{"gene":"NEIL1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2003,"finding":"NEIL1 is a bifunctional DNA glycosylase/AP lyase that excises oxidatively damaged bases (including thymine glycol stereoisomers, FapyA, FapyG, 5,6-dihydrouracil) from DNA and initiates base excision repair; RNA interference knockdown of Neil1 in embryonic stem cells conferred sensitivity to gamma-irradiation.","method":"In vitro glycosylase assay with purified recombinant mNeil1, substrate specificity panel, RNAi knockdown + gamma-irradiation cell survival assay","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic reconstitution with multiple substrates, orthogonal RNAi cell-based functional validation, replicated by multiple labs","pmids":["12713815"],"is_preprint":false},{"year":2003,"finding":"NEIL1 (and NEIL2) preferentially excise oxidized base lesions from DNA bubble and single-stranded DNA substrates, in contrast to NTH1 and OGG1 which require duplex DNA; NEIL1 efficiently excises 5-hydroxyuracil from bubble and ssDNA but not 8-oxoguanine from bubble structures.","method":"In vitro DNA glycosylase assays comparing activity on duplex, bubble, and single-stranded DNA substrates; affinity binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with defined substrates, multiple substrate types tested, replicated by independent labs","pmids":["14522990"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of human NEIL1 revealed a 'zincless finger' motif — two antiparallel beta-strands mimicking the zinc-finger hairpin of Fpg/Nei family members but lacking zinc-coordinating residues; mutagenesis of a conserved arginine in this motif greatly reduces glycosylase activity, establishing the zincless finger as required for NEIL1 activity.","method":"X-ray crystallography; active-site mutagenesis with glycosylase activity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus functional mutagenesis in a single rigorous study","pmids":["15232006"],"is_preprint":false},{"year":2004,"finding":"Mouse NEIL1 specifically excises FapyGua and FapyAde from high-molecular-weight DNA containing multiple lesions generated by ionizing radiation, with equal specificity for both formamidopyrimidines; also excises thymine glycol and 5-hydroxy-5-methylhydantoin at lower rates.","method":"In vitro enzymatic assay on gamma-irradiated high-MW DNA; GC-MS quantification of released lesions","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution with GC-MS quantification, multiple substrates, replicated across labs","pmids":["15595846"],"is_preprint":false},{"year":2004,"finding":"NEIL1 stimulates OGG1 turnover at abasic (AP) sites by displacing bound OGG1 and performing beta-delta elimination at the AP site, analogous to APE1; this functional collaboration does not require stable protein–protein interaction between NEIL1 and OGG1.","method":"In vitro turnover/displacement assay; AP lyase activity assay; protein interaction assessment","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution in single lab, single set of methods","pmids":["15350146"],"is_preprint":false},{"year":2005,"finding":"NEIL1 and NEIL2 recognize and excise the further-oxidized 8-oxoG lesions guanidinohydantoin (Gh/Ia) and spiroiminodihydantoin (Sp) from both single-stranded and duplex DNA via beta- and delta-elimination mechanism; NEIL1 excises Sp from all four base contexts in duplex DNA.","method":"In vitro DNA glycosylase assays; DNA trapping studies; lesion-containing oligonucleotide substrates","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with chemically defined substrates, replicated by multiple labs","pmids":["15533836"],"is_preprint":false},{"year":2005,"finding":"NEIL1 excises oxidized base lesions located in close proximity (3' end) to a DNA single-strand break — a substrate that NTH1 and OGG1 cannot efficiently process.","method":"In vitro DNA glycosylase assay on oligonucleotide substrates with 3'-proximal lesions","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro biochemical assay, single lab","pmids":["16129732"],"is_preprint":false},{"year":2005,"finding":"Reactive oxygen species transcriptionally induce NEIL1 expression in human cells via CRE/AP-1 sites in the promoter that bind c-Jun and CREB/ATF2; oxidative stress increases binding of phospho-c-Jun to the NEIL1 promoter.","method":"Luciferase reporter assay; transcription start site mapping; EMSA with cell extracts; phospho-c-Jun immunoblot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays plus EMSA plus immunoblot, single lab, multiple orthogonal methods","pmids":["16118226"],"is_preprint":false},{"year":2007,"finding":"Human NEIL1 physically interacts with PCNA both in vivo and in vitro; PCNA stimulates NEIL1 glycosylase activity on 5-hydroxyuracil in ssDNA and fork-structured substrates by enhancing NEIL1 loading on substrate; the interaction domain maps to a C-terminal region (lacking canonical PIP box) conserved with DNA polymerase delta.","method":"Co-immunoprecipitation (in vivo and in vitro), mammalian two-hybrid, in vitro activity stimulation assay; domain-mapping by deletion mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP (in vivo + in vitro), mammalian two-hybrid, functional stimulation assay, domain mapping; multiple orthogonal methods replicated","pmids":["18032376"],"is_preprint":false},{"year":2007,"finding":"Werner syndrome protein (WRN) physically associates with NEIL1 (KD ~60 nM) via C-terminal residues 288–349 of NEIL1 and the RQC domain of WRN, independent of WRN helicase activity; WRN stimulates NEIL1 excision of oxidative lesions from bubble DNA; WRN-depleted cells accumulate 8-oxoG, FapyG, and FapyA, and combined WRN/NEIL1 knockdown does not show additive damage accumulation, placing WRN and NEIL1 in the same repair pathway.","method":"Co-immunoprecipitation; in vitro binding (Kd measurement); in vitro stimulation assay; nuclear co-localization; genetic epistasis via siRNA double-knockdown; lesion quantification by mass spectrometry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, quantitative binding, functional stimulation, genetic epistasis, multiple orthogonal methods in one study","pmids":["17611195"],"is_preprint":false},{"year":2007,"finding":"Human NEIL1 interacts with the 9-1-1 checkpoint clamp (Rad9-Rad1-Hus1) via residues 290–350; individual 9-1-1 subunits and the intact complex stimulate NEIL1 DNA glycosylase activity; NEIL1 nuclear foci co-localize with Rad9 foci after H2O2 treatment.","method":"Co-immunoprecipitation; in vitro binding and stimulation assay; nuclear co-localization by immunofluorescence; domain mapping","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, in vitro stimulation, co-localization, domain mapping; multiple orthogonal methods","pmids":["17395641"],"is_preprint":false},{"year":2008,"finding":"NEIL1 physically interacts with flap endonuclease 1 (FEN-1) via the disordered C-terminal region of NEIL1 (KD ~0.2 µM) and the disordered C-terminus of FEN-1; FEN-1 stimulates NEIL1 activity up to 5-fold on multiple DNA substrates; the interaction is required for efficient NEIL1-initiated long-patch BER.","method":"Co-immunoprecipitation from human cells; in vitro binding (Kd measurement); in vitro activity stimulation; domain-mapping; co-localization; in vitro LP-BER reconstitution","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of LP-BER, Co-IP, quantitative binding, stimulation assay, domain mapping; multiple orthogonal methods in one rigorous study","pmids":["18662981"],"is_preprint":false},{"year":2008,"finding":"Downregulation of NEIL1 by antisense oligonucleotides increases spontaneous mutation frequency ~3-fold at the Hprt locus (predominantly at A:T base pairs) and enhances mutation frequency ~7–8-fold under oxidative stress, demonstrating NEIL1 prevents mutagenesis at endogenous oxidized A and T lesions.","method":"Antisense oligonucleotide knockdown; Hprt mutation frequency assay; oxidative damage quantification","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined knockdown with specific mutational readout, two cell lines, single lab","pmids":["18495559"],"is_preprint":false},{"year":2009,"finding":"NEIL1 excises the unhooked psoralen-ICL fragment from a three-stranded DNA structure via glycosidic bond hydrolysis; complete short-patch BER reconstitution of the unhooked ICL was demonstrated in vitro, placing NEIL1 downstream of XPF/ERCC1 and translesion synthesis in ICL repair.","method":"In vitro DNA glycosylase assay on three-stranded crosslinked substrates; BER reconstitution assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of complete BER pathway on novel substrate, rigorous biochemical characterization","pmids":["19258314"],"is_preprint":false},{"year":2009,"finding":"CSB physically interacts with NEIL1 (co-immunoprecipitation, co-localization in HeLa cells) and stimulates NEIL1 incision activity in vitro; combined knockdown of CSB and NEIL1 strongly inhibits repair of FapyGua in cells; csb-/- mice accumulate higher endogenous FapyAde and FapyGua levels.","method":"Co-immunoprecipitation; co-localization; in vitro stimulation assay; shRNA double-knockdown; lesion quantification by mass spectrometry in knockout mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, co-localization, in vitro stimulation, genetic knockdown epistasis, in vivo lesion accumulation; multiple orthogonal methods","pmids":["19179336"],"is_preprint":false},{"year":2010,"finding":"RNA editing by ADAR1 converts lysine 242 to arginine in the lesion recognition loop of NEIL1, altering substrate specificity: the edited form removes thymine glycol from duplex DNA ~30-fold more slowly, while editing enhances repair of guanidinohydantoin. ADAR1 is the responsible editing enzyme acting on an A-C mismatch in an exon 6 / intron 5 hairpin.","method":"In vitro DNA glycosylase kinetic assay comparing edited vs unedited NEIL1; identification of editing enzyme by siRNA; interferon-alpha treatment of human cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic kinetics with purified proteins, mechanistic identification of editing enzyme, cellular validation; replicated in subsequent papers","pmids":["21068368"],"is_preprint":false},{"year":2010,"finding":"NEIL1 interacts with RPA (large subunit, KD ~20 nM) via NEIL1 C-terminal residues 312–349; RPA is present in the NEIL1 immunocomplex and increases after oxidative stress; RPA inhibits NEIL1 base excision activity on ssDNA at the replication fork, but this inhibition is relieved by PCNA.","method":"Co-immunoprecipitation; in vitro binding (Kd measurement); in vitro activity assay; domain-mapping by deletion mutants","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, quantitative binding assay, functional modulation assay, domain mapping; multiple orthogonal methods, single lab","pmids":["20338831"],"is_preprint":false},{"year":2010,"finding":"NEIL1 can efficiently remove 8-oxo-7,8-dihydroadenine (8-oxoAde) from 8-oxoAde:Cyt pairs in duplex DNA; in an in vitro reconstituted system NEIL1 causes abortive repair initiation (stops after base removal and strand cleavage), which is partially relieved by polynucleotide kinase/phosphatase.","method":"In vitro glycosylase assay; in vitro BER reconstitution","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution, single lab","pmids":["20214901"],"is_preprint":false},{"year":2010,"finding":"Genetic evidence (accumulation of R-cdA and S-cdA in neil1-/- mouse liver DNA but not