{"gene":"KMT5A","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2002,"finding":"PR-Set7/SET8 (KMT5A) was purified and identified as the enzyme responsible for monomethylation of histone H4 at lysine 20 (H4K20me1). It is a single-subunit enzyme that prefers nucleosomal substrates. Disruption of SET8 in Drosophila reduces H4K20 methylation in vivo and results in lethality.","method":"Biochemical purification, in vitro methyltransferase assay, Drosophila genetic knockout","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical purification, in vitro enzymatic assay, and genetic loss-of-function in two independent papers (PMID:12086618 and PMID:12121615) independently purifying and characterizing the same enzyme","pmids":["12121615","12086618"],"is_preprint":false},{"year":2002,"finding":"H4 lysine 20 methylation and H4 lysine 16 acetylation are mutually antagonistic modifications: in vitro, methylation of K20 and acetylation of K16 on the H4 tail are competitive. The Drosophila male X chromosome, hyperacetylated at H4K16, shows significantly decreased H4K20 methylation.","method":"In vitro competition methylation/acetylation assay, polytene chromosome immunostaining","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro competition assay combined with cytological validation on polytene chromosomes","pmids":["12086618"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of human SET8 bound to a histone H4 peptide bearing Lys-20 and the product cofactor S-adenosylhomocysteine revealed the structural basis of substrate specificity. Residues preceding K20 engage in salt bridge, hydrogen bond, and van der Waals interactions; C-terminal residues bind through hydrophobic interactions. Mutational analysis confirmed that interactions with N- and C-terminal H4 residues are critical for substrate specificity. SET8 functions as a monomethylase.","method":"X-ray crystallography, site-directed mutagenesis, in vitro methyltransferase assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validation, independently reported in two concurrent structural papers (PMID:15933070 and PMID:15933069)","pmids":["15933070","15933069"],"is_preprint":false},{"year":2005,"finding":"NMR studies showed C-flanking domains of SET proteins become ordered upon addition of AdoMet cofactor. A histidine residue within the H4 substrate, close to target K20, is required for completion of the active site, explaining nucleosome specificity. The highly variable i-SET component is responsible for many substrate interactions.","method":"X-ray crystallography, NMR spectroscopy, in vitro methyltransferase assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure combined with NMR functional validation in a single rigorous study","pmids":["15933069"],"is_preprint":false},{"year":2005,"finding":"The minimal active SET domain of SET8 maps to amino acids 195-352. SET8 recognizes the specific sequence RHRK20VLRDN in the H4 N-terminus for monomethylation; individual mutation of any charged residue in this sequence abolished or greatly decreased methylation. Mass spectrometry confirmed SET8 selectively mono-methylates K20.","method":"Deletion mapping, alanine-scanning mutagenesis, in vitro methyltransferase assay, mass spectrometry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical methods (mutagenesis + MS) in a single study","pmids":["15964846"],"is_preprint":false},{"year":2007,"finding":"SET8 specifically monomethylates the tumor suppressor p53 at lysine 382 (p53K382me1). This methylation suppresses p53-mediated transcriptional activation of highly responsive target genes. Depletion of SET8 augments proapoptotic and checkpoint activation functions of p53.","method":"In vitro methyltransferase assay, RNAi knockdown, reporter gene assay, immunoprecipitation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro enzymatic assay identifying non-histone substrate, corroborated by RNAi functional studies","pmids":["17707234"],"is_preprint":false},{"year":2007,"finding":"SET8 depletion leads to decreased cell proliferation, accumulation in S phase, DNA double-strand break induction, and recruitment of DNA repair proteins (RPA, Rad51, 53BP1). SET8 interacts with PCNA through a conserved PIP motif. SET8 is required for DNA replication fork progression. SET8 deletion in mice causes embryonic lethality.","method":"siRNA knockdown, co-immunoprecipitation, DNA fiber assay, mouse genetic knockout","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying PCNA interaction, multiple functional readouts (replication fork, S-phase arrest, mouse KO lethality), replicated across studies","pmids":["18166648"],"is_preprint":false},{"year":2008,"finding":"SET8 monomethylates H4K20 during S phase by tethering to PCNA via a PIP box motif. The SET8-PCNA interaction couples H4K20 methylation with DNA replication.","method":"Co-immunoprecipitation, PIP-box mutant analysis, cell cycle synchronization experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct Co-IP of SET8-PCNA interaction confirmed by PIP-box mutagenesis, replicated across multiple studies","pmids":["18319261"],"is_preprint":false},{"year":2008,"finding":"PR-Set7 catalytic activity is essential for mitotic entry and genomic stability. Loss of PR-Set7 causes G2 arrest, global chromosome condensation failure, aberrant centrosome amplification, and DNA damage. A catalytically dead dominant-negative PR-Set7 mutant recapitulates these phenotypes, demonstrating the H4K20 monomethyltransferase activity is required independently of p53.","method":"RNAi knockdown, dominant-negative catalytic mutant, cell cycle analysis, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — dominant-negative catalytic mutant provides mechanistic specificity; multiple orthogonal phenotypic readouts","pmids":["18480059"],"is_preprint":false},{"year":2008,"finding":"PR-Set7 establishes a trans-tail histone code: H3K9 monomethylation depends on PR-Set7 but independently of its catalytic activity, indicating PR-Set7 recruits an H3K9 monomethyltransferase. This code involves L3MBTL1 binding monomethylated H4K20 to repress specific genes including RUNX1, regulating megakaryopoiesis.","method":"RNAi knockdown, ChIP, reporter assay, gene expression analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — catalytic mutant experiment separates enzymatic vs. scaffolding functions; ChIP and gene expression support pathway placement","pmids":["18474616"],"is_preprint":false},{"year":2010,"finding":"The L3MBTL1 chromatin compaction factor preferentially recognizes p53K382me1 (generated by SET8) through its triple MBT repeats, as demonstrated biochemically and crystallographically. SET8-mediated methylation promotes L3MBTL1-p53 interaction in cells and L3MBTL1 occupancy at p53 target promoters, repressing p53 target genes in the absence of DNA damage.","method":"Biochemical binding assay, X-ray crystallography (MBT-peptide), co-immunoprecipitation, ChIP","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of reader domain with methylated substrate, co-IP confirming cellular interaction, ChIP showing promoter occupancy","pmids":["20870725"],"is_preprint":false},{"year":2010,"finding":"PR-Set7 is degraded during S phase and in response to DNA damage by the CRL4(Cdt2) E3 ubiquitin ligase in a PCNA-dependent manner. A specialized 'PIP degron' in PR-Set7 mediates PCNA interaction and targets PR-Set7 for proteolysis on chromatin. A PR-Set7 mutant in the PIP degron accumulates during S phase. Skp2 also promotes PR-Set7 degradation outside the chromatin context. After DNA damage, PR-Set7 is transiently recruited to laser-induced damage sites via PCNA interaction, after which 53BP1 is recruited dependent on PR-Set7 catalytic activity.","method":"Protein stability assays, ubiquitination assay, PIP degron mutant, laser microirradiation/live imaging, siRNA knockdown","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (ubiquitination assay, mutant stabilization, live-cell imaging), replicated across three concurrent papers","pmids":["21035370","20932472","21220508"],"is_preprint":false},{"year":2010,"finding":"CRL4(Cdt2) targets Set8 for ubiquitylation and proteasomal degradation in S phase through a degron that binds PCNA. Inactivation of CRL4(Cdt2) leads to Set8 stabilization and aberrant H4K20me1 accumulation in replicating cells. Expression of a degron-mutant Set8 causes premature H4K20me1 accumulation, chromatin compaction, and checkpoint-mediated G2 arrest.","method":"Ubiquitylation assay, CRL4(Cdt2) inactivation, Set8 degron mutant overexpression, cell cycle analysis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct ubiquitylation assay combined with degron mutant phenotypic rescue; replicated across multiple concurrent studies","pmids":["20932472"],"is_preprint":false},{"year":2010,"finding":"PR-Set7 regulates replication origins: onset of replication licensing coincides with increased H4K20me1 at origins by PR-Set7. Tethering PR-Set7 to a genomic locus promotes pre-RC loading. PR-Set7 undergoes PCNA- and Cul4-Ddb1-dependent degradation during S phase, causing H4K20me1 loss at origins. A degradation-resistant PR-Set7 mutant causes re-replication.","method":"ChIP, artificial tethering assay, protein stability assay, BrdU incorporation/re-replication assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function tethering assay directly linking