{"gene":"DCLRE1C","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2002,"finding":"Artemis forms a stable complex with DNA-PKcs in the absence of DNA. Purified Artemis alone possesses 5' to 3' single-strand-specific exonuclease activity. Upon complex formation, DNA-PKcs phosphorylates Artemis, and Artemis acquires endonucleolytic activity on 5' and 3' overhangs as well as hairpins. The Artemis:DNA-PKcs complex can open hairpins generated by the RAG complex.","method":"In vitro reconstitution, purified protein biochemical assays, endonuclease/exonuclease activity assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified components, multiple orthogonal activity assays, foundational mechanistic paper replicated by many subsequent studies","pmids":["11955432"],"is_preprint":false},{"year":2001,"finding":"Artemis is a novel protein whose mutations cause human RS-SCID. Protein sequence analysis identifies Artemis as a member of the metallo-beta-lactamase superfamily, involved in V(D)J recombination and DNA double-strand break repair.","method":"Positional cloning, protein sequence analysis, genetic mutation identification in patients","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — gene identified by positional cloning with patient mutations, replicated across multiple subsequent studies","pmids":["11336668"],"is_preprint":false},{"year":2004,"finding":"ATM and Artemis function in a common DSB repair pathway (epistasis analysis). Radiation-induced Artemis hyperphosphorylation is ATM-dependent. The DSB repair process requires Artemis nuclease activity and rejoins approximately 10% of radiation-induced DSBs. Artemis is a downstream component of the ATM signaling pathway required for DSB repair but dispensable for ATM-dependent cell cycle checkpoint arrest.","method":"Epistasis analysis, irradiation survival assays, phosphorylation analysis, nuclease-dead mutants","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple NHEJ/DSB repair factors, replicated across labs","pmids":["15574327"],"is_preprint":false},{"year":2006,"finding":"DNA-PKcs autophosphorylation at the T2609-T2647 cluster (in the presence of Ku and target DNA) is required for Artemis-mediated endonuclease activity. Autophosphorylated DNA-PKcs stably associates with Ku-bound DNA with large single-stranded overhangs until overhang cleavage by Artemis. Artemis phosphorylation per se (at S503, S516, S645) is dispensable for endonuclease activity in vitro and for DSB repair and V(D)J recombination in vivo.","method":"In vitro endonuclease assays with autophosphorylation mutants of DNA-PKcs, cell-based V(D)J recombination assays, phospho-specific antibodies","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis of DNA-PKcs autophosphorylation sites, combined with in vivo V(D)J recombination assay","pmids":["16874298"],"is_preprint":false},{"year":2004,"finding":"Active-site mutagenesis of eight conserved histidine and aspartate residues within the metallo-beta-lactamase domain of Artemis abolishes both hairpin-opening and overhang endonucleolytic activities but does not impair 5' to 3' exonuclease activity, indicating that hairpin-opening/endonuclease activity is necessary for V(D)J recombination while exonuclease activity is not sufficient.","method":"Site-directed mutagenesis of catalytic residues, in vitro biochemical nuclease assays, in vivo V(D)J recombination assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — active-site mutagenesis combined with in vitro activity assays and in vivo recombination assay in single rigorous study","pmids":["15071507"],"is_preprint":false},{"year":2005,"finding":"All DNA-PKcs phosphorylation sites on Artemis (11 sites) and three basal phosphorylation sites are located in the C-terminal domain. Phosphatase-treated Artemis and Artemis mutated at basal phosphorylation sites retain DNA-PKcs-dependent endonucleolytic activities. The C-terminal domain may have a negative regulatory effect on Artemis endonucleolytic activities, and phosphorylation by DNA-PKcs in the C-terminal domain may relieve this inhibition.","method":"Mass spectrometry phosphosite mapping, in vitro kinase assays, endonuclease activity assays with phosphorylation mutants","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS-based phosphosite identification combined with biochemical activity assays, single lab but multiple orthogonal methods","pmids":["16093244"],"is_preprint":false},{"year":2006,"finding":"The Artemis:DNA-PKcs complex cleaves DNA loops, flaps, and gaps — all substrates containing single-to-double-strand transitions — near the transition region. This versatile structure-specific endonuclease activity depends on complex formation and is important for NHEJ of incompatible DNA ends.","method":"In vitro endonuclease assays with defined DNA substrates (heterologous loops, stem-loops, flaps, gapped substrates)","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple defined substrate structures, single lab","pmids":["15936993"],"is_preprint":false},{"year":2006,"finding":"A region of the Artemis C-terminal tail mediates interaction with DNA-PKcs. C-terminally truncated Artemis variants exhibit intrinsic hairpin-opening activity without DNA-PKcs activation, indicating that autoinhibition by the C-terminal tail is relieved by DNA-PKcs phosphorylation. DNA-PKcs may also optimally configure 5' and 3' overhang substrates for Artemis endonucleolytic function.","method":"C-terminal truncation mutant analysis, in vitro nuclease assays, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — biochemical dissection with truncation mutants and in vitro activity assays, single lab, multiple orthogonal methods","pmids":["16914548"],"is_preprint":false},{"year":2009,"finding":"In G2 phase, Artemis (requiring its endonuclease activity) and ATM are required for homologous recombination repair of approximately 15% of radiation-induced DSBs, promoting single-stranded DNA and Rad51 foci formation. ATM and Artemis promote NHEJ in G1 but HR in G2, and this HR in G2 repairs heterochromatin-associated DSBs (dependency relieved by KAP-1 depletion).","method":"Epistasis analysis with siRNA knockdown of Artemis, Brca2, Rad51, Rad54; gamma-H2AX and Rad51 foci analysis; nuclease-dead Artemis mutant","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis analysis with multiple repair factors, nuclease-dead mutant, replicated findings from multiple labs","pmids":["19779458"],"is_preprint":false},{"year":2002,"finding":"Artemis-deficient mice display severe combined immunodeficiency with defects in opening and joining V(D)J coding hairpin ends and increased ionizing radiation sensitivity, phenocopying DNA-PKcs-deficient mice. Artemis deficiency leads to chromosomal instability in fibroblasts. Signal joint formation is intact while coding joint formation is impaired, consistent with a hairpin coding end opening defect.","method":"Artemis knockout mouse model, V(D)J recombination assays, radiation sensitivity assays, chromosomal stability analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with defined lymphoid and DNA repair phenotypes, replicated across multiple labs","pmids":["12504013"],"is_preprint":false},{"year":2002,"finding":"The SCIDA (Athabascan SCID) gene is identified as Artemis (SNM1-like). A founder nonsense mutation truncates the protein in 21 SCIDA patients. Wild-type Artemis complements defective coding joint and reduced signal joint formation in SCIDA fibroblasts. Artemis encodes a nuclear protein.","method":"Positional cloning, complementation assay in patient fibroblasts, subcellular localization by immunostaining","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — complementation assay establishing functional requirement, nuclear localization by direct experiment, replicated with original Artemis discovery","pmids":["12055248"],"is_preprint":false},{"year":2006,"finding":"Artemis is mobilized to damaged chromatin together with DNA-PK and XRCC4/ligase IV upon DSB induction. DNA-PKcs is necessary for loading of Artemis on damaged DNA. DNA-PKcs kinase activity maintains Artemis association with the DNA-PK:DNA complex, while Ku mediates assembly of DNA-PK on DNA ends and is responsible for dissociation of the DNA-PKcs:Artemis complex under kinase-preventive conditions.","method":"Cell fractionation/chromatin immunoprecipitation, co-immunoprecipitation in nuclear extracts, in vitro DNA-binding assays with kinase inhibitors","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and chromatin fractionation, single lab, two orthogonal methods","pmids":["16857680"],"is_preprint":false},{"year":2004,"finding":"Artemis is phosphorylated by ATM or ATR following ionizing radiation or UV irradiation, respectively. Artemis interacts with known cell cycle checkpoint proteins. Artemis is required for the maintenance of normal DNA damage-induced G2/M cell cycle arrest.","method":"Phosphorylation analysis after DNA damage, co-immunoprecipitation with checkpoint proteins, G2/M checkpoint assay in Artemis-depleted cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with checkpoint proteins and phosphorylation analysis with cell-cycle phenotype, single lab","pmids":["15456891"],"is_preprint":false},{"year":2007,"finding":"ATM phosphorylates Artemis at S516 and S645 in response to ionizing radiation. Mutation of S516 and S645 results in defective recovery from the G2/M checkpoint. Mutant Artemis promotes enhanced interaction between unphosphorylated cyclin B and Cdk1, causing inhibitory Wee1-mediated phosphorylation of Cdk1, and causes retention of Cdk1-cyclin B in the centrosome with inhibition of nuclear import during prophase.","method":"Site-directed mutagenesis, phospho-specific antibodies, co-immunoprecipitation, immunofluorescence localization of Cdk1-cyclin B, G2/M checkpoint recovery assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis with multiple downstream readouts, single lab, multiple orthogonal methods","pmids":["17242184"],"is_preprint":false},{"year":2014,"finding":"Artemis is a PTIP-binding protein (identified by co-immunoprecipitation). Loss of Artemis restores PARP-inhibitor resistance in BRCA1-deficient cells, placing Artemis as the major downstream effector of the 53BP1 pathway, which prevents end resection and promotes NHEJ in competition with homologous recombination.","method":"Co-immunoprecipitation, genetic epistasis (Artemis loss-of-function in BRCA1-deficient cells), cell survival assays with PARP inhibitors","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying new binding partner, genetic epistasis with functional phenotype, single lab","pmids":["25512557"],"is_preprint":false},{"year":2012,"finding":"The Artemis C-terminal region directly interacts with the DNA-binding domain of DNA Ligase IV. This interaction is specific and independent of DNA and DNA-PKcs. Point mutations in Artemis disrupting Ligase IV or DNA-PKcs interactions reduce V(D)J recombination coding joint formation, with additive effects when both interactions are disrupted. Signal joint formation is unaffected.","method":"Co-immunoprecipitation, pulldown assays, point