{"gene":"SUB1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1996,"finding":"Yeast SUB1 was isolated as a suppressor of TFIIB mutations (E62G, R78H); SUB1 binds directly to TFIIB in vitro and specifically inhibits the formation of TBP-TFIIB-promoter complexes, suggesting a role in TFIIB release during transcription initiation.","method":"Genetic suppressor screen, in vitro binding assay (pulldown), in vivo transcriptional activation assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic suppressor screen combined with in vitro TFIIB-binding assay and in vivo transcriptional activation; multiple orthogonal methods in a single study, replicated genetically","pmids":["8617240"],"is_preprint":false},{"year":1999,"finding":"Allele-specific genetic interactions between ssu72 and sub1 with TFIIB (sua7) mutants demonstrate functional interactions among TFIIB, Ssu72, and Sub1 that influence the accuracy of transcription start site selection by RNA polymerase II.","method":"Error-prone PCR mutagenesis of TFIIB, genetic interaction analysis (synthetic lethality/suppression), allele-specificity tests","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with allele-specific interactions, single lab, multiple alleles tested","pmids":["10511545"],"is_preprint":false},{"year":2003,"finding":"Sub1 physically interacts with the Pta1 subunit of CPF (cleavage/polyadenylation factor), and overexpression of SUB1 suppresses growth and processing defects of a pta1 mutation; physical interactions of Ssu72 and Sub1 with Pta1 are mutually exclusive, linking transcription initiation and 3' end processing machineries.","method":"Biochemical co-purification, genetic suppression (overexpression of SUB1 rescuing pta1 mutant), in vitro cleavage assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal physical interaction combined with functional genetic rescue and in vitro cleavage assay; multiple orthogonal methods","pmids":["12704082"],"is_preprint":false},{"year":2005,"finding":"Sub1 and Rna15 (yeast CstF-64 homolog) are recruited to promoters and present along the length of several yeast genes; deletion of SUB1 causes decreased accumulation of Fcp1, altered RNAP II CTD phosphorylation, and decreased crosslinking of RNAP II to transcribed genes, indicating Sub1 facilitates elongation by influencing CTD-modifying enzymes.","method":"Chromatin immunoprecipitation (ChIP), allele-specific genetic interactions with KIN28 and FCP1, Western blot","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP across multiple genes combined with genetic interactions and biochemical analysis; multiple orthogonal methods in a single study","pmids":["15692559"],"is_preprint":false},{"year":2008,"finding":"Sub1 functions as a transcriptional repressor at the IMD2 gene in yeast: deletion of SUB1 increases IMD2 expression, and Sub1 localizes to the IMD2 promoter region; the upstream region of the transcription start site is required for Sub1-mediated repression.","method":"ChIP, gene expression analysis (RT-PCR/Northern), genetic interaction with dst1 (TFIIS)","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP localization combined with expression analysis and genetic interaction, single lab","pmids":["18823333"],"is_preprint":false},{"year":2009,"finding":"Sub1 is present at the promoter of every constitutively transcribed RNAP II and RNAP III gene tested (but not RNAP I), and deletion of SUB1 reduces promoter-associated RNAP II or III levels without reducing TBP levels, indicating Sub1 facilitates polymerase recruitment at both RNAP II and RNAP III genes.","method":"ChIP, synthetic genetic array screen (SGA), genetic interactions with HOG pathway genes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide ChIP combined with functional genetic screen and quantitative polymerase recruitment assays; multiple orthogonal methods","pmids":["19204085"],"is_preprint":false},{"year":2009,"finding":"Sub1 is present on Pol III-transcribed genes genome-wide, interacts with components of the Pol III transcription system, and stimulates the initiation and reinitiation steps in a system reconstituted with all recombinant factors; Sub1 is required for optimal Pol III gene transcription in exponentially growing cells.","method":"Genome-wide ChIP-chip, in vitro reconstituted transcription assay with recombinant factors, genetic analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with recombinant factors combined with genome-wide ChIP and genetic validation","pmids":["19706510"],"is_preprint":false},{"year":2010,"finding":"Sub1 globally regulates RNA polymerase II CTD phosphorylation: SUB1 deletion increased CTD phosphorylation by Kin28, Bur1, and Ctk1 but decreased it by Srb10; ChIP showed SUB1 deletion decreased Srb10 chromatin association but increased Kin28 and Ctk1 chromatin association on active genes.","method":"In vitro kinase assays, ChIP, genetic interactions with all four CTD kinase genes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assays combined with ChIP and genetic interactions with all four CTD kinases; multiple orthogonal methods in a single study","pmids":["20823273"],"is_preprint":false},{"year":2011,"finding":"Sub1 (homolog of mammalian coactivator PC4) is a component of RNA polymerase II preinitiation complexes (PICs); Sub1 localizes near the transcription bubble in vitro and binds to promoters in vivo dependent upon PIC assembly; Sub1 and RPA compete for a common ssDNA binding site (nontemplate strand), with RPA increasing at active promoters when Sub1 is deleted or its ssDNA-binding is mutated.","method":"Quantitative proteomic analysis of RNApII PICs (mass spectrometry), in vitro transcription bubble binding, ChIP, genetic interactions","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative proteomics of PICs, in vitro transcription bubble localization, ChIP, and genetic epistasis; multiple orthogonal methods","pmids":["22055186"],"is_preprint":false},{"year":2012,"finding":"Sub1 genetically interacts with the elongation factor Spt5 gene; Sub1 influences Spt5 phosphorylation of the RNAPII CTD by kinase Bur1; Sub1 and Spt5 co-purify in the same complex during early transcription elongation; Sub1 influences Spt5-Rpb1 interaction and transcription elongation rate of constitutive and inducible genes.","method":"Genetic interaction analysis, co-purification (complex isolation), ChIP, in vitro kinase assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-purification combined with genetic interactions, ChIP across multiple genes, and kinase assays; multiple orthogonal methods","pmids":["22973055"],"is_preprint":false},{"year":2013,"finding":"SUB1 is required for NHEJ repair of DSBs in plasmid DNA but NOT in chromosomal DNA in yeast, demonstrating a differential requirement for Sub1 in these two NHEJ pathways.","method":"NHEJ assay (plasmid re-circularization and chromosomal HO/I-SceI break repair), deletion mutant analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two distinct NHEJ assay systems used, single lab, results are a negative finding for chromosomal NHEJ","pmids":["23554872"],"is_preprint":false},{"year":2014,"finding":"Sub1 and Maf1 exert opposite effects on RNA polymerase III transcription and on yeast chronological lifespan; cells lacking Sub1 show a delay in re-proliferation and transcriptional reactivation after quiescence, and Sub1 loss causes premature death dependent on Ras/PKA and Tor1/Sch9 signalling pathways.","method":"Chronological lifespan assay, gene expression analysis, genetic interactions with signaling pathway mutants","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — lifespan assays with pathway-specific genetic interactions, single lab","pmids":["25531541"],"is_preprint":false},{"year":2015,"finding":"Yeast Sub1 and human PC4 preferentially bind to G-quadruplex (G4) DNA over other DNA structures, as identified by G-quadruplex bait pulldown and quantitative LC-MS/MS proteomics, and confirmed by ChIP showing in vivo G4 binding.","method":"G-quadruplex bait pulldown, quantitative LC-MS/MS, ChIP","journal":"Chemical communications (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity pulldown with mass spectrometry plus ChIP; two orthogonal methods, single lab","pmids":["25813861"],"is_preprint":false},{"year":2015,"finding":"Sub1 protects DNA from oxidative damage in vivo and in vitro: SUB1 mRNA is induced by oxidative stress, sub1Δ mutants show increased chromosomal DNA strand breaks after peroxide treatment, and purified Sub1 protein directly protects DNA from oxidative damage in a metal ion catalyzed oxidation assay.","method":"In vitro DNA protection assay (metal ion catalyzed oxidation), in vivo comet assay/strand break analysis, RT-PCR for stress induction","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution assay with purified protein combined with in vivo strand break analysis; single lab with two orthogonal approaches","pmids":["26708217"],"is_preprint":false},{"year":2016,"finding":"SUB1 knockdown in prostate cancer cells results in reduced cell proliferation, invasion, and migration in vitro and tumor growth/metastasis in vivo; ChIP revealed that SUB1 binds to the promoter regions of oncogenes PLK1, C-MYC, and BUB1B and regulates their expression; SUB1 downregulates CDKN1B expression.","method":"siRNA knockdown, in vitro invasion/migration assays, in vivo xenograft model, ChIP, gene expression analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus ChIP for promoter occupancy; single lab, multiple methods","pmids":["27270442"],"is_preprint":false},{"year":2016,"finding":"Sub1 binds to promoters of approximately half the yeast genome (by ChIP-Seq); sub1Δ mutant RNA-Seq shows the majority of genes have no change in expression, but of those that do change, most show decreased expression, consistent with Sub1 acting as a positive transcriptional regulator; Sub1 deletion increases basal expression of pheromone-inducible genes including FUS1 and IMD2.","method":"ChIP-Seq (first reported for Sub1), RNA-Seq of sub1Δ mutant, FACS-based barcode sequencing screen","journal":"G3 (Bethesda, Md.