PR-Set7 methyltransferase activity to replication licensing, supported by degradation-resistant mutant phenotype","pmids":["20953199"],"is_preprint":false},{"year":2010,"finding":"PR-Set7 phosphorylation at Ser29 by CDK1/cyclinB during prophase through early anaphase removes PR-Set7 from mitotic chromosomes without affecting methyltransferase activity. S29 phosphorylation stabilizes PR-Set7 by inhibiting APC interaction. Dephosphorylation of S29 by Cdc14 phosphatases during late mitosis is required for APC(Cdh1)-mediated ubiquitination and proteolysis of PR-Set7.","method":"In vitro kinase assay, co-immunoprecipitation, phospho-specific antibody, dominant phospho-mutant analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro kinase assay, Co-IP for APC interaction, dominant mutant phenotype; multiple orthogonal methods in one study","pmids":["20966048"],"is_preprint":false},{"year":2011,"finding":"SET8 is physically associated with TWIST and promotes epithelial-mesenchymal transition (EMT) in breast cancer cells. SET8 acts as a dual epigenetic modifier on E-cadherin and N-cadherin promoters via H4K20 monomethylation activity. SET8 and TWIST are functionally interdependent for EMT and invasion.","method":"Co-immunoprecipitation, ChIP, RNAi knockdown, invasion assay, in vivo xenograft","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and functional assays in a single lab","pmids":["21983900"],"is_preprint":false},{"year":2012,"finding":"SETD8 methylates PCNA at lysine 248. This methylation stabilizes PCNA expression and significantly enhances the interaction between PCNA and the flap endonuclease FEN1. Loss of PCNA methylation retards Okazaki fragment maturation and slows DNA replication.","method":"In vitro methyltransferase assay, K248 mutant analysis, co-immunoprecipitation, Okazaki fragment assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzymatic assay identifying non-histone substrate, mutant substrate analysis, and functional consequence on Okazaki fragment maturation","pmids":["22556262"],"is_preprint":false},{"year":2012,"finding":"PR-Set7 role in replication licensing is dependent on Suv4-20h1/2 activity. Aberrant rereplication from PR-Set7 stabilization correlates with decreased H4K20me1 and increased H4K20me3. PR-Set7 tethering to an artificial locus recruits the ORC in a manner dependent on Suv4-20h and H4K20me3, consistent with ORC1 and ORCA/LRWD1 binding properties toward H4K20 methylation.","method":"Genetic epistasis (conditional mouse knockout), artificial tethering assay, ChIP, re-replication assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in mouse embryo combined with tethering assay and ChIP for ORC recruitment","pmids":["23152447"],"is_preprint":false},{"year":2012,"finding":"SET8 has a recognition sequence covering seven amino acids (R17-H18-R19/K/Y-K20-V/I/L/F/Y-L/F/Y-R23). Symmetric and asymmetric methylation on R17 inhibits SET8-mediated H4K20 methylation. Dimethylation of R at the -3 position also reduces p53 K382 methylation by SET8. SET8's long recognition sequence restricts methylation of lysines in folded protein regions.","method":"Peptide array methylation assay, Celluspots array, in vitro methyltransferase assay","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — systematic peptide array approach with biochemical validation, but single lab","pmids":["22583696"],"is_preprint":false},{"year":2013,"finding":"Set8 monomethylates Numb in its PTB domain. Methylation of Numb by Set8 uncouples Numb from p53, leading to increased p53 ubiquitination and degradation. Set8-mediated Numb methylation abolishes the apoptotic function of Numb. Doxorubicin-induced reduction of Set8 enhances Numb-p53 interaction and apoptosis.","method":"In vitro methyltransferase assay, co-immunoprecipitation, Numb methylation-site mutant, apoptosis assay, RNAi","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro enzymatic assay with non-histone substrate identification, mutant substrate analysis, and functional consequence on p53 stability","pmids":["23706821"],"is_preprint":false},{"year":2013,"finding":"CRL1-FBXO11 ubiquitylates and degrades Cdt2 (the substrate receptor for CRL4(Cdt2)), thereby stabilizing Set8. Stabilization of Set8 by CRL1(FBXO11)-mediated Cdt2 degradation turns off TGF-β-activated Smad2 signaling and promotes epithelial cell migration.","method":"Co-immunoprecipitation, ubiquitination assay, RNAi, cell migration assay","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay linking FBXO11-Cdt2-Set8 axis, with functional cellular readout","pmids":["23478445"],"is_preprint":false},{"year":2014,"finding":"SET8 acts directly at DNA double-strand breaks (DSBs) during the DNA damage response. SET8 accumulates at DSBs and is enzymatically active at DSBs. Depletion of SET8 abrogates 53BP1 accumulation at DSBs. SET8 occupancy at DSBs is regulated by HDACs. SET8 is functionally required for efficient DSB repair specifically via NHEJ.","method":"Laser microirradiation/ChIP-seq at DSBs, enzymatic activity assay at damage sites, HDAC inhibitor treatment, NHEJ reporter assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct measurement of SET8 activity at DSBs, NHEJ repair assay; single lab","pmids":["25252681"],"is_preprint":false},{"year":2014,"finding":"PR-Set7 directly binds the C-terminus of the Riz1/PRDM2/KMT8 tumor suppressor; the N-terminal PR/SET domain of Riz1 preferentially monomethylates H3K9. The PR-Set7 binding domain is required for Riz1 nuclear localization and maintenance of the H4K20me1-H3K9me1 trans-tail histone code.","method":"Co-immunoprecipitation, in vitro pulldown, in vitro methyltransferase assay, cell fractionation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding demonstrated by pulldown and Co-IP; functional consequence of interaction confirmed by nuclear localization data","pmids":["24423864"],"is_preprint":false},{"year":2014,"finding":"PR-SET7/SETD8 H4K20me1 controls RNA Pol II pausing dynamics. H4K20me1 is necessary for MSL complex recruitment and subsequent H4K16 acetylation, enabling Pol II release into active elongation. H4K20me1 is also required for H4K20me3 at paused genes.","method":"RNAi knockdown, ChIP, Pol II pausing analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple ChIP experiments placing SETD8/H4K20me1 in Pol II pausing pathway; single lab","pmids":["24459145"],"is_preprint":false},{"year":2015,"finding":"SCF(β-TRCP) promotes Set8 ubiquitination and degradation in a casein kinase I-dependent manner in response to DNA damage. Both CRL4(Cdt2) and SCF(β-TRCP) contribute to UV-induced Set8 degradation to control cell cycle progression and DNA damage checkpoints.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, kinase assay, Set8 mutant stability assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro ubiquitination assay, Co-IP, and kinase assay identifying a second E3 ligase for Set8","pmids":["26666832"],"is_preprint":false},{"year":2016,"finding":"Structural analysis of SETD8 using diverse X-ray structures (including covalent inhibitor-bound) and Markov state models from distributed MD simulations revealed that slow conformational motions of the enzyme are relevant to catalysis. A cysteine residue near the inhibitor binding site was identified for covalent modification, and a cocrystal structure of SETD8 with a small-molecule inhibitor was solved, providing the first atomic-level view of small-molecule inhibition.","method":"X-ray crystallography (multiple structures including inhibitor-bound), molecular dynamics simulation, Markov state modeling","journal":"Journal of medicinal chemistry / eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple crystal structures combined with computational conformational analysis","pmids":["27804297","31081496"],"is_preprint":false},{"year":2016,"finding":"Set8 uses multivalent interactions to bind the nucleosome: the i-SET and c-SET domains engage nucleosomal DNA 1-1.5 turns from the dyad, positioning the SET domain for H4K20 catalysis. A basic N-terminal extension makes an arginine anchor interaction with the H2A/H2B acidic patch. PCNA and the nucleosome compete for binding to Set8 through this N-terminal extension, providing a mechanism for how nucleosome binding protects Set8 from PCNA-dependent degradation.","method":"X-ray crystallography, solution binding studies, mutational analysis of Set8/nucleosome interface","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystallographic and solution structural data with mechanistic interpretation of competitive binding","pmids":["26953260"],"is_preprint":false},{"year":2016,"finding":"Kinetic isotope effect (KIE) measurements using MALDI-TOF MS revealed that SET8-catalyzed H4K20 monomethylation proceeds through an early, asymmetrical SN2 transition state with C-N and C-S distances of 2.35-2.40 Å and 2.00-2.05 Å, respectively.","method":"MALDI-TOF mass spectrometry-based KIE measurement, QM/MM computational modeling, kinetic isotope effect analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous kinetic isotope effect experiment with computational validation defining the catalytic mechanism","pmids":["27940912"],"is_preprint":false},{"year":2019,"finding":"SET8 methylates UHRF1 at lysine 385, leading to ubiquitin-dependent degradation of UHRF1. LSD1 demethylates and stabilizes UHRF1. SET8 and LSD1 oppositely regulate