mutagenesis, V(D)J recombination assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus mutagenesis with functional V(D)J recombination readout, single lab, multiple orthogonal methods","pmids":["22529269"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the DNA Ligase IV DNA-binding domain in complex with a peptide from the Artemis C-terminal region reveals that LigIV interacts with Artemis through an extended hydrophobic surface. Helix α2 in LigIV-DBD is longer than in other mammalian ligases and presents residues specifically interacting with Artemis. Mutations of key LigIV-DBD hydrophobic surface residues abolish the interaction.","method":"X-ray crystallography of LigIV-DBD apo and Artemis peptide complex, mutagenesis confirming interface","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validation of interaction interface","pmids":["23219551"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of the basal (pre-activated) state Artemis:DNA-PKcs complex show the Artemis catalytic domain dynamically positioned externally to DNA-PKcs prior to ABCDE autophosphorylation. Both catalytic and regulatory domains of Artemis interact with N-HEAT and FAT domains of DNA-PKcs. A mutually exclusive binding site exists for Artemis and XRCC4 on DNA-PKcs; an XRCC4 peptide disrupts the Artemis:DNA-PKcs complex.","method":"Cryo-EM structural analysis, agarose-acrylamide gel system for complex stabilization, XRCC4 peptide competition assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structure with functional competition experiments, single study","pmids":["35801871"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of the catalytic domain of wildtype and variant Artemis reveal a second metal binding site in the β-CASP domain unique to Artemis (absent in SNM1A/SNM1B), explaining predominantly endonucleolytic activity. The catalytic domain alone has similar endonuclease activity to phosphorylated full-length protein. An RS-SCID Omenn syndrome variant is structurally characterized. Ebselen can inhibit the second metal binding site.","method":"X-ray crystallography of Artemis catalytic domain (wildtype and variants), in vitro endonuclease activity assays, small molecule inhibitor testing","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with biochemical activity validation, inhibitor testing, single rigorous study","pmids":["34387696"],"is_preprint":false},{"year":2006,"finding":"Processing of 3'-phosphoglycolate-terminated DNA double-strand break termini by Artemis nuclease is completely dependent on DNA-dependent protein kinase and ATP, and is largely dependent on Ku. Artemis efficiently removes terminal nucleotides from phosphoglycolate-terminated 3' overhangs in a manner distinct from hydroxyl-terminated substrates. Human cells lacking Artemis are hypersensitive to bleomycin, neocarzinostatin, and X-rays, which all induce 3'-phosphoglycolate-terminated DSBs.","method":"In vitro Artemis nuclease assays with 3'-phosphoglycolate substrates, cell survival assays with DNA-damaging agents in Artemis-deficient cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with modified substrates plus cell-based phenotype, single lab","pmids":["17121861"],"is_preprint":false},{"year":2010,"finding":"Purified Artemis exhibits single-stranded DNA endonuclease activity that is stimulated by DNA-PKcs. The divalent cation dependence and sequence dependence of this single-stranded endonuclease activity parallels the double-stranded DNA endonuclease activity of Artemis:DNA-PKcs.","method":"In vitro endonuclease assays with purified Artemis and ssDNA substrates, modulation by antibodies and DNA-PKcs","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified protein, multiple substrate types, single lab","pmids":["20117966"],"is_preprint":false},{"year":2014,"finding":"The 5'-exonuclease and endonuclease activities of Artemis co-purify and share the same active site: the H115A point mutant markedly reduces both activities, divalent cation effects on both activities parallel one another, and small molecule inhibitors block both activities in parallel. The 5'-exonuclease is intrinsic to Artemis.","method":"Co-purification analysis, active-site mutagenesis (H115A), divalent cation dependence assays, small molecule inhibitor studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis with multiple orthogonal methods (mutagenesis, cation dependence, inhibitors) in single study","pmids":["24500713"],"is_preprint":false},{"year":2015,"finding":"Artemis resects iteratively into blunt DNA ends with efficiency reflecting AT-richness (DNA end breathing requirement). GC-rich blunt ends are not cut by Artemis alone. All blunt DNA ends are cut when DNA-PKcs and Ku accompany Artemis, but not when Ku is omitted — demonstrating Ku dependence of Artemis action on blunt DNA ends.","method":"In vitro nuclease assays with blunt and fixed pseudo-Y DNA structures, systematic variation of Ku presence/absence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with defined substrates, single lab","pmids":["26276388"],"is_preprint":false},{"year":2008,"finding":"The Ku80 carboxy terminus supports DNA-PKcs autophosphorylation at Thr2647 (but not Ser2056), which in turn is required for Artemis nuclease activity in vivo and in vitro. Cells with Ku80 C-terminal deletion show severely reduced Artemis endonuclease activity.","method":"Ku80 carboxy-terminal deletion cell lines, phospho-specific antibodies, in vitro and in vivo Artemis nuclease activity assays, IR sensitivity","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell lines with defined mutations, in vitro and in vivo nuclease activity assays, single lab","pmids":["19103741"],"is_preprint":false},{"year":2008,"finding":"A DNA-PKcs missense mutation (L3062R) in an RS-SCID patient does not affect kinase activity or DNA end-binding capacity per se, but causes insufficient Artemis activation dependent on interaction with autophosphorylated DNA-PKcs, resulting in long P-nucleotide stretches in immunoglobulin coding joints.","method":"Patient mutation identification, heterologous expression system functional assay, immunoglobulin junction analysis","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient mutation with functional complementation and molecular readout, single study","pmids":["19075392"],"is_preprint":false},{"year":2006,"finding":"Artemis phosphorylated by DNA-PKcs at S516 and S645 is concentrated in chromatin-associated nuclear foci in naïve cells. Phosphorylation at both sites in vivo shows dependence on DNA-PKcs association and is additionally stimulated by double-stranded DNA damage. The interface on Artemis required for DNA-PKcs association was delimited.","method":"Phospho-specific antibody immunofluorescence, chromatin fractionation, co-immunoprecipitation, V(D)J recombination assay with stable substrates","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phospho-specific antibodies with chromatin localization and co-IP, single lab","pmids":["16600297"],"is_preprint":false},{"year":2004,"finding":"Artemis is constitutively phosphorylated in cultured cells and undergoes additional IR-induced phosphorylation that is mainly but not solely ATM-dependent. In vitro-generated Artemis mutants with impaired IR-induced phosphorylation still display activity sufficient to complement V(D)J recombination defects and radiosensitivity of Artemis-deficient cells.","method":"Phosphorylation analysis, ATM-deficient cell lines, complementation assay in Artemis-deficient cells, V(D)J recombination assay","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — complementation with phosphorylation mutants in patient cells, single lab","pmids":["15468306"],"is_preprint":false},{"year":2005,"finding":"Artemis is hyperphosphorylated in an ATM- and Nbs1-dependent manner in response to ionizing radiation, with S645 being a contributing SQ/TQ site. Reintroduction of wild-type ATM or Nbs1 reconstituted Artemis hyperphosphorylation in deficient cells. Hyperphosphorylated Artemis physically associates with the Mre11/Rad50/Nbs1 complex in an ATM-dependent manner in response to IR-induced DSBs.","method":"Phosphorylation analysis in ATM/Nbs1 null cells, complementation with wild-type ATM/Nbs1, co-immunoprecipitation of Artemis with MRN complex","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with MRN complex, complementation in null cells, single lab","pmids":["15723659"],"is_preprint":false},{"year":2011,"finding":"Artemis interacts with the Cul4A-DDB1 E3 ubiquitin ligase via direct interaction with substrate-specificity receptor DDB2. Artemis also interacts with CDK inhibitor p27. Both DDB2 and Artemis are required for degradation of p27 mediated by this complex. Regulation of p27 by Artemis and DDB2 controls cell cycle progression in normally proliferating cells and in response to serum deprivation.","method":"Co-immunoprecipitation, siRNA knockdown of Artemis and DDB2, p27 degradation assays, cell cycle analysis","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP identifying two new binding partners with functional p27 degradation readout, single lab","pmids":["22134138"],"is_preprint":false},{"year":2009,"finding":"Artemis interacts with the F-box protein Fbw7. This interaction, regulated by ATR-mediated phosphorylation at Ser516 and Ser645 in response to replication stress, promotes ubiquitylation and degradation of cyclin E through the SCFFbw7 E3 ubiquitin ligase complex. Mutation of Ser516/Ser645 causes prolonged S phase checkpoint recovery coinciding with stabilization of cyclin E and downregulation of Cdk2 kinase activity.","method":"Co-immunoprecipitation (Artemis-Fbw7), cyclin E degradation assays, phospho-mutant analysis, cell cycle recovery assays after UV/aphidicolin/hydroxyurea","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with new binding partner, phospho-mutant functional analysis with multiple replication stress agents, single lab","pmids":["19423708"],"is_preprint":false},{"year":2009,"finding":"Artemis is a negative regulator of p53 in response to oxidative stress generated by mitochondrial respiration. Depletion of Artemis leads to spontaneous DNA-PKcs-dependent phosphorylation and stabilization of p53, resulting in G1 arrest and apoptosis. Co-depletion of DNA-PKcs (but not ATM) suppresses these effects.","method":"siRNA knockdown of Artemis and DNA-PKcs, p53 phosphorylation/stabilization assays, cell cycle analysis, antioxidant and mitochondrial inhibitor treatments","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via co-depletion with mechanistic specificity for DNA-PKcs vs ATM, multiple perturbation conditions, single lab","pmids":["19398950"],"is_preprint":false},{"year":2008,"finding":"DNA-PKcs and Artemis are required for joining a subset of AID-dependent DSBs during immunoglobulin class switch recombination. In the absence of either factor, B cells activated for CSR frequently generate AID-dependent IgH locus chromosomal breaks and translocations.","method":"IgH locus-specific FISH assay in DNA-PKcs-/- and Artemis-/- B cells activated for CSR, chromosomal break/translocation