{"gene":"HLTF","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2008,"finding":"HLTF functions as an E3 ubiquitin ligase that promotes Lys-63-linked polyubiquitination of PCNA at Lys-164, interacting physically with the Rad6-Rad18 and Mms2-Ubc13 ubiquitin-conjugating enzyme complexes to enable error-free postreplication repair of damaged DNA.","method":"In vitro ubiquitin ligase assay, co-immunoprecipitation, complementation of rad5Δ yeast strain, UV sensitivity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay plus Co-IP plus genetic complementation, replicated independently in two PNAS papers same year (PMIDs 18316726 and 18719106)","pmids":["18316726","18719106"],"is_preprint":false},{"year":2009,"finding":"HLTF possesses ATP-dependent double-stranded DNA translocase activity that enables replication fork reversal (regression of model replication forks), and promotes restart of replication forks blocked at DNA lesions in vivo.","method":"In vitro fork reversal assay with ATPase-deficient mutants, chromosomal fiber analysis of dually labeled replication tracks","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro biochemical reconstitution plus mutagenesis plus in vivo fiber analysis; replicated in subsequent studies","pmids":["19948885"],"is_preprint":false},{"year":2011,"finding":"HLTF has an ATP hydrolysis-dependent protein remodeling activity that removes DNA-binding proteins (RPA, PCNA, RFC) from stalled replication forks, thereby clearing access for damage bypass factors.","method":"In vitro protein displacement assay with purified components, ATPase-deficient mutant analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro with purified proteins and ATPase mutant controls, single lab but multiple substrates tested orthogonally","pmids":["21795603"],"is_preprint":false},{"year":2011,"finding":"Following UV damage, HLTF enhances PCNA monoubiquitination and recruitment of TLS polymerase η while inhibiting SHPRH; following MMS damage, HLTF is degraded, allowing SHPRH to interact with Rad18 and polymerase κ. Thus HLTF and SHPRH act in a damage-specific manner to coordinate different branches of postreplication repair.","method":"siRNA knockdown, co-immunoprecipitation, mutagenesis assays, immunofluorescence of TLS polymerase recruitment","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, genetic knockdown with defined pathway phenotypes, multiple orthogonal methods in single lab","pmids":["21396873"],"is_preprint":false},{"year":2013,"finding":"HLTF can form a D-loop (strand invasion) in a RAD51-independent manner without requiring ATP binding/hydrolysis; the 3' end of the invading strand in the D-loop can serve as a primer for DNA polymerase extension, providing a template-switch mechanism for gap repair.","method":"In vitro D-loop formation assay with purified proteins, ATPase-deficient mutants, primer extension assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical reconstitution with purified components and ATPase/ATP-binding mutants, single lab but multiple orthogonal assays","pmids":["24198246"],"is_preprint":false},{"year":2015,"finding":"The HIRAN domain of HLTF is an OB-fold structure that specifically binds 3' ssDNA ends; this interaction recruits HLTF to stalled replication forks and drives fork reversal activity. HIRAN domain mutations abolish fork reversal in vitro and replication fork slowing in cells.","method":"Crystal structure of HIRAN-DNA complex, biochemical 3'-ssDNA binding assays, HIRAN mutant fork reversal assays in vitro, replication fork progression assays in cells","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis plus cellular phenotype, independently confirmed by two papers same year (PMIDs 26051180 and 25858588)","pmids":["26051180","25858588"],"is_preprint":false},{"year":2015,"finding":"HIRAN domain mutant HLTF retains ubiquitin ligase, ATPase, and dsDNA translocase activities but is specifically impaired in binding model replication fork structures, demonstrating that the HIRAN domain recruits HLTF to stalled forks and provides directional guidance for the translocase motor during fork reversal.","method":"HIRAN domain mutagenesis, in vitro fork binding and reversal assays, ATPase assays, ubiquitin ligase assays, cellular postreplication repair gap-filling assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical assays with domain mutants plus cellular functional readout, single lab","pmids":["26350214"],"is_preprint":false},{"year":2016,"finding":"HIV-1 Vpr subverts the DCAF1 adaptor of the CRL4A E3 ubiquitin ligase to trigger proteasomal degradation of HLTF in T cells and macrophages; this degradation occurs independently of Vpr-mediated G2 arrest.","method":"Quantitative proteomic screen, Western blot degradation assay, proteasome inhibitor rescue, HIV-1 infection experiments in primary T cells and macrophages","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — unbiased proteomics plus mechanistic validation plus primary cell infection, replicated by independent lab (PMID 27335459)","pmids":["27114546","27335459"],"is_preprint":false},{"year":2017,"finding":"HIV-1 Vpr directly loads HLTF onto the WD40 domain of DCAF1 within the CRL4 E3 ubiquitin ligase, mediating HLTF polyubiquitination. Vpr interacts with DNA-binding residues in HLTF's HIRAN domain and a second region connecting HIRAN to the ATPase/helicase domains.","method":"In vitro reconstitution of Vpr-dependent HLTF polyubiquitination, mutational analysis of HIRAN domain interaction interface","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro ubiquitination with purified components plus structure-guided mutagenesis, single lab","pmids":["29079575"],"is_preprint":false},{"year":2019,"finding":"HLTF restricts HIV-1 replication in activated primary CD4+ T cells; this restriction is antagonized by HIV-1 Vpr via CRL4-DCAF1-dependent degradation of HLTF.","method":"Pairwise HIV-1 replication competition assay, HLTF knockdown, Vpr separation-of-function mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic competition assay with Vpr mutants and HLTF knockdown, single lab, two orthogonal approaches","pmids":["31019079"],"is_preprint":false},{"year":2011,"finding":"USP7 (ubiquitin-specific protease 7) interacts with HLTF and stabilizes it after genotoxic stress by deubiquitination, prolonging HLTF half-life and thereby increasing PCNA polyubiquitination.","method":"Co-immunoprecipitation, ubiquitination assay, half-life/stability assay, siRNA knockdown with PCNA ubiquitination readout","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus deubiquitination assay plus functional PCNA ubiquitination readout, single lab","pmids":["21845734"],"is_preprint":false},{"year":2010,"finding":"CHFR E3 ubiquitin ligase binds to and ubiquitinates HLTF, leading to its proteasomal degradation; HLTF modulates basal expression of PAI-1, and CHFR-mediated HLTF degradation reduces PAI-1 expression and inhibits cell migration.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, cell migration assay, PAI-1 expression analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus in vitro ubiquitination plus functional migration assay, single lab","pmids":["20388495"],"is_preprint":false},{"year":2009,"finding":"HLTF has intrinsic ATPase activity and E3 ubiquitin ligase activity with a range of E2 ubiquitin-conjugating enzymes in vitro. PTIP and RPA70 were identified as HLTF-interacting proteins.","method":"In vitro ATPase assay, in vitro ubiquitin ligase assay, co-immunoprecipitation/pulldown","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro enzymatic assays plus pulldown, single lab, limited follow-up","pmids":["19723507"],"is_preprint":false},{"year":2020,"finding":"In HLTF-deficient cells, replication forks fail to undergo reversal following replication stress and instead rely on PRIMPOL for repriming and unrestrained replication. In HLTF-HIRAN mutant cells, unrestrained replication depends on REV1 (TLS). HLTF-deficient cells show reduced DSB formation and increased survival under replication stress.","method":"HLTF knockout/HIRAN mutant cells, electron microscopy of fork structures, PRIMPOL and REV1 epistasis analysis, DNA fiber assay, DSB quantification","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — EM visualization of fork structures plus genetic epistasis with multiple mutants plus fiber analysis, single lab but multiple orthogonal methods","pmids":["32442397"],"is_preprint":false},{"year":2022,"finding":"HLTF is recruited to the NER incision complex in a dual-incision-dependent manner via its HIRAN domain binding to 3'-OH single-stranded DNA ends; HLTF's translocase motor then promotes dissociation of the incision complex together with the incised oligonucleotide, enabling efficient PCNA loading and repair synthesis.","method":"In vitro NER reconstitution, HLTF recruitment assay, HIRAN domain mutant analysis, PCNA loading assay, cellular NER kinetics","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — reconstituted NER system plus HIRAN mutant analysis plus cellular repair assays, single lab but multiple orthogonal methods","pmids":["35271816"],"is_preprint":false},{"year":2016,"finding":"Solution NMR structure of the human HLTF HIRAN domain reveals an OB-like fold; the free domain exhibits conformational heterogeneity at its DNA-binding site. Sequence comparison suggests SHPRH N-terminus contains an uncharacterized structured module with weak HIRAN similarity.","method":"Solution NMR structure determination","journal":"Journal of biomolecular NMR","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structure of free domain only, no functional mutagenesis validation in this paper","pmids":["27771863"],"is_preprint":false},{"year":2018,"finding":"HLTF ligase activity is stimulated by double-stranded DNA via HIRAN domain-dependent recruitment to stalled primer ends; RFC and PCNA at primer ends suppress en bloc PCNA polyubiquitination, redirecting to sequential chain elongation. When PCNA is monoubiquitinated by RAD6-RAD18 in the presence of HLTF, the ubiquitin is immediately polyubiquitinated by HLTF (coupled reaction).","method":"In vitro ubiquitin ligase assay with reconstituted components, HIRAN mutant analysis, RFC/PCNA competition assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro assay with purified components and domain mutants testing multiple mechanistic steps, single lab","pmids":["30335157"],"is_preprint":false},{"year":2020,"finding":"HLTF and SHPRH contain functional APIM (AlkB homologue 2 PCNA-interacting motif) sequences that mediate direct binding to PCNA; HLTF's role in TLS in overexpressing cells and nuclear localization of SHPRH depend on APIM-PCNA interaction. APIM mutation in HLTF alters mutation spectra, decreasing C-to-T transitions after UV.","method":"APIM mutant analysis, nuclear localization assay, mutagenesis (SupF) assay, PCNA binding assay","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional mutant analysis with cellular readouts, single lab, multiple assays","pmids":["31973093"],"is_preprint":false},{"year":2013,"finding":"In pituitary lactotrope cells, HLTF (SMARCA3) binds the prolactin promoter E-box and interacts with the pituitary-specific