global DNA methylation, primarily through controlling UHRF1 levels. UHRF1 downregulation in G2/M by SET8 suppresses DNMT1-mediated methylation on post-replicated DNA.","method":"In vitro methyltransferase assay, co-immunoprecipitation, ubiquitination assay, UHRF1 methylation-site mutant, bisulfite sequencing","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro methylation of non-histone substrate UHRF1, identification of specific methylation site, functional consequence on global DNA methylation","pmids":["31400111"],"is_preprint":false},{"year":2019,"finding":"USP17 deubiquitinates and stabilizes the SET8 protein. USP17 interacts with SET8 and removes polyubiquitin chains from SET8. USP17 knockdown decreases SET8 protein levels and H4K20 monomethylation, increases p21 levels, and suppresses cell proliferation, triggering cellular senescence.","method":"Co-immunoprecipitation, in vitro deubiquitination assay, RNAi knockdown, cell proliferation/senescence assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and in vitro deubiquitination assay identifying first deubiquitinase of SET8, with functional cellular consequence","pmids":["31533987"],"is_preprint":false},{"year":2020,"finding":"KMT5A/SET8 methylates α-tubulin at lysine 311. The transcription factor LSF/CP2 binds both α-tubulin and SET8 and enhances SET8-mediated α-tubulin methylation in vitro. The LSF inhibitor FQI1 counters LSF-facilitated tubulin methylation.","method":"In vitro radiolabeling, mass spectrometry, co-immunoprecipitation, immunofluorescence, pulldown assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro methyltransferase assay with MS identification of methylation site, Co-IP for protein interaction; single lab","pmids":["32111740"],"is_preprint":false},{"year":2022,"finding":"KMT5A monomethylates SNIP1 at K301. This methylation releases histone acetyltransferase KAT2A and promotes the interaction of c-MYC and KAT2A, leading to recruitment of the c-MYC/KAT2A complex to c-MYC target promoters. This inhibits the Hippo kinase cascade and transcriptionally activates MARK4, enhancing TNBC metastasis.","method":"In vitro methyltransferase assay, Co-immunoprecipitation, ChIP, SNIP1 K301 mutant analysis, in vivo xenograft","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and K301 mutant analysis; single lab with multiple orthogonal methods","pmids":["35449131"],"is_preprint":false},{"year":2017,"finding":"SETD8 ablation in neuroblastoma rescues p53 pro-apoptotic and cell-cycle arrest functions by decreasing p53K382me1, activating the p53 canonical pathway. Pharmacological inhibition with UNC0379 conferred survival advantage in xenograft NB models.","method":"RNAi screen, chemical screen, p53K382me1 immunoblot, xenograft model","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional screen with mechanistic validation of p53 methylation status; single lab","pmids":["28073004"],"is_preprint":false},{"year":2023,"finding":"PR-SET7 deficiency in trophoblasts derepresses endogenous retroviruses (ERVs), causing double-stranded RNA stress and viral mimicry response that drives interferon response and necroptosis. H4K20me1 and H4K20me3 mediate suppression of ERV expression in trophoblasts. PR-SET7 deficiency in mice leads to defective trophoblasts and early embryonic loss.","method":"Conditional mouse knockout, RNA-seq, ChIP, interferon signaling assays, necroptosis assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with mechanistic ChIP and transcriptomic analysis; single study","pmids":["37307441"],"is_preprint":false},{"year":2008,"finding":"QM/MM computational analysis of SET8 catalysis revealed that the methylation reaction requires prior deprotonation of the target lysine, and that product specificity (monomethylation) results from a methyl substituent on the product blocking formation of a water channel required for subsequent deprotonation, preventing a second methylation.","method":"QM/MM molecular dynamics simulation, kinetic analysis","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 (computational) / Moderate — QM/MM with agreement between computed and experimental free energy barriers; mechanism is computationally derived","pmids":["18512960"],"is_preprint":false},{"year":2013,"finding":"MBTD1 associates with Pr-Set7 in mouse oocytes (demonstrated by co-IP). MBTD1 depletion reduces Pr-Set7 expression and H4K20me1 levels, causes DNA damage, and recapitulates phenotypes of Pr-Set7 depletion in oocyte meiotic maturation.","method":"Co-immunoprecipitation, RNAi knockdown, immunofluorescence","journal":"Cell cycle","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP in oocytes; indirect evidence for complex; single lab","pmids":["23475131"],"is_preprint":false},{"year":2020,"finding":"STRA8 and SETD8 interact (yeast two-hybrid, confirmed by co-IP); SETD8 negatively regulates STRA8 promoter transcriptional activity. STRA8 increases SETD8 promoter activity in a dose-dependent manner. Both show cell cycle-dependent expression in germline cells, co-localizing with PCNA in spermatogonia.","method":"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay, immunofluorescence","journal":"Journal of cellular and molecular medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid and Co-IP interaction; single lab, limited mechanistic follow-up","pmids":["32090428"],"is_preprint":false},{"year":2015,"finding":"SetD8 is a context-dependent GATA-1 corepressor in erythroid cells. SetD8 catalyzes H4K20me1 at a critical Gata2 cis-element and restricts Scl/TAL1 occupancy at the Gata2 enhancer, thereby repressing Gata2 transcription. Loss of SetD8 impairs erythroblast maturation and survival.","method":"shRNA knockdown, ChIP, erythroblast maturation assay, co-immunoprecipitation","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP directly linking SetD8/H4K20me1 to Gata2 regulatory element occupancy and transcription; functional rescue experiment","pmids":["25855754"],"is_preprint":false},{"year":2020,"finding":"SETD8 interacts with STAT3 and is recruited by STAT3 to the DUSP10 promoter, epigenetically silencing DUSP10 expression via H4K20me1. Decreased DUSP10 (an ERK1/2 phosphatase) potentiates constitutive ERK1/2 activation in pancreatic cancer.","method":"Mass spectrometry, co-immunoprecipitation, ChIP, luciferase reporter assay, RNAi","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ChIP identifying STAT3-SETD8 co-occupancy at DUSP10 promoter; single lab","pmids":["33232789"],"is_preprint":false}],"current_model":"KMT5A (SET8/PR-Set7/SETD8) is the sole mammalian enzyme that monomethylates histone H4 at lysine 20 (H4K20me1), acting via an SN2 mechanism requiring prior lysine deprotonation through a water channel; it also monomethylates non-histone substrates including p53 (K382), PCNA (K248), UHRF1 (K385), Numb, SNIP1 (K301), and α-tubulin (K311). Its protein levels are tightly regulated through the cell cycle by multiple ubiquitin E3 ligases (CRL4(Cdt2), SCF(β-TRCP), APC(Cdh1)) and stabilized by the deubiquitinase USP17; CDK1-mediated phosphorylation at S29 during mitosis removes it from chromosomes and protects it from APC. H4K20me1 established by KMT5A promotes replication origin licensing (via downstream Suv4-20h-mediated H4K20me3 and ORC1/ORCA recruitment), mitotic chromatin compaction, DNA damage response (53BP1 recruitment via NHEJ), and transcriptional repression through the L3MBTL1 reader; loss of KMT5A causes S-phase defects, re-replication, chromosome condensation failure, and embryonic lethality in mice."},"narrative":{"mechanistic_narrative":"KMT5A (SET8/PR-Set7/SETD8) is the sole mammalian enzyme that monomethylates histone H4 at lysine 20 (H4K20me1), a single-subunit methyltransferase that prefers nucleosomal substrate and whose loss is lethal in Drosophila and mice [PMID:12121615, PMID:12086618, PMID:18166648]. Crystallographic, NMR, peptide-array, kinetic-isotope, and QM/MM studies define a long, sequence-specific recognition motif around H4K20 (RHRK20VLRDN) and an SN2 catalytic mechanism that requires prior lysine deprotonation through a water channel; the methyl group installed on the product blocks channel reformation, enforcing strict monomethylation [PMID:15933070, PMID:15933069, PMID:15964846, PMID:22583696, PMID:27940912, PMID:18512960]. SET8 docks onto the nucleosome through multivalent i-SET/c-SET contacts with DNA and an arginine-anchor interaction with the H2A/H2B acidic patch, and PCNA competes with the nucleosome for the same N-terminal extension, coupling its enzymatic engagement to the replication context [PMID:26953260]. Beyond histones, SET8 monomethylates a panel of non-histone substrates with defined functional consequences: p53 at K382 to dampen p53 transcriptional and apoptotic output through the L3MBTL1 reader [PMID:17707234, PMID:20870725, PMID:28073004], PCNA at K248 to promote FEN1 binding and Okazaki fragment maturation [PMID:22556262], UHRF1 at K385 to trigger its degradation and limit DNMT1-dependent DNA methylation [PMID:31400111], Numb to release p53 for degradation [PMID:23706821], SNIP1 at K301 [PMID:35449131], and α-tubulin at K311 [PMID:32111740]. H4K20me1 deposited by SET8 licenses replication origins via downstream Suv4-20h-mediated H4K20me3 and ORC recruitment, drives mitotic chromatin compaction, supports 53BP1 recruitment and NHEJ-mediated double-strand break repair, and