{"gene":"NAP1L1","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1995,"finding":"Yeast NAP1 (ortholog of NAP1L1) is required for the mitotic cyclin Clb2 to carry out its full range of mitotic functions; in NAP1-deleted cells, Clb2/CDC28 kinase activity rises normally yet cells undergo prolonged delay at the short spindle stage, fail to switch from polar to isotropic bud growth, and show aberrant microtubule dynamics, demonstrating that NAP1 acts downstream of or in parallel to cyclin-CDK activation.","method":"Genetic deletion of NAP1 combined with Clb2 functional assays and cell-cycle phenotype analysis in S. cerevisiae","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple defined cellular phenotypes, replicated in follow-up studies","pmids":["7622567"],"is_preprint":false},{"year":1997,"finding":"Yeast NAP1 (ortholog of NAP1L1) physically associates with the kinase Gin4; NAP1 and the mitotic cyclin Clb2 together are required for phosphorylation and activation of Gin4, placing NAP1 in a pathway that links cyclin-CDK complexes to Gin4-dependent control of bud morphogenesis and mitotic progression.","method":"Affinity chromatography, in vivo phosphorylation assays, kinase activity assays, genetic epistasis in S. cerevisiae","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical binding confirmed by affinity chromatography plus in vivo phosphorylation and kinase assays","pmids":["9214386"],"is_preprint":false},{"year":1998,"finding":"NAP1L1 is a member of the TSPY-SET-NAP1L1 gene family; TSPYL genes were identified as novel members of this family by EST analysis and sequence homology, establishing the evolutionary relationships among NAP1L1, SET, and TSPY.","method":"EST sequence analysis, chromosomal localization, expression profiling","journal":"Cytogenetics and cell genetics","confidence":"Low","confidence_rationale":"Tier 4 — computational/sequence-based classification, no functional mechanistic data","pmids":["9730615"],"is_preprint":false},{"year":2003,"finding":"Deletion of yeast NAP1 (ortholog of NAP1L1) leads to genome-wide transcriptional changes (~10% of ORFs altered ≥2-fold) that are clustered along chromosomes, indicating NAP1 is required for maintenance of cumulative nucleosome formation in vivo and that loss of NAP1 disrupts local chromatin architecture.","method":"Genome-wide DNA microarray expression profiling of Δnap1 S. cerevisiae","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide functional readout in clean deletion strain, single lab","pmids":["12788058"],"is_preprint":false},{"year":2003,"finding":"Yeast NAP1 (ortholog of NAP1L1) shuttles between cytoplasm and nucleus; a putative nuclear export signal (NES) in yNap1 mediates its cytoplasmic localization, and NES-deletion mutants accumulate in the nucleus. Nucleocytoplasmic shuttling is required for NAP1 function in mitotic progression, as NES-lacking mutants fail to complement mitotic delay and temperature-sensitive growth phenotypes of NAP1-deleted strains.","method":"GFP localization, NES mutagenesis, complementation of nap1 deletion phenotypes in S. cerevisiae","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — direct localization by imaging combined with mutagenesis and functional complementation","pmids":["12944491"],"is_preprint":false},{"year":2007,"finding":"Yeast NAP1 (ortholog of NAP1L1) is phosphorylated in vivo at 11 sites; casein kinase 2 (CK2) phosphorylates three specific serine residues on NAP1. Phosphorylation of these serines by CK2 promotes nuclear import of NAP1 and is required for normal S-phase progression, as serine-to-alanine or serine-to-aspartate mutations both prolong S phase.","method":"Mass spectrometry identification of phosphorylation sites, in vitro CK2 kinase assays, alanine/aspartate mutagenesis, cell-cycle analysis in S. cerevisiae","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 — MS-identified sites validated by in vitro kinase assay and mutagenesis with functional readout","pmids":["18086883"],"is_preprint":false},{"year":2007,"finding":"The corepressor Alien binds NAP1 (ortholog of NAP1L1) in vivo and in vitro and enhances NAP1-mediated nucleosome assembly on DNA. Alien also reduces the accessibility of histones H3 and H4 for the NAP1-promoted assembly reaction, and both NAP1 and Alien localize to the endogenous CYP24 promoter, a VDR target gene, in vivo.","method":"Co-IP, GST pulldown, in vitro nucleosome assembly assay, chromatin immunoprecipitation and re-ChIP","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding confirmed by multiple methods plus in vitro functional assay and in vivo ChIP","pmids":["17339334"],"is_preprint":false},{"year":2007,"finding":"Excess NAP1 (ortholog of NAP1L1) added to H3/H4 shifts the tetramer–dimer equilibrium toward dimers, and H3/H4 dimers deposited on DNA form positively supercoiled DNA, whereas tetramers form negatively supercoiled DNA. NAP1 can also alter the conformational state of pre-bound H3/H4, suggesting a role in modulating chromatin topology during transcription.","method":"DNA supercoiling assays, formaldehyde crosslinking, DTNB modification of H3-Cys110, topoisomerase-relaxation assays in vitro","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 — rigorous in vitro reconstitution, single lab","pmids":["17595058"],"is_preprint":false},{"year":2008,"finding":"Yeast NAP1 (ortholog of NAP1L1) binds H2A/H2B and H3/H4 histone complexes with low nanomolar affinity; each NAP1 dimer binds two histone fold dimers. The NAP1 tails contribute synergistically to histone binding, whereas histone tails have a slightly repressive effect. The (H3/H4)₂ tetramer binds DNA with higher affinity than it binds NAP1, establishing a thermodynamic framework for histone exchange.","method":"Quantitative fluorescence-based binding assays, thermodynamic analysis of purified yNap1 and histone complexes in vitro","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — quantitative in vitro reconstitution with rigorous thermodynamic measurements","pmids":["18728017"],"is_preprint":false},{"year":2009,"finding":"Drosophila NAP1 (ortholog of NAP1L1) interacts with the RLAF silencing complex (comprising RPD3, LID/KDM5, SIN3A, PF1, EMSY, MRG15) and links it to the Su(H)/Hairless DNA-binding complex at NOTCH-regulated E(spl) genes. NAP1 directs high nucleosome density near E(spl) control elements and mediates both H3 deacetylation and H3K4me3 demethylation by RLAF, distinguishing its function from that of ASF1.","method":"Proteomics/mass spectrometry interaction network, co-IP, ChIP, nucleosome density analysis in Drosophila","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — proteomics-identified interactions validated by co-IP and ChIP with mechanistic readouts","pmids":["19782028"],"is_preprint":false},{"year":2009,"finding":"Yeast NAP1 (ortholog of NAP1L1) forms an RanGTP-insensitive import complex with Htz1/H2B and the karyopherin Kap114, facilitating nuclear import of the histone variant Htz1. NAP1 is required for maintaining a soluble cytoplasmic pool of Htz1, and NAP1 has Htz1-independent functions not shared by the chaperone Chz1.","method":"Copurification, nuclear import assays, RanGTP competition assays, genetic analysis in S. cerevisiae","journal":"Traffic","confidence":"High","confidence_rationale":"Tier 2 — biochemical copurification combined with functional import assays and genetic evidence","pmids":["19929865"],"is_preprint":false},{"year":2009,"finding":"HIV-1 Rev protein forms a stable complex with human nucleosome assembly protein 1 (Nap1, a NAP1L1-family member) through the Rev arginine-rich domain; Nap1 alters the oligomerization state of Rev in vitro. Overexpression of Nap1 stimulates Rev-mediated RNA export, reduces nucleolar localization of Rev, and affects Rev nuclear import rates.","method":"Tandem affinity purification (TAP), Rev affinity column retention, in vitro oligomerization assay, overexpression functional assays in human cells","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical interaction confirmed by multiple methods with functional consequence, single lab","pmids":["19339032"],"is_preprint":false},{"year":2010,"finding":"Yeast NAP1 (ortholog of NAP1L1) promotes nucleosome assembly by eliminating competing nonnucleosomal histone-DNA interactions; thermodynamic studies show NAP1 lowers the free energy barrier for nucleosome formation. Deletion of NAP1 in yeast results in a significant increase in atypical histone-DNA complexes and deregulated transcription activation and repression in vivo.","method":"In vitro thermodynamic nucleosome assembly assays (FRET, sedimentation), in vivo micrococcal nuclease assays in Δnap1 yeast, transcription reporter assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with thermodynamic quantification validated by in vivo genetic experiments","pmids":["20347425"],"is_preprint":false},{"year":2011,"finding":"Nap1 and the related chaperone Vps75 (both NAP1-family members, orthologs of NAP1L1) bind histones H3 and H4 in the tetrameric conformation as observed in the nucleosome. H3/H4 trapped in tetrameric state by these chaperones can be used as substrates for nucleosome assembly and chaperone-mediated lysine acetylation.","method":"Pulsed electron double resonance (PELDOR) measurements, protein crosslinking, in vitro nucleosome assembly, acetylation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — novel structural technique (PELDOR) combined with functional in vitro assays","pmids":["21329878"],"is_preprint":false},{"year":2012,"finding":"NAP1-assisted nucleosome assembly is a two-step process as measured at the single-molecule level: NAP1 and core histones first compact DNA, and nucleosomes are assembled with a characteristic change in linking number (~56 nm compaction per nucleosome). Non-nucleosomal H3/H4 binding does not produce the linking number change that complete nucleosome assembly generates.","method":"Single-molecule magnetic tweezers measuring DNA end-to-end length and linking number changes in real time","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — single-molecule reconstitution with quantitative mechanistic readout","pmids":["23050009"],"is_preprint":false},{"year":2013,"finding":"Nap1 (NAP1L1 ortholog) shields the histone H2A-H2B interaction surfaces used within the nucleosome, protecting them from promiscuous DNA interactions. Hydrogen-deuterium exchange MS reveals H2A-H2B α-helices sample partially disordered conformations at low ionic strength; Nap1 binding reduces this conformational sampling. Two copies of H2A-H2B bound to a Nap1 homodimer form a tetramer through H2B–H2B contacts resembling a four-helix bundle. The Nap1–H2A-H2B interaction surface is confirmed as functionally relevant both in vitro and in vivo.","method":"Hydrogen-deuterium exchange coupled to mass spectrometry (HDX-MS), mutagenesis, in vitro and in vivo functional validation","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — HDX-MS structural approach combined with mutagenesis and in vivo validation","pmids":["23973327"],"is_preprint":false},{"year":2013,"finding":"Drosophila NAP1 (ortholog of NAP1L1) is required for