1 activity toward apoptosis via MLL recruitment.","evidence":"Mass spectrometry, ubiquitination assays, co-IP (BAP1); mutagenesis of E2F1 HBM with apoptosis assays","pmids":["19815555","19763085"],"confidence":"High","gaps":["Whether BAP1-mediated deubiquitination stabilizes HCF-1 or alters its interactions not fully resolved","Mechanism distinguishing E2F1 apoptotic versus proliferative outputs unclear"]},{"year":2010,"claim":"Genome-wide studies with THAP11 (Ronin) and THAP1 established HCF-1 as a broadly acting transcriptional scaffold recruited by zinc-finger/THAP-domain proteins to regulate ES cell self-renewal and endothelial proliferation genes.","evidence":"ChIP-seq, co-IP, gene expression profiling, RNAi in ES cells and endothelial cells","pmids":["20581084","20200153"],"confidence":"High","gaps":["Whether THAP11 and THAP1 compete or cooperate for HCF-1 at shared targets unclear","Structural basis of THAP–HCF-1 interaction not determined"]},{"year":2011,"claim":"The discovery that OGT both O-GlcNAcylates HCF-1N and proteolytically cleaves HCF-1PRO repeats within its own active site fundamentally redefined HCF-1 maturation as an OGT-dependent process, linking nutrient sensing to HCF-1 function.","evidence":"In vitro cleavage assays, mutagenesis, mass spectrometry, siRNA, cell-cycle analysis","pmids":["21295698"],"confidence":"High","gaps":["How proteolysis is temporally regulated in vivo unknown","Whether all six PRO repeats are cleaved equivalently not established"]},{"year":2013,"claim":"Multiple advances converged: the crystal structure of OGT bound to HCF-1PRO revealed the cleavage mechanism (pyroglutamate product); ChIP-seq in HeLa cells showed HCFC1 at ~5,400 CpG-island promoters with ZNF143/THAP11/GABP/YY1; and missense HCFC1 Kelch-domain mutations were identified as the cause of X-linked cblX disorder through transcriptional failure at the MMACHC promoter.","evidence":"Crystal structure with mutagenesis (OGT); ChIP-seq (HeLa); exome sequencing, ChIP, siRNA in patient fibroblasts (cblX)","pmids":["24311690","23539139","24011988"],"confidence":"High","gaps":["Whether all ~5,400 bound promoters are functionally regulated by HCF-1 unknown","Structural basis for Kelch domain mutations causing cblX not resolved","Full spectrum of cblX-affected target genes beyond MMACHC not catalogued"]},{"year":2015,"claim":"The ACTACA DNA motif shared by THAP11 and ZNF143 was shown to direct HCFC1 recruitment to chromatin via CRISPR mutagenesis of endogenous promoters, establishing the cis-regulatory basis for the THAP11/ZNF143/HCFC1 module.","evidence":"CRISPR-Cas9 editing of endogenous promoters, ChIP, gene expression analysis","pmids":["26416877"],"confidence":"High","gaps":["Whether other DNA motifs recruit HCFC1 independently of THAP11/ZNF143 not tested","Role of GABP and YY1 in HCFC1 recruitment not mechanistically distinguished"]},{"year":2016,"claim":"Separation-of-function OGT mutants demonstrated that HCF-1 proteolysis and O-GlcNAc glycosylation use overlapping but mechanistically separable catalytic routes within the same OGT active site, with a specific TPR contact required only for cleavage.","evidence":"Systematic mutagenesis of OGT catalytic and TPR domains with in vitro glycosylation and cleavage assays","pmids":["27056667"],"confidence":"High","gaps":["In vivo consequences of selectively ablating OGT cleavage versus glycosylation not tested","Whether other OGT substrates compete with HCF-1 for cleavage unknown"]},{"year":2019,"claim":"HCF-1 was shown to couple glucose sensing to lipogenic gene expression: glucose-stimulated O-GlcNAcylation of HCF-1 enables its binding to ChREBP, followed by OGT recruitment and ChREBP activation, with H3K4me3 and PHF2 demethylase activity at lipogenic promoters.","evidence":"Co-IP, ChIP, O-GlcNAcylation assays, glucose stimulation, genetic knockdown","pmids":["31227231"],"confidence":"High","gaps":["Whether HCF-1 O-GlcNAcylation is reversible and dynamically regulated unknown","Relative contribution of HCF-1 versus other ChREBP cofactors not established"]},{"year":2022,"claim":"Mouse models of Hcfc1/Ronin (Thap11) mutations revealed that the HCFC1–RONIN axis regulates not only MMACHC but also ribosome biogenesis genes, with mutant phenotypes consistent with ribosomopathy, broadening the disease mechanism beyond cobalamin metabolism.","evidence":"Mouse genetic models, transcriptome analysis, metabolic phenotyping","pmids":["35013307"],"confidence":"High","gaps":["Which ribosome protein genes are direct versus indirect targets not fully resolved","Whether ribosomopathy phenotypes are independent of cobalamin deficiency not established"]},{"year":2025,"claim":"Hepatocyte-specific HCF-1 deletion revealed that HCF-1 post-translationally stabilizes OGT protein and sustains global O-GlcNAcylation, establishing a reciprocal regulatory relationship between HCF-1 and OGT beyond the known OGT→HCF-1 direction.","evidence":"Conditional knockout mouse model, immunofluorescence, western blot, RT-qPCR","pmids":["40754593"],"confidence":"Medium","gaps":["Mechanism of HCF-1-dependent OGT stabilization not determined","Whether this relationship operates in non-hepatic tissues unknown","Single lab, not independently confirmed"]},{"year":null,"claim":"Key unresolved questions include how HCF-1 selects between activating (MLL/Set1) and repressive (Sin3-HDAC) complexes at individual promoters, the structural basis of disease-causing Kelch domain mutations in cblX, the mechanism of HCF-1 Golgi sequestration in neurons, and whether the splicing function of HCF-1 is physiologically significant.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of the full-length HCF-1 or Kelch domain with disease mutations","Splicing role described by a single lab and not replicated","In vivo significance of Golgi sequestration mechanism not established beyond neurons"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,11,12,13,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,10,29]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,1,5]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[6,12]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14,15,26,30]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[26]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,11,12,13,29,32]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,4,5,20,33]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,5,29]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,3,7,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[11,35]}],"complexes":["Set1/MLL H3K4 methyltransferase complex","Sin3-HDAC complex","BAP1/ASXL1 (PR-DUB) complex","VP16-induced complex (VIC)"],"partners":["OGT","BAP1","THAP11","ZNF143","E2F1","ASXL1","HSP90AA1","SIRT1"],"other_free_text":[]},"mechanistic_narrative":"HCFC1 (HCF-1) is a large chromatin-associated transcriptional co-regulator that scaffolds opposing histone-modifying complexes to control cell proliferation, cytokinesis, and metabolic gene expression. The HCF-1N subunit, generated by OGT-mediated proteolytic cleavage at HCF-1PRO repeats within the OGT active site, uses its Kelch/β-propeller domain to tether Set1/MLL H3K4 methyltransferase and Sin3-HDAC complexes to sequence-specific transcription factors — including E2F1, THAP11, ZNF143, and VP16 — at thousands of CpG-island promoters, thereby driving G1-to-S progression and context-dependent gene activation or repression [PMID:12670868, PMID:17612494, PMID:23539139]. The HCF-1C subunit ensures proper cytokinesis by regulating PR-Set7 expression and mitotic H4-K20 methylation, and the noncovalently associated subunits are held together by interdigitated Fn3 self-association sequences that also recruit the nuclear localization signal [PMID:12743030, PMID:15200950, PMID:23045687]. Missense mutations in the HCFC1 Kelch domain cause the X-linked cblX disorder through transcriptional failure at the MMACHC promoter, and HCFC1/THAP11 mutations additionally impair ribosome biogenesis gene expression [PMID:24011988, PMID:35013307]."},"prefetch_data":{"uniprot":{"accession":"P51610","full_name":"Host cell factor 1","aliases":["C1 factor","CFF","VCAF","VP16 accessory protein"],"length_aa":2035,"mass_kda":208.7,"function":"Transcriptional coregulator (By similarity). Serves as a scaffold protein, bridging interactions between transcription factors, including THAP11 and ZNF143, and transcriptional coregulators (PubMed:26416877). Involved in control of the cell cycle (PubMed:10629049, PubMed:10779346, PubMed:15190068, PubMed:16624878, PubMed:23629655). Also antagonizes transactivation by ZBTB17 and GABP2; represses ZBTB17 activation of the p15(INK4b) promoter and inhibits its ability to recruit p300 (PubMed:10675337, PubMed:12244100). Coactivator for EGR2 and GABP2 (PubMed:12244100, PubMed:14532282). Tethers the chromatin modifying Set1/Ash2 histone H3 'Lys-4' methyltransferase (H3K4me) and Sin3 histone deacetylase (HDAC) complexes (involved in the activation and repression of transcription, respectively) together (PubMed:12670868). Component of a THAP1/THAP3-HCFC1-OGT complex that is required for the regulation of the transcriptional activity of RRM1 (PubMed:20200153). As part of the NSL complex it may be involved in acetylation of nucleosomal histone H4 on several lysine residues (PubMed:20018852). Recruits KMT2E/MLL5 to E2F1 responsive promoters promoting transcriptional activation and thereby facilitates G1 to S phase transition (PubMed:23629655). Modulates expression of homeobox protein PDX1, perhaps acting in concert with transcription factor E2F1, thereby regulating pancreatic beta-cell growth and glucose-stimulated insulin secretion (By similarity). May negatively modulate transcriptional activity of FOXO3 (By similarity) (Microbial infection) In case of human herpes simplex virus (HSV) infection, HCFC1 forms a multiprotein-DNA complex with the viral transactivator protein VP16 and POU2F1 thereby enabling the transcription of the viral immediate early genes","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P51610/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/HCFC1","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ATG13","stoichiometry":0.2},{"gene":"CBX1","stoichiometry":0.2},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"CSNK2B","stoichiometry":0.2},{"gene":"EMC9","stoichiometry":0.2},{"gene":"FKBP5","stoichiometry":0.2},{"gene":"H2AFZ","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"HMGA1","stoichiometry":0.2},{"gene":"NCAPH","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HCFC1","total_profiled":1310},"omim":[{"mim_id":"621243","title":"TRANSCRIPTION ACTIVATION SUPPRESSOR FAMILY, MEMBER 2; TASOR2","url":"https://www.omim.org/entry/621243"},{"mim_id":"620940","title":"METHYLMALONIC ACIDURIA AND HOMOCYSTINURIA, cblL TYPE; MAHCL","url":"https://www.omim.org/entry/620940"},{"mim_id":"618818","title":"HOST CELL FACTOR C1 REGULATOR 1; HCFC1R1","url":"https://www.omim.org/entry/618818"},{"mim_id":"617109","title":"CREB3 RECRUITMENT FACTOR; CREBRF","url":"https://www.omim.org/entry/617109"},{"mim_id":"615488","title":"KAT8 REGULATORY NSL COMPLEX, SUBUNIT 2; KANSL2","url":"https://www.omim.org/entry/615488"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HCFC1"},"hgnc":{"alias_symbol":["HCF-1","HCF1","CFF","VCAF","MGC70925","PPP1R89"],"prev_symbol":["HFC1","MRX3"]},"alphafold":{"accession":"P51610","domains":[{"cath_id":"2.120.10.80","chopping":"19-279_289-363","consensus_level":"medium","plddt":91.3089,"start":19,"end":363},{"cath_id":"2.60.40.10","chopping":"364-403_1811-1833_1851-1888","consensus_level":"medium","plddt":91.038,"start":364,"end":1888},{"cath_id":"2.60.40.10","chopping":"1896-1933_1947-2000","consensus_level":"high","plddt":86.1564,"start":1896,"end":2000}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51610","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51610-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51610-F1-predicted_aligned_error_v6.png","plddt_mean":46.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HCFC1","jax_strain_url":"https://www.jax.org/strain/search?query=HCFC1"},"sequence":{"accession":"P51610","fasta_url":"https://rest.uniprot.org/uniprotkb/P51610.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51610/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51610"}},"corpus_meta":[{"pmid":"12670868","id":"PMC_12670868","title":"Human 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HCF-1 tethers these two complexes together, and the transcriptional activator VP16 selectively binds HCF-1 associated with the Set1/Ash2 HMT complex in the absence of the Sin3 HDAC complex.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, in vitro binding assays, histone methyltransferase activity assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and biochemical activity assays with multiple orthogonal methods in a highly-cited foundational paper\",\n      \"pmids\": [\"12670868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HCF-1 associates with both activator (E2F1, E2F3a) and repressor (E2F4) E2F proteins in a cell-cycle-selective manner; during the G1-to-S phase transition, HCF-1 recruits MLL and Set-1 histone H3K4 methyltransferases to E2F-responsive promoters, inducing histone methylation and transcriptional activation.