factor PIT-1; NONO and SFPQ are HLTF-associated proteins identified by mass spectrometry that bind rhythmically to the prolactin promoter and regulate circadian prolactin transcription. NONO/SFPQ overexpression reduces Prl promoter activity and disrupts circadian pattern.","method":"Chromatin immunoprecipitation, mass spectrometry identification of HLTF-associated proteins, co-immunoprecipitation, promoter reporter assays, overexpression studies","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — ChIP plus MS identification plus functional reporter assays, single lab","pmids":["21507896"],"is_preprint":false},{"year":2013,"finding":"SMARCA3/HLTF is a target of the p11/annexin A2 heterotetrameric complex; crystal structure shows SMARCA3 peptide binds a hydrophobic pocket in the heterotetramer; complex formation increases SMARCA3 DNA-binding affinity and its localization to the nuclear matrix fraction. SSRI-induced neurogenesis and behavioral responses are abolished by constitutive SMARCA3 knockout.","method":"Crystal structure of SMARCA3 peptide-heterotetramer complex, DNA-binding affinity assay, nuclear fractionation, SMARCA3 knockout behavioral/neurogenesis assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — crystal structure plus biochemical binding assay plus nuclear fractionation plus KO phenotype, multiple orthogonal methods","pmids":["23415230"],"is_preprint":false},{"year":2021,"finding":"The p11/SMARCA3 complex represses Neurensin-2 transcription in hippocampal parvalbumin-expressing interneurons after chronic SSRI treatment; SMARCA3 accumulates in the cell nucleus upon SSRI treatment and regulates AMPA-receptor signaling in these interneurons.","method":"Cell-type-specific knockout, nuclear fractionation, gene expression analysis, behavioral assays, electrophysiology","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific KO with cellular and behavioral phenotypes plus nuclear localization, single lab","pmids":["33723417"],"is_preprint":false},{"year":2019,"finding":"A germline HLTF E259K mutation found in familial MDS reduces HLTF binding to ubiquitin-conjugating enzymes MMS2 and UBC13, resulting in impaired PCNA polyubiquitination and accumulation of DNA double-strand breaks.","method":"Co-immunoprecipitation of E259K mutant with E2 enzymes, PCNA ubiquitination assay, γH2AX immunofluorescence","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — patient-derived mutation tested with Co-IP and functional PCNA ubiquitination assay, single lab","pmids":["30696947"],"is_preprint":false},{"year":2020,"finding":"HLTF interacts with PARP1; depletion of HLTF and PARP1 together increases chromosome breaks and reduces replication track length after MMS treatment. HLTF and PARP1 are initially recruited to damaged forks together with BRCA1/BARD1/RAD51, but HLTF and PCNA dissociate from collapsed forks while PARP1 and BRCA1/BARD1/RAD51 accumulate further.","method":"Co-immunoprecipitation, proximity ligation assay, DNA fiber analysis, immunofluorescence","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus PLA plus fiber analysis, single lab","pmids":["33281189"],"is_preprint":false},{"year":2020,"finding":"Crystal structure of the HLTF HIRAN domain bound to duplex DNA reveals that HIRAN binds the 3'-hydroxyl group and unexpectedly unwinds three nucleobases; Phe-142 is required for dsDNA binding and strand separation, suggesting direct involvement of HIRAN in initiating fork regression by separating daughter strand from parental template.","method":"Crystal structure of HIRAN-duplex DNA complex, mutational analysis of Phe-142","journal":"Journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation, single lab but high-resolution structural data","pmids":["31960921"],"is_preprint":false},{"year":2022,"finding":"HLTF interacts with MSH2 (a component of MutS heterodimers); this interaction is conserved from yeast Rad5/Msh2 to human HLTF/MSH2. SHPRH (not HLTF) interacts with MLH1.","method":"Co-immunoprecipitation, bioinformatic identification of conserved interaction, yeast two-hybrid","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP in human and yeast systems, conservation confirmed, single lab","pmids":["35784486"],"is_preprint":false},{"year":2024,"finding":"HLTF directly removes Cas9 from broken DNA ends via its HIRAN domain and translocase activity, enabling DSB processing by MRE11-dependent resection or NHEJ. HLTF activity requires binding the 3'-end generated by cleavage of the non-target strand (RuvC domain); HLTF removes H840A but not D10A Cas9 nickase.","method":"In vitro Cas9 displacement assay (reconstitution), single-molecule assay, HIRAN domain mutant analysis, cellular DSB repair assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro system plus single-molecule assay plus HIRAN mutagenesis plus cellular validation, single lab but multiple orthogonal methods","pmids":["38987539"],"is_preprint":false},{"year":2024,"finding":"HLTF is enriched at G4 loci in the human genome, can directly unfold G4 structures in vitro using its ATP-dependent translocase activity, and suppresses G4 accumulation throughout the cell cycle. HLTF also restrains PrimPol-dependent repriming when G4s are stabilized, preventing unrestrained DNA synthesis.","method":"In vitro G4 unfolding assay, G4 immunofluorescence/CUT&RUN in HLTF-KO cells, PrimPol epistasis, DNA fiber assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro biochemical assay plus HLTF-KO cellular assays plus epistasis with PrimPol, single lab but multiple orthogonal methods","pmids":["39142279"],"is_preprint":false},{"year":2023,"finding":"β-TrCP mediates ubiquitination and proteasomal degradation of HLTF in hepatocellular carcinoma; HLTF knockdown enhances p62 transcriptional activity and mTOR activation, promoting HCC tumorigenesis.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression with mTOR signaling readouts, patient tissue correlation","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus ubiquitination assay plus signaling pathway readout, single lab","pmids":["36822623"],"is_preprint":false},{"year":2025,"finding":"When the DNA replication checkpoint is non-functional, excess DNA synthesis sequesters PCNA and RFC, leaving nascent DNA ends unprotected; HLTF attacks these unprotected ends, causing irreversible replication fork collapse and ssDNA hyperaccumulation. Loss of HLTF suppresses fork collapse and cell lethality in checkpoint-deficient cells.","method":"HLTF knockout in checkpoint-deficient human cells, DNA fiber assay, ssDNA accumulation assay, genetic epistasis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — HLTF KO in isogenic checkpoint-deficient background with multiple cellular phenotype readouts, replicated across preprint and peer-reviewed paper","pmids":["40578346"],"is_preprint":false},{"year":2025,"finding":"USP37 interacts with HLTF and limits HLTF accumulation at replication forks, thereby preventing MRE11-dependent fork degradation upon replication stress. Depletion of HLTF reverses replication-associated damage in USP37 knockout cells.","method":"Co-immunoprecipitation, DNA fiber assay, proximity ligation assay, genetic epistasis (USP37 KO + HLTF depletion)","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus fiber analysis plus genetic epistasis, single lab","pmids":["40548939"],"is_preprint":false},{"year":2025,"finding":"SMARCA3/HLTF acts as an E3 ubiquitin ligase that targets histone H3 at lysine 23 (H3K23Ub); this activity is stimulated by the H3K9me3 mark. Loss of SMARCA3 reduces both H3K23Ub and H3K9me3, increasing chromatin accessibility at promoters and enhancers, and suppression of tumor growth requires the intact RING domain.","method":"In vitro histone ubiquitination assay, mass spectrometry identification of H3K23Ub, RING domain mutant in xenograft model, ATAC-seq, CUT&Tag","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro enzymatic assay with MS identification of modification site plus RING mutant functional validation plus chromatin accessibility assays, single lab but multiple orthogonal methods","pmids":["40680746"],"is_preprint":false},{"year":2026,"finding":"HLTF directly binds the GATA1 promoter to enhance GATA1 transcription; HLTF physically interacts with GATA1 protein and co-occupies erythroid regulatory regions, facilitating GATA1 genomic binding and maintaining chromatin accessibility. GATA1 also transcriptionally activates HLTF, forming a positive feedback loop.","method":"ChIP-seq (CUT&Tag), ATAC-seq, RNA-seq, co-immunoprecipitation, HLTF KO rescue by GATA1 overexpression","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omics (CUT&Tag, ATAC-seq) plus Co-IP plus rescue genetics, single lab","pmids":["41521666"],"is_preprint":false},{"year":2026,"finding":"HLTF exists as an inactive monomer with low ATP accessibility but retains DNA fork binding activity; in the presence of a DNA fork, monomeric HLTF forms a hetero protein-DNA complex that enhances ATP accessibility via allosteric modulation. ATP induces HLTF dimerization, which is critical for DNA unwinding and fork regression.","method":"Native mass spectrometry of HLTF-DNA complexes, ATPase assay, DNA fork regression assay","journal":"Journal of the American Chemical Society","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — native MS plus biochemical assays, single lab, novel method but limited independent validation","pmids":["42030070"],"is_preprint":false},{"year":2021,"finding":"In fission yeast, Rad8/HLTF facilitates Rad52-dependent gross chromosomal rearrangements (GCRs) through ubiquitination of PCNA at lysine 107 (not the canonical K164); Rad8 HIRAN and RING finger mutations reduce GCRs, indicating both 3'-DNA end binding and ubiquitin ligase activity are required.","method":"Genetic epistasis in rad51Δ fission yeast, HIRAN and RING mutant analysis, PCNA K107R mutation, GCR frequency assay","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple mutants in fission yeast ortholog, single lab","pmids":["34292936"],"is_preprint":false},{"year":2024,"finding":"DTX2 E3 ubiquitin ligase interacts with HLTF and promotes its ubiquitination and degradation; HLTF acts as a tumor suppressor in glioma, inhibiting proliferation and migration.