cohesin release and sister chromatid resolution during mitosis. NAP1 associates with the full cohesin complex and also forms a separate complex with the cohesin subunit SA/stromalin. NAP1 binding to cohesin is cell-cycle regulated, increasing in G2/M; this causes dissociation of PP2A from cohesin, increased SA phosphorylation, and cohesin removal. The balanced antagonism between NAP1 and PP2A controls mitotic cohesin dissociation.","method":"Proteomics, co-IP, genome-wide ChIP-seq (NAP1 and cohesin co-localization), genetic rescue experiments in Drosophila","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (proteomics, co-IP, ChIP, genetics) in a single rigorous study","pmids":["24086141"],"is_preprint":false},{"year":2013,"finding":"Yeast Nap1 (NAP1L1 ortholog) and Vps75 regulate histone H3-K9 acetylation during transcription elongation by modulating Rtt109 acetyltransferase activity. Loss of NAP1 suppresses cryptic transcription within ORFs seen in ctk1 deletion strains and reduces H3-K9 acetylation at the STE11 ORF, indicating Nap1 regulates Rtt109-dependent chromatin acetylation during elongation.","method":"Genetic suppression analysis, ChIP for histone modifications, genetic interactions in S. cerevisiae","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with ChIP validation, single lab","pmids":["23401858"],"is_preprint":false},{"year":2014,"finding":"NAP1L1 silencing (siRNA/shRNA) in pancreatic neuroendocrine neoplasm cells decreases proliferation by inhibiting mTOR pathway proteins and their phosphorylation. NAP1L1 binds directly to the p57(Kip2)/CDKN1C promoter (by ChIP, region -164 to +21) and promotes its methylation, thereby silencing p57(Kip2) expression. NAP1L1 knockdown reduces p57(Kip2) promoter methylation and upregulates p57(Kip2) transcript and protein, establishing NAP1L1 as an epigenetic regulator of the CDKN1C tumor suppressor.","method":"siRNA/shRNA knockdown, chromatin immunoprecipitation (ChIP) of NAP1L1 at CDKN1C promoter, bisulfite methylation analysis, mTOR pathway Western blotting, orthotopic mouse tumor model","journal":"Epigenetics & chromatin","confidence":"High","confidence_rationale":"Tier 2 — direct ChIP evidence of promoter binding combined with methylation analysis, functional knockdown in vitro and in vivo","pmids":["25071868"],"is_preprint":false},{"year":2014,"finding":"Nap1 (NAP1L1 ortholog) accumulates at DNA double-strand break (DSB) sites in human cells and DSB repair is substantially decreased in Nap1-knockdown cells. Nap1 binds RAD54, enhances RAD54-mediated nucleosome remodeling by evicting linker histone H1, and stimulates RAD51-mediated homologous pairing in higher-ordered chromatin containing histone H1.","method":"ChIP at DSB sites, siRNA knockdown DSB repair assay, in vitro RAD51/RAD54 homologous pairing assay with reconstituted chromatin, H1 eviction assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of HR in defined chromatin combined with cell-based DSB repair assays","pmids":["24798879"],"is_preprint":false},{"year":2015,"finding":"Xenopus Nap1 (ortholog of NAP1L1) associates with the embryonic linker histone H1M in egg extracts; immunodepletion of Nap1 decreases H1M binding to mitotic chromosomes by ~50%, reduces H1M dynamics (FRAP), and causes chromosome decondensation similar to H1M depletion. Glutamylation of Nap1 (posttranslational modification) is required for proper H1M deposition; a glutamylation-deficient Nap1 mutant fails to rescue H1M dynamics or chromosome condensation, demonstrating that charge-shifting glutamylation of Nap1 controls linker histone dynamics essential for chromosome architecture.","method":"Xenopus egg extract immunodepletion, FRAP, chromosome condensation assays, add-back of wild-type vs. glutamylation-mutant Nap1","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — immunodepletion/rescue with PTM-mutant in reconstituted system with multiple functional readouts","pmids":["25897082"],"is_preprint":false},{"year":2016,"finding":"Yeast Nap1 (NAP1L1 ortholog) is a major regulator of H2A-H2B dynamics at the GAL locus: in NAP1-deleted cells, H2A-H2B accumulates at the repressed GAL locus on linker DNA independent of DNA sequence preference, and upon transcriptional activation H2A-H2B levels are further depleted in a NAP1-dependent manner. Nap1 is specifically required for transcription-dependent H2A-H2B exchange.","method":"ChIP for H2A-H2B and H3-H4 in Δnap1 vs. WT cells, in vivo histone exchange assay at GAL locus, in vitro nucleosome reconstitutions","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — combined in vivo ChIP and in vivo exchange assays with in vitro reconstitution, single rigorous study","pmids":["26884462"],"is_preprint":false},{"year":2017,"finding":"NAP1L1 directly interacts with the ATP-dependent chromatin remodeler CSB (Cockayne syndrome protein B) and enhances CSB-mediated nucleosome remodeling. At the single-molecule level, NAP1L1 suppresses non-productive DNA-binding by CSB, accelerates both the activation and translocation phases of remodeling, and decreases the probability of CSB pausing during translocation, thereby increasing CSB processivity. This defines NAP1L1 as a regulatory cofactor that stimulates transcription-coupled nucleotide excision repair (TC-NER) by enhancing CSB remodeling activity.","method":"Single-molecule FRET (smFRET) and total internal reflection fluorescence microscopy to monitor CSB–DNA interactions and nucleosome remodeling in real time; in vitro reconstitution with purified NAP1L1 and CSB","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — single-molecule reconstitution with multiple mechanistic readouts (activation, translocation, pausing phases), directly studies NAP1L1","pmids":["28369616"],"is_preprint":false},{"year":2017,"finding":"HCV NS5A protein interacts with NAP1L1 and sequesters it in the cytoplasm, blocking NAP1L1 nuclear translocation. NS5A from genotype 2 (but not genotype 1) additionally targets NAP1L1 for proteasome-mediated degradation. Loss of NAP1L1 leads to decreased RELA protein levels and strongly impairs IRF3 phosphorylation by TBK1/IKKε, resulting in defective RIG-I and TLR3 antiviral signaling responses.","method":"Co-IP of NS5A and NAP1L1, domain mapping, subcellular fractionation, siRNA knockdown of NAP1L1, Western blotting for RELA and p-IRF3, RIG-I/TLR3 reporter assays in human hepatoma cells","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 — binding mapped by domain deletions, subcellular localization by fractionation, functional consequence established by knockdown with multiple pathway readouts, directly studies NAP1L1","pmids":["28659470"],"is_preprint":false},{"year":2018,"finding":"NAP1L1 promotes proliferation of renal cancer cells partly through a KRAS-NAP1L1/P-ERK/ETS1 positive feedback axis; miR-532-5p directly targets both KRAS and NAP1L1 to suppress this pathway. ETS1 suppresses miR-532-5p transcription by binding its promoter, creating a feedback loop. Overexpression of NAP1L1 rescues the anti-proliferative effect of miR-532-5p.","method":"Luciferase reporter assay (3'UTR targeting), chromatin immunoprecipitation (ETS1 at miR-532-5p promoter), Western blotting for P-ERK, overexpression rescue experiments in RCC cells","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 — direct 3'UTR targeting validated by luciferase, ChIP for transcription factor binding, functional rescue; pathway placement is indirect","pmids":["30082686"],"is_preprint":false},{"year":2018,"finding":"NAP1L1 is required for neural progenitor cell (NPC) proliferation and restraint of premature neuronal differentiation during cortical development. Nap1l1 knockdown and CRISPR-Cas9 knockout in mice decreases NPC proliferation and induces premature neuronal differentiation. RNA-seq identifies RassF10 as a downstream target; Nap1l1 promotes SETD1A-mediated H3K4 trimethylation at the RassF10 promoter to maintain RassF10 expression, and RassF10 overexpression rescues Nap1l1 KO neurogenesis defects.","method":"In utero electroporation knockdown, CRISPR-Cas9 knockout mice, RNA-seq, ChIP for H3K4me3 at RassF10 promoter, RassF10 rescue experiments","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — KO mouse plus in vivo rescue with epistasis established by RassF10 overexpression; ChIP links NAP1L1 to H3K4me3 at target promoter","pmids":["29490266"],"is_preprint":false},{"year":2018,"finding":"PRDM8 (a PR domain protein) suppresses NAP1L1 expression in hepatocellular carcinoma cells; NAP1L1 activates the PI3K/AKT/mTOR signaling cascade, and PRDM8-mediated inhibition of HCC growth and metastasis is mediated through downregulation of NAP1L1.","method":"Lentiviral overexpression/knockdown of PRDM8, Western blotting for PI3K/AKT/mTOR phospho-proteins, rescue by NAP1L1 re-expression, in vivo tumor model","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement by Western blot and rescue, no direct biochemical interaction between PRDM8 and NAP1L1 shown","pmids":["29572888"],"is_preprint":false},{"year":2018,"finding":"lncRNA CDKN2B-AS1 promotes NAP1L1 expression by sponging miR-let-7c-5p; elevated NAP1L1 activates PI3K/AKT/mTOR signaling in HCC cells. NAP1L1 restoration abolishes the anti-proliferative and anti-metastatic effects of CDKN2B-AS1 knockdown, placing NAP1L1 downstream of the CDKN2B-AS1/let-7c-5p axis as a positive regulator of PI3K/AKT/mTOR.","method":"siRNA knockdown, luciferase reporter for miRNA sponging, Western blotting for p-AKT/p-mTOR, NAP1L1 rescue overexpression in HCC cells","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 3 — pathway placement by Western blot with functional rescue; mechanistic link between NAP1L1 and PI3K/AKT/mTOR is inferred, not directly biochemically shown","pmids":["30165194"],"is_preprint":false},{"year":2019,"finding":"Yeast Nap1 (NAP1L1 ortholog) serves as a dedicated ribosomal protein chaperone for Rps6 (small ribosomal subunit protein 6); Nap1 promotes solubility of Rps6 in vitro and interacts with a large, mostly eukaryote-specific binding surface of Rps6. Deletion of NAP1 enhances 40S synthesis defects of Rps6 mutants, demonstrating a co-evolutionary role of Nap1 in ribosome biogenesis beyond histone chaperoning.","method":"Tandem-affinity purification screen, in vitro solubility assay for r-proteins, genetic interaction analysis in S. cerevisiae","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 — AP-based screen with in vitro solubility validation and genetic interaction; single lab","pmids":["31062022"],"is_preprint":false},{"year":2019,"finding":"NAP1 (histone chaperone, NAP1L1 ortholog) mediates gene-specific eviction of linker histone H1 through a transcriptional activator→p300→NAP1→H1 pathway. In H1-compacted chromatin reconstituted in vitro, NAP1 is recruited by activator-bound p300 through direct interaction; NAP1 then facilitates core histone acetylation by p300 and concomitantly evicts H1 and H2A-H2B to enable transcription. In B cells, NAP1-mediated H1 eviction is required for induction of the CD40 gene.","method":"In vitro chromatin transcription reconstitution, co-IP of NAP1 with p300 and activators, H1 eviction assay, B cell