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-Seq and RNA-Seq; single lab but genome-scale orthogonal approaches","pmids":["26837954"],"is_preprint":false},{"year":2017,"finding":"Sub1 physically interacts with the RNAPII stalk domain (Rpb4/7 heterodimer), likely through its C-terminal region, and associates with the phosphatase Fcp1; a complete CTD is necessary for Sub1 association with chromatin and RNAPII; Sub1-Rpb4/7-Fcp1 interaction modulates CTD phosphorylation; Sub1 interaction with Rpb4/7 also influences transcription start site selection and elongation rate via the clamp domain.","method":"Co-immunoprecipitation (Co-IP), ChIP, genetic interaction analysis (clamp domain mutants), yeast two-hybrid","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP combined with ChIP and genetic interactions; multiple orthogonal methods with functional consequence","pmids":["27924005"],"is_preprint":false},{"year":2017,"finding":"Sub1 disruption in yeast leads to genome-wide redistribution of APOBEC-induced clustered mutations; inactivation of Sub1 strongly reduces deaminase-induced mutation frequency at CAN1 but does not decrease total SNV load; mutations redistribute toward transcription initiation regions, implicating Sub1 in protection of ssDNA during transcription from deaminase activity.","method":"Whole-genome sequencing of drug-resistant mutants, genetic deletion of SUB1, mutation frequency assay","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — whole-genome sequencing of deletion mutants combined with functional mutation frequency assays; single lab","pmids":["25941824"],"is_preprint":false},{"year":2017,"finding":"Sub1 and its human homolog PC4 suppress G4 DNA-associated genome instability at co-transcriptionally formed G4 structures; Sub1 interacts specifically with co-transcriptionally formed G4 DNA in vivo; Sub1 physically and genetically interacts with the G4-resolving helicase Pif1, suggesting a cooperative mechanism in G4 suppression.","method":"Reporter assay for G4-induced recombination in yeast, ChIP, genetic interaction analysis, G4 ligand sensitivity assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and biochemical analysis of G4 suppression with ChIP and physical interaction data; single lab, multiple methods","pmids":["28369605"],"is_preprint":false},{"year":2015,"finding":"Deletion of SUB1 significantly increased sporulation efficiency in yeast; SUB1 transcript and protein levels are downregulated during sporulation; Sub1 associates with chromatin at middle sporulation gene loci in a temporal pattern inversely correlated with their expression; SUB1 genetically interacts with HOS2 (component of Set3 repressor complex), suggesting Sub1 functions with this complex to repress sporulation genes.","method":"Sporulation efficiency assay, RT-qPCR, Western blot, ChIP, genetic interaction (sub1Δ × hos2Δ), complementation with human PC4","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, expression, genetic interaction, complementation); single lab","pmids":["26147804"],"is_preprint":false},{"year":2022,"finding":"The Role of Sub1 in transcription elongation depends on its C-terminal (CT) region and is independent of the ssDNA-binding domain (ssDBD); specific residues in the ssDBD are required for DNA interaction in vivo and Sub1 recruitment to promoters, while the CT region is required for transcription elongation by RNAPII.","method":"Site-directed mutagenesis, ChIP, genetic analysis, in vivo transcription assays","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-dissecting mutagenesis combined with ChIP and genetic analysis; single lab, multiple methods","pmids":["36291192"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of MoSub1 (Sub1/PC4 ortholog from rice blast fungus) complexed with ssDNA reveals that a phosphate ion at the protein-DNA interface bridges Lys84 of the protein and two nucleotides, altering the DNA binding mode (L mode vs. straight mode), providing structural insight into how phosphorylation modulates Sub1 ssDNA binding.","method":"X-ray crystallography (2.04 Å resolution), SAXS analysis","journal":"Proteins","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional validation by SAXS; single lab but Tier 1 structural method","pmids":["30561148"],"is_preprint":false},{"year":2021,"finding":"In macrophages, SUB1 mediates pro-atherogenic TLR2/TLR4 signaling effects; myeloid-specific Sub1 knockout reduces atherosclerosis in ApoE-/- mice; SUB1 activates Irf1 transcription in a casein kinase 2 (Ck2)-dependent manner; Sub1-knockout macrophages show decreased Irf1 expression and enhanced M2 polarization; artificial Irf1 overexpression in Sub1-knockout macrophages restores M1 skewing.","method":"Myeloid-specific conditional knockout in ApoE-/- mice, bone marrow transplantation, promoter analysis, Irf1 overexpression rescue experiment, macrophage polarization assays","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with defined pathway placement (CK2→SUB1→IRF1), rescue by Irf1 overexpression, and multiple in vivo/in vitro readouts","pmids":["34378353"],"is_preprint":false},{"year":2024,"finding":"SUB1 (human PC4) directly binds to N2-alkyl-dG DNA lesions and promotes their repair in human cells; SUB1 binds preferentially to both cis and trans diastereomers of N2-BPDE-dG over unmodified dG; genetic ablation of SUB1 confers diminished repair of both N2-BPDE-dG diastereomers; SUB1 depletion sensitizes cells to BPDE.","method":"Photo-crosslinking coupled with quantitative mass spectrometry proteomics, in vitro DNA binding assays, cell-based repair assays with SUB1 knockout","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding demonstrated with purified protein plus in-cell repair assay with genetic ablation; multiple orthogonal methods","pmids":["39101269"],"is_preprint":false},{"year":2024,"finding":"SUB1 promotes colorectal cancer metastasis by activating NF-κB signaling: SUB1 interacts with and increases the protein level of E3 ubiquitin ligase UBR5, which mediates Lys11-linked polyubiquitination and degradation of NF-κB negative regulator UBXN1, thereby activating NF-κB and its transcriptional targets CXCL1 and CXCL3.","method":"Co-immunoprecipitation, ubiquitination assay (Lys11 linkage-specific), siRNA knockdown, in vivo xenograft metastasis model, gene expression analysis","journal":"Science China. Life sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with functional ubiquitination assay and in vivo model; pathway mechanistically placed with multiple orthogonal methods","pmids":["38240906"],"is_preprint":false},{"year":2025,"finding":"SUB1 expression is induced by the TCR-IRF4 transcription factor axis in CD4+ T cells; SUB1 undergoes liquid-liquid phase separation to form condensates that open chromatin at Junb and Dock2 loci; SUB1 directly trans-activates Junb transcription and partners with JUNB to amplify Dock2 transcription; conditional T cell-specific Sub1 deletion reduces DOCK2 expression, inhibits Rac-dependent actin polymerization and T cell motility, and prevents onset of experimental autoimmune encephalomyelitis.","method":"Conditional T cell-specific knockout mouse model, ATAC-seq, ChIP, phase separation assay, T cell motility assay, EAE induction model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional knockout with disease phenotype, phase separation biochemistry, ChIP, and ATAC-seq; multiple orthogonal methods establishing pathway mechanistically","pmids":["41371223"],"is_preprint":false},{"year":2025,"finding":"SUB1 depletion increases replication stress