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assays, cell-cycle synchronization\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, ChIP, reporter) in a highly-cited paper\",\n      \"pmids\": [\"17612494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"O-GlcNAc transferase (OGT) both O-GlcNAcylates the HCF-1N subunit and directly cleaves HCF-1 at the HCF-1PRO repeat sequences, mediating the proteolytic maturation of HCF-1 into HCF-1N and HCF-1C subunits; replacement of the HCF-1PRO repeats by a heterologous cleavage signal permits proteolysis but fails to activate HCF-1C M-phase functions.\",\n      \"method\": \"In vitro cleavage assays, mutagenesis of HCF-1PRO repeats, mass spectrometry, siRNA knockdown, cell-cycle phenotype analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution and mutagenesis with functional validation; replicated in subsequent structural paper\",\n      \"pmids\": [\"21295698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The tetratricopeptide-repeat (TPR) domain of OGT binds the C-terminal portion of an HCF-1 proteolytic repeat such that the cleavage region lies in the glycosyltransferase active site; cleavage occurs between cysteine and glutamate residues producing a pyroglutamate product; converting the cleavage-site glutamate to serine converts the proteolytic repeat into a glycosylation substrate.\",\n      \"method\": \"Crystal structure of OGT:HCF-1PRO complex, mutagenesis, in vitro cleavage and glycosylation assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis and in vitro biochemical validation\",\n      \"pmids\": [\"24311690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Proteolytic processing of HCF-1 is necessary to separate two distinct cell-cycle functions: the HCF-1N subunit promotes G1-phase progression, while the HCF-1C subunit is required for proper cytokinesis/exit from mitosis.\",\n      \"method\": \"siRNA knockdown of HCF-1 in multiple cell lines, expression of separate HCF-1N and HCF-1C subunits, cell-cycle phenotype analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined cellular phenotype and subunit rescue experiments\",\n      \"pmids\": [\"12743030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HCF-1C subunit depletion causes a switch from monomethyl to dimethyl lysine 20 of histone H4 (H4-K20) during mitosis and leads to defective chromosome alignment and segregation; HCF-1C regulates expression of the H4-K20 methyltransferase PR-Set7, and upregulation of PR-Set7 upon HCF-1 loss causes improper mitotic H4-K20 methylation and cytokinesis defects.\",\n      \"method\": \"siRNA knockdown, chromatin fractionation, quantitative ChIP, immunofluorescence, western blot\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing pathway position and histone modification mechanism\",\n      \"pmids\": [\"15200950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HCF-1 is naturally bound to chromatin in uninfected cells through its VP16-interaction domain; a proline-to-serine mutation in tsBN67 cells causes temperature-sensitive dissociation of HCF-1 from chromatin prior to cell proliferation arrest, establishing chromatin association as essential for HCF-1's role in cell proliferation.\",\n      \"method\": \"Chromatin fractionation, temperature-shift experiments, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct fractionation with functional consequence established by genetic mutation\",\n      \"pmids\": [\"11340173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"BAP1 deubiquitinase interacts with HCF-1 via its HCF-1 binding motif and deubiquitinates Lys-48-linked polyubiquitin chains on the HCF-1N Kelch domain; this interaction is required for BAP1-mediated regulation of cell proliferation.\",\n      \"method\": \"Mass spectrometry of co-purified proteins, co-immunoprecipitation, ubiquitination assays, RNAi, dominant-negative mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing PTM writer/eraser relationship and functional consequence\",\n      \"pmids\": [\"19815555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"C. elegans HCF-1 physically associates with DAF-16/FOXO and limits DAF-16 recruitment to target gene promoters; loss of hcf-1 results in daf-16-dependent lifespan extension of up to 40% and altered expression of DAF-16-regulated genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, genetic epistasis (double mutants), lifespan assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis combined with physical interaction and ChIP data in a well-cited paper\",\n      \"pmids\": [\"18828672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In C. elegans, HCF-1 acts downstream of SIR-2.1 to regulate DAF-16/FOXO target gene expression; SIR-2.1/SIRT1 and HCF-1 form protein complexes in both worms and mammalian cells; mammalian HCF-1 represses FOXO/SIRT1 target genes analogously.\",\n      \"method\": \"Genetic epistasis, gene expression profiling, co-immunoprecipitation in C. elegans and mammalian cells\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis with reciprocal co-IP and gene expression profiling across two organisms\",\n      \"pmids\": [\"21909281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"THAP1 associates with HCF-1 via a consensus HCF-1 binding motif (HBM) in vitro and in vivo, and endogenous THAP1 mediates recruitment of HCF-1 to the RRM1 promoter during endothelial cell proliferation; HCF-1 is essential for THAP1-dependent transcriptional activation of RRM1.\",\n      \"method\": \"Proteomic analysis, co-immunoprecipitation, in vitro binding, ChIP, RNAi\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods demonstrating physical interaction and functional consequence at a specific promoter\",\n      \"pmids\": [\"20200153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HCFC1 binds to consensus sites in the MMACHC promoter and is required for transcriptional regulation of MMACHC; siRNA-mediated knockdown of HCFC1 results in coordinate downregulation of MMACHC mRNA, and missense mutations in the HCFC1 kelch domain in cblX patients cause severe reduction of MMACHC mRNA and protein.\",\n      \"method\": \"Exome sequencing, ChIP (consensus binding sites), siRNA knockdown, RT-PCR, western blot\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods (ChIP, knockdown, patient fibroblasts) converging on a specific transcriptional target\",\n      \"pmids\": [\"24011988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In HeLa cells, HCFC1 is bound to ~5,400 active CpG-island promoters and co-localizes with ZNF143, THAP11 (Ronin), GABP, and YY1 transcription factors at ~90% of HCFC1-bound promoters, establishing HCFC1 as a broadly acting transcriptional scaffold.