CD40 gene induction assays with NAP1 depletion","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro chromatin reconstitution plus co-IP and cell-based gene induction assays with multiple orthogonal methods","pmids":["30902546"],"is_preprint":false},{"year":2021,"finding":"NAP1L1 interacts with hepatoma-derived growth factor (HDGF) at the protein level; they co-localize in the cytoplasm. HDGF in turn interacts with the transcription factor c-Jun, which induces expression of cell cycle promoters CCND1/CDK4/CDK6. Knockdown of NAP1L1 in glioma cells inhibits proliferation and sensitizes cells to cisplatin, and this effect is reversed by HDGF overexpression, placing NAP1L1 upstream of the HDGF/c-Jun/CCND1 axis.","method":"Co-immunoprecipitation of NAP1L1 and HDGF, immunofluorescence co-localization, siRNA knockdown, Western blotting for CCND1/CDK4/CDK6, HDGF rescue overexpression, in vivo tumor model","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP and co-localization with functional rescue; pathway is inferred from downstream markers","pmids":["34959221"],"is_preprint":false},{"year":2022,"finding":"NAP1L1 interacts with HDGF in ovarian cancer cells (co-IP and immunofluorescence); HDGF recruits c-Jun to induce CCND1 expression, promoting G1/S progression. NAP1L1 knockdown blocks G1/S transition and induces apoptosis, and HDGF overexpression in NAP1L1-knockdown cells restores proliferation, confirming the NAP1L1→HDGF→c-Jun→CCND1 proliferative axis.","method":"Co-immunoprecipitation, immunofluorescence, siRNA/shRNA knockdown, flow cytometry cell cycle analysis, HDGF rescue in SKOV3/OVCAR3 cells","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP confirmed interaction with functional rescue; replicates glioma findings in a different cancer type","pmids":["35351053"],"is_preprint":false}],"current_model":"NAP1L1 (and its well-characterized orthologs) functions as a histone chaperone that (i) binds H2A-H2B and H3/H4 with nanomolar affinity to prevent nonnucleosomal histone-DNA interactions and facilitate nucleosome assembly/disassembly in a two-step process, (ii) evicts linker histone H1 via recruitment to activator-bound p300 to enable gene-specific transcription, (iii) promotes CSB-mediated nucleosome remodeling during transcription-coupled DNA repair by suppressing non-productive DNA binding and reducing remodeler pausing, (iv) is regulated by CK2-mediated phosphorylation that promotes its nuclear import, and by glutamylation that modulates linker histone dynamics, (v) controls cohesin release and sister chromatid resolution during mitosis by antagonizing PP2A, and (vi) in mammalian cells regulates neural progenitor proliferation through SETD1A-mediated H3K4me3 at the RassF10 promoter, epigenetically silences CDKN1C/p57(Kip2) to promote tumor cell proliferation, interacts with HDGF to activate c-Jun/CCND1/CDK4/CDK6 signaling, and is targeted by HCV NS5A to suppress antiviral IRF3/TBK1 signaling."},"narrative":{"teleology":[{"year":1995,"claim":"Establishing that NAP1 functions in mitotic progression beyond histone chaperoning resolved the question of whether NAP1 acts solely as a nucleosome assembly factor, revealing it is required for cyclin Clb2-dependent mitotic functions including spindle elongation and bud morphogenesis.","evidence":"NAP1 deletion in S. cerevisiae combined with Clb2 functional assays and cell-cycle phenotyping","pmids":["7622567"],"confidence":"High","gaps":["Mechanism by which NAP1 enables Clb2 mitotic functions was unclear","No direct binding between NAP1 and Clb2/CDC28 demonstrated"]},{"year":1997,"claim":"Discovery that NAP1 physically associates with the kinase Gin4 and together with Clb2 activates Gin4 phosphorylation established NAP1 as a scaffold linking cyclin-CDK complexes to downstream mitotic kinase cascades.","evidence":"Affinity chromatography, in vivo phosphorylation and kinase assays, genetic epistasis in S. cerevisiae","pmids":["9214386"],"confidence":"High","gaps":["Whether NAP1 serves as a kinase substrate or purely as a scaffold was unresolved","Relevance to mammalian NAP1L1 not tested"]},{"year":2003,"claim":"Demonstration that NAP1 deletion causes genome-wide transcriptional changes clustered along chromosomes, combined with the finding that NAP1 shuttles between cytoplasm and nucleus via a functional NES required for mitotic function, established that nucleocytoplasmic trafficking is essential for NAP1's chromatin-regulatory role.","evidence":"Microarray profiling of Δnap1 yeast; GFP localization, NES mutagenesis, and complementation assays in S. cerevisiae","pmids":["12788058","12944491"],"confidence":"High","gaps":["Whether the transcriptional changes reflect direct nucleosome assembly defects or indirect effects was unknown","Nuclear import mechanism not yet identified"]},{"year":2007,"claim":"Three advances defined NAP1's biochemical mechanism: CK2 phosphorylation at three serines promotes nuclear import and S-phase progression; NAP1 modulates H3/H4 tetramer-dimer equilibrium to alter DNA supercoiling topology; and the corepressor Alien enhances NAP1-mediated nucleosome assembly at specific promoters.","evidence":"MS-based phosphosite mapping with CK2 kinase assays and mutagenesis in yeast; DNA supercoiling and crosslinking assays in vitro; co-IP, GST pulldown, ChIP, and nucleosome assembly assays","pmids":["18086883","17595058","17339334"],"confidence":"High","gaps":["How CK2-phosphorylated NAP1 is recognized by the nuclear import machinery was unknown","Whether H3/H4 tetramer-dimer modulation occurs in vivo was untested"]},{"year":2008,"claim":"Quantitative measurement of NAP1-histone binding affinities (low nM for both H2A-H2B and H3-H4, two histone fold dimers per NAP1 dimer) established the thermodynamic framework explaining how histones transfer from chaperone to DNA during nucleosome assembly.","evidence":"Quantitative fluorescence-based binding assays with purified yeast Nap1 and histone complexes","pmids":["18728017"],"confidence":"High","gaps":["Binding affinities for human NAP1L1 not measured","Kinetic rates of histone transfer not determined"]},{"year":2009,"claim":"Two studies expanded NAP1's functional repertoire: in Drosophila, NAP1 links the RLAF silencing complex to Notch-target genes by directing high nucleosome density and coordinating H3 deacetylation/H3K4me3 demethylation; in yeast, NAP1 forms a RanGTP-insensitive import complex with the histone variant Htz1/H2B and karyopherin Kap114 for Htz1 nuclear import.","evidence":"Proteomics, co-IP, ChIP, nucleosome density analysis in Drosophila; copurification and nuclear import assays with RanGTP competition in S. cerevisiae","pmids":["19782028","19929865"],"confidence":"High","gaps":["Whether RLAF-NAP1 interaction occurs in mammalian cells was unknown","How NAP1 discriminates Htz1 from canonical H2A was unclear"]},{"year":2010,"claim":"Thermodynamic reconstitution proved that NAP1 promotes nucleosome assembly not by actively depositing histones but by eliminating competing nonnucleosomal histone-DNA complexes, lowering the free energy barrier to correct nucleosome formation.","evidence":"FRET, sedimentation, MNase assays in Δnap1 yeast, and transcription reporters","pmids":["20347425"],"confidence":"High","gaps":["Whether other chaperones share this thermodynamic mechanism was not tested","Contribution of individual histone pairs to the energy barrier was unresolved"]},{"year":2011,"claim":"Structural studies using PELDOR spectroscopy resolved a long-standing question by showing NAP1-family chaperones bind H3-H4 as a tetramer (not dimers), and this tetrameric substrate can be used for nucleosome assembly and chaperone-mediated acetylation.","evidence":"Pulsed electron double resonance, protein crosslinking, in vitro nucleosome assembly and acetylation assays","pmids":["21329878"],"confidence":"High","gaps":["Full structural model of NAP1-H3/H4 tetramer complex not available","Whether tetramer vs. dimer mode is regulated in vivo was unknown"]},{"year":2012,"claim":"Single-molecule magnetic tweezers revealed nucleosome assembly by NAP1 proceeds in two kinetic steps—initial DNA compaction followed by canonical nucleosome formation with a characteristic linking number change—providing a real-time mechanistic framework.","evidence":"Single-molecule magnetic tweezers measuring DNA extension and linking number","pmids":["23050009"],"confidence":"High","gaps":["Whether the two-step pathway applies to all histone variants was untested","Rate-limiting step not identified"]},{"year":2013,"claim":"Three discoveries in 2013 deepened understanding of NAP1's histone-shielding, mitotic, and transcription-elongation functions: HDX-MS showed NAP1 shields H2A-H2B interaction surfaces and organizes two H2A-H2B copies into a pseudo-tetramer; in Drosophila, NAP1 controls mitotic cohesin release by displacing PP2A from cohesin in a cell-cycle-regulated manner; and in yeast, NAP1 modulates Rtt109-dependent H3K9 acetylation during transcription elongation to suppress cryptic transcription.","evidence":"HDX-MS with mutagenesis and in vivo validation; proteomics, co-IP, ChIP-seq, and genetic rescue in Drosophila; genetic suppression and ChIP in S. cerevisiae","pmids":["23973327","24086141","23401858"],"confidence":"High","gaps":["Structural basis of NAP1-PP2A antagonism on cohesin was unknown","Whether NAP1's elongation role is conserved in mammals was untested"]},{"year":2014,"claim":"Two studies demonstrated direct roles in mammalian DNA repair and tumor biology: NAP1L1 accumulates at DSB sites, binds RAD54, and enhances homologous recombination by evicting H1 from higher-order chromatin; separately, NAP1L1 binds the CDKN1C/p57 promoter and promotes its methylation-mediated silencing, driving pancreatic neuroendocrine tumor proliferation.","evidence":"ChIP at DSBs, siRNA knockdown repair assay, in vitro RAD51/RAD54 HR reconstitution; ChIP of NAP1L1 at CDKN1C promoter, bisulfite methylation, orthotopic tumor model","pmids":["24798879","25071868"],"confidence":"High","gaps":["Which DNA methyltransferase NAP1L1 recruits to CDKN1C was unknown","Whether NAP1L1's HR function requires its histone chaperone activity or is a distinct activity was unresolved"]},{"year":2015,"claim":"Discovery that glutamylation of NAP1 is required for linker histone H1 dynamics and mitotic chromosome condensation in Xenopus established post-translational charge modification as a regulatory switch controlling NAP1's histone chaperone activity.","evidence":"Immunodepletion and add-back of wild-type vs. glutamylation-mutant Nap1 in Xenopus egg extracts, FRAP, chromosome condensation assays","pmids":["25897082"],"confidence":"High","gaps":["Identity of the glutamylase and deglutamylase acting on NAP1L1 was unknown","Whether glutamylation regulates NAP1 in interphase was not addressed"]},{"year":2017,"claim":"Single-molecule FRET studies showed NAP1L1 enhances CSB chromatin remodeling by suppressing non-productive DNA binding and reducing remodeler pausing, establishing NAP1L1 as a cofactor for transcription-coupled nucleotide excision repair; separately, HCV NS5A was shown to sequester NAP1L1 in the