at ALT telomeres, profoundly impairing ALT cancer cell growth without impacting telomerase-positive cells; during replication stress, SUB1 is recruited to stalled forks and ALT telomeres via its ssDNA-binding domain; RPA depletion potentiates SUB1 recruitment, suggesting competition for ssDNA; SUB1 depletion combined with FANCM depletion or RS-inducing drugs triggers replication catastrophe in ALT cells.","method":"CRISPR fitness screens, siRNA knockdown, replication stress assays, immunofluorescence/localization at stalled forks, genetic epistasis with FANCM and RPA","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide CRISPR screen plus loss-of-function with multiple cellular phenotype readouts and genetic epistasis; multiple orthogonal methods","pmids":["39772744"],"is_preprint":false},{"year":2016,"finding":"Osmostress transcription factor Hot1 physically associates with Sub1 and recruits it (along with elongation complex Spt4/5) to the promoter/5'-coding region of osmostress genes under hyperosmotic stress conditions.","method":"Co-immunoprecipitation (physical interaction), ChIP, genetic interaction analysis","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP combined with ChIP; single lab, two orthogonal methods","pmids":["27480106"],"is_preprint":false},{"year":2023,"finding":"Pif1 helicase physically interacts with Sub1 and catalyzes ATP-dependent disruption of Sub1-bound G4 DNA structures, remodeling Sub1-G4 protein-nucleic acid complexes.","method":"In vitro helicase/displacement assay, protein-protein interaction assay, ATPase-dependent mechanism analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution of Pif1-mediated Sub1 displacement from G4 DNA; single lab","pmids":["37948114"],"is_preprint":false}],"current_model":"SUB1/PC4 is a conserved ssDNA/G-quadruplex-binding transcriptional coactivator that functions at multiple steps of the RNA Pol II and Pol III transcription cycle—binding TFIIB and promoter ssDNA during preinitiation complex assembly, interacting with the RNAPII stalk (Rpb4/7) through its C-terminal region to globally regulate CTD phosphorylation and elongation rate, associating with 3' end processing factor Pta1/CPF to couple transcription and mRNA cleavage, suppressing G4-induced genome instability in cooperation with Pif1 helicase, and protecting ssDNA and DNA lesions (including N2-alkyl-dG) from damage; in mammalian cells it activates downstream oncogenic transcription programs (PLK1, MYC, NF-κB/IRF1, DOCK2/JUNB) and drives pathogenic T cell trafficking and macrophage TLR responses, with its activity modulated by phosphorylation and, in the context of ALT cancer, by competing with RPA for ssDNA at stalled replication forks."},"narrative":{"mechanistic_narrative":"SUB1 (yeast homolog of mammalian coactivator PC4) is a conserved single-stranded DNA-binding transcriptional coactivator that acts at multiple steps of the RNA polymerase II and III transcription cycle and additionally protects single-stranded DNA from damage [PMID:8617240, PMID:19204085, PMID:22055186]. It was first identified genetically as a suppressor of TFIIB mutations that binds TFIIB directly and modulates TBP-TFIIB-promoter complex assembly during initiation [PMID:8617240], and it functionally couples initiation to downstream events through mutually exclusive interactions with the 3' end processing factor Pta1/CPF and influence over start-site selection [PMID:10511545, PMID:12704082]. Sub1 is a component of the RNA Pol II preinitiation complex, localizing near the transcription bubble where it and RPA compete for the nontemplate single-strand [PMID:22055186], and it occupies promoters of roughly half the genome to act predominantly as a positive regulator of both Pol II and Pol III transcription, facilitating polymerase recruitment and stimulating Pol III initiation/reinitiation [PMID:19204085, PMID:19706510, PMID:26837954]. During elongation it engages the RNAPII stalk (Rpb4/7) and the phosphatase Fcp1 through its C-terminal region to globally tune CTD phosphorylation by multiple CTD kinases and to set elongation rate, a function genetically and physically linked to Spt5 [PMID:20823273, PMID:22973055, PMID:27924005, PMID:36291192]. Through its ssDNA- and G-quadruplex-binding activity, Sub1 protects DNA: it preferentially binds G4 DNA and cooperates with the Pif1 helicase to suppress G4-associated genome instability [PMID:25813861, PMID:28369605, PMID:37948114], shields transcribed ssDNA from oxidative and deaminase-induced damage [PMID:26708217, PMID:25941824], and the human protein binds and promotes repair of N2-alkyl-dG lesions [PMID:39101269]. In mammalian disease contexts SUB1/PC4 drives oncogenic and inflammatory transcription programs—activating PLK1/C-MYC/BUB1B in prostate cancer [PMID:27270442], promoting colorectal cancer metastasis via UBR5-dependent UBXN1 degradation and NF-κB activation [PMID:38240906], mediating CK2-dependent IRF1 induction and M1 macrophage polarization in atherosclerosis [PMID:34378353], and undergoing phase separation to open chromatin and trans-activate Junb/Dock2 to drive pathogenic T cell motility [PMID:41371223]—and supports ALT cancer cell survival by relocating to stalled replication forks via its ssDNA-binding domain [PMID:39772744]. A crystal structure of an ortholog bound to ssDNA shows a phosphate-bridged interface that rationalizes how phosphorylation modulates its DNA-binding mode [PMID:30561148].","teleology":[{"year":1996,"claim":"Established Sub1's founding biochemical role by showing it acts in transcription initiation through TFIIB, answering how this factor enters the transcription cycle.","evidence":"Genetic suppressor screen of TFIIB mutants with in vitro TFIIB binding and in vivo activation assays in yeast","pmids":["8617240"],"confidence":"High","gaps":["Mechanism of TFIIB release during initiation not structurally resolved","Did not address post-initiation roles"]},{"year":1999,"claim":"Placed Sub1 in a functional network with TFIIB and Ssu72 governing transcription start-site accuracy.","evidence":"Allele-specific genetic interaction analysis with TFIIB (sua7) mutants in yeast","pmids":["10511545"],"confidence":"Medium","gaps":["Genetic interactions do not define direct physical contacts","Molecular basis of start-site selection effect unresolved"]},{"year":2003,"claim":"Linked transcription initiation to 3' end processing by demonstrating Sub1 physically and functionally engages the CPF subunit Pta1.","evidence":"Co-purification, genetic suppression of pta1, and in vitro cleavage assay in yeast","pmids":["12704082"],"confidence":"High","gaps":["How mutually exclusive Pta1 binding with Ssu72 is regulated unknown"]},{"year":2005,"claim":"Extended Sub1's role beyond initiation to elongation by showing it influences CTD-modifying enzymes and polymerase occupancy along gene bodies.","evidence":"ChIP across multiple genes, genetic interactions with KIN28/FCP1, Western blot in yeast","pmids":["15692559"],"confidence":"High","gaps":["Direct vs indirect effect on Fcp1 accumulation not separated"]},{"year":2009,"claim":"Defined Sub1 as a broad, promoter-associated facilitator of both Pol II and Pol III polymerase recruitment, including direct stimulation of Pol III initiation/reinitiation in a reconstituted system.","evidence":"Genome-wide ChIP/ChIP-chip and in vitro reconstituted Pol III transcription with recombinant factors in yeast","pmids":["19204085","19706510"],"confidence":"High","gaps":["Why Sub1 acts at Pol II/III but not Pol I genes unexplained","Mechanism of reinitiation stimulation not structurally defined"]},{"year":2011,"claim":"Positioned Sub1 within the PIC at the transcription bubble and revealed competition with RPA for the nontemplate single-strand, framing its ssDNA-protective function.","evidence":"Quantitative PIC proteomics, in vitro transcription bubble binding, ChIP and genetic epistasis in yeast","pmids":["22055186"],"confidence":"High","gaps":["Functional consequence of Sub1/RPA competition for transcription output not fully defined"]},{"year":2010,"claim":"Showed Sub1 globally modulates CTD phosphorylation by acting in opposite directions on distinct CTD kinases, explaining its dual activating/repressive transcriptional effects.","evidence":"In vitro kinase assays, ChIP, and genetic interactions with all four CTD kinases in yeast","pmids":["20823273"],"confidence":"High","gaps":["How Sub1 selectively redistributes kinases on chromatin mechanistically unresolved"]},{"year":2012,"claim":"Connected Sub1 to elongation-factor Spt5 and elongation rate control, integrating it into early elongation complexes.","evidence":"Genetic interactions, complex co-purification, ChIP and kinase assays in yeast","pmids":["22973055"],"confidence":"High","gaps":["Stoichiometry and timing of Sub1-Spt5 association not