ogg1-/- mice) suggests NEIL1 participates in nucleotide excision repair of 8,5'-cyclopurine lesions that cannot be repaired by BER, expanding NEIL1's repair repertoire beyond BER.","method":"Neil1-/- mouse knockout; lesion quantification by isotope-dilution GC-MS/MS","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout mouse model, quantitative lesion analysis by MS, single lab; mechanism inferred from accumulation rather than direct enzymatic reconstitution","pmids":["20067321"],"is_preprint":false},{"year":2012,"finding":"NEIL1 physically interacts with PARP-1: PARP-1 binds the C-terminal ~100 aa of NEIL1 and NEIL1 binds the BRCT domain of PARP-1; NEIL1 stimulates poly(ADP-ribosyl)ation activity of PARP-1 in vitro; PARP-1 inhibits NEIL1 incision activity in a concentration-dependent manner; NEIL1-deficient fibroblasts have impaired PAR formation after DNA damage, rescued by NEIL1 re-expression.","method":"In vitro binding assay; Co-immunoprecipitation; in vitro PAR activity assay; domain-mapping; cell-based rescue experiment","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vitro functional assays, cell-based rescue; single lab, multiple methods","pmids":["23104860"],"is_preprint":false},{"year":2012,"finding":"hnRNP-U directly interacts with NEIL1 via the C-terminal interaction domain (KD ~54 nM); hnRNP-U stimulates NEIL1 base excision activity on multiple DNA substrates by enhancing product release; depletion of hnRNP-U and NEIL1 epistatically sensitizes cells to low oxidative damage.","method":"Co-immunoprecipitation; in vitro binding (Kd); in vitro stimulation assay; siRNA epistasis; cell survival assay; CD spectroscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, quantitative binding, in vitro stimulation, epistatic knockdown with defined phenotype; multiple orthogonal methods","pmids":["22902625"],"is_preprint":false},{"year":2012,"finding":"Neil1 acts as a genetic modifier of CAG trinucleotide repeat (TNR) expansion; Neil1-/- mice show significantly reduced somatic and germline TNR expansions in R6/1 Huntington's disease model mice; purified NEIL1 binds and excises 5-hydroxycytosine from duplex DNA more efficiently than from hairpin substrates, suggesting NEIL1-initiated BER can trigger repeat expansion.","method":"Neil1-/- knockout mouse genetics; repeat expansion assay (mean repeat change, instability index); in vitro glycosylase activity on hairpin vs duplex substrates","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic modifier experiment in vivo plus in vitro biochemical confirmation; multiple orthogonal approaches","pmids":["22914735"],"is_preprint":false},{"year":2012,"finding":"NEIL1 excises oxidized guanine lesions Gh and Sp from quadruplex DNA with enhanced glycosylase activity on Gh in the telomeric sequence context; NEIL3 (not NEIL1) has activity on Tg in quadruplex DNA.","method":"In vitro DNA glycosylase assay on quadruplex DNA substrates containing defined lesions; comparison of five mammalian glycosylases","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with multiple enzymes and defined substrates, single lab","pmids":["23926102"],"is_preprint":false},{"year":2012,"finding":"NEIL1 biochemical mapping revealed that Pro2 and Lys54 are both involved in AP lyase activity (Schiff-base formation); residues Met81, Arg119, and Phe120 are essential for 8-oxoG removal; arginine and histidine residues in the zincless finger loop are required for lesion processing; the disordered C-terminal region harbors the interaction interface for partner proteins.","method":"Site-directed mutagenesis; in vitro DNA glycosylase/AP lyase assays; single-turnover kinetics; Schiff-base trapping","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis with quantitative kinetics and trapping experiments, rigorous active-site characterization","pmids":["22858590"],"is_preprint":false},{"year":2013,"finding":"NEIL1 is present in the DNA replication complex from human cells; NEIL1 associates with replication foci during S-phase and co-localizes with RPA-coated ssDNA template, inhibiting DNA polymerase delta synthesis upon encountering an oxidized base; NEIL1 deficiency slows nascent chain growth under oxidative stress; NEIL1 interacts with replication proteins RFC, pol delta, and DNA ligase I via its C-terminal domain.","method":"Gel filtration of nuclear extracts; co-immunoprecipitation; co-localization with BrdU/RPA foci; iPOND-like nascent chain analysis; in vitro primer extension inhibition; siRNA knockdown + BrdU incorporation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, co-localization, in vitro inhibition, cell-based functional readout) in a rigorous single-lab study","pmids":["23898192"],"is_preprint":false},{"year":2013,"finding":"The disordered C-terminal domain (CTD) of NEIL1 interacts intramolecularly with the folded domain, stabilizing the native protein structure; a Lys-rich cluster (residues 355–360) contributes to this electrostatic stabilization; SAXS confirms CTD flexibility; deletion of CTD reduces protein stability.","method":"Intrinsic fluorescence spectroscopy; SAXS; circular dichroism; stability assays with osmolytes; mutagenesis of Lys cluster","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — SAXS + spectroscopy + mutagenesis, single lab, multiple biophysical methods","pmids":["23542007"],"is_preprint":false},{"year":2015,"finding":"The C-terminal domain (CTD) of NEIL1 is required for BERosome complex formation with replication proteins (RFC, pol delta, DNA ligase I); NEIL1 lacking the CTD does not associate with chromatin or replication foci during S phase; CTD polypeptide acts as a dominant-negative inhibitor in vitro and sensitizes cells to ROS when ectopically expressed; RFC stimulates NEIL1 activity ~8-fold.","method":"Co-immunoprecipitation; chromatin fractionation; replication foci co-localization; in vitro BER reconstitution; dominant-negative expression; cell survival after ROS","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, chromatin fractionation, co-localization, in vitro reconstitution, dominant-negative cell biology); single rigorous study","pmids":["26134572"],"is_preprint":false},{"year":2016,"finding":"NEIL1 is polyubiquitylated by two E3 ubiquitin ligases, Mule and TRIM26, at C-terminal lysine residues; knockdown of either ligase stabilizes NEIL1 protein; ionizing radiation induces NEIL1 protein specifically in a Mule-dependent manner; stabilization of NEIL1 via TRIM26 knockdown increases cellular resistance to ionising radiation.","method":"Purification of E3 ligases from human cells; in vitro ubiquitylation assay; siRNA knockdown; protein stability assay; clonogenic survival after IR","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro ubiquitylation reconstitution, siRNA-based protein stability, cell-based phenotypic readout, two independent E3 ligases identified","pmids":["27924031"],"is_preprint":false},{"year":2017,"finding":"NEIL1 efficiently recognizes and excises the AFB1-Fapy-dG adduct from DNA in vitro; Neil1-/- mice show increased AFB1-Fapy-dG levels in liver DNA and are highly susceptible to AFB1-induced hepatocellular carcinoma (greater than XPA-/- mice deficient in NER).","method":"In vitro DNA glycosylase assay; AFB1-Fapy-dG quantification by mass spectrometry in neil1-/- mouse livers; carcinogenesis bioassay (tumor frequency and size) in neil1-/- vs WT vs xpa-/- mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution, in vivo lesion accumulation, in vivo carcinogenesis bioassay with multiple genotypes; orthogonal methods","pmids":["28373545"],"is_preprint":false},{"year":2017,"finding":"NEIL1 directly excises 5-carboxylcytosine (5caC) from dsDNA substrates; NEIL1 also stimulates TDG glycosylase activity on 5-formylcytosine (5fC) and 5caC substrates; NEIL1 provides AP lyase activity downstream of TDG glycosylase activity. Catalytically impaired NEIL1 P2T and E3Q mutants were used as controls.","method":"In vitro glycosylase assay with purified NEIL1 and catalytic mutants; in vitro reconstitution with TDG; substrate-specific activity assays on modified cytosine-containing dsDNA","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assays with active-site controls, single lab","pmids":["28827588"],"is_preprint":false},{"year":2017,"finding":"Human NEIL3 (and NEIL1) cleave psoralen-induced interstrand crosslinks in four-stranded DNA structures; NEIL1 cleaves to generate two unhooked duplexes with a nick, whereas NEIL3 targets both DNA strands without generating single-strand breaks.","method":"In vitro DNA glycosylase assay on three-stranded and four-stranded psoralen-crosslinked substrates; product characterization","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with defined substrates, single lab, novel substrate characterization","pmids":["29234069"],"is_preprint":false},{"year":2017,"finding":"NEIL1 destabilizes the PCNA homotrimer upon interaction; SEC, native gel electrophoresis, mass spectrometry, AFM, and SAXS together demonstrate formation of a 1:1:1 NEIL1-DNA-PCNA(monomer) complex, suggesting a mechanistic switch between replication and BER.","method":"Size exclusion chromatography; native gel electrophoresis; mass spectrometry; atomic force microscopy; SAXS; ab initio shape reconstruction","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal biophysical methods (SEC, MS, AFM, SAXS) all supporting same conclusion in one rigorous study","pmids":["27994037"],"is_preprint":false},{"year":2018,"finding":"NEIL1 is acetylated by histone acetyltransferase p300 predominantly at Lys 296, 297, and 298 in its C-terminal domain; acetylation is required for nuclear localization and chromatin association (non-acetylable 3KA mutant loses nuclear localization); acetylated NEIL1 is exclusively chromatin-bound; acetylation enhances glycosylase activity via increased product release; acetylation-defective cells show reduced BER complex formation and greater sensitivity to oxidative stress.","method":"In vitro acetylation assay; site-directed mutagenesis; subcellular fractionation; immunofluorescence; in vitro glycosylase activity; BER complex activity; cell survival assay","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — identified writer (p300), mapped modification sites, multiple functional consequences validated by mutagenesis and cell-based assays; multiple orthogonal methods","pmids":["29698889"],"is_preprint":false},{"year":2018,"finding":"NEIL1 is present in purified mitochondrial extracts; NEIL1 interacts with mitochondrial single-stranded DNA binding protein (mtSSB) via its C-terminal tail; in absence of DNA, NEIL1 disrupts the mtSSB homotetramer forming a smaller NEIL1-mtSSB monomer complex; in presence of DNA, a larger ternary complex forms.","method":"Mitochondrial fractionation; protein painting; far-western analysis; gel-filtration chromatography; MALS; SAXS","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biophysical methods confirming interaction and stoichiometry, detected NEIL1 in mitochondrial extracts; single lab","pmids":["29522991"],"is_preprint":false},{"year":2016,"finding":"JNK1 kinase interacts with NEIL1 in vitro and in immunoprecipitates, and phosphorylates NEIL1 at Ser207, Ser306, and Ser61; phosphomimetic mutation of Y263 yields a completely inactive enzyme; phosphorylation at S207, S306, and S61 does not affect DNA binding or enzyme activity.","method":"Mass spectrometry identification of phosphorylation