{"gene":"ASF1A","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2005,"finding":"ASF1a forms a physical complex with HIRA that is rate-limiting for formation of senescence-associated heterochromatin foci (SAHF) and onset of cellular senescence; ASF1a is required for incorporation of macroH2A and HP1 proteins into SAHF and for senescence-associated cell cycle exit, operating through a pathway that involves flux of heterochromatic proteins through PML nuclear bodies.","method":"Co-immunoprecipitation of HIRA-ASF1a complex; siRNA knockdown of ASF1a with SAHF formation and cell cycle exit as phenotypic readouts; immunofluorescence localization to PML bodies","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus loss-of-function with defined cellular phenotype, replicated across multiple labs","pmids":["15621527"],"is_preprint":false},{"year":2007,"finding":"Crystal structure (2.7 Å) of CIA-I (ASF1a) in complex with histones H3 and H4 shows that the C-terminal β-strand of histone H4 switches binding partner from histone H2A to ASF1a via a large conformational change; ASF1a has histone H3-H4 tetramer-disrupting activity in vitro, and mutants with weak H3-H4 dimer binding activity show critical functional effects on transcription-related cellular processes.","method":"X-ray crystallography; in vitro histone tetramer disruption assay; structure-guided mutagenesis with cellular functional readouts","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with in vitro functional assay and mutagenesis in a single study","pmids":["17293877"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the human ASF1a-HIRA heterodimer reveals that the HIRA B domain forms an antiparallel β-hairpin that binds perpendicular to the β-sandwich of ASF1a via β-sheet, salt bridge, and van der Waals contacts; the N- and C-terminal regions of ASF1a (but not ASF1b) determine preferential interaction with HIRA; CAF-1 p60 uses a B domain-like motif to compete with HIRA for binding to ASF1a.","method":"X-ray crystallography; biochemical competition assays (pull-down, ITC); mutational analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus biochemical dissection of binding specificity with mutagenesis","pmids":["16980972"],"is_preprint":false},{"year":2007,"finding":"HIRA's translocation to PML nuclear bodies is required for SAHF formation (shown by dominant-negative HIRA mutants and PML-RARα disruption of PML bodies); downstream of PML body localization, the HIRA/ASF1a pathway acts in parallel with pRB to drive SAHF formation, with convergence occurring through the DNAJ-domain protein DNAJA2.","method":"Dominant-negative mutants blocking HIRA-PML colocalization; PML-RARα overexpression to disrupt PML bodies; genetic epistasis analysis with pRB and p53 loss-of-function; identification of DNAJA2 as convergence point","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genetic and cell biological approaches establishing pathway position","pmids":["17242198"],"is_preprint":false},{"year":2008,"finding":"UBN1 (human ortholog of yeast Hpc2p) is a component of the HIRA/ASF1a chromatin-remodeling complex; the Hpc2-related domain (HRD) of UBN1 directly interacts with the N-terminal WD repeats of HIRA; UBN1 binds proliferation-promoting genes repressed in senescence, associates with H3K9 methyltransferase activity, and is indispensable for SAHF formation.","method":"Co-immunoprecipitation of endogenous complex; recombinant protein binding assays; siRNA knockdown with SAHF formation readout; chromatin immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, ChIP, KD phenotype) in single study","pmids":["19029251"],"is_preprint":false},{"year":2011,"finding":"CABIN1 is assembled into the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex via HIRA acting as a scaffold; HIRA interacts with CABIN1 at endogenous levels; CABIN1 is required for heterochromatinization of the senescent genome and co-regulates H3.3-enriched genes together with HIRA in proliferating cells.","method":"Endogenous and ectopic Co-immunoprecipitation; reconstitution of quaternary complex from recombinant proteins; mutational analysis of HIRA scaffold function; siRNA knockdown with chromatin phenotype readout","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — reconstitution of quaternary complex plus reciprocal Co-IP and loss-of-function phenotype","pmids":["21807893"],"is_preprint":false},{"year":2011,"finding":"ASF1a is required for post-repair restoration of histone H3K56 acetylation (H3K56Ac) following UV irradiation; restored H3K56Ac is needed for dephosphorylation of γ-H2AX and cellular recovery from checkpoint arrest; H3K56Ac restoration is regulated by ATM checkpoint kinase.","method":"siRNA knockdown of ASF1a; quantitative immunoblot of H3K56Ac, γ-H2AX; cell cycle checkpoint recovery assays; ATM inhibition epistasis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — clean KD with defined molecular and cellular phenotype plus pathway epistasis","pmids":["21727091"],"is_preprint":false},{"year":2012,"finding":"UBN1 residues 41–77 (NHRD) form a tight 1:1 complex (nanomolar Kd) with the WD repeats of HIRA; this interaction is essential for assembly and stability of the HUCA complex in vitro and in vivo; key NHRD residues are required for HIRA interaction and chromatin organization in primary human cells.","method":"Analytical ultracentrifugation; mutational analysis; in vitro binding assays; cellular chromatin organization assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding with AUC quantification plus mutagenesis and cellular validation","pmids":["22401310"],"is_preprint":false},{"year":2013,"finding":"ASF1a and ASF1b have undergone subfunctionalization after vertebrate gene duplication; regions outside the primary H3-H4 interaction surface (particularly N- and C-terminal regions carrying signatures of positive selection) determine the preferential interactions of ASF1a versus ASF1b with distinct H3-H4 chaperone complexes.","method":"Biochemical binding assays with purified proteins; structural analysis; evolutionary analysis with site-specific signatures of positive selection","journal":"Molecular biology and evolution","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical demonstration of differential binding specificity, moderate support from single study","pmids":["23645555"],"is_preprint":false},{"year":2014,"finding":"ASF1a is required for maintenance of pluripotency and somatic cell reprogramming; ASF1a is specifically enriched in the metaphase II human oocyte; overexpression of ASF1a together with OCT4 and oocyte paracrine factor GDF9 is sufficient to reprogram human adult dermal fibroblasts to pluripotent cells.","method":"siRNA knockdown of ASF1a in reprogramming assay; ASF1a overexpression with OCT4 and GDF9; pluripotency marker assessment","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function and gain-of-function with defined pluripotency phenotype, single lab","pmids":["25035411"],"is_preprint":false},{"year":2014,"finding":"Upon replication stress (doxorubicin), the ATR checkpoint kinase promotes degradation of ASF1a through the CRL1(βTRCP) ubiquitin-proteasome pathway, leading to dechromatinization and repression of genes overlapping clusters of stalled replication forks.","method":"Doxorubicin treatment; proteasome inhibitor rescue; CRL1(βTRCP) knockdown epistasis; ATR inhibition; ChIP for chromatin occupancy; ASF1a protein level assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing pathway: checkpoint kinase → ubiquitin ligase → ASF1a degradation → gene repression","pmids":["24700029"],"is_preprint":false},{"year":2016,"finding":"ASF1A-H3-H4 complex participates in CAF-1-dependent histone (H3-H4)₂ tetramer deposition during DNA replication; MutSα (MMR factor) inhibits CAF-1- and ASF1A-H3-H4-dependent packaging of a DNA mismatch into a tetrasome, indicating MMR acts before tetrasome formation; CAF-1/ASF1A-dependent tetramer deposition protects the discontinuous daughter strand from unnecessary degradation by MMR machinery.","method":"Reconstituted human in vitro MMR and nucleosome assembly systems; tetrasome assembly assay; strand degradation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — fully