analysis","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout cells with locus-specific FISH, defined molecular phenotype, single lab","pmids":["18316419"],"is_preprint":false},{"year":2007,"finding":"DNA-PKcs and Artemis open AAV inverted terminal repeat (ITR) hairpin loops in a tissue-dependent manner in vivo. In the absence of either factor, ITR hairpin opening is impaired and double-stranded linear rAAV genomes with covalently closed hairpin termini accumulate. The 5' end of 3-base hairpin loops of the ITR is the primary target for DNA-PKcs- and Artemis-mediated cleavage.","method":"Recombinant AAV infection of DNA-PKcs- and Artemis-deficient mice, Southern blot analysis of rAAV genome metabolism in multiple tissues","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with defined molecular readout (hairpin opening), two tissue types, single lab","pmids":["17686847"],"is_preprint":false},{"year":2017,"finding":"XRCC4-DNA ligase IV (X4-LIV) stimulates Artemis nuclease activity on 3' overhangs in a DNA-PKcs-independent manner. X4-LIV cannot stimulate Artemis at hairpins or 5' overhangs. X4-LIV and DNA-PKcs interfere with each other with respect to stimulating Artemis at 3' overhangs, consistent with sequential rather than concurrent recruitment.","method":"In vitro nuclease assays and ligation assays with defined DNA substrate configurations, systematic variation of NHEJ protein components","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components and defined substrates, single lab","pmids":["28696258"],"is_preprint":false},{"year":2018,"finding":"Artemis endonuclease (along with XPF-ERCC1) cleaves stalled DNA replication forks during S and G2 phases in response to replication stress, through non-epistatic pathways. Both nucleases are recruited to chromatin to promote replication fork restart. Artemis- and XPF-mediated rapid replication fork breakage prevents mitotic segregation defects.","method":"siRNA knockdown of Artemis and XPF-ERCC1, chromatin fractionation, DNA fiber assays, mitotic segregation analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with chromatin recruitment and defined replication/mitosis phenotypes, single lab","pmids":["30059501"],"is_preprint":false},{"year":2008,"finding":"KU70, DNA-PKcs, and Artemis are essential for the rapid induction of apoptosis after massive DSB formation by high-dose etoposide. KU70 acts upstream of DNA-PKcs and Artemis acts downstream of DNA-PKcs in this apoptotic pathway. KU70 is required for chromatin binding of DNA-PKcs while Artemis is not required for DNA-PKcs chromatin binding, placing Artemis downstream of DNA-PKcs in apoptosis induction.","method":"Gene-targeted knockout DT40 cells, etoposide-induced apoptosis assay, caspase inhibitor studies, chromatin fractionation of DNA-PKcs in presence/absence of Artemis","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis analysis with clean knockouts, multiple downstream readouts, single lab","pmids":["18674614"],"is_preprint":false}],"current_model":"Artemis (DCLRE1C) is a metallo-β-lactamase/β-CASP domain endonuclease that forms a stable complex with DNA-PKcs; alone it has 5'-to-3' exonuclease activity on single-stranded DNA, but upon binding DNA-PKcs (which both phosphorylates Artemis and undergoes ABCDE-cluster autophosphorylation to relieve Artemis C-terminal autoinhibition), it acquires structure-specific endonuclease activity at hairpins, 5' and 3' overhangs, loops, flaps, and single-to-double-strand junctions — activities essential for opening RAG-generated coding hairpins during V(D)J recombination, processing a subset (~10%) of radiation-induced DSBs in heterochromatin in an ATM-dependent pathway, and promoting HR repair in G2; additionally, ATM/ATR-mediated phosphorylation of Artemis at S516/S645 regulates G2/M and S-phase checkpoint recovery through interactions with Cdk1-cyclin B and the SCF-Fbw7/cyclin E axis, the Artemis C-terminus interacts with DNA Ligase IV and DNA-PKcs to coordinate ligation during NHEJ, and Artemis also associates with PTIP (downstream of 53BP1) to suppress end resection and HR, with the Cul4A-DDB1-DDB2 E3 ligase to regulate p27 degradation and G1 progression, and with the MRN complex downstream of ATM."},"narrative":{"mechanistic_narrative":"DCLRE1C encodes Artemis, a nuclear metallo-β-lactamase/β-CASP-superfamily nuclease that is the principal structure-specific endonuclease of non-homologous end joining (NHEJ) and V(D)J recombination [PMID:11955432, PMID:11336668, PMID:12055248]. Purified Artemis intrinsically possesses 5'-to-3' single-stranded DNA exonuclease activity, but upon forming a stable, DNA-independent complex with DNA-PKcs it gains endonucleolytic activity at hairpins, 5' and 3' overhangs, loops, flaps, gaps, and other single-to-double-strand transitions [PMID:11955432, PMID:15936993]. Both the exo- and endonuclease activities share a single active site within the metallo-β-lactamase domain, where mutagenesis of conserved histidine/aspartate residues (including H115) abolishes endonuclease and hairpin-opening function; a second β-CASP metal site unique to Artemis explains its predominantly endonucleolytic behavior [PMID:15071507, PMID:34387696, PMID:24500713]. Activation is gated by DNA-PKcs autophosphorylation at the T2609–T2647 cluster, which relieves an autoinhibitory Artemis C-terminal tail rather than requiring direct Artemis phosphorylation; truncating this tail yields constitutive hairpin-opening activity, and Ku80 supports the relevant autophosphorylation [PMID:16874298, PMID:16093244, PMID:16914548, PMID:19103741]. Within NHEJ, the Artemis C-terminus directly binds the DNA Ligase IV DNA-binding domain through an extended hydrophobic interface to coordinate end processing with ligation, while Artemis and XRCC4 occupy mutually exclusive sites on DNA-PKcs, enforcing sequential recruitment during repair [PMID:22529269, PMID:23219551, PMID:35801871, PMID:28696258]. Loss of Artemis causes radiosensitive severe combined immunodeficiency (RS-SCID) through a failure to open RAG-generated coding hairpins, producing defective coding-joint formation while signal joints remain intact [PMID:11336668, PMID:12504013, PMID:12055248]. Beyond canonical end joining, Artemis acts downstream of ATM with the MRN complex to repair a slow-repairing, heterochromatin-associated subset of radiation-induced double-strand breaks and to promote homologous recombination in G2, and is regulated by ATM/ATR phosphorylation at S516/S645 governing G2/M and S-phase checkpoint recovery via Cdk1–cyclin B and SCF-Fbw7/cyclin E control [PMID:15574327, PMID:19779458, PMID:17242184, PMID:15723659, PMID:19423708].","teleology":[{"year":2001,"claim":"Establishing the gene's identity answered why a class of human SCID arose, linking an uncharacterized metallo-β-lactamase-family protein to V(D)J recombination and DSB repair.","evidence":"Positional cloning and sequence analysis of patient mutations causing RS-SCID","pmids":["11336668"],"confidence":"High","gaps":["Did not define the biochemical activity of the protein","No mechanism for how mutations impair recombination"]},{"year":2002,"claim":"Reconstitution with purified components answered what Artemis does enzymatically and how it is switched on, defining the DNA-PKcs-dependent acquisition of endonuclease and hairpin-opening activity.","evidence":"In vitro reconstitution with purified Artemis and DNA-PKcs, endo/exonuclease assays, RAG-hairpin opening","pmids":["11955432"],"confidence":"High","gaps":["Did not resolve which active site mediates each activity","Mechanism of DNA-PKcs activation of Artemis not defined"]},{"year":2002,"claim":"Knockout mice and patient complementation established the in vivo physiological requirement, showing Artemis loss specifically blocks coding-hairpin opening while sparing signal joints, and confers radiosensitivity and genomic instability.","evidence":"Artemis-null mice, V(D)J and radiation assays; complementation of SCIDA patient fibroblasts with nuclear localization","pmids":["12504013","12055248"],"confidence":"High","gaps":["Did not address Artemis roles outside lymphoid development","Subcellular dynamics during repair not defined"]},{"year":2004,"claim":"Active-site mutagenesis answered which catalytic function is required for recombination, separating dispensable exonuclease from essential endonuclease/hairpin-opening activity.","evidence":"Mutagenesis of eight conserved His/Asp residues with in vitro nuclease and in vivo V(D)J assays","pmids":["15071507"],"confidence":"High","gaps":["Did not determine whether exo and endo activities use one or two active sites","Structural basis unresolved"]},{"year":2004,"claim":"Epistasis analysis placed Artemis genetically downstream of ATM in repair of a defined minor DSB subset, distinguishing its repair role from checkpoint signaling.","evidence":"Epistasis, irradiation survival, ATM-dependent phosphorylation, nuclease-dead mutants","pmids":["15574327"],"confidence":"High","gaps":["Did not identify the chromatin context of the ~10% slow-repair fraction","Did not define the repair pathway used"]},{"year":2004,"claim":"DNA-damage phosphorylation studies connected Artemis to checkpoint machinery, showing ATM/ATR phosphorylation and a requirement for normal G2/M arrest.","evidence":"Phosphorylation after IR/UV, co-IP with checkpoint proteins, G2/M assays; complementation with phospho-mutants","pmids":["15456891","15468306"],"confidence":"Medium","gaps":["Phospho-mutants still complemented V(D)J/radiosensitivity, leaving checkpoint role functionally separable","Direct checkpoint effectors not identified"]},{"year":2005,"claim":"Phosphosite mapping clarified the regulatory logic, localizing DNA-PKcs phosphorylation to a C-terminal domain that exerts negative regulation relieved upon phosphorylation.","evidence":"Mass-spec phosphosite mapping, kinase and endonuclease assays with phospho-mutants","pmids":["16093244"],"confidence":"High","gaps":["Did not show direct structural autoinhibition","Did not exclude phosphorylation-independent activation"]},{"year":2005,"claim":"Showing ATM/Nbs1-dependent hyperphosphorylation and MRN association integrated Artemis into the ATM-MRN DSB-response axis.","evidence":"Phosphorylation in ATM/Nbs1-null cells, complementation, co-IP with MRN","pmids":["15723659"],"confidence":"Medium","gaps":["Functional consequence of MRN association not defined","Single-lab co-IP without structural detail"]},{"year":2006,"claim":"Mechanistic dissection of activation showed DNA-PKcs autophosphorylation (T2609-T2647 cluster), not Artemis phosphorylation per se, licenses endonuclease activity, and that C-terminal truncation relieves autoinhibition.","evidence":"DNA-PKcs autophosphorylation mutants, Artemis truncation mutants, in vitro nuclease, in vivo V(D)J","pmids":["16874298","16914548"],"confidence":"High","gaps":["Atomic basis of autoinhibition unresolved at the time","Did not define DNA-PKcs conformational changes driving activation"]},{"year":2006,"claim":"Substrate-range and recruitment studies broadened the role to a general structure-specific endonuclease that is loaded and