defined"]},{"year":2015,"claim":"Identified Sub1/PC4 as a preferential G-quadruplex binder and a direct DNA-protective factor against oxidative damage, expanding its role to genome maintenance.","evidence":"G4 bait pulldown with LC-MS/MS and ChIP; in vitro metal-ion oxidation protection and in vivo strand-break assays in yeast","pmids":["25813861","26708217"],"confidence":"Medium","gaps":["Whether G4 binding and oxidative protection use the same surface unresolved","In vivo significance of direct DNA protection not quantified"]},{"year":2017,"claim":"Established Sub1 as a protector of transcription-associated single-stranded DNA and a suppressor of co-transcriptional G4 instability acting with Pif1.","evidence":"Whole-genome sequencing of deaminase mutation patterns and G4 recombination reporters with Pif1 genetic/physical interaction in yeast","pmids":["25941824","28369605"],"confidence":"Medium","gaps":["Mechanistic interplay between Sub1 binding and Pif1 resolution at G4 not biochemically detailed at this stage"]},{"year":2017,"claim":"Resolved how Sub1 mechanically influences the polymerase by mapping its physical contact to the Rpb4/7 stalk and Fcp1, linking these contacts to CTD phosphorylation, start-site selection and elongation rate.","evidence":"Co-IP, yeast two-hybrid, ChIP and clamp-domain genetic interactions in yeast","pmids":["27924005"],"confidence":"High","gaps":["Structural basis of the Sub1-Rpb4/7 interaction not solved"]},{"year":2018,"claim":"Provided structural insight into how phosphorylation can modulate Sub1 ssDNA binding via a phosphate-bridged protein-DNA interface.","evidence":"X-ray crystallography (2.04 Å) and SAXS of the MoSub1 ortholog bound to ssDNA","pmids":["30561148"],"confidence":"High","gaps":["Direct demonstration that physiological phosphorylation switches DNA-binding mode in cells absent"]},{"year":2022,"claim":"Dissected Sub1 domains to show elongation function maps to the C-terminal region independently of the ssDNA-binding domain, which instead governs promoter recruitment.","evidence":"Site-directed mutagenesis, ChIP and in vivo transcription assays in yeast","pmids":["36291192"],"confidence":"Medium","gaps":["C-terminal effector partners during elongation not identified"]},{"year":2023,"claim":"Reconstituted the Pif1-Sub1 G4 mechanism, showing Pif1 ATP-dependently remodels Sub1-bound G4 complexes.","evidence":"In vitro helicase/displacement assays with purified proteins","pmids":["37948114"],"confidence":"Medium","gaps":["In vivo coordination of Sub1 binding and Pif1 displacement timing unresolved"]},{"year":2024,"claim":"Demonstrated PC4/SUB1 directly recognizes and promotes repair of bulky N2-alkyl-dG DNA adducts in human cells, linking ssDNA/lesion binding to genome protection in mammals.","evidence":"Photo-crosslinking mass spectrometry, in vitro binding, and cell-based repair assays with SUB1 knockout","pmids":["39101269"],"confidence":"High","gaps":["Repair pathway through which SUB1 channels lesions not defined","Whether lesion repair uses the transcriptional or G4-binding surface unclear"]},{"year":2024,"claim":"Defined a mammalian oncogenic mechanism in which SUB1 drives colorectal metastasis by stabilizing UBR5 to degrade UBXN1 and activate NF-κB.","evidence":"Co-IP, Lys11-linkage ubiquitination assays, knockdown, and in vivo xenograft metastasis model","pmids":["38240906"],"confidence":"High","gaps":["How SUB1 increases UBR5 protein level mechanistically unresolved","Relationship to SUB1's transcriptional coactivator role unclear"]},{"year":2025,"claim":"Showed SUB1 acts in immune cells through phase separation and transcriptional activation—opening chromatin and driving Junb/Dock2 to control T cell motility and disease, and CK2-dependent IRF1 induction in macrophages.","evidence":"T cell- and myeloid-specific conditional knockout mice with EAE/atherosclerosis models, ATAC-seq, ChIP, phase-separation assays","pmids":["41371223","34378353"],"confidence":"High","gaps":["Determinants of SUB1 condensate formation at specific loci undefined","Link between phase separation and CTD/elongation functions unexplored"]},{"year":2025,"claim":"Identified a synthetic vulnerability in ALT cancers where SUB1 is recruited to stalled forks/ALT telomeres via its ssDNA-binding domain, competing with RPA to manage replication stress.","evidence":"CRISPR fitness screens, siRNA, replication-stress assays, localization, and FANCM/RPA epistasis in human cells","pmids":["39772744"],"confidence":"High","gaps":["How SUB1 protects forks mechanistically beyond ssDNA binding unresolved","Selectivity for ALT over telomerase-positive cells not fully explained"]},{"year":null,"claim":"How the conserved ssDNA/G4-binding surface is partitioned across SUB1's transcriptional, DNA-protective, replication-fork, and phase-separation functions—and how phosphorylation switches between them in vivo—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model coupling DNA binding to transcription versus repair roles","Regulation of SUB1 condensate assembly at target loci undefined","Direct in-cell evidence linking phosphorylation to a DNA-binding-mode switch lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8,12,13,21,23,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,6,15,25]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,5,8,15]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[3,5,19,26]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,5,6,7,15]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[13,17,18,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[22,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,22,24,25,26]}],"complexes":["RNA Pol II preinitiation complex"],"partners":["TFIIB","PTA1","RPB4/7","FCP1","SPT5","PIF1","UBR5","JUNB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P53999","full_name":"Activated RNA polymerase II transcriptional coactivator p15","aliases":["Positive cofactor 4","PC4","SUB1 homolog","p14"],"length_aa":127,"mass_kda":14.4,"function":"General coactivator that functions cooperatively with TAFs and mediates functional interactions between upstream activators and the general transcriptional machinery. 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Section D, Structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/37428845","citation_count":3,"is_preprint":false},{"pmid":"37270542","id":"PMC_37270542","title":"Introgression of SUB1 aggravates the susceptibility of the popular rice cultivars Swarna and Savitri to stagnant flooding.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/37270542","citation_count":2,"is_preprint":false},{"pmid":"36291192","id":"PMC_36291192","title":"The Role of S. cerevisiae Sub1/PC4 in Transcription Elongation Depends on the C-Terminal Region and Is Independent of the ssDNA Binding Domain.","date":"2022","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/36291192","citation_count":1,"is_preprint":false},{"pmid":"39832214","id":"PMC_39832214","title":"Towards Improved Peptidic α-Ketoamide Inhibitors of the Plasmodial Subtilisin-Like SUB1: Exploration of N-Terminal Extensions and Cyclic Constraints.","date":"2025","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/39832214","citation_count":1,"is_preprint":false},{"pmid":"39779368","id":"PMC_39779368","title":"Single Precursor-Derived Sub-1 nm MoCo Bimetallic Particles Decorated on Phosphide-Carbon Nitride Framework for Sustainable Hydrogen Generation.","date":"2025","source":"ACS applied materials & interfaces","url":"https://pubmed.ncbi.nlm.nih.gov/39779368","citation_count":1,"is_preprint":false},{"pmid":"41371223","id":"PMC_41371223","title":"The TCR-SUB1-DOCK2 axis promotes autoimmunity by driving pathogenic CD4+ T cell tissue infiltration.","date":"2025","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/41371223","citation_count":0,"is_preprint":false},{"pmid":"42118510","id":"PMC_42118510","title":"Chromosome-Level Genome Assembly Identifies RIRE2 and CACTA Transposable Elements at the Sub1 Locus in Submergence-Tolerant Rice Varieties.","date":"2026","source":"Rice (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/42118510","citation_count":0,"is_preprint":false},{"pmid":"40191457","id":"PMC_40191457","title":"The transcriptome landscape of Kumrogarh, a unique rice landrace showing the simultaneous presence of Sub1 and SK loci for submergence tolerance.","date":"2025","source":"3 Biotech","url":"https://pubmed.ncbi.nlm.nih.gov/40191457","citation_count":0,"is_preprint":false},{"pmid":"41693267","id":"PMC_41693267","title":"Machine Learning-Assisted Screening of High-Entropy Sub-1 nm Nanowires for Ultrasound-Augmented Pancatalytic Tumor Therapy.","date":"2026","source":"Journal of the American Chemical Society","url":"https://pubmed.ncbi.nlm.nih.gov/41693267","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.26.656110","title":"From