{"gene":"RPA1","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":1990,"finding":"S. cerevisiae RPA1 encodes an essential single-stranded DNA binding protein homologous to the 70 kDa subunit of human RP-A; loss of RPA1 causes accumulation of multiply-budded cells with a single nucleus, indicating a defect in DNA replication.","method":"Gene cloning, sequence homology analysis, tetrad analysis of heterozygous insertion mutants","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype, replicated across species, foundational study","pmids":["2192864"],"is_preprint":false},{"year":1992,"finding":"HSSB/RPA1 functions at an early stage of nucleotide excision repair (NER), prior to repair synthesis; anti-HSSB antibodies that inhibit DNA polymerase alpha stimulation also inhibit NER synthesis in cell-free extracts, and when damaged DNA is pre-incised by UvrABC the requirement for HSSB is bypassed, placing RPA1 upstream of the incision step.","method":"Cell-free NER assay with neutralizing antibodies; rescue by pre-incised substrate","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution with antibody inhibition and epistasis bypass experiment, defining pathway position","pmids":["1508673"],"is_preprint":false},{"year":1992,"finding":"Bovine RP-A (RPA1/p70 subunit) directly interacts with the p48 subunit of DNA polymerase alpha-primase complex, as demonstrated by modified blotting (far-Western); bovine RP-A can substitute for human RP-A in SV40 DNA replication in vitro.","method":"Modified blotting (far-Western), in vitro SV40 replication assay","journal":"Chromosoma","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding by far-Western and functional in vitro reconstitution, single lab","pmids":["1337880"],"is_preprint":false},{"year":1993,"finding":"RP-A is essential for chromosomal DNA replication in Xenopus cell-free extracts (immunodepletion causes replication failure). During S phase, only nucleus-associated and single-stranded DNA-bound RPA is phosphorylated, and cdk2 is required for this S-phase phosphorylation indirectly (cdk2 depletion blocks replication before RPA binds ssDNA). At mitosis onset, cdc2 kinase directly phosphorylates RP-A independently of DNA binding.","method":"Immunodepletion from Xenopus extracts; immunoprecipitation-kinase assays with purified cdk2 and cdc2","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution in cell-free system plus purified kinase assays; multiple orthogonal methods distinguishing cdk2 vs cdc2 roles","pmids":["8308077"],"is_preprint":false},{"year":1995,"finding":"The RPA70 (RPA1) subunit physically associates with the EBNA-2 acidic transactivation domain; a Trp-to-Thr mutation in EBNA-2 that abolishes transactivation also disrupts the EBNA-2–RPA70 interaction, genetically linking RPA70 binding to transcriptional activation.","method":"Co-immunoprecipitation/association assay; mutational analysis of EBNA-2","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct binding assay plus mutagenesis linking interaction to function, single lab","pmids":["7983760"],"is_preprint":false},{"year":1996,"finding":"Cyclin A-Cdk2, but not cyclin E-Cdk2, efficiently phosphorylates the p34 subunit of HSSB (RPA2) in the heterotrimeric RPA complex; this differential phosphorylation is driven by a direct interaction between cyclin A and HSSB-p34, not cyclin E. The large subunit RPA70 (RPA1) is present in this complex.","method":"In vitro kinase assays with purified cyclin-Cdk2 complexes; direct binding assays between cyclin A/E and HSSB-p34","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins plus direct binding assays, mechanistic dissection of cyclin specificity","pmids":["8798463"],"is_preprint":false},{"year":1996,"finding":"Transcription positive cofactor 4 (PC4), a ssDNA-binding protein, forms complexes with HSSB/RPA on ssDNA and inhibits RPA-dependent RNA primer synthesis and DNA polymerase delta-catalyzed chain elongation in SV40 replication; excess HSSB/RPA reverses these inhibitory effects.","method":"In vitro SV40 DNA replication assay; biochemical complex formation on ssDNA","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro replication system with defined biochemical interactions","pmids":["8703021"],"is_preprint":false},{"year":1998,"finding":"Yeast RPA1 (RFA1) has multiple in vivo functions in DNA replication, repair, and recombination; specific missense mutations cause UV/MMS sensitivity and defects in mating-type switching and single-strand annealing recombination, while temperature-sensitive alleles arrest replication. Most mutations alter conserved residues also found in human and Xenopus RPA1.","method":"Genetic mutant screen; physical analysis of recombination intermediates; cell cycle analysis","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — extensive genetic epistasis and molecular phenotyping across 19+ mutants; multiple orthogonal assays","pmids":["9539419"],"is_preprint":false},{"year":1998,"finding":"Human RPA (hSSB) directly interacts with EBNA1, the latent origin binding protein of EBV; the main contact is via the 70 kDa subunit (RPA1/RPA70), and this interaction occurs both in solution and when EBNA1 is bound to the EBV origin, suggesting RPA1 participates in latent EBV origin activation.","method":"Co-immunoprecipitation; binding assays in solution and on origin DNA","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — reciprocal binding assays with subunit mapping; single lab","pmids":["9421526"],"is_preprint":false},{"year":1999,"finding":"NMR structure of the N-terminal domain of RPA70 (residues 8–108) reveals a five-stranded anti-parallel beta-barrel with a large basic cleft formed by two loops; this cleft is the likely binding site for acidic motifs of transcriptional activators including p53. Lethal or conditional-lethal yeast point mutants map to this cleft.","method":"NMR global fold determination; mapping of known yeast mutants onto structure","journal":"Journal of biomolecular NMR","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional validation via mapped yeast mutants","pmids":["10526407"],"is_preprint":false},{"year":1999,"finding":"XPA minimal DNA-binding domain contacts RPA70 (RPA1) residues spanning both the zinc-binding and loop-rich subdomains, with partial overlap with the DNA-binding surface, suggesting cooperative DNA-binding between XPA and RPA70 in NER. DNA binding by XPA is localized to the loop-rich subdomain regardless of lesion type.","method":"NMR chemical shift mapping; 15N relaxation studies of XPA-MBD bound to RPA70ΔC327","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR-based structure-function mapping of protein-protein and protein-DNA interactions","pmids":["10563794"],"is_preprint":false},{"year":2001,"finding":"The N-terminal domain of Rpa1 (Rpa1N) physically interacts with Rfc4, a small subunit of replication factor C; rfa1 mutations in Rpa1N that confer hydroxyurea sensitivity are lethal when combined with rfc4-2. Both rfc4-2 and rfa1-t11 strains are defective in G2/M DNA damage checkpoint, and RFC4 is epistatic with RAD24 for DNA damage sensitivity, placing Rpa1N-Rfc4 interaction in checkpoint signaling.","method":"Genetic interaction (synthetic lethality), hydroxyurea/DNA damage sensitivity assays, checkpoint epistasis analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — allele-specific genetic interactions plus checkpoint epistasis in multiple pathways; replicated across multiple mutant combinations","pmids":["11340166"],"is_preprint":false},{"year":2002,"finding":"Human RPA forms a complex with Rad52 through two binding sites: the C-terminal domain of RPA32 (residues 224–271) and a newly identified domain on RPA70 (residues 169–326 of RPA1). Rad52 binding to RPA increases ssDNA affinity significantly; RPA binding to Rad52 inhibits higher-order self-association of Rad52 rings. DBD-D on RPA32 is primarily responsible for ssDNA-binding enhancement.","method":"Pulldown assays with defined protein fragments; ssDNA binding assays; analysis of Rad52 self-association","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping with multiple truncation constructs and functional ssDNA binding assays; single lab","pmids":["12139939"],"is_preprint":false},{"year":2003,"finding":"Human RPA70 (RPA1) C-terminal domain (residues 432–616) and the central domain of RPA32 (residues 39–180) interact with the 3'-end of a primer at a primer-template junction, as shown by photoaffinity labeling and limited proteolysis; this interaction is distinct from ssDNA binding.","method":"Photoaffinity crosslinking; limited proteolysis; domain mapping","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct crosslinking with domain identification; single lab, two orthogonal methods","pmids":["12600993"],"is_preprint":false},{"year":2003,"finding":"Yeast Mec1 kinase physically associates with RPA and phosphorylates both RPA1 and RPA2 in vitro; the major phosphorylation site on RPA1 maps to serine 178 in the N-terminal domain (RPA1N). The phosphorylation-defective rfa1-S178A mutant shows reduced physical interaction with Mec1 and altered kinetics of RPA1 and Rad53 phosphorylation in vivo.","method":"Mec1 immunoprecipitation-kinase assay; in vitro phosphorylation with site mapping; rfa1-S178A mutant phenotypic analysis","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay with site identification and in vivo validation; single lab","pmids":["14642562"],"is_preprint":false},{"year":2005,"finding":"A heterozygous missense mutation in the DNA-binding domain of mouse Rpa1 causes defects in DNA double-strand break repair, chromosomal breaks, aneuploidy in primary MEFs, and leads to lymphoid tumors with large-scale chromosomal rearrangements. Homozygous mutation causes early embryonic lethality. The equivalent yeast mutation is hypomorphic, semidominant, and enhances gross chromosomal rearrangements.","method":"Mouse knock-in genetics; array CGH; MEF DNA repair assays; yeast genetic analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse and yeast genetics with multiple orthogonal phenotypic readouts; independent confirmation in two organisms","pmids":["15965476"],"is_preprint":false},{"year":2005,"finding":"siRNA knockdown of RPA1 in HeLa cells activates ATM (Ser1981) and Chk2 (Thr68) phosphorylation and upregulates p21, but not Chk1 (Ser345); ATM inhibitor caffeine and ATM siRNA both block Chk2 phosphorylation induced by RPA1 loss, placing RPA1 upstream of the ATM-Chk2 checkpoint axis.","method":"siRNA knockdown; immunoblotting for checkpoint kinase phosphorylation; ATM inhibitor and siRNA epistasis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with siRNA and chemical inhibitor; single lab, checkpoint pathway placement","pmids":["15620706"],"is_preprint":false},{"year":2008,"finding":"RPA1 contains four structurally related OB-fold domains; mutations that substantially decrease ssDNA binding do not necessarily disrupt cellular function, while mutations that only slightly affect ssDNA binding can dramatically affect DNA repair and cell cycle progression. The N-terminus of RPA1 is dispensable for DNA replication but required for the cellular DNA damage response. Conserved aromatic