reconstituted in vitro system with mechanistic dissection","pmids":["26945061"],"is_preprint":false},{"year":2016,"finding":"sNASP contains at least two additional histone interaction sites beyond the competing TPR-H3 interface that are compatible with ASF1A binding, allowing formation of a quaternary sNASP-ASF1A-H3-H4 complex; sNASP makes a specific complex with H3 alone but not H4, suggesting it acts upstream of ASF1A; together, sNASP and ASF1A can fold an H3-H4 dimer in vitro.","method":"Monobody-aided protein interaction mapping; in vitro binding assays; native gel electrophoresis showing quaternary complex; histone folding assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — reconstituted complexes with orthogonal biochemical assays demonstrating sequential chaperone action","pmids":["28123037"],"is_preprint":false},{"year":2017,"finding":"ASF1a interacts with MDC1 and is recruited to double-strand break (DSB) sites where it facilitates the interaction of phospho-ATM with MDC1 and ATM-mediated phosphorylation of MDC1; this is required for recruitment of RNF8/RNF168 ubiquitin ligases, histone ubiquitination, 53BP1 recruitment, and NHEJ repair. This role is unique to ASF1a (not ASF1b) and does not require ASF1a's histone chaperone activity.","method":"Co-immunoprecipitation of ASF1a-MDC1 interaction; siRNA knockdown with laser-induced DSB foci as readout; NHEJ reporter assay; ATM kinase assay; ASF1a mutants lacking chaperone activity","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, clean KD with defined pathway readouts, domain mutant analysis distinguishing chaperone from repair functions","pmids":["28943310"],"is_preprint":false},{"year":2018,"finding":"USP52 is a bona fide deubiquitinase that physically associates with ASF1a, promotes its deubiquitination and stabilization, facilitating chromatin assembly and cell cycle progression; impairment of USP52-promoted ASF1a stabilization causes growth arrest and sensitizes breast cancer cells to DNA damage.","method":"Co-immunoprecipitation; in vitro deubiquitinase assay; knockdown with cell cycle and DNA damage phenotype readouts","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro deubiquitinase activity demonstrated plus reciprocal Co-IP and functional cellular consequences","pmids":["29599486"],"is_preprint":false},{"year":2018,"finding":"Asf1a is recruited to bivalent chromatin promoters (partially through association with transcription factors) and mediates nucleosome disassembly required for resolution of bivalent domains and activation of lineage-specific genes during mouse ES cell differentiation; the Asf1a-histone interaction (not its nucleosome assembly role) is required for gene transcription.","method":"Asf1a knockout mouse ES cells; ChIP-seq for Asf1a, H3K27me3, H3K4me3; nucleosome disassembly assay; domain mutants separating histone binding from assembly activity","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — KO with defined molecular phenotype, ChIP evidence, mutant dissection of mechanism","pmids":["29915027"],"is_preprint":false},{"year":2019,"finding":"ASF1a inhibition in tumor cells promotes immunogenic M1-like macrophage differentiation in the tumor microenvironment by upregulating GM-CSF expression, potentiating T-cell activation and sensitizing KRAS-mutant lung adenocarcinoma to anti-PD-1 therapy.","method":"In vivo CRISPR screen; Asf1a-knockout tumor cells; tumor microenvironment analysis; GM-CSF measurement; macrophage polarization assays; anti-PD-1 combination treatment","journal":"Cancer discovery","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO with defined pathway readout (GM-CSF upregulation → macrophage polarization), single study","pmids":["31744829"],"is_preprint":false},{"year":2019,"finding":"ASF1a knockdown in wild-type p53-carrying cancer cells induces widespread DNA damage, robust upregulation of p53 and p21cip1 expression, and subsequent cellular senescence; p53 inhibition attenuates p21cip1 induction caused by ASF1a depletion, placing ASF1a upstream of p53-p21cip1 in the senescence pathway.","method":"siRNA knockdown; immunoblot for p53/p21; DNA damage markers (γ-H2AX); p53 inhibitor epistasis; SA-β-galactosidase senescence assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with pathway placement via epistasis, moderate support from single lab","pmids":["30692519"],"is_preprint":false},{"year":2015,"finding":"The E2 ubiquitin-conjugating enzyme RAD6 cooperates with E3 ligase MDM2 to promote ubiquitination and proteasomal turnover of ASF1A; this RAD6-MDM2 ubiquitin ligase machinery is evolutionarily conserved (demonstrated in Drosophila and human cells).","method":"Co-immunoprecipitation in human and Drosophila cells; in vivo ubiquitination assays; MDM2 knockdown/overexpression; proteasome inhibitor rescue","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus ubiquitination assay, single lab","pmids":["26336826"],"is_preprint":false},{"year":2021,"finding":"In G1 phase, Chk1 activated by ATM at DNA double-strand breaks directly phosphorylates ASF1A at Ser-166; phospho-Ser-166 ASF1A interacts with MDC1 and enhances MDC1's interaction with ATM and stable localization of ATM at DSBs; Chk1 deficiency suppresses histone ubiquitination, 53BP1 foci, and NHEJ downstream of MDC1.","method":"In vitro kinase assay (Chk1 phosphorylation of ASF1A); phospho-specific antibody; Co-IP of phospho-ASF1A with MDC1; Chk1 inhibitor/knockdown with NHEJ reporter assay; G1 cell cycle synchronization","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay demonstrating direct phosphorylation plus cellular epistasis with pathway readouts","pmids":["33503415"],"is_preprint":false},{"year":2010,"finding":"Crystal structure (3.3 Å) of CIA/ASF1 in complex with the double bromodomain of CCG1/TAF1 reveals structural basis for their interaction; this interaction is required for colocalization of the two proteins, histone eviction, and RNA polymerase II entry at active promoter regions; the structure provides a mechanistic link between histone acetylation recognition by the bromodomain and ASF1-mediated histone eviction.","method":"X-ray crystallography; co-immunoprecipitation; chromatin immunoprecipitation of histone occupancy and Pol II; cellular colocalization assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure combined with ChIP and functional cellular assays","pmids":["20393127"],"is_preprint":false},{"year":2024,"finding":"ASF1A acts as a cofactor of histone acetyltransferase P300 to precisely regulate enrichment of histone H3K18 lactylation (H3K18la) at the SNAI1 promoter, thereby activating SNAI1 transcription and promoting endothelial-to-mesenchymal transition (EndMT); endothelium-specific deletion of Asf1a inhibits EndMT and alleviates atherosclerosis development in Apoe KO mice.","method":"Co-immunoprecipitation of ASF1A-P300 complex; ChIP for H3K18la at SNAI1 promoter; endothelium-specific Asf1a conditional knockout mouse (Apoe KO Asf1a ECKO) atherosclerosis model; PROTAC-mediated protein degradation","journal":"Acta pharmaceutica Sinica. B","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, ChIP, and in vivo KO with defined mechanistic and disease phenotype","pmids":["39027248"],"is_preprint":false},{"year":2020,"finding":"Natural product artone directly binds ASF1a and modulates histone H3 post-translational modifications (decreasing acetylation and trimethylation at H3K4, H3K9, H3K18, K27), preventing NF-κB assembly at promoters of pro-inflammatory cytokine genes (Tnf-α, Il-6, Rgs3) in microglia.","method":"Direct binding assay (artone-ASF1a interaction); histone PTM mass spectrometry/immunoblot; ChIP for NF-κB at cytokine gene promoters; LPS-activated microglia model","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct binding demonstrated plus ChIP mechanistic readout, moderate support","pmids":["32222456"],"is_preprint":false},{"year":2002,"finding":"Human CIA/ASF1 (hASF1) interacts with the two tandem bromodomain modules of hTAFII250/CCG1, the largest TFIID subunit; yeast Asf1p correspondingly interacts with Bdf1p (the missing bromodomain of yTAFII145); genetic interaction between ASF1 and BDF1 (synthetic lethality of double knockout; suppression