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, knockdown/overexpression in glioma cells and xenografts","journal":"Biology direct","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus in vitro ubiquitination plus functional cellular and in vivo assays, single lab","pmids":["38163902"],"is_preprint":false},{"year":2025,"finding":"LINC01088 lncRNA acts as a scaffold to bridge HLTF and USP7, enhancing HLTF-USP7 interaction and preventing ubiquitin-mediated degradation of HLTF. Stabilized HLTF transcriptionally upregulates SLC7A11, inhibiting ferroptosis in glioblastoma.","method":"RNA pulldown, co-immunoprecipitation, RNA immunoprecipitation, ChIP assay, rescue experiments with HLTF modulation","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple binding assays plus ChIP plus functional rescue, single lab","pmids":["40000422"],"is_preprint":false},{"year":2023,"finding":"HLTF interacts with SRSF1 and contributes to SRSF1 protein stability, activating the ERK/MAPK signaling pathway to promote HCC proliferation and metastasis.","method":"Co-immunoprecipitation, SRSF1 stability assay, ERK/MAPK pathway readout, knockdown/overexpression in HCC cells and xenografts","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus stability assay plus pathway readout, single lab","pmids":["36670110"],"is_preprint":false},{"year":2025,"finding":"HLTF is identified as a transcriptional regulator of CD137L, controlling its expression through phosphorylation of serine at position 398 of HLTF.","method":"Multi-omics data integration, phospho-mutant analysis, CD137L promoter regulation assays","journal":"Nature communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — abstract does not detail the mechanistic experiments fully; phosphorylation claim and transcriptional regulation asserted but method detail limited","pmids":["41006211"],"is_preprint":false},{"year":2024,"finding":"HLTF transcriptionally activates SERPINE1 (PAI-1) in cervical carcinoma cells; this was validated by ChIP demonstrating HLTF binding to the SERPINE1 promoter.","method":"Chromatin immunoprecipitation, transcriptome sequencing, knockdown/overexpression rescue experiments","journal":"Gynecologic and obstetric investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP plus functional rescue, single lab, limited mechanistic depth in abstract","pmids":["39348822"],"is_preprint":false},{"year":2003,"finding":"Progesterone regulates RUSH/SMARCA3 transcription via a progesterone receptor half-site/overlapping Y-box element in the promoter; Sp1 sites repress basal transcription. The RING finger domain of RUSH mediates protein-protein interactions with Egr-1 and c-Rel.","method":"Truncation/mutation analysis in transfection assays, gel shift assays, chromatin immunoprecipitation, primer extension","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — multiple promoter mutants plus ChIP plus gel shift, single lab, focused mechanistic study","pmids":["12890680"],"is_preprint":false},{"year":2008,"finding":"RUSH/SMARCA3 bound to a distal site (-616/-611) loops the intervening DNA to interact with Egr-1 and c-Rel at the proximal promoter in a progesterone-dependent manner; this DNA looping mediates repression by c-Rel and is dependent on the RING finger protein-interaction domain of RUSH.","method":"Chromosome Conformation Capture (3C) assay, fluorescence microscopy, GST pulldown, ChIP, supershift assays, transient transfection with mutant constructs","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3C assay plus GST pulldown plus ChIP plus functional reporter assays, single lab","pmids":["18174357"],"is_preprint":false}],"current_model":"HLTF is a multifunctional SWI/SNF-family protein that acts as a Rad5 ortholog in human DNA damage tolerance: its RING domain catalyzes K63-linked PCNA polyubiquitination (in complex with Mms2-Ubc13/UBC13-UBE2V2) to promote error-free template switching; its SWI/SNF ATPase/translocase domain drives ATP-dependent replication fork reversal and protein clearance at stalled forks; and its N-terminal HIRAN domain—an OB-fold that specifically recognizes 3'-OH single-stranded DNA ends—recruits the protein to stalled forks and directs the translocase for fork regression. HLTF additionally participates in nucleotide excision repair by evicting the incision complex after dual incision, removes Cas9 from broken ends to enable DSB processing, unfolds G-quadruplex structures, acts as a histone H3K23 E3 ubiquitin ligase, and functions as a transcription factor (including regulating GATA1 in erythropoiesis and prolactin in pituitary cells). Its stability is regulated by USP7 (stabilizing deubiquitinase), USP37, CHFR, β-TrCP, and DTX2 (degrading E3 ligases), and HIV-1 Vpr exploits the CRL4-DCAF1 E3 ligase to degrade HLTF and counteract its restriction of HIV-1 replication."},"narrative":{"mechanistic_narrative":"HLTF is a multifunctional SWI/SNF-family enzyme that acts as a human Rad5 ortholog at the center of DNA damage tolerance during replication, combining an N-terminal HIRAN domain, a SWI/SNF ATPase/translocase motor, and a RING E3 ubiquitin ligase domain into a single coordinated activity [PMID:18316726, PMID:18719106, PMID:26051180, PMID:25858588, PMID:19948885]. Its RING domain catalyzes Lys-63-linked polyubiquitination of PCNA at Lys-164 in concert with the Rad6-Rad18 and Mms2-Ubc13 ubiquitin-conjugating machinery to drive error-free postreplication repair [PMID:18316726, PMID:18719106]; this ligase reaction is recruited and modulated by HIRAN-dependent binding to stalled primer ends and is coupled to RAD6-RAD18-mediated PCNA monoubiquitination [PMID:30335157]. The HIRAN domain is an OB-fold that specifically recognizes 3'-OH single-stranded DNA ends, binds the 3'-hydroxyl and locally unwinds the duplex, thereby recruiting HLTF to stalled forks and providing directional guidance for the translocase during fork regression [PMID:26051180, PMID:25858588, PMID:31960921]. The ATPase/translocase motor independently reverses replication forks, clears DNA-binding proteins such as RPA, PCNA and RFC from stalled forks, and requires ATP-induced dimerization for productive unwinding [PMID:19948885, PMID:21795603, PMID:42030070]. HLTF determines fork remodeling choice in cells: its loss redirects stressed forks to PRIMPOL-dependent repriming, and its activity can become deleterious when checkpoint failure leaves nascent ends unprotected, causing fork collapse [PMID:32442397, PMID:40578346]. Beyond replication, HLTF evicts the NER incision complex after dual incision to enable repair synthesis, removes Cas9 from cleaved DNA ends to permit DSB processing, and unfolds genomic G-quadruplex structures [PMID:35271816, PMID:38987539, PMID:39142279]. It additionally functions as a histone H3K23 E3 ubiquitin ligase stimulated by H3K9me3, controlling chromatin accessibility [PMID:40680746], and as a transcription factor, regulating GATA1 in erythropoiesis and partnering with PIT-1 and the p11/annexin A2 complex in lactotrope and neuronal contexts [PMID:41521666, PMID:21507896, PMID:23415230]. A germline HLTF E259K mutation that disrupts E2 binding and PCNA polyubiquitination is associated with familial MDS [PMID:30696947]. HLTF abundance is tuned by the stabilizing deubiquitinase USP7 and by degradative E3 ligases including CHFR, β-TrCP and DTX2 [PMID:21845734, PMID:20388495, PMID:36822623, PMID:38163902], and HIV-1 Vpr hijacks the CRL4-DCAF1 ligase to degrade HLTF and counteract its restriction of HIV-1 [PMID:27114546, PMID:27335459, PMID:31019079].","teleology":[{"year":2008,"claim":"Established HLTF as the human Rad5 ortholog by showing it polyubiquitinates PCNA, defining its core role in error-free postreplication repair.","evidence":"In vitro ubiquitin ligase assays, Co-IP with Rad6-Rad18 and Mms2-Ubc13, and rad5Δ yeast complementation","pmids":["18316726","18719106"],"confidence":"High","gaps":["Did not define how HLTF is recruited to damaged forks","Did not address the function of the SWI/SNF ATPase domain"]},{"year":2009,"claim":"Showed HLTF carries intrinsic ATPase and ligase activities and physically associates with PTIP and RPA70, beginning to define its activity repertoire and partners.","evidence":"In vitro ATPase and ligase assays with multiple E2s plus pulldowns","pmids":["19723507"],"confidence":"Medium","gaps":["Functional consequence of PTIP/RPA70 interactions not established"]},{"year":2009,"claim":"Demonstrated that the SWI/SNF motor drives replication fork reversal and fork restart, separating a translocase function from the ligase activity.","evidence":"In vitro fork reversal assays with ATPase-deficient mutants and chromosomal fiber analysis","pmids":["19948885"],"confidence":"High","gaps":["Did not establish how the motor is targeted to forks","Physiological consequences of unregulated reversal unresolved"]},{"year":2011,"claim":"Defined a protein-clearance activity and a damage-specific division of labor with SHPRH, explaining how HLTF prepares stalled forks for bypass.","evidence":"In vitro protein displacement assays (RPA/PCNA/RFC) and siRNA/Co-IP analyses of TLS polymerase recruitment","pmids":["21795603","21396873"],"confidence":"High","gaps":["Mechanism switching HLTF vs SHPRH after MMS not fully resolved","Structural basis of protein displacement unknown"]},{"year":2011,"claim":"Identified USP7 as a stabilizing deubiquitinase, the first node showing HLTF abundance is post-translationally tuned to control PCNA ubiquitination.","evidence":"Co-IP, deubiquitination and half-life assays with PCNA ubiquitination readout","pmids":["21845734"],"confidence":"Medium","gaps":["Did not identify the counteracting degradative ligase","Single lab"]},{"year":2013,"claim":"Revealed HLTF can promote RAD51-independent D-loop formation, providing a template-switch route for gap repair independent of ATP hydrolysis.","evidence":"In vitro D-loop and primer extension assays with ATPase/ATP-binding mutants","pmids":["24198246"],"confidence":"High","gaps":["In vivo relevance of D-loop activity not established"]},{"year":2015,"claim":"Solved how HLTF finds its substrate: the HIRAN OB-fold binds 3' ssDNA ends to recruit HLTF to stalled forks and direct translocase-driven fork reversal.","evidence":"Crystal structure of HIRAN-DNA, 3'-ssDNA binding and HIRAN-mutant fork reversal assays in vitro and in cells","pmids":["26051180","25858588","26350214"],"confidence":"High","gaps":["Did not define how HIRAN coordinates with the motor at atomic level during translocation"]},{"year":2016,"claim":"Linked HLTF degradation to viral antagonism, showing HIV-1 Vpr exploits CRL4-DCAF1 to destroy HLTF independently of G2 arrest.","evidence":"Quantitative proteomics, proteasome-rescue Western blots, HIV-1 infection of primary T cells and macrophages","pmids":["27114546","27335459"],"confidence":"High","gaps":["Antiviral function of HLTF itself not yet demonstrated at this stage"]},{"year":2016,"claim":"Provided a solution structure of the free HIRAN domain, revealing conformational heterogeneity at the DNA-binding site.","evidence":"Solution NMR structure determination","pmids":["27771863"],"confidence":"Medium","gaps":["No functional mutagenesis in this work","Free-domain structure only"]},{"year":2017,"claim":"Detailed the molecular interface of Vpr-driven degradation, showing Vpr loads HLTF onto DCAF1 by engaging the HIRAN DNA-binding residues.","evidence":"In vitro reconstitution of Vpr-dependent HLTF polyubiquitination plus structure-guided mutagenesis","pmids":["29079575"],"confidence":"High","gaps":["Single lab","Did not confirm HLTF antiviral phenotype"]},{"year":2018,"claim":"Dissected the regulated mechanics of PCNA polyubiquitination, showing HIRAN-recruited HLTF couples to RAD6-RAD18 monoubiquitination and is steered between en bloc and sequential modes by RFC/PCNA.","evidence":"Reconstituted in vitro ligase assays with HIRAN mutants and RFC/PCNA competition","pmids":["30335157"],"confidence":"High","gaps":["Cellular relevance of the chain-elongation switch not directly tested"]},{"year":2019,"claim":"Confirmed HLTF restricts HIV-1 replication, establishing it as a genuine restriction factor antagonized by Vpr.","evidence":"Pairwise HIV-1 replication