residues in high-affinity ssDNA-binding domains are essential for DNA repair.","method":"Depletion/replacement strategy in human cells; site-directed mutagenesis of individual domains; functional readouts for replication, repair, and cell cycle","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic mutagenesis of all four domains with multiple functional readouts in human cells; single rigorous study","pmids":["18469000"],"is_preprint":false},{"year":2009,"finding":"RPA1 N-terminal OB-fold domain directly interacts with MRN complex (MRE11 and NBS1); deletion of the N-terminal OB-fold or substitution of Arg31/Arg41 with alanines abrogates RPA-MRN interaction. RPA2 phosphorylation weakens the RPA-MRN interaction. Disruption of RPA-MRN binding alters cell cycle progression after DNA damage.","method":"Purified protein interaction assays; RPA2 phosphomimetic constructs; deletion and point mutagenesis of RPA1 N-terminus; cell cycle analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding with purified proteins plus mutagenesis and cell-based functional assay; single lab","pmids":["19586055"],"is_preprint":false},{"year":2011,"finding":"RPA70 N-terminal domain (DBD) binds Rad9 and p53 peptides at an overlapping surface; small molecule NSC15520 competitively inhibits binding of both Rad9-GST and p53-GST to RPA70 N-terminal DBD with IC50 ~10 μM, and inhibits RPA70 N-terminal domain-dependent helix destabilization activity, without affecting ssDNA binding.","method":"High-throughput screening; competitive binding assays with GST-fusion proteins; DNA helix-destabilization assay; computational docking","journal":"Bioorganic & medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical binding assays with defined competitive inhibitor; single lab, multiple assays","pmids":["21459001"],"is_preprint":false},{"year":2012,"finding":"Sgs1 (BLM ortholog) N-terminal acidic domain (R1 domain) directly interacts with Rpa70 (Rpa1); deletion of R1 reduces Rad53 activation on hydroxyurea. Mec1 kinase phosphorylates the Sgs1 R1 domain, which promotes high-affinity binding to the Rad53 FHA1 domain, recruiting Rad53 to stalled forks for checkpoint activation.","method":"Identification and deletion of Rpa70-binding site on Sgs1; Mec1 kinase assay; FHA1 binding assay; epistasis with repair genes","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding assay, kinase assay, genetic epistasis, multiple orthogonal methods","pmids":["22820947"],"is_preprint":false},{"year":2012,"finding":"In hypoxia, DNA-PK phosphorylates p53 at Ser15, which dissociates the p53-RPA70 (RPA1) complex; free RPA70 then enhances NER/NHEJ repair, and RPA70 gene silencing significantly increases apoptosis in hypoxic cancer cells.","method":"Co-immunoprecipitation; site-directed mutagenesis of p53 Ser/Thr residues; RPA70 gene silencing; NER/NHEJ reporter assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with mutagenesis and functional silencing readout; single lab","pmids":["22288499"],"is_preprint":false},{"year":2015,"finding":"PTEN physically associates with RPA1 via the RPA1 C-terminal domain; PTEN promotes RPA1 accumulation at replication forks (shown by iPOND) and recruits the deubiquitinase OTUB1 to mediate RPA1 deubiquitination. PTEN deletion leads to replication fork collapse, and RPA1 deletion phenocopies PTEN knockout in terms of fork stalling.","method":"Co-immunoprecipitation; STORM imaging; iPOND; ubiquitination assays; domain-mapping; knockout cell phenotyping","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, iPOND, STORM, ubiquitination assay); mechanistic pathway reconstruction in single rigorous study","pmids":["26403191"],"is_preprint":false},{"year":2017,"finding":"PCAF/GCN5 acetyltransferases acetylate RPA1 at K163; this acetylation is required for NER but not for other repair pathways. Acetylation at K163 promotes stable XPA accumulation at UV-damaged DNA. DNA-PK phosphorylates and activates PCAF upon UV damage to drive RPA1 K163 acetylation. HDAC6 and SIRT1 deacetylate RPA1 K163, and UV causes HDAC6 cytoplasmic translocation, increasing RPA1 acetylation.","method":"In vivo acetylation assays; site-directed mutagenesis (K163); NER assays; XPA foci quantification; kinase and acetyltransferase activity assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — PTM identification with mutagenesis, writer/eraser identification, functional NER pathway placement; independently reported in two concurrent papers (PMID 28854354 and 28854355)","pmids":["28854354","28854355"],"is_preprint":false},{"year":2018,"finding":"RPA1 binds to NRF2 and competes with sMAF proteins for NRF2 binding; the NRF2-RPA1 complex binds a specific ARE-NRE sequence to repress transcription of target genes, converting NRF2 from a transcriptional activator to a repressor. This was shown to repress MYLK expression and disrupt vascular integrity.","method":"Co-immunoprecipitation; ChIP; RNA-seq; genome-wide ARE-NRE analysis; reporter assays; vascular permeability assays in lung injury model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, RNA-seq with functional in vivo validation; single lab but multiple orthogonal methods","pmids":["30309964"],"is_preprint":false},{"year":2018,"finding":"LIM protein Ajuba directly and physically interacts with RPA70 (RPA1); this interaction is cell cycle-regulated and reduced upon DNA replication stress. Depletion of Ajuba leads to potent ATR activation, consistent with Ajuba acting as a negative regulator of ATR by occupying RPA70.","method":"Co-immunoprecipitation; direct binding assay; cell cycle synchronization; Ajuba depletion and ATR activation readouts","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct protein-protein interaction plus functional depletion assay; single lab","pmids":["29934626"],"is_preprint":false},{"year":2020,"finding":"CDYL negatively regulates crotonylation (Kcr) of RPA1; mutation of RPA1 crotonylation sites impairs its interaction with single-stranded DNA and with components of the DNA resection machinery, demonstrating that RPA1 Kcr is required for homologous recombination DNA repair.","method":"Quantitative proteomics crotonylome; CDYL depletion; site mutagenesis; ssDNA binding assay; HR repair assay","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics-driven PTM identification with mutagenesis and functional binding/repair assays; single lab","pmids":["32201722"],"is_preprint":false},{"year":2022,"finding":"Gain-of-function germline missense variants in RPA1 (E240K and V227A) in DNA-binding domain A cause increased binding to single-stranded and telomeric DNA, leading to severe telomere shortening and impaired hematopoietic differentiation. CRISPR/Cas9 knock-in of RPA1E240K in iPSCs recapitulates telomere shortening, establishing that hyperactive ssDNA binding by RPA1 disrupts telomere maintenance.","method":"Biochemical ssDNA/telomeric DNA binding assays; CRISPR/Cas9 knock-in; iPSC hematopoietic differentiation; somatic genetic rescue analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical gain-of-function characterization, CRISPR cellular model, and patient-derived somatic rescue; multiple orthogonal methods","pmids":["34767620"],"is_preprint":false},{"year":2022,"finding":"RPA1 binds gene regulatory regions, chromatin-remodeling factors, and HNF4A in liver cells; RPA1 promotes HNF4A transcriptional activity and fatty acid β-oxidation. Liver-specific deletion of Rpa1 in mice causes downregulation of fatty acid oxidation genes, hepatic steatosis, and hepatocellular carcinoma. Rpa1+/- mice develop fatty liver during aging and on high-fat diet.","method":"Conditional liver-specific Rpa1 knockout; ChIP; chromatin remodeling factor interaction assays; gene expression analysis; metabolic phenotyping","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with chromatin binding and functional metabolic readouts; single lab","pmids":["35830798"],"is_preprint":false},{"year":2023,"finding":"T cell-specific deletion of Rpa1 (Rpa1fl/fl Cd4-cre mice) causes peripheral T cell lymphopenia and reduced TCR repertoire diversity. Mechanistically, RPA1 depletion causes genomic DNA leakage into the cytosol, activating ZBP1-RIPK3 signaling and T cell necroptosis; chemical or genetic inhibition of necroptosis rescues the phenotype.","method":"Conditional T cell-specific Rpa1 knockout; ZBP1-RIPK3 pathway analysis; cytosolic DNA detection; necroptosis inhibition rescue experiments","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with mechanistic pathway identification and rescue; single lab","pmids":["36721037"],"is_preprint":false},{"year":2025,"finding":"Conditional knockout of Rpa1 in limb bud mesenchyme causes near-total absence of forelimbs; mechanistically, Rpa1 deletion leads to extensive DNA damage, activates the cGAS-STING pathway driving Zbp1 transcription, and causes Z-DNA accumulation that activates ZBP1-dependent PANoptosis (combined apoptosis, necroptosis, pyroptosis) in mesenchymal stem cells.","method":"Conditional Rpa1 knockout in limb mesenchyme; cGAS-STING pathway assays; Z-DNA immunostaining; PANoptosis markers; genetic epistasis with ZBP1","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional genetic KO with mechanistic pathway dissection; single lab but multiple orthogonal assays","pmids":["40834068"],"is_preprint":false},{"year":2025,"finding":"HAT1 acts as a lactyltransferase that directly catalyzes lactylation of RPA1 at K88 (and K15 of RPA1 in lung adenocarcinoma study); RPA1 lactylation at K88 facilitates RPA1 binding to ssDNA and to MRN complexes, promotes homologous recombination, and confers radioresistance. HAT1 knockout inhibits DNA repair and increases radiosensitivity.","method":"In vitro lactyltransferase assay; site-directed mutagenesis (K88); ssDNA binding assay; MRN co-immunoprecipitation; HR repair assay; HAT1 KO in vitro and in vivo","journal":"Cell death & disease / International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PTM identification with mutagenesis and functional binding/repair assays; two papers reporting same mechanism, single research group","pmids":["41271679","41694603"],"is_preprint":false},{"year":2025,"finding":"Live-cell imaging reveals that RPA1 accumulates on ssDNA at stalled replication forks (up to ~2400 nt per fork) during nucleotide depletion; ATR inhibition accelerates RPA1 accumulation ~9-fold leading to RPA exhaustion, while ATM inhibition with ATR inhibition causes persistence of ~2500 nt ssDNA per fork post-S-phase and mitotic catastrophe. MRE11 inhibition does not affect PCNA/RPA1 dynamics.","method":"Live-cell fluorescence microscopy (PCNA/RPA1 reporters); single-cell tracking at 30-second resolution; ATR/ATM inhibitors; MRE11 inhibition","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative live imaging with defined inhibitor perturbations; single lab, novel temporal resolution","pmids":["39859385"],"is_preprint":false},{"year":2023,"finding":"UBQLN1 interacts with RPA1 and shuttles it off the replication fork; UBQLN1 deficiency retains RPA1 at replication forks, hinders replication, and causes cell cycle arrest, genome instability, and rapid telomere shortening (particularly at G-rich telomeric