of Spt phenotype by TFIID overexpression) establishes functional linkage between the histone chaperone and TFIID.","method":"GST pull-down; co-immunoprecipitation; yeast genetic synthetic lethality; Spt phenotype suppression assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal pull-down/Co-IP plus orthogonal genetic epistasis in yeast (ortholog)","pmids":["12093919"],"is_preprint":false},{"year":2012,"finding":"HIRA (but not ASF1a) knockdown significantly reduces p53-mediated induction of large ALT-associated PML bodies and large HP1 foci in ALT cancer cells, demonstrating that HIRA has an ASF1a-independent role in HP1 localization to PML bodies; however, both HIRA and ASF1a colocalize inside PML bodies in normal fibroblasts approaching senescence.","method":"siRNA knockdown of HIRA vs. ASF1a; immunofluorescence of HP1, APB, PML body quantification; p53/p21 pathway activation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — single KD comparison establishing differential pathway roles, moderate mechanistic specificity","pmids":["21347226"],"is_preprint":false}],"current_model":"ASF1A is a histone H3-H4 chaperone that, structurally, binds an H3-H4 dimer via its β-sandwich domain displacing the H4 C-terminal strand from H2A, thereby disrupting H3-H4 tetramers; it operates as part of the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex—assembled through HIRA as a scaffold—to drive replication-independent H3.3 deposition, senescence-associated heterochromatin foci (SAHF) formation, and bivalent chromatin resolution during differentiation; independently of its chaperone activity, ATM-activated Chk1 phosphorylates ASF1A at Ser-166, enabling its interaction with MDC1 and promotion of NHEJ repair at double-strand breaks; its abundance is regulated by USP52-mediated deubiquitination and by ATR/CRL1(βTRCP)- and RAD6/MDM2-mediated ubiquitin-proteasome degradation; and it acts as a P300 cofactor to regulate H3K18 lactylation-dependent gene transcription."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing that ASF1A physically and functionally links histone chaperoning to TFIID-dependent transcription resolved how a histone chaperone interfaces with the basal transcription machinery.","evidence":"GST pull-down and Co-IP of human ASF1a with TAF1/CCG1 bromodomains; synthetic lethality and Spt suppression in yeast orthologs","pmids":["12093919"],"confidence":"High","gaps":["No structural detail of the ASF1a–TAF1 interface at this stage","Unclear which histone PTMs gate the interaction in vivo"]},{"year":2005,"claim":"Demonstrating that the ASF1a–HIRA complex is rate-limiting for SAHF formation and senescence-associated cell cycle exit placed ASF1a in a defined chromatin-remodeling pathway controlling cellular senescence.","evidence":"Reciprocal Co-IP of HIRA–ASF1a; siRNA knockdown of ASF1a with SAHF and cell cycle exit readouts; immunofluorescence showing PML body flux","pmids":["15621527"],"confidence":"High","gaps":["Identity of additional HUCA subunits not yet known","Mechanism of PML body transit unresolved"]},{"year":2006,"claim":"The crystal structure of the ASF1a–HIRA B-domain heterodimer revealed the molecular basis for ASF1a's preferential partnership with HIRA over CAF-1, explaining paralog subfunctionalization at the structural level.","evidence":"X-ray crystallography; ITC and competition pull-downs; mutagenesis showing CAF-1 p60 competes via a B-domain-like motif","pmids":["16980972"],"confidence":"High","gaps":["Full quaternary HUCA complex architecture unresolved","No in vivo validation of competition dynamics"]},{"year":2007,"claim":"The 2.7 Å crystal structure of ASF1a bound to H3-H4 established the mechanism of tetramer disruption: the H4 C-terminal β-strand switches from H2A to ASF1a, defining the core histone chaperone activity.","evidence":"X-ray crystallography; in vitro tetramer disruption assay; structure-guided mutagenesis with transcriptional readouts","pmids":["17293877"],"confidence":"High","gaps":["How ASF1a hands off H3-H4 dimers to downstream chaperones not yet reconstituted"]},{"year":2008,"claim":"Identification of UBN1 as an essential HUCA subunit that binds HIRA's WD repeats and targets senescence gene promoters expanded the complex from a dimer to a multi-subunit assembly with gene-specific chromatin roles.","evidence":"Co-IP of endogenous complex; recombinant binding assays; siRNA with SAHF readout; ChIP at proliferation genes","pmids":["19029251"],"confidence":"High","gaps":["CABIN1 not yet placed in the complex","Stoichiometry uncertain"]},{"year":2010,"claim":"The crystal structure of ASF1a with the TAF1 double bromodomain provided a structural mechanism linking histone acetylation recognition to ASF1a-mediated histone eviction and RNA Pol II entry at promoters.","evidence":"3.3 Å crystal structure; Co-IP; ChIP for histone occupancy and Pol II at active promoters","pmids":["20393127"],"confidence":"High","gaps":["Genome-wide scope of ASF1a–TAF1-dependent promoter clearance not tested","Kinetics of eviction in vivo unknown"]},{"year":2011,"claim":"Reconstitution of the quaternary HUCA complex (HIRA/UBN1/CABIN1/ASF1a) with HIRA as scaffold, and demonstration that ASF1a restores H3K56Ac post-UV damage for checkpoint recovery, expanded ASF1a's roles to both complex assembly and DNA damage recovery.","evidence":"Recombinant quaternary complex reconstitution; reciprocal Co-IP of CABIN1; siRNA of ASF1a with H3K56Ac, γ-H2AX, and checkpoint recovery readouts; ATM inhibition epistasis","pmids":["21807893","21727091"],"confidence":"High","gaps":["How H3K56Ac restoration is coordinated with nucleosome reassembly in vivo","Whether CABIN1 contributes to the DNA damage function"]},{"year":2014,"claim":"Discovery that ATR triggers CRL1(βTRCP)-mediated proteasomal degradation of ASF1a during replication stress, and that ASF1a overexpression with OCT4/GDF9 suffices for somatic cell reprogramming, revealed regulated ASF1a turnover and a role in pluripotency.","evidence":"Doxorubicin-induced replication stress with proteasome inhibitor rescue and CRL1/ATR epistasis; ASF1a overexpression reprogramming assay with pluripotency markers","pmids":["24700029","25035411"],"confidence":"High","gaps":["Degron motif on ASF1a for βTRCP not mapped","Mechanism by which ASF1a enables reprogramming beyond chromatin remodeling unclear"]},{"year":2016,"claim":"Reconstituted systems showed ASF1A cooperates with CAF-1 for (H3-H4)₂ tetrasome deposition during DNA replication, and that sNASP acts upstream of ASF1A to fold H3-H4 dimers, defining the histone chaperone relay.","evidence":"Fully reconstituted in vitro MMR and nucleosome assembly; sNASP–ASF1A–H3–H4 quaternary complex by native gel; histone folding assay","pmids":["26945061","28123037"],"confidence":"High","gaps":["In vivo order of hand-off from sNASP to ASF1A not confirmed","How MMR factor MutSα signals to block ASF1A-dependent tetrasome deposition mechanistically"]},{"year":2017,"claim":"A chaperone-independent function of ASF1a in NHEJ was established: ASF1a interacts with MDC1 to facilitate phospho-ATM docking and downstream RNF8/RNF168 ubiquitination at DSBs, distinguishing its DNA repair role from histone chaperoning.","evidence":"Reciprocal Co-IP of ASF1a–MDC1; siRNA with laser-induced DSB foci; NHEJ reporter; chaperone-dead mutant retaining repair function","pmids":["28943310"],"confidence":"High","gaps":["Structural basis of ASF1a–MDC1 interaction not resolved","Phosphorylation event on ASF1a enabling this interaction not yet identified"]},{"year":2018,"claim":"USP52 was identified as the deubiquitinase stabilizing ASF1A, and Asf1a was shown to resolve bivalent chromatin domains during ES cell differentiation via nucleosome disassembly at lineage gene promoters, linking ASF1a turnover control and differentiation-specific chromatin dynamics.","evidence":"In vitro DUB assay for USP52; Co-IP; Asf1a KO mouse ES cells with ChIP-seq for bivalent marks; domain mutants separating histone binding from assembly","pmids":["29599486","29915027"],"confidence":"High","gaps":["Whether USP52 regulation of ASF1a is cell-cycle-dependent","How ASF1a is recruited specifically to bivalent promoters"]},{"year":2021,"claim":"Identification