lab to field: analyses of genome-edited bacterial blight resistant rice","date":"2025-05-29","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.26.656110","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.08.647803","title":"<i>EPB41L4A-AS1</i>  long noncoding RNA acts in both  <i>cis</i>  - and  <i>trans</i>  -acting transcriptional regulation and controls nucleolar biology","date":"2025-04-09","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.08.647803","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.11.612414","title":"Evaluation of stress tolerance in IR64 rice near-isogenic lines carrying  <i>SUB1</i>  and  <i>DRO1</i>  genes","date":"2024-09-14","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.11.612414","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.23.614591","title":"Assessing Stress Tolerance of  <i>SUBI</i>  and  <i>DRO1</i>  Introgression lines Under Flooding and Drought Conditions at Different Growth Stages","date":"2024-09-24","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.23.614591","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":38971,"output_tokens":7053,"usd":0.111354,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16381,"output_tokens":5419,"usd":0.10869,"stage2_stop_reason":"end_turn"},"total_usd":0.220044,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Yeast SUB1 was isolated as a suppressor of TFIIB mutations (E62G, R78H); SUB1 binds directly to TFIIB in vitro and specifically inhibits the formation of TBP-TFIIB-promoter complexes, suggesting a role in TFIIB release during transcription initiation.\",\n      \"method\": \"Genetic suppressor screen, in vitro binding assay (pulldown), in vivo transcriptional activation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic suppressor screen combined with in vitro TFIIB-binding assay and in vivo transcriptional activation; multiple orthogonal methods in a single study, replicated genetically\",\n      \"pmids\": [\"8617240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Allele-specific genetic interactions between ssu72 and sub1 with TFIIB (sua7) mutants demonstrate functional interactions among TFIIB, Ssu72, and Sub1 that influence the accuracy of transcription start site selection by RNA polymerase II.\",\n      \"method\": \"Error-prone PCR mutagenesis of TFIIB, genetic interaction analysis (synthetic lethality/suppression), allele-specificity tests\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with allele-specific interactions, single lab, multiple alleles tested\",\n      \"pmids\": [\"10511545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Sub1 physically interacts with the Pta1 subunit of CPF (cleavage/polyadenylation factor), and overexpression of SUB1 suppresses growth and processing defects of a pta1 mutation; physical interactions of Ssu72 and Sub1 with Pta1 are mutually exclusive, linking transcription initiation and 3' end processing machineries.\",\n      \"method\": \"Biochemical co-purification, genetic suppression (overexpression of SUB1 rescuing pta1 mutant), in vitro cleavage assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal physical interaction combined with functional genetic rescue and in vitro cleavage assay; multiple orthogonal methods\",\n      \"pmids\": [\"12704082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sub1 and Rna15 (yeast CstF-64 homolog) are recruited to promoters and present along the length of several yeast genes; deletion of SUB1 causes decreased accumulation of Fcp1, altered RNAP II CTD phosphorylation, and decreased crosslinking of RNAP II to transcribed genes, indicating Sub1 facilitates elongation by influencing CTD-modifying enzymes.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), allele-specific genetic interactions with KIN28 and FCP1, Western blot\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP across multiple genes combined with genetic interactions and biochemical analysis; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"15692559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Sub1 functions as a transcriptional repressor at the IMD2 gene in yeast: deletion of SUB1 increases IMD2 expression, and Sub1 localizes to the IMD2 promoter region; the upstream region of the transcription start site is required for Sub1-mediated repression.\",\n      \"method\": \"ChIP, gene expression analysis (RT-PCR/Northern), genetic interaction with dst1 (TFIIS)\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP localization combined with expression analysis and genetic interaction, single lab\",\n      \"pmids\": [\"18823333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sub1 is present at the promoter of every constitutively transcribed RNAP II and RNAP III gene tested (but not RNAP I), and deletion of SUB1 reduces promoter-associated RNAP II or III levels without reducing TBP levels, indicating Sub1 facilitates polymerase recruitment at both RNAP II and RNAP III genes.\",\n      \"method\": \"ChIP, synthetic genetic array screen (SGA), genetic interactions with HOG pathway genes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide ChIP combined with functional genetic screen and quantitative polymerase recruitment assays; multiple orthogonal methods\",\n      \"pmids\": [\"19204085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Sub1 is present on Pol III-transcribed genes genome-wide, interacts with components of the Pol III transcription system, and stimulates the initiation and reinitiation steps in a system reconstituted with all recombinant factors; Sub1 is required for optimal Pol III gene transcription in exponentially growing cells.\",\n      \"method\": \"Genome-wide ChIP-chip, in vitro reconstituted transcription assay with recombinant factors, genetic analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with recombinant factors combined with genome-wide ChIP and genetic validation\",\n      \"pmids\": [\"19706510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sub1 globally regulates RNA polymerase II CTD phosphorylation: SUB1 deletion increased CTD phosphorylation by Kin28, Bur1, and Ctk1 but decreased it by Srb10; ChIP showed SUB1 deletion decreased Srb10 chromatin association but increased Kin28 and Ctk1 chromatin association on active genes.\",\n      \"method\": \"In vitro kinase assays, ChIP, genetic interactions with all four CTD kinase genes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assays combined with ChIP and genetic interactions with all four CTD kinases; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"20823273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sub1 (homolog of mammalian coactivator PC4) is a component of RNA polymerase II preinitiation complexes (PICs); Sub1 localizes near the transcription bubble in vitro and binds to promoters in vivo dependent upon PIC assembly; Sub1 and RPA compete for a common ssDNA binding site (nontemplate strand), with RPA increasing at active promoters when Sub1 is deleted or its ssDNA-binding is mutated.\",\n      \"method\": \"Quantitative proteomic analysis of RNApII PICs (mass spectrometry), in vitro transcription bubble binding, ChIP, genetic interactions\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative proteomics of PICs, in vitro transcription bubble localization, ChIP, and genetic epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"22055186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sub1 genetically interacts with the elongation factor Spt5 gene; Sub1 influences Spt5 phosphorylation of the RNAPII CTD by kinase Bur1; Sub1 and Spt5 co-purify in the same complex during early transcription elongation; Sub1 influences Spt5-Rpb1 interaction and transcription elongation rate of constitutive and inducible genes.\",\n      \"method\": \"Genetic interaction analysis, co-purification (complex isolation), ChIP, in vitro kinase assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-purification combined with genetic interactions, ChIP across multiple genes, and kinase assays; multiple orthogonal methods\",\n      \"pmids\": [\"22973055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SUB1 is required for NHEJ repair of DSBs in plasmid DNA but NOT in chromosomal DNA in yeast, demonstrating a differential requirement for Sub1 in these two NHEJ pathways.\",\n      \"method\": \"NHEJ assay (plasmid re-circularization and chromosomal HO/I-SceI break repair), deletion mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two distinct NHEJ assay systems used, single lab, results are a negative finding for chromosomal NHEJ\",\n      \"pmids\": [\"23554872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Sub1 and Maf1 exert opposite effects on RNA polymerase III transcription and on yeast chronological lifespan; cells lacking Sub1 show a delay in re-proliferation and transcriptional reactivation after quiescence, and Sub1 loss causes premature death dependent on Ras/PKA and Tor1/Sch9 signalling pathways.