\",\n      \"method\": \"ChIP-seq, motif analysis, co-localization analysis\",\n      \"journal\": \"Genome research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP-seq establishing chromatin occupancy at scale\",\n      \"pmids\": [\"23539139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ronin (THAP11) binds with HCF-1 to a highly conserved enhancer element and together regulate genes involved in transcription initiation, mRNA splicing, and cell metabolism to support ES cell self-renewal; Ronin/HCF-1 both represses and activates target genes.\",\n      \"method\": \"ChIP-seq, co-immunoprecipitation, gene expression profiling, loss-of-function\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide ChIP combined with physical interaction data and functional analysis\",\n      \"pmids\": [\"20581084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HCF-1 contains two matched pairs of self-association sequences (SAS1 and SAS2); SAS1 consists of a 43-amino-acid HCF-1N region that associates with a tandem pair of fibronectin type 3 (Fn3) repeats in the HCF-1C subunit; HCF-1C contains a nuclear localization signal that recruits HCF-1N subunits to the nucleus.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutagenesis, subcellular localization assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic mutagenesis with co-IP defining structural requirements for subunit association\",\n      \"pmids\": [\"10958670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The SAS1 self-association elements from HCF-1N and HCF-1C subunits form an interdigitated fibronectin type 3 (Fn3) tandem repeat structure; the C-terminal NLS recruited by this interdigitated SAS1 structure is required for effective formation of the HSV VP16-induced transcriptional regulatory complex.\",\n      \"method\": \"Crystal structure of SAS1, mutagenesis, VP16-induced complex formation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional mutagenesis validation\",\n      \"pmids\": [\"23045687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"OGT-mediated glycosylation and HCF-1 proteolysis occur through separable mechanisms within the same active site; a specific TPR domain contact with HCF-1 is critical for proteolysis but not Ser/Thr glycosylation; key catalytic residues and UDP-GlcNAc oxygen required for glycosylation are dispensable for proteolysis.\",\n      \"method\": \"Mutagenesis of OGT catalytic and TPR domains, in vitro glycosylation and cleavage assays, engineered single-activity OGT enzymes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic in vitro mutagenesis and reconstitution distinguishing two enzymatic mechanisms\",\n      \"pmids\": [\"27056667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The HCF-1PRO repeat contains distinct OGT-binding sites: the cleavage-site glutamate inhibits OGT/UDP-GlcNAc association, while a novel OGT-binding sequence near the first HCF-1PRO-repeat cleavage signal enhances cleavage.\",\n      \"method\": \"In vitro OGT binding and cleavage assays, mutagenesis, mass spectrometry\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis mapping distinct binding determinants\",\n      \"pmids\": [\"26305326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The HCF-1 processing/PRO domain interacts with the transcriptional coactivator/corepressor FHL2; this interaction is specific to the non-processed (uncleavaged) HCF-1 and costimulates transcription of an HCF-1-dependent target gene, establishing that site-specific proteolysis of HCF-1 regulates its interaction with protein cofactors.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, mutational analysis of PRO repeats\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with functional reporter assays; single lab\",\n      \"pmids\": [\"16624878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The C-terminal WYF domain of HCF-1 interacts with the MYND domain of PDCD2; overexpression of PDCD2 suppresses HCF-1 complementation of the tsBN67 temperature-sensitive proliferation defect, identifying PDCD2 as a negative regulator of HCF-1.\",\n      \"method\": \"Co-immunoprecipitation, complementation assay in tsBN67 cells, overexpression of dominant-interfering domains\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP with functional complementation assay; single lab\",\n      \"pmids\": [\"12149646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Inactivation of pRb family members (pRb, p107, p130) by SV40 large T antigen or adenovirus E1A rescues both the cell proliferation and cytokinesis defects of HCF-1-deficient tsBN67 cells without restoring HCF-1 chromatin association, placing HCF-1 upstream of or in opposition to pRb family function in cell cycle control.\",\n      \"method\": \"Genetic rescue (oncoprotein expression), temperature-shift experiments, chromatin fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via rescue experiment; single lab\",\n      \"pmids\": [\"12215534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HCF-1 is required for spliceosome assembly and pre-mRNA splicing; it interacts with complexes containing U1 and U5 splicing snRNPs in uninfected cells; the tsBN67 missense mutation disrupts these interactions at non-permissive temperature and causes inefficient spliceosome assembly.\",\n      \"method\": \"Co-immunoprecipitation with snRNPs, in vitro splicing assays in nuclear extracts, rescue by wild-type HCF-1 expression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro assay with rescue experiment; single lab\",\n      \"pmids\": [\"12456665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HCF-1 localizes to HSV-1 DNA replication sites late in infection; HCF-1 interacts directly and simultaneously with both HSV DNA replication proteins and the cellular histone chaperone Asf1b; depletion of Asf1b results in significantly reduced viral DNA accumulation.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization to viral replication foci, siRNA depletion with viral DNA quantification\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct interaction and localization with functional consequence; single lab\",\n      \"pmids\": [\"20133788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"E2F1 associates with HCF-1 through a short DHQY sequence; this interaction enables E2F1 to stimulate both DNA damage and apoptosis; HCF-1 and the MLL family of H3K4 methyltransferases have important functions in E2F1-induced apoptosis; sequence changes in the E2F1 HCF-1-binding site modulate E2F1-induced apoptosis up and down.