of Chk1 phosphorylation of ASF1A at Ser-166 downstream of ATM in G1 closed the gap on how ASF1a is activated for its MDC1-dependent NHEJ role, completing the signaling cascade from DSB sensing to histone ubiquitination.","evidence":"In vitro Chk1 kinase assay; phospho-Ser166 antibody; Co-IP of phospho-ASF1A with MDC1; Chk1 inhibitor/KD with NHEJ reporter in G1-synchronized cells","pmids":["33503415"],"confidence":"High","gaps":["Whether additional kinases phosphorylate ASF1A at other sites for repair","Structural basis of phospho-Ser166 recognition by MDC1"]},{"year":2024,"claim":"ASF1A was shown to act as a P300 cofactor directing site-specific H3K18 lactylation at the SNAI1 promoter, establishing a non-canonical transcriptional regulatory function with in vivo relevance to endothelial-to-mesenchymal transition and atherosclerosis.","evidence":"Co-IP of ASF1A–P300; ChIP for H3K18la at SNAI1; endothelium-specific Asf1a conditional KO in Apoe-null atherosclerosis model","pmids":["39027248"],"confidence":"High","gaps":["Whether ASF1A–P300 co-regulation extends beyond SNAI1 to other lactylation targets","Mechanism by which ASF1A directs P300 substrate specificity toward lactylation versus acetylation"]},{"year":null,"claim":"Key unresolved questions include the structural basis for ASF1A's interaction with MDC1, the genome-wide scope of ASF1A-directed histone lactylation, and how ASF1A's chaperone-dependent and chaperone-independent functions are coordinately regulated across the cell cycle.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of ASF1A–MDC1 complex","No genome-wide map of ASF1A-dependent H3K18 lactylation","Cell-cycle-specific regulation of ASF1A phosphorylation, ubiquitination, and complex partitioning not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[1,11,12,15]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[1,12]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[21,20,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[13,19,21]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3,13,15,19]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[0,6,15,21]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[13,19]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1,5,11,15,21]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6,13,19]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,14,17]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[20,21,23]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[11]}],"complexes":["HUCA (HIRA/UBN1/CABIN1/ASF1a)","sNASP-ASF1A-H3-H4","CAF-1/ASF1A-H3-H4"],"partners":["HIRA","UBN1","CABIN1","MDC1","USP52","NASP","EP300","TAF1"],"other_free_text":[]},"mechanistic_narrative":"ASF1A is a histone H3-H4 chaperone that disrupts H3-H4 tetramers via its β-sandwich domain and participates in both replication-coupled and replication-independent chromatin assembly as part of the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex, functioning in senescence-associated heterochromatin foci (SAHF) formation, bivalent chromatin resolution during differentiation, and histone eviction at active promoters in concert with the TFIID subunit TAF1/CCG1 [PMID:15621527, PMID:17293877, PMID:21807893, PMID:29915027, PMID:20393127]. Independent of its histone chaperone activity, ATM-activated Chk1 phosphorylates ASF1A at Ser-166, enabling interaction with MDC1 to stabilize ATM at double-strand breaks and promote RNF8/RNF168-mediated histone ubiquitination, 53BP1 recruitment, and non-homologous end joining [PMID:28943310, PMID:33503415]. ASF1A protein abundance is regulated by USP52-mediated deubiquitination and by ATR/CRL1(βTRCP)- and RAD6/MDM2-dependent ubiquitin-proteasome degradation [PMID:29599486, PMID:24700029, PMID:26336826]. ASF1A also functions as a P300 cofactor directing H3K18 lactylation at specific promoters to activate transcription, with endothelial Asf1a deletion attenuating endothelial-to-mesenchymal transition and atherosclerosis in vivo [PMID:39027248]."},"prefetch_data":{"uniprot":{"accession":"Q9Y294","full_name":"Histone chaperone ASF1A","aliases":["Anti-silencing function protein 1 homolog A","hAsf1","hAsf1a","CCG1-interacting factor A","CIA","hCIA"],"length_aa":204,"mass_kda":23.0,"function":"Histone chaperone that facilitates histone deposition and histone exchange and removal during nucleosome assembly and disassembly (PubMed:10759893, PubMed:11897662, PubMed:12842904, PubMed:14718166, PubMed:15664198, PubMed:16151251, PubMed:21454524). Cooperates with chromatin assembly factor 1 (CAF-1) to promote replication-dependent chromatin assembly and with HIRA to promote replication-independent chromatin assembly (PubMed:11897662, PubMed:14718166, PubMed:15664198). Promotes homologous recombination-mediated repair of double-strand breaks (DSBs) at stalled or collapsed replication forks: acts by mediating histone replacement at DSBs, leading to recruitment of the MMS22L-TONSL complex and subsequent loading of RAD51 (PubMed:29478807). Also involved in the nuclear import of the histone H3-H4 dimer together with importin-4 (IPO4): specifically recognizes and binds newly synthesized histones with the monomethylation of H3 'Lys-9' and acetylation at 'Lys-14' (H3K9me1K14ac) marks, and diacetylation at 'Lys-5' and 'Lys-12' of H4 (H4K5K12ac) marks in the cytosol (PubMed:21454524, PubMed:29408485). 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UBN2","url":"https://www.omim.org/entry/613841"},{"mim_id":"609771","title":"UBINUCLEIN 1; UBN1","url":"https://www.omim.org/entry/609771"},{"mim_id":"609190","title":"ANTI-SILENCING FUNCTION 1B HISTONE CHAPERONE; ASF1B","url":"https://www.omim.org/entry/609190"},{"mim_id":"609189","title":"ANTI-SILENCING FUNCTION 1A HISTONE CHAPERONE; ASF1A","url":"https://www.omim.org/entry/609189"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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of CIA and CIB, Two α-Conotoxins from the Predation-Evoked Venom of Conus catus.","date":"2018","source":"Toxins","url":"https://pubmed.ncbi.nlm.nih.gov/29857567","citation_count":20,"is_preprint":false},{"pmid":"36794740","id":"PMC_36794740","title":"Panax notoginseng saponins (PNS) attenuate Th17 cell differentiation in CIA mice via inhibition of nuclear PKM2-mediated STAT3 phosphorylation.","date":"2023","source":"Pharmaceutical biology","url":"https://pubmed.ncbi.nlm.nih.gov/36794740","citation_count":20,"is_preprint":false},{"pmid":"30105062","id":"PMC_30105062","title":"Comparative Studies of Different Extracts from Eucommia ulmoides Oliv. against Rheumatoid Arthritis in CIA Rats.","date":"2018","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/30105062","citation_count":20,"is_preprint":false},{"pmid":"31865066","id":"PMC_31865066","title":"Effects of daphnetin on the autophagy signaling pathway of fibroblast-like 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articular damage in murine model.","date":"2022","source":"Inflammopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35254584","citation_count":15,"is_preprint":false},{"pmid":"9067521","id":"PMC_9067521","title":"Characteristics of synovial fluid effusion in collagen-induced arthritis (CIA) in the DA rat; a comparison of histology and antibody reactivities in an experimental chronic arthritis model and rheumatoid arthritis (RA).","date":"1997","source":"Clinical and experimental immunology","url":"https://pubmed.ncbi.nlm.nih.gov/9067521","citation_count":15,"is_preprint":false},{"pmid":"38908493","id":"PMC_38908493","title":"Wutou decoction alleviates arthritis inflammation in CIA mice by regulating Treg cell stability and Treg/Th17 balance via the JAK2/STAT3 pathway.","date":"2024","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38908493","citation_count":15,"is_preprint":false},{"pmid":"26336826","id":"PMC_26336826","title":"A conserved RAD6-MDM2 ubiquitin ligase machinery targets histone chaperone ASF1A in tumorigenesis.","date":"2015","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26336826","citation_count":14,"is_preprint":false},{"pmid":"34728318","id":"PMC_34728318","title":"SZAP exerts analgesic effects on rheumatalgia in CIA rats by suppressing pain hyperalgesia and inhibiting