retained on damaged chromatin by DNA-PKcs.","evidence":"In vitro assays on loops/flaps/gaps; chromatin fractionation and co-IP with DNA-PK and XRCC4/LigIV; phospho-foci localization","pmids":["15936993","16857680","16600297"],"confidence":"Medium","gaps":["Ordering of recruitment relative to other NHEJ factors incomplete","Endonuclease cleavage geometry not structurally defined"]},{"year":2006,"claim":"Showing strict DNA-PK/ATP/Ku dependence for processing 3'-phosphoglycolate termini explained Artemis hypersensitivity to radiomimetic agents that generate such ends.","evidence":"In vitro nuclease on phosphoglycolate substrates; survival assays with bleomycin/neocarzinostatin/X-rays","pmids":["17121861"],"confidence":"Medium","gaps":["Did not quantify contribution relative to other end-cleaning enzymes","In vivo flux not measured"]},{"year":2007,"claim":"Identifying ATM phosphosites S516/S645 mechanistically linked Artemis to G2/M checkpoint recovery through control of Cdk1-cyclin B localization and activation.","evidence":"Site-directed mutagenesis, phospho-antibodies, Cdk1-cyclin B co-IP and localization, checkpoint recovery assays","pmids":["17242184"],"confidence":"Medium","gaps":["Direct enzymatic basis of Cdk1-cyclin B regulation unclear","Single-lab findings"]},{"year":2007,"claim":"In vivo AAV ITR processing and class-switch recombination studies extended hairpin-opening and DSB-joining functions to additional biological substrates.","evidence":"rAAV genome analysis in deficient mice; IgH locus FISH in Artemis-/- B cells during CSR","pmids":["17686847","18316419"],"confidence":"Medium","gaps":["Tissue-specificity determinants of ITR processing unexplained","CSR role overlaps with DNA-PKcs and is not Artemis-unique"]},{"year":2008,"claim":"Ku80 C-terminus and apoptotic-pathway studies refined the activation hierarchy and revealed an additional pro-apoptotic function downstream of DNA-PKcs.","evidence":"Ku80 C-terminal deletion cells with nuclease assays; DT40 knockouts in etoposide-induced apoptosis with chromatin fractionation","pmids":["19103741","18674614"],"confidence":"Medium","gaps":["Nuclease substrate in apoptosis induction not defined","Single-lab/cell-system specific"]},{"year":2009,"claim":"Demonstrating Artemis/ATM requirement for HR in G2 redefined Artemis as a phase-specific repair factor that channels heterochromatin-associated DSBs into homologous recombination.","evidence":"Epistasis with Brca2/Rad51/Rad54, ssDNA and Rad51 foci, nuclease-dead mutant, KAP-1 depletion","pmids":["19779458"],"confidence":"High","gaps":["Precise endonucleolytic step initiating resection not defined","How phase determines NHEJ-vs-HR choice unresolved"]},{"year":2009,"claim":"Discovery of Fbw7 binding and p53 regulation expanded Artemis into cell-cycle/checkpoint control during replication and oxidative stress.","evidence":"Co-IP with Fbw7, cyclin E degradation and phospho-mutant analyses; siRNA epistasis showing DNA-PKcs-dependent p53 stabilization","pmids":["19423708","19398950"],"confidence":"Medium","gaps":["Mechanistic link between nuclease function and ubiquitin-ligase regulation unclear","Single-lab co-IP partners"]},{"year":2011,"claim":"Identifying the Cul4A-DDB1-DDB2 interaction tied Artemis to p27 degradation and G1 progression, a function apparently distinct from its DSB nuclease activity.","evidence":"Co-IP with DDB2 and p27, siRNA knockdown, p27 degradation and cell-cycle assays","pmids":["22134138"],"confidence":"Medium","gaps":["Whether nuclease activity is required is unknown","Single Co-IP-based partner identification"]},{"year":2012,"claim":"Mapping a direct Artemis C-terminus–Ligase IV interaction, later resolved structurally, showed how end processing is physically coupled to ligation during coding-joint formation.","evidence":"Co-IP/pulldown, point mutagenesis with V(D)J assays; X-ray crystallography of LigIV-DBD–Artemis peptide complex","pmids":["22529269","23219551"],"confidence":"High","gaps":["Did not capture the full Artemis-LigIV assembly on DNA","Temporal coordination with DNA-PKcs release unresolved"]},{"year":2014,"claim":"Defining Artemis as a PTIP-binding 53BP1-pathway effector clarified how it suppresses end resection and competes with HR, with therapeutic relevance in BRCA1-deficient cells.","evidence":"Co-IP with PTIP, genetic epistasis with PARP-inhibitor resistance in BRCA1-deficient cells","pmids":["25512557"],"confidence":"Medium","gaps":["Mechanism by which Artemis blocks resection not defined","Reconciliation with Artemis pro-HR role in G2 incomplete"]},{"year":2014,"claim":"Active-site analysis settled the long-standing question of activity origin, proving the 5'-exonuclease and endonuclease are intrinsic to Artemis and share one active site.","evidence":"Co-purification, H115A mutagenesis, cation dependence, parallel inhibitor sensitivity","pmids":["24500713","20117966"],"confidence":"High","gaps":["Structural basis for activity switching not yet defined here","Substrate-selection determinants unresolved"]},{"year":2017,"claim":"Showing X4-LIV can stimulate Artemis at 3' overhangs independently of DNA-PKcs revealed alternative, sequential activation routes during NHEJ.","evidence":"In vitro reconstitution with defined substrates varying NHEJ components","pmids":["28696258"],"confidence":"Medium","gaps":["In vivo relevance of DNA-PKcs-independent activation unclear","Order of factor handoff not directly visualized"]},{"year":2018,"claim":"Recruitment to stalled replication forks established a replication-stress role, with Artemis cleaving forks to promote restart and prevent mitotic mis-segregation.","evidence":"siRNA knockdown, chromatin fractionation, DNA fiber and mitotic segregation assays; non-epistatic with XPF-ERCC1","pmids":["30059501"],"confidence":"Medium","gaps":["Exact fork substrate cleaved by Artemis not defined","Regulation distinct from NHEJ recruitment unclear"]},{"year":2021,"claim":"Crystal structures of the Artemis catalytic domain explained its endonuclease bias via a unique second metal site and showed the isolated domain is catalytically self-sufficient, enabling inhibitor development.","evidence":"X-ray crystallography of wildtype and variant catalytic domain, endonuclease assays, ebselen inhibition","pmids":["34387696"],"confidence":"High","gaps":["Did not show full-length autoinhibited architecture","Substrate-bound catalytic state not captured"]},{"year":2022,"claim":"Cryo-EM of the basal Artemis:DNA-PKcs complex visualized the pre-activation architecture and revealed mutually exclusive Artemis/XRCC4 binding on DNA-PKcs, explaining ordered NHEJ assembly.","evidence":"Cryo-EM of basal complex, XRCC4 peptide competition assays","pmids":["35801871"],"confidence":"High","gaps":["Activated (post-autophosphorylation) state not resolved","DNA-engaged cleavage-competent conformation undefined"]},{"year":null,"claim":"It remains unresolved how a single nuclease is allosterically switched between exo- and endonucleolytic modes and how its many regulatory partners (DNA-PKcs, LigIV, PTIP, Fbw7, DDB2, MRN) are temporally coordinated to dictate NHEJ-versus-HR pathway choice across cell-cycle phases.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the activated DNA-bound cleavage complex","Mechanism integrating repair and checkpoint/ubiquitin-ligase functions unknown","How resection-suppression and pro-HR roles are reconciled is unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[0,4,6,18,21]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,21]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,20,22]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[10]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[11,25]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[0,2,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,9,31]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[13,28,29]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,10,24]}],"complexes":["Artemis:DNA-PKcs complex","DNA-PK (Ku/DNA-PKcs/Artemis) chromatin complex"],"partners":["PRKDC","LIG4","XRCC4","XRCC6","PAXIP1","FBXW7","DDB2","CDKN1B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96SD1","full_name":"Protein artemis","aliases":["DNA cross-link repair 1C protein","Protein A-SCID","SNM1 homolog C","hSNM1C","SNM1-like protein"],"length_aa":692,"mass_kda":78.4,"function":"Nuclease involved in DNA non-homologous end joining (NHEJ); required for double-strand break repair and V(D)J recombination (PubMed:11336668, PubMed:11955432, PubMed:12055248, PubMed:14744996, PubMed:15071507, PubMed:15574326, PubMed:15936993). Required for V(D)J recombination, the process by which exons encoding the antigen-binding domains of immunoglobulins and T-cell receptor proteins are assembled from individual V, (D), and J gene segments (PubMed:11336668, PubMed:11955432, PubMed:14744996). V(D)J recombination is initiated by the lymphoid specific RAG endonuclease complex, which generates site specific DNA double strand breaks (DSBs) (PubMed:11336668, PubMed:11955432, PubMed:14744996). These DSBs present two types of DNA end structures: hairpin sealed coding ends and phosphorylated blunt signal ends (PubMed:11336668, PubMed:11955432, PubMed:14744996). These ends are independently repaired by the non homologous end joining (NHEJ) pathway to form coding and signal joints respectively (PubMed:11336668, PubMed:11955432, PubMed:14744996). This protein exhibits single-strand specific 5'-3' exonuclease activity in isolation and acquires endonucleolytic activity on 5' and 3' hairpins and overhangs when in a complex with PRKDC (PubMed:11955432, PubMed:15071507, PubMed:15574326, PubMed:15936993). The latter activity is required specifically for the resolution of closed hairpins prior to the formation of the coding joint (PubMed:11955432). Also required for the repair of complex DSBs induced by ionizing radiation, which require substantial end-processing prior to religation by NHEJ (PubMed:15456891, PubMed:15468306, PubMed:15574327, PubMed:15811628)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96SD1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DCLRE1C","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DCLRE1C","total_profiled":1310},"omim":[{"mim_id":"615966","title":"IMMUNODEFICIENCY 26 WITH OR WITHOUT NEUROLOGIC ABNORMALITIES; IMD26","url":"https://www.omim.org/entry/615966"},{"mim_id":"611291","title":"IMMUNODEFICIENCY 124, SEVERE COMBINED; IMD124","url":"https://www.omim.org/entry/611291"},{"mim_id":"611290","title":"NONHOMOLOGOUS END-JOINING FACTOR 1; NHEJ1","url":"https://www.omim.org/entry/611290"},{"mim_id":"609683","title":"DNA CROSS-LINK REPAIR PROTEIN 1B; DCLRE1B","url":"https://www.omim.org/entry/609683"},{"mim_id":"605988","title":"DNA CROSS-LINK REPAIR PROTEIN 1C; DCLRE1C","url":"https://www.omim.org/entry/605988"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DCLRE1C"},"hgnc":{"alias_symbol":["ARTEMIS","FLJ11360","SNM1C","A-SCID"],"prev_symbol":["SCIDA"]},"alphafold":{"accession":"Q96SD1","domains":[{"cath_id":"3.60.15.10","chopping":"8-174_324-363","consensus_level":"high","plddt":95.7178,"start":8,"end":363},{"cath_id":"3.40.50.12650","chopping":"180-317","consensus_level":"high","plddt":92.3864,"start":180,"end":317}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96SD1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96SD1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96SD1-F1-predicted_aligned_error_v6.png","plddt_mean":69.