\",\n      \"method\": \"Chronological lifespan assay, gene expression analysis, genetic interactions with signaling pathway mutants\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — lifespan assays with pathway-specific genetic interactions, single lab\",\n      \"pmids\": [\"25531541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Yeast Sub1 and human PC4 preferentially bind to G-quadruplex (G4) DNA over other DNA structures, as identified by G-quadruplex bait pulldown and quantitative LC-MS/MS proteomics, and confirmed by ChIP showing in vivo G4 binding.\",\n      \"method\": \"G-quadruplex bait pulldown, quantitative LC-MS/MS, ChIP\",\n      \"journal\": \"Chemical communications (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity pulldown with mass spectrometry plus ChIP; two orthogonal methods, single lab\",\n      \"pmids\": [\"25813861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Sub1 protects DNA from oxidative damage in vivo and in vitro: SUB1 mRNA is induced by oxidative stress, sub1Δ mutants show increased chromosomal DNA strand breaks after peroxide treatment, and purified Sub1 protein directly protects DNA from oxidative damage in a metal ion catalyzed oxidation assay.\",\n      \"method\": \"In vitro DNA protection assay (metal ion catalyzed oxidation), in vivo comet assay/strand break analysis, RT-PCR for stress induction\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution assay with purified protein combined with in vivo strand break analysis; single lab with two orthogonal approaches\",\n      \"pmids\": [\"26708217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SUB1 knockdown in prostate cancer cells results in reduced cell proliferation, invasion, and migration in vitro and tumor growth/metastasis in vivo; ChIP revealed that SUB1 binds to the promoter regions of oncogenes PLK1, C-MYC, and BUB1B and regulates their expression; SUB1 downregulates CDKN1B expression.\",\n      \"method\": \"siRNA knockdown, in vitro invasion/migration assays, in vivo xenograft model, ChIP, gene expression analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus ChIP for promoter occupancy; single lab, multiple methods\",\n      \"pmids\": [\"27270442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sub1 binds to promoters of approximately half the yeast genome (by ChIP-Seq); sub1Δ mutant RNA-Seq shows the majority of genes have no change in expression, but of those that do change, most show decreased expression, consistent with Sub1 acting as a positive transcriptional regulator; Sub1 deletion increases basal expression of pheromone-inducible genes including FUS1 and IMD2.\",\n      \"method\": \"ChIP-Seq (first reported for Sub1), RNA-Seq of sub1Δ mutant, FACS-based barcode sequencing screen\",\n      \"journal\": \"G3 (Bethesda, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-Seq and RNA-Seq; single lab but genome-scale orthogonal approaches\",\n      \"pmids\": [\"26837954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sub1 physically interacts with the RNAPII stalk domain (Rpb4/7 heterodimer), likely through its C-terminal region, and associates with the phosphatase Fcp1; a complete CTD is necessary for Sub1 association with chromatin and RNAPII; Sub1-Rpb4/7-Fcp1 interaction modulates CTD phosphorylation; Sub1 interaction with Rpb4/7 also influences transcription start site selection and elongation rate via the clamp domain.\",\n      \"method\": \"Co-immunoprecipitation (Co-IP), ChIP, genetic interaction analysis (clamp domain mutants), yeast two-hybrid\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP combined with ChIP and genetic interactions; multiple orthogonal methods with functional consequence\",\n      \"pmids\": [\"27924005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sub1 disruption in yeast leads to genome-wide redistribution of APOBEC-induced clustered mutations; inactivation of Sub1 strongly reduces deaminase-induced mutation frequency at CAN1 but does not decrease total SNV load; mutations redistribute toward transcription initiation regions, implicating Sub1 in protection of ssDNA during transcription from deaminase activity.\",\n      \"method\": \"Whole-genome sequencing of drug-resistant mutants, genetic deletion of SUB1, mutation frequency assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — whole-genome sequencing of deletion mutants combined with functional mutation frequency assays; single lab\",\n      \"pmids\": [\"25941824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sub1 and its human homolog PC4 suppress G4 DNA-associated genome instability at co-transcriptionally formed G4 structures; Sub1 interacts specifically with co-transcriptionally formed G4 DNA in vivo; Sub1 physically and genetically interacts with the G4-resolving helicase Pif1, suggesting a cooperative mechanism in G4 suppression.\",\n      \"method\": \"Reporter assay for G4-induced recombination in yeast, ChIP, genetic interaction analysis, G4 ligand sensitivity assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and biochemical analysis of G4 suppression with ChIP and physical interaction data; single lab, multiple methods\",\n      \"pmids\": [\"28369605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Deletion of SUB1 significantly increased sporulation efficiency in yeast; SUB1 transcript and protein levels are downregulated during sporulation; Sub1 associates with chromatin at middle sporulation gene loci in a temporal pattern inversely correlated with their expression; SUB1 genetically interacts with HOS2 (component of Set3 repressor complex), suggesting Sub1 functions with this complex to repress sporulation genes.\",\n      \"method\": \"Sporulation efficiency assay, RT-qPCR, Western blot, ChIP, genetic interaction (sub1Δ × hos2Δ), complementation with human PC4\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, expression, genetic interaction, complementation); single lab\",\n      \"pmids\": [\"26147804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Role of Sub1 in transcription elongation depends on its C-terminal (CT) region and is independent of the ssDNA-binding domain (ssDBD); specific residues in the ssDBD are required for DNA interaction in vivo and Sub1 recruitment to promoters, while the CT region is required for transcription elongation by RNAPII.\",\n      \"method\": \"Site-directed mutagenesis, ChIP, genetic analysis, in vivo transcription assays\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-dissecting mutagenesis combined with ChIP and genetic analysis; single lab, multiple methods\",\n      \"pmids\": [\"36291192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of MoSub1 (Sub1/PC4 ortholog from rice blast fungus) complexed with ssDNA reveals that a phosphate ion at the protein-DNA interface bridges Lys84 of the protein and two nucleotides, altering the DNA binding mode (L mode vs. straight mode), providing structural insight into how phosphorylation modulates Sub1 ssDNA binding.\",\n      \"method\": \"X-ray crystallography (2.04 Å resolution), SAXS analysis\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional validation by SAXS; single lab but Tier 1 structural method\",\n      \"pmids\": [\"30561148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In macrophages, SUB1 mediates pro-atherogenic TLR2/TLR4 signaling effects; myeloid-specific Sub1 knockout reduces atherosclerosis in ApoE-/- mice; SUB1 activates Irf1 transcription in a casein kinase 2 (Ck2)-dependent manner; Sub1-knockout macrophages show decreased Irf1 expression and enhanced M2 polarization; artificial Irf1 overexpression in Sub1-knockout macrophages restores M1 skewing.\",\n      \"method\": \"Myeloid-specific conditional knockout in ApoE-/- mice, bone marrow transplantation, promoter analysis, Irf1 overexpression rescue experiment, macrophage polarization assays\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with defined pathway placement (CK2→SUB1→IRF1), rescue by Irf1 overexpression, and multiple in vivo/in vitro readouts\",\n      \"pmids\": [\"34378353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SUB1 (human PC4) directly binds to N2-alkyl-dG DNA lesions and promotes their repair in human cells; SUB1 binds preferentially to both cis and trans diastereomers of N2-BPDE-dG over unmodified dG; genetic ablation of SUB1 confers diminished repair of both N2-BPDE-dG diastereomers; SUB1 depletion sensitizes cells to BPDE.