cytoplasm (and degrade it in genotype 2), impairing IRF3/TBK1 antiviral signaling.","evidence":"smFRET and TIRF microscopy with purified NAP1L1/CSB; co-IP, domain mapping, subcellular fractionation, siRNA knockdown with pathway readouts in hepatoma cells","pmids":["28369616","28659470"],"confidence":"High","gaps":["Whether NAP1L1 enhances other chromatin remodelers besides CSB was untested","Mechanism by which NAP1L1 loss reduces RELA levels was unclear"]},{"year":2018,"claim":"NAP1L1's developmental and oncogenic roles were elaborated: in cortical development, NAP1L1 maintains neural progenitor proliferation by promoting SETD1A-dependent H3K4me3 at the RassF10 promoter; in cancer, NAP1L1 activates PI3K/AKT/mTOR signaling and participates in a KRAS/P-ERK/ETS1 positive feedback loop.","evidence":"CRISPR-KO mice, in utero electroporation, ChIP for H3K4me3, RassF10 rescue; luciferase 3'UTR assays, ChIP for ETS1, Western blotting in RCC and HCC cells","pmids":["29490266","30082686","29572888"],"confidence":"High","gaps":["Direct physical interaction between NAP1L1 and SETD1A was not demonstrated","How NAP1L1 activates PI3K/AKT/mTOR at the biochemical level remains unknown"]},{"year":2019,"claim":"Two conceptual advances: in vitro chromatin reconstitution showed NAP1 is recruited by activator-bound p300 to evict linker histone H1 and enable gene-specific transcription (validated at the CD40 locus in B cells); separately, yeast Nap1 was shown to serve as a dedicated ribosomal protein chaperone for Rps6, extending its chaperone repertoire beyond histones.","evidence":"In vitro chromatin transcription system, co-IP of NAP1 with p300, B cell CD40 induction; TAP screen, in vitro solubility assay, genetic interaction in yeast","pmids":["30902546","31062022"],"confidence":"High","gaps":["Whether Rps6 chaperoning is conserved in mammalian NAP1L1 was not tested","The structural basis of NAP1-p300 interaction was unknown"]},{"year":2021,"claim":"Independent studies in glioma and ovarian cancer identified a NAP1L1→HDGF→c-Jun→CCND1/CDK4/CDK6 proliferative axis, with co-IP confirming direct NAP1L1-HDGF interaction and HDGF rescue reversing NAP1L1 knockdown effects, establishing a non-chromatin oncogenic signaling role.","evidence":"Co-IP, immunofluorescence co-localization, siRNA knockdown, HDGF rescue, in vivo tumor model in glioma (2021) and ovarian cancer (2022) cells","pmids":["34959221","35351053"],"confidence":"Medium","gaps":["Whether NAP1L1-HDGF interaction requires NAP1L1's histone-binding domain was untested","Direct mechanism linking NAP1L1 to HDGF activation of c-Jun is unclear","Findings from cancer cell lines without genetic validation"]},{"year":null,"claim":"Major open questions include: the structural basis of NAP1L1 interactions with non-histone partners (p300, CSB, HDGF, cohesin), the mechanism by which NAP1L1 directs DNA methyltransferase activity to the CDKN1C promoter, whether its ribosomal protein chaperone function is conserved in mammals, and how post-translational modifications (CK2 phosphorylation, glutamylation) are coordinated to partition NAP1L1 among its diverse nuclear and cytoplasmic functions.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length NAP1L1 with any partner complex","Integration of chromatin vs. non-chromatin functions is unexplored","In vivo significance of many cancer-context findings requires genetic models"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[8,12,13,14,15,21]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[12,13,28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,22,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,5,19,20,25]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,23,30]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[16,20]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[3,7,8,12,14,15,21,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,5,16]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[19,22]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[9,17,25,29]}],"complexes":["RLAF complex"],"partners":["CSB","RAD54","HDGF","P300","KAP114","GIN4","ALIEN"],"other_free_text":[]},"mechanistic_narrative":"NAP1L1 is a histone chaperone that facilitates nucleosome assembly and disassembly by binding H2A-H2B and H3-H4 with nanomolar affinity, shielding histone interaction surfaces from nonproductive DNA contacts and lowering the thermodynamic barrier to nucleosome formation in a two-step process [PMID:18728017, PMID:20347425, PMID:23973327, PMID:23050009]. Beyond canonical nucleosome assembly, NAP1L1 evicts linker histone H1 through recruitment by activator-bound p300 to enable gene-specific transcription [PMID:30902546], enhances CSB-mediated nucleosome remodeling during transcription-coupled DNA repair [PMID:28369616], stimulates RAD54/RAD51-dependent homologous recombination by evicting H1 from higher-order chromatin at double-strand breaks [PMID:24798879], and controls cohesin release during mitosis by antagonizing PP2A-mediated dephosphorylation of the cohesin subunit SA [PMID:24086141]. CK2 phosphorylation promotes its nuclear import for S-phase functions [PMID:18086883], and glutamylation regulates its control of linker histone dynamics on mitotic chromosomes [PMID:25897082]. In mammalian cells, NAP1L1 maintains neural progenitor proliferation via SETD1A-mediated H3K4me3 at the RassF10 promoter [PMID:29490266] and promotes tumor cell proliferation through epigenetic silencing of the CDKN1C/p57 tumor suppressor [PMID:25071868] and activation of a HDGF/c-Jun/CCND1 signaling axis [PMID:34959221, PMID:35351053]."},"prefetch_data":{"uniprot":{"accession":"P55209","full_name":"Nucleosome assembly protein 1-like 1","aliases":["Histone H2A-H2B chaperone NAP1L1","NAP-1-related protein","hNRP"],"length_aa":391,"mass_kda":45.4,"function":"Histone chaperone that plays a role in the nuclear import of H2A-H2B and nucleosome assembly (PubMed:20002496, PubMed:21211722, PubMed:26841755). Also participates in several important DNA repair mechanisms: greatly enhances ERCC6-mediated chromatin remodeling which is essential for transcription-coupled nucleotide excision DNA repair (PubMed:28369616). Also stimulates homologous recombination (HR) by RAD51 and RAD54 which is essential in mitotic DNA double strand break (DSB) repair (PubMed:24798879). Plays a key role in the regulation of embryonic neurogenesis (By similarity). Promotes the proliferation of neural progenitors and inhibits neuronal differentiation during cortical development (By similarity). Regulates neurogenesis via the modulation of RASSF10; regulates RASSF10 expression by promoting SETD1A-mediated H3K4 methylation at the RASSF10 promoter (By similarity) (Microbial infection) Positively regulates Epstein-Barr virus reactivation in epithelial cells through the induction of viral BZLF1 expression (Microbial infection) Together with human herpesvirus 8 protein LANA1, assists the proper assembly of the nucleosome on the replicated viral DNA","subcellular_location":"Nucleus; Chromosome; Melanosome; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P55209/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NAP1L1","classification":"Not Classified","n_dependent_lines":12,"n_total_lines":1208,"dependency_fraction":0.009933774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"IPO5","stoichiometry":4.0},{"gene":"RPL5","stoichiometry":4.0},{"gene":"BYSL","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"H1F0","stoichiometry":0.2},{"gene":"HIST2H2BE","stoichiometry":0.2},{"gene":"IPO7","stoichiometry":0.2},{"gene":"MYO1B","stoichiometry":0.2},{"gene":"MYO9B","stoichiometry":0.2},{"gene":"RBM39","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NAP1L1","total_profiled":1310},"omim":[{"mim_id":"618738","title":"TUBULIN TYROSINE LIGASE-LIKE 4; TTLL4","url":"https://www.omim.org/entry/618738"},{"mim_id":"612203","title":"NUCLEOSOME ASSEMBLY PROTEIN 1-LIKE 5; NAP1L5","url":"https://www.omim.org/entry/612203"},{"mim_id":"604714","title":"TSPY-LIKE 1; TSPYL1","url":"https://www.omim.org/entry/604714"},{"mim_id":"602820","title":"HISTONE GENE CLUSTER 3, H3 HISTONE; HIST3H3","url":"https://www.omim.org/entry/602820"},{"mim_id":"164060","title":"NUCLEOSOME ASSEMBLY PROTEIN 1-LIKE 1; NAP1L1","url":"https://www.omim.org/entry/164060"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Microtubules","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NAP1L1"},"hgnc":{"alias_symbol":["NRP","NAP1","NAP1L","MGC8688","MGC23410"],"prev_symbol":[]},"alphafold":{"accession":"P55209","domains":[{"cath_id":"3.30.1120.90","chopping":"53-128_166-351","consensus_level":"medium","plddt":91.7379,"start":53,"end":351}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P55209","model_url":"https://alphafold.ebi.ac.uk/files/AF-P55209-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P55209-F1-predicted_aligned_error_v6.png","plddt_mean":79.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NAP1L1","jax_strain_url":"https://www.jax.org/strain/search?query=NAP1L1"},"sequence":{"accession":"P55209","fasta_url":"https://rest.uniprot.org/uniprotkb/P55209.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P55209/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P55209"}},"corpus_meta":[{"pmid":"14765121","id":"PMC_14765121","title":"Sra-1 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standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":61685,"output_tokens":10893,"usd":0.174225},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":12942,"output_tokens":4759,"usd":0.275527}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2018,\n      \"finding\": \"NAP1L1 promotes cell proliferation and chemoresistance in glioma by interacting with HDGF at the protein level; HDGF in turn recruits the transcription factor c-Jun, which induces expression of CCND1/CDK4/CDK6 cell cycle promoters.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, siRNA/shRNA knockdown with functional rescue, in vivo tumor model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional rescue, single lab\",\n      \"pmids\": [\"34959221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NAP1L1 binds directly to the p57(Kip2) (CDKN1C) promoter (chromatin immunoprecipitation, region -164 to +21) and epigenetically promotes promoter methylation, thereby suppressing p57(Kip2) expression and activating the mTOR pathway to drive pancreatic neuroendocrine neoplasm proliferation.\",\n      \"method\": \"ChIP, siRNA/shRNA knockdown, methylation assay, in vitro and orthotopic in vivo models\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct ChIP evidence plus functional KD with defined phenotype, single lab\",\n      \"pmids\": [\"25071868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NAP1L1 directly interacts with Cockayne syndrome protein B (CSB) and enhances its nucleosome-remodeling activity by accelerating the activation and translocation phases and decreasing pausing probability, as measured at the single-molecule level.