TRPV1 and P2X3.","date":"2021","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/34728318","citation_count":13,"is_preprint":false},{"pmid":"26221616","id":"PMC_26221616","title":"DC-Based Immunotherapy Combined with Low-Dose Methotrexate Effective in the Treatment of Advanced CIA in Mice.","date":"2015","source":"Journal of immunology research","url":"https://pubmed.ncbi.nlm.nih.gov/26221616","citation_count":13,"is_preprint":false},{"pmid":"33503415","id":"PMC_33503415","title":"Chk1 promotes non-homologous end joining in G1 through direct phosphorylation of ASF1A.","date":"2021","source":"Cell 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immunity","url":"https://pubmed.ncbi.nlm.nih.gov/29263111","citation_count":12,"is_preprint":false},{"pmid":"31780864","id":"PMC_31780864","title":"Systemic Resolvin E1 (RvE1) Treatment Does Not Ameliorate the Severity of Collagen-Induced Arthritis (CIA) in Mice: A Randomized, Prospective, and Controlled Proof of Concept Study.","date":"2019","source":"Mediators of inflammation","url":"https://pubmed.ncbi.nlm.nih.gov/31780864","citation_count":12,"is_preprint":false},{"pmid":"34688134","id":"PMC_34688134","title":"IgD promotes pannus formation by activating Wnt5A-Fzd5-CTHRC1-NF-κB signaling pathway in FLS of CIA rats and the regulation of IgD-Fc-Ig fusion protein.","date":"2021","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/34688134","citation_count":12,"is_preprint":false},{"pmid":"32222456","id":"PMC_32222456","title":"Small-molecule arone protects from neuroinflammation in LPS-activated microglia BV-2 cells by targeting histone-remodeling 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[et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/20582714","citation_count":11,"is_preprint":false},{"pmid":"33006176","id":"PMC_33006176","title":"Paeoniflorin-6'-o-benzene sulfonate (CP-25) improves vasculitis through inhibiting IL-17A/JAK/STAT3 signaling pathway in endothelial cells of HFD CIA rats.","date":"2020","source":"Phytotherapy research : PTR","url":"https://pubmed.ncbi.nlm.nih.gov/33006176","citation_count":11,"is_preprint":false},{"pmid":"30643526","id":"PMC_30643526","title":"Toll-Like Receptor 4-Myeloid Differentiation Primary Response Gene 88 Pathway Is Involved in the Shikonin Treatment of CIA by Regulating Treg/Th17 Expression.","date":"2018","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/30643526","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49957,"output_tokens":6485,"usd":0.123573},"stage2":{"model":"claude-opus-4-6","input_tokens":10166,"output_tokens":3781,"usd":0.218032},"total_usd":0.341605,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"ASF1a forms a physical complex with HIRA that is rate-limiting for formation of senescence-associated heterochromatin foci (SAHF) and onset of cellular senescence; ASF1a is required for incorporation of macroH2A and HP1 proteins into SAHF and for senescence-associated cell cycle exit, operating through a pathway that involves flux of heterochromatic proteins through PML nuclear bodies.\",\n      \"method\": \"Co-immunoprecipitation of HIRA-ASF1a complex; siRNA knockdown of ASF1a with SAHF formation and cell cycle exit as phenotypic readouts; immunofluorescence localization to PML bodies\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus loss-of-function with defined cellular phenotype, replicated across multiple labs\",\n      \"pmids\": [\"15621527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure (2.7 Å) of CIA-I (ASF1a) in complex with histones H3 and H4 shows that the C-terminal β-strand of histone H4 switches binding partner from histone H2A to ASF1a via a large conformational change; ASF1a has histone H3-H4 tetramer-disrupting activity in vitro, and mutants with weak H3-H4 dimer binding activity show critical functional effects on transcription-related cellular processes.\",\n      \"method\": \"X-ray crystallography; in vitro histone tetramer disruption assay; structure-guided mutagenesis with cellular functional readouts\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with in vitro functional assay and mutagenesis in a single study\",\n      \"pmids\": [\"17293877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the human ASF1a-HIRA heterodimer reveals that the HIRA B domain forms an antiparallel β-hairpin that binds perpendicular to the β-sandwich of ASF1a via β-sheet, salt bridge, and van der Waals contacts; the N- and C-terminal regions of ASF1a (but not ASF1b) determine preferential interaction with HIRA; CAF-1 p60 uses a B domain-like motif to compete with HIRA for binding to ASF1a.\",\n      \"method\": \"X-ray crystallography; biochemical competition assays (pull-down, ITC); mutational analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus biochemical dissection of binding specificity with mutagenesis\",\n      \"pmids\": [\"16980972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HIRA's translocation to PML nuclear bodies is required for SAHF formation (shown by dominant-negative HIRA mutants and PML-RARα disruption of PML bodies); downstream of PML body localization, the HIRA/ASF1a pathway acts in parallel with pRB to drive SAHF formation, with convergence occurring through the DNAJ-domain protein DNAJA2.\",\n      \"method\": \"Dominant-negative mutants blocking HIRA-PML colocalization; PML-RARα overexpression to disrupt PML bodies; genetic epistasis analysis with pRB and p53 loss-of-function; identification of DNAJA2 as convergence point\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic and cell biological approaches establishing pathway position\",\n      \"pmids\": [\"17242198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"UBN1 (human ortholog of yeast Hpc2p) is a component of the HIRA/ASF1a chromatin-remodeling complex; the Hpc2-related domain (HRD) of UBN1 directly interacts with the N-terminal WD repeats of HIRA; UBN1 binds proliferation-promoting genes repressed in senescence, associates with H3K9 methyltransferase activity, and is indispensable for SAHF formation.\",\n      \"method\": \"Co-immunoprecipitation of endogenous complex; recombinant protein binding assays; siRNA knockdown with SAHF formation readout; chromatin immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, ChIP, KD phenotype) in single study\",\n      \"pmids\": [\"19029251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CABIN1 is assembled into the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex via HIRA acting as a scaffold; HIRA interacts with CABIN1 at endogenous levels; CABIN1 is required for heterochromatinization of the senescent genome and co-regulates H3.3-enriched genes together with HIRA in proliferating cells.\",\n      \"method\": \"Endogenous and ectopic Co-immunoprecipitation; reconstitution of quaternary complex from recombinant proteins; mutational analysis of HIRA scaffold function; siRNA knockdown with chromatin phenotype readout\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstitution of quaternary complex plus reciprocal Co-IP and loss-of-function phenotype\",\n      \"pmids\": [\"21807893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ASF1a is required for post-repair restoration of histone H3K56 acetylation (H3K56Ac) following UV irradiation; restored H3K56Ac is needed for dephosphorylation of γ-H2AX and cellular recovery from checkpoint arrest; H3K56Ac restoration is regulated by ATM checkpoint kinase.\",\n      \"method\": \"siRNA knockdown of ASF1a; quantitative immunoblot of H3K56Ac, γ-H2AX; cell cycle checkpoint recovery assays; ATM inhibition epistasis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined molecular and cellular phenotype plus pathway epistasis\",\n      \"pmids\": [\"21727091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"UBN1 residues 41–77 (NHRD) form a tight 1:1 complex (nanomolar Kd) with the WD repeats of HIRA; this interaction is essential for assembly and stability of the HUCA complex in vitro and in vivo; key NHRD residues are required for HIRA interaction and chromatin organization in primary human cells.