\",\n      \"method\": \"Mutagenesis of E2F1 HCF-1-binding motif, co-immunoprecipitation, apoptosis and DNA damage assays, siRNA knockdown\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with functional phenotype; single lab\",\n      \"pmids\": [\"19763085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The HCF-binding motif (HBM) in Krox20 and E2F4 mediates association with the HCF-1 beta-propeller (Kelch) domain; Krox20 requires a functional HBM for both transactivation and HCF-1 association; the HCF-1C activation domain contributes to activation by Krox20, possibly through recruitment of p300.\",\n      \"method\": \"Co-immunoprecipitation, mutagenesis of HBM, reporter assays, pulldown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with co-IP and reporter assays; single lab\",\n      \"pmids\": [\"14532282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HCF-1 contains an activation domain (HCF-1AD) in its C-terminal subunit required for maximal transactivation by VP16 and LZIP; co-expression of p300 augments HCF-1AD activity; cells lacking the HCF-1AD show reduced HSV immediate-early gene expression and lower viral titers.\",\n      \"method\": \"Reporter assays, mutagenesis, HSV infection with titer measurement\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis with functional viral and reporter assays; single lab\",\n      \"pmids\": [\"12271126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In sensory neurons, HCF-1 is specifically sequestered at the Golgi apparatus (not the ER); disruption of the Golgi causes rapid relocalization of HCF-1 to the nucleus, correlating with a regulatory mechanism for HSV reactivation.\",\n      \"method\": \"Immunofluorescence, organelle co-localization, Golgi disruption experiments in primary neuronal cultures\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence for viral reactivation; single lab\",\n      \"pmids\": [\"18667495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The nuclear export factor HPIP contains a functional HCF-binding motif that interacts with the HCF-1 beta-propeller domain; HPIP shuttles between nucleus and cytoplasm in a CRM1-dependent manner, and its overexpression leads to accumulation of HCF-1 in the cytoplasm.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization assays, CRM1 inhibitor treatment, overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with localization phenotype; single lab\",\n      \"pmids\": [\"12235138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Loss of C. elegans HCF-1 leads to reduced levels of phospho-histone H3 serine 10 (H3S10P) in viable embryos; mammalian cells with defective HCF-1 also display mitotic H3S10P defects, suggesting a conserved role for HCF-1 in regulating mitotic histone phosphorylation.\",\n      \"method\": \"Genetic deletion in C. elegans, immunofluorescence, temperature-shift experiments in mammalian cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined histone modification phenotype in two organisms; single lab\",\n      \"pmids\": [\"18043729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HCF-1 is O-GlcNAcylated in response to glucose as a prerequisite for its binding to ChREBP; HCF-1 then recruits OGT to O-GlcNAcylate ChREBP and promote its activation; the HCF-1:ChREBP complex at lipogenic gene promoters regulates H3K4 trimethylation and recruits the histone demethylase PHF2 for epigenetic activation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, O-GlcNAcylation assays, glucose-stimulation experiments, genetic knockdown\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal biochemical and genetic methods establishing a nutrient-responsive mechanism\",\n      \"pmids\": [\"31227231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HSP90 maintains the stability of HCFC1 protein in the nucleus; HSP90 inhibition leads to loss of HCFC1 and reduced expression of HCFC1-targeted cell-cycle genes.\",\n      \"method\": \"Systematic nuclear HSP90 interactome analysis (three orthogonal methods), biochemical stability assays, gene expression analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — three independent interactome methods identifying HSP90 as HCFC1 stability factor; single lab\",\n      \"pmids\": [\"31693902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"THAP11 associates physically with HCF-1 and recruits it to target promoters; THAP11-mediated gene regulation and chromatin association require HCF-1, while HCF-1 recruitment at THAP11 target genes requires THAP11, establishing mutual dependence.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, gene expression profiling\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods; single lab\",\n      \"pmids\": [\"22371484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The ACTACA submotif shared by THAP11 and ZNF143 directs recruitment of THAP11 and HCFC1 to ZNF143-occupied loci; CRISPR-Cas9-mediated alteration of the ACTACA submotif at endogenous promoters alters gene transcription and histone modifications, establishing the DNA sequence basis for THAP11/ZNF143/HCFC1 complex chromatin recruitment.\",\n      \"method\": \"CRISPR-Cas9 mutagenesis, chromosomally integrated synthetic constructs, ChIP, gene expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — CRISPR editing at endogenous loci combined with chromatin and transcriptional readouts; single lab\",\n      \"pmids\": [\"26416877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HCF-1 activates CDC42 expression by binding to the -881 to -575 region upstream of the CDC42 transcription start site; overexpression of constitutively active CDC42F28L rescues G1-phase delay and multinucleate mitotic defects caused by HCF-1 loss.\",\n      \"method\": \"ChIP, promoter reporter assays, siRNA knockdown, rescue by CDC42 overexpression\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with promoter deletion and genetic rescue; single lab\",\n      \"pmids\": [\"33097698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SETD5 regulates RNA polymerase II pausing and release at E2F target gene promoters in hematopoietic stem cells in cooperation with HCF-1 and the PAF1 complex; SETD5 and HCF-1 co-occupy E2F target promoters.\",\n      \"method\": \"ChIP-seq, co-immunoprecipitation, conditional knockout, transcriptome analysis\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq and co-IP with in vivo knockout; single lab\",\n      \"pmids\": [\"34853439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HCFC1 and RONIN (THAP11) jointly regulate MMACHC expression and also regulate genes encoding ribosome protein subunits; mouse models of Hcfc1/Ronin mutations show reduced expression of ribosome biogenesis genes and phenotypes consistent with ribosomopathy in addition to cblC-like metabolic defects.