sites; co-immunoprecipitation; in vitro kinase assay; mutagenesis plus activity assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase identified in Co-IP and in vitro, phosphosites mapped by MS, functional mutagenesis; single lab, multiple methods","pmids":["27518429"],"is_preprint":false},{"year":2019,"finding":"NEIL1 and NEIL2 protect mitochondrial DNA from oxidative damage during neural crest development; Neil-deficiency in Xenopus embryos and mouse ESCs causes a TP53-dependent DNA damage response and intrinsic apoptosis specifically in cranial neural crest cells; epistasis experiments rule out involvement of epigenetic DNA demethylation.","method":"Xenopus morpholino knockdown; mouse ESC differentiation; Neil1/2 knockout; TP53 epistasis; mitochondrial DNA damage measurement; apoptosis assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in two model systems, mechanistic dissection separating repair from demethylation roles, multiple orthogonal methods","pmids":["31566562"],"is_preprint":false},{"year":2019,"finding":"NEIL1 preferentially excises oxidized bases from double-stranded DNA including damage upstream of a replication fork, whereas NEIL3 preferentially excises from ssDNA and open fork structures; the two glycosylases act in concert at the replication fork.","method":"In vitro glycosylase assay on model replication fork substrates with site-specific lesions at defined positions relative to the fork","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with defined model substrates, comparative analysis of NEIL1 and NEIL3, single lab","pmids":["31018584"],"is_preprint":false},{"year":2019,"finding":"NEIL1 kinetics on AFB1-Fapy-dG and NM-Fapy-dG adducts: unedited NEIL1 (K242) has ~1.4-fold higher rate than edited K242R on AFB1-Fapy-dG; the differential is large for ThyGly excision (7.5–12-fold) and 5-OHC (~3–5-fold); both forms preferentially release FapyAde and FapyGua from gamma-irradiated DNA.","method":"In vitro glycosylase assay; GC-MS/MS quantification of released lesions; molecular modeling","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic kinetics with MS quantification, systematic substrate comparison; single lab","pmids":["31733589"],"is_preprint":false},{"year":2022,"finding":"NEIL1 interacts with mitochondrial transcription factor A (TFAM) via both its N- and C-terminal domains; the interaction is transient and enhanced by the presence of DNA; NEIL1 disrupts TFAM-DNA complex interactions; TFAM-transcribed mitochondrial gene expression is reduced in the absence of NEIL1 under DNA damage conditions.","method":"Biochemical co-precipitation; hydrogen-deuterium exchange mass spectrometry; MALS; gel filtration; mRNA expression analysis in NEIL1-deficient cells","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — HDX-MS, MALS, gel filtration, cell-based functional readout; single lab, multiple methods","pmids":["35938152"],"is_preprint":false},{"year":2024,"finding":"Neil1-/- mice challenged with AFB1 show significantly increased mutation frequencies in nuclear (but not mitochondrial) liver genomes; mutation spectra in neil1-/- mice match AFB1-specific COSMIC signature SBS24, confirming NEIL1 limits AFB1-induced mutagenesis and carcinogenesis in vivo.","method":"Neil1-/- knockout mice; AFB1 challenge; duplex sequencing of liver DNA; tumor bioassay","journal":"NAR molecular medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — duplex sequencing provides high-resolution mutagenesis data in vivo in knockout mice, corroborated by carcinogenesis assay; replicates prior findings with higher resolution method","pmids":["38779538"],"is_preprint":false}],"current_model":"NEIL1 is a bifunctional DNA glycosylase/AP lyase that excises a broad spectrum of oxidized base lesions (formamidopyrimidines, thymine glycol, 5-hydroxyuracil, hydantoin lesions, and bulky adducts such as AFB1-FapyGua) from duplex, single-stranded, bubble, and fork-structured DNA via beta,delta-elimination, initiating base excision repair; it is activated during S phase, interacts via its disordered C-terminal domain with a network of replication (PCNA, RFC, pol delta, FEN-1, RPA, ligase I) and repair (WRN, CSB, 9-1-1 complex, hnRNP-U, PARP-1) proteins to form a BERosome that enables pre-replicative repair of oxidized bases ahead of the replication fork; its activity and nuclear localization are regulated by post-translational modifications including acetylation by p300 (required for chromatin association) and ubiquitylation by Mule/TRIM26 (controlling steady-state levels), and its substrate specificity is tuned by ADAR1-mediated RNA editing at codon 242 (Lys→Arg); in mitochondria, NEIL1 also interacts with mtSSB and TFAM to maintain mitochondrial genome integrity, and its absence in mice leads to metabolic syndrome, increased cancer susceptibility, and neurological deficits."},"narrative":{"mechanistic_narrative":"NEIL1 is a bifunctional DNA glycosylase/AP lyase that initiates base excision repair by excising a broad spectrum of oxidatively damaged bases — including thymine glycol, FapyA/FapyG formamidopyrimidines, 5-hydroxyuracil, dihydrouracil, and the further-oxidized hydantoin lesions guanidinohydantoin and spiroiminodihydantoin — via beta,delta-elimination, with cellular loss conferring sensitivity to oxidative and ionizing-radiation damage [PMID:12713815, PMID:15595846, PMID:15533836]. Unlike NTH1 and OGG1, it efficiently processes lesions in single-stranded, bubble, and fork-structured DNA as well as duplex, quadruplex, and three-/four-stranded crosslinked substrates, extending its repertoire to psoralen interstrand crosslink unhooking and to 8,5'-cyclopurine and AFB1-Fapy-dG adducts [PMID:14522990, PMID:19258314, PMID:20067321, PMID:28373545, PMID:29234069]. Its catalytic mechanism depends on an N-terminal Pro2/Lys54 nucleophile and a 'zincless finger' motif in which a conserved arginine, rather than coordinated zinc, is required for activity [PMID:15232006, PMID:22858590]. NEIL1 functions as a replication-coupled repair factor: it is recruited to S-phase replication foci and assembles a 'BERosome' through its intrinsically disordered C-terminal domain, which mediates interactions with replication and repair proteins including PCNA, RFC, pol delta, FEN-1, RPA, DNA ligase I, WRN, CSB, the 9-1-1 clamp, hnRNP-U, and PARP-1, most of which reciprocally stimulate its glycosylase activity to enable pre-replicative repair of oxidized bases ahead of the fork [PMID:18032376, PMID:17611195, PMID:17395641, PMID:18662981, PMID:20338831, PMID:22902625, PMID:23898192, PMID:26134572]. NEIL1 activity, abundance, and localization are tuned by post-translational and RNA-level controls: p300 acetylation of C-terminal lysines drives chromatin association and enhances activity [PMID:29698889], Mule- and TRIM26-mediated polyubiquitylation governs steady-state protein levels and radiation resistance [PMID:27924031], and ADAR1 RNA editing at codon 242 (Lys→Arg) reshapes substrate specificity [PMID:21068368]. NEIL1 additionally localizes to mitochondria, where it interacts with mtSSB and TFAM to support mitochondrial genome integrity and gene expression [PMID:29522991, PMID:35938152]. In vivo, Neil1 deficiency increases endogenous lesion burden, raises mutation frequency, modifies trinucleotide repeat instability, and confers strong susceptibility to AFB1-induced hepatocellular carcinoma with a characteristic mutational signature [PMID:18495559, PMID:22914735, PMID:28373545, PMID:38779538].","teleology":[{"year":2003,"claim":"Established NEIL1 as a functional DNA repair enzyme by defining it as a bifunctional glycosylase/AP lyase that excises oxidized bases and protects cells from oxidative DNA damage.","evidence":"In vitro glycosylase assays on a substrate panel plus RNAi knockdown with gamma-irradiation survival in embryonic stem cells","pmids":["12713815"],"confidence":"High","gaps":["Did not resolve preference among substrate classes","Cellular pathway context and partners unknown"]},{"year":2003,"claim":"Distinguished NEIL1 from other glycosylases by showing it preferentially acts on non-duplex DNA (bubble and ssDNA), hinting at a replication/transcription-coupled role.","evidence":"Comparative in vitro glycosylase and binding assays across duplex, bubble, and ssDNA substrates","pmids":["14522990"],"confidence":"High","gaps":["Did not identify the in vivo source of such structures","No partner proteins linking NEIL1 to replication forks yet"]},{"year":2004,"claim":"Defined the structural basis of catalysis by identifying a 'zincless finger' motif required for activity, explaining how NEIL1 engages lesions without a canonical zinc finger.","evidence":"X-ray crystallography of human NEIL1 with active-site mutagenesis and activity assays","pmids":["15232006"],"confidence":"High","gaps":["No lesion-bound or full-length structure including the disordered C-terminus","Mechanism of broad substrate recognition not fully resolved"]},{"year":2004,"claim":"Extended the catalogue of physiological substrates and showed NEIL1 can functionally relieve OGG1 product inhibition, positioning it within the broader BER network.","evidence":"In vitro assays on gamma-irradiated DNA with GC-MS quantification and OGG1 turnover/displacement assays","pmids":["15595846","15350146"],"confidence":"High","gaps":["OGG1 cooperation shown without stable physical interaction (Medium)","Physiological significance of OGG1 displacement untested in cells"]},{"year":2005,"claim":"Broadened NEIL1's lesion spectrum to hyperoxidized guanine products and lesions near strand breaks, defining substrates other glycosylases cannot process.","evidence":"In vitro glycosylase and trapping assays on Gh/Sp and 3'-proximal-lesion oligonucleotides","pmids":["15533836","16129732"],"confidence":"High","gaps":["3'-proximal-lesion processing replicated in only one lab (Medium)","In vivo relevance of hydantoin repair not established here"]},{"year":2005,"claim":"Identified the transcriptional control of NEIL1, showing oxidative stress induces it via CRE/AP-1 promoter elements binding c-Jun and CREB/ATF2.","evidence":"Luciferase reporters, transcription start mapping, EMSA, and phospho-c-Jun immunoblot in human cells","pmids":["16118226"],"confidence":"Medium","gaps":["Single-lab promoter analysis","Whether induction measurably alters repair capacity not shown"]},{"year":2007,"claim":"Connected NEIL1 mechanistically to DNA replication by demonstrating direct, activity-stimulating interactions with PCNA, WRN, and the 9-1-1 clamp through its C-terminal domain.","evidence":"Reciprocal Co-IP, quantitative binding, in vitro stimulation, co-localization, domain mapping, and siRNA epistasis","pmids":["18032376","17611195","17395641"],"confidence":"High","gaps":["C-terminal interaction interface lacks a canonical PIP box, recruitment mechanism unresolved","Spatiotemporal ordering of these interactions at the fork unknown"]},{"year":2008,"claim":"Linked NEIL1 to long-patch BER via FEN-1 and demonstrated its endogenous anti-mutator role at oxidized A:T sites.","evidence":"Co-IP, quantitative binding, LP-BER reconstitution, and Hprt mutation-frequency assay under oxidative stress","pmids":["18662981","18495559"],"confidence":"High","gaps":["Hprt mutation study used antisense knockdown in a single lab (Medium)","Relative contribution of short- vs long-patch BER in cells unquantified"]},{"year":2009,"claim":"Expanded NEIL1's pathway roles into interstrand crosslink repair