competition with Vpr separation-of-function mutants and HLTF knockdown","pmids":["31019079"],"confidence":"Medium","gaps":["Molecular mechanism of restriction not defined","Single lab"]},{"year":2019,"claim":"Connected HLTF to human disease by showing a familial-MDS germline E259K mutation disrupts E2 binding and PCNA polyubiquitination, causing DSB accumulation.","evidence":"Co-IP of E259K with MMS2/UBC13, PCNA ubiquitination and γH2AX assays","pmids":["30696947"],"confidence":"Medium","gaps":["Causality in MDS established only in cellular assays","Single family/lab"]},{"year":2020,"claim":"Established HLTF as the gatekeeper of fork remodeling choice, with its loss diverting forks to PRIMPOL repriming and altering DSB/survival outcomes.","evidence":"Electron microscopy of fork structures, PRIMPOL/REV1 epistasis, fiber assays and DSB quantification in HLTF KO/HIRAN mutants","pmids":["32442397"],"confidence":"High","gaps":["Long-term genomic consequences of fork-reversal loss not defined"]},{"year":2020,"claim":"Defined the structural basis of HIRAN-initiated fork regression, showing it binds the 3'-OH and unwinds three nucleobases via Phe-142.","evidence":"Crystal structure of HIRAN-duplex DNA with Phe-142 mutagenesis","pmids":["31960921"],"confidence":"High","gaps":["Coupling of HIRAN unwinding to the ATPase motor still inferred"]},{"year":2020,"claim":"Placed HLTF in the broader fork-protection network through interaction with PARP1 and co-recruitment with BRCA1/BARD1/RAD51, while defining its distinct dissociation behavior at collapsed forks.","evidence":"Co-IP, proximity ligation, DNA fiber analysis and immunofluorescence","pmids":["33281189"],"confidence":"Medium","gaps":["Direct vs indirect HLTF-PARP1 interaction not fully resolved","Single lab"]},{"year":2020,"claim":"Showed APIM-mediated PCNA binding contributes to HLTF's TLS role and shapes UV mutation spectra, defining an additional PCNA-engagement mode.","evidence":"APIM mutant analysis, nuclear localization, SupF mutagenesis and PCNA binding assays","pmids":["31973093"],"confidence":"Medium","gaps":["Relative contribution of APIM vs HIRAN to fork engagement unclear"]},{"year":2022,"claim":"Extended HLTF's translocase function into nucleotide excision repair, showing it evicts the incision complex to enable PCNA loading and repair synthesis.","evidence":"Reconstituted NER system, HIRAN mutant analysis, PCNA loading and cellular NER kinetics","pmids":["35271816"],"confidence":"High","gaps":["In vivo contribution to NER efficiency across lesion types not quantified"]},{"year":2022,"claim":"Identified a conserved HLTF-MSH2 interaction linking HLTF to mismatch-repair machinery, distinguishing it from SHPRH-MLH1.","evidence":"Co-IP in human and yeast, bioinformatic conservation analysis and yeast two-hybrid","pmids":["35784486"],"confidence":"Medium","gaps":["Functional role of HLTF-MSH2 in repair not established"]},{"year":2024,"claim":"Revealed a Cas9-eviction activity, showing HLTF removes Cas9 from cleaved ends via HIRAN/translocase to license DSB processing.","evidence":"Reconstituted Cas9 displacement assays, single-molecule assays, HIRAN mutants and cellular DSB repair readouts","pmids":["38987539"],"confidence":"High","gaps":["Whether endogenous DNA-protein crosslinks are general substrates not defined"]},{"year":2024,"claim":"Demonstrated HLTF unfolds genomic G-quadruplexes via its translocase and restrains PrimPol repriming at stabilized G4s.","evidence":"In vitro G4 unfolding, G4 immunofluorescence/CUT&RUN in HLTF-KO cells, PrimPol epistasis and fiber assays","pmids":["39142279"],"confidence":"High","gaps":["Genome-wide impact on G4-associated instability not fully mapped"]},{"year":2024,"claim":"Added DTX2 as a degradative ligase and supported a tumor-suppressor role for HLTF in glioma.","evidence":"Co-IP, in vitro ubiquitination and knockdown/overexpression in glioma cells and xenografts","pmids":["38163902"],"confidence":"Medium","gaps":["Degradation signal/site on HLTF not mapped","Single lab"]},{"year":2023,"claim":"Identified β-TrCP as a degradative ligase coupling HLTF loss to p62/mTOR-driven HCC tumorigenesis.","evidence":"Co-IP, ubiquitination assays, signaling readouts and patient tissue correlation","pmids":["36822623"],"confidence":"Medium","gaps":["Degron recognized by β-TrCP not defined"]},{"year":2025,"claim":"Defined a self-limiting axis where USP37 restrains HLTF accumulation at forks to prevent MRE11-dependent fork degradation.","evidence":"Co-IP, fiber assays, proximity ligation and USP37 KO + HLTF depletion epistasis","pmids":["40548939"],"confidence":"Medium","gaps":["Whether USP37 acts catalytically or by sequestration unclear"]},{"year":2025,"claim":"Showed that excess HLTF activity is pathological in checkpoint-deficient cells, where it attacks unprotected nascent ends and drives irreversible fork collapse.","evidence":"HLTF KO in checkpoint-deficient cells, fiber assays, ssDNA accumulation and genetic epistasis","pmids":["40578346"],"confidence":"High","gaps":["Mechanistic trigger distinguishing protective vs destructive HLTF action not fully defined"]},{"year":2025,"claim":"Established a chromatin-modifying function, identifying HLTF as an H3K23 E3 ligase stimulated by H3K9me3 that limits chromatin accessibility and tumor growth via its RING domain.","evidence":"In vitro histone ubiquitination with MS site identification, RING-mutant xenografts, ATAC-seq and CUT&Tag","pmids":["40680746"],"confidence":"High","gaps":["Reader/effector of H3K23Ub not identified"]},{"year":2026,"claim":"Defined a transcriptional role in erythropoiesis, with HLTF and GATA1 forming a positive feedback loop that maintains erythroid chromatin accessibility.","evidence":"CUT&Tag, ATAC-seq, RNA-seq, Co-IP and GATA1-rescue of HLTF KO","pmids":["41521666"],"confidence":"Medium","gaps":["Whether HLTF acts here as remodeler, ligase, or sequence-specific factor not resolved"]},{"year":2026,"claim":"Provided a mechanistic model for motor activation, showing fork binding and ATP induce HLTF dimerization required for unwinding and fork regression.","evidence":"Native mass spectrometry of HLTF-DNA complexes plus ATPase and fork regression assays","pmids":["42030070"],"confidence":"Medium","gaps":["Dimer architecture and stoichiometry at forks not resolved structurally","Single lab/novel method"]},{"year":null,"claim":"How HLTF's distinct activities—fork reversal, NER eviction, Cas9 removal, G4 unfolding, PCNA and H3K23 ubiquitination, and transcription—are selectively deployed and regulated in a context-specific manner remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking enzymatic activity choice to substrate context","Switch between protective and destructive fork action undefined","Structural basis for transcription-factor vs translocase modes unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,2,26,32]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,16,30]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,30]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,23,19]},{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[1,4,26,25]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[30]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[18,31,39,40]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,19,20,31]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[13,28,26]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,14,25]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[1,2,13,28]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[30,31]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[18,31,39,40]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[21,7,9,27,34]}],"complexes":["CRL4-DCAF1 (substrate of, via Vpr)","p11/annexin A2 heterotetramer"],"partners":["PCNA","RAD18","UBC13","MMS2","USP7","MSH2","PARP1","GATA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14527","full_name":"DNA-dependent ATPase/E3 ubiquitin-protein ligase HLTF","aliases":["DNA-binding protein/plasminogen activator inhibitor 1 regulator","HIP116","Helicase-like transcription factor","HLTF","RING finger protein 80","RING-type E3 ubiquitin transferase HLTF","SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 3","SMARCA3","Sucrose nonfermenting protein 2-like 3"],"length_aa":1009,"mass_kda":113.9,"function":"Functions as a DNA-dependent ATPase and E3 ubiquitin-protein ligase involved in chromatin regulation and DNA damage tolerance (DDT) (PubMed:18316726, PubMed:18719106, PubMed:26051180, PubMed:31960921, PubMed:39142279, PubMed:40680746). Catalyzes 'Lys-63'-linked polyubiquitination of monoubiquitinated PCNA at 'Lys-164' in response to genotoxic stress, promoting error-free postreplication repair via template switching (PubMed:18316726, PubMed:18719106). Acts as an epigenetic regulator by promoting recruitment of DNMT1, thereby ensuring DNA methylation inheritance: specifically binds histone H3 trimethylated at 'Lys-9' (H3K9me3) and mediates histone H3 'Lys-23' polyubiquitination (H3K23ub), a docking site for DNMT1, leading to DNMT1 recruitment and replication-coupled DNA methylation maintenance (PubMed:40680746). Catalyzes formation of H3K23ub in two steps: first mediates monoubiquitination together with UBE2E1 and UBE2D2, and then extends ubiquitin chains via 'Lys-63'-linked ubiquitination together with UBE2N and UBE2V2 (PubMed:40680746). Also acts as a chromatin redodeling factor, thereby regulating transcription (PubMed:10391891, PubMed:1994885, PubMed:9126292). Exhibits ATP-dependent double-stranded DNA (dsDNA) translocase activity but lacks classical helicase activity; mediates replication fork reversal by concertedly unwinding and annealing nascent and parental strands, thereby suppressing DNA synthesis and maintaining genomic stability (PubMed:1994885). Resolves G-quadruplex (G4) DNA structures in cooperation with MSH2, limiting replication stress and G4 accumulation across the cell cycle (PubMed:39142279). Contributes to nucleotide excision repair by evicting lesion-containing oligonucleotides using its HIRAN and ATPase domains (PubMed:26051180). Can displace single-stranded DNA from triplex structures through ATP-dependent dsDNA translocation (PubMed:26051180, PubMed:31960921). Also has protein clearing activity at the stalled replication fork, facilitating restart of DNA replication (PubMed:21795603)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q14527/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HLTF","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"PARP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HLTF","total_profiled":1310},"omim":[{"mim_id":"611442","title":"DOUBLE HOMEOBOX PROTEIN 2; DUX2","url":"https://www.omim.org/entry/611442"},{"mim_id":"611441","title":"DOUBLE HOMEOBOX PROTEIN 1; DUX1","url":"https://www.omim.org/entry/611441"},{"mim_id":"605837","title":"HECT DOMAIN AND RCC1-LIKE DOMAIN 2; HERC2","url":"https://www.omim.org/entry/605837"},{"mim_id":"603257","title":"SWI/SNF-RELATED, MATRIX-ASSOCIATED, ACTIN-DEPENDENT REGULATOR OF CHROMATIN, SUBFAMILY A, MEMBER 3; SMARCA3","url":"https://www.omim.org/entry/603257"},{"mim_id":"151740","title":"ANNEXIN A2; ANXA2","url":"https://www.omim.org/entry/151740"}],"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/HLTF"},"hgnc":{"alias_symbol":["HIP116A","HLTF1","RNF80"],"prev_symbol":["SNF2L3","SMARCA3"]},"alphafold":{"accession":"Q14527","domains":[{"cath_id":"3.30.70.2330","chopping":"58-168","consensus_level":"high","plddt":87.6229,"start":58,"end":168},{"cath_id":"3.40.50.10810","chopping":"201-316_475-657","consensus_level":"medium","plddt":82.1288,"start":201,"end":657},{"cath_id":"3.30.40.10","chopping":"672-727_739-812","consensus_level":"medium","plddt":76.2777,"start":672,"end":812},{"cath_id":"3.40.50.300","chopping":"834-1008","consensus_level":"high","plddt":82.7937,"start":834,"end":1008}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14527","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14527-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14527-F1-predicted_aligned_error_v6.png","plddt_mean":68.