\",\n      \"method\": \"Analytical ultracentrifugation; mutational analysis; in vitro binding assays; cellular chromatin organization assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding with AUC quantification plus mutagenesis and cellular validation\",\n      \"pmids\": [\"22401310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ASF1a and ASF1b have undergone subfunctionalization after vertebrate gene duplication; regions outside the primary H3-H4 interaction surface (particularly N- and C-terminal regions carrying signatures of positive selection) determine the preferential interactions of ASF1a versus ASF1b with distinct H3-H4 chaperone complexes.\",\n      \"method\": \"Biochemical binding assays with purified proteins; structural analysis; evolutionary analysis with site-specific signatures of positive selection\",\n      \"journal\": \"Molecular biology and evolution\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical demonstration of differential binding specificity, moderate support from single study\",\n      \"pmids\": [\"23645555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ASF1a is required for maintenance of pluripotency and somatic cell reprogramming; ASF1a is specifically enriched in the metaphase II human oocyte; overexpression of ASF1a together with OCT4 and oocyte paracrine factor GDF9 is sufficient to reprogram human adult dermal fibroblasts to pluripotent cells.\",\n      \"method\": \"siRNA knockdown of ASF1a in reprogramming assay; ASF1a overexpression with OCT4 and GDF9; pluripotency marker assessment\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function and gain-of-function with defined pluripotency phenotype, single lab\",\n      \"pmids\": [\"25035411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Upon replication stress (doxorubicin), the ATR checkpoint kinase promotes degradation of ASF1a through the CRL1(βTRCP) ubiquitin-proteasome pathway, leading to dechromatinization and repression of genes overlapping clusters of stalled replication forks.\",\n      \"method\": \"Doxorubicin treatment; proteasome inhibitor rescue; CRL1(βTRCP) knockdown epistasis; ATR inhibition; ChIP for chromatin occupancy; ASF1a protein level assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing pathway: checkpoint kinase → ubiquitin ligase → ASF1a degradation → gene repression\",\n      \"pmids\": [\"24700029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"ASF1A-H3-H4 complex participates in CAF-1-dependent histone (H3-H4)₂ tetramer deposition during DNA replication; MutSα (MMR factor) inhibits CAF-1- and ASF1A-H3-H4-dependent packaging of a DNA mismatch into a tetrasome, indicating MMR acts before tetrasome formation; CAF-1/ASF1A-dependent tetramer deposition protects the discontinuous daughter strand from unnecessary degradation by MMR machinery.\",\n      \"method\": \"Reconstituted human in vitro MMR and nucleosome assembly systems; tetrasome assembly assay; strand degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — fully reconstituted in vitro system with mechanistic dissection\",\n      \"pmids\": [\"26945061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"sNASP contains at least two additional histone interaction sites beyond the competing TPR-H3 interface that are compatible with ASF1A binding, allowing formation of a quaternary sNASP-ASF1A-H3-H4 complex; sNASP makes a specific complex with H3 alone but not H4, suggesting it acts upstream of ASF1A; together, sNASP and ASF1A can fold an H3-H4 dimer in vitro.\",\n      \"method\": \"Monobody-aided protein interaction mapping; in vitro binding assays; native gel electrophoresis showing quaternary complex; histone folding assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted complexes with orthogonal biochemical assays demonstrating sequential chaperone action\",\n      \"pmids\": [\"28123037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ASF1a interacts with MDC1 and is recruited to double-strand break (DSB) sites where it facilitates the interaction of phospho-ATM with MDC1 and ATM-mediated phosphorylation of MDC1; this is required for recruitment of RNF8/RNF168 ubiquitin ligases, histone ubiquitination, 53BP1 recruitment, and NHEJ repair. This role is unique to ASF1a (not ASF1b) and does not require ASF1a's histone chaperone activity.\",\n      \"method\": \"Co-immunoprecipitation of ASF1a-MDC1 interaction; siRNA knockdown with laser-induced DSB foci as readout; NHEJ reporter assay; ATM kinase assay; ASF1a mutants lacking chaperone activity\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, clean KD with defined pathway readouts, domain mutant analysis distinguishing chaperone from repair functions\",\n      \"pmids\": [\"28943310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"USP52 is a bona fide deubiquitinase that physically associates with ASF1a, promotes its deubiquitination and stabilization, facilitating chromatin assembly and cell cycle progression; impairment of USP52-promoted ASF1a stabilization causes growth arrest and sensitizes breast cancer cells to DNA damage.\",\n      \"method\": \"Co-immunoprecipitation; in vitro deubiquitinase assay; knockdown with cell cycle and DNA damage phenotype readouts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro deubiquitinase activity demonstrated plus reciprocal Co-IP and functional cellular consequences\",\n      \"pmids\": [\"29599486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Asf1a is recruited to bivalent chromatin promoters (partially through association with transcription factors) and mediates nucleosome disassembly required for resolution of bivalent domains and activation of lineage-specific genes during mouse ES cell differentiation; the Asf1a-histone interaction (not its nucleosome assembly role) is required for gene transcription.\",\n      \"method\": \"Asf1a knockout mouse ES cells; ChIP-seq for Asf1a, H3K27me3, H3K4me3; nucleosome disassembly assay; domain mutants separating histone binding from assembly activity\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined molecular phenotype, ChIP evidence, mutant dissection of mechanism\",\n      \"pmids\": [\"29915027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ASF1a inhibition in tumor cells promotes immunogenic M1-like macrophage differentiation in the tumor microenvironment by upregulating GM-CSF expression, potentiating T-cell activation and sensitizing KRAS-mutant lung adenocarcinoma to anti-PD-1 therapy.\",\n      \"method\": \"In vivo CRISPR screen; Asf1a-knockout tumor cells; tumor microenvironment analysis; GM-CSF measurement; macrophage polarization assays; anti-PD-1 combination treatment\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO with defined pathway readout (GM-CSF upregulation → macrophage polarization), single study\",\n      \"pmids\": [\"31744829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ASF1a knockdown in wild-type p53-carrying cancer cells induces widespread DNA damage, robust upregulation of p53 and p21cip1 expression, and subsequent cellular senescence; p53 inhibition attenuates p21cip1 induction caused by ASF1a depletion, placing ASF1a upstream of p53-p21cip1 in the senescence pathway.\",\n      \"method\": \"siRNA knockdown; immunoblot for p53/p21; DNA damage markers (γ-H2AX); p53 inhibitor epistasis; SA-β-galactosidase senescence assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with pathway placement via epistasis, moderate support from single lab\",\n      \"pmids\": [\"30692519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The E2 ubiquitin-conjugating enzyme RAD6 cooperates with E3 ligase MDM2 to promote ubiquitination and proteasomal turnover of ASF1A; this RAD6-MDM2 ubiquitin ligase machinery is evolutionarily conserved (demonstrated in Drosophila and human cells).\",\n      \"method\": \"Co-immunoprecipitation in human and Drosophila cells; in vivo ubiquitination assays; MDM2 knockdown/overexpression; proteasome inhibitor rescue\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ubiquitination assay, single lab\",\n      \"pmids\": [\"26336826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In G1 phase, Chk1 activated by ATM at DNA double-strand breaks directly phosphorylates ASF1A at Ser-166; phospho-Ser-166 ASF1A interacts with MDC1 and enhances MDC1's interaction with ATM and stable localization of ATM at DSBs; Chk1 deficiency suppresses histone ubiquitination, 53BP1 foci, and NHEJ downstream of MDC1.