and showed CSB-stimulated FapyGua repair, embedding NEIL1 in transcription-coupled and crosslink repair.","evidence":"In vitro BER reconstitution on crosslinked substrates; Co-IP, stimulation, double-knockdown epistasis, and knockout-mouse lesion quantification for CSB","pmids":["19258314","19179336"],"confidence":"High","gaps":["In vivo coupling of NEIL1 to XPF/ERCC1 ICL repair not directly tested","How CSB recruits NEIL1 to chromatin unknown"]},{"year":2010,"claim":"Revealed multilayered regulation of NEIL1 at the fork and at the RNA level — RPA inhibition relieved by PCNA, and ADAR1 RNA editing reprogramming substrate specificity.","evidence":"Co-IP, quantitative binding, modulation assays for RPA; in vitro kinetics of edited vs unedited NEIL1 with ADAR1 identification by siRNA","pmids":["20338831","21068368","20214901"],"confidence":"High","gaps":["8-oxoAde abortive-repair finding is Medium-confidence single-lab","Physiological fraction of edited NEIL1 in tissues not established"]},{"year":2010,"claim":"Implicated NEIL1 in a BER-independent NER-like pathway for cyclopurine lesions, broadening its repair repertoire.","evidence":"Lesion accumulation (R/S-cdA) in Neil1-/- but not Ogg1-/- mouse liver by GC-MS/MS","pmids":["20067321"],"confidence":"Medium","gaps":["Mechanism inferred from accumulation, not enzymatic reconstitution","Direct NEIL1 role in NER not demonstrated"]},{"year":2012,"claim":"Defined further partner interactions (PARP-1, hnRNP-U) and a disease-modifier role, with systematic mapping of catalytic residues.","evidence":"Co-IP, binding, stimulation, epistasis for PARP-1/hnRNP-U; Neil1-/- HD-model repeat-expansion genetics; site-directed mutagenesis with single-turnover kinetics","pmids":["23104860","22902625","22914735","22858590","23926102"],"confidence":"High","gaps":["PARP-1 interaction is Medium-confidence single-lab","How NEIL1-initiated BER mechanistically drives repeat expansion in vivo not fully resolved"]},{"year":2013,"claim":"Established NEIL1 as a replication-fork-resident repair factor that performs pre-replicative repair, interacting with the replication machinery via its C-terminus.","evidence":"Gel filtration, Co-IP with RFC/pol delta/ligase I, co-localization with RPA/BrdU foci, in vitro primer-extension inhibition, and nascent-chain analysis","pmids":["23898192"],"confidence":"High","gaps":["Whether fork-coupled repair is the dominant cellular pathway not quantified","Trigger for NEIL1 fork recruitment unresolved"]},{"year":2013,"claim":"Characterized the disordered C-terminal domain as an intramolecular stabilizer, providing biophysical basis for its dual structural and interaction-hub roles.","evidence":"Intrinsic fluorescence, SAXS, CD, osmolyte stability assays, and Lys-cluster mutagenesis","pmids":["23542007"],"confidence":"Medium","gaps":["Single-lab biophysical study","Link between CTD-mediated stability and in-cell function not directly shown"]},{"year":2015,"claim":"Demonstrated the C-terminal domain is essential for assembling the replication-coupled 'BERosome' and chromatin/foci association, with a CTD fragment acting as dominant-negative.","evidence":"Co-IP, chromatin fractionation, foci co-localization, in vitro BER reconstitution, and dominant-negative ROS-sensitivity in cells","pmids":["26134572"],"confidence":"High","gaps":["Stoichiometry and architecture of the assembled BERosome unresolved","Order of partner assembly during S phase unknown"]},{"year":2016,"claim":"Identified JNK1 phosphorylation of NEIL1 and a phosphomimetic Y263 inactivating site, adding a kinase-signaling layer to NEIL1 regulation.","evidence":"MS phosphosite mapping, Co-IP, in vitro kinase assay, and mutagenesis activity assays","pmids":["27518429"],"confidence":"Medium","gaps":["Functional role of S61/S207/S306 phosphorylation unclear (no effect on activity)","Y263 modification status in cells not demonstrated"]},{"year":2016,"claim":"Defined ubiquitin-dependent control of NEIL1 abundance, linking its turnover to radiation resistance.","evidence":"In vitro ubiquitylation, siRNA stability assays for Mule and TRIM26, and clonogenic survival after IR","pmids":["27924031"],"confidence":"High","gaps":["Signals triggering ligase selection between Mule and TRIM26 unknown","Deubiquitylase counterpart not identified"]},{"year":2017,"claim":"Mechanistically tied NEIL1 to the replication-to-repair switch and to epigenetic demethylation, and expanded crosslink and adduct substrates.","evidence":"Biophysical demonstration of NEIL1-driven PCNA trimer destabilization (SEC/MS/AFM/SAXS); in vitro assays on 5caC/TDG, AFB1-Fapy-dG, and four-stranded ICLs; Neil1-/- mouse carcinogenesis bioassay","pmids":["27994037","28827588","28373545","29234069"],"confidence":"High","gaps":["5caC/TDG cooperation and four-stranded ICL processing are Medium-confidence single-lab","In vivo significance of PCNA monomerization not directly tested"]},{"year":2018,"claim":"Established acetylation as a master regulator coupling NEIL1 localization to function and demonstrated mitochondrial localization with mtSSB interaction.","evidence":"In vitro p300 acetylation, site mutagenesis, fractionation/IF, and activity/survival assays; mitochondrial fractionation with protein-painting, far-western, MALS, and SAXS for mtSSB","pmids":["29698889","29522991"],"confidence":"High","gaps":["mtSSB interaction is Medium-confidence single-lab","Deacetylase and dynamic regulation of acetylation in vivo not defined"]},{"year":2019,"claim":"Defined a developmental and mitochondrial-protective role and refined the division of labor between NEIL1 and NEIL3 at replication forks.","evidence":"Xenopus/mouse ESC Neil knockout with TP53 epistasis and mtDNA damage assays; comparative in vitro fork-substrate glycosylase assays and AFB1/NM-Fapy-dG kinetics","pmids":["31566562","31018584","31733589"],"confidence":"High","gaps":["Fork division-of-labor and edited-NEIL1 kinetics are Medium-confidence in vitro models","How mtDNA repair couples to neural crest survival mechanistically not fully resolved"]},{"year":2022,"claim":"Linked NEIL1 to mitochondrial transcription by showing it interacts with TFAM and modulates TFAM-DNA complexes and mitochondrial gene expression under damage.","evidence":"Co-precipitation, HDX-MS, MALS, gel filtration, and mRNA expression in NEIL1-deficient cells","pmids":["35938152"],"confidence":"Medium","gaps":["Single-lab, transient interaction","Whether the effect reflects repair or a direct transcriptional role is unresolved"]},{"year":2024,"claim":"Provided high-resolution in vivo confirmation that NEIL1 suppresses AFB1-induced nuclear mutagenesis matching a defined COSMIC signature.","evidence":"Duplex sequencing of Neil1-/- mouse liver after AFB1 with tumor bioassay","pmids":["38779538"],"confidence":"High","gaps":["Why mitochondrial genome was not similarly affected unexplained","Human relevance of the mouse mutational signature not directly tested"]},{"year":null,"claim":"How the BERosome is spatiotemporally assembled and how the multiple regulatory layers (acetylation, ubiquitylation, phosphorylation, RNA editing) are integrated to direct NEIL1 between nuclear replication-coupled repair and mitochondrial maintenance remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated structure of the assembled NEIL1 BERosome","Hierarchy and crosstalk among PTMs not established","Determinants of nuclear vs mitochondrial partitioning unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[0,1,3,5,13,23,28,29]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,2,23]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,5,16,21]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,19,29,38]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[24,26,32]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[26,32]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[33,35,38]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,11,13,26]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[8,16,24,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[28,39]}],"complexes":["BERosome (NEIL1-replication/repair protein complex)","9-1-1 (Rad9-Rad1-Hus1) clamp-associated"],"partners":["PCNA","FEN1","WRN","CSB","RPA","HNRNPU","PARP1","TFAM"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96FI4","full_name":"Endonuclease 8-like 1","aliases":["DNA glycosylase/AP lyase Neil1","DNA-(apurinic or apyrimidinic site) lyase Neil1","Endonuclease VIII-like 1","FPG1","Nei homolog 1","NEH1","Nei-like protein 1"],"length_aa":390,"mass_kda":43.7,"function":"Involved in base excision repair of DNA damaged by oxidation or by mutagenic agents. Acts as a DNA glycosylase that recognizes and removes damaged bases. Has a preference for oxidized pyrimidines, such as thymine glycol, formamidopyrimidine (Fapy) and 5-hydroxyuracil. Has marginal activity towards 8-oxoguanine. Has AP (apurinic/apyrimidinic) lyase activity and introduces nicks in the DNA strand. Cleaves the DNA backbone by beta-delta elimination to generate a single-strand break at the site of the removed base with both 3'- and 5'-phosphates. Has DNA glycosylase/lyase activity towards mismatched uracil and thymine, in particular in U:C and T:C mismatches. Specifically binds 5-hydroxymethylcytosine (5hmC), suggesting that it acts as a specific reader of 5hmC","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q96FI4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NEIL1","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":[],"url":"https://opencell.sf.czbiohub.org/search/NEIL1","total_profiled":1310},"omim":[{"mim_id":"608934","title":"ENDONUCLEASE VIII-LIKE 3; NEIL3","url":"https://www.omim.org/entry/608934"},{"mim_id":"608933","title":"ENDONUCLEASE VIII-LIKE 2; NEIL2","url":"https://www.omim.org/entry/608933"},{"mim_id":"608844","title":"NEI-LIKE DNA GLYCOSYLASE 1; NEIL1","url":"https://www.omim.org/entry/608844"},{"mim_id":"605552","title":"ABDOMINAL OBESITY-METABOLIC SYNDROME 1; AOMS1","url":"https://www.omim.org/entry/605552"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NEIL1"},"hgnc":{"alias_symbol":["FLJ22402","hFPG1","NEI1","FPG1"],"prev_symbol":[]},"alphafold":{"accession":"Q96FI4","domains":[{"cath_id":"3.20.190.10","chopping":"5-126","consensus_level":"high","plddt":97.279,"start":5,"end":126},{"cath_id":"1.10.8.50","chopping":"142-298","consensus_level":"high","plddt":89.2683,"start":142,"end":298}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FI4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FI4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FI4-F1-predicted_aligned_error_v6.png","plddt_mean":80.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NEIL1","jax_strain_url":"https://www.jax.org/strain/search?query=NEIL1"},"sequence":{"accession":"Q96FI4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96FI4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96FI4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FI4"}},"corpus_meta":[{"pmid":"14522990","id":"PMC_14522990","title":"Repair of oxidized bases in DNA bubble structures by human DNA glycosylases NEIL1 and NEIL2.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14522990","citation_count":294,"is_preprint":false},{"pmid":"16446448","id":"PMC_16446448","title":"The metabolic syndrome resulting from a knockout of the NEIL1 DNA glycosylase.