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DCLRE1C","jax_strain_url":"https://www.jax.org/strain/search?query=DCLRE1C"},"sequence":{"accession":"Q96SD1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96SD1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96SD1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96SD1"}},"corpus_meta":[{"pmid":"11120685","id":"PMC_11120685","title":"Artemis: 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DNA. Purified Artemis alone possesses 5' to 3' single-strand-specific exonuclease activity. Upon complex formation, DNA-PKcs phosphorylates Artemis, and Artemis acquires endonucleolytic activity on 5' and 3' overhangs as well as hairpins. The Artemis:DNA-PKcs complex can open hairpins generated by the RAG complex.\",\n      \"method\": \"In vitro reconstitution, purified protein biochemical assays, endonuclease/exonuclease activity assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified components, multiple orthogonal activity assays, foundational mechanistic paper replicated by many subsequent studies\",\n      \"pmids\": [\"11955432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Artemis is a novel protein whose mutations cause human RS-SCID. Protein sequence analysis identifies Artemis as a member of the metallo-beta-lactamase superfamily, involved in V(D)J recombination and DNA double-strand break repair.\",\n      \"method\": \"Positional cloning, protein sequence analysis, genetic mutation identification in patients\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gene identified by positional cloning with patient mutations, replicated across multiple subsequent studies\",\n      \"pmids\": [\"11336668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATM and Artemis function in a common DSB repair pathway (epistasis analysis). Radiation-induced Artemis hyperphosphorylation is ATM-dependent. The DSB repair process requires Artemis nuclease activity and rejoins approximately 10% of radiation-induced DSBs. Artemis is a downstream component of the ATM signaling pathway required for DSB repair but dispensable for ATM-dependent cell cycle checkpoint arrest.\",\n      \"method\": \"Epistasis analysis, irradiation survival assays, phosphorylation analysis, nuclease-dead mutants\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple NHEJ/DSB repair factors, replicated across labs\",\n      \"pmids\": [\"15574327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DNA-PKcs autophosphorylation at the T2609-T2647 cluster (in the presence of Ku and target DNA) is required for Artemis-mediated endonuclease activity. Autophosphorylated DNA-PKcs stably associates with Ku-bound DNA with large single-stranded overhangs until overhang cleavage by Artemis. Artemis phosphorylation per se (at S503, S516, S645) is dispensable for endonuclease activity in vitro and for DSB repair and V(D)J recombination in vivo.\",\n      \"method\": \"In vitro endonuclease assays with autophosphorylation mutants of DNA-PKcs, cell-based V(D)J recombination assays, phospho-specific antibodies\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis of DNA-PKcs autophosphorylation sites, combined with in vivo V(D)J recombination assay\",\n      \"pmids\": [\"16874298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Active-site mutagenesis of eight conserved histidine and aspartate residues within the metallo-beta-lactamase domain of Artemis abolishes both hairpin-opening and overhang endonucleolytic activities but does not impair 5' to 3' exonuclease activity, indicating that hairpin-opening/endonuclease activity is necessary for V(D)J recombination while exonuclease activity is not sufficient.\",\n      \"method\": \"Site-directed mutagenesis of catalytic residues, in vitro biochemical nuclease assays, in vivo V(D)J recombination assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — active-site mutagenesis combined with in vitro activity assays and in vivo recombination assay in single rigorous study\",\n      \"pmids\": [\"15071507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"All DNA-PKcs phosphorylation sites on Artemis (11 sites) and three basal phosphorylation sites are located in the C-terminal domain. Phosphatase-treated Artemis and Artemis mutated at basal phosphorylation sites retain DNA-PKcs-dependent endonucleolytic activities. The C-terminal domain may have a negative regulatory effect on Artemis endonucleolytic activities, and phosphorylation by DNA-PKcs in the C-terminal domain may relieve this inhibition.\",\n      \"method\": \"Mass spectrometry phosphosite mapping, in vitro kinase assays, endonuclease activity assays with phosphorylation mutants\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS-based phosphosite identification combined with biochemical activity assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"16093244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Artemis:DNA-PKcs complex cleaves DNA loops, flaps, and gaps — all substrates containing single-to-double-strand transitions — near the transition region. This versatile structure-specific endonuclease activity depends on complex formation and is important for NHEJ of incompatible DNA ends.\",\n      \"method\": \"In vitro endonuclease assays with defined DNA substrates (heterologous loops, stem-loops, flaps, gapped substrates)\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple defined substrate structures, single lab\",\n      \"pmids\": [\"15936993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A region of the Artemis C-terminal tail mediates interaction with DNA-PKcs. C-terminally truncated Artemis variants exhibit intrinsic hairpin-opening activity without DNA-PKcs activation, indicating that autoinhibition by the C-terminal tail is relieved by DNA-PKcs phosphorylation. DNA-PKcs may also optimally configure 5' and 3' overhang substrates for Artemis endonucleolytic function.\",\n      \"method\": \"C-terminal truncation mutant analysis, in vitro nuclease assays, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biochemical dissection with truncation mutants and in vitro activity assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16914548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In G2 phase, Artemis (requiring its endonuclease activity) and ATM are required for homologous recombination repair of approximately 15% of radiation-induced DSBs, promoting single-stranded DNA and Rad51 foci formation. ATM and Artemis promote NHEJ in G1 but HR in G2, and this HR in G2 repairs heterochromatin-associated DSBs (dependency relieved by KAP-1 depletion).\",\n      \"method\": \"Epistasis analysis with siRNA knockdown of Artemis, Brca2, Rad51, Rad54; gamma-H2AX and Rad51 foci analysis; nuclease-dead Artemis mutant\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis analysis with multiple repair factors, nuclease-dead mutant, replicated findings from multiple labs\",\n      \"pmids\": [\"19779458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Artemis-deficient mice display severe combined immunodeficiency with defects in opening and joining V(D)J coding hairpin ends and increased ionizing radiation sensitivity, phenocopying DNA-PKcs-deficient mice. Artemis deficiency leads to chromosomal instability in fibroblasts. Signal joint formation is intact while coding joint formation is impaired, consistent with a hairpin coding end opening defect.\",\n      \"method\": \"Artemis knockout mouse model, V(D)J recombination assays, radiation sensitivity assays, chromosomal stability analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with defined lymphoid and DNA repair phenotypes, replicated across multiple labs\",\n      \"pmids\": [\"12504013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The SCIDA (Athabascan SCID) gene is identified as Artemis (SNM1-like). A founder nonsense mutation truncates the protein in 21 SCIDA patients. Wild-type Artemis complements defective coding joint and reduced signal joint formation in SCIDA fibroblasts. Artemis encodes a nuclear protein.\",\n      \"method\": \"Positional cloning, complementation assay in patient fibroblasts, subcellular localization by immunostaining\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complementation assay establishing functional requirement, nuclear localization by direct experiment, replicated with original Artemis discovery\",\n      \"pmids\": [\"12055248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Artemis is mobilized to damaged chromatin together with DNA-PK and XRCC4/ligase IV upon DSB induction. DNA-PKcs is necessary for loading of Artemis on damaged DNA. DNA-PKcs kinase activity maintains Artemis association with the DNA-PK:DNA complex, while Ku mediates assembly of DNA-PK on DNA ends and is responsible for dissociation of the DNA-PKcs:Artemis complex under kinase-preventive conditions.\",\n      \"method\": \"Cell fractionation/chromatin immunoprecipitation, co-immunoprecipitation in nuclear extracts, in vitro DNA-binding assays with kinase inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and chromatin fractionation, single lab, two orthogonal methods\",\n      \"pmids\": [\"16857680\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Artemis is phosphorylated by ATM or ATR following ionizing radiation or UV irradiation, respectively. Artemis interacts with known cell cycle checkpoint proteins. Artemis is required for the maintenance of normal DNA damage-induced G2/M cell cycle arrest.\",\n      \"method\": \"Phosphorylation analysis after DNA damage, co-immunoprecipitation with checkpoint proteins, G2/M checkpoint assay in Artemis-depleted cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with checkpoint proteins and phosphorylation analysis with cell-cycle phenotype, single lab\",\n      \"pmids\": [\"15456891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ATM phosphorylates Artemis at S516 and S645 in response to ionizing radiation. Mutation of S516 and S645 results in defective recovery from the G2/M checkpoint. Mutant Artemis promotes enhanced interaction between unphosphorylated cyclin B and Cdk1, causing inhibitory Wee1-mediated phosphorylation of Cdk1, and causes retention of Cdk1-cyclin B in the centrosome with inhibition of nuclear import during prophase.\",\n      \"method\": \"Site-directed mutagenesis, phospho-specific antibodies, co-immunoprecipitation, immunofluorescence localization of Cdk1-cyclin B, G2/M checkpoint recovery assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis with multiple downstream readouts, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17242184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Artemis is a PTIP-binding protein (identified by co-immunoprecipitation). Loss of Artemis restores PARP-inhibitor resistance in BRCA1-deficient cells, placing Artemis as the major downstream effector of the 53BP1 pathway, which prevents end resection and promotes NHEJ in competition with homologous recombination.