enforces transcriptional repression through readers including L3MBTL1 [PMID:20953199, PMID:23152447, PMID:18480059, PMID:25252681, PMID:18474616]; accordingly SET8 loss causes S-phase accumulation, re-replication, chromosome condensation failure, DNA damage, and embryonic lethality [PMID:18166648, PMID:18480059, PMID:20953199]. SET8 protein abundance is gated through the cell cycle by multiple ubiquitin E3 ligases—CRL4(Cdt2) acting through a PCNA-binding PIP degron during S phase and after damage, SCF(β-TRCP) after UV damage, and APC(Cdh1) in late mitosis—counterbalanced by the deubiquitinase USP17, while CDK1/cyclinB phosphorylation at Ser29 removes it from mitotic chromosomes and shields it from APC until Cdc14 dephosphorylation [PMID:21035370, PMID:20932472, PMID:21220508, PMID:26666832, PMID:20966048, PMID:31533987].","teleology":[{"year":2002,"claim":"Established the identity and core activity of the enzyme: it answered which protein deposits H4K20 methylation and whether it is essential.","evidence":"Biochemical purification, in vitro methyltransferase assay, and Drosophila genetic knockout, plus an in vitro competition assay showing H4K20 methylation and H4K16 acetylation are mutually antagonistic","pmids":["12121615","12086618"],"confidence":"High","gaps":["Catalytic mechanism and structural basis of specificity not yet defined","Non-histone substrates unknown at this stage"]},{"year":2005,"claim":"Defined the structural and sequence basis for substrate recognition and why the enzyme is a strict monomethylase, answering how specificity is achieved.","evidence":"X-ray crystallography of SET8–H4 peptide–SAH complexes, NMR, deletion mapping (residues 195–352), and alanine-scanning of the RHRK20VLRDN motif","pmids":["15933070","15933069","15964846"],"confidence":"High","gaps":["Nucleosome-level engagement not resolved by peptide structures","Catalytic transition-state geometry not yet measured"]},{"year":2007,"claim":"Extended the enzyme from a histone writer to a regulator of p53 and DNA replication, answering whether it has non-histone substrates and a replication role.","evidence":"In vitro methylation identifying p53 K382, RNAi/reporter assays, PCNA Co-IP via a PIP motif, DNA fiber assays, and mouse knockout","pmids":["17707234","18166648"],"confidence":"High","gaps":["Mechanism coupling H4K20me1 to replication licensing not yet defined","Whether replication phenotype is p53-independent unresolved"]},{"year":2008,"claim":"Separated the enzyme's catalytic from scaffolding functions and tied catalysis to mitosis and a trans-tail code, while defining how PCNA couples methylation to S phase.","evidence":"Dominant-negative catalytic mutant cell-cycle analysis, PIP-box mutant PCNA tethering, ChIP/reporter assays for the H4K20me1–L3MBTL1–H3K9me1 axis, and QM/MM mechanism modeling","pmids":["18480059","18319261","18474616","18512960"],"confidence":"High","gaps":["Identity of the recruited H3K9 monomethyltransferase not established here","QM/MM mechanism is computationally derived"]},{"year":2010,"claim":"Resolved how the enzyme is degraded and how its product feeds origin licensing and chromatin compaction, answering how its activity is temporally restricted.","evidence":"Ubiquitylation assays and degron/phospho-mutant stability analyses (CRL4(Cdt2), Skp2, APC(Cdh1), CDK1-S29), laser microirradiation for damage recruitment, tethering/ChIP for origin licensing, and crystallography of L3MBTL1 reading p53K382me1","pmids":["21035370","20932472","21220508","20953199","20966048","20870725"],"confidence":"High","gaps":["Quantitative contribution of each E3 ligase across cell-cycle states not delineated","Reader landscape for H4K20me1 beyond L3MBTL1 incomplete"]},{"year":2012,"claim":"Connected H4K20me1 to the downstream H4K20me3/ORC origin pathway and added PCNA K248 methylation, refining how the enzyme supports replication fidelity.","evidence":"Conditional mouse knockout epistasis with Suv4-20h, tethering/ChIP for ORC recruitment, peptide-array motif mapping, and in vitro PCNA K248 methylation with Okazaki fragment assays","pmids":["23152447","22583696","22556262"],"confidence":"High","gaps":["Direct ORC1/ORCA binding to H4K20me3 inferred rather than reconstituted here","Generality of K248 methylation across replication contexts unclear"]},{"year":2014,"claim":"Defined direct action at double-strand breaks and additional non-histone substrates/partners, answering how the enzyme participates in repair and apoptosis control.","evidence":"Enzymatic activity measurement at laser-induced DSBs with NHEJ reporter, Numb methylation Co-IP/apoptosis assays, and Riz1/PRDM2 pulldown/localization studies","pmids":["25252681","23706821","24423864"],"confidence":"Medium","gaps":["DSB role from a single lab without reciprocal validation","Numb and Riz1 interactions not reconstituted structurally"]},{"year":2019,"claim":"Identified UHRF1 K385 methylation linking SET8 to global DNA methylation and the first stabilizing deubiquitinase, expanding the regulatory and substrate network.","evidence":"In vitro UHRF1 methylation with site mutant and bisulfite sequencing; USP17 Co-IP and in vitro deubiquitination with senescence assays","pmids":["31400111","31533987"],"confidence":"Medium","gaps":["USP17 evidence from a single study","In vivo significance of UHRF1 methylation for genomic methylation patterns incompletely mapped"]},{"year":2023,"claim":"Placed H4K20 methylation in developmental ERV silencing, answering one mechanism for the embryonic lethality of SET8 loss.","evidence":"Conditional mouse knockout in trophoblasts with RNA-seq, ChIP, interferon and necroptosis assays","pmids":["37307441"],"confidence":"Medium","gaps":["Single-study mechanism","Direct H4K20 methylation at specific ERV loci versus indirect effects not fully separated"]},{"year":null,"claim":"How the diverse non-histone substrate methylations and tissue-specific transcriptional roles are coordinated with cell-cycle-gated SET8 abundance to produce context-specific outcomes remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified model integrating histone vs non-histone substrate choice","Tissue-specific corepressor partnerships (GATA-1, STAT3, TWIST) lack shared mechanistic framework","Substrate selection determinants in vivo undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,4,5,16,19,28,30,31]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5,16,19,28,30,31]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[0,2,26]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[5,9,37,38]}],"localization":[{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,7,13,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5,22,28]}],"pathway":[{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[6,7,13,16]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[8,11,12,14]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,21,24]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,9,23]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[5,10,37,38]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[13,17]}],"complexes":[],"partners":["PCNA","TP53","L3MBTL1","UHRF1","TWIST1","PRDM2","STAT3","SNIP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NQR1","full_name":"N-lysine methyltransferase KMT5A","aliases":["H4-K20-HMTase KMT5A","Histone-lysine N-methyltransferase KMT5A","Lysine N-methyltransferase 5A","Lysine-specific methylase 5A","PR/SET domain-containing protein 07","PR-Set7","PR/SET07","SET domain-containing protein 8"],"length_aa":393,"mass_kda":42.9,"function":"Protein-lysine N-methyltransferase that monomethylates both histones and non-histone proteins (PubMed:12086618, PubMed:12121615, PubMed:15964846, PubMed:17707234, PubMed:27338793). Specifically monomethylates 'Lys-20' of histone H4 (H4K20me1) (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599, PubMed:27338793). H4K20me1 is enriched during mitosis and represents a specific tag for epigenetic transcriptional repression (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599). Mainly functions in euchromatin regions, thereby playing a central role in the silencing of euchromatic genes (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599). Required for cell proliferation, probably by contributing to the maintenance of proper higher-order structure of DNA during mitosis (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599). Involved in chromosome condensation and proper cytokinesis (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599). Nucleosomes are preferred as substrate compared to free histones (PubMed:12086618, PubMed:12121615, PubMed:15200950, PubMed:15933069, PubMed:15933070, PubMed:15964846, PubMed:16517599). Mediates monomethylation of p53/TP53 at 'Lys-382', leading to repress p53/TP53-target genes (PubMed:17707234). Plays a negative role in TGF-beta response regulation and a positive role in cell migration (PubMed:23478445)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/Q9NQR1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/KMT5A","classification":"Common Essential","n_dependent_lines":655,"n_total_lines":1208,"dependency_fraction":0.5422185430463576},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KMT5A","total_profiled":1310},"omim":[{"mim_id":"611095","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL RECESSIVE 9; MRT9","url":"https://www.omim.org/entry/611095"},{"mim_id":"607240","title":"LYSINE METHYLTRANSFERASE 5A; KMT5A","url":"https://www.omim.org/entry/607240"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/KMT5A"},"hgnc":{"alias_symbol":["SET8","SET07","PR-Set7"],"prev_symbol":["SETD8"]},"alphafold":{"accession":"Q9NQR1","domains":[{"cath_id":"2.170.270.10","chopping":"259-389","consensus_level":"high","plddt":96.4695,"start":259,"end":389}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQR1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQR1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NQR1-F1-predicted_aligned_error_v6.png","plddt_mean":64.