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HLTF","jax_strain_url":"https://www.jax.org/strain/search?query=HLTF"},"sequence":{"accession":"Q14527","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14527.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14527/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14527"}},"corpus_meta":[{"pmid":"18719106","id":"PMC_18719106","title":"Polyubiquitination 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co-immunoprecipitation, complementation of rad5Δ yeast strain, UV sensitivity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay plus Co-IP plus genetic complementation, replicated independently in two PNAS papers same year (PMIDs 18316726 and 18719106)\",\n      \"pmids\": [\"18316726\", \"18719106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HLTF possesses ATP-dependent double-stranded DNA translocase activity that enables replication fork reversal (regression of model replication forks), and promotes restart of replication forks blocked at DNA lesions in vivo.\",\n      \"method\": \"In vitro fork reversal assay with ATPase-deficient mutants, chromosomal fiber analysis of dually labeled replication tracks\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro biochemical reconstitution plus mutagenesis plus in vivo fiber analysis; replicated in subsequent studies\",\n      \"pmids\": [\"19948885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HLTF has an ATP hydrolysis-dependent protein remodeling activity that removes DNA-binding proteins (RPA, PCNA, RFC) from stalled replication forks, thereby clearing access for damage bypass factors.\",\n      \"method\": \"In vitro protein displacement assay with purified components, ATPase-deficient mutant analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro with purified proteins and ATPase mutant controls, single lab but multiple substrates tested orthogonally\",\n      \"pmids\": [\"21795603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Following UV damage, HLTF enhances PCNA monoubiquitination and recruitment of TLS polymerase η while inhibiting SHPRH; following MMS damage, HLTF is degraded, allowing SHPRH to interact with Rad18 and polymerase κ. Thus HLTF and SHPRH act in a damage-specific manner to coordinate different branches of postreplication repair.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, mutagenesis assays, immunofluorescence of TLS polymerase recruitment\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, genetic knockdown with defined pathway phenotypes, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"21396873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HLTF can form a D-loop (strand invasion) in a RAD51-independent manner without requiring ATP binding/hydrolysis; the 3' end of the invading strand in the D-loop can serve as a primer for DNA polymerase extension, providing a template-switch mechanism for gap repair.\",\n      \"method\": \"In vitro D-loop formation assay with purified proteins, ATPase-deficient mutants, primer extension assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical reconstitution with purified components and ATPase/ATP-binding mutants, single lab but multiple orthogonal assays\",\n      \"pmids\": [\"24198246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The HIRAN domain of HLTF is an OB-fold structure that specifically binds 3' ssDNA ends; this interaction recruits HLTF to stalled replication forks and drives fork reversal activity. HIRAN domain mutations abolish fork reversal in vitro and replication fork slowing in cells.\",\n      \"method\": \"Crystal structure of HIRAN-DNA complex, biochemical 3'-ssDNA binding assays, HIRAN mutant fork reversal assays in vitro, replication fork progression assays in cells\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus biochemical reconstitution plus mutagenesis plus cellular phenotype, independently confirmed by two papers same year (PMIDs 26051180 and 25858588)\",\n      \"pmids\": [\"26051180\", \"25858588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HIRAN domain mutant HLTF retains ubiquitin ligase, ATPase, and dsDNA translocase activities but is specifically impaired in binding model replication fork structures, demonstrating that the HIRAN domain recruits HLTF to stalled forks and provides directional guidance for the translocase motor during fork reversal.\",\n      \"method\": \"HIRAN domain mutagenesis, in vitro fork binding and reversal assays, ATPase assays, ubiquitin ligase assays, cellular postreplication repair gap-filling assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical assays with domain mutants plus cellular functional readout, single lab\",\n      \"pmids\": [\"26350214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HIV-1 Vpr subverts the DCAF1 adaptor of the CRL4A E3 ubiquitin ligase to trigger proteasomal degradation of HLTF in T cells and macrophages; this degradation occurs independently of Vpr-mediated G2 arrest.\",\n      \"method\": \"Quantitative proteomic screen, Western blot degradation assay, proteasome inhibitor rescue, HIV-1 infection experiments in primary T cells and macrophages\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — unbiased proteomics plus mechanistic validation plus primary cell infection, replicated by independent lab (PMID 27335459)\",\n      \"pmids\": [\"27114546\", \"27335459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HIV-1 Vpr directly loads HLTF onto the WD40 domain of DCAF1 within the CRL4 E3 ubiquitin ligase, mediating HLTF polyubiquitination. Vpr interacts with DNA-binding residues in HLTF's HIRAN domain and a second region connecting HIRAN to the ATPase/helicase domains.\",\n      \"method\": \"In vitro reconstitution of Vpr-dependent HLTF polyubiquitination, mutational analysis of HIRAN domain interaction interface\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro ubiquitination with purified components plus structure-guided mutagenesis, single lab\",\n      \"pmids\": [\"29079575\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HLTF restricts HIV-1 replication in activated primary CD4+ T cells; this restriction is antagonized by HIV-1 Vpr via CRL4-DCAF1-dependent degradation of HLTF.\",\n      \"method\": \"Pairwise HIV-1 replication competition assay, HLTF knockdown, Vpr separation-of-function mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic competition assay with Vpr mutants and HLTF knockdown, single lab, two orthogonal approaches\",\n      \"pmids\": [\"31019079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"USP7 (ubiquitin-specific protease 7) interacts with HLTF and stabilizes it after genotoxic stress by deubiquitination, prolonging HLTF half-life and thereby increasing PCNA polyubiquitination.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, half-life/stability assay, siRNA knockdown with PCNA ubiquitination readout\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus deubiquitination assay plus functional PCNA ubiquitination readout, single lab\",\n      \"pmids\": [\"21845734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CHFR E3 ubiquitin ligase binds to and ubiquitinates HLTF, leading to its proteasomal degradation; HLTF modulates basal expression of PAI-1, and CHFR-mediated HLTF degradation reduces PAI-1 expression and inhibits cell migration.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, cell migration assay, PAI-1 expression analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus in vitro ubiquitination plus functional migration assay, single lab\",\n      \"pmids\": [\"20388495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HLTF has intrinsic ATPase activity and E3 ubiquitin ligase activity with a range of E2 ubiquitin-conjugating enzymes in vitro. PTIP and RPA70 were identified as HLTF-interacting proteins.\",\n      \"method\": \"In vitro ATPase assay, in vitro ubiquitin ligase assay, co-immunoprecipitation/pulldown\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro enzymatic assays plus pulldown, single lab, limited follow-up\",\n      \"pmids\": [\"19723507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In HLTF-deficient cells, replication forks fail to undergo reversal following replication stress and instead rely on PRIMPOL for repriming and unrestrained replication. In HLTF-HIRAN mutant cells, unrestrained replication depends on REV1 (TLS). HLTF-deficient cells show reduced DSB formation and increased survival under replication stress.\",\n      \"method\": \"HLTF knockout/HIRAN mutant cells, electron microscopy of fork structures, PRIMPOL and REV1 epistasis analysis, DNA fiber assay, DSB quantification\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — EM visualization of fork structures plus genetic epistasis with multiple mutants plus fiber analysis, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"32442397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HLTF is recruited to the NER incision complex in a dual-incision-dependent manner via its HIRAN domain binding to 3'-OH single-stranded DNA ends; HLTF's translocase motor then promotes dissociation of the incision complex together with the incised oligonucleotide, enabling efficient PCNA loading and repair synthesis.\",\n      \"method\": \"In vitro NER reconstitution, HLTF recruitment assay, HIRAN domain mutant analysis, PCNA loading assay, cellular NER kinetics\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reconstituted NER system plus HIRAN mutant analysis plus cellular repair assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35271816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Solution NMR structure of the human HLTF HIRAN domain reveals an OB-like fold; the free domain exhibits conformational heterogeneity at its DNA-binding site. Sequence comparison suggests SHPRH N-terminus contains an uncharacterized structured module with weak HIRAN similarity.\",\n      \"method\": \"Solution NMR structure determination\",\n      \"journal\": \"Journal of biomolecular NMR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structure of free domain only, no functional mutagenesis validation in this paper\",\n      \"pmids\": [\"27771863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HLTF ligase activity is stimulated by double-stranded DNA via HIRAN domain-dependent recruitment to stalled primer ends; RFC and PCNA at primer ends suppress en bloc PCNA polyubiquitination, redirecting to sequential chain elongation. When PCNA is monoubiquitinated by RAD6-RAD18 in the presence of HLTF, the ubiquitin is immediately polyubiquitinated by HLTF (coupled reaction).