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16446448","citation_count":211,"is_preprint":false},{"pmid":"16221681","id":"PMC_16221681","title":"Repair of formamidopyrimidines in DNA involves different glycosylases: role of the OGG1, NTH1, and NEIL1 enzymes.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16221681","citation_count":174,"is_preprint":false},{"pmid":"12713815","id":"PMC_12713815","title":"The novel DNA glycosylase, NEIL1, protects mammalian cells from radiation-mediated cell death.","date":"2003","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/12713815","citation_count":159,"is_preprint":false},{"pmid":"15533836","id":"PMC_15533836","title":"Recognition of the oxidized lesions spiroiminodihydantoin and guanidinohydantoin in DNA by the mammalian base excision repair glycosylases NEIL1 and NEIL2.","date":"2005","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/15533836","citation_count":141,"is_preprint":false},{"pmid":"21068368","id":"PMC_21068368","title":"RNA editing changes the lesion specificity for the DNA repair enzyme NEIL1.","date":"2010","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/21068368","citation_count":136,"is_preprint":false},{"pmid":"18032376","id":"PMC_18032376","title":"Interaction of the human DNA glycosylase NEIL1 with proliferating cell nuclear antigen. 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purified recombinant mNeil1, substrate specificity panel, RNAi knockdown + gamma-irradiation cell survival assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic reconstitution with multiple substrates, orthogonal RNAi cell-based functional validation, replicated by multiple labs\",\n      \"pmids\": [\"12713815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NEIL1 (and NEIL2) preferentially excise oxidized base lesions from DNA bubble and single-stranded DNA substrates, in contrast to NTH1 and OGG1 which require duplex DNA; NEIL1 efficiently excises 5-hydroxyuracil from bubble and ssDNA but not 8-oxoguanine from bubble structures.\",\n      \"method\": \"In vitro DNA glycosylase assays comparing activity on duplex, bubble, and single-stranded DNA substrates; affinity binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with defined substrates, multiple substrate types tested, replicated by independent labs\",\n      \"pmids\": [\"14522990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of human NEIL1 revealed a 'zincless finger' motif — two antiparallel beta-strands mimicking the zinc-finger hairpin of Fpg/Nei family members but lacking zinc-coordinating residues; mutagenesis of a conserved arginine in this motif greatly reduces glycosylase activity, establishing the zincless finger as required for NEIL1 activity.\",\n      \"method\": \"X-ray crystallography; active-site mutagenesis with glycosylase activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus functional mutagenesis in a single rigorous study\",\n      \"pmids\": [\"15232006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse NEIL1 specifically excises FapyGua and FapyAde from high-molecular-weight DNA containing multiple lesions generated by ionizing radiation, with equal specificity for both formamidopyrimidines; also excises thymine glycol and 5-hydroxy-5-methylhydantoin at lower rates.\",\n      \"method\": \"In vitro enzymatic assay on gamma-irradiated high-MW DNA; GC-MS quantification of released lesions\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution with GC-MS quantification, multiple substrates, replicated across labs\",\n      \"pmids\": [\"15595846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NEIL1 stimulates OGG1 turnover at abasic (AP) sites by displacing bound OGG1 and performing beta-delta elimination at the AP site, analogous to APE1; this functional collaboration does not require stable protein–protein interaction between NEIL1 and OGG1.\",\n      \"method\": \"In vitro turnover/displacement assay; AP lyase activity assay; protein interaction assessment\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution in single lab, single set of methods\",\n      \"pmids\": [\"15350146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NEIL1 and NEIL2 recognize and excise the further-oxidized 8-oxoG lesions guanidinohydantoin (Gh/Ia) and spiroiminodihydantoin (Sp) from both single-stranded and duplex DNA via beta- and delta-elimination mechanism; NEIL1 excises Sp from all four base contexts in duplex DNA.\",\n      \"method\": \"In vitro DNA glycosylase assays; DNA trapping studies; lesion-containing oligonucleotide substrates\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with chemically defined substrates, replicated by multiple labs\",\n      \"pmids\": [\"15533836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NEIL1 excises oxidized base lesions located in close proximity (3' end) to a DNA single-strand break — a substrate that NTH1 and OGG1 cannot efficiently process.\",\n      \"method\": \"In vitro DNA glycosylase assay on oligonucleotide substrates with 3'-proximal lesions\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biochemical assay, single lab\",\n      \"pmids\": [\"16129732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Reactive oxygen species transcriptionally induce NEIL1 expression in human cells via CRE/AP-1 sites in the promoter that bind c-Jun and CREB/ATF2; oxidative stress increases binding of phospho-c-Jun to the NEIL1 promoter.\",\n      \"method\": \"Luciferase reporter assay; transcription start site mapping; EMSA with cell extracts; phospho-c-Jun immunoblot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays plus EMSA plus immunoblot, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16118226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human NEIL1 physically interacts with PCNA both in vivo and in vitro; PCNA stimulates NEIL1 glycosylase activity on 5-hydroxyuracil in ssDNA and fork-structured substrates by enhancing NEIL1 loading on substrate; the interaction domain maps to a C-terminal region (lacking canonical PIP box) conserved with DNA polymerase delta.\",\n      \"method\": \"Co-immunoprecipitation (in vivo and in vitro), mammalian two-hybrid, in vitro activity stimulation assay; domain-mapping by deletion mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP (in vivo + in vitro), mammalian two-hybrid, functional stimulation assay, domain mapping; multiple orthogonal methods replicated\",\n      \"pmids\": [\"18032376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Werner syndrome protein (WRN) physically associates with NEIL1 (KD ~60 nM) via C-terminal residues 288–349 of NEIL1 and the RQC domain of WRN, independent of WRN helicase activity; WRN stimulates NEIL1 excision of oxidative lesions from bubble DNA; WRN-depleted cells accumulate 8-oxoG, FapyG, and FapyA, and combined WRN/NEIL1 knockdown does not show additive damage accumulation, placing WRN and NEIL1 in the same repair pathway.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding (Kd measurement); in vitro stimulation assay; nuclear co-localization; genetic epistasis via siRNA double-knockdown; lesion quantification by mass spectrometry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, quantitative binding, functional stimulation, genetic epistasis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17611195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human NEIL1 interacts with the 9-1-1 checkpoint clamp (Rad9-Rad1-Hus1) via residues 290–350; individual 9-1-1 subunits and the intact complex stimulate NEIL1 DNA glycosylase activity; NEIL1 nuclear foci co-localize with Rad9 foci after H2O2 treatment.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding and stimulation assay; nuclear co-localization by immunofluorescence; domain mapping\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, in vitro stimulation, co-localization, domain mapping; multiple orthogonal methods\",\n      \"pmids\": [\"17395641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NEIL1 physically interacts with flap endonuclease 1 (FEN-1) via the disordered C-terminal region of NEIL1 (KD ~0.2 µM) and the disordered C-terminus of FEN-1; FEN-1 stimulates NEIL1 activity up to 5-fold on multiple DNA substrates; the interaction is required for efficient NEIL1-initiated long-patch BER.\",\n      \"method\": \"Co-immunoprecipitation from human cells; in vitro binding (Kd measurement); in vitro activity stimulation; domain-mapping; co-localization; in vitro LP-BER reconstitution\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of LP-BER, Co-IP, quantitative binding, stimulation assay, domain mapping; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"18662981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Downregulation of NEIL1 by antisense oligonucleotides increases spontaneous mutation frequency ~3-fold at the Hprt locus (predominantly at A:T base pairs) and enhances mutation frequency ~7–8-fold under oxidative stress, demonstrating NEIL1 prevents mutagenesis at endogenous oxidized A and T lesions.\",\n      \"method\": \"Antisense oligonucleotide knockdown; Hprt mutation frequency assay; oxidative damage quantification\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined knockdown with specific mutational readout, two cell lines, single lab\",\n      \"pmids\": [\"18495559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NEIL1 excises the unhooked psoralen-ICL fragment from a three-stranded DNA structure via glycosidic bond hydrolysis; complete short-patch BER reconstitution of the unhooked ICL was demonstrated in vitro, placing NEIL1 downstream of XPF/ERCC1 and translesion synthesis in ICL repair.\",\n      \"method\": \"In vitro DNA glycosylase assay on three-stranded crosslinked substrates; BER reconstitution assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of complete BER pathway on novel substrate, rigorous biochemical characterization\",\n      \"pmids\": [\"19258314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CSB physically interacts with NEIL1 (co-immunoprecipitation, co-localization in HeLa cells) and stimulates NEIL1 incision activity in vitro; combined knockdown of CSB and NEIL1 strongly inhibits repair of FapyGua in cells; csb-/- mice accumulate higher endogenous FapyAde and FapyGua levels.\",\n      \"method\": \"Co-immunoprecipitation; co-localization; in vitro stimulation assay; shRNA double-knockdown; lesion quantification by mass spectrometry in knockout mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, co-localization, in vitro stimulation, genetic knockdown epistasis, in vivo lesion accumulation; multiple orthogonal methods\",\n      \"pmids\": [\"19179336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RNA editing by ADAR1 converts lysine 242 to arginine in the lesion recognition loop of NEIL1, altering substrate specificity: the edited form removes thymine glycol from duplex DNA ~30-fold more slowly, while editing enhances repair of guanidinohydantoin. ADAR1 is the responsible editing enzyme acting on an A-C mismatch in an exon 6 / intron 5 hairpin.\",\n      \"method\": \"In vitro DNA glycosylase kinetic assay comparing edited vs unedited NEIL1; identification of editing enzyme by siRNA; interferon-alpha treatment of human cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic kinetics with purified proteins, mechanistic identification of editing enzyme, cellular validation; replicated in subsequent papers\",\n      \"pmids\": [\"21068368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NEIL1 interacts with RPA (large subunit, KD ~20 nM) via NEIL1 C-terminal residues 312–349; RPA is present in the NEIL1 immunocomplex and increases after oxidative stress; RPA inhibits NEIL1 base excision activity on ssDNA at the replication fork, but this inhibition is relieved by PCNA.