\",\n      \"method\": \"Mouse genetic models, transcriptome analysis, metabolic phenotyping\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo mouse models with transcriptome profiling establishing pathway; peer-reviewed\",\n      \"pmids\": [\"35013307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The conserved threonine-rich region of the HCF-1PRO repeat is tightly bound by the OGT TPR region and activates both OGT glycosylation and proteolysis activities; linkage of this region to heterologous sequences potentiates both Ser glycosylation and cleavage of non-HCF-1PRO sequences containing an appropriately positioned glutamate.\",\n      \"method\": \"In vitro glycosylation assays with co-substrate analogs, domain-swap mutagenesis, mass spectrometry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with systematic mutagenesis and multiple substrate analogs\",\n      \"pmids\": [\"30224358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"KDM2A (lysine demethylase targeting H3K36me3) recruits HCF-1 and E2F1 to promoters of meiosis-entry genes (Stra8, Meiosin, Spo11, Sycp1) in male germ cells; KDM2A deficiency disrupts H3K36me2/3 deposition and impairs meiotic entry.\",\n      \"method\": \"Conditional knockout, ChIP, co-immunoprecipitation, spermatogenesis phenotype analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP, ChIP and in vivo knockout with defined phenotype; single lab\",\n      \"pmids\": [\"39160277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, SET-26 recruits HCF-1 to chromatin (HCF-1 localization is largely dependent on functional SET-26), and together they antagonize the histone deacetylase HDA-1 to regulate longevity and gene expression; HDA-1 opposes SET-26 and HCF-1 at a subset of common target gene promoters.\",\n      \"method\": \"Genetic epistasis, ChIP, transcriptome analysis, lifespan assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with ChIP establishing recruitment dependency; single lab\",\n      \"pmids\": [\"38485937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Hepatocyte-specific deletion of HCF-1 causes progressive loss of OGT protein levels and global O-GlcNAcylation without altering OGT mRNA, indicating post-translational regulation of OGT by HCF-1; HCF-1 loss results in reduced nuclear OGT and O-GlcNAcylation, mimicking fasting conditions.\",\n      \"method\": \"Conditional knockout mouse model, immunofluorescence, western blot, RT-qPCR, histology\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional knockout with multiple readouts; single lab\",\n      \"pmids\": [\"40754593\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HCF-1 binds to the C-terminal ~200 amino acids of ASXL1 and promotes ASXL1 turnover in a proteasome-dependent manner; HCF-1 and BAP1 show reciprocal antagonism in association with ASXL1, and deletion of the HCF-1-binding region stabilizes ASXL1.\",\n      \"method\": \"P2A dual-reporter stability assay, co-immunoprecipitation, proteasome inhibition, domain deletion mutagenesis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical methods establishing regulatory interaction; single lab\",\n      \"pmids\": [\"41968849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HCF1 and OCT2 bind cooperatively with EBNA1 at the Epstein-Barr virus OriP; HCF1 depletion leads to loss of H3K4me3 and H3 acetylation at EBV latency promoters and gain of H3K9me3, and results in loss of EBV episomes and viral reactivation.\",\n      \"method\": \"ChIP, co-immunoprecipitation, siRNA knockdown, episome quantification\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple ChIP and knockdown methods; single lab\",\n      \"pmids\": [\"27009953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HCF-1 is required for INS-1 pancreatic β-cell glucose-stimulated insulin secretion; HCF-1 and E2F1 co-localize to the Pdx1 promoter by ChIP, and HCF-1 loss reduces Pdx1 expression.\",\n      \"method\": \"siRNA knockdown, glucose-stimulated insulin secretion assay, ChIP\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with functional assay; single lab\",\n      \"pmids\": [\"24250814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HSP90 inhibition reduces TFEB transcription by decreasing HSP90AA1-HCFC1 interaction, which prevents HCFC1 from binding to the TFEB proximal promoter region, leading to reduced LC3 and increased mitochondria-derived vesicle formation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, western blot, siRNA knockdown\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP and ChIP establishing mechanistic link; single lab\",\n      \"pmids\": [\"39461872\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HCFC1 (HCF-1) is a large chromatin-associated transcriptional co-regulator that undergoes proteolytic maturation by O-GlcNAc transferase (OGT), which cleaves the HCF-1PRO repeats within its own active site to generate noncovalently associated HCF-1N and HCF-1C subunits; HCF-1N promotes G1-phase progression by tethering histone H3K4 methyltransferase (Set1/Ash2, MLL) and Sin3-HDAC complexes to sequence-specific transcription factors (E2F1, THAP11, ZNF143, VP16, and others) via its Kelch/beta-propeller domain, while HCF-1C ensures proper cytokinesis by regulating PR-Set7 expression and mitotic histone H4-K20 methylation; HCF-1 is also O-GlcNAcylated by OGT in a nutrient-responsive manner to couple glucose signals to ChREBP-driven lipogenic gene activation, and in sensory neurons its cytoplasmic sequestration at the Golgi apparatus controls its nuclear availability for HSV reactivation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HCFC1 (HCF-1) is a large chromatin-associated transcriptional co-regulator that scaffolds opposing histone-modifying complexes to control cell proliferation, cytokinesis, and metabolic gene expression. The HCF-1N subunit, generated by OGT-mediated proteolytic cleavage at HCF-1PRO repeats within the OGT active site, uses its Kelch/β-propeller domain to tether Set1/MLL H3K4 methyltransferase and Sin3-HDAC complexes to sequence-specific transcription factors — including E2F1, THAP11, ZNF143, and VP16 — at thousands of CpG-island promoters, thereby driving G1-to-S progression and context-dependent gene activation or repression [PMID:12670868, PMID:17612494, PMID:23539139]. The HCF-1C subunit ensures proper cytokinesis by regulating PR-Set7 expression and mitotic H4-K20 methylation, and the noncovalently associated subunits are held together by interdigitated Fn3 self-association sequences that also recruit the nuclear localization signal [PMID:12743030, PMID:15200950, PMID:23045687]. Missense mutations in the HCFC1 Kelch domain cause the X-linked cblX disorder through transcriptional failure at the MMACHC promoter, and HCFC1/THAP11 mutations additionally impair ribosome biogenesis gene expression [PMID:24011988, PMID:35013307].