\",\n      \"method\": \"Co-immunoprecipitation, genetic epistasis (Artemis loss-of-function in BRCA1-deficient cells), cell survival assays with PARP inhibitors\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying new binding partner, genetic epistasis with functional phenotype, single lab\",\n      \"pmids\": [\"25512557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The Artemis C-terminal region directly interacts with the DNA-binding domain of DNA Ligase IV. This interaction is specific and independent of DNA and DNA-PKcs. Point mutations in Artemis disrupting Ligase IV or DNA-PKcs interactions reduce V(D)J recombination coding joint formation, with additive effects when both interactions are disrupted. Signal joint formation is unaffected.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, point mutagenesis, V(D)J recombination assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus mutagenesis with functional V(D)J recombination readout, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"22529269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the DNA Ligase IV DNA-binding domain in complex with a peptide from the Artemis C-terminal region reveals that LigIV interacts with Artemis through an extended hydrophobic surface. Helix α2 in LigIV-DBD is longer than in other mammalian ligases and presents residues specifically interacting with Artemis. Mutations of key LigIV-DBD hydrophobic surface residues abolish the interaction.\",\n      \"method\": \"X-ray crystallography of LigIV-DBD apo and Artemis peptide complex, mutagenesis confirming interface\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validation of interaction interface\",\n      \"pmids\": [\"23219551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of the basal (pre-activated) state Artemis:DNA-PKcs complex show the Artemis catalytic domain dynamically positioned externally to DNA-PKcs prior to ABCDE autophosphorylation. Both catalytic and regulatory domains of Artemis interact with N-HEAT and FAT domains of DNA-PKcs. A mutually exclusive binding site exists for Artemis and XRCC4 on DNA-PKcs; an XRCC4 peptide disrupts the Artemis:DNA-PKcs complex.\",\n      \"method\": \"Cryo-EM structural analysis, agarose-acrylamide gel system for complex stabilization, XRCC4 peptide competition assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structure with functional competition experiments, single study\",\n      \"pmids\": [\"35801871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of the catalytic domain of wildtype and variant Artemis reveal a second metal binding site in the β-CASP domain unique to Artemis (absent in SNM1A/SNM1B), explaining predominantly endonucleolytic activity. The catalytic domain alone has similar endonuclease activity to phosphorylated full-length protein. An RS-SCID Omenn syndrome variant is structurally characterized. Ebselen can inhibit the second metal binding site.\",\n      \"method\": \"X-ray crystallography of Artemis catalytic domain (wildtype and variants), in vitro endonuclease activity assays, small molecule inhibitor testing\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with biochemical activity validation, inhibitor testing, single rigorous study\",\n      \"pmids\": [\"34387696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Processing of 3'-phosphoglycolate-terminated DNA double-strand break termini by Artemis nuclease is completely dependent on DNA-dependent protein kinase and ATP, and is largely dependent on Ku. Artemis efficiently removes terminal nucleotides from phosphoglycolate-terminated 3' overhangs in a manner distinct from hydroxyl-terminated substrates. Human cells lacking Artemis are hypersensitive to bleomycin, neocarzinostatin, and X-rays, which all induce 3'-phosphoglycolate-terminated DSBs.\",\n      \"method\": \"In vitro Artemis nuclease assays with 3'-phosphoglycolate substrates, cell survival assays with DNA-damaging agents in Artemis-deficient cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with modified substrates plus cell-based phenotype, single lab\",\n      \"pmids\": [\"17121861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Purified Artemis exhibits single-stranded DNA endonuclease activity that is stimulated by DNA-PKcs. The divalent cation dependence and sequence dependence of this single-stranded endonuclease activity parallels the double-stranded DNA endonuclease activity of Artemis:DNA-PKcs.\",\n      \"method\": \"In vitro endonuclease assays with purified Artemis and ssDNA substrates, modulation by antibodies and DNA-PKcs\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified protein, multiple substrate types, single lab\",\n      \"pmids\": [\"20117966\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The 5'-exonuclease and endonuclease activities of Artemis co-purify and share the same active site: the H115A point mutant markedly reduces both activities, divalent cation effects on both activities parallel one another, and small molecule inhibitors block both activities in parallel. The 5'-exonuclease is intrinsic to Artemis.\",\n      \"method\": \"Co-purification analysis, active-site mutagenesis (H115A), divalent cation dependence assays, small molecule inhibitor studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis with multiple orthogonal methods (mutagenesis, cation dependence, inhibitors) in single study\",\n      \"pmids\": [\"24500713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Artemis resects iteratively into blunt DNA ends with efficiency reflecting AT-richness (DNA end breathing requirement). GC-rich blunt ends are not cut by Artemis alone. All blunt DNA ends are cut when DNA-PKcs and Ku accompany Artemis, but not when Ku is omitted — demonstrating Ku dependence of Artemis action on blunt DNA ends.\",\n      \"method\": \"In vitro nuclease assays with blunt and fixed pseudo-Y DNA structures, systematic variation of Ku presence/absence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with defined substrates, single lab\",\n      \"pmids\": [\"26276388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The Ku80 carboxy terminus supports DNA-PKcs autophosphorylation at Thr2647 (but not Ser2056), which in turn is required for Artemis nuclease activity in vivo and in vitro. Cells with Ku80 C-terminal deletion show severely reduced Artemis endonuclease activity.\",\n      \"method\": \"Ku80 carboxy-terminal deletion cell lines, phospho-specific antibodies, in vitro and in vivo Artemis nuclease activity assays, IR sensitivity\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell lines with defined mutations, in vitro and in vivo nuclease activity assays, single lab\",\n      \"pmids\": [\"19103741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A DNA-PKcs missense mutation (L3062R) in an RS-SCID patient does not affect kinase activity or DNA end-binding capacity per se, but causes insufficient Artemis activation dependent on interaction with autophosphorylated DNA-PKcs, resulting in long P-nucleotide stretches in immunoglobulin coding joints.\",\n      \"method\": \"Patient mutation identification, heterologous expression system functional assay, immunoglobulin junction analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient mutation with functional complementation and molecular readout, single study\",\n      \"pmids\": [\"19075392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Artemis phosphorylated by DNA-PKcs at S516 and S645 is concentrated in chromatin-associated nuclear foci in naïve cells. Phosphorylation at both sites in vivo shows dependence on DNA-PKcs association and is additionally stimulated by double-stranded DNA damage. The interface on Artemis required for DNA-PKcs association was delimited.\",\n      \"method\": \"Phospho-specific antibody immunofluorescence, chromatin fractionation, co-immunoprecipitation, V(D)J recombination assay with stable substrates\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phospho-specific antibodies with chromatin localization and co-IP, single lab\",\n      \"pmids\": [\"16600297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Artemis is constitutively phosphorylated in cultured cells and undergoes additional IR-induced phosphorylation that is mainly but not solely ATM-dependent. In vitro-generated Artemis mutants with impaired IR-induced phosphorylation still display activity sufficient to complement V(D)J recombination defects and radiosensitivity of Artemis-deficient cells.\",\n      \"method\": \"Phosphorylation analysis, ATM-deficient cell lines, complementation assay in Artemis-deficient cells, V(D)J recombination assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complementation with phosphorylation mutants in patient cells, single lab\",\n      \"pmids\": [\"15468306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Artemis is hyperphosphorylated in an ATM- and Nbs1-dependent manner in response to ionizing radiation, with S645 being a contributing SQ/TQ site. Reintroduction of wild-type ATM or Nbs1 reconstituted Artemis hyperphosphorylation in deficient cells. Hyperphosphorylated Artemis physically associates with the Mre11/Rad50/Nbs1 complex in an ATM-dependent manner in response to IR-induced DSBs.\",\n      \"method\": \"Phosphorylation analysis in ATM/Nbs1 null cells, complementation with wild-type ATM/Nbs1, co-immunoprecipitation of Artemis with MRN complex\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with MRN complex, complementation in null cells, single lab\",\n      \"pmids\": [\"15723659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Artemis interacts with the Cul4A-DDB1 E3 ubiquitin ligase via direct interaction with substrate-specificity receptor DDB2. Artemis also interacts with CDK inhibitor p27. Both DDB2 and Artemis are required for degradation of p27 mediated by this complex. Regulation of p27 by Artemis and DDB2 controls cell cycle progression in normally proliferating cells and in response to serum deprivation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of Artemis and DDB2, p27 degradation assays, cell cycle analysis\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP identifying two new binding partners with functional p27 degradation readout, single lab\",\n      \"pmids\": [\"22134138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Artemis interacts with the F-box protein Fbw7. This interaction, regulated by ATR-mediated phosphorylation at Ser516 and Ser645 in response to replication stress, promotes ubiquitylation and degradation of cyclin E through the SCFFbw7 E3 ubiquitin ligase complex. Mutation of Ser516/Ser645 causes prolonged S phase checkpoint recovery coinciding with stabilization of cyclin E and downregulation of Cdk2 kinase activity.