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KMT5A","jax_strain_url":"https://www.jax.org/strain/search?query=KMT5A"},"sequence":{"accession":"Q9NQR1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NQR1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NQR1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NQR1"}},"corpus_meta":[{"pmid":"12086618","id":"PMC_12086618","title":"PR-Set7 is 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It is a single-subunit enzyme that prefers nucleosomal substrates. Disruption of SET8 in Drosophila reduces H4K20 methylation in vivo and results in lethality.\",\n      \"method\": \"Biochemical purification, in vitro methyltransferase assay, Drosophila genetic knockout\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical purification, in vitro enzymatic assay, and genetic loss-of-function in two independent papers (PMID:12086618 and PMID:12121615) independently purifying and characterizing the same enzyme\",\n      \"pmids\": [\"12121615\", \"12086618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"H4 lysine 20 methylation and H4 lysine 16 acetylation are mutually antagonistic modifications: in vitro, methylation of K20 and acetylation of K16 on the H4 tail are competitive. The Drosophila male X chromosome, hyperacetylated at H4K16, shows significantly decreased H4K20 methylation.\",\n      \"method\": \"In vitro competition methylation/acetylation assay, polytene chromosome immunostaining\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro competition assay combined with cytological validation on polytene chromosomes\",\n      \"pmids\": [\"12086618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of human SET8 bound to a histone H4 peptide bearing Lys-20 and the product cofactor S-adenosylhomocysteine revealed the structural basis of substrate specificity. Residues preceding K20 engage in salt bridge, hydrogen bond, and van der Waals interactions; C-terminal residues bind through hydrophobic interactions. Mutational analysis confirmed that interactions with N- and C-terminal H4 residues are critical for substrate specificity. SET8 functions as a monomethylase.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, in vitro methyltransferase assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validation, independently reported in two concurrent structural papers (PMID:15933070 and PMID:15933069)\",\n      \"pmids\": [\"15933070\", \"15933069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NMR studies showed C-flanking domains of SET proteins become ordered upon addition of AdoMet cofactor. A histidine residue within the H4 substrate, close to target K20, is required for completion of the active site, explaining nucleosome specificity. The highly variable i-SET component is responsible for many substrate interactions.\",\n      \"method\": \"X-ray crystallography, NMR spectroscopy, in vitro methyltransferase assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with NMR functional validation in a single rigorous study\",\n      \"pmids\": [\"15933069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The minimal active SET domain of SET8 maps to amino acids 195-352. SET8 recognizes the specific sequence RHRK20VLRDN in the H4 N-terminus for monomethylation; individual mutation of any charged residue in this sequence abolished or greatly decreased methylation. Mass spectrometry confirmed SET8 selectively mono-methylates K20.\",\n      \"method\": \"Deletion mapping, alanine-scanning mutagenesis, in vitro methyltransferase assay, mass spectrometry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical methods (mutagenesis + MS) in a single study\",\n      \"pmids\": [\"15964846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SET8 specifically monomethylates the tumor suppressor p53 at lysine 382 (p53K382me1). This methylation suppresses p53-mediated transcriptional activation of highly responsive target genes. Depletion of SET8 augments proapoptotic and checkpoint activation functions of p53.\",\n      \"method\": \"In vitro methyltransferase assay, RNAi knockdown, reporter gene assay, immunoprecipitation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro enzymatic assay identifying non-histone substrate, corroborated by RNAi functional studies\",\n      \"pmids\": [\"17707234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SET8 depletion leads to decreased cell proliferation, accumulation in S phase, DNA double-strand break induction, and recruitment of DNA repair proteins (RPA, Rad51, 53BP1). SET8 interacts with PCNA through a conserved PIP motif. SET8 is required for DNA replication fork progression. SET8 deletion in mice causes embryonic lethality.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, DNA fiber assay, mouse genetic knockout\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying PCNA interaction, multiple functional readouts (replication fork, S-phase arrest, mouse KO lethality), replicated across studies\",\n      \"pmids\": [\"18166648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SET8 monomethylates H4K20 during S phase by tethering to PCNA via a PIP box motif. The SET8-PCNA interaction couples H4K20 methylation with DNA replication.\",\n      \"method\": \"Co-immunoprecipitation, PIP-box mutant analysis, cell cycle synchronization experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct Co-IP of SET8-PCNA interaction confirmed by PIP-box mutagenesis, replicated across multiple studies\",\n      \"pmids\": [\"18319261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PR-Set7 catalytic activity is essential for mitotic entry and genomic stability. Loss of PR-Set7 causes G2 arrest, global chromosome condensation failure, aberrant centrosome amplification, and DNA damage. A catalytically dead dominant-negative PR-Set7 mutant recapitulates these phenotypes, demonstrating the H4K20 monomethyltransferase activity is required independently of p53.\",\n      \"method\": \"RNAi knockdown, dominant-negative catalytic mutant, cell cycle analysis, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative catalytic mutant provides mechanistic specificity; multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"18480059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PR-Set7 establishes a trans-tail histone code: H3K9 monomethylation depends on PR-Set7 but independently of its catalytic activity, indicating PR-Set7 recruits an H3K9 monomethyltransferase. This code involves L3MBTL1 binding monomethylated H4K20 to repress specific genes including RUNX1, regulating megakaryopoiesis.\",\n      \"method\": \"RNAi knockdown, ChIP, reporter assay, gene expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic mutant experiment separates enzymatic vs. scaffolding functions; ChIP and gene expression support pathway placement\",\n      \"pmids\": [\"18474616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The L3MBTL1 chromatin compaction factor preferentially recognizes p53K382me1 (generated by SET8) through its triple MBT repeats, as demonstrated biochemically and crystallographically. SET8-mediated methylation promotes L3MBTL1-p53 interaction in cells and L3MBTL1 occupancy at p53 target promoters, repressing p53 target genes in the absence of DNA damage.\",\n      \"method\": \"Biochemical binding assay, X-ray crystallography (MBT-peptide), co-immunoprecipitation, ChIP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of reader domain with methylated substrate, co-IP confirming cellular interaction, ChIP showing promoter occupancy\",\n      \"pmids\": [\"20870725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PR-Set7 is degraded during S phase and in response to DNA damage by the CRL4(Cdt2) E3 ubiquitin ligase in a PCNA-dependent manner. A specialized 'PIP degron' in PR-Set7 mediates PCNA interaction and targets PR-Set7 for proteolysis on chromatin. A PR-Set7 mutant in the PIP degron accumulates during S phase. Skp2 also promotes PR-Set7 degradation outside the chromatin context. After DNA damage, PR-Set7 is transiently recruited to laser-induced damage sites via PCNA interaction, after which 53BP1 is recruited dependent on PR-Set7 catalytic activity.\",\n      \"method\": \"Protein stability assays, ubiquitination assay, PIP degron mutant, laser microirradiation/live imaging, siRNA knockdown\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (ubiquitination assay, mutant stabilization, live-cell imaging), replicated across three concurrent papers\",\n      \"pmids\": [\"21035370\", \"20932472\", \"21220508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRL4(Cdt2) targets Set8 for ubiquitylation and proteasomal degradation in S phase through a degron that binds PCNA. Inactivation of CRL4(Cdt2) leads to Set8 stabilization and aberrant H4K20me1 accumulation in replicating cells. Expression of a degron-mutant Set8 causes premature H4K20me1 accumulation, chromatin compaction, and checkpoint-mediated G2 arrest.