sequences). This leads to lung fibrosis in mice.","method":"Co-immunoprecipitation; replication fork analysis; telomere length assay; UBQLN1 depletion in cells and mice","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein interaction with functional replication and telomere phenotype; single lab","pmids":["37463174"],"is_preprint":false},{"year":2024,"finding":"CDC20 stabilizes RPA1 protein through direct protein-protein interaction in early stages of DNA damage, activating ATR-mediated signaling; in later stages, CDC20 promotes ubiquitin-mediated degradation of RPA1 to complete DNA repair. CDC20 promotes homologous recombination and radioresistance.","method":"Co-immunoprecipitation; HR and NHEJ reporter systems; ubiquitination assay; tumor xenograft","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with reporter assay; mechanism proposed but limited biochemical validation of ubiquitination specificity","pmids":["39125953"],"is_preprint":false},{"year":2022,"finding":"HBoV1 NP1 protein directly interacts with RPA70 (RPA1) at domain aa181–422 with high affinity (KD ~122 nM); this NP1-RPA70 interaction is required for HBoV1 DNA replication in vitro and in infected human airway epithelium cultures.","method":"Affinity purification; equilibrium dissociation constant measurement; domain mapping; dominant-negative strategy in viral DNA replication assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding with KD measurement, domain mapping, and functional viral replication assay; single lab","pmids":["35653410"],"is_preprint":false},{"year":2025,"finding":"USP49 deubiquitinase, recruited to DNA DSBs via ATM-promoted liquid-liquid phase separation, deubiquitinates and stabilizes RPA70 (RPA1) at DSBs along with Rad51, thereby promoting homologous recombination repair and radioresistance.","method":"Co-immunoprecipitation; ubiquitination/deubiquitination assay; LLPS analysis; HR reporter; tumor xenograft","journal":"International journal of biological macromolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, Co-IP plus functional assay; deubiquitination of RPA1 by USP49 shown but limited mechanistic detail on specific ubiquitination sites","pmids":["40460957"],"is_preprint":false}],"current_model":"RPA1 (RPA70) is the large subunit of the heterotrimeric replication protein A complex that serves as the primary eukaryotic single-stranded DNA (ssDNA) binding protein; it is essential for DNA replication (where cdc2 directly phosphorylates it at mitosis and cdk2 indirectly activates it during S phase), nucleotide excision repair (via K163 acetylation by PCAF/GCN5 that promotes XPA recruitment and is reversed by HDAC6), homologous recombination (via crotonylation and lactylation that modulate ssDNA and MRN complex binding), and DNA damage checkpoint signaling (through its N-terminal OB-fold domain that interacts with Rfc4, MRN, Mec1/ATR, and Rad53/Chk2); RPA1 also forms a repressive NRF2-RPA1 transcriptional complex, controls chromatin accessibility and HNF4A activity in liver, and protects genomic integrity during embryogenesis and T cell homeostasis through the ZBP1-RIPK3 necroptosis axis."},"narrative":{"mechanistic_narrative":"RPA1 (RPA70) is the large subunit of the heterotrimeric single-stranded DNA-binding protein RPA and is an essential, evolutionarily conserved factor required for chromosomal DNA replication, with loss-of-function causing replication failure in yeast and immunodepletion blocking replication in Xenopus extracts [PMID:2192864, PMID:8308077]. Its four OB-fold domains separate two genetically distinct activities: high-affinity ssDNA binding through internal DNA-binding domains and a protein-interaction hub in the N-terminal OB-fold domain that is dispensable for replication but required for the DNA damage response [PMID:18469000]. Through this architecture RPA1 directly engages the replication and repair machinery — the DNA polymerase alpha-primase p48 subunit, primer-template junctions, XPA in nucleotide excision repair, and Rad52 in recombination — and acts at an early, pre-incision step of NER [PMID:1508673, PMID:1337880, PMID:10563794, PMID:12139939, PMID:12600993]. The N-terminal domain coordinates checkpoint signaling by binding Rfc4, the MRN complex (MRE11/NBS1), and the ATR/Mec1 and Rad53/Chk2 apparatus, and RPA1 depletion activates the ATM-Chk2 axis [PMID:11340166, PMID:14642562, PMID:15620706, PMID:19586055]. RPA1 function is tuned by writer/eraser-controlled post-translational modifications: cell-cycle phosphorylation by cdc2 and cyclin/Cdk2 kinases, PCAF/GCN5-mediated K163 acetylation (reversed by HDAC6/SIRT1) that drives XPA recruitment in NER, and CDYL-regulated crotonylation and HAT1-catalyzed K88 lactylation that promote ssDNA and MRN binding during homologous recombination [PMID:8308077, PMID:8798463, PMID:28854354, PMID:28854355, PMID:32201722, PMID:41271679, PMID:41694603]. Beyond genome maintenance, RPA1 acts in transcriptional control, converting NRF2 into a repressor at ARE-NRE elements and promoting HNF4A activity and fatty-acid oxidation in liver, where its loss causes hepatic steatosis and hepatocellular carcinoma [PMID:30309964, PMID:35830798]. In vivo, Rpa1 protects genomic integrity during development and immune homeostasis: deletion triggers cytosolic DNA leakage and ZBP1-RIPK3 necroptosis in T cells and cGAS-STING/ZBP1-driven PANoptosis in limb mesenchyme [PMID:36721037, PMID:40834068]. Germline gain-of-function variants in DNA-binding domain A that hyperactivate ssDNA/telomeric binding cause severe telomere shortening and impaired hematopoiesis [PMID:34767620].","teleology":[{"year":1990,"claim":"Established that RPA1 is an essential single-stranded DNA-binding protein required for DNA replication, defining its core cellular function.","evidence":"Gene cloning, homology analysis, and tetrad analysis of loss-of-function mutants in S. cerevisiae","pmids":["2192864"],"confidence":"High","gaps":["Molecular mechanism of how ssDNA binding supports replication not yet defined","No biochemical reconstitution of the full complex"]},{"year":1992,"claim":"Placed RPA1 upstream of incision in nucleotide excision repair and physically linked it to the polymerase alpha-primase machinery, showing it functions beyond replication.","evidence":"Cell-free NER assays with neutralizing antibodies and pre-incised substrate bypass; far-Western binding to pol alpha-primase p48","pmids":["1508673","1337880"],"confidence":"High","gaps":["Precise structural basis of NER role unresolved","Single-lab far-Western for p48 interaction"]},{"year":1993,"claim":"Resolved how RPA1 is cell-cycle regulated, distinguishing direct cdc2 phosphorylation at mitosis from indirect cdk2-dependent S-phase phosphorylation.","evidence":"Immunodepletion of Xenopus extracts and immunoprecipitation-kinase assays with purified cdk2 and cdc2","pmids":["8308077"],"confidence":"High","gaps":["Functional consequence of each phosphorylation event not fully defined","Subunit specificity of phosphorylation incomplete"]},{"year":1996,"claim":"Clarified that cyclin A-Cdk2, not cyclin E-Cdk2, phosphorylates the RPA complex via direct cyclin A docking, refining the kinase specificity of RPA regulation.","evidence":"In vitro kinase and direct binding assays with purified cyclin-Cdk2 complexes","pmids":["8798463"],"confidence":"High","gaps":["Phosphorylation maps mainly to RPA2 p34, not RPA1 directly","In vivo relevance not tested"]},{"year":1998,"claim":"Demonstrated genetically and physically that RPA1 functions in replication, repair, and recombination, and that it binds viral origin proteins via the RPA70 subunit.","evidence":"Yeast missense/ts mutant screen with recombination intermediate analysis; co-IP mapping of EBNA1 to RPA70","pmids":["9539419","9421526"],"confidence":"High","gaps":["Mechanism distinguishing repair vs recombination defects unresolved","Viral origin interaction studies single lab"]},{"year":1999,"claim":"Provided structural basis for RPA1 protein-interaction function, revealing an N-terminal OB-fold beta-barrel with a basic cleft that binds acidic activator motifs and a cooperative XPA-binding surface for NER.","evidence":"NMR fold determination of RPA70 N-terminal domain; NMR chemical-shift mapping of XPA-MBD on RPA70","pmids":["10526407","10563794"],"confidence":"High","gaps":["Full-length complex structure not resolved","How cleft selects among competing acidic partners unknown"]},{"year":2002,"claim":"Mapped a Rad52-binding domain on RPA1 and showed RPA-Rad52 interplay tunes ssDNA affinity and Rad52 oligomerization, linking RPA1 to recombination mechanics.","evidence":"Pulldown domain mapping and ssDNA-binding/self-association assays","pmids":["12139939"],"confidence":"Medium","gaps":["Single-lab domain mapping","In vivo recombination contribution of this domain not tested"]},{"year":2003,"claim":"Identified a distinct primer-template junction recognition activity in the RPA70 C-terminal domain, separating junction binding from generic ssDNA binding.","evidence":"Photoaffinity crosslinking and limited proteolysis domain mapping","pmids":["12600993"],"confidence":"Medium","gaps":["Functional role at forks not directly tested","Single-lab crosslinking"]},{"year":2001,"claim":"Connected the RPA1 N-terminal domain to checkpoint signaling through an allele-specific genetic interaction with Rfc4 in the DNA damage checkpoint.","evidence":"Synthetic lethality, HU/damage sensitivity, and checkpoint epistasis in yeast","pmids":["11340166"],"confidence":"High","gaps":["Direct physical Rpa1N-Rfc4 contact not biochemically resolved","Mechanism of checkpoint signal transfer unclear"]},{"year":2003,"claim":"Established Mec1/ATR as a kinase acting on RPA1, mapping S178 phosphorylation in the N-terminal domain and linking it to Rad53 activation kinetics.","evidence":"Mec1 IP-kinase assay, site mapping, and rfa1-S178A mutant analysis in yeast","pmids":["14642562"],"confidence":"Medium","gaps":["Functional consequence of S178 phosphorylation modest","Single-lab study"]},{"year":2005,"claim":"Demonstrated in vivo that RPA1 DNA-binding function suppresses chromosomal instability and tumorigenesis, with a dosage-sensitive role essential for embryogenesis.","evidence":"Mouse knock-in genetics, array CGH, MEF repair assays, and parallel yeast genetics","pmids":["15965476","15620706"],"confidence":"High","gaps":["Pathway by which mutant RPA1 drives rearrangements not fully defined","Checkpoint placement (ATM-Chk2 vs Chk1) from siRNA is single-lab"]},{"year":2008,"claim":"Genetically separated RPA1's two functional modules — ssDNA binding versus the N-terminal damage-response domain — showing replication and repair impose distinct structural requirements.","evidence":"Depletion/replacement with systematic domain mutagenesis and functional readouts in human cells","pmids":["18469000"],"confidence":"High","gaps":["Which damage-response partners require the N-terminus not enumerated here","Single rigorous study"]},{"year":2009,"claim":"Defined the RPA1 N-terminal OB-fold as the direct docking site for the MRN complex and showed RPA2 phosphorylation regulates this interaction during the damage response.","evidence":"Purified