\",\n      \"method\": \"Co-immunoprecipitation (Artemis-Fbw7), cyclin E degradation assays, phospho-mutant analysis, cell cycle recovery assays after UV/aphidicolin/hydroxyurea\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with new binding partner, phospho-mutant functional analysis with multiple replication stress agents, single lab\",\n      \"pmids\": [\"19423708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Artemis is a negative regulator of p53 in response to oxidative stress generated by mitochondrial respiration. Depletion of Artemis leads to spontaneous DNA-PKcs-dependent phosphorylation and stabilization of p53, resulting in G1 arrest and apoptosis. Co-depletion of DNA-PKcs (but not ATM) suppresses these effects.\",\n      \"method\": \"siRNA knockdown of Artemis and DNA-PKcs, p53 phosphorylation/stabilization assays, cell cycle analysis, antioxidant and mitochondrial inhibitor treatments\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via co-depletion with mechanistic specificity for DNA-PKcs vs ATM, multiple perturbation conditions, single lab\",\n      \"pmids\": [\"19398950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DNA-PKcs and Artemis are required for joining a subset of AID-dependent DSBs during immunoglobulin class switch recombination. In the absence of either factor, B cells activated for CSR frequently generate AID-dependent IgH locus chromosomal breaks and translocations.\",\n      \"method\": \"IgH locus-specific FISH assay in DNA-PKcs-/- and Artemis-/- B cells activated for CSR, chromosomal break/translocation analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout cells with locus-specific FISH, defined molecular phenotype, single lab\",\n      \"pmids\": [\"18316419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"DNA-PKcs and Artemis open AAV inverted terminal repeat (ITR) hairpin loops in a tissue-dependent manner in vivo. In the absence of either factor, ITR hairpin opening is impaired and double-stranded linear rAAV genomes with covalently closed hairpin termini accumulate. The 5' end of 3-base hairpin loops of the ITR is the primary target for DNA-PKcs- and Artemis-mediated cleavage.\",\n      \"method\": \"Recombinant AAV infection of DNA-PKcs- and Artemis-deficient mice, Southern blot analysis of rAAV genome metabolism in multiple tissues\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with defined molecular readout (hairpin opening), two tissue types, single lab\",\n      \"pmids\": [\"17686847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"XRCC4-DNA ligase IV (X4-LIV) stimulates Artemis nuclease activity on 3' overhangs in a DNA-PKcs-independent manner. X4-LIV cannot stimulate Artemis at hairpins or 5' overhangs. X4-LIV and DNA-PKcs interfere with each other with respect to stimulating Artemis at 3' overhangs, consistent with sequential rather than concurrent recruitment.\",\n      \"method\": \"In vitro nuclease assays and ligation assays with defined DNA substrate configurations, systematic variation of NHEJ protein components\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components and defined substrates, single lab\",\n      \"pmids\": [\"28696258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Artemis endonuclease (along with XPF-ERCC1) cleaves stalled DNA replication forks during S and G2 phases in response to replication stress, through non-epistatic pathways. Both nucleases are recruited to chromatin to promote replication fork restart. Artemis- and XPF-mediated rapid replication fork breakage prevents mitotic segregation defects.\",\n      \"method\": \"siRNA knockdown of Artemis and XPF-ERCC1, chromatin fractionation, DNA fiber assays, mitotic segregation analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with chromatin recruitment and defined replication/mitosis phenotypes, single lab\",\n      \"pmids\": [\"30059501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KU70, DNA-PKcs, and Artemis are essential for the rapid induction of apoptosis after massive DSB formation by high-dose etoposide. KU70 acts upstream of DNA-PKcs and Artemis acts downstream of DNA-PKcs in this apoptotic pathway. KU70 is required for chromatin binding of DNA-PKcs while Artemis is not required for DNA-PKcs chromatin binding, placing Artemis downstream of DNA-PKcs in apoptosis induction.\",\n      \"method\": \"Gene-targeted knockout DT40 cells, etoposide-induced apoptosis assay, caspase inhibitor studies, chromatin fractionation of DNA-PKcs in presence/absence of Artemis\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis analysis with clean knockouts, multiple downstream readouts, single lab\",\n      \"pmids\": [\"18674614\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Artemis (DCLRE1C) is a metallo-β-lactamase/β-CASP domain endonuclease that forms a stable complex with DNA-PKcs; alone it has 5'-to-3' exonuclease activity on single-stranded DNA, but upon binding DNA-PKcs (which both phosphorylates Artemis and undergoes ABCDE-cluster autophosphorylation to relieve Artemis C-terminal autoinhibition), it acquires structure-specific endonuclease activity at hairpins, 5' and 3' overhangs, loops, flaps, and single-to-double-strand junctions — activities essential for opening RAG-generated coding hairpins during V(D)J recombination, processing a subset (~10%) of radiation-induced DSBs in heterochromatin in an ATM-dependent pathway, and promoting HR repair in G2; additionally, ATM/ATR-mediated phosphorylation of Artemis at S516/S645 regulates G2/M and S-phase checkpoint recovery through interactions with Cdk1-cyclin B and the SCF-Fbw7/cyclin E axis, the Artemis C-terminus interacts with DNA Ligase IV and DNA-PKcs to coordinate ligation during NHEJ, and Artemis also associates with PTIP (downstream of 53BP1) to suppress end resection and HR, with the Cul4A-DDB1-DDB2 E3 ligase to regulate p27 degradation and G1 progression, and with the MRN complex downstream of ATM.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DCLRE1C encodes Artemis, a nuclear metallo-\\u03b2-lactamase/\\u03b2-CASP-superfamily nuclease that is the principal structure-specific endonuclease of non-homologous end joining (NHEJ) and V(D)J recombination [#0, #1, #10]. Purified Artemis intrinsically possesses 5'-to-3' single-stranded DNA exonuclease activity, but upon forming a stable, DNA-independent complex with DNA-PKcs it gains endonucleolytic activity at hairpins, 5' and 3' overhangs, loops, flaps, gaps, and other single-to-double-strand transitions [#0, #6]. Both the exo- and endonuclease activities share a single active site within the metallo-\\u03b2-lactamase domain, where mutagenesis of conserved histidine/aspartate residues (including H115) abolishes endonuclease and hairpin-opening function; a second \\u03b2-CASP metal site unique to Artemis explains its predominantly endonucleolytic behavior [#4, #18, #21]. Activation is gated by DNA-PKcs autophosphorylation at the T2609\\u2013T2647 cluster, which relieves an autoinhibitory Artemis C-terminal tail rather than requiring direct Artemis phosphorylation; truncating this tail yields constitutive hairpin-opening activity, and Ku80 supports the relevant autophosphorylation [#3, #5, #7, #23]. Within NHEJ, the Artemis C-terminus directly binds the DNA Ligase IV DNA-binding domain through an extended hydrophobic interface to coordinate end processing with ligation, while Artemis and XRCC4 occupy mutually exclusive sites on DNA-PKcs, enforcing sequential recruitment during repair [#15, #16, #17, #33]. Loss of Artemis causes radiosensitive severe combined immunodeficiency (RS-SCID) through a failure to open RAG-generated coding hairpins, producing defective coding-joint formation while signal joints remain intact [#1, #9, #10]. Beyond canonical end joining, Artemis acts downstream of ATM with the MRN complex to repair a slow-repairing, heterochromatin-associated subset of radiation-induced double-strand breaks and to promote homologous recombination in G2, and is regulated by ATM/ATR phosphorylation at S516/S645 governing G2/M and S-phase checkpoint recovery via Cdk1\\u2013cyclin B and SCF-Fbw7/cyclin E control [#2, #8, #13, #27, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Establishing the gene's identity answered why a class of human SCID arose, linking an uncharacterized metallo-\\u03b2-lactamase-family protein to V(D)J recombination and DSB repair.\",\n      \"evidence\": \"Positional cloning and sequence analysis of patient mutations causing RS-SCID\",\n      \"pmids\": [\"11336668\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the biochemical activity of the protein\", \"No mechanism for how mutations impair recombination\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Reconstitution with purified components answered what Artemis does enzymatically and how it is switched on, defining the DNA-PKcs-dependent acquisition of endonuclease and hairpin-opening activity.\",\n      \"evidence\": \"In vitro reconstitution with purified Artemis and DNA-PKcs, endo/exonuclease assays, RAG-hairpin opening\",\n      \"pmids\": [\"11955432\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which active site mediates each activity\", \"Mechanism of DNA-PKcs activation of Artemis not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Knockout mice and patient complementation established the in vivo physiological requirement, showing Artemis loss specifically blocks coding-hairpin opening while sparing signal joints, and confers radiosensitivity and genomic instability.\",\n      \"evidence\": \"Artemis-null mice, V(D)J and radiation assays; complementation of SCIDA patient fibroblasts with nuclear localization\",\n      \"pmids\": [\"12504013\", \"12055248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address Artemis roles outside lymphoid development\", \"Subcellular dynamics during repair not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Active-site mutagenesis answered which catalytic function is required for recombination, separating dispensable exonuclease from essential endonuclease/hairpin-opening activity.\",\n      \"evidence\": \"Mutagenesis of eight conserved His/Asp residues with in vitro nuclease and in vivo V(D)J assays\",\n      \"pmids\": [\"15071507\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine whether exo and endo activities use one or two active sites\", \"Structural basis unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Epistasis analysis placed Artemis genetically downstream of ATM in repair of a defined minor DSB subset, distinguishing its repair role from checkpoint signaling.\",\n      \"evidence\": \"Epistasis, irradiation survival, ATM-dependent phosphorylation, nuclease-dead mutants\",\n      \"pmids\": [\"15574327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the chromatin context of the ~10% slow-repair fraction\", \"Did not define the repair pathway used\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"DNA-damage phosphorylation studies connected Artemis to checkpoint machinery, showing ATM/ATR phosphorylation and a requirement for normal G2/M arrest.