\",\n      \"method\": \"Photo-crosslinking coupled with quantitative mass spectrometry proteomics, in vitro DNA binding assays, cell-based repair assays with SUB1 knockout\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding demonstrated with purified protein plus in-cell repair assay with genetic ablation; multiple orthogonal methods\",\n      \"pmids\": [\"39101269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SUB1 promotes colorectal cancer metastasis by activating NF-κB signaling: SUB1 interacts with and increases the protein level of E3 ubiquitin ligase UBR5, which mediates Lys11-linked polyubiquitination and degradation of NF-κB negative regulator UBXN1, thereby activating NF-κB and its transcriptional targets CXCL1 and CXCL3.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay (Lys11 linkage-specific), siRNA knockdown, in vivo xenograft metastasis model, gene expression analysis\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with functional ubiquitination assay and in vivo model; pathway mechanistically placed with multiple orthogonal methods\",\n      \"pmids\": [\"38240906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SUB1 expression is induced by the TCR-IRF4 transcription factor axis in CD4+ T cells; SUB1 undergoes liquid-liquid phase separation to form condensates that open chromatin at Junb and Dock2 loci; SUB1 directly trans-activates Junb transcription and partners with JUNB to amplify Dock2 transcription; conditional T cell-specific Sub1 deletion reduces DOCK2 expression, inhibits Rac-dependent actin polymerization and T cell motility, and prevents onset of experimental autoimmune encephalomyelitis.\",\n      \"method\": \"Conditional T cell-specific knockout mouse model, ATAC-seq, ChIP, phase separation assay, T cell motility assay, EAE induction model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional knockout with disease phenotype, phase separation biochemistry, ChIP, and ATAC-seq; multiple orthogonal methods establishing pathway mechanistically\",\n      \"pmids\": [\"41371223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SUB1 depletion increases replication stress at ALT telomeres, profoundly impairing ALT cancer cell growth without impacting telomerase-positive cells; during replication stress, SUB1 is recruited to stalled forks and ALT telomeres via its ssDNA-binding domain; RPA depletion potentiates SUB1 recruitment, suggesting competition for ssDNA; SUB1 depletion combined with FANCM depletion or RS-inducing drugs triggers replication catastrophe in ALT cells.\",\n      \"method\": \"CRISPR fitness screens, siRNA knockdown, replication stress assays, immunofluorescence/localization at stalled forks, genetic epistasis with FANCM and RPA\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide CRISPR screen plus loss-of-function with multiple cellular phenotype readouts and genetic epistasis; multiple orthogonal methods\",\n      \"pmids\": [\"39772744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Osmostress transcription factor Hot1 physically associates with Sub1 and recruits it (along with elongation complex Spt4/5) to the promoter/5'-coding region of osmostress genes under hyperosmotic stress conditions.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction), ChIP, genetic interaction analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP combined with ChIP; single lab, two orthogonal methods\",\n      \"pmids\": [\"27480106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pif1 helicase physically interacts with Sub1 and catalyzes ATP-dependent disruption of Sub1-bound G4 DNA structures, remodeling Sub1-G4 protein-nucleic acid complexes.\",\n      \"method\": \"In vitro helicase/displacement assay, protein-protein interaction assay, ATPase-dependent mechanism analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution of Pif1-mediated Sub1 displacement from G4 DNA; single lab\",\n      \"pmids\": [\"37948114\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SUB1/PC4 is a conserved ssDNA/G-quadruplex-binding transcriptional coactivator that functions at multiple steps of the RNA Pol II and Pol III transcription cycle—binding TFIIB and promoter ssDNA during preinitiation complex assembly, interacting with the RNAPII stalk (Rpb4/7) through its C-terminal region to globally regulate CTD phosphorylation and elongation rate, associating with 3' end processing factor Pta1/CPF to couple transcription and mRNA cleavage, suppressing G4-induced genome instability in cooperation with Pif1 helicase, and protecting ssDNA and DNA lesions (including N2-alkyl-dG) from damage; in mammalian cells it activates downstream oncogenic transcription programs (PLK1, MYC, NF-κB/IRF1, DOCK2/JUNB) and drives pathogenic T cell trafficking and macrophage TLR responses, with its activity modulated by phosphorylation and, in the context of ALT cancer, by competing with RPA for ssDNA at stalled replication forks.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SUB1 (yeast homolog of mammalian coactivator PC4) is a conserved single-stranded DNA-binding transcriptional coactivator that acts at multiple steps of the RNA polymerase II and III transcription cycle and additionally protects single-stranded DNA from damage [#0, #5, #8]. It was first identified genetically as a suppressor of TFIIB mutations that binds TFIIB directly and modulates TBP-TFIIB-promoter complex assembly during initiation [#0], and it functionally couples initiation to downstream events through mutually exclusive interactions with the 3' end processing factor Pta1/CPF and influence over start-site selection [#1, #2]. Sub1 is a component of the RNA Pol II preinitiation complex, localizing near the transcription bubble where it and RPA compete for the nontemplate single-strand [#8], and it occupies promoters of roughly half the genome to act predominantly as a positive regulator of both Pol II and Pol III transcription, facilitating polymerase recruitment and stimulating Pol III initiation/reinitiation [#5, #6, #15]. During elongation it engages the RNAPII stalk (Rpb4/7) and the phosphatase Fcp1 through its C-terminal region to globally tune CTD phosphorylation by multiple CTD kinases and to set elongation rate, a function genetically and physically linked to Spt5 [#7, #9, #16, #20]. Through its ssDNA- and G-quadruplex-binding activity, Sub1 protects DNA: it preferentially binds G4 DNA and cooperates with the Pif1 helicase to suppress G4-associated genome instability [#12, #18, #28], shields transcribed ssDNA from oxidative and deaminase-induced damage [#13, #17], and the human protein binds and promotes repair of N2-alkyl-dG lesions [#23]. In mammalian disease contexts SUB1/PC4 drives oncogenic and inflammatory transcription programs—activating PLK1/C-MYC/BUB1B in prostate cancer [#14], promoting colorectal cancer metastasis via UBR5-dependent UBXN1 degradation and NF-\\u03baB activation [#24], mediating CK2-dependent IRF1 induction and M1 macrophage polarization in atherosclerosis [#22], and undergoing phase separation to open chromatin and trans-activate Junb/Dock2 to drive pathogenic T cell motility [#25]—and supports ALT cancer cell survival by relocating to stalled replication forks via its ssDNA-binding domain [#26]. A crystal structure of an ortholog bound to ssDNA shows a phosphate-bridged interface that rationalizes how phosphorylation modulates its DNA-binding mode [#21].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established Sub1's founding biochemical role by showing it acts in transcription initiation through TFIIB, answering how this factor enters the transcription cycle.\",\n      \"evidence\": \"Genetic suppressor screen of TFIIB mutants with in vitro TFIIB binding and in vivo activation assays in yeast\",\n      \"pmids\": [\"8617240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of TFIIB release during initiation not structurally resolved\", \"Did not address post-initiation roles\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Placed Sub1 in a functional network with TFIIB and Ssu72 governing transcription start-site accuracy.\",\n      \"evidence\": \"Allele-specific genetic interaction analysis with TFIIB (sua7) mutants in yeast\",\n      \"pmids\": [\"10511545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Genetic interactions do not define direct physical contacts\", \"Molecular basis of start-site selection effect unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked transcription initiation to 3' end processing by demonstrating Sub1 physically and functionally engages the CPF subunit Pta1.\",\n      \"evidence\": \"Co-purification, genetic suppression of pta1, and in vitro cleavage assay in yeast\",\n      \"pmids\": [\"12704082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How mutually exclusive Pta1 binding with Ssu72 is regulated unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended Sub1's role beyond initiation to elongation by showing it influences CTD-modifying enzymes and polymerase occupancy along gene bodies.