protein interaction assays, phosphomimetics, point/deletion mutagenesis, and cell-cycle analysis","pmids":["19586055"],"confidence":"Medium","gaps":["Single-lab interaction study","Downstream MRN-dependent processing not mapped"]},{"year":2011,"claim":"Showed the RPA70 N-terminal domain uses an overlapping surface to bind Rad9 and p53, druggable by a small molecule that blocks these interactions without affecting ssDNA binding.","evidence":"HTS, competitive GST-fusion binding assays, helix-destabilization assay, and docking","pmids":["21459001"],"confidence":"Medium","gaps":["Cellular efficacy of the inhibitor not established here","Single-lab biochemistry"]},{"year":2012,"claim":"Embedded RPA1 in checkpoint recruitment networks, showing it binds the Sgs1/BLM acidic domain to deliver Rad53 to stalled forks, and that p53-RPA70 dissociation in hypoxia frees RPA70 to enhance repair.","evidence":"Rpa70-binding site mapping on Sgs1 with Mec1/FHA1 assays; co-IP and p53 phosphosite mutagenesis with NER/NHEJ reporters","pmids":["22820947","22288499"],"confidence":"High","gaps":["Direct structural detail of Sgs1-Rpa70 contact limited","Hypoxia p53-RPA70 study single-lab"]},{"year":2015,"claim":"Revealed RPA1 protein abundance at forks is actively regulated, with PTEN recruiting OTUB1 to deubiquitinate and accumulate RPA1, preventing fork collapse.","evidence":"Co-IP, STORM, iPOND, ubiquitination assays, and knockout phenotyping","pmids":["26403191"],"confidence":"High","gaps":["Ubiquitin ligase opposing OTUB1 not identified here","Specific ubiquitination sites on RPA1 unmapped"]},{"year":2017,"claim":"Defined a writer/eraser-controlled acetylation code on RPA1, with PCAF/GCN5 K163 acetylation driving XPA recruitment in NER and HDAC6/SIRT1 reversing it.","evidence":"In vivo acetylation assays, K163 mutagenesis, NER and XPA-foci assays, and kinase/acetyltransferase activity assays; reported in two concurrent papers","pmids":["28854354","28854355"],"confidence":"High","gaps":["Stoichiometry and dynamics of K163 acetylation in vivo not quantified","Crosstalk with phosphorylation not addressed"]},{"year":2018,"claim":"Expanded RPA1 into transcriptional regulation and identified additional damage-response regulators, showing it converts NRF2 to a repressor and is held off ATR by Ajuba.","evidence":"Co-IP, ChIP, RNA-seq, reporter and vascular assays for NRF2; co-IP and depletion assays for Ajuba","pmids":["30309964","29934626"],"confidence":"Medium","gaps":["Both interactions single-lab","How RPA1 partitions between DNA-bound and transcriptional pools unknown"]},{"year":2020,"claim":"Established crotonylation as an HR-promoting modification on RPA1, controlled by CDYL and required for ssDNA and resection-machinery binding.","evidence":"Crotonylome proteomics, CDYL depletion, site mutagenesis, ssDNA binding and HR assays","pmids":["32201722"],"confidence":"Medium","gaps":["Single-lab PTM study","Crotonyltransferase writer not identified here"]},{"year":2022,"claim":"Demonstrated that hyperactive ssDNA binding by RPA1 is pathogenic, with germline gain-of-function variants causing telomere shortening and impaired hematopoiesis.","evidence":"Biochemical ssDNA/telomeric binding assays, CRISPR knock-in iPSCs, and somatic genetic rescue analysis","pmids":["34767620"],"confidence":"High","gaps":["Mechanism linking excess binding to telomere loss not fully resolved","Disease spectrum from these variants incompletely characterized"]},{"year":2022,"claim":"Identified RPA1 as a transcriptional/metabolic regulator in liver and as a target for a viral replication protein, broadening its non-replicative roles.","evidence":"Liver-specific Rpa1 knockout with ChIP and metabolic phenotyping; HBoV1 NP1 affinity/KD measurement and viral replication assay","pmids":["35830798","35653410"],"confidence":"Medium","gaps":["Mechanistic link between HNF4A co-activation and DNA-binding function unclear","Both studies single-lab"]},{"year":2023,"claim":"Showed that loss of RPA1 genome protection triggers innate-immune cell death and that fork-bound RPA1 must be cleared by UBQLN1 to sustain replication and telomere integrity.","evidence":"T cell-specific Rpa1 knockout with ZBP1-RIPK3 and necroptosis-rescue experiments; UBQLN1 co-IP, fork analysis, and telomere length assays","pmids":["36721037","37463174"],"confidence":"Medium","gaps":["Source/sensor link from RPA1 loss to cytosolic DNA not fully defined","UBQLN1 shuttling mechanism single-lab"]},{"year":2025,"claim":"Connected RPA1 to a lactylation modification and to developmental cell-death control, showing HAT1-mediated K88 lactylation promotes HR/radioresistance and Rpa1 loss drives cGAS-STING/ZBP1 PANoptosis.","evidence":"In vitro lactyltransferase assays, K88 mutagenesis, ssDNA/MRN binding and HR assays; limb-mesenchyme Rpa1 knockout with cGAS-STING/Z-DNA/PANoptosis analysis","pmids":["41271679","41694603","40834068"],"confidence":"Medium","gaps":["Lactylation studies from a single research group","How RPA1 loss generates Z-DNA not mechanistically resolved"]},{"year":2025,"claim":"Provided quantitative single-cell dynamics of RPA1 ssDNA loading at stalled forks and showed ATR/ATM differentially control RPA accumulation versus exhaustion.","evidence":"Live-cell PCNA/RPA1 reporter imaging with ATR/ATM/MRE11 inhibitors","pmids":["39859385"],"confidence":"Medium","gaps":["Molecular trigger of RPA exhaustion not defined","Single-lab imaging"]},{"year":null,"claim":"How RPA1 partitions among its many roles — replication, repair, recombination, checkpoint, transcription, and innate-immune cell-death suppression — and how its dense PTM code is integrated to direct each function remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating PTM writers/erasers with functional outcomes","Mechanism linking RPA1 loss to cytosolic/Z-DNA accumulation and innate immune sensing undefined","Structural basis for transcriptional (NRF2/HNF4A) versus DNA-binding functions unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,17,27]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[1,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10,12,18]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[24,28]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,24,28]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[22,27,33]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[0,3,22]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[1,10,23,26]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[11,14,16,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[24,28]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[29,30]}],"complexes":["RPA heterotrimer","MRN complex (interacting)","NRF2-RPA1 transcriptional complex"],"partners":["XPA","MRE11","NBS1","RAD52","TP53","HNF4A","NFE2L2","PTEN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P27694","full_name":"Replication protein A 70 kDa DNA-binding subunit","aliases":["Replication factor A protein 1","RF-A protein 1","Single-stranded DNA-binding protein"],"length_aa":616,"mass_kda":68.1,"function":"As part of the heterotrimeric replication protein A complex (RPA/RP-A), binds and stabilizes single-stranded DNA intermediates that form during DNA replication or upon DNA stress. It prevents their reannealing and in parallel, recruits and activates different proteins and complexes involved in DNA metabolism (PubMed:17596542, PubMed:27723717, PubMed:27723720). Thereby, it plays an essential role both in DNA replication and the cellular response to DNA damage (PubMed:9430682). In the cellular response to DNA damage, the RPA complex controls DNA repair and DNA damage checkpoint activation. Through recruitment of ATRIP activates the ATR kinase a master regulator of the DNA damage response (PubMed:24332808). It is required for the recruitment of the DNA double-strand break repair factors RAD51 and RAD52 to chromatin in response to DNA damage (PubMed:17765923). Also recruits to sites of DNA damage proteins like XPA and XPG that are involved in nucleotide excision repair and is required for this mechanism of DNA repair (PubMed:7697716). Also plays a role in base excision repair (BER) probably through interaction with UNG (PubMed:9765279). Also recruits SMARCAL1/HARP, which is involved in replication fork restart, to sites of DNA damage. Plays a role in telomere maintenance (PubMed:17959650, PubMed:34767620). As part of the alternative replication protein A complex, aRPA, binds single-stranded DNA and probably plays a role in DNA repair. Compared to the RPA2-containing, canonical RPA complex, may not support chromosomal DNA replication and cell cycle progression through S-phase. The aRPA may not promote efficient priming by DNA polymerase alpha but could support DNA synthesis by polymerase delta in presence of PCNA and replication factor C (RFC), the dual incision/excision reaction of nucleotide excision repair and RAD51-dependent strand exchange (PubMed:19996105). RPA stimulates 5'-3' helicase activity of the BRIP1/FANCJ (PubMed:17596542)","subcellular_location":"Nucleus; Nucleus, PML body","url":"https://www.uniprot.org/uniprotkb/P27694/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/RPA1","classification":"Common Essential","n_dependent_lines":1207,"n_total_lines":1208,"dependency_fraction":0.9991721854304636},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RPA1","total_profiled":1310},"omim":[{"mim_id":"619767","title":"PULMONARY FIBROSIS AND/OR BONE MARROW FAILURE SYNDROME, TELOMERE-RELATED, 6; PFBMFT6","url":"https://www.omim.org/entry/619767"},{"mim_id":"618030","title":"SHIELD COMPLEX, SUBUNIT 3; SHLD3","url":"https://www.omim.org/entry/618030"},{"mim_id":"618029","title":"SHIELD COMPLEX, SUBUNIT 2; SHLD2","url":"https://www.omim.org/entry/618029"},{"mim_id":"618028","title":"SHIELD COMPLEX, SUBUNIT 1; SHLD1","url":"https://www.omim.org/entry/618028"},{"mim_id":"617697","title":"LONG INTERGENIC NONCODING RNA 2747; LINC02747","url":"https://www.omim.org/entry/617697"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPA1"},"hgnc":{"alias_symbol":["REPA1","RPA70","HSSB","RF-A","RP-A"],"prev_symbol":[]},"alphafold":{"accession":"P27694","domains":[{"cath_id":"2.40.50.140","chopping":"10-118","consensus_level":"high","plddt":91.7837,"start":10,"end":118},{"cath_id":"2.40.50.140","chopping":"188-289","consensus_level":"high","plddt":91.2406,"start":188,"end":289},{"cath_id":"2.40.50.140","chopping":"306-427","consensus_level":"high","plddt":89.8921,"start":306,"end":427},{"cath_id":"2.40.50.140","chopping":"446-477_516-607","consensus_level":"high","plddt":91.7256,"start":446,"end":607}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P27694","model_url":"https://alphafold.ebi.ac.uk/files/AF-P27694-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P27694-F1-predicted_aligned_error_v6.png","plddt_mean":83.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPA1","jax_strain_url":"https://www.jax.org/strain/search?query=RPA1"},"sequence":{"accession":"P27694","fasta_url":"https://rest.uniprot.org/uniprotkb/P27694.