\",\n      \"method\": \"In vitro ubiquitin ligase assay with reconstituted components, HIRAN mutant analysis, RFC/PCNA competition assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro assay with purified components and domain mutants testing multiple mechanistic steps, single lab\",\n      \"pmids\": [\"30335157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HLTF and SHPRH contain functional APIM (AlkB homologue 2 PCNA-interacting motif) sequences that mediate direct binding to PCNA; HLTF's role in TLS in overexpressing cells and nuclear localization of SHPRH depend on APIM-PCNA interaction. APIM mutation in HLTF alters mutation spectra, decreasing C-to-T transitions after UV.\",\n      \"method\": \"APIM mutant analysis, nuclear localization assay, mutagenesis (SupF) assay, PCNA binding assay\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional mutant analysis with cellular readouts, single lab, multiple assays\",\n      \"pmids\": [\"31973093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In pituitary lactotrope cells, HLTF (SMARCA3) binds the prolactin promoter E-box and interacts with the pituitary-specific factor PIT-1; NONO and SFPQ are HLTF-associated proteins identified by mass spectrometry that bind rhythmically to the prolactin promoter and regulate circadian prolactin transcription. NONO/SFPQ overexpression reduces Prl promoter activity and disrupts circadian pattern.\",\n      \"method\": \"Chromatin immunoprecipitation, mass spectrometry identification of HLTF-associated proteins, co-immunoprecipitation, promoter reporter assays, overexpression studies\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — ChIP plus MS identification plus functional reporter assays, single lab\",\n      \"pmids\": [\"21507896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SMARCA3/HLTF is a target of the p11/annexin A2 heterotetrameric complex; crystal structure shows SMARCA3 peptide binds a hydrophobic pocket in the heterotetramer; complex formation increases SMARCA3 DNA-binding affinity and its localization to the nuclear matrix fraction. SSRI-induced neurogenesis and behavioral responses are abolished by constitutive SMARCA3 knockout.\",\n      \"method\": \"Crystal structure of SMARCA3 peptide-heterotetramer complex, DNA-binding affinity assay, nuclear fractionation, SMARCA3 knockout behavioral/neurogenesis assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — crystal structure plus biochemical binding assay plus nuclear fractionation plus KO phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"23415230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The p11/SMARCA3 complex represses Neurensin-2 transcription in hippocampal parvalbumin-expressing interneurons after chronic SSRI treatment; SMARCA3 accumulates in the cell nucleus upon SSRI treatment and regulates AMPA-receptor signaling in these interneurons.\",\n      \"method\": \"Cell-type-specific knockout, nuclear fractionation, gene expression analysis, behavioral assays, electrophysiology\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific KO with cellular and behavioral phenotypes plus nuclear localization, single lab\",\n      \"pmids\": [\"33723417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A germline HLTF E259K mutation found in familial MDS reduces HLTF binding to ubiquitin-conjugating enzymes MMS2 and UBC13, resulting in impaired PCNA polyubiquitination and accumulation of DNA double-strand breaks.\",\n      \"method\": \"Co-immunoprecipitation of E259K mutant with E2 enzymes, PCNA ubiquitination assay, γH2AX immunofluorescence\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — patient-derived mutation tested with Co-IP and functional PCNA ubiquitination assay, single lab\",\n      \"pmids\": [\"30696947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HLTF interacts with PARP1; depletion of HLTF and PARP1 together increases chromosome breaks and reduces replication track length after MMS treatment. HLTF and PARP1 are initially recruited to damaged forks together with BRCA1/BARD1/RAD51, but HLTF and PCNA dissociate from collapsed forks while PARP1 and BRCA1/BARD1/RAD51 accumulate further.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, DNA fiber analysis, immunofluorescence\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus PLA plus fiber analysis, single lab\",\n      \"pmids\": [\"33281189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal structure of the HLTF HIRAN domain bound to duplex DNA reveals that HIRAN binds the 3'-hydroxyl group and unexpectedly unwinds three nucleobases; Phe-142 is required for dsDNA binding and strand separation, suggesting direct involvement of HIRAN in initiating fork regression by separating daughter strand from parental template.\",\n      \"method\": \"Crystal structure of HIRAN-duplex DNA complex, mutational analysis of Phe-142\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation, single lab but high-resolution structural data\",\n      \"pmids\": [\"31960921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HLTF interacts with MSH2 (a component of MutS heterodimers); this interaction is conserved from yeast Rad5/Msh2 to human HLTF/MSH2. SHPRH (not HLTF) interacts with MLH1.\",\n      \"method\": \"Co-immunoprecipitation, bioinformatic identification of conserved interaction, yeast two-hybrid\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP in human and yeast systems, conservation confirmed, single lab\",\n      \"pmids\": [\"35784486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HLTF directly removes Cas9 from broken DNA ends via its HIRAN domain and translocase activity, enabling DSB processing by MRE11-dependent resection or NHEJ. HLTF activity requires binding the 3'-end generated by cleavage of the non-target strand (RuvC domain); HLTF removes H840A but not D10A Cas9 nickase.\",\n      \"method\": \"In vitro Cas9 displacement assay (reconstitution), single-molecule assay, HIRAN domain mutant analysis, cellular DSB repair assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro system plus single-molecule assay plus HIRAN mutagenesis plus cellular validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38987539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HLTF is enriched at G4 loci in the human genome, can directly unfold G4 structures in vitro using its ATP-dependent translocase activity, and suppresses G4 accumulation throughout the cell cycle. HLTF also restrains PrimPol-dependent repriming when G4s are stabilized, preventing unrestrained DNA synthesis.\",\n      \"method\": \"In vitro G4 unfolding assay, G4 immunofluorescence/CUT&RUN in HLTF-KO cells, PrimPol epistasis, DNA fiber assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro biochemical assay plus HLTF-KO cellular assays plus epistasis with PrimPol, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39142279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"β-TrCP mediates ubiquitination and proteasomal degradation of HLTF in hepatocellular carcinoma; HLTF knockdown enhances p62 transcriptional activity and mTOR activation, promoting HCC tumorigenesis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown/overexpression with mTOR signaling readouts, patient tissue correlation\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus ubiquitination assay plus signaling pathway readout, single lab\",\n      \"pmids\": [\"36822623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"When the DNA replication checkpoint is non-functional, excess DNA synthesis sequesters PCNA and RFC, leaving nascent DNA ends unprotected; HLTF attacks these unprotected ends, causing irreversible replication fork collapse and ssDNA hyperaccumulation. Loss of HLTF suppresses fork collapse and cell lethality in checkpoint-deficient cells.\",\n      \"method\": \"HLTF knockout in checkpoint-deficient human cells, DNA fiber assay, ssDNA accumulation assay, genetic epistasis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — HLTF KO in isogenic checkpoint-deficient background with multiple cellular phenotype readouts, replicated across preprint and peer-reviewed paper\",\n      \"pmids\": [\"40578346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"USP37 interacts with HLTF and limits HLTF accumulation at replication forks, thereby preventing MRE11-dependent fork degradation upon replication stress. Depletion of HLTF reverses replication-associated damage in USP37 knockout cells.\",\n      \"method\": \"Co-immunoprecipitation, DNA fiber assay, proximity ligation assay, genetic epistasis (USP37 KO + HLTF depletion)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus fiber analysis plus genetic epistasis, single lab\",\n      \"pmids\": [\"40548939\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SMARCA3/HLTF acts as an E3 ubiquitin ligase that targets histone H3 at lysine 23 (H3K23Ub); this activity is stimulated by the H3K9me3 mark. Loss of SMARCA3 reduces both H3K23Ub and H3K9me3, increasing chromatin accessibility at promoters and enhancers, and suppression of tumor growth requires the intact RING domain.\",\n      \"method\": \"In vitro histone ubiquitination assay, mass spectrometry identification of H3K23Ub, RING domain mutant in xenograft model, ATAC-seq, CUT&Tag\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro enzymatic assay with MS identification of modification site plus RING mutant functional validation plus chromatin accessibility assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40680746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HLTF directly binds the GATA1 promoter to enhance GATA1 transcription; HLTF physically interacts with GATA1 protein and co-occupies erythroid regulatory regions, facilitating GATA1 genomic binding and maintaining chromatin accessibility. GATA1 also transcriptionally activates HLTF, forming a positive feedback loop.\",\n      \"method\": \"ChIP-seq (CUT&Tag), ATAC-seq, RNA-seq, co-immunoprecipitation, HLTF KO rescue by GATA1 overexpression\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omics (CUT&Tag, ATAC-seq) plus Co-IP plus rescue genetics, single lab\",\n      \"pmids\": [\"41521666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HLTF exists as an inactive monomer with low ATP accessibility but retains DNA fork binding activity; in the presence of a DNA fork, monomeric HLTF forms a hetero protein-DNA complex that enhances ATP accessibility via allosteric modulation. ATP induces HLTF dimerization, which is critical for DNA unwinding and fork regression.\",\n      \"method\": \"Native mass spectrometry of HLTF-DNA complexes, ATPase assay, DNA fork regression assay\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — native MS plus biochemical assays, single lab, novel method but limited independent validation\",\n      \"pmids\": [\"42030070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In fission yeast, Rad8/HLTF facilitates Rad52-dependent gross chromosomal rearrangements (GCRs) through ubiquitination of PCNA at lysine 107 (not the canonical K164); Rad8 HIRAN and RING finger mutations reduce GCRs, indicating both 3'-DNA end binding and ubiquitin ligase activity are required.