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Defining how HCF-1N and HCF-1C subunits remain associated and reach the nucleus resolved the basic architecture of the processed heterodimer: matched self-association sequences (SAS1/SAS2) mediate inter-subunit binding, and the HCF-1C NLS drives nuclear import of both subunits.\",\n      \"evidence\": \"Co-immunoprecipitation and deletion mutagenesis with subcellular localization assays\",\n      \"pmids\": [\"10958670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SAS interactions unknown at this point\", \"Whether SAS mutations affect endogenous HCF-1 function in vivo not tested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrating that HCF-1 is constitutively chromatin-bound in uninfected cells — and that loss of chromatin association precedes the tsBN67 proliferation arrest — established chromatin association as essential for HCF-1's proliferative function, independent of any viral context.\",\n      \"evidence\": \"Chromatin fractionation and temperature-shift experiments in tsBN67 cells\",\n      \"pmids\": [\"11340173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of chromatin targets unknown\", \"Mechanism of chromatin recruitment unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Epistasis experiments placing HCF-1 upstream of pRb family function, identification of the HCF-1C activation domain required for VP16/LZIP-mediated transcription, discovery of HPIP as a nuclear-export factor for HCF-1, involvement of HCF-1 in spliceosome assembly, and identification of PDCD2 as a negative regulator collectively defined HCF-1 as a multifunctional nuclear regulator with roles beyond viral transactivation.\",\n      \"evidence\": \"Genetic rescue by pRb-inactivating oncoproteins, reporter assays with HCF-1AD mutants, HSV infection assays, co-IP with snRNPs, in vitro splicing, co-IP with PDCD2 and HPIP\",\n      \"pmids\": [\"12215534\", \"12271126\", \"12456665\", \"12235138\", \"12149646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Splicing role not confirmed by independent labs\", \"Whether HPIP-mediated cytoplasmic relocalization is physiologically regulated unknown\", \"Direct pRb interaction not demonstrated\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Two foundational discoveries established that HCF-1 proteolytic processing separates distinct cell-cycle functions (HCF-1N for G1 progression, HCF-1C for cytokinesis) and that HCF-1 scaffolds antagonistic chromatin-modifying complexes (Set1/Ash2 HMT and Sin3 HDAC) on the same molecule, with VP16 selectively engaging the HMT-associated form.\",\n      \"evidence\": \"siRNA knockdown with subunit rescue, co-IP/mass spectrometry with histone methyltransferase activity assays\",\n      \"pmids\": [\"12743030\", \"12670868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How selectivity between HMT and HDAC complexes is achieved at specific promoters unknown\", \"Identity of endogenous transcription factors directing complex selection unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"HCF-1C was shown to control mitotic H4-K20 methylation by regulating PR-Set7 expression, explaining the cytokinesis defect: HCF-1 loss upregulates PR-Set7, causing aberrant dimethylation of H4-K20 and defective chromosome segregation.\",\n      \"evidence\": \"siRNA knockdown, quantitative ChIP, chromatin fractionation, immunofluorescence\",\n      \"pmids\": [\"15200950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional mechanism by which HCF-1C represses PR-Set7 not established\", \"Whether other H4-K20 methyltransferases are involved not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linking HCF-1 to cell-cycle-regulated E2F proteins resolved how HCF-1 activates endogenous G1/S gene expression: HCF-1 associates selectively with activator E2Fs during G1-to-S transition and recruits MLL/Set1 to E2F-responsive promoters for H3K4 methylation.\",\n      \"evidence\": \"Co-IP, ChIP, reporter assays with cell-cycle synchronization\",\n      \"pmids\": [\"17612494\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HCF-1 switches from repressor E2F4 to activator E2F1 complexes not mechanistically resolved\", \"Whether HCF-1-E2F interaction is direct or bridged unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Two parallel advances expanded HCF-1 biology: in C. elegans, HCF-1 was found to physically restrain DAF-16/FOXO at target promoters such that hcf-1 loss extends lifespan; in sensory neurons, HCF-1 was found sequestered at the Golgi apparatus, with Golgi disruption releasing it to the nucleus — a mechanism controlling HSV reactivation.\",\n      \"evidence\": \"Co-IP and ChIP with genetic epistasis and lifespan assays (C. elegans); immunofluorescence and Golgi disruption in primary neurons\",\n      \"pmids\": [\"18828672\", \"18667495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of Golgi tethering unknown\", \"Whether mammalian FOXO factors are similarly regulated by HCF-1 in longevity not demonstrated in vivo\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"BAP1 deubiquitinase was identified as removing K48-linked polyubiquitin from the HCF-1N Kelch domain, linking HCF-1 to tumor-suppressor pathways; separately, the E2F1–HCF-1 interaction was shown to channel E2F1 activity toward apoptosis via MLL recruitment.\",\n      \"evidence\": \"Mass spectrometry, ubiquitination assays, co-IP (BAP1); mutagenesis of E2F1 HBM with apoptosis assays\",\n      \"pmids\": [\"19815555\", \"19763085\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether BAP1-mediated deubiquitination stabilizes HCF-1 or alters its interactions not fully resolved\", \"Mechanism distinguishing E2F1 apoptotic versus proliferative outputs unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genome-wide studies with THAP11 (Ronin) and THAP1 established HCF-1 as a broadly acting transcriptional scaffold recruited by zinc-finger/THAP-domain proteins to regulate ES cell self-renewal and endothelial proliferation genes.