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P27694/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P27694"}},"corpus_meta":[{"pmid":"9430655","id":"PMC_9430655","title":"NHE-RF, a regulatory cofactor for Na(+)-H+ exchange, is a common interactor for merlin and ERM (MERM) proteins.","date":"1998","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9430655","citation_count":206,"is_preprint":false},{"pmid":"2192864","id":"PMC_2192864","title":"An essential Saccharomyces cerevisiae single-stranded DNA binding protein is homologous to the large subunit of human RP-A.","date":"1990","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/2192864","citation_count":188,"is_preprint":false},{"pmid":"9539419","id":"PMC_9539419","title":"Genetic analysis of yeast RPA1 reveals its multiple functions in DNA metabolism.","date":"1998","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9539419","citation_count":166,"is_preprint":false},{"pmid":"1508673","id":"PMC_1508673","title":"A role for the human single-stranded DNA binding protein HSSB/RPA in an early stage of nucleotide excision repair.","date":"1992","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/1508673","citation_count":151,"is_preprint":false},{"pmid":"28436664","id":"PMC_28436664","title":"CPPred-RF: A Sequence-based Predictor for Identifying Cell-Penetrating Peptides and Their Uptake Efficiency.","date":"2017","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/28436664","citation_count":140,"is_preprint":false},{"pmid":"8308077","id":"PMC_8308077","title":"Distinct roles of cdk2 and cdc2 in RP-A phosphorylation during the cell cycle.","date":"1993","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/8308077","citation_count":132,"is_preprint":false},{"pmid":"15965476","id":"PMC_15965476","title":"Mutation in Rpa1 results in defective DNA double-strand break repair, chromosomal instability and cancer in mice.","date":"2005","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15965476","citation_count":127,"is_preprint":false},{"pmid":"18359806","id":"PMC_18359806","title":"Comparative genome analysis of \"Candidatus Phytoplasma australiense\" (subgroup tuf-Australia I; rp-A) and \"Ca. 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protein homologous to the 70 kDa subunit of human RP-A; loss of RPA1 causes accumulation of multiply-budded cells with a single nucleus, indicating a defect in DNA replication.\",\n      \"method\": \"Gene cloning, sequence homology analysis, tetrad analysis of heterozygous insertion mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined cellular phenotype, replicated across species, foundational study\",\n      \"pmids\": [\"2192864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"HSSB/RPA1 functions at an early stage of nucleotide excision repair (NER), prior to repair synthesis; anti-HSSB antibodies that inhibit DNA polymerase alpha stimulation also inhibit NER synthesis in cell-free extracts, and when damaged DNA is pre-incised by UvrABC the requirement for HSSB is bypassed, placing RPA1 upstream of the incision step.\",\n      \"method\": \"Cell-free NER assay with neutralizing antibodies; rescue by pre-incised substrate\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution with antibody inhibition and epistasis bypass experiment, defining pathway position\",\n      \"pmids\": [\"1508673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Bovine RP-A (RPA1/p70 subunit) directly interacts with the p48 subunit of DNA polymerase alpha-primase complex, as demonstrated by modified blotting (far-Western); bovine RP-A can substitute for human RP-A in SV40 DNA replication in vitro.\",\n      \"method\": \"Modified blotting (far-Western), in vitro SV40 replication assay\",\n      \"journal\": \"Chromosoma\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding by far-Western and functional in vitro reconstitution, single lab\",\n      \"pmids\": [\"1337880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"RP-A is essential for chromosomal DNA replication in Xenopus cell-free extracts (immunodepletion causes replication failure). During S phase, only nucleus-associated and single-stranded DNA-bound RPA is phosphorylated, and cdk2 is required for this S-phase phosphorylation indirectly (cdk2 depletion blocks replication before RPA binds ssDNA). At mitosis onset, cdc2 kinase directly phosphorylates RP-A independently of DNA binding.\",\n      \"method\": \"Immunodepletion from Xenopus extracts; immunoprecipitation-kinase assays with purified cdk2 and cdc2\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution in cell-free system plus purified kinase assays; multiple orthogonal methods distinguishing cdk2 vs cdc2 roles\",\n      \"pmids\": [\"8308077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The RPA70 (RPA1) subunit physically associates with the EBNA-2 acidic transactivation domain; a Trp-to-Thr mutation in EBNA-2 that abolishes transactivation also disrupts the EBNA-2–RPA70 interaction, genetically linking RPA70 binding to transcriptional activation.\",\n      \"method\": \"Co-immunoprecipitation/association assay; mutational analysis of EBNA-2\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct binding assay plus mutagenesis linking interaction to function, single lab\",\n      \"pmids\": [\"7983760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Cyclin A-Cdk2, but not cyclin E-Cdk2, efficiently phosphorylates the p34 subunit of HSSB (RPA2) in the heterotrimeric RPA complex; this differential phosphorylation is driven by a direct interaction between cyclin A and HSSB-p34, not cyclin E. The large subunit RPA70 (RPA1) is present in this complex.\",\n      \"method\": \"In vitro kinase assays with purified cyclin-Cdk2 complexes; direct binding assays between cyclin A/E and HSSB-p34\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins plus direct binding assays, mechanistic dissection of cyclin specificity\",\n      \"pmids\": [\"8798463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Transcription positive cofactor 4 (PC4), a ssDNA-binding protein, forms complexes with HSSB/RPA on ssDNA and inhibits RPA-dependent RNA primer synthesis and DNA polymerase delta-catalyzed chain elongation in SV40 replication; excess HSSB/RPA reverses these inhibitory effects.\",\n      \"method\": \"In vitro SV40 DNA replication assay; biochemical complex formation on ssDNA\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro replication system with defined biochemical interactions\",\n      \"pmids\": [\"8703021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Yeast RPA1 (RFA1) has multiple in vivo functions in DNA replication, repair, and recombination; specific missense mutations cause UV/MMS sensitivity and defects in mating-type switching and single-strand annealing recombination, while temperature-sensitive alleles arrest replication. Most mutations alter conserved residues also found in human and Xenopus RPA1.\",\n      \"method\": \"Genetic mutant screen; physical analysis of recombination intermediates; cell cycle analysis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — extensive genetic epistasis and molecular phenotyping across 19+ mutants; multiple orthogonal assays\",\n      \"pmids\": [\"9539419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human RPA (hSSB) directly interacts with EBNA1, the latent origin binding protein of EBV; the main contact is via the 70 kDa subunit (RPA1/RPA70), and this interaction occurs both in solution and when EBNA1 is bound to the EBV origin, suggesting RPA1 participates in latent EBV origin activation.\",\n      \"method\": \"Co-immunoprecipitation; binding assays in solution and on origin DNA\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — reciprocal binding assays with subunit mapping; single lab\",\n      \"pmids\": [\"9421526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"NMR structure of the N-terminal domain of RPA70 (residues 8–108) reveals a five-stranded anti-parallel beta-barrel with a large basic cleft formed by two loops; this cleft is the likely binding site for acidic motifs of transcriptional activators including p53. Lethal or conditional-lethal yeast point mutants map to this cleft.\",\n      \"method\": \"NMR global fold determination; mapping of known yeast mutants onto structure\",\n      \"journal\": \"Journal of biomolecular NMR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional validation via mapped yeast mutants\",\n      \"pmids\": [\"10526407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"XPA minimal DNA-binding domain contacts RPA70 (RPA1) residues spanning both the zinc-binding and loop-rich subdomains, with partial overlap with the DNA-binding surface, suggesting cooperative DNA-binding between XPA and RPA70 in NER. DNA binding by XPA is localized to the loop-rich subdomain regardless of lesion type.\",\n      \"method\": \"NMR chemical shift mapping; 15N relaxation studies of XPA-MBD bound to RPA70ΔC327\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR-based structure-function mapping of protein-protein and protein-DNA interactions\",\n      \"pmids\": [\"10563794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The N-terminal domain of Rpa1 (Rpa1N) physically interacts with Rfc4, a small subunit of replication factor C; rfa1 mutations in Rpa1N that confer hydroxyurea sensitivity are lethal when combined with rfc4-2. Both rfc4-2 and rfa1-t11 strains are defective in G2/M DNA damage checkpoint, and RFC4 is epistatic with RAD24 for DNA damage sensitivity, placing Rpa1N-Rfc4 interaction in checkpoint signaling.\",\n      \"method\": \"Genetic interaction (synthetic lethality), hydroxyurea/DNA damage sensitivity assays, checkpoint epistasis analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — allele-specific genetic interactions plus checkpoint epistasis in multiple pathways; replicated across multiple mutant combinations\",\n      \"pmids\": [\"11340166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human RPA forms a complex with Rad52 through two binding sites: the C-terminal domain of RPA32 (residues 224–271) and a newly identified domain on RPA70 (residues 169–326 of RPA1). Rad52 binding to RPA increases ssDNA affinity significantly; RPA binding to Rad52 inhibits higher-order self-association of Rad52 rings. DBD-D on RPA32 is primarily responsible for ssDNA-binding enhancement.\",\n      \"method\": \"Pulldown assays with defined protein fragments; ssDNA binding assays; analysis of Rad52 self-association\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping with multiple truncation constructs and functional ssDNA binding assays; single lab\",\n      \"pmids\": [\"12139939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human RPA70 (RPA1) C-terminal domain (residues 432–616) and the central domain of RPA32 (residues 39–180) interact with the 3'-end of a primer at a primer-template junction, as shown by photoaffinity labeling and limited proteolysis; this interaction is distinct from ssDNA binding.