\",\n      \"evidence\": \"Phosphorylation after IR/UV, co-IP with checkpoint proteins, G2/M assays; complementation with phospho-mutants\",\n      \"pmids\": [\"15456891\", \"15468306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phospho-mutants still complemented V(D)J/radiosensitivity, leaving checkpoint role functionally separable\", \"Direct checkpoint effectors not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Phosphosite mapping clarified the regulatory logic, localizing DNA-PKcs phosphorylation to a C-terminal domain that exerts negative regulation relieved upon phosphorylation.\",\n      \"evidence\": \"Mass-spec phosphosite mapping, kinase and endonuclease assays with phospho-mutants\",\n      \"pmids\": [\"16093244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show direct structural autoinhibition\", \"Did not exclude phosphorylation-independent activation\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showing ATM/Nbs1-dependent hyperphosphorylation and MRN association integrated Artemis into the ATM-MRN DSB-response axis.\",\n      \"evidence\": \"Phosphorylation in ATM/Nbs1-null cells, complementation, co-IP with MRN\",\n      \"pmids\": [\"15723659\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of MRN association not defined\", \"Single-lab co-IP without structural detail\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mechanistic dissection of activation showed DNA-PKcs autophosphorylation (T2609-T2647 cluster), not Artemis phosphorylation per se, licenses endonuclease activity, and that C-terminal truncation relieves autoinhibition.\",\n      \"evidence\": \"DNA-PKcs autophosphorylation mutants, Artemis truncation mutants, in vitro nuclease, in vivo V(D)J\",\n      \"pmids\": [\"16874298\", \"16914548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic basis of autoinhibition unresolved at the time\", \"Did not define DNA-PKcs conformational changes driving activation\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Substrate-range and recruitment studies broadened the role to a general structure-specific endonuclease that is loaded and retained on damaged chromatin by DNA-PKcs.\",\n      \"evidence\": \"In vitro assays on loops/flaps/gaps; chromatin fractionation and co-IP with DNA-PK and XRCC4/LigIV; phospho-foci localization\",\n      \"pmids\": [\"15936993\", \"16857680\", \"16600297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ordering of recruitment relative to other NHEJ factors incomplete\", \"Endonuclease cleavage geometry not structurally defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showing strict DNA-PK/ATP/Ku dependence for processing 3'-phosphoglycolate termini explained Artemis hypersensitivity to radiomimetic agents that generate such ends.\",\n      \"evidence\": \"In vitro nuclease on phosphoglycolate substrates; survival assays with bleomycin/neocarzinostatin/X-rays\",\n      \"pmids\": [\"17121861\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not quantify contribution relative to other end-cleaning enzymes\", \"In vivo flux not measured\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying ATM phosphosites S516/S645 mechanistically linked Artemis to G2/M checkpoint recovery through control of Cdk1-cyclin B localization and activation.\",\n      \"evidence\": \"Site-directed mutagenesis, phospho-antibodies, Cdk1-cyclin B co-IP and localization, checkpoint recovery assays\",\n      \"pmids\": [\"17242184\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic basis of Cdk1-cyclin B regulation unclear\", \"Single-lab findings\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"In vivo AAV ITR processing and class-switch recombination studies extended hairpin-opening and DSB-joining functions to additional biological substrates.\",\n      \"evidence\": \"rAAV genome analysis in deficient mice; IgH locus FISH in Artemis-/- B cells during CSR\",\n      \"pmids\": [\"17686847\", \"18316419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Tissue-specificity determinants of ITR processing unexplained\", \"CSR role overlaps with DNA-PKcs and is not Artemis-unique\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Ku80 C-terminus and apoptotic-pathway studies refined the activation hierarchy and revealed an additional pro-apoptotic function downstream of DNA-PKcs.\",\n      \"evidence\": \"Ku80 C-terminal deletion cells with nuclease assays; DT40 knockouts in etoposide-induced apoptosis with chromatin fractionation\",\n      \"pmids\": [\"19103741\", \"18674614\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclease substrate in apoptosis induction not defined\", \"Single-lab/cell-system specific\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating Artemis/ATM requirement for HR in G2 redefined Artemis as a phase-specific repair factor that channels heterochromatin-associated DSBs into homologous recombination.\",\n      \"evidence\": \"Epistasis with Brca2/Rad51/Rad54, ssDNA and Rad51 foci, nuclease-dead mutant, KAP-1 depletion\",\n      \"pmids\": [\"19779458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise endonucleolytic step initiating resection not defined\", \"How phase determines NHEJ-vs-HR choice unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery of Fbw7 binding and p53 regulation expanded Artemis into cell-cycle/checkpoint control during replication and oxidative stress.\",\n      \"evidence\": \"Co-IP with Fbw7, cyclin E degradation and phospho-mutant analyses; siRNA epistasis showing DNA-PKcs-dependent p53 stabilization\",\n      \"pmids\": [\"19423708\", \"19398950\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between nuclease function and ubiquitin-ligase regulation unclear\", \"Single-lab co-IP partners\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying the Cul4A-DDB1-DDB2 interaction tied Artemis to p27 degradation and G1 progression, a function apparently distinct from its DSB nuclease activity.\",\n      \"evidence\": \"Co-IP with DDB2 and p27, siRNA knockdown, p27 degradation and cell-cycle assays\",\n      \"pmids\": [\"22134138\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether nuclease activity is required is unknown\", \"Single Co-IP-based partner identification\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Mapping a direct Artemis C-terminus\\u2013Ligase IV interaction, later resolved structurally, showed how end processing is physically coupled to ligation during coding-joint formation.\",\n      \"evidence\": \"Co-IP/pulldown, point mutagenesis with V(D)J assays; X-ray crystallography of LigIV-DBD\\u2013Artemis peptide complex\",\n      \"pmids\": [\"22529269\", \"23219551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not capture the full Artemis-LigIV assembly on DNA\", \"Temporal coordination with DNA-PKcs release unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining Artemis as a PTIP-binding 53BP1-pathway effector clarified how it suppresses end resection and competes with HR, with therapeutic relevance in BRCA1-deficient cells.\",\n      \"evidence\": \"Co-IP with PTIP, genetic epistasis with PARP-inhibitor resistance in BRCA1-deficient cells\",\n      \"pmids\": [\"25512557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which Artemis blocks resection not defined\", \"Reconciliation with Artemis pro-HR role in G2 incomplete\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Active-site analysis settled the long-standing question of activity origin, proving the 5'-exonuclease and endonuclease are intrinsic to Artemis and share one active site.\",\n      \"evidence\": \"Co-purification, H115A mutagenesis, cation dependence, parallel inhibitor sensitivity\",\n      \"pmids\": [\"24500713\", \"20117966\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for activity switching not yet defined here\", \"Substrate-selection determinants unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showing X4-LIV can stimulate Artemis at 3' overhangs independently of DNA-PKcs revealed alternative, sequential activation routes during NHEJ.\",\n      \"evidence\": \"In vitro reconstitution with defined substrates varying NHEJ components\",\n      \"pmids\": [\"28696258\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of DNA-PKcs-independent activation unclear\", \"Order of factor handoff not directly visualized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Recruitment to stalled replication forks established a replication-stress role, with Artemis cleaving forks to promote restart and prevent mitotic mis-segregation.\",\n      \"evidence\": \"siRNA knockdown, chromatin fractionation, DNA fiber and mitotic segregation assays; non-epistatic with XPF-ERCC1\",\n      \"pmids\": [\"30059501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Exact fork substrate cleaved by Artemis not defined\", \"Regulation distinct from NHEJ recruitment unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Crystal structures of the Artemis catalytic domain explained its endonuclease bias via a unique second metal site and showed the isolated domain is catalytically self-sufficient, enabling inhibitor development.\",\n      \"evidence\": \"X-ray crystallography of wildtype and variant catalytic domain, endonuclease assays, ebselen inhibition\",\n      \"pmids\": [\"34387696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show full-length autoinhibited architecture\", \"Substrate-bound catalytic state not captured\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM of the basal Artemis:DNA-PKcs complex visualized the pre-activation architecture and revealed mutually exclusive Artemis/XRCC4 binding on DNA-PKcs, explaining ordered NHEJ assembly.\",\n      \"evidence\": \"Cryo-EM of basal complex, XRCC4 peptide competition assays\",\n      \"pmids\": [\"35801871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Activated (post-autophosphorylation) state not resolved\", \"DNA-engaged cleavage-competent conformation undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single nuclease is allosterically switched between exo- and endonucleolytic modes and how its many regulatory partners (DNA-PKcs, LigIV, PTIP, Fbw7, DDB2, MRN) are temporally coordinated to dictate NHEJ-versus-HR pathway choice across cell-cycle phases.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the activated DNA-bound cleavage complex\", \"Mechanism integrating repair and checkpoint/ubiquitin-ligase functions unknown\", \"How resection-suppression and pro-HR roles are reconciled is unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [0, 4, 6, 18, 21]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 21]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 20, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [11, 25]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [0, 2, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 9, 31]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [13, 28, 29]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 10, 24]}\n    ],\n    \"complexes\": [\"Artemis:DNA-PKcs complex\", \"DNA-PK (Ku/DNA-PKcs/Artemis) chromatin complex\"],\n    \"partners\": [\"PRKDC\", \"LIG4\", \"XRCC4\", \"XRCC6\", \"PAXIP1\", \"FBXW7\", \"DDB2\", \"CDKN1B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}