\",\n      \"method\": \"In vitro kinase assay (Chk1 phosphorylation of ASF1A); phospho-specific antibody; Co-IP of phospho-ASF1A with MDC1; Chk1 inhibitor/knockdown with NHEJ reporter assay; G1 cell cycle synchronization\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay demonstrating direct phosphorylation plus cellular epistasis with pathway readouts\",\n      \"pmids\": [\"33503415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure (3.3 Å) of CIA/ASF1 in complex with the double bromodomain of CCG1/TAF1 reveals structural basis for their interaction; this interaction is required for colocalization of the two proteins, histone eviction, and RNA polymerase II entry at active promoter regions; the structure provides a mechanistic link between histone acetylation recognition by the bromodomain and ASF1-mediated histone eviction.\",\n      \"method\": \"X-ray crystallography; co-immunoprecipitation; chromatin immunoprecipitation of histone occupancy and Pol II; cellular colocalization assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with ChIP and functional cellular assays\",\n      \"pmids\": [\"20393127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ASF1A acts as a cofactor of histone acetyltransferase P300 to precisely regulate enrichment of histone H3K18 lactylation (H3K18la) at the SNAI1 promoter, thereby activating SNAI1 transcription and promoting endothelial-to-mesenchymal transition (EndMT); endothelium-specific deletion of Asf1a inhibits EndMT and alleviates atherosclerosis development in Apoe KO mice.\",\n      \"method\": \"Co-immunoprecipitation of ASF1A-P300 complex; ChIP for H3K18la at SNAI1 promoter; endothelium-specific Asf1a conditional knockout mouse (Apoe KO Asf1a ECKO) atherosclerosis model; PROTAC-mediated protein degradation\",\n      \"journal\": \"Acta pharmaceutica Sinica. B\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, ChIP, and in vivo KO with defined mechanistic and disease phenotype\",\n      \"pmids\": [\"39027248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Natural product artone directly binds ASF1a and modulates histone H3 post-translational modifications (decreasing acetylation and trimethylation at H3K4, H3K9, H3K18, K27), preventing NF-κB assembly at promoters of pro-inflammatory cytokine genes (Tnf-α, Il-6, Rgs3) in microglia.\",\n      \"method\": \"Direct binding assay (artone-ASF1a interaction); histone PTM mass spectrometry/immunoblot; ChIP for NF-κB at cytokine gene promoters; LPS-activated microglia model\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct binding demonstrated plus ChIP mechanistic readout, moderate support\",\n      \"pmids\": [\"32222456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Human CIA/ASF1 (hASF1) interacts with the two tandem bromodomain modules of hTAFII250/CCG1, the largest TFIID subunit; yeast Asf1p correspondingly interacts with Bdf1p (the missing bromodomain of yTAFII145); genetic interaction between ASF1 and BDF1 (synthetic lethality of double knockout; suppression of Spt phenotype by TFIID overexpression) establishes functional linkage between the histone chaperone and TFIID.\",\n      \"method\": \"GST pull-down; co-immunoprecipitation; yeast genetic synthetic lethality; Spt phenotype suppression assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal pull-down/Co-IP plus orthogonal genetic epistasis in yeast (ortholog)\",\n      \"pmids\": [\"12093919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HIRA (but not ASF1a) knockdown significantly reduces p53-mediated induction of large ALT-associated PML bodies and large HP1 foci in ALT cancer cells, demonstrating that HIRA has an ASF1a-independent role in HP1 localization to PML bodies; however, both HIRA and ASF1a colocalize inside PML bodies in normal fibroblasts approaching senescence.\",\n      \"method\": \"siRNA knockdown of HIRA vs. ASF1a; immunofluorescence of HP1, APB, PML body quantification; p53/p21 pathway activation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single KD comparison establishing differential pathway roles, moderate mechanistic specificity\",\n      \"pmids\": [\"21347226\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ASF1A is a histone H3-H4 chaperone that, structurally, binds an H3-H4 dimer via its β-sandwich domain displacing the H4 C-terminal strand from H2A, thereby disrupting H3-H4 tetramers; it operates as part of the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex—assembled through HIRA as a scaffold—to drive replication-independent H3.3 deposition, senescence-associated heterochromatin foci (SAHF) formation, and bivalent chromatin resolution during differentiation; independently of its chaperone activity, ATM-activated Chk1 phosphorylates ASF1A at Ser-166, enabling its interaction with MDC1 and promotion of NHEJ repair at double-strand breaks; its abundance is regulated by USP52-mediated deubiquitination and by ATR/CRL1(βTRCP)- and RAD6/MDM2-mediated ubiquitin-proteasome degradation; and it acts as a P300 cofactor to regulate H3K18 lactylation-dependent gene transcription.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ASF1A is a histone H3-H4 chaperone that disrupts H3-H4 tetramers via its β-sandwich domain and participates in both replication-coupled and replication-independent chromatin assembly as part of the quaternary HIRA/UBN1/CABIN1/ASF1a (HUCA) complex, functioning in senescence-associated heterochromatin foci (SAHF) formation, bivalent chromatin resolution during differentiation, and histone eviction at active promoters in concert with the TFIID subunit TAF1/CCG1 [PMID:15621527, PMID:17293877, PMID:21807893, PMID:29915027, PMID:20393127]. Independent of its histone chaperone activity, ATM-activated Chk1 phosphorylates ASF1A at Ser-166, enabling interaction with MDC1 to stabilize ATM at double-strand breaks and promote RNF8/RNF168-mediated histone ubiquitination, 53BP1 recruitment, and non-homologous end joining [PMID:28943310, PMID:33503415]. ASF1A protein abundance is regulated by USP52-mediated deubiquitination and by ATR/CRL1(βTRCP)- and RAD6/MDM2-dependent ubiquitin-proteasome degradation [PMID:29599486, PMID:24700029, PMID:26336826]. ASF1A also functions as a P300 cofactor directing H3K18 lactylation at specific promoters to activate transcription, with endothelial Asf1a deletion attenuating endothelial-to-mesenchymal transition and atherosclerosis in vivo [PMID:39027248].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that ASF1A physically and functionally links histone chaperoning to TFIID-dependent transcription resolved how a histone chaperone interfaces with the basal transcription machinery.\",\n      \"evidence\": \"GST pull-down and Co-IP of human ASF1a with TAF1/CCG1 bromodomains; synthetic lethality and Spt suppression in yeast orthologs\",\n      \"pmids\": [\"12093919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural detail of the ASF1a–TAF1 interface at this stage\", \"Unclear which histone PTMs gate the interaction in vivo\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating that the ASF1a–HIRA complex is rate-limiting for SAHF formation and senescence-associated cell cycle exit placed ASF1a in a defined chromatin-remodeling pathway controlling cellular senescence.\",\n      \"evidence\": \"Reciprocal Co-IP of HIRA–ASF1a; siRNA knockdown of ASF1a with SAHF and cell cycle exit readouts; immunofluorescence showing PML body flux\",\n      \"pmids\": [\"15621527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of additional HUCA subunits not yet known\", \"Mechanism of PML body transit unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The crystal structure of the ASF1a–HIRA B-domain heterodimer revealed the molecular basis for ASF1a's preferential partnership with HIRA over CAF-1, explaining paralog subfunctionalization at the structural level.