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding (Kd measurement); in vitro activity assay; domain-mapping by deletion mutants\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, quantitative binding assay, functional modulation assay, domain mapping; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"20338831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NEIL1 can efficiently remove 8-oxo-7,8-dihydroadenine (8-oxoAde) from 8-oxoAde:Cyt pairs in duplex DNA; in an in vitro reconstituted system NEIL1 causes abortive repair initiation (stops after base removal and strand cleavage), which is partially relieved by polynucleotide kinase/phosphatase.\",\n      \"method\": \"In vitro glycosylase assay; in vitro BER reconstitution\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution, single lab\",\n      \"pmids\": [\"20214901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Genetic evidence (accumulation of R-cdA and S-cdA in neil1-/- mouse liver DNA but not ogg1-/- mice) suggests NEIL1 participates in nucleotide excision repair of 8,5'-cyclopurine lesions that cannot be repaired by BER, expanding NEIL1's repair repertoire beyond BER.\",\n      \"method\": \"Neil1-/- mouse knockout; lesion quantification by isotope-dilution GC-MS/MS\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout mouse model, quantitative lesion analysis by MS, single lab; mechanism inferred from accumulation rather than direct enzymatic reconstitution\",\n      \"pmids\": [\"20067321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NEIL1 physically interacts with PARP-1: PARP-1 binds the C-terminal ~100 aa of NEIL1 and NEIL1 binds the BRCT domain of PARP-1; NEIL1 stimulates poly(ADP-ribosyl)ation activity of PARP-1 in vitro; PARP-1 inhibits NEIL1 incision activity in a concentration-dependent manner; NEIL1-deficient fibroblasts have impaired PAR formation after DNA damage, rescued by NEIL1 re-expression.\",\n      \"method\": \"In vitro binding assay; Co-immunoprecipitation; in vitro PAR activity assay; domain-mapping; cell-based rescue experiment\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vitro functional assays, cell-based rescue; single lab, multiple methods\",\n      \"pmids\": [\"23104860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"hnRNP-U directly interacts with NEIL1 via the C-terminal interaction domain (KD ~54 nM); hnRNP-U stimulates NEIL1 base excision activity on multiple DNA substrates by enhancing product release; depletion of hnRNP-U and NEIL1 epistatically sensitizes cells to low oxidative damage.\",\n      \"method\": \"Co-immunoprecipitation; in vitro binding (Kd); in vitro stimulation assay; siRNA epistasis; cell survival assay; CD spectroscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, quantitative binding, in vitro stimulation, epistatic knockdown with defined phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"22902625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Neil1 acts as a genetic modifier of CAG trinucleotide repeat (TNR) expansion; Neil1-/- mice show significantly reduced somatic and germline TNR expansions in R6/1 Huntington's disease model mice; purified NEIL1 binds and excises 5-hydroxycytosine from duplex DNA more efficiently than from hairpin substrates, suggesting NEIL1-initiated BER can trigger repeat expansion.\",\n      \"method\": \"Neil1-/- knockout mouse genetics; repeat expansion assay (mean repeat change, instability index); in vitro glycosylase activity on hairpin vs duplex substrates\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic modifier experiment in vivo plus in vitro biochemical confirmation; multiple orthogonal approaches\",\n      \"pmids\": [\"22914735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NEIL1 excises oxidized guanine lesions Gh and Sp from quadruplex DNA with enhanced glycosylase activity on Gh in the telomeric sequence context; NEIL3 (not NEIL1) has activity on Tg in quadruplex DNA.\",\n      \"method\": \"In vitro DNA glycosylase assay on quadruplex DNA substrates containing defined lesions; comparison of five mammalian glycosylases\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with multiple enzymes and defined substrates, single lab\",\n      \"pmids\": [\"23926102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NEIL1 biochemical mapping revealed that Pro2 and Lys54 are both involved in AP lyase activity (Schiff-base formation); residues Met81, Arg119, and Phe120 are essential for 8-oxoG removal; arginine and histidine residues in the zincless finger loop are required for lesion processing; the disordered C-terminal region harbors the interaction interface for partner proteins.\",\n      \"method\": \"Site-directed mutagenesis; in vitro DNA glycosylase/AP lyase assays; single-turnover kinetics; Schiff-base trapping\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis with quantitative kinetics and trapping experiments, rigorous active-site characterization\",\n      \"pmids\": [\"22858590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NEIL1 is present in the DNA replication complex from human cells; NEIL1 associates with replication foci during S-phase and co-localizes with RPA-coated ssDNA template, inhibiting DNA polymerase delta synthesis upon encountering an oxidized base; NEIL1 deficiency slows nascent chain growth under oxidative stress; NEIL1 interacts with replication proteins RFC, pol delta, and DNA ligase I via its C-terminal domain.\",\n      \"method\": \"Gel filtration of nuclear extracts; co-immunoprecipitation; co-localization with BrdU/RPA foci; iPOND-like nascent chain analysis; in vitro primer extension inhibition; siRNA knockdown + BrdU incorporation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, co-localization, in vitro inhibition, cell-based functional readout) in a rigorous single-lab study\",\n      \"pmids\": [\"23898192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The disordered C-terminal domain (CTD) of NEIL1 interacts intramolecularly with the folded domain, stabilizing the native protein structure; a Lys-rich cluster (residues 355–360) contributes to this electrostatic stabilization; SAXS confirms CTD flexibility; deletion of CTD reduces protein stability.\",\n      \"method\": \"Intrinsic fluorescence spectroscopy; SAXS; circular dichroism; stability assays with osmolytes; mutagenesis of Lys cluster\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SAXS + spectroscopy + mutagenesis, single lab, multiple biophysical methods\",\n      \"pmids\": [\"23542007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The C-terminal domain (CTD) of NEIL1 is required for BERosome complex formation with replication proteins (RFC, pol delta, DNA ligase I); NEIL1 lacking the CTD does not associate with chromatin or replication foci during S phase; CTD polypeptide acts as a dominant-negative inhibitor in vitro and sensitizes cells to ROS when ectopically expressed; RFC stimulates NEIL1 activity ~8-fold.\",\n      \"method\": \"Co-immunoprecipitation; chromatin fractionation; replication foci co-localization; in vitro BER reconstitution; dominant-negative expression; cell survival after ROS\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, chromatin fractionation, co-localization, in vitro reconstitution, dominant-negative cell biology); single rigorous study\",\n      \"pmids\": [\"26134572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NEIL1 is polyubiquitylated by two E3 ubiquitin ligases, Mule and TRIM26, at C-terminal lysine residues; knockdown of either ligase stabilizes NEIL1 protein; ionizing radiation induces NEIL1 protein specifically in a Mule-dependent manner; stabilization of NEIL1 via TRIM26 knockdown increases cellular resistance to ionising radiation.\",\n      \"method\": \"Purification of E3 ligases from human cells; in vitro ubiquitylation assay; siRNA knockdown; protein stability assay; clonogenic survival after IR\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro ubiquitylation reconstitution, siRNA-based protein stability, cell-based phenotypic readout, two independent E3 ligases identified\",\n      \"pmids\": [\"27924031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEIL1 efficiently recognizes and excises the AFB1-Fapy-dG adduct from DNA in vitro; Neil1-/- mice show increased AFB1-Fapy-dG levels in liver DNA and are highly susceptible to AFB1-induced hepatocellular carcinoma (greater than XPA-/- mice deficient in NER).\",\n      \"method\": \"In vitro DNA glycosylase assay; AFB1-Fapy-dG quantification by mass spectrometry in neil1-/- mouse livers; carcinogenesis bioassay (tumor frequency and size) in neil1-/- vs WT vs xpa-/- mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution, in vivo lesion accumulation, in vivo carcinogenesis bioassay with multiple genotypes; orthogonal methods\",\n      \"pmids\": [\"28373545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEIL1 directly excises 5-carboxylcytosine (5caC) from dsDNA substrates; NEIL1 also stimulates TDG glycosylase activity on 5-formylcytosine (5fC) and 5caC substrates; NEIL1 provides AP lyase activity downstream of TDG glycosylase activity. Catalytically impaired NEIL1 P2T and E3Q mutants were used as controls.\",\n      \"method\": \"In vitro glycosylase assay with purified NEIL1 and catalytic mutants; in vitro reconstitution with TDG; substrate-specific activity assays on modified cytosine-containing dsDNA\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assays with active-site controls, single lab\",\n      \"pmids\": [\"28827588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human NEIL3 (and NEIL1) cleave psoralen-induced interstrand crosslinks in four-stranded DNA structures; NEIL1 cleaves to generate two unhooked duplexes with a nick, whereas NEIL3 targets both DNA strands without generating single-strand breaks.\",\n      \"method\": \"In vitro DNA glycosylase assay on three-stranded and four-stranded psoralen-crosslinked substrates; product characterization\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with defined substrates, single lab, novel substrate characterization\",\n      \"pmids\": [\"29234069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NEIL1 destabilizes the PCNA homotrimer upon interaction; SEC, native gel electrophoresis, mass spectrometry, AFM, and SAXS together demonstrate formation of a 1:1:1 NEIL1-DNA-PCNA(monomer) complex, suggesting a mechanistic switch between replication and BER.\",\n      \"method\": \"Size exclusion chromatography; native gel electrophoresis; mass spectrometry; atomic force microscopy; SAXS; ab initio shape reconstruction\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal biophysical methods (SEC, MS, AFM, SAXS) all supporting same conclusion in one rigorous study\",\n      \"pmids\": [\"27994037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NEIL1 is acetylated by histone acetyltransferase p300 predominantly at Lys 296, 297, and 298 in its C-terminal domain; acetylation is required for nuclear localization and chromatin association (non-acetylable 3KA mutant loses nuclear localization); acetylated NEIL1 is exclusively chromatin-bound; acetylation enhances glycosylase activity via increased product release; acetylation-defective cells show reduced BER complex formation and greater sensitivity to oxidative stress.