\",\n      \"method\": \"Ubiquitylation assay, CRL4(Cdt2) inactivation, Set8 degron mutant overexpression, cell cycle analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct ubiquitylation assay combined with degron mutant phenotypic rescue; replicated across multiple concurrent studies\",\n      \"pmids\": [\"20932472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PR-Set7 regulates replication origins: onset of replication licensing coincides with increased H4K20me1 at origins by PR-Set7. Tethering PR-Set7 to a genomic locus promotes pre-RC loading. PR-Set7 undergoes PCNA- and Cul4-Ddb1-dependent degradation during S phase, causing H4K20me1 loss at origins. A degradation-resistant PR-Set7 mutant causes re-replication.\",\n      \"method\": \"ChIP, artificial tethering assay, protein stability assay, BrdU incorporation/re-replication assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function tethering assay directly linking PR-Set7 methyltransferase activity to replication licensing, supported by degradation-resistant mutant phenotype\",\n      \"pmids\": [\"20953199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PR-Set7 phosphorylation at Ser29 by CDK1/cyclinB during prophase through early anaphase removes PR-Set7 from mitotic chromosomes without affecting methyltransferase activity. S29 phosphorylation stabilizes PR-Set7 by inhibiting APC interaction. Dephosphorylation of S29 by Cdc14 phosphatases during late mitosis is required for APC(Cdh1)-mediated ubiquitination and proteolysis of PR-Set7.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, phospho-specific antibody, dominant phospho-mutant analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro kinase assay, Co-IP for APC interaction, dominant mutant phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"20966048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SET8 is physically associated with TWIST and promotes epithelial-mesenchymal transition (EMT) in breast cancer cells. SET8 acts as a dual epigenetic modifier on E-cadherin and N-cadherin promoters via H4K20 monomethylation activity. SET8 and TWIST are functionally interdependent for EMT and invasion.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, RNAi knockdown, invasion assay, in vivo xenograft\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ChIP, and functional assays in a single lab\",\n      \"pmids\": [\"21983900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SETD8 methylates PCNA at lysine 248. This methylation stabilizes PCNA expression and significantly enhances the interaction between PCNA and the flap endonuclease FEN1. Loss of PCNA methylation retards Okazaki fragment maturation and slows DNA replication.\",\n      \"method\": \"In vitro methyltransferase assay, K248 mutant analysis, co-immunoprecipitation, Okazaki fragment assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzymatic assay identifying non-histone substrate, mutant substrate analysis, and functional consequence on Okazaki fragment maturation\",\n      \"pmids\": [\"22556262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PR-Set7 role in replication licensing is dependent on Suv4-20h1/2 activity. Aberrant rereplication from PR-Set7 stabilization correlates with decreased H4K20me1 and increased H4K20me3. PR-Set7 tethering to an artificial locus recruits the ORC in a manner dependent on Suv4-20h and H4K20me3, consistent with ORC1 and ORCA/LRWD1 binding properties toward H4K20 methylation.\",\n      \"method\": \"Genetic epistasis (conditional mouse knockout), artificial tethering assay, ChIP, re-replication assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in mouse embryo combined with tethering assay and ChIP for ORC recruitment\",\n      \"pmids\": [\"23152447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SET8 has a recognition sequence covering seven amino acids (R17-H18-R19/K/Y-K20-V/I/L/F/Y-L/F/Y-R23). Symmetric and asymmetric methylation on R17 inhibits SET8-mediated H4K20 methylation. Dimethylation of R at the -3 position also reduces p53 K382 methylation by SET8. SET8's long recognition sequence restricts methylation of lysines in folded protein regions.\",\n      \"method\": \"Peptide array methylation assay, Celluspots array, in vitro methyltransferase assay\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic peptide array approach with biochemical validation, but single lab\",\n      \"pmids\": [\"22583696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Set8 monomethylates Numb in its PTB domain. Methylation of Numb by Set8 uncouples Numb from p53, leading to increased p53 ubiquitination and degradation. Set8-mediated Numb methylation abolishes the apoptotic function of Numb. Doxorubicin-induced reduction of Set8 enhances Numb-p53 interaction and apoptosis.\",\n      \"method\": \"In vitro methyltransferase assay, co-immunoprecipitation, Numb methylation-site mutant, apoptosis assay, RNAi\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro enzymatic assay with non-histone substrate identification, mutant substrate analysis, and functional consequence on p53 stability\",\n      \"pmids\": [\"23706821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRL1-FBXO11 ubiquitylates and degrades Cdt2 (the substrate receptor for CRL4(Cdt2)), thereby stabilizing Set8. Stabilization of Set8 by CRL1(FBXO11)-mediated Cdt2 degradation turns off TGF-β-activated Smad2 signaling and promotes epithelial cell migration.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNAi, cell migration assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay linking FBXO11-Cdt2-Set8 axis, with functional cellular readout\",\n      \"pmids\": [\"23478445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SET8 acts directly at DNA double-strand breaks (DSBs) during the DNA damage response. SET8 accumulates at DSBs and is enzymatically active at DSBs. Depletion of SET8 abrogates 53BP1 accumulation at DSBs. SET8 occupancy at DSBs is regulated by HDACs. SET8 is functionally required for efficient DSB repair specifically via NHEJ.\",\n      \"method\": \"Laser microirradiation/ChIP-seq at DSBs, enzymatic activity assay at damage sites, HDAC inhibitor treatment, NHEJ reporter assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct measurement of SET8 activity at DSBs, NHEJ repair assay; single lab\",\n      \"pmids\": [\"25252681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PR-Set7 directly binds the C-terminus of the Riz1/PRDM2/KMT8 tumor suppressor; the N-terminal PR/SET domain of Riz1 preferentially monomethylates H3K9. The PR-Set7 binding domain is required for Riz1 nuclear localization and maintenance of the H4K20me1-H3K9me1 trans-tail histone code.\",\n      \"method\": \"Co-immunoprecipitation, in vitro pulldown, in vitro methyltransferase assay, cell fractionation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding demonstrated by pulldown and Co-IP; functional consequence of interaction confirmed by nuclear localization data\",\n      \"pmids\": [\"24423864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PR-SET7/SETD8 H4K20me1 controls RNA Pol II pausing dynamics. H4K20me1 is necessary for MSL complex recruitment and subsequent H4K16 acetylation, enabling Pol II release into active elongation. H4K20me1 is also required for H4K20me3 at paused genes.\",\n      \"method\": \"RNAi knockdown, ChIP, Pol II pausing analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple ChIP experiments placing SETD8/H4K20me1 in Pol II pausing pathway; single lab\",\n      \"pmids\": [\"24459145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SCF(β-TRCP) promotes Set8 ubiquitination and degradation in a casein kinase I-dependent manner in response to DNA damage. Both CRL4(Cdt2) and SCF(β-TRCP) contribute to UV-induced Set8 degradation to control cell cycle progression and DNA damage checkpoints.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, kinase assay, Set8 mutant stability assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro ubiquitination assay, Co-IP, and kinase assay identifying a second E3 ligase for Set8\",\n      \"pmids\": [\"26666832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Structural analysis of SETD8 using diverse X-ray structures (including covalent inhibitor-bound) and Markov state models from distributed MD simulations revealed that slow conformational motions of the enzyme are relevant to catalysis. A cysteine residue near the inhibitor binding site was identified for covalent modification, and a cocrystal structure of SETD8 with a small-molecule inhibitor was solved, providing the first atomic-level view of small-molecule inhibition.\",\n      \"method\": \"X-ray crystallography (multiple structures including inhibitor-bound), molecular dynamics simulation, Markov state modeling\",\n      \"journal\": \"Journal of medicinal chemistry / eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple crystal structures combined with computational conformational analysis\",\n      \"pmids\": [\"27804297\", \"31081496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Set8 uses multivalent interactions to bind the nucleosome: the i-SET and c-SET domains engage nucleosomal DNA 1-1.5 turns from the dyad, positioning the SET domain for H4K20 catalysis. A basic N-terminal extension makes an arginine anchor interaction with the H2A/H2B acidic patch. PCNA and the nucleosome compete for binding to Set8 through this N-terminal extension, providing a mechanism for how nucleosome binding protects Set8 from PCNA-dependent degradation.