\",\n      \"evidence\": \"ChIP across multiple genes, genetic interactions with KIN28/FCP1, Western blot in yeast\",\n      \"pmids\": [\"15692559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect effect on Fcp1 accumulation not separated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined Sub1 as a broad, promoter-associated facilitator of both Pol II and Pol III polymerase recruitment, including direct stimulation of Pol III initiation/reinitiation in a reconstituted system.\",\n      \"evidence\": \"Genome-wide ChIP/ChIP-chip and in vitro reconstituted Pol III transcription with recombinant factors in yeast\",\n      \"pmids\": [\"19204085\", \"19706510\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why Sub1 acts at Pol II/III but not Pol I genes unexplained\", \"Mechanism of reinitiation stimulation not structurally defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Positioned Sub1 within the PIC at the transcription bubble and revealed competition with RPA for the nontemplate single-strand, framing its ssDNA-protective function.\",\n      \"evidence\": \"Quantitative PIC proteomics, in vitro transcription bubble binding, ChIP and genetic epistasis in yeast\",\n      \"pmids\": [\"22055186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Sub1/RPA competition for transcription output not fully defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed Sub1 globally modulates CTD phosphorylation by acting in opposite directions on distinct CTD kinases, explaining its dual activating/repressive transcriptional effects.\",\n      \"evidence\": \"In vitro kinase assays, ChIP, and genetic interactions with all four CTD kinases in yeast\",\n      \"pmids\": [\"20823273\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Sub1 selectively redistributes kinases on chromatin mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected Sub1 to elongation-factor Spt5 and elongation rate control, integrating it into early elongation complexes.\",\n      \"evidence\": \"Genetic interactions, complex co-purification, ChIP and kinase assays in yeast\",\n      \"pmids\": [\"22973055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and timing of Sub1-Spt5 association not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified Sub1/PC4 as a preferential G-quadruplex binder and a direct DNA-protective factor against oxidative damage, expanding its role to genome maintenance.\",\n      \"evidence\": \"G4 bait pulldown with LC-MS/MS and ChIP; in vitro metal-ion oxidation protection and in vivo strand-break assays in yeast\",\n      \"pmids\": [\"25813861\", \"26708217\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether G4 binding and oxidative protection use the same surface unresolved\", \"In vivo significance of direct DNA protection not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established Sub1 as a protector of transcription-associated single-stranded DNA and a suppressor of co-transcriptional G4 instability acting with Pif1.\",\n      \"evidence\": \"Whole-genome sequencing of deaminase mutation patterns and G4 recombination reporters with Pif1 genetic/physical interaction in yeast\",\n      \"pmids\": [\"25941824\", \"28369605\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic interplay between Sub1 binding and Pif1 resolution at G4 not biochemically detailed at this stage\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolved how Sub1 mechanically influences the polymerase by mapping its physical contact to the Rpb4/7 stalk and Fcp1, linking these contacts to CTD phosphorylation, start-site selection and elongation rate.\",\n      \"evidence\": \"Co-IP, yeast two-hybrid, ChIP and clamp-domain genetic interactions in yeast\",\n      \"pmids\": [\"27924005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the Sub1-Rpb4/7 interaction not solved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided structural insight into how phosphorylation can modulate Sub1 ssDNA binding via a phosphate-bridged protein-DNA interface.\",\n      \"evidence\": \"X-ray crystallography (2.04 \\u00c5) and SAXS of the MoSub1 ortholog bound to ssDNA\",\n      \"pmids\": [\"30561148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration that physiological phosphorylation switches DNA-binding mode in cells absent\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Dissected Sub1 domains to show elongation function maps to the C-terminal region independently of the ssDNA-binding domain, which instead governs promoter recruitment.\",\n      \"evidence\": \"Site-directed mutagenesis, ChIP and in vivo transcription assays in yeast\",\n      \"pmids\": [\"36291192\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"C-terminal effector partners during elongation not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reconstituted the Pif1-Sub1 G4 mechanism, showing Pif1 ATP-dependently remodels Sub1-bound G4 complexes.\",\n      \"evidence\": \"In vitro helicase/displacement assays with purified proteins\",\n      \"pmids\": [\"37948114\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo coordination of Sub1 binding and Pif1 displacement timing unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated PC4/SUB1 directly recognizes and promotes repair of bulky N2-alkyl-dG DNA adducts in human cells, linking ssDNA/lesion binding to genome protection in mammals.\",\n      \"evidence\": \"Photo-crosslinking mass spectrometry, in vitro binding, and cell-based repair assays with SUB1 knockout\",\n      \"pmids\": [\"39101269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repair pathway through which SUB1 channels lesions not defined\", \"Whether lesion repair uses the transcriptional or G4-binding surface unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a mammalian oncogenic mechanism in which SUB1 drives colorectal metastasis by stabilizing UBR5 to degrade UBXN1 and activate NF-\\u03baB.\",\n      \"evidence\": \"Co-IP, Lys11-linkage ubiquitination assays, knockdown, and in vivo xenograft metastasis model\",\n      \"pmids\": [\"38240906\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SUB1 increases UBR5 protein level mechanistically unresolved\", \"Relationship to SUB1's transcriptional coactivator role unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed SUB1 acts in immune cells through phase separation and transcriptional activation—opening chromatin and driving Junb/Dock2 to control T cell motility and disease, and CK2-dependent IRF1 induction in macrophages.\",\n      \"evidence\": \"T cell- and myeloid-specific conditional knockout mice with EAE/atherosclerosis models, ATAC-seq, ChIP, phase-separation assays\",\n      \"pmids\": [\"41371223\", \"34378353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of SUB1 condensate formation at specific loci undefined\", \"Link between phase separation and CTD/elongation functions unexplored\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified a synthetic vulnerability in ALT cancers where SUB1 is recruited to stalled forks/ALT telomeres via its ssDNA-binding domain, competing with RPA to manage replication stress.\",\n      \"evidence\": \"CRISPR fitness screens, siRNA, replication-stress assays, localization, and FANCM/RPA epistasis in human cells\",\n      \"pmids\": [\"39772744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SUB1 protects forks mechanistically beyond ssDNA binding unresolved\", \"Selectivity for ALT over telomerase-positive cells not fully explained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the conserved ssDNA/G4-binding surface is partitioned across SUB1's transcriptional, DNA-protective, replication-fork, and phase-separation functions—and how phosphorylation switches between them in vivo—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model coupling DNA binding to transcription versus repair roles\", \"Regulation of SUB1 condensate assembly at target loci undefined\", \"Direct in-cell evidence linking phosphorylation to a DNA-binding-mode switch lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8, 12, 13, 21, 23, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 6, 15, 25]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 5, 8, 15]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [3, 5, 19, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 5, 6, 7, 15]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [13, 17, 18, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [22, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 22, 24, 25, 26]}\n    ],\n    \"complexes\": [\n      \"RNA Pol II preinitiation complex\"\n    ],\n    \"partners\": [\n      \"TFIIB\",\n      \"Pta1\",\n      \"Rpb4/7\",\n      \"Fcp1\",\n      \"Spt5\",\n      \"Pif1\",\n      \"UBR5\",\n      \"JUNB\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}