\",\n      \"method\": \"Photoaffinity crosslinking; limited proteolysis; domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct crosslinking with domain identification; single lab, two orthogonal methods\",\n      \"pmids\": [\"12600993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Yeast Mec1 kinase physically associates with RPA and phosphorylates both RPA1 and RPA2 in vitro; the major phosphorylation site on RPA1 maps to serine 178 in the N-terminal domain (RPA1N). The phosphorylation-defective rfa1-S178A mutant shows reduced physical interaction with Mec1 and altered kinetics of RPA1 and Rad53 phosphorylation in vivo.\",\n      \"method\": \"Mec1 immunoprecipitation-kinase assay; in vitro phosphorylation with site mapping; rfa1-S178A mutant phenotypic analysis\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay with site identification and in vivo validation; single lab\",\n      \"pmids\": [\"14642562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A heterozygous missense mutation in the DNA-binding domain of mouse Rpa1 causes defects in DNA double-strand break repair, chromosomal breaks, aneuploidy in primary MEFs, and leads to lymphoid tumors with large-scale chromosomal rearrangements. Homozygous mutation causes early embryonic lethality. The equivalent yeast mutation is hypomorphic, semidominant, and enhances gross chromosomal rearrangements.\",\n      \"method\": \"Mouse knock-in genetics; array CGH; MEF DNA repair assays; yeast genetic analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse and yeast genetics with multiple orthogonal phenotypic readouts; independent confirmation in two organisms\",\n      \"pmids\": [\"15965476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"siRNA knockdown of RPA1 in HeLa cells activates ATM (Ser1981) and Chk2 (Thr68) phosphorylation and upregulates p21, but not Chk1 (Ser345); ATM inhibitor caffeine and ATM siRNA both block Chk2 phosphorylation induced by RPA1 loss, placing RPA1 upstream of the ATM-Chk2 checkpoint axis.\",\n      \"method\": \"siRNA knockdown; immunoblotting for checkpoint kinase phosphorylation; ATM inhibitor and siRNA epistasis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with siRNA and chemical inhibitor; single lab, checkpoint pathway placement\",\n      \"pmids\": [\"15620706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RPA1 contains four structurally related OB-fold domains; mutations that substantially decrease ssDNA binding do not necessarily disrupt cellular function, while mutations that only slightly affect ssDNA binding can dramatically affect DNA repair and cell cycle progression. The N-terminus of RPA1 is dispensable for DNA replication but required for the cellular DNA damage response. Conserved aromatic residues in high-affinity ssDNA-binding domains are essential for DNA repair.\",\n      \"method\": \"Depletion/replacement strategy in human cells; site-directed mutagenesis of individual domains; functional readouts for replication, repair, and cell cycle\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic mutagenesis of all four domains with multiple functional readouts in human cells; single rigorous study\",\n      \"pmids\": [\"18469000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RPA1 N-terminal OB-fold domain directly interacts with MRN complex (MRE11 and NBS1); deletion of the N-terminal OB-fold or substitution of Arg31/Arg41 with alanines abrogates RPA-MRN interaction. RPA2 phosphorylation weakens the RPA-MRN interaction. Disruption of RPA-MRN binding alters cell cycle progression after DNA damage.\",\n      \"method\": \"Purified protein interaction assays; RPA2 phosphomimetic constructs; deletion and point mutagenesis of RPA1 N-terminus; cell cycle analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding with purified proteins plus mutagenesis and cell-based functional assay; single lab\",\n      \"pmids\": [\"19586055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RPA70 N-terminal domain (DBD) binds Rad9 and p53 peptides at an overlapping surface; small molecule NSC15520 competitively inhibits binding of both Rad9-GST and p53-GST to RPA70 N-terminal DBD with IC50 ~10 μM, and inhibits RPA70 N-terminal domain-dependent helix destabilization activity, without affecting ssDNA binding.\",\n      \"method\": \"High-throughput screening; competitive binding assays with GST-fusion proteins; DNA helix-destabilization assay; computational docking\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical binding assays with defined competitive inhibitor; single lab, multiple assays\",\n      \"pmids\": [\"21459001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sgs1 (BLM ortholog) N-terminal acidic domain (R1 domain) directly interacts with Rpa70 (Rpa1); deletion of R1 reduces Rad53 activation on hydroxyurea. Mec1 kinase phosphorylates the Sgs1 R1 domain, which promotes high-affinity binding to the Rad53 FHA1 domain, recruiting Rad53 to stalled forks for checkpoint activation.\",\n      \"method\": \"Identification and deletion of Rpa70-binding site on Sgs1; Mec1 kinase assay; FHA1 binding assay; epistasis with repair genes\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding assay, kinase assay, genetic epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"22820947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In hypoxia, DNA-PK phosphorylates p53 at Ser15, which dissociates the p53-RPA70 (RPA1) complex; free RPA70 then enhances NER/NHEJ repair, and RPA70 gene silencing significantly increases apoptosis in hypoxic cancer cells.\",\n      \"method\": \"Co-immunoprecipitation; site-directed mutagenesis of p53 Ser/Thr residues; RPA70 gene silencing; NER/NHEJ reporter assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with mutagenesis and functional silencing readout; single lab\",\n      \"pmids\": [\"22288499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PTEN physically associates with RPA1 via the RPA1 C-terminal domain; PTEN promotes RPA1 accumulation at replication forks (shown by iPOND) and recruits the deubiquitinase OTUB1 to mediate RPA1 deubiquitination. PTEN deletion leads to replication fork collapse, and RPA1 deletion phenocopies PTEN knockout in terms of fork stalling.\",\n      \"method\": \"Co-immunoprecipitation; STORM imaging; iPOND; ubiquitination assays; domain-mapping; knockout cell phenotyping\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, iPOND, STORM, ubiquitination assay); mechanistic pathway reconstruction in single rigorous study\",\n      \"pmids\": [\"26403191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PCAF/GCN5 acetyltransferases acetylate RPA1 at K163; this acetylation is required for NER but not for other repair pathways. Acetylation at K163 promotes stable XPA accumulation at UV-damaged DNA. DNA-PK phosphorylates and activates PCAF upon UV damage to drive RPA1 K163 acetylation. HDAC6 and SIRT1 deacetylate RPA1 K163, and UV causes HDAC6 cytoplasmic translocation, increasing RPA1 acetylation.\",\n      \"method\": \"In vivo acetylation assays; site-directed mutagenesis (K163); NER assays; XPA foci quantification; kinase and acetyltransferase activity assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — PTM identification with mutagenesis, writer/eraser identification, functional NER pathway placement; independently reported in two concurrent papers (PMID 28854354 and 28854355)\",\n      \"pmids\": [\"28854354\", \"28854355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RPA1 binds to NRF2 and competes with sMAF proteins for NRF2 binding; the NRF2-RPA1 complex binds a specific ARE-NRE sequence to repress transcription of target genes, converting NRF2 from a transcriptional activator to a repressor. This was shown to repress MYLK expression and disrupt vascular integrity.\",\n      \"method\": \"Co-immunoprecipitation; ChIP; RNA-seq; genome-wide ARE-NRE analysis; reporter assays; vascular permeability assays in lung injury model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, RNA-seq with functional in vivo validation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"30309964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LIM protein Ajuba directly and physically interacts with RPA70 (RPA1); this interaction is cell cycle-regulated and reduced upon DNA replication stress. Depletion of Ajuba leads to potent ATR activation, consistent with Ajuba acting as a negative regulator of ATR by occupying RPA70.\",\n      \"method\": \"Co-immunoprecipitation; direct binding assay; cell cycle synchronization; Ajuba depletion and ATR activation readouts\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct protein-protein interaction plus functional depletion assay; single lab\",\n      \"pmids\": [\"29934626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDYL negatively regulates crotonylation (Kcr) of RPA1; mutation of RPA1 crotonylation sites impairs its interaction with single-stranded DNA and with components of the DNA resection machinery, demonstrating that RPA1 Kcr is required for homologous recombination DNA repair.\",\n      \"method\": \"Quantitative proteomics crotonylome; CDYL depletion; site mutagenesis; ssDNA binding assay; HR repair assay\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics-driven PTM identification with mutagenesis and functional binding/repair assays; single lab\",\n      \"pmids\": [\"32201722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Gain-of-function germline missense variants in RPA1 (E240K and V227A) in DNA-binding domain A cause increased binding to single-stranded and telomeric DNA, leading to severe telomere shortening and impaired hematopoietic differentiation. CRISPR/Cas9 knock-in of RPA1E240K in iPSCs recapitulates telomere shortening, establishing that hyperactive ssDNA binding by RPA1 disrupts telomere maintenance.\",\n      \"method\": \"Biochemical ssDNA/telomeric DNA binding assays; CRISPR/Cas9 knock-in; iPSC hematopoietic differentiation; somatic genetic rescue analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical gain-of-function characterization, CRISPR cellular model, and patient-derived somatic rescue; multiple orthogonal methods\",\n      \"pmids\": [\"34767620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RPA1 binds gene regulatory regions, chromatin-remodeling factors, and HNF4A in liver cells; RPA1 promotes HNF4A transcriptional activity and fatty acid β-oxidation. Liver-specific deletion of Rpa1 in mice causes downregulation of fatty acid oxidation genes, hepatic steatosis, and hepatocellular carcinoma. Rpa1+/- mice develop fatty liver during aging and on high-fat diet.\",\n      \"method\": \"Conditional liver-specific Rpa1 knockout; ChIP; chromatin remodeling factor interaction assays; gene expression analysis; metabolic phenotyping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with chromatin binding and functional metabolic readouts; single lab\",\n      \"pmids\": [\"35830798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"T cell-specific deletion of Rpa1 (Rpa1fl/fl Cd4-cre mice) causes peripheral T cell lymphopenia and reduced TCR repertoire diversity. Mechanistically, RPA1 depletion causes genomic DNA leakage into the cytosol, activating ZBP1-RIPK3 signaling and T cell necroptosis; chemical or genetic inhibition of necroptosis rescues the phenotype.