\",\n      \"method\": \"X-ray crystallography, solution binding studies, mutational analysis of Set8/nucleosome interface\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystallographic and solution structural data with mechanistic interpretation of competitive binding\",\n      \"pmids\": [\"26953260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Kinetic isotope effect (KIE) measurements using MALDI-TOF MS revealed that SET8-catalyzed H4K20 monomethylation proceeds through an early, asymmetrical SN2 transition state with C-N and C-S distances of 2.35-2.40 Å and 2.00-2.05 Å, respectively.\",\n      \"method\": \"MALDI-TOF mass spectrometry-based KIE measurement, QM/MM computational modeling, kinetic isotope effect analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous kinetic isotope effect experiment with computational validation defining the catalytic mechanism\",\n      \"pmids\": [\"27940912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SET8 methylates UHRF1 at lysine 385, leading to ubiquitin-dependent degradation of UHRF1. LSD1 demethylates and stabilizes UHRF1. SET8 and LSD1 oppositely regulate global DNA methylation, primarily through controlling UHRF1 levels. UHRF1 downregulation in G2/M by SET8 suppresses DNMT1-mediated methylation on post-replicated DNA.\",\n      \"method\": \"In vitro methyltransferase assay, co-immunoprecipitation, ubiquitination assay, UHRF1 methylation-site mutant, bisulfite sequencing\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro methylation of non-histone substrate UHRF1, identification of specific methylation site, functional consequence on global DNA methylation\",\n      \"pmids\": [\"31400111\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"USP17 deubiquitinates and stabilizes the SET8 protein. USP17 interacts with SET8 and removes polyubiquitin chains from SET8. USP17 knockdown decreases SET8 protein levels and H4K20 monomethylation, increases p21 levels, and suppresses cell proliferation, triggering cellular senescence.\",\n      \"method\": \"Co-immunoprecipitation, in vitro deubiquitination assay, RNAi knockdown, cell proliferation/senescence assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and in vitro deubiquitination assay identifying first deubiquitinase of SET8, with functional cellular consequence\",\n      \"pmids\": [\"31533987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KMT5A/SET8 methylates α-tubulin at lysine 311. The transcription factor LSF/CP2 binds both α-tubulin and SET8 and enhances SET8-mediated α-tubulin methylation in vitro. The LSF inhibitor FQI1 counters LSF-facilitated tubulin methylation.\",\n      \"method\": \"In vitro radiolabeling, mass spectrometry, co-immunoprecipitation, immunofluorescence, pulldown assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro methyltransferase assay with MS identification of methylation site, Co-IP for protein interaction; single lab\",\n      \"pmids\": [\"32111740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"KMT5A monomethylates SNIP1 at K301. This methylation releases histone acetyltransferase KAT2A and promotes the interaction of c-MYC and KAT2A, leading to recruitment of the c-MYC/KAT2A complex to c-MYC target promoters. This inhibits the Hippo kinase cascade and transcriptionally activates MARK4, enhancing TNBC metastasis.\",\n      \"method\": \"In vitro methyltransferase assay, Co-immunoprecipitation, ChIP, SNIP1 K301 mutant analysis, in vivo xenograft\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and K301 mutant analysis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35449131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SETD8 ablation in neuroblastoma rescues p53 pro-apoptotic and cell-cycle arrest functions by decreasing p53K382me1, activating the p53 canonical pathway. Pharmacological inhibition with UNC0379 conferred survival advantage in xenograft NB models.\",\n      \"method\": \"RNAi screen, chemical screen, p53K382me1 immunoblot, xenograft model\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional screen with mechanistic validation of p53 methylation status; single lab\",\n      \"pmids\": [\"28073004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PR-SET7 deficiency in trophoblasts derepresses endogenous retroviruses (ERVs), causing double-stranded RNA stress and viral mimicry response that drives interferon response and necroptosis. H4K20me1 and H4K20me3 mediate suppression of ERV expression in trophoblasts. PR-SET7 deficiency in mice leads to defective trophoblasts and early embryonic loss.\",\n      \"method\": \"Conditional mouse knockout, RNA-seq, ChIP, interferon signaling assays, necroptosis assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with mechanistic ChIP and transcriptomic analysis; single study\",\n      \"pmids\": [\"37307441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"QM/MM computational analysis of SET8 catalysis revealed that the methylation reaction requires prior deprotonation of the target lysine, and that product specificity (monomethylation) results from a methyl substituent on the product blocking formation of a water channel required for subsequent deprotonation, preventing a second methylation.\",\n      \"method\": \"QM/MM molecular dynamics simulation, kinetic analysis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 (computational) / Moderate — QM/MM with agreement between computed and experimental free energy barriers; mechanism is computationally derived\",\n      \"pmids\": [\"18512960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MBTD1 associates with Pr-Set7 in mouse oocytes (demonstrated by co-IP). MBTD1 depletion reduces Pr-Set7 expression and H4K20me1 levels, causes DNA damage, and recapitulates phenotypes of Pr-Set7 depletion in oocyte meiotic maturation.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown, immunofluorescence\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP in oocytes; indirect evidence for complex; single lab\",\n      \"pmids\": [\"23475131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"STRA8 and SETD8 interact (yeast two-hybrid, confirmed by co-IP); SETD8 negatively regulates STRA8 promoter transcriptional activity. STRA8 increases SETD8 promoter activity in a dose-dependent manner. Both show cell cycle-dependent expression in germline cells, co-localizing with PCNA in spermatogonia.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, luciferase reporter assay, immunofluorescence\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid and Co-IP interaction; single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"32090428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SetD8 is a context-dependent GATA-1 corepressor in erythroid cells. SetD8 catalyzes H4K20me1 at a critical Gata2 cis-element and restricts Scl/TAL1 occupancy at the Gata2 enhancer, thereby repressing Gata2 transcription. Loss of SetD8 impairs erythroblast maturation and survival.\",\n      \"method\": \"shRNA knockdown, ChIP, erythroblast maturation assay, co-immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP directly linking SetD8/H4K20me1 to Gata2 regulatory element occupancy and transcription; functional rescue experiment\",\n      \"pmids\": [\"25855754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SETD8 interacts with STAT3 and is recruited by STAT3 to the DUSP10 promoter, epigenetically silencing DUSP10 expression via H4K20me1. Decreased DUSP10 (an ERK1/2 phosphatase) potentiates constitutive ERK1/2 activation in pancreatic cancer.\",\n      \"method\": \"Mass spectrometry, co-immunoprecipitation, ChIP, luciferase reporter assay, RNAi\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ChIP identifying STAT3-SETD8 co-occupancy at DUSP10 promoter; single lab\",\n      \"pmids\": [\"33232789\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KMT5A (SET8/PR-Set7/SETD8) is the sole mammalian enzyme that monomethylates histone H4 at lysine 20 (H4K20me1), acting via an SN2 mechanism requiring prior lysine deprotonation through a water channel; it also monomethylates non-histone substrates including p53 (K382), PCNA (K248), UHRF1 (K385), Numb, SNIP1 (K301), and α-tubulin (K311). Its protein levels are tightly regulated through the cell cycle by multiple ubiquitin E3 ligases (CRL4(Cdt2), SCF(β-TRCP), APC(Cdh1)) and stabilized by the deubiquitinase USP17; CDK1-mediated phosphorylation at S29 during mitosis removes it from chromosomes and protects it from APC. H4K20me1 established by KMT5A promotes replication origin licensing (via downstream Suv4-20h-mediated H4K20me3 and ORC1/ORCA recruitment), mitotic chromatin compaction, DNA damage response (53BP1 recruitment via NHEJ), and transcriptional repression through the L3MBTL1 reader; loss of KMT5A causes S-phase defects, re-replication, chromosome condensation failure, and embryonic lethality in mice.