\",\n      \"method\": \"Genetic epistasis in rad51Δ fission yeast, HIRAN and RING mutant analysis, PCNA K107R mutation, GCR frequency assay\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple mutants in fission yeast ortholog, single lab\",\n      \"pmids\": [\"34292936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DTX2 E3 ubiquitin ligase interacts with HLTF and promotes its ubiquitination and degradation; HLTF acts as a tumor suppressor in glioma, inhibiting proliferation and migration.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, knockdown/overexpression in glioma cells and xenografts\",\n      \"journal\": \"Biology direct\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus in vitro ubiquitination plus functional cellular and in vivo assays, single lab\",\n      \"pmids\": [\"38163902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LINC01088 lncRNA acts as a scaffold to bridge HLTF and USP7, enhancing HLTF-USP7 interaction and preventing ubiquitin-mediated degradation of HLTF. Stabilized HLTF transcriptionally upregulates SLC7A11, inhibiting ferroptosis in glioblastoma.\",\n      \"method\": \"RNA pulldown, co-immunoprecipitation, RNA immunoprecipitation, ChIP assay, rescue experiments with HLTF modulation\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple binding assays plus ChIP plus functional rescue, single lab\",\n      \"pmids\": [\"40000422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HLTF interacts with SRSF1 and contributes to SRSF1 protein stability, activating the ERK/MAPK signaling pathway to promote HCC proliferation and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, SRSF1 stability assay, ERK/MAPK pathway readout, knockdown/overexpression in HCC cells and xenografts\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus stability assay plus pathway readout, single lab\",\n      \"pmids\": [\"36670110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HLTF is identified as a transcriptional regulator of CD137L, controlling its expression through phosphorylation of serine at position 398 of HLTF.\",\n      \"method\": \"Multi-omics data integration, phospho-mutant analysis, CD137L promoter regulation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — abstract does not detail the mechanistic experiments fully; phosphorylation claim and transcriptional regulation asserted but method detail limited\",\n      \"pmids\": [\"41006211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HLTF transcriptionally activates SERPINE1 (PAI-1) in cervical carcinoma cells; this was validated by ChIP demonstrating HLTF binding to the SERPINE1 promoter.\",\n      \"method\": \"Chromatin immunoprecipitation, transcriptome sequencing, knockdown/overexpression rescue experiments\",\n      \"journal\": \"Gynecologic and obstetric investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP plus functional rescue, single lab, limited mechanistic depth in abstract\",\n      \"pmids\": [\"39348822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Progesterone regulates RUSH/SMARCA3 transcription via a progesterone receptor half-site/overlapping Y-box element in the promoter; Sp1 sites repress basal transcription. The RING finger domain of RUSH mediates protein-protein interactions with Egr-1 and c-Rel.\",\n      \"method\": \"Truncation/mutation analysis in transfection assays, gel shift assays, chromatin immunoprecipitation, primer extension\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — multiple promoter mutants plus ChIP plus gel shift, single lab, focused mechanistic study\",\n      \"pmids\": [\"12890680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RUSH/SMARCA3 bound to a distal site (-616/-611) loops the intervening DNA to interact with Egr-1 and c-Rel at the proximal promoter in a progesterone-dependent manner; this DNA looping mediates repression by c-Rel and is dependent on the RING finger protein-interaction domain of RUSH.\",\n      \"method\": \"Chromosome Conformation Capture (3C) assay, fluorescence microscopy, GST pulldown, ChIP, supershift assays, transient transfection with mutant constructs\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3C assay plus GST pulldown plus ChIP plus functional reporter assays, single lab\",\n      \"pmids\": [\"18174357\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HLTF is a multifunctional SWI/SNF-family protein that acts as a Rad5 ortholog in human DNA damage tolerance: its RING domain catalyzes K63-linked PCNA polyubiquitination (in complex with Mms2-Ubc13/UBC13-UBE2V2) to promote error-free template switching; its SWI/SNF ATPase/translocase domain drives ATP-dependent replication fork reversal and protein clearance at stalled forks; and its N-terminal HIRAN domain—an OB-fold that specifically recognizes 3'-OH single-stranded DNA ends—recruits the protein to stalled forks and directs the translocase for fork regression. HLTF additionally participates in nucleotide excision repair by evicting the incision complex after dual incision, removes Cas9 from broken ends to enable DSB processing, unfolds G-quadruplex structures, acts as a histone H3K23 E3 ubiquitin ligase, and functions as a transcription factor (including regulating GATA1 in erythropoiesis and prolactin in pituitary cells). Its stability is regulated by USP7 (stabilizing deubiquitinase), USP37, CHFR, β-TrCP, and DTX2 (degrading E3 ligases), and HIV-1 Vpr exploits the CRL4-DCAF1 E3 ligase to degrade HLTF and counteract its restriction of HIV-1 replication.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HLTF is a multifunctional SWI/SNF-family enzyme that acts as a human Rad5 ortholog at the center of DNA damage tolerance during replication, combining an N-terminal HIRAN domain, a SWI/SNF ATPase/translocase motor, and a RING E3 ubiquitin ligase domain into a single coordinated activity [#0, #5, #1]. Its RING domain catalyzes Lys-63-linked polyubiquitination of PCNA at Lys-164 in concert with the Rad6-Rad18 and Mms2-Ubc13 ubiquitin-conjugating machinery to drive error-free postreplication repair [#0]; this ligase reaction is recruited and modulated by HIRAN-dependent binding to stalled primer ends and is coupled to RAD6-RAD18-mediated PCNA monoubiquitination [#16]. The HIRAN domain is an OB-fold that specifically recognizes 3'-OH single-stranded DNA ends, binds the 3'-hydroxyl and locally unwinds the duplex, thereby recruiting HLTF to stalled forks and providing directional guidance for the translocase during fork regression [#5, #23]. The ATPase/translocase motor independently reverses replication forks, clears DNA-binding proteins such as RPA, PCNA and RFC from stalled forks, and requires ATP-induced dimerization for productive unwinding [#1, #2, #32]. HLTF determines fork remodeling choice in cells: its loss redirects stressed forks to PRIMPOL-dependent repriming, and its activity can become deleterious when checkpoint failure leaves nascent ends unprotected, causing fork collapse [#13, #28]. Beyond replication, HLTF evicts the NER incision complex after dual incision to enable repair synthesis, removes Cas9 from cleaved DNA ends to permit DSB processing, and unfolds genomic G-quadruplex structures [#14, #25, #26]. It additionally functions as a histone H3K23 E3 ubiquitin ligase stimulated by H3K9me3, controlling chromatin accessibility [#30], and as a transcription factor, regulating GATA1 in erythropoiesis and partnering with PIT-1 and the p11/annexin A2 complex in lactotrope and neuronal contexts [#31, #18, #19]. A germline HLTF E259K mutation that disrupts E2 binding and PCNA polyubiquitination is associated with familial MDS [#21]. HLTF abundance is tuned by the stabilizing deubiquitinase USP7 and by degradative E3 ligases including CHFR, \\u03b2-TrCP and DTX2 [#10, #11, #27, #34], and HIV-1 Vpr hijacks the CRL4-DCAF1 ligase to degrade HLTF and counteract its restriction of HIV-1 [#7, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established HLTF as the human Rad5 ortholog by showing it polyubiquitinates PCNA, defining its core role in error-free postreplication repair.\",\n      \"evidence\": \"In vitro ubiquitin ligase assays, Co-IP with Rad6-Rad18 and Mms2-Ubc13, and rad5\\u0394 yeast complementation\",\n      \"pmids\": [\"18316726\", \"18719106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how HLTF is recruited to damaged forks\", \"Did not address the function of the SWI/SNF ATPase domain\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed HLTF carries intrinsic ATPase and ligase activities and physically associates with PTIP and RPA70, beginning to define its activity repertoire and partners.\",\n      \"evidence\": \"In vitro ATPase and ligase assays with multiple E2s plus pulldowns\",\n      \"pmids\": [\"19723507\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of PTIP/RPA70 interactions not established\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that the SWI/SNF motor drives replication fork reversal and fork restart, separating a translocase function from the ligase activity.\",\n      \"evidence\": \"In vitro fork reversal assays with ATPase-deficient mutants and chromosomal fiber analysis\",\n      \"pmids\": [\"19948885\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how the motor is targeted to forks\", \"Physiological consequences of unregulated reversal unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined a protein-clearance activity and a damage-specific division of labor with SHPRH, explaining how HLTF prepares stalled forks for bypass.\",\n      \"evidence\": \"In vitro protein displacement assays (RPA/PCNA/RFC) and siRNA/Co-IP analyses of TLS polymerase recruitment\",\n      \"pmids\": [\"21795603\", \"21396873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism switching HLTF vs SHPRH after MMS not fully resolved\", \"Structural basis of protein displacement unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified USP7 as a stabilizing deubiquitinase, the first node showing HLTF abundance is post-translationally tuned to control PCNA ubiquitination.\",\n      \"evidence\": \"Co-IP, deubiquitination and half-life assays with PCNA ubiquitination readout\",\n      \"pmids\": [\"21845734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the counteracting degradative ligase\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed HLTF can promote RAD51-independent D-loop formation, providing a template-switch route for gap repair independent of ATP hydrolysis.\",\n      \"evidence\": \"In vitro D-loop and primer extension assays with ATPase/ATP-binding mutants\",\n      \"pmids\": [\"24198246\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of D-loop activity not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Solved how HLTF finds its substrate: the HIRAN OB-fold binds 3' ssDNA ends to recruit HLTF to stalled forks and direct translocase-driven fork reversal.