\",\n      \"method\": \"Conditional T cell-specific Rpa1 knockout; ZBP1-RIPK3 pathway analysis; cytosolic DNA detection; necroptosis inhibition rescue experiments\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with mechanistic pathway identification and rescue; single lab\",\n      \"pmids\": [\"36721037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Conditional knockout of Rpa1 in limb bud mesenchyme causes near-total absence of forelimbs; mechanistically, Rpa1 deletion leads to extensive DNA damage, activates the cGAS-STING pathway driving Zbp1 transcription, and causes Z-DNA accumulation that activates ZBP1-dependent PANoptosis (combined apoptosis, necroptosis, pyroptosis) in mesenchymal stem cells.\",\n      \"method\": \"Conditional Rpa1 knockout in limb mesenchyme; cGAS-STING pathway assays; Z-DNA immunostaining; PANoptosis markers; genetic epistasis with ZBP1\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional genetic KO with mechanistic pathway dissection; single lab but multiple orthogonal assays\",\n      \"pmids\": [\"40834068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HAT1 acts as a lactyltransferase that directly catalyzes lactylation of RPA1 at K88 (and K15 of RPA1 in lung adenocarcinoma study); RPA1 lactylation at K88 facilitates RPA1 binding to ssDNA and to MRN complexes, promotes homologous recombination, and confers radioresistance. HAT1 knockout inhibits DNA repair and increases radiosensitivity.\",\n      \"method\": \"In vitro lactyltransferase assay; site-directed mutagenesis (K88); ssDNA binding assay; MRN co-immunoprecipitation; HR repair assay; HAT1 KO in vitro and in vivo\",\n      \"journal\": \"Cell death & disease / International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM identification with mutagenesis and functional binding/repair assays; two papers reporting same mechanism, single research group\",\n      \"pmids\": [\"41271679\", \"41694603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Live-cell imaging reveals that RPA1 accumulates on ssDNA at stalled replication forks (up to ~2400 nt per fork) during nucleotide depletion; ATR inhibition accelerates RPA1 accumulation ~9-fold leading to RPA exhaustion, while ATM inhibition with ATR inhibition causes persistence of ~2500 nt ssDNA per fork post-S-phase and mitotic catastrophe. MRE11 inhibition does not affect PCNA/RPA1 dynamics.\",\n      \"method\": \"Live-cell fluorescence microscopy (PCNA/RPA1 reporters); single-cell tracking at 30-second resolution; ATR/ATM inhibitors; MRE11 inhibition\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative live imaging with defined inhibitor perturbations; single lab, novel temporal resolution\",\n      \"pmids\": [\"39859385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"UBQLN1 interacts with RPA1 and shuttles it off the replication fork; UBQLN1 deficiency retains RPA1 at replication forks, hinders replication, and causes cell cycle arrest, genome instability, and rapid telomere shortening (particularly at G-rich telomeric sequences). This leads to lung fibrosis in mice.\",\n      \"method\": \"Co-immunoprecipitation; replication fork analysis; telomere length assay; UBQLN1 depletion in cells and mice\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein interaction with functional replication and telomere phenotype; single lab\",\n      \"pmids\": [\"37463174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDC20 stabilizes RPA1 protein through direct protein-protein interaction in early stages of DNA damage, activating ATR-mediated signaling; in later stages, CDC20 promotes ubiquitin-mediated degradation of RPA1 to complete DNA repair. CDC20 promotes homologous recombination and radioresistance.\",\n      \"method\": \"Co-immunoprecipitation; HR and NHEJ reporter systems; ubiquitination assay; tumor xenograft\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with reporter assay; mechanism proposed but limited biochemical validation of ubiquitination specificity\",\n      \"pmids\": [\"39125953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HBoV1 NP1 protein directly interacts with RPA70 (RPA1) at domain aa181–422 with high affinity (KD ~122 nM); this NP1-RPA70 interaction is required for HBoV1 DNA replication in vitro and in infected human airway epithelium cultures.\",\n      \"method\": \"Affinity purification; equilibrium dissociation constant measurement; domain mapping; dominant-negative strategy in viral DNA replication assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding with KD measurement, domain mapping, and functional viral replication assay; single lab\",\n      \"pmids\": [\"35653410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP49 deubiquitinase, recruited to DNA DSBs via ATM-promoted liquid-liquid phase separation, deubiquitinates and stabilizes RPA70 (RPA1) at DSBs along with Rad51, thereby promoting homologous recombination repair and radioresistance.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination/deubiquitination assay; LLPS analysis; HR reporter; tumor xenograft\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, Co-IP plus functional assay; deubiquitination of RPA1 by USP49 shown but limited mechanistic detail on specific ubiquitination sites\",\n      \"pmids\": [\"40460957\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPA1 (RPA70) is the large subunit of the heterotrimeric replication protein A complex that serves as the primary eukaryotic single-stranded DNA (ssDNA) binding protein; it is essential for DNA replication (where cdc2 directly phosphorylates it at mitosis and cdk2 indirectly activates it during S phase), nucleotide excision repair (via K163 acetylation by PCAF/GCN5 that promotes XPA recruitment and is reversed by HDAC6), homologous recombination (via crotonylation and lactylation that modulate ssDNA and MRN complex binding), and DNA damage checkpoint signaling (through its N-terminal OB-fold domain that interacts with Rfc4, MRN, Mec1/ATR, and Rad53/Chk2); RPA1 also forms a repressive NRF2-RPA1 transcriptional complex, controls chromatin accessibility and HNF4A activity in liver, and protects genomic integrity during embryogenesis and T cell homeostasis through the ZBP1-RIPK3 necroptosis axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPA1 (RPA70) is the large subunit of the heterotrimeric single-stranded DNA-binding protein RPA and is an essential, evolutionarily conserved factor required for chromosomal DNA replication, with loss-of-function causing replication failure in yeast and immunodepletion blocking replication in Xenopus extracts [#0, #3]. Its four OB-fold domains separate two genetically distinct activities: high-affinity ssDNA binding through internal DNA-binding domains and a protein-interaction hub in the N-terminal OB-fold domain that is dispensable for replication but required for the DNA damage response [#17]. Through this architecture RPA1 directly engages the replication and repair machinery — the DNA polymerase alpha-primase p48 subunit, primer-template junctions, XPA in nucleotide excision repair, and Rad52 in recombination — and acts at an early, pre-incision step of NER [#1, #2, #10, #12, #13]. The N-terminal domain coordinates checkpoint signaling by binding Rfc4, the MRN complex (MRE11/NBS1), and the ATR/Mec1 and Rad53/Chk2 apparatus, and RPA1 depletion activates the ATM-Chk2 axis [#11, #14, #16, #18]. RPA1 function is tuned by writer/eraser-controlled post-translational modifications: cell-cycle phosphorylation by cdc2 and cyclin/Cdk2 kinases, PCAF/GCN5-mediated K163 acetylation (reversed by HDAC6/SIRT1) that drives XPA recruitment in NER, and CDYL-regulated crotonylation and HAT1-catalyzed K88 lactylation that promote ssDNA and MRN binding during homologous recombination [#3, #5, #23, #26, #31]. Beyond genome maintenance, RPA1 acts in transcriptional control, converting NRF2 into a repressor at ARE-NRE elements and promoting HNF4A activity and fatty-acid oxidation in liver, where its loss causes hepatic steatosis and hepatocellular carcinoma [#24, #28]. In vivo, Rpa1 protects genomic integrity during development and immune homeostasis: deletion triggers cytosolic DNA leakage and ZBP1-RIPK3 necroptosis in T cells and cGAS-STING/ZBP1-driven PANoptosis in limb mesenchyme [#29, #30]. Germline gain-of-function variants in DNA-binding domain A that hyperactivate ssDNA/telomeric binding cause severe telomere shortening and impaired hematopoiesis [#27].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established that RPA1 is an essential single-stranded DNA-binding protein required for DNA replication, defining its core cellular function.\",\n      \"evidence\": \"Gene cloning, homology analysis, and tetrad analysis of loss-of-function mutants in S. cerevisiae\",\n      \"pmids\": [\"2192864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of how ssDNA binding supports replication not yet defined\", \"No biochemical reconstitution of the full complex\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Placed RPA1 upstream of incision in nucleotide excision repair and physically linked it to the polymerase alpha-primase machinery, showing it functions beyond replication.\",\n      \"evidence\": \"Cell-free NER assays with neutralizing antibodies and pre-incised substrate bypass; far-Western binding to pol alpha-primase p48\",\n      \"pmids\": [\"1508673\", \"1337880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise structural basis of NER role unresolved\", \"Single-lab far-Western for p48 interaction\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Resolved how RPA1 is cell-cycle regulated, distinguishing direct cdc2 phosphorylation at mitosis from indirect cdk2-dependent S-phase phosphorylation.\",\n      \"evidence\": \"Immunodepletion of Xenopus extracts and immunoprecipitation-kinase assays with purified cdk2 and cdc2\",\n      \"pmids\": [\"8308077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of each phosphorylation event not fully defined\", \"Subunit specificity of phosphorylation incomplete\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Clarified that cyclin A-Cdk2, not cyclin E-Cdk2, phosphorylates the RPA complex via direct cyclin A docking, refining the kinase specificity of RPA regulation.\",\n      \"evidence\": \"In vitro kinase and direct binding assays with purified cyclin-Cdk2 complexes\",\n      \"pmids\": [\"8798463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation maps mainly to RPA2 p34, not RPA1 directly\", \"In vivo relevance not tested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated genetically and physically that RPA1 functions in replication, repair, and recombination, and that it binds viral origin proteins via the RPA70 subunit.\",\n      \"evidence\": \"Yeast missense/ts mutant screen with recombination intermediate analysis; co-IP mapping of EBNA1 to RPA70\",\n      \"pmids\": [\"9539419\", \"9421526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing repair vs recombination defects unresolved\", \"Viral origin interaction studies single lab\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Provided structural basis for RPA1 protein-interaction function, revealing an N-terminal OB-fold beta-barrel with a basic cleft that binds acidic activator motifs and a cooperative XPA-binding surface for NER.