\",\n      \"method\": \"In vitro acetylation assay; site-directed mutagenesis; subcellular fractionation; immunofluorescence; in vitro glycosylase activity; BER complex activity; cell survival assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — identified writer (p300), mapped modification sites, multiple functional consequences validated by mutagenesis and cell-based assays; multiple orthogonal methods\",\n      \"pmids\": [\"29698889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NEIL1 is present in purified mitochondrial extracts; NEIL1 interacts with mitochondrial single-stranded DNA binding protein (mtSSB) via its C-terminal tail; in absence of DNA, NEIL1 disrupts the mtSSB homotetramer forming a smaller NEIL1-mtSSB monomer complex; in presence of DNA, a larger ternary complex forms.\",\n      \"method\": \"Mitochondrial fractionation; protein painting; far-western analysis; gel-filtration chromatography; MALS; SAXS\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biophysical methods confirming interaction and stoichiometry, detected NEIL1 in mitochondrial extracts; single lab\",\n      \"pmids\": [\"29522991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"JNK1 kinase interacts with NEIL1 in vitro and in immunoprecipitates, and phosphorylates NEIL1 at Ser207, Ser306, and Ser61; phosphomimetic mutation of Y263 yields a completely inactive enzyme; phosphorylation at S207, S306, and S61 does not affect DNA binding or enzyme activity.\",\n      \"method\": \"Mass spectrometry identification of phosphorylation sites; co-immunoprecipitation; in vitro kinase assay; mutagenesis plus activity assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase identified in Co-IP and in vitro, phosphosites mapped by MS, functional mutagenesis; single lab, multiple methods\",\n      \"pmids\": [\"27518429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEIL1 and NEIL2 protect mitochondrial DNA from oxidative damage during neural crest development; Neil-deficiency in Xenopus embryos and mouse ESCs causes a TP53-dependent DNA damage response and intrinsic apoptosis specifically in cranial neural crest cells; epistasis experiments rule out involvement of epigenetic DNA demethylation.\",\n      \"method\": \"Xenopus morpholino knockdown; mouse ESC differentiation; Neil1/2 knockout; TP53 epistasis; mitochondrial DNA damage measurement; apoptosis assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in two model systems, mechanistic dissection separating repair from demethylation roles, multiple orthogonal methods\",\n      \"pmids\": [\"31566562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEIL1 preferentially excises oxidized bases from double-stranded DNA including damage upstream of a replication fork, whereas NEIL3 preferentially excises from ssDNA and open fork structures; the two glycosylases act in concert at the replication fork.\",\n      \"method\": \"In vitro glycosylase assay on model replication fork substrates with site-specific lesions at defined positions relative to the fork\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with defined model substrates, comparative analysis of NEIL1 and NEIL3, single lab\",\n      \"pmids\": [\"31018584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEIL1 kinetics on AFB1-Fapy-dG and NM-Fapy-dG adducts: unedited NEIL1 (K242) has ~1.4-fold higher rate than edited K242R on AFB1-Fapy-dG; the differential is large for ThyGly excision (7.5–12-fold) and 5-OHC (~3–5-fold); both forms preferentially release FapyAde and FapyGua from gamma-irradiated DNA.\",\n      \"method\": \"In vitro glycosylase assay; GC-MS/MS quantification of released lesions; molecular modeling\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic kinetics with MS quantification, systematic substrate comparison; single lab\",\n      \"pmids\": [\"31733589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NEIL1 interacts with mitochondrial transcription factor A (TFAM) via both its N- and C-terminal domains; the interaction is transient and enhanced by the presence of DNA; NEIL1 disrupts TFAM-DNA complex interactions; TFAM-transcribed mitochondrial gene expression is reduced in the absence of NEIL1 under DNA damage conditions.\",\n      \"method\": \"Biochemical co-precipitation; hydrogen-deuterium exchange mass spectrometry; MALS; gel filtration; mRNA expression analysis in NEIL1-deficient cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — HDX-MS, MALS, gel filtration, cell-based functional readout; single lab, multiple methods\",\n      \"pmids\": [\"35938152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Neil1-/- mice challenged with AFB1 show significantly increased mutation frequencies in nuclear (but not mitochondrial) liver genomes; mutation spectra in neil1-/- mice match AFB1-specific COSMIC signature SBS24, confirming NEIL1 limits AFB1-induced mutagenesis and carcinogenesis in vivo.\",\n      \"method\": \"Neil1-/- knockout mice; AFB1 challenge; duplex sequencing of liver DNA; tumor bioassay\",\n      \"journal\": \"NAR molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — duplex sequencing provides high-resolution mutagenesis data in vivo in knockout mice, corroborated by carcinogenesis assay; replicates prior findings with higher resolution method\",\n      \"pmids\": [\"38779538\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NEIL1 is a bifunctional DNA glycosylase/AP lyase that excises a broad spectrum of oxidized base lesions (formamidopyrimidines, thymine glycol, 5-hydroxyuracil, hydantoin lesions, and bulky adducts such as AFB1-FapyGua) from duplex, single-stranded, bubble, and fork-structured DNA via beta,delta-elimination, initiating base excision repair; it is activated during S phase, interacts via its disordered C-terminal domain with a network of replication (PCNA, RFC, pol delta, FEN-1, RPA, ligase I) and repair (WRN, CSB, 9-1-1 complex, hnRNP-U, PARP-1) proteins to form a BERosome that enables pre-replicative repair of oxidized bases ahead of the replication fork; its activity and nuclear localization are regulated by post-translational modifications including acetylation by p300 (required for chromatin association) and ubiquitylation by Mule/TRIM26 (controlling steady-state levels), and its substrate specificity is tuned by ADAR1-mediated RNA editing at codon 242 (Lys→Arg); in mitochondria, NEIL1 also interacts with mtSSB and TFAM to maintain mitochondrial genome integrity, and its absence in mice leads to metabolic syndrome, increased cancer susceptibility, and neurological deficits.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NEIL1 is a bifunctional DNA glycosylase/AP lyase that initiates base excision repair by excising a broad spectrum of oxidatively damaged bases — including thymine glycol, FapyA/FapyG formamidopyrimidines, 5-hydroxyuracil, dihydrouracil, and the further-oxidized hydantoin lesions guanidinohydantoin and spiroiminodihydantoin — via beta,delta-elimination, with cellular loss conferring sensitivity to oxidative and ionizing-radiation damage [#0, #3, #5]. Unlike NTH1 and OGG1, it efficiently processes lesions in single-stranded, bubble, and fork-structured DNA as well as duplex, quadruplex, and three-/four-stranded crosslinked substrates, extending its repertoire to psoralen interstrand crosslink unhooking and to 8,5'-cyclopurine and AFB1-Fapy-dG adducts [#1, #13, #18, #28, #30]. Its catalytic mechanism depends on an N-terminal Pro2/Lys54 nucleophile and a 'zincless finger' motif in which a conserved arginine, rather than coordinated zinc, is required for activity [#2, #23]. NEIL1 functions as a replication-coupled repair factor: it is recruited to S-phase replication foci and assembles a 'BERosome' through its intrinsically disordered C-terminal domain, which mediates interactions with replication and repair proteins including PCNA, RFC, pol delta, FEN-1, RPA, DNA ligase I, WRN, CSB, the 9-1-1 clamp, hnRNP-U, and PARP-1, most of which reciprocally stimulate its glycosylase activity to enable pre-replicative repair of oxidized bases ahead of the fork [#8, #9, #10, #11, #16, #20, #24, #26]. NEIL1 activity, abundance, and localization are tuned by post-translational and RNA-level controls: p300 acetylation of C-terminal lysines drives chromatin association and enhances activity [#32], Mule- and TRIM26-mediated polyubiquitylation governs steady-state protein levels and radiation resistance [#27], and ADAR1 RNA editing at codon 242 (Lys→Arg) reshapes substrate specificity [#15]. NEIL1 additionally localizes to mitochondria, where it interacts with mtSSB and TFAM to support mitochondrial genome integrity and gene expression [#33, #38]. In vivo, Neil1 deficiency increases endogenous lesion burden, raises mutation frequency, modifies trinucleotide repeat instability, and confers strong susceptibility to AFB1-induced hepatocellular carcinoma with a characteristic mutational signature [#12, #21, #28, #39].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established NEIL1 as a functional DNA repair enzyme by defining it as a bifunctional glycosylase/AP lyase that excises oxidized bases and protects cells from oxidative DNA damage.\",\n      \"evidence\": \"In vitro glycosylase assays on a substrate panel plus RNAi knockdown with gamma-irradiation survival in embryonic stem cells\",\n      \"pmids\": [\"12713815\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve preference among substrate classes\", \"Cellular pathway context and partners unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Distinguished NEIL1 from other glycosylases by showing it preferentially acts on non-duplex DNA (bubble and ssDNA), hinting at a replication/transcription-coupled role.\",\n      \"evidence\": \"Comparative in vitro glycosylase and binding assays across duplex, bubble, and ssDNA substrates\",\n      \"pmids\": [\"14522990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the in vivo source of such structures\", \"No partner proteins linking NEIL1 to replication forks yet\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the structural basis of catalysis by identifying a 'zincless finger' motif required for activity, explaining how NEIL1 engages lesions without a canonical zinc finger.\",\n      \"evidence\": \"X-ray crystallography of human NEIL1 with active-site mutagenesis and activity assays\",\n      \"pmids\": [\"15232006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No lesion-bound or full-length structure including the disordered C-terminus\", \"Mechanism of broad substrate recognition not fully resolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended the catalogue of physiological substrates and showed NEIL1 can functionally relieve OGG1 product inhibition, positioning it within the broader BER network.\",\n      \"evidence\": \"In vitro assays on gamma-irradiated DNA with GC-MS quantification and OGG1 turnover/displacement assays\",\n      \"pmids\": [\"15595846\", \"15350146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"OGG1 cooperation shown without stable physical interaction (Medium)\", \"Physiological significance of OGG1 displacement untested in cells\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Broadened NEIL1's lesion spectrum to hyperoxidized guanine products and lesions near strand breaks, defining substrates other glycosylases cannot process.