\",\n      \"evidence\": \"ChIP-seq, co-IP, gene expression profiling, RNAi in ES cells and endothelial cells\",\n      \"pmids\": [\"20581084\", \"20200153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether THAP11 and THAP1 compete or cooperate for HCF-1 at shared targets unclear\", \"Structural basis of THAP–HCF-1 interaction not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The discovery that OGT both O-GlcNAcylates HCF-1N and proteolytically cleaves HCF-1PRO repeats within its own active site fundamentally redefined HCF-1 maturation as an OGT-dependent process, linking nutrient sensing to HCF-1 function.\",\n      \"evidence\": \"In vitro cleavage assays, mutagenesis, mass spectrometry, siRNA, cell-cycle analysis\",\n      \"pmids\": [\"21295698\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How proteolysis is temporally regulated in vivo unknown\", \"Whether all six PRO repeats are cleaved equivalently not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Multiple advances converged: the crystal structure of OGT bound to HCF-1PRO revealed the cleavage mechanism (pyroglutamate product); ChIP-seq in HeLa cells showed HCFC1 at ~5,400 CpG-island promoters with ZNF143/THAP11/GABP/YY1; and missense HCFC1 Kelch-domain mutations were identified as the cause of X-linked cblX disorder through transcriptional failure at the MMACHC promoter.\",\n      \"evidence\": \"Crystal structure with mutagenesis (OGT); ChIP-seq (HeLa); exome sequencing, ChIP, siRNA in patient fibroblasts (cblX)\",\n      \"pmids\": [\"24311690\", \"23539139\", \"24011988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all ~5,400 bound promoters are functionally regulated by HCF-1 unknown\", \"Structural basis for Kelch domain mutations causing cblX not resolved\", \"Full spectrum of cblX-affected target genes beyond MMACHC not catalogued\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The ACTACA DNA motif shared by THAP11 and ZNF143 was shown to direct HCFC1 recruitment to chromatin via CRISPR mutagenesis of endogenous promoters, establishing the cis-regulatory basis for the THAP11/ZNF143/HCFC1 module.\",\n      \"evidence\": \"CRISPR-Cas9 editing of endogenous promoters, ChIP, gene expression analysis\",\n      \"pmids\": [\"26416877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other DNA motifs recruit HCFC1 independently of THAP11/ZNF143 not tested\", \"Role of GABP and YY1 in HCFC1 recruitment not mechanistically distinguished\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Separation-of-function OGT mutants demonstrated that HCF-1 proteolysis and O-GlcNAc glycosylation use overlapping but mechanistically separable catalytic routes within the same OGT active site, with a specific TPR contact required only for cleavage.\",\n      \"evidence\": \"Systematic mutagenesis of OGT catalytic and TPR domains with in vitro glycosylation and cleavage assays\",\n      \"pmids\": [\"27056667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo consequences of selectively ablating OGT cleavage versus glycosylation not tested\", \"Whether other OGT substrates compete with HCF-1 for cleavage unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"HCF-1 was shown to couple glucose sensing to lipogenic gene expression: glucose-stimulated O-GlcNAcylation of HCF-1 enables its binding to ChREBP, followed by OGT recruitment and ChREBP activation, with H3K4me3 and PHF2 demethylase activity at lipogenic promoters.\",\n      \"evidence\": \"Co-IP, ChIP, O-GlcNAcylation assays, glucose stimulation, genetic knockdown\",\n      \"pmids\": [\"31227231\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HCF-1 O-GlcNAcylation is reversible and dynamically regulated unknown\", \"Relative contribution of HCF-1 versus other ChREBP cofactors not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mouse models of Hcfc1/Ronin (Thap11) mutations revealed that the HCFC1–RONIN axis regulates not only MMACHC but also ribosome biogenesis genes, with mutant phenotypes consistent with ribosomopathy, broadening the disease mechanism beyond cobalamin metabolism.\",\n      \"evidence\": \"Mouse genetic models, transcriptome analysis, metabolic phenotyping\",\n      \"pmids\": [\"35013307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which ribosome protein genes are direct versus indirect targets not fully resolved\", \"Whether ribosomopathy phenotypes are independent of cobalamin deficiency not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Hepatocyte-specific HCF-1 deletion revealed that HCF-1 post-translationally stabilizes OGT protein and sustains global O-GlcNAcylation, establishing a reciprocal regulatory relationship between HCF-1 and OGT beyond the known OGT→HCF-1 direction.\",\n      \"evidence\": \"Conditional knockout mouse model, immunofluorescence, western blot, RT-qPCR\",\n      \"pmids\": [\"40754593\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of HCF-1-dependent OGT stabilization not determined\", \"Whether this relationship operates in non-hepatic tissues unknown\", \"Single lab, not independently confirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how HCF-1 selects between activating (MLL/Set1) and repressive (Sin3-HDAC) complexes at individual promoters, the structural basis of disease-causing Kelch domain mutations in cblX, the mechanism of HCF-1 Golgi sequestration in neurons, and whether the splicing function of HCF-1 is physiologically significant.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the full-length HCF-1 or Kelch domain with disease mutations\", \"Splicing role described by a single lab and not replicated\", \"In vivo significance of Golgi sequestration mechanism not established beyond neurons\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 11, 12, 13, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 10, 29]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [6, 12]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14, 15, 26, 30]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 11, 12, 13, 29, 32]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 4, 5, 20, 33]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 5, 29]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 3, 7, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [11, 35]}\n    ],\n    \"complexes\": [\n      \"Set1/MLL H3K4 methyltransferase complex\",\n      \"Sin3-HDAC complex\",\n      \"BAP1/ASXL1 (PR-DUB) complex\",\n      \"VP16-induced complex (VIC)\"\n    ],\n    \"partners\": [\n      \"OGT\",\n      \"BAP1\",\n      \"THAP11\",\n      \"ZNF143\",\n      \"E2F1\",\n      \"ASXL1\",\n      \"HSP90AA1\",\n      \"SIRT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}