\",\n      \"evidence\": \"X-ray crystallography; ITC and competition pull-downs; mutagenesis showing CAF-1 p60 competes via a B-domain-like motif\",\n      \"pmids\": [\"16980972\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full quaternary HUCA complex architecture unresolved\", \"No in vivo validation of competition dynamics\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The 2.7 Å crystal structure of ASF1a bound to H3-H4 established the mechanism of tetramer disruption: the H4 C-terminal β-strand switches from H2A to ASF1a, defining the core histone chaperone activity.\",\n      \"evidence\": \"X-ray crystallography; in vitro tetramer disruption assay; structure-guided mutagenesis with transcriptional readouts\",\n      \"pmids\": [\"17293877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ASF1a hands off H3-H4 dimers to downstream chaperones not yet reconstituted\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of UBN1 as an essential HUCA subunit that binds HIRA's WD repeats and targets senescence gene promoters expanded the complex from a dimer to a multi-subunit assembly with gene-specific chromatin roles.\",\n      \"evidence\": \"Co-IP of endogenous complex; recombinant binding assays; siRNA with SAHF readout; ChIP at proliferation genes\",\n      \"pmids\": [\"19029251\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CABIN1 not yet placed in the complex\", \"Stoichiometry uncertain\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The crystal structure of ASF1a with the TAF1 double bromodomain provided a structural mechanism linking histone acetylation recognition to ASF1a-mediated histone eviction and RNA Pol II entry at promoters.\",\n      \"evidence\": \"3.3 Å crystal structure; Co-IP; ChIP for histone occupancy and Pol II at active promoters\",\n      \"pmids\": [\"20393127\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide scope of ASF1a–TAF1-dependent promoter clearance not tested\", \"Kinetics of eviction in vivo unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Reconstitution of the quaternary HUCA complex (HIRA/UBN1/CABIN1/ASF1a) with HIRA as scaffold, and demonstration that ASF1a restores H3K56Ac post-UV damage for checkpoint recovery, expanded ASF1a's roles to both complex assembly and DNA damage recovery.\",\n      \"evidence\": \"Recombinant quaternary complex reconstitution; reciprocal Co-IP of CABIN1; siRNA of ASF1a with H3K56Ac, γ-H2AX, and checkpoint recovery readouts; ATM inhibition epistasis\",\n      \"pmids\": [\"21807893\", \"21727091\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How H3K56Ac restoration is coordinated with nucleosome reassembly in vivo\", \"Whether CABIN1 contributes to the DNA damage function\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that ATR triggers CRL1(βTRCP)-mediated proteasomal degradation of ASF1a during replication stress, and that ASF1a overexpression with OCT4/GDF9 suffices for somatic cell reprogramming, revealed regulated ASF1a turnover and a role in pluripotency.\",\n      \"evidence\": \"Doxorubicin-induced replication stress with proteasome inhibitor rescue and CRL1/ATR epistasis; ASF1a overexpression reprogramming assay with pluripotency markers\",\n      \"pmids\": [\"24700029\", \"25035411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degron motif on ASF1a for βTRCP not mapped\", \"Mechanism by which ASF1a enables reprogramming beyond chromatin remodeling unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Reconstituted systems showed ASF1A cooperates with CAF-1 for (H3-H4)₂ tetrasome deposition during DNA replication, and that sNASP acts upstream of ASF1A to fold H3-H4 dimers, defining the histone chaperone relay.\",\n      \"evidence\": \"Fully reconstituted in vitro MMR and nucleosome assembly; sNASP–ASF1A–H3–H4 quaternary complex by native gel; histone folding assay\",\n      \"pmids\": [\"26945061\", \"28123037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo order of hand-off from sNASP to ASF1A not confirmed\", \"How MMR factor MutSα signals to block ASF1A-dependent tetrasome deposition mechanistically\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"A chaperone-independent function of ASF1a in NHEJ was established: ASF1a interacts with MDC1 to facilitate phospho-ATM docking and downstream RNF8/RNF168 ubiquitination at DSBs, distinguishing its DNA repair role from histone chaperoning.\",\n      \"evidence\": \"Reciprocal Co-IP of ASF1a–MDC1; siRNA with laser-induced DSB foci; NHEJ reporter; chaperone-dead mutant retaining repair function\",\n      \"pmids\": [\"28943310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ASF1a–MDC1 interaction not resolved\", \"Phosphorylation event on ASF1a enabling this interaction not yet identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"USP52 was identified as the deubiquitinase stabilizing ASF1A, and Asf1a was shown to resolve bivalent chromatin domains during ES cell differentiation via nucleosome disassembly at lineage gene promoters, linking ASF1a turnover control and differentiation-specific chromatin dynamics.\",\n      \"evidence\": \"In vitro DUB assay for USP52; Co-IP; Asf1a KO mouse ES cells with ChIP-seq for bivalent marks; domain mutants separating histone binding from assembly\",\n      \"pmids\": [\"29599486\", \"29915027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether USP52 regulation of ASF1a is cell-cycle-dependent\", \"How ASF1a is recruited specifically to bivalent promoters\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of Chk1 phosphorylation of ASF1A at Ser-166 downstream of ATM in G1 closed the gap on how ASF1a is activated for its MDC1-dependent NHEJ role, completing the signaling cascade from DSB sensing to histone ubiquitination.\",\n      \"evidence\": \"In vitro Chk1 kinase assay; phospho-Ser166 antibody; Co-IP of phospho-ASF1A with MDC1; Chk1 inhibitor/KD with NHEJ reporter in G1-synchronized cells\",\n      \"pmids\": [\"33503415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional kinases phosphorylate ASF1A at other sites for repair\", \"Structural basis of phospho-Ser166 recognition by MDC1\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"ASF1A was shown to act as a P300 cofactor directing site-specific H3K18 lactylation at the SNAI1 promoter, establishing a non-canonical transcriptional regulatory function with in vivo relevance to endothelial-to-mesenchymal transition and atherosclerosis.\",\n      \"evidence\": \"Co-IP of ASF1A–P300; ChIP for H3K18la at SNAI1; endothelium-specific Asf1a conditional KO in Apoe-null atherosclerosis model\",\n      \"pmids\": [\"39027248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ASF1A–P300 co-regulation extends beyond SNAI1 to other lactylation targets\", \"Mechanism by which ASF1A directs P300 substrate specificity toward lactylation versus acetylation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for ASF1A's interaction with MDC1, the genome-wide scope of ASF1A-directed histone lactylation, and how ASF1A's chaperone-dependent and chaperone-independent functions are coordinately regulated across the cell cycle.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of ASF1A–MDC1 complex\", \"No genome-wide map of ASF1A-dependent H3K18 lactylation\", \"Cell-cycle-specific regulation of ASF1A phosphorylation, ubiquitination, and complex partitioning not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [1, 11, 12, 15]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [1, 12]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [21, 20, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [13, 19, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3, 13, 15, 19]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [0, 6, 15, 21]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [13, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1, 5, 11, 15, 21]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6, 13, 19]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 14, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [20, 21, 23]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [\n      \"HUCA (HIRA/UBN1/CABIN1/ASF1a)\",\n      \"sNASP-ASF1A-H3-H4\",\n      \"CAF-1/ASF1A-H3-H4\"\n    ],\n    \"partners\": [\n      \"HIRA\",\n      \"UBN1\",\n      \"CABIN1\",\n      \"MDC1\",\n      \"USP52\",\n      \"NASP\",\n      \"EP300\",\n      \"TAF1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}