\",\n      \"evidence\": \"In vitro glycosylase and trapping assays on Gh/Sp and 3'-proximal-lesion oligonucleotides\",\n      \"pmids\": [\"15533836\", \"16129732\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"3'-proximal-lesion processing replicated in only one lab (Medium)\", \"In vivo relevance of hydantoin repair not established here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified the transcriptional control of NEIL1, showing oxidative stress induces it via CRE/AP-1 promoter elements binding c-Jun and CREB/ATF2.\",\n      \"evidence\": \"Luciferase reporters, transcription start mapping, EMSA, and phospho-c-Jun immunoblot in human cells\",\n      \"pmids\": [\"16118226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab promoter analysis\", \"Whether induction measurably alters repair capacity not shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected NEIL1 mechanistically to DNA replication by demonstrating direct, activity-stimulating interactions with PCNA, WRN, and the 9-1-1 clamp through its C-terminal domain.\",\n      \"evidence\": \"Reciprocal Co-IP, quantitative binding, in vitro stimulation, co-localization, domain mapping, and siRNA epistasis\",\n      \"pmids\": [\"18032376\", \"17611195\", \"17395641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"C-terminal interaction interface lacks a canonical PIP box, recruitment mechanism unresolved\", \"Spatiotemporal ordering of these interactions at the fork unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked NEIL1 to long-patch BER via FEN-1 and demonstrated its endogenous anti-mutator role at oxidized A:T sites.\",\n      \"evidence\": \"Co-IP, quantitative binding, LP-BER reconstitution, and Hprt mutation-frequency assay under oxidative stress\",\n      \"pmids\": [\"18662981\", \"18495559\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hprt mutation study used antisense knockdown in a single lab (Medium)\", \"Relative contribution of short- vs long-patch BER in cells unquantified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Expanded NEIL1's pathway roles into interstrand crosslink repair and showed CSB-stimulated FapyGua repair, embedding NEIL1 in transcription-coupled and crosslink repair.\",\n      \"evidence\": \"In vitro BER reconstitution on crosslinked substrates; Co-IP, stimulation, double-knockdown epistasis, and knockout-mouse lesion quantification for CSB\",\n      \"pmids\": [\"19258314\", \"19179336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo coupling of NEIL1 to XPF/ERCC1 ICL repair not directly tested\", \"How CSB recruits NEIL1 to chromatin unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed multilayered regulation of NEIL1 at the fork and at the RNA level — RPA inhibition relieved by PCNA, and ADAR1 RNA editing reprogramming substrate specificity.\",\n      \"evidence\": \"Co-IP, quantitative binding, modulation assays for RPA; in vitro kinetics of edited vs unedited NEIL1 with ADAR1 identification by siRNA\",\n      \"pmids\": [\"20338831\", \"21068368\", \"20214901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"8-oxoAde abortive-repair finding is Medium-confidence single-lab\", \"Physiological fraction of edited NEIL1 in tissues not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Implicated NEIL1 in a BER-independent NER-like pathway for cyclopurine lesions, broadening its repair repertoire.\",\n      \"evidence\": \"Lesion accumulation (R/S-cdA) in Neil1-/- but not Ogg1-/- mouse liver by GC-MS/MS\",\n      \"pmids\": [\"20067321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism inferred from accumulation, not enzymatic reconstitution\", \"Direct NEIL1 role in NER not demonstrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined further partner interactions (PARP-1, hnRNP-U) and a disease-modifier role, with systematic mapping of catalytic residues.\",\n      \"evidence\": \"Co-IP, binding, stimulation, epistasis for PARP-1/hnRNP-U; Neil1-/- HD-model repeat-expansion genetics; site-directed mutagenesis with single-turnover kinetics\",\n      \"pmids\": [\"23104860\", \"22902625\", \"22914735\", \"22858590\", \"23926102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PARP-1 interaction is Medium-confidence single-lab\", \"How NEIL1-initiated BER mechanistically drives repeat expansion in vivo not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established NEIL1 as a replication-fork-resident repair factor that performs pre-replicative repair, interacting with the replication machinery via its C-terminus.\",\n      \"evidence\": \"Gel filtration, Co-IP with RFC/pol delta/ligase I, co-localization with RPA/BrdU foci, in vitro primer-extension inhibition, and nascent-chain analysis\",\n      \"pmids\": [\"23898192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fork-coupled repair is the dominant cellular pathway not quantified\", \"Trigger for NEIL1 fork recruitment unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Characterized the disordered C-terminal domain as an intramolecular stabilizer, providing biophysical basis for its dual structural and interaction-hub roles.\",\n      \"evidence\": \"Intrinsic fluorescence, SAXS, CD, osmolyte stability assays, and Lys-cluster mutagenesis\",\n      \"pmids\": [\"23542007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab biophysical study\", \"Link between CTD-mediated stability and in-cell function not directly shown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated the C-terminal domain is essential for assembling the replication-coupled 'BERosome' and chromatin/foci association, with a CTD fragment acting as dominant-negative.\",\n      \"evidence\": \"Co-IP, chromatin fractionation, foci co-localization, in vitro BER reconstitution, and dominant-negative ROS-sensitivity in cells\",\n      \"pmids\": [\"26134572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the assembled BERosome unresolved\", \"Order of partner assembly during S phase unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified JNK1 phosphorylation of NEIL1 and a phosphomimetic Y263 inactivating site, adding a kinase-signaling layer to NEIL1 regulation.\",\n      \"evidence\": \"MS phosphosite mapping, Co-IP, in vitro kinase assay, and mutagenesis activity assays\",\n      \"pmids\": [\"27518429\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of S61/S207/S306 phosphorylation unclear (no effect on activity)\", \"Y263 modification status in cells not demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined ubiquitin-dependent control of NEIL1 abundance, linking its turnover to radiation resistance.\",\n      \"evidence\": \"In vitro ubiquitylation, siRNA stability assays for Mule and TRIM26, and clonogenic survival after IR\",\n      \"pmids\": [\"27924031\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals triggering ligase selection between Mule and TRIM26 unknown\", \"Deubiquitylase counterpart not identified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mechanistically tied NEIL1 to the replication-to-repair switch and to epigenetic demethylation, and expanded crosslink and adduct substrates.\",\n      \"evidence\": \"Biophysical demonstration of NEIL1-driven PCNA trimer destabilization (SEC/MS/AFM/SAXS); in vitro assays on 5caC/TDG, AFB1-Fapy-dG, and four-stranded ICLs; Neil1-/- mouse carcinogenesis bioassay\",\n      \"pmids\": [\"27994037\", \"28827588\", \"28373545\", \"29234069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"5caC/TDG cooperation and four-stranded ICL processing are Medium-confidence single-lab\", \"In vivo significance of PCNA monomerization not directly tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established acetylation as a master regulator coupling NEIL1 localization to function and demonstrated mitochondrial localization with mtSSB interaction.\",\n      \"evidence\": \"In vitro p300 acetylation, site mutagenesis, fractionation/IF, and activity/survival assays; mitochondrial fractionation with protein-painting, far-western, MALS, and SAXS for mtSSB\",\n      \"pmids\": [\"29698889\", \"29522991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mtSSB interaction is Medium-confidence single-lab\", \"Deacetylase and dynamic regulation of acetylation in vivo not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a developmental and mitochondrial-protective role and refined the division of labor between NEIL1 and NEIL3 at replication forks.\",\n      \"evidence\": \"Xenopus/mouse ESC Neil knockout with TP53 epistasis and mtDNA damage assays; comparative in vitro fork-substrate glycosylase assays and AFB1/NM-Fapy-dG kinetics\",\n      \"pmids\": [\"31566562\", \"31018584\", \"31733589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Fork division-of-labor and edited-NEIL1 kinetics are Medium-confidence in vitro models\", \"How mtDNA repair couples to neural crest survival mechanistically not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked NEIL1 to mitochondrial transcription by showing it interacts with TFAM and modulates TFAM-DNA complexes and mitochondrial gene expression under damage.\",\n      \"evidence\": \"Co-precipitation, HDX-MS, MALS, gel filtration, and mRNA expression in NEIL1-deficient cells\",\n      \"pmids\": [\"35938152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab, transient interaction\", \"Whether the effect reflects repair or a direct transcriptional role is unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Provided high-resolution in vivo confirmation that NEIL1 suppresses AFB1-induced nuclear mutagenesis matching a defined COSMIC signature.\",\n      \"evidence\": \"Duplex sequencing of Neil1-/- mouse liver after AFB1 with tumor bioassay\",\n      \"pmids\": [\"38779538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why mitochondrial genome was not similarly affected unexplained\", \"Human relevance of the mouse mutational signature not directly tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the BERosome is spatiotemporally assembled and how the multiple regulatory layers (acetylation, ubiquitylation, phosphorylation, RNA editing) are integrated to direct NEIL1 between nuclear replication-coupled repair and mitochondrial maintenance remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated structure of the assembled NEIL1 BERosome\", \"Hierarchy and crosstalk among PTMs not established\", \"Determinants of nuclear vs mitochondrial partitioning unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [0, 1, 3, 5, 13, 23, 28, 29]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 2, 23]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 5, 16, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 19, 29, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [24, 26, 32]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [26, 32]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [33, 35, 38]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 11, 13, 26]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [8, 16, 24, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [28, 39]}\n    ],\n    \"complexes\": [\"BERosome (NEIL1-replication/repair protein complex)\", \"9-1-1 (Rad9-Rad1-Hus1) clamp-associated\"],\n    \"partners\": [\"PCNA\", \"FEN1\", \"WRN\", \"CSB\", \"RPA\", \"HNRNPU\", \"PARP1\", \"TFAM\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}