\",\n      \"evidence\": \"NMR fold determination of RPA70 N-terminal domain; NMR chemical-shift mapping of XPA-MBD on RPA70\",\n      \"pmids\": [\"10526407\", \"10563794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length complex structure not resolved\", \"How cleft selects among competing acidic partners unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped a Rad52-binding domain on RPA1 and showed RPA-Rad52 interplay tunes ssDNA affinity and Rad52 oligomerization, linking RPA1 to recombination mechanics.\",\n      \"evidence\": \"Pulldown domain mapping and ssDNA-binding/self-association assays\",\n      \"pmids\": [\"12139939\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab domain mapping\", \"In vivo recombination contribution of this domain not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified a distinct primer-template junction recognition activity in the RPA70 C-terminal domain, separating junction binding from generic ssDNA binding.\",\n      \"evidence\": \"Photoaffinity crosslinking and limited proteolysis domain mapping\",\n      \"pmids\": [\"12600993\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role at forks not directly tested\", \"Single-lab crosslinking\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Connected the RPA1 N-terminal domain to checkpoint signaling through an allele-specific genetic interaction with Rfc4 in the DNA damage checkpoint.\",\n      \"evidence\": \"Synthetic lethality, HU/damage sensitivity, and checkpoint epistasis in yeast\",\n      \"pmids\": [\"11340166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical Rpa1N-Rfc4 contact not biochemically resolved\", \"Mechanism of checkpoint signal transfer unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established Mec1/ATR as a kinase acting on RPA1, mapping S178 phosphorylation in the N-terminal domain and linking it to Rad53 activation kinetics.\",\n      \"evidence\": \"Mec1 IP-kinase assay, site mapping, and rfa1-S178A mutant analysis in yeast\",\n      \"pmids\": [\"14642562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of S178 phosphorylation modest\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated in vivo that RPA1 DNA-binding function suppresses chromosomal instability and tumorigenesis, with a dosage-sensitive role essential for embryogenesis.\",\n      \"evidence\": \"Mouse knock-in genetics, array CGH, MEF repair assays, and parallel yeast genetics\",\n      \"pmids\": [\"15965476\", \"15620706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Pathway by which mutant RPA1 drives rearrangements not fully defined\", \"Checkpoint placement (ATM-Chk2 vs Chk1) from siRNA is single-lab\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetically separated RPA1's two functional modules — ssDNA binding versus the N-terminal damage-response domain — showing replication and repair impose distinct structural requirements.\",\n      \"evidence\": \"Depletion/replacement with systematic domain mutagenesis and functional readouts in human cells\",\n      \"pmids\": [\"18469000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which damage-response partners require the N-terminus not enumerated here\", \"Single rigorous study\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the RPA1 N-terminal OB-fold as the direct docking site for the MRN complex and showed RPA2 phosphorylation regulates this interaction during the damage response.\",\n      \"evidence\": \"Purified protein interaction assays, phosphomimetics, point/deletion mutagenesis, and cell-cycle analysis\",\n      \"pmids\": [\"19586055\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interaction study\", \"Downstream MRN-dependent processing not mapped\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed the RPA70 N-terminal domain uses an overlapping surface to bind Rad9 and p53, druggable by a small molecule that blocks these interactions without affecting ssDNA binding.\",\n      \"evidence\": \"HTS, competitive GST-fusion binding assays, helix-destabilization assay, and docking\",\n      \"pmids\": [\"21459001\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cellular efficacy of the inhibitor not established here\", \"Single-lab biochemistry\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Embedded RPA1 in checkpoint recruitment networks, showing it binds the Sgs1/BLM acidic domain to deliver Rad53 to stalled forks, and that p53-RPA70 dissociation in hypoxia frees RPA70 to enhance repair.\",\n      \"evidence\": \"Rpa70-binding site mapping on Sgs1 with Mec1/FHA1 assays; co-IP and p53 phosphosite mutagenesis with NER/NHEJ reporters\",\n      \"pmids\": [\"22820947\", \"22288499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct structural detail of Sgs1-Rpa70 contact limited\", \"Hypoxia p53-RPA70 study single-lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed RPA1 protein abundance at forks is actively regulated, with PTEN recruiting OTUB1 to deubiquitinate and accumulate RPA1, preventing fork collapse.\",\n      \"evidence\": \"Co-IP, STORM, iPOND, ubiquitination assays, and knockout phenotyping\",\n      \"pmids\": [\"26403191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase opposing OTUB1 not identified here\", \"Specific ubiquitination sites on RPA1 unmapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a writer/eraser-controlled acetylation code on RPA1, with PCAF/GCN5 K163 acetylation driving XPA recruitment in NER and HDAC6/SIRT1 reversing it.\",\n      \"evidence\": \"In vivo acetylation assays, K163 mutagenesis, NER and XPA-foci assays, and kinase/acetyltransferase activity assays; reported in two concurrent papers\",\n      \"pmids\": [\"28854354\", \"28854355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics of K163 acetylation in vivo not quantified\", \"Crosstalk with phosphorylation not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Expanded RPA1 into transcriptional regulation and identified additional damage-response regulators, showing it converts NRF2 to a repressor and is held off ATR by Ajuba.\",\n      \"evidence\": \"Co-IP, ChIP, RNA-seq, reporter and vascular assays for NRF2; co-IP and depletion assays for Ajuba\",\n      \"pmids\": [\"30309964\", \"29934626\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Both interactions single-lab\", \"How RPA1 partitions between DNA-bound and transcriptional pools unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established crotonylation as an HR-promoting modification on RPA1, controlled by CDYL and required for ssDNA and resection-machinery binding.\",\n      \"evidence\": \"Crotonylome proteomics, CDYL depletion, site mutagenesis, ssDNA binding and HR assays\",\n      \"pmids\": [\"32201722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab PTM study\", \"Crotonyltransferase writer not identified here\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated that hyperactive ssDNA binding by RPA1 is pathogenic, with germline gain-of-function variants causing telomere shortening and impaired hematopoiesis.\",\n      \"evidence\": \"Biochemical ssDNA/telomeric binding assays, CRISPR knock-in iPSCs, and somatic genetic rescue analysis\",\n      \"pmids\": [\"34767620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking excess binding to telomere loss not fully resolved\", \"Disease spectrum from these variants incompletely characterized\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified RPA1 as a transcriptional/metabolic regulator in liver and as a target for a viral replication protein, broadening its non-replicative roles.\",\n      \"evidence\": \"Liver-specific Rpa1 knockout with ChIP and metabolic phenotyping; HBoV1 NP1 affinity/KD measurement and viral replication assay\",\n      \"pmids\": [\"35830798\", \"35653410\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between HNF4A co-activation and DNA-binding function unclear\", \"Both studies single-lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed that loss of RPA1 genome protection triggers innate-immune cell death and that fork-bound RPA1 must be cleared by UBQLN1 to sustain replication and telomere integrity.\",\n      \"evidence\": \"T cell-specific Rpa1 knockout with ZBP1-RIPK3 and necroptosis-rescue experiments; UBQLN1 co-IP, fork analysis, and telomere length assays\",\n      \"pmids\": [\"36721037\", \"37463174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Source/sensor link from RPA1 loss to cytosolic DNA not fully defined\", \"UBQLN1 shuttling mechanism single-lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected RPA1 to a lactylation modification and to developmental cell-death control, showing HAT1-mediated K88 lactylation promotes HR/radioresistance and Rpa1 loss drives cGAS-STING/ZBP1 PANoptosis.\",\n      \"evidence\": \"In vitro lactyltransferase assays, K88 mutagenesis, ssDNA/MRN binding and HR assays; limb-mesenchyme Rpa1 knockout with cGAS-STING/Z-DNA/PANoptosis analysis\",\n      \"pmids\": [\"41271679\", \"41694603\", \"40834068\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Lactylation studies from a single research group\", \"How RPA1 loss generates Z-DNA not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided quantitative single-cell dynamics of RPA1 ssDNA loading at stalled forks and showed ATR/ATM differentially control RPA accumulation versus exhaustion.\",\n      \"evidence\": \"Live-cell PCNA/RPA1 reporter imaging with ATR/ATM/MRE11 inhibitors\",\n      \"pmids\": [\"39859385\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular trigger of RPA exhaustion not defined\", \"Single-lab imaging\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RPA1 partitions among its many roles — replication, repair, recombination, checkpoint, transcription, and innate-immune cell-death suppression — and how its dense PTM code is integrated to direct each function remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating PTM writers/erasers with functional outcomes\", \"Mechanism linking RPA1 loss to cytosolic/Z-DNA accumulation and innate immune sensing undefined\", \"Structural basis for transcriptional (NRF2/HNF4A) versus DNA-binding functions unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 17, 27]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [1, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10, 12, 18]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [24, 28]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 24, 28]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [22, 27, 33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [0, 3, 22]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [1, 10, 23, 26]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [11, 14, 16, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [24, 28]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [29, 30]}\n    ],\n    \"complexes\": [\"RPA heterotrimer\", \"MRN complex (interacting)\", \"NRF2-RPA1 transcriptional complex\"],\n    \"partners\": [\"XPA\", \"MRE11\", \"NBS1\", \"RAD52\", \"TP53\", \"HNF4A\", \"NFE2L2\", \"PTEN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}