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KMT5A (SET8/PR-Set7/SETD8) is the sole mammalian enzyme that monomethylates histone H4 at lysine 20 (H4K20me1), a single-subunit methyltransferase that prefers nucleosomal substrate and whose loss is lethal in Drosophila and mice [#0, #6]. Crystallographic, NMR, peptide-array, kinetic-isotope, and QM/MM studies define a long, sequence-specific recognition motif around H4K20 (RHRK20VLRDN) and an SN2 catalytic mechanism that requires prior lysine deprotonation through a water channel; the methyl group installed on the product blocks channel reformation, enforcing strict monomethylation [#2, #4, #18, #27, #34]. SET8 docks onto the nucleosome through multivalent i-SET/c-SET contacts with DNA and an arginine-anchor interaction with the H2A/H2B acidic patch, and PCNA competes with the nucleosome for the same N-terminal extension, coupling its enzymatic engagement to the replication context [#26]. Beyond histones, SET8 monomethylates a panel of non-histone substrates with defined functional consequences: p53 at K382 to dampen p53 transcriptional and apoptotic output through the L3MBTL1 reader [#5, #10, #32], PCNA at K248 to promote FEN1 binding and Okazaki fragment maturation [#16], UHRF1 at K385 to trigger its degradation and limit DNMT1-dependent DNA methylation [#28], Numb to release p53 for degradation [#19], SNIP1 at K301 [#31], and \\u03b1-tubulin at K311 [#30]. H4K20me1 deposited by SET8 licenses replication origins via downstream Suv4-20h-mediated H4K20me3 and ORC recruitment, drives mitotic chromatin compaction, supports 53BP1 recruitment and NHEJ-mediated double-strand break repair, and enforces transcriptional repression through readers including L3MBTL1 [#13, #17, #8, #21, #9]; accordingly SET8 loss causes S-phase accumulation, re-replication, chromosome condensation failure, DNA damage, and embryonic lethality [#6, #8, #13]. SET8 protein abundance is gated through the cell cycle by multiple ubiquitin E3 ligases\\u2014CRL4(Cdt2) acting through a PCNA-binding PIP degron during S phase and after damage, SCF(\\u03b2-TRCP) after UV damage, and APC(Cdh1) in late mitosis\\u2014counterbalanced by the deubiquitinase USP17, while CDK1/cyclinB phosphorylation at Ser29 removes it from mitotic chromosomes and shields it from APC until Cdc14 dephosphorylation [#11, #12, #24, #14, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the identity and core activity of the enzyme: it answered which protein deposits H4K20 methylation and whether it is essential.\",\n      \"evidence\": \"Biochemical purification, in vitro methyltransferase assay, and Drosophila genetic knockout, plus an in vitro competition assay showing H4K20 methylation and H4K16 acetylation are mutually antagonistic\",\n      \"pmids\": [\"12121615\", \"12086618\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalytic mechanism and structural basis of specificity not yet defined\", \"Non-histone substrates unknown at this stage\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Defined the structural and sequence basis for substrate recognition and why the enzyme is a strict monomethylase, answering how specificity is achieved.\",\n      \"evidence\": \"X-ray crystallography of SET8\\u2013H4 peptide\\u2013SAH complexes, NMR, deletion mapping (residues 195\\u2013352), and alanine-scanning of the RHRK20VLRDN motif\",\n      \"pmids\": [\"15933070\", \"15933069\", \"15964846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nucleosome-level engagement not resolved by peptide structures\", \"Catalytic transition-state geometry not yet measured\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended the enzyme from a histone writer to a regulator of p53 and DNA replication, answering whether it has non-histone substrates and a replication role.\",\n      \"evidence\": \"In vitro methylation identifying p53 K382, RNAi/reporter assays, PCNA Co-IP via a PIP motif, DNA fiber assays, and mouse knockout\",\n      \"pmids\": [\"17707234\", \"18166648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling H4K20me1 to replication licensing not yet defined\", \"Whether replication phenotype is p53-independent unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Separated the enzyme's catalytic from scaffolding functions and tied catalysis to mitosis and a trans-tail code, while defining how PCNA couples methylation to S phase.\",\n      \"evidence\": \"Dominant-negative catalytic mutant cell-cycle analysis, PIP-box mutant PCNA tethering, ChIP/reporter assays for the H4K20me1\\u2013L3MBTL1\\u2013H3K9me1 axis, and QM/MM mechanism modeling\",\n      \"pmids\": [\"18480059\", \"18319261\", \"18474616\", \"18512960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the recruited H3K9 monomethyltransferase not established here\", \"QM/MM mechanism is computationally derived\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved how the enzyme is degraded and how its product feeds origin licensing and chromatin compaction, answering how its activity is temporally restricted.\",\n      \"evidence\": \"Ubiquitylation assays and degron/phospho-mutant stability analyses (CRL4(Cdt2), Skp2, APC(Cdh1), CDK1-S29), laser microirradiation for damage recruitment, tethering/ChIP for origin licensing, and crystallography of L3MBTL1 reading p53K382me1\",\n      \"pmids\": [\"21035370\", \"20932472\", \"21220508\", \"20953199\", \"20966048\", \"20870725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each E3 ligase across cell-cycle states not delineated\", \"Reader landscape for H4K20me1 beyond L3MBTL1 incomplete\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected H4K20me1 to the downstream H4K20me3/ORC origin pathway and added PCNA K248 methylation, refining how the enzyme supports replication fidelity.\",\n      \"evidence\": \"Conditional mouse knockout epistasis with Suv4-20h, tethering/ChIP for ORC recruitment, peptide-array motif mapping, and in vitro PCNA K248 methylation with Okazaki fragment assays\",\n      \"pmids\": [\"23152447\", \"22583696\", \"22556262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ORC1/ORCA binding to H4K20me3 inferred rather than reconstituted here\", \"Generality of K248 methylation across replication contexts unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined direct action at double-strand breaks and additional non-histone substrates/partners, answering how the enzyme participates in repair and apoptosis control.\",\n      \"evidence\": \"Enzymatic activity measurement at laser-induced DSBs with NHEJ reporter, Numb methylation Co-IP/apoptosis assays, and Riz1/PRDM2 pulldown/localization studies\",\n      \"pmids\": [\"25252681\", \"23706821\", \"24423864\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"DSB role from a single lab without reciprocal validation\", \"Numb and Riz1 interactions not reconstituted structurally\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified UHRF1 K385 methylation linking SET8 to global DNA methylation and the first stabilizing deubiquitinase, expanding the regulatory and substrate network.\",\n      \"evidence\": \"In vitro UHRF1 methylation with site mutant and bisulfite sequencing; USP17 Co-IP and in vitro deubiquitination with senescence assays\",\n      \"pmids\": [\"31400111\", \"31533987\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"USP17 evidence from a single study\", \"In vivo significance of UHRF1 methylation for genomic methylation patterns incompletely mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Placed H4K20 methylation in developmental ERV silencing, answering one mechanism for the embryonic lethality of SET8 loss.\",\n      \"evidence\": \"Conditional mouse knockout in trophoblasts with RNA-seq, ChIP, interferon and necroptosis assays\",\n      \"pmids\": [\"37307441\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-study mechanism\", \"Direct H4K20 methylation at specific ERV loci versus indirect effects not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse non-histone substrate methylations and tissue-specific transcriptional roles are coordinated with cell-cycle-gated SET8 abundance to produce context-specific outcomes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified model integrating histone vs non-histone substrate choice\", \"Tissue-specific corepressor partnerships (GATA-1, STAT3, TWIST) lack shared mechanistic framework\", \"Substrate selection determinants in vivo undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 4, 5, 16, 19, 28, 30, 31]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 16, 19, 28, 30, 31]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [0, 2, 26]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [5, 9, 37, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 7, 13, 21]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5, 22, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [6, 7, 13, 16]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [8, 11, 12, 14]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 21, 24]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 9, 23]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [5, 10, 37, 38]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [13, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PCNA\", \"TP53\", \"L3MBTL1\", \"UHRF1\", \"TWIST1\", \"PRDM2\", \"STAT3\", \"SNIP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}