\",\n      \"evidence\": \"Crystal structure of HIRAN-DNA, 3'-ssDNA binding and HIRAN-mutant fork reversal assays in vitro and in cells\",\n      \"pmids\": [\"26051180\", \"25858588\", \"26350214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how HIRAN coordinates with the motor at atomic level during translocation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked HLTF degradation to viral antagonism, showing HIV-1 Vpr exploits CRL4-DCAF1 to destroy HLTF independently of G2 arrest.\",\n      \"evidence\": \"Quantitative proteomics, proteasome-rescue Western blots, HIV-1 infection of primary T cells and macrophages\",\n      \"pmids\": [\"27114546\", \"27335459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Antiviral function of HLTF itself not yet demonstrated at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Provided a solution structure of the free HIRAN domain, revealing conformational heterogeneity at the DNA-binding site.\",\n      \"evidence\": \"Solution NMR structure determination\",\n      \"pmids\": [\"27771863\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional mutagenesis in this work\", \"Free-domain structure only\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Detailed the molecular interface of Vpr-driven degradation, showing Vpr loads HLTF onto DCAF1 by engaging the HIRAN DNA-binding residues.\",\n      \"evidence\": \"In vitro reconstitution of Vpr-dependent HLTF polyubiquitination plus structure-guided mutagenesis\",\n      \"pmids\": [\"29079575\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single lab\", \"Did not confirm HLTF antiviral phenotype\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Dissected the regulated mechanics of PCNA polyubiquitination, showing HIRAN-recruited HLTF couples to RAD6-RAD18 monoubiquitination and is steered between en bloc and sequential modes by RFC/PCNA.\",\n      \"evidence\": \"Reconstituted in vitro ligase assays with HIRAN mutants and RFC/PCNA competition\",\n      \"pmids\": [\"30335157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular relevance of the chain-elongation switch not directly tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Confirmed HLTF restricts HIV-1 replication, establishing it as a genuine restriction factor antagonized by Vpr.\",\n      \"evidence\": \"Pairwise HIV-1 replication competition with Vpr separation-of-function mutants and HLTF knockdown\",\n      \"pmids\": [\"31019079\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of restriction not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected HLTF to human disease by showing a familial-MDS germline E259K mutation disrupts E2 binding and PCNA polyubiquitination, causing DSB accumulation.\",\n      \"evidence\": \"Co-IP of E259K with MMS2/UBC13, PCNA ubiquitination and \\u03b3H2AX assays\",\n      \"pmids\": [\"30696947\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causality in MDS established only in cellular assays\", \"Single family/lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established HLTF as the gatekeeper of fork remodeling choice, with its loss diverting forks to PRIMPOL repriming and altering DSB/survival outcomes.\",\n      \"evidence\": \"Electron microscopy of fork structures, PRIMPOL/REV1 epistasis, fiber assays and DSB quantification in HLTF KO/HIRAN mutants\",\n      \"pmids\": [\"32442397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term genomic consequences of fork-reversal loss not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined the structural basis of HIRAN-initiated fork regression, showing it binds the 3'-OH and unwinds three nucleobases via Phe-142.\",\n      \"evidence\": \"Crystal structure of HIRAN-duplex DNA with Phe-142 mutagenesis\",\n      \"pmids\": [\"31960921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coupling of HIRAN unwinding to the ATPase motor still inferred\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed HLTF in the broader fork-protection network through interaction with PARP1 and co-recruitment with BRCA1/BARD1/RAD51, while defining its distinct dissociation behavior at collapsed forks.\",\n      \"evidence\": \"Co-IP, proximity ligation, DNA fiber analysis and immunofluorescence\",\n      \"pmids\": [\"33281189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect HLTF-PARP1 interaction not fully resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed APIM-mediated PCNA binding contributes to HLTF's TLS role and shapes UV mutation spectra, defining an additional PCNA-engagement mode.\",\n      \"evidence\": \"APIM mutant analysis, nuclear localization, SupF mutagenesis and PCNA binding assays\",\n      \"pmids\": [\"31973093\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of APIM vs HIRAN to fork engagement unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended HLTF's translocase function into nucleotide excision repair, showing it evicts the incision complex to enable PCNA loading and repair synthesis.\",\n      \"evidence\": \"Reconstituted NER system, HIRAN mutant analysis, PCNA loading and cellular NER kinetics\",\n      \"pmids\": [\"35271816\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution to NER efficiency across lesion types not quantified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a conserved HLTF-MSH2 interaction linking HLTF to mismatch-repair machinery, distinguishing it from SHPRH-MLH1.\",\n      \"evidence\": \"Co-IP in human and yeast, bioinformatic conservation analysis and yeast two-hybrid\",\n      \"pmids\": [\"35784486\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of HLTF-MSH2 in repair not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a Cas9-eviction activity, showing HLTF removes Cas9 from cleaved ends via HIRAN/translocase to license DSB processing.\",\n      \"evidence\": \"Reconstituted Cas9 displacement assays, single-molecule assays, HIRAN mutants and cellular DSB repair readouts\",\n      \"pmids\": [\"38987539\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous DNA-protein crosslinks are general substrates not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated HLTF unfolds genomic G-quadruplexes via its translocase and restrains PrimPol repriming at stabilized G4s.\",\n      \"evidence\": \"In vitro G4 unfolding, G4 immunofluorescence/CUT&RUN in HLTF-KO cells, PrimPol epistasis and fiber assays\",\n      \"pmids\": [\"39142279\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide impact on G4-associated instability not fully mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added DTX2 as a degradative ligase and supported a tumor-suppressor role for HLTF in glioma.\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination and knockdown/overexpression in glioma cells and xenografts\",\n      \"pmids\": [\"38163902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation signal/site on HLTF not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified \\u03b2-TrCP as a degradative ligase coupling HLTF loss to p62/mTOR-driven HCC tumorigenesis.\",\n      \"evidence\": \"Co-IP, ubiquitination assays, signaling readouts and patient tissue correlation\",\n      \"pmids\": [\"36822623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degron recognized by \\u03b2-TrCP not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a self-limiting axis where USP37 restrains HLTF accumulation at forks to prevent MRE11-dependent fork degradation.\",\n      \"evidence\": \"Co-IP, fiber assays, proximity ligation and USP37 KO + HLTF depletion epistasis\",\n      \"pmids\": [\"40548939\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether USP37 acts catalytically or by sequestration unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed that excess HLTF activity is pathological in checkpoint-deficient cells, where it attacks unprotected nascent ends and drives irreversible fork collapse.\",\n      \"evidence\": \"HLTF KO in checkpoint-deficient cells, fiber assays, ssDNA accumulation and genetic epistasis\",\n      \"pmids\": [\"40578346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic trigger distinguishing protective vs destructive HLTF action not fully defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a chromatin-modifying function, identifying HLTF as an H3K23 E3 ligase stimulated by H3K9me3 that limits chromatin accessibility and tumor growth via its RING domain.\",\n      \"evidence\": \"In vitro histone ubiquitination with MS site identification, RING-mutant xenografts, ATAC-seq and CUT&Tag\",\n      \"pmids\": [\"40680746\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reader/effector of H3K23Ub not identified\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined a transcriptional role in erythropoiesis, with HLTF and GATA1 forming a positive feedback loop that maintains erythroid chromatin accessibility.\",\n      \"evidence\": \"CUT&Tag, ATAC-seq, RNA-seq, Co-IP and GATA1-rescue of HLTF KO\",\n      \"pmids\": [\"41521666\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether HLTF acts here as remodeler, ligase, or sequence-specific factor not resolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Provided a mechanistic model for motor activation, showing fork binding and ATP induce HLTF dimerization required for unwinding and fork regression.\",\n      \"evidence\": \"Native mass spectrometry of HLTF-DNA complexes plus ATPase and fork regression assays\",\n      \"pmids\": [\"42030070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Dimer architecture and stoichiometry at forks not resolved structurally\", \"Single lab/novel method\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HLTF's distinct activities\\u2014fork reversal, NER eviction, Cas9 removal, G4 unfolding, PCNA and H3K23 ubiquitination, and transcription\\u2014are selectively deployed and regulated in a context-specific manner remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking enzymatic activity choice to substrate context\", \"Switch between protective and destructive fork action undefined\", \"Structural basis for transcription-factor vs translocase modes unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 2, 26, 32]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 16, 30]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 30]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 23, 19]},\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [1, 4, 26, 25]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [30]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [18, 31, 39, 40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 19, 20, 31]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [13, 28, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 14, 25]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [1, 2, 13, 28]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [30, 31]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [18, 31, 39, 40]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [21, 7, 9, 27, 34]}\n    ],\n    \"complexes\": [\"CRL4-DCAF1 (substrate of, via Vpr)\", \"p11/annexin A2 heterotetramer\"],\n    \"partners\": [\"PCNA\", \"RAD18\", \"UBC13\", \"MMS2\", \"USP7\", \"MSH2\", \"PARP1\", \"GATA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}