\",\n      \"method\": \"Single-molecule FRET/magnetic tweezers, in vitro nucleosome remodeling assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-molecule reconstituted in vitro assay with mechanistic dissection\",\n      \"pmids\": [\"28369616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HCV NS5A interacts with NAP1L1 (mapped to the C terminus of NS5A), sequesters it in the cytoplasm blocking nuclear translocation, and (for genotype 2 only) targets it for proteasome-mediated degradation; loss of NAP1L1 decreases RELA protein levels and impairs IRF3 TBK1/IKKε-mediated phosphorylation, crippling RIG-I and TLR3 antiviral responses.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, siRNA knockdown, subcellular fractionation, phosphorylation assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with domain mapping plus functional pathway readouts, single lab\",\n      \"pmids\": [\"28659470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NAP1L1 promotes pancreatic/hepatocellular tumor proliferation through regulation of the PI3K/AKT/mTOR signaling cascade; PRDM8 acts upstream as a transcriptional repressor to suppress NAP1L1 expression, thereby inhibiting this pathway.\",\n      \"method\": \"Lentiviral overexpression/knockdown, Western blot for pathway proteins, in vivo xenograft\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD/OE with defined pathway readout, in vivo confirmation, single lab\",\n      \"pmids\": [\"29572888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NAP1L1 controls neural progenitor cell (NPC) proliferation and differentiation during cortical development; mechanistically, Nap1l1 promotes SETD1A-mediated H3K4 trimethylation at the RassF10 promoter to regulate RassF10 expression, and RassF10 overexpression rescues Nap1l1 KO neurogenesis defects.\",\n      \"method\": \"CRISPR-Cas9 KO, in utero knockdown, RNA-seq, ChIP for H3K4me3, rescue experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — genetic KO with mechanistic ChIP and rescue, multiple orthogonal methods\",\n      \"pmids\": [\"29490266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NAP1 (NAP1L1 ortholog) is recruited to chromatin through direct interaction with activator-bound p300 and mediates gene-specific eviction of linker histone H1 and H2A-H2B to enable transcription activation (activator→p300→NAP1→H1 pathway); validated at the endogenous CD40 locus in B cells.\",\n      \"method\": \"In vitro reconstituted chromatin transcription, direct binding assays, ChIP in B cells, H1 eviction assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution plus in vivo ChIP validation, mechanistic pathway defined\",\n      \"pmids\": [\"30902546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIV-1 Rev forms a stable complex with nucleosome assembly protein 1 (Nap1) through the Rev arginine-rich domain; Nap1 alters Rev oligomerization state in vitro, stimulates Rev-mediated RNA export, reduces nucleolar localization of Rev, and affects Rev nuclear import rates.\",\n      \"method\": \"TAP-tag purification, Rev affinity column pulldown, in vitro oligomerization assay, functional export assay, localization studies\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — reciprocal pulldown plus functional assays, single lab\",\n      \"pmids\": [\"19339032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NAP1L1 promotes ovarian cancer cell proliferation by interacting with HDGF in the cytoplasm; HDGF recruits c-JUN to induce cyclin D1 (CCND1) expression, and HDGF overexpression rescues proliferation suppressed by NAP1L1 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA/shRNA KD, functional rescue\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with functional rescue, independent replication of glioma finding\",\n      \"pmids\": [\"35351053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NAP1L1 overexpression promotes glioblastoma stem cell proliferation; anti-NAP1L1 nanobody (Nb179) displays cytotoxic effects selectively on mature glioblastoma cells, and NAP1L1 is significantly overexpressed in glioblastoma stem cells versus astrocytes at both mRNA and protein levels.\",\n      \"method\": \"qPCR, ELISA, immunocytochemistry, cytotoxicity assays (AlamarBlue), cell migration assay\",\n      \"journal\": \"Therapeutic advances in medical oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional KD/nanobody with cytotoxicity readout but limited pathway mechanistic detail\",\n      \"pmids\": [\"32426045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In renal cell carcinoma, miR-532-5p directly targets NAP1L1 (and KRAS); ETS1 suppresses miR-532-5p transcription, creating a positive feedback loop in which high ETS1→low miR-532-5p→high NAP1L1/KRAS→high P-ERK→high ETS1 drives cell proliferation.\",\n      \"method\": \"Luciferase reporter assay, Western blot, chromatin immunoprecipitation, in vivo xenograft\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct target validation by luciferase plus ChIP epistasis, single lab\",\n      \"pmids\": [\"30082686\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NAP1L1 is a histone chaperone and chromatin regulator that: (1) binds directly to the p57(Kip2) promoter to epigenetically silence this tumor suppressor; (2) interacts with HDGF in the cytoplasm to activate c-Jun/CCND1/CDK4/CDK6 and mTOR signaling, driving tumor cell proliferation; (3) enhances CSB-mediated nucleosome remodeling during transcription-coupled DNA repair by accelerating activation/translocation and reducing pausing; (4) is recruited by p300 to mediate gene-specific linker histone H1 eviction and transcription activation; (5) promotes SETD1A-mediated H3K4me3 at target gene promoters to control neural progenitor cell fate; and (6) is targeted by viral (HCV NS5A) and cellular factors (miR-532-5p) to modulate antiviral signaling and oncogenic feedback loops.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\nThe target gene is NAP1L1 (Nucleosome Assembly Protein 1-Like 1), the human histone chaperone protein.\n\nMany papers in this corpus describe other \"NAP\" proteins:\n- Papers about \"Nap1\" in actin/WAVE/Rac signaling (NCKAP1/NCK-associated protein 1) — EXCLUDE (alias collision)\n- Papers about C-Nap1 (CEP250, centrosomal protein) — EXCLUDE (alias collision)\n- Papers about NAP1 = NAK-associated protein 1 (TBK1 adaptor) — EXCLUDE (alias collision)\n- Papers about NAP-1 = IL-8/neutrophil attractant — EXCLUDE (alias collision)\n- Papers about BI/NAP1/027 C. difficile strain — EXCLUDE (alias collision)\n- Papers about NRP-1/NRP-2 (neuropilins) — EXCLUDE (alias collision)\n- Papers about plant NRP (asparagine-rich protein) — EXCLUDE (alias collision)\n- Papers about NRP/B (BTB/Kelch nuclear matrix protein) — EXCLUDE (alias collision)\n- Papers about yeast/Drosophila/Xenopus Nap1 (histone chaperone, ortholog of NAP1L1) — KEEP if functionally consistent with histone chaperone role\n- Papers explicitly about NAP1L1 human protein — KEEP\n\n**KEPT papers:**\n- PMID:20347425 — yeast Nap1 histone chaperone mechanism (ortholog, Tier 1)\n- PMID:18728017 — yeast Nap1 thermodynamics with histones (ortholog)\n- PMID:21329878 — Nap1/Vps75 bind H3/H4 tetramer (ortholog)\n- PMID:23973327 — Nap1 chaperones H2A-H2B (ortholog)\n- PMID:17317729 — Nap1 review (ortholog functions)\n- PMID:19782028 — Drosophila NAP1 in silencing complexes (ortholog)\n- PMID:12944491 — yeast Nap1 nucleocytoplasmic shuttling (ortholog)\n- PMID:18086883 — CK2 phosphorylation of yeast Nap1 (ortholog)\n- PMID:23050009 — NAP1-assisted nucleosome assembly single-molecule (ortholog)\n- PMID:24798879 — Nap1 stimulates HR via RAD54 (ortholog context but uses human cells)\n- PMID:25897082 — Xenopus Nap1 glutamylation/H1 dynamics (ortholog)\n- PMID:30902546 — NAP1 H1 eviction via activator→p300→NAP1 pathway (uses NAP1 generically but describes histone chaperone)\n- PMID:19929865 — yeast Nap1 in Htz1 nuclear import (ortholog)\n- PMID:17595058 — NAP1 and H3/H4 supercoiling (ortholog)\n- PMID:23401858 — Nap1/Vps75 histone acetylation during elongation (ortholog)\n- PMID:24086141 — Drosophila NAP1 cohesin release (ortholog)\n- PMID:17339334 — Alien binds NAP1, enhances nucleosome assembly (ortholog)\n- PMID:31062022 — yeast Nap1 as Rps6 chaperone (ortholog)\n- PMID:26884462 — yeast Nap1 H2A-H2B dynamics at GAL locus (ortholog)\n- PMID:12788058 — yeast NAP1 genome-wide expression (ortholog)\n- PMID:28369616 — NAP1L1 enhances CSB remodeling — explicitly NAP1L1 KEEP\n- PMID:25071868 — NAP1L1 in pancreatic NEN, p57Kip2 regulation — explicitly NAP1L1 KEEP\n- PMID:29490266 — Nap1l1 in neural progenitor proliferation — explicitly NAP1L1 KEEP\n- PMID:28659470 — HCV NS5A targets NAP1L1 — explicitly NAP1L1 KEEP\n- PMID:30165194 — CDKN2B-AS1/let-7c-5p/NAP1L1 axis — mentions NAP1L1 but primarily expression/lncRNA study; NAP1L1 described as activating PI3K/AKT/mTOR — KEEP (mechanistic finding about NAP1L1)\n- PMID:29572888 — PRDM8 targets NAP1L1, PI3K/AKT/mTOR — KEEP\n- PMID:30082686 — miR-532-5p targets KRAS and NAP1L1, P-ERK axis — KEEP\n- PMID:34959221 — NAP1L1 interacts with HDGF, promotes glioma — KEEP\n- PMID:35351053 — NAP1L1/HDGF/C-JUN in ovarian cancer — KEEP\n- PMID:38816735 — circDCAF8/miR-217/NAP1L1 axis — KEEP (identifies NAP1L1 as downstream)\n- PMID:32426045 — anti-NAP1L1 nanobody cytotoxicity — limited mechanistic, mostly phenotypic — borderline KEEP\n- PMID:16424981 — NAP1L1 overexpressed in carcinoid, mitotic regulation noted — expression study, EXCLUDE\n- PMID:19339032 — HIV Rev interacts with Nap1 — this Nap1 is the human ortholog (NAP1L1 family) — KEEP\n- PMID:9730615 — TSPY-SET-NAP1L1 family characterization — KEEP (defines family)\n- PMID:15980199 — plant NAP1 family — EXCLUDE (plant, symbol collision context)\n- PMID:19228338 — Arabidopsis NAP1 — EXCLUDE (plant)\n- PMID:10673335 — human Nap1 (NCKAP1) Alzheimer — EXCLUDE (this is NCKAP1, not NAP1L1)\n- PMID:11418237 — hNap1BP/NCKAP1 — EXCLUDE (NCKAP1)\n- PMID:16831833 — mouse Nap1/WAVE complex — EXCLUDE (NCKAP1)\n- PMID:14765121 — Sra-1/Nap1/WAVE — EXCLUDE (NCKAP1)\n- PMID:18644894 — OL-protocadherin/Nap1 actin — EXCLUDE (NCKAP1)\n- PMID:29457830 — miR-124-3p/NRP-1 glioblastoma — EXCLUDE (NRP-1=neuropilin)\n- PMID:9214386 — yeast Nap1/Gin4/Clb2 mitosis — this is yeast NAP1 ortholog of NAP1L1 histone chaperone — KEEP (NAP1 binds mitotic cyclin Clb2)\n- PMID:7622567 — yeast NAP1/Clb2 mitotic functions — KEEP (ortholog)\n\nNow extracting discoveries from KEPT papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) is required for the mitotic cyclin Clb2 to carry out its full range of mitotic functions; in NAP1-deleted cells, Clb2/CDC28 kinase activity rises normally yet cells undergo prolonged delay at the short spindle stage, fail to switch from polar to isotropic bud growth, and show aberrant microtubule dynamics, demonstrating that NAP1 acts downstream of or in parallel to cyclin-CDK activation.\",\n      \"method\": \"Genetic deletion of NAP1 combined with Clb2 functional assays and cell-cycle phenotype analysis in S. cerevisiae\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple defined cellular phenotypes, replicated in follow-up studies\",\n      \"pmids\": [\"7622567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) physically associates with the kinase Gin4; NAP1 and the mitotic cyclin Clb2 together are required for phosphorylation and activation of Gin4, placing NAP1 in a pathway that links cyclin-CDK complexes to Gin4-dependent control of bud morphogenesis and mitotic progression.\",\n      \"method\": \"Affinity chromatography, in vivo phosphorylation assays, kinase activity assays, genetic epistasis in S. cerevisiae\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical binding confirmed by affinity chromatography plus in vivo phosphorylation and kinase assays\",\n      \"pmids\": [\"9214386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"NAP1L1 is a member of the TSPY-SET-NAP1L1 gene family; TSPYL genes were identified as novel members of this family by EST analysis and sequence homology, establishing the evolutionary relationships among NAP1L1, SET, and TSPY.\",\n      \"method\": \"EST sequence analysis, chromosomal localization, expression profiling\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/sequence-based classification, no functional mechanistic data\",\n      \"pmids\": [\"9730615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Deletion of yeast NAP1 (ortholog of NAP1L1) leads to genome-wide transcriptional changes (~10% of ORFs altered ≥2-fold) that are clustered along chromosomes, indicating NAP1 is required for maintenance of cumulative nucleosome formation in vivo and that loss of NAP1 disrupts local chromatin architecture.\",\n      \"method\": \"Genome-wide DNA microarray expression profiling of Δnap1 S. cerevisiae\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide functional readout in clean deletion strain, single lab\",\n      \"pmids\": [\"12788058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) shuttles between cytoplasm and nucleus; a putative nuclear export signal (NES) in yNap1 mediates its cytoplasmic localization, and NES-deletion mutants accumulate in the nucleus. Nucleocytoplasmic shuttling is required for NAP1 function in mitotic progression, as NES-lacking mutants fail to complement mitotic delay and temperature-sensitive growth phenotypes of NAP1-deleted strains.\",\n      \"method\": \"GFP localization, NES mutagenesis, complementation of nap1 deletion phenotypes in S. cerevisiae\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by imaging combined with mutagenesis and functional complementation\",\n      \"pmids\": [\"12944491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) is phosphorylated in vivo at 11 sites; casein kinase 2 (CK2) phosphorylates three specific serine residues on NAP1. Phosphorylation of these serines by CK2 promotes nuclear import of NAP1 and is required for normal S-phase progression, as serine-to-alanine or serine-to-aspartate mutations both prolong S phase.\",\n      \"method\": \"Mass spectrometry identification of phosphorylation sites, in vitro CK2 kinase assays, alanine/aspartate mutagenesis, cell-cycle analysis in S. cerevisiae\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — MS-identified sites validated by in vitro kinase assay and mutagenesis with functional readout\",\n      \"pmids\": [\"18086883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The corepressor Alien binds NAP1 (ortholog of NAP1L1) in vivo and in vitro and enhances NAP1-mediated nucleosome assembly on DNA. Alien also reduces the accessibility of histones H3 and H4 for the NAP1-promoted assembly reaction, and both NAP1 and Alien localize to the endogenous CYP24 promoter, a VDR target gene, in vivo.\",\n      \"method\": \"Co-IP, GST pulldown, in vitro nucleosome assembly assay, chromatin immunoprecipitation and re-ChIP\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding confirmed by multiple methods plus in vitro functional assay and in vivo ChIP\",\n      \"pmids\": [\"17339334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Excess NAP1 (ortholog of NAP1L1) added to H3/H4 shifts the tetramer–dimer equilibrium toward dimers, and H3/H4 dimers deposited on DNA form positively supercoiled DNA, whereas tetramers form negatively supercoiled DNA. NAP1 can also alter the conformational state of pre-bound H3/H4, suggesting a role in modulating chromatin topology during transcription.\",\n      \"method\": \"DNA supercoiling assays, formaldehyde crosslinking, DTNB modification of H3-Cys110, topoisomerase-relaxation assays in vitro\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — rigorous in vitro reconstitution, single lab\",\n      \"pmids\": [\"17595058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) binds H2A/H2B and H3/H4 histone complexes with low nanomolar affinity; each NAP1 dimer binds two histone fold dimers. The NAP1 tails contribute synergistically to histone binding, whereas histone tails have a slightly repressive effect. The (H3/H4)₂ tetramer binds DNA with higher affinity than it binds NAP1, establishing a thermodynamic framework for histone exchange.\",\n      \"method\": \"Quantitative fluorescence-based binding assays, thermodynamic analysis of purified yNap1 and histone complexes in vitro\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative in vitro reconstitution with rigorous thermodynamic measurements\",\n      \"pmids\": [\"18728017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Drosophila NAP1 (ortholog of NAP1L1) interacts with the RLAF silencing complex (comprising RPD3, LID/KDM5, SIN3A, PF1, EMSY, MRG15) and links it to the Su(H)/Hairless DNA-binding complex at NOTCH-regulated E(spl) genes. NAP1 directs high nucleosome density near E(spl) control elements and mediates both H3 deacetylation and H3K4me3 demethylation by RLAF, distinguishing its function from that of ASF1.\",\n      \"method\": \"Proteomics/mass spectrometry interaction network, co-IP, ChIP, nucleosome density analysis in Drosophila\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — proteomics-identified interactions validated by co-IP and ChIP with mechanistic readouts\",\n      \"pmids\": [\"19782028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) forms an RanGTP-insensitive import complex with Htz1/H2B and the karyopherin Kap114, facilitating nuclear import of the histone variant Htz1. NAP1 is required for maintaining a soluble cytoplasmic pool of Htz1, and NAP1 has Htz1-independent functions not shared by the chaperone Chz1.\",\n      \"method\": \"Copurification, nuclear import assays, RanGTP competition assays, genetic analysis in S. cerevisiae\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical copurification combined with functional import assays and genetic evidence\",\n      \"pmids\": [\"19929865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIV-1 Rev protein forms a stable complex with human nucleosome assembly protein 1 (Nap1, a NAP1L1-family member) through the Rev arginine-rich domain; Nap1 alters the oligomerization state of Rev in vitro. Overexpression of Nap1 stimulates Rev-mediated RNA export, reduces nucleolar localization of Rev, and affects Rev nuclear import rates.\",\n      \"method\": \"Tandem affinity purification (TAP), Rev affinity column retention, in vitro oligomerization assay, overexpression functional assays in human cells\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical interaction confirmed by multiple methods with functional consequence, single lab\",\n      \"pmids\": [\"19339032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast NAP1 (ortholog of NAP1L1) promotes nucleosome assembly by eliminating competing nonnucleosomal histone-DNA interactions; thermodynamic studies show NAP1 lowers the free energy barrier for nucleosome formation. Deletion of NAP1 in yeast results in a significant increase in atypical histone-DNA complexes and deregulated transcription activation and repression in vivo.\",\n      \"method\": \"In vitro thermodynamic nucleosome assembly assays (FRET, sedimentation), in vivo micrococcal nuclease assays in Δnap1 yeast, transcription reporter assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with thermodynamic quantification validated by in vivo genetic experiments\",\n      \"pmids\": [\"20347425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nap1 and the related chaperone Vps75 (both NAP1-family members, orthologs of NAP1L1) bind histones H3 and H4 in the tetrameric conformation as observed in the nucleosome. H3/H4 trapped in tetrameric state by these chaperones can be used as substrates for nucleosome assembly and chaperone-mediated lysine acetylation.\",\n      \"method\": \"Pulsed electron double resonance (PELDOR) measurements, protein crosslinking, in vitro nucleosome assembly, acetylation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — novel structural technique (PELDOR) combined with functional in vitro assays\",\n      \"pmids\": [\"21329878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NAP1-assisted nucleosome assembly is a two-step process as measured at the single-molecule level: NAP1 and core histones first compact DNA, and nucleosomes are assembled with a characteristic change in linking number (~56 nm compaction per nucleosome). Non-nucleosomal H3/H4 binding does not produce the linking number change that complete nucleosome assembly generates.\",\n      \"method\": \"Single-molecule magnetic tweezers measuring DNA end-to-end length and linking number changes in real time\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-molecule reconstitution with quantitative mechanistic readout\",\n      \"pmids\": [\"23050009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nap1 (NAP1L1 ortholog) shields the histone H2A-H2B interaction surfaces used within the nucleosome, protecting them from promiscuous DNA interactions. Hydrogen-deuterium exchange MS reveals H2A-H2B α-helices sample partially disordered conformations at low ionic strength; Nap1 binding reduces this conformational sampling. Two copies of H2A-H2B bound to a Nap1 homodimer form a tetramer through H2B–H2B contacts resembling a four-helix bundle. The Nap1–H2A-H2B interaction surface is confirmed as functionally relevant both in vitro and in vivo.\",\n      \"method\": \"Hydrogen-deuterium exchange coupled to mass spectrometry (HDX-MS), mutagenesis, in vitro and in vivo functional validation\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — HDX-MS structural approach combined with mutagenesis and in vivo validation\",\n      \"pmids\": [\"23973327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Drosophila NAP1 (ortholog of NAP1L1) is required for cohesin release and sister chromatid resolution during mitosis. NAP1 associates with the full cohesin complex and also forms a separate complex with the cohesin subunit SA/stromalin. NAP1 binding to cohesin is cell-cycle regulated, increasing in G2/M; this causes dissociation of PP2A from cohesin, increased SA phosphorylation, and cohesin removal. The balanced antagonism between NAP1 and PP2A controls mitotic cohesin dissociation.\",\n      \"method\": \"Proteomics, co-IP, genome-wide ChIP-seq (NAP1 and cohesin co-localization), genetic rescue experiments in Drosophila\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (proteomics, co-IP, ChIP, genetics) in a single rigorous study\",\n      \"pmids\": [\"24086141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Yeast Nap1 (NAP1L1 ortholog) and Vps75 regulate histone H3-K9 acetylation during transcription elongation by modulating Rtt109 acetyltransferase activity. Loss of NAP1 suppresses cryptic transcription within ORFs seen in ctk1 deletion strains and reduces H3-K9 acetylation at the STE11 ORF, indicating Nap1 regulates Rtt109-dependent chromatin acetylation during elongation.\",\n      \"method\": \"Genetic suppression analysis, ChIP for histone modifications, genetic interactions in S. cerevisiae\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with ChIP validation, single lab\",\n      \"pmids\": [\"23401858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NAP1L1 silencing (siRNA/shRNA) in pancreatic neuroendocrine neoplasm cells decreases proliferation by inhibiting mTOR pathway proteins and their phosphorylation. NAP1L1 binds directly to the p57(Kip2)/CDKN1C promoter (by ChIP, region -164 to +21) and promotes its methylation, thereby silencing p57(Kip2) expression. NAP1L1 knockdown reduces p57(Kip2) promoter methylation and upregulates p57(Kip2) transcript and protein, establishing NAP1L1 as an epigenetic regulator of the CDKN1C tumor suppressor.\",\n      \"method\": \"siRNA/shRNA knockdown, chromatin immunoprecipitation (ChIP) of NAP1L1 at CDKN1C promoter, bisulfite methylation analysis, mTOR pathway Western blotting, orthotopic mouse tumor model\",\n      \"journal\": \"Epigenetics & chromatin\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct ChIP evidence of promoter binding combined with methylation analysis, functional knockdown in vitro and in vivo\",\n      \"pmids\": [\"25071868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nap1 (NAP1L1 ortholog) accumulates at DNA double-strand break (DSB) sites in human cells and DSB repair is substantially decreased in Nap1-knockdown cells. Nap1 binds RAD54, enhances RAD54-mediated nucleosome remodeling by evicting linker histone H1, and stimulates RAD51-mediated homologous pairing in higher-ordered chromatin containing histone H1.\",\n      \"method\": \"ChIP at DSB sites, siRNA knockdown DSB repair assay, in vitro RAD51/RAD54 homologous pairing assay with reconstituted chromatin, H1 eviction assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of HR in defined chromatin combined with cell-based DSB repair assays\",\n      \"pmids\": [\"24798879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Xenopus Nap1 (ortholog of NAP1L1) associates with the embryonic linker histone H1M in egg extracts; immunodepletion of Nap1 decreases H1M binding to mitotic chromosomes by ~50%, reduces H1M dynamics (FRAP), and causes chromosome decondensation similar to H1M depletion. Glutamylation of Nap1 (posttranslational modification) is required for proper H1M deposition; a glutamylation-deficient Nap1 mutant fails to rescue H1M dynamics or chromosome condensation, demonstrating that charge-shifting glutamylation of Nap1 controls linker histone dynamics essential for chromosome architecture.\",\n      \"method\": \"Xenopus egg extract immunodepletion, FRAP, chromosome condensation assays, add-back of wild-type vs. glutamylation-mutant Nap1\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — immunodepletion/rescue with PTM-mutant in reconstituted system with multiple functional readouts\",\n      \"pmids\": [\"25897082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Yeast Nap1 (NAP1L1 ortholog) is a major regulator of H2A-H2B dynamics at the GAL locus: in NAP1-deleted cells, H2A-H2B accumulates at the repressed GAL locus on linker DNA independent of DNA sequence preference, and upon transcriptional activation H2A-H2B levels are further depleted in a NAP1-dependent manner. Nap1 is specifically required for transcription-dependent H2A-H2B exchange.\",\n      \"method\": \"ChIP for H2A-H2B and H3-H4 in Δnap1 vs. WT cells, in vivo histone exchange assay at GAL locus, in vitro nucleosome reconstitutions\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — combined in vivo ChIP and in vivo exchange assays with in vitro reconstitution, single rigorous study\",\n      \"pmids\": [\"26884462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NAP1L1 directly interacts with the ATP-dependent chromatin remodeler CSB (Cockayne syndrome protein B) and enhances CSB-mediated nucleosome remodeling. At the single-molecule level, NAP1L1 suppresses non-productive DNA-binding by CSB, accelerates both the activation and translocation phases of remodeling, and decreases the probability of CSB pausing during translocation, thereby increasing CSB processivity. This defines NAP1L1 as a regulatory cofactor that stimulates transcription-coupled nucleotide excision repair (TC-NER) by enhancing CSB remodeling activity.\",\n      \"method\": \"Single-molecule FRET (smFRET) and total internal reflection fluorescence microscopy to monitor CSB–DNA interactions and nucleosome remodeling in real time; in vitro reconstitution with purified NAP1L1 and CSB\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — single-molecule reconstitution with multiple mechanistic readouts (activation, translocation, pausing phases), directly studies NAP1L1\",\n      \"pmids\": [\"28369616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HCV NS5A protein interacts with NAP1L1 and sequesters it in the cytoplasm, blocking NAP1L1 nuclear translocation. NS5A from genotype 2 (but not genotype 1) additionally targets NAP1L1 for proteasome-mediated degradation. Loss of NAP1L1 leads to decreased RELA protein levels and strongly impairs IRF3 phosphorylation by TBK1/IKKε, resulting in defective RIG-I and TLR3 antiviral signaling responses.\",\n      \"method\": \"Co-IP of NS5A and NAP1L1, domain mapping, subcellular fractionation, siRNA knockdown of NAP1L1, Western blotting for RELA and p-IRF3, RIG-I/TLR3 reporter assays in human hepatoma cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — binding mapped by domain deletions, subcellular localization by fractionation, functional consequence established by knockdown with multiple pathway readouts, directly studies NAP1L1\",\n      \"pmids\": [\"28659470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NAP1L1 promotes proliferation of renal cancer cells partly through a KRAS-NAP1L1/P-ERK/ETS1 positive feedback axis; miR-532-5p directly targets both KRAS and NAP1L1 to suppress this pathway. ETS1 suppresses miR-532-5p transcription by binding its promoter, creating a feedback loop. Overexpression of NAP1L1 rescues the anti-proliferative effect of miR-532-5p.\",\n      \"method\": \"Luciferase reporter assay (3'UTR targeting), chromatin immunoprecipitation (ETS1 at miR-532-5p promoter), Western blotting for P-ERK, overexpression rescue experiments in RCC cells\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — direct 3'UTR targeting validated by luciferase, ChIP for transcription factor binding, functional rescue; pathway placement is indirect\",\n      \"pmids\": [\"30082686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NAP1L1 is required for neural progenitor cell (NPC) proliferation and restraint of premature neuronal differentiation during cortical development. Nap1l1 knockdown and CRISPR-Cas9 knockout in mice decreases NPC proliferation and induces premature neuronal differentiation. RNA-seq identifies RassF10 as a downstream target; Nap1l1 promotes SETD1A-mediated H3K4 trimethylation at the RassF10 promoter to maintain RassF10 expression, and RassF10 overexpression rescues Nap1l1 KO neurogenesis defects.\",\n      \"method\": \"In utero electroporation knockdown, CRISPR-Cas9 knockout mice, RNA-seq, ChIP for H3K4me3 at RassF10 promoter, RassF10 rescue experiments\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse plus in vivo rescue with epistasis established by RassF10 overexpression; ChIP links NAP1L1 to H3K4me3 at target promoter\",\n      \"pmids\": [\"29490266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PRDM8 (a PR domain protein) suppresses NAP1L1 expression in hepatocellular carcinoma cells; NAP1L1 activates the PI3K/AKT/mTOR signaling cascade, and PRDM8-mediated inhibition of HCC growth and metastasis is mediated through downregulation of NAP1L1.\",\n      \"method\": \"Lentiviral overexpression/knockdown of PRDM8, Western blotting for PI3K/AKT/mTOR phospho-proteins, rescue by NAP1L1 re-expression, in vivo tumor model\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement by Western blot and rescue, no direct biochemical interaction between PRDM8 and NAP1L1 shown\",\n      \"pmids\": [\"29572888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"lncRNA CDKN2B-AS1 promotes NAP1L1 expression by sponging miR-let-7c-5p; elevated NAP1L1 activates PI3K/AKT/mTOR signaling in HCC cells. NAP1L1 restoration abolishes the anti-proliferative and anti-metastatic effects of CDKN2B-AS1 knockdown, placing NAP1L1 downstream of the CDKN2B-AS1/let-7c-5p axis as a positive regulator of PI3K/AKT/mTOR.\",\n      \"method\": \"siRNA knockdown, luciferase reporter for miRNA sponging, Western blotting for p-AKT/p-mTOR, NAP1L1 rescue overexpression in HCC cells\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — pathway placement by Western blot with functional rescue; mechanistic link between NAP1L1 and PI3K/AKT/mTOR is inferred, not directly biochemically shown\",\n      \"pmids\": [\"30165194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Yeast Nap1 (NAP1L1 ortholog) serves as a dedicated ribosomal protein chaperone for Rps6 (small ribosomal subunit protein 6); Nap1 promotes solubility of Rps6 in vitro and interacts with a large, mostly eukaryote-specific binding surface of Rps6. Deletion of NAP1 enhances 40S synthesis defects of Rps6 mutants, demonstrating a co-evolutionary role of Nap1 in ribosome biogenesis beyond histone chaperoning.\",\n      \"method\": \"Tandem-affinity purification screen, in vitro solubility assay for r-proteins, genetic interaction analysis in S. cerevisiae\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — AP-based screen with in vitro solubility validation and genetic interaction; single lab\",\n      \"pmids\": [\"31062022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NAP1 (histone chaperone, NAP1L1 ortholog) mediates gene-specific eviction of linker histone H1 through a transcriptional activator→p300→NAP1→H1 pathway. In H1-compacted chromatin reconstituted in vitro, NAP1 is recruited by activator-bound p300 through direct interaction; NAP1 then facilitates core histone acetylation by p300 and concomitantly evicts H1 and H2A-H2B to enable transcription. In B cells, NAP1-mediated H1 eviction is required for induction of the CD40 gene.\",\n      \"method\": \"In vitro chromatin transcription reconstitution, co-IP of NAP1 with p300 and activators, H1 eviction assay, B cell CD40 gene induction assays with NAP1 depletion\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro chromatin reconstitution plus co-IP and cell-based gene induction assays with multiple orthogonal methods\",\n      \"pmids\": [\"30902546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NAP1L1 interacts with hepatoma-derived growth factor (HDGF) at the protein level; they co-localize in the cytoplasm. HDGF in turn interacts with the transcription factor c-Jun, which induces expression of cell cycle promoters CCND1/CDK4/CDK6. Knockdown of NAP1L1 in glioma cells inhibits proliferation and sensitizes cells to cisplatin, and this effect is reversed by HDGF overexpression, placing NAP1L1 upstream of the HDGF/c-Jun/CCND1 axis.\",\n      \"method\": \"Co-immunoprecipitation of NAP1L1 and HDGF, immunofluorescence co-localization, siRNA knockdown, Western blotting for CCND1/CDK4/CDK6, HDGF rescue overexpression, in vivo tumor model\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP and co-localization with functional rescue; pathway is inferred from downstream markers\",\n      \"pmids\": [\"34959221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"NAP1L1 interacts with HDGF in ovarian cancer cells (co-IP and immunofluorescence); HDGF recruits c-Jun to induce CCND1 expression, promoting G1/S progression. NAP1L1 knockdown blocks G1/S transition and induces apoptosis, and HDGF overexpression in NAP1L1-knockdown cells restores proliferation, confirming the NAP1L1→HDGF→c-Jun→CCND1 proliferative axis.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA/shRNA knockdown, flow cytometry cell cycle analysis, HDGF rescue in SKOV3/OVCAR3 cells\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP confirmed interaction with functional rescue; replicates glioma findings in a different cancer type\",\n      \"pmids\": [\"35351053\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NAP1L1 (and its well-characterized orthologs) functions as a histone chaperone that (i) binds H2A-H2B and H3/H4 with nanomolar affinity to prevent nonnucleosomal histone-DNA interactions and facilitate nucleosome assembly/disassembly in a two-step process, (ii) evicts linker histone H1 via recruitment to activator-bound p300 to enable gene-specific transcription, (iii) promotes CSB-mediated nucleosome remodeling during transcription-coupled DNA repair by suppressing non-productive DNA binding and reducing remodeler pausing, (iv) is regulated by CK2-mediated phosphorylation that promotes its nuclear import, and by glutamylation that modulates linker histone dynamics, (v) controls cohesin release and sister chromatid resolution during mitosis by antagonizing PP2A, and (vi) in mammalian cells regulates neural progenitor proliferation through SETD1A-mediated H3K4me3 at the RassF10 promoter, epigenetically silences CDKN1C/p57(Kip2) to promote tumor cell proliferation, interacts with HDGF to activate c-Jun/CCND1/CDK4/CDK6 signaling, and is targeted by HCV NS5A to suppress antiviral IRF3/TBK1 signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NAP1L1 is a histone chaperone that integrates chromatin remodeling with transcriptional regulation, DNA repair, and cell proliferation control. It is recruited by p300 to activator-occupied promoters where it evicts linker histone H1 and H2A-H2B dimers to enable transcription activation [PMID:30902546], and it enhances CSB-mediated nucleosome remodeling during transcription-coupled repair by accelerating the translocation phase and reducing pausing [PMID:28369616]. NAP1L1 promotes SETD1A-dependent H3K4 trimethylation at target promoters such as RassF10 to regulate neural progenitor cell fate during cortical development [PMID:29490266], and it binds the CDKN1C (p57Kip2) promoter to drive promoter methylation and silencing, thereby activating mTOR signaling and tumor cell proliferation [PMID:25071868]. In the cytoplasm, NAP1L1 interacts with HDGF to activate a c-Jun/CCND1 proliferative axis in multiple tumor types [PMID:34959221, PMID:35351053], and HCV NS5A sequesters NAP1L1 cytoplasmically to impair NF-κB/IRF3 antiviral signaling [PMID:28659470].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing that NAP1L1 functions beyond canonical histone chaperoning by forming a stable complex with HIV-1 Rev and modulating its oligomerization, nuclear import, and RNA export activity.\",\n      \"evidence\": \"TAP-tag purification and Rev affinity pulldown with functional RNA export assays in cell culture\",\n      \"pmids\": [\"19339032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Reciprocal validation limited to pulldown; structural basis of Rev–NAP1L1 interaction unknown\",\n        \"Whether NAP1L1's histone-binding surface overlaps with the Rev-interaction surface is unresolved\",\n        \"Physiological relevance during HIV infection in primary cells not tested\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrating that NAP1L1 acts at specific gene promoters as a chromatin regulator: it binds the CDKN1C (p57Kip2) promoter and promotes DNA methylation-mediated silencing, linking histone chaperone activity to epigenetic gene repression and mTOR-driven tumor proliferation.\",\n      \"evidence\": \"ChIP localizing NAP1L1 to the CDKN1C promoter, methylation assays, siRNA knockdown with proliferation and orthotopic xenograft readouts\",\n      \"pmids\": [\"25071868\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How NAP1L1 recruits or facilitates DNA methyltransferase activity at this locus is unknown\",\n        \"Whether promoter-binding and methylation-promoting activity extends to other CpG island genes is untested\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealing a direct mechanistic role for NAP1L1 in DNA repair: it physically interacts with the CSB remodeler and accelerates its nucleosome translocation while reducing pausing, providing single-molecule evidence for how histone chaperones tune remodeler kinetics.\",\n      \"evidence\": \"Single-molecule FRET and magnetic tweezers on reconstituted nucleosomes with purified proteins\",\n      \"pmids\": [\"28369616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"In vivo relevance for transcription-coupled nucleotide excision repair efficiency not demonstrated\",\n        \"Whether NAP1L1 acts on other SWI/SNF-family remodelers via the same mechanism is unknown\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying NAP1L1 as a host factor co-opted by HCV NS5A: viral protein sequesters NAP1L1 in the cytoplasm and (genotype-dependently) triggers its proteasomal degradation, which impairs NF-κB/RELA stability and IRF3 phosphorylation, thereby crippling RIG-I and TLR3 innate immune pathways.\",\n      \"evidence\": \"Co-immunoprecipitation with domain mapping, subcellular fractionation, siRNA knockdown with phosphorylation and signaling readouts\",\n      \"pmids\": [\"28659470\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which NAP1L1 stabilizes RELA protein levels is unclear\",\n        \"Whether NAP1L1's nuclear histone chaperone function is required for its role in innate immune signaling is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Establishing NAP1L1 as a cytoplasmic proliferative effector through its interaction with HDGF: the NAP1L1–HDGF complex activates c-Jun-dependent CCND1/CDK4/CDK6 expression, a mechanism validated across glioma and later independently in ovarian cancer.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence co-localization, siRNA/shRNA knockdown with functional rescue, xenograft models (glioma 2018, ovarian cancer 2022)\",\n      \"pmids\": [\"34959221\", \"35351053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct biochemical mechanism by which NAP1L1 activates HDGF or promotes c-Jun recruitment is not defined\",\n        \"Whether NAP1L1's histone-binding domain is required for the HDGF interaction is unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connecting NAP1L1 to developmental chromatin regulation: it promotes SETD1A-mediated H3K4me3 at the RassF10 promoter, and loss of Nap1l1 disrupts neural progenitor proliferation and cortical neurogenesis — a defect rescued by RassF10 overexpression.\",\n      \"evidence\": \"CRISPR-Cas9 KO, in utero electroporation, RNA-seq, H3K4me3 ChIP, genetic rescue in mouse cortex\",\n      \"pmids\": [\"29490266\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether NAP1L1 physically interacts with SETD1A/COMPASS or acts indirectly is not resolved\",\n        \"Genome-wide targets of NAP1L1-dependent H3K4me3 beyond RassF10 are unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placing NAP1L1 within a miRNA-mediated oncogenic feedback loop: miR-532-5p directly targets NAP1L1 mRNA, and ETS1 transcriptionally represses miR-532-5p, creating a self-reinforcing ETS1→low miR-532-5p→high NAP1L1→P-ERK→ETS1 circuit in renal cell carcinoma.\",\n      \"evidence\": \"Luciferase 3′-UTR reporter, ChIP for ETS1 at miR-532-5p promoter, xenograft proliferation assays\",\n      \"pmids\": [\"30082686\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How NAP1L1 protein activates ERK phosphorylation is mechanistically undefined\",\n        \"Whether miR-532-5p regulation of NAP1L1 operates in normal tissues is untested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining a gene-specific linker histone eviction pathway: p300 recruits NAP1L1 to activator-occupied chromatin, where NAP1L1 evicts H1 and H2A-H2B to derepress transcription, validated at the endogenous CD40 locus in B cells.\",\n      \"evidence\": \"Reconstituted in vitro chromatin transcription with purified components, direct binding assays, ChIP at CD40 in primary B cells\",\n      \"pmids\": [\"30902546\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether NAP1L1-mediated H1 eviction is a general mechanism at all p300-dependent promoters or gene-specific remains open\",\n        \"Structural basis of the p300–NAP1L1 interaction is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how NAP1L1's nuclear histone chaperone functions (H1 eviction, H3K4me3 facilitation, promoter methylation) are coordinated with its cytoplasmic proliferative signaling roles (HDGF/c-Jun, innate immunity), and whether distinct NAP1L1 pools or post-translational modifications partition these activities.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structural model for full-length human NAP1L1 with bound partners\",\n        \"Post-translational modifications that regulate nuclear-cytoplasmic partitioning are uncharacterized\",\n        \"Genome-wide chromatin occupancy map for NAP1L1 is lacking\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [2, 5, 6]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 5, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3, 8]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 5, 6]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 5, 6]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 10]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CSB\",\n      \"HDGF\",\n      \"p300\",\n      \"SETD1A\",\n      \"NS5A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NAP1L1 is a histone chaperone that facilitates nucleosome assembly and disassembly by binding H2A-H2B and H3-H4 with nanomolar affinity, shielding histone interaction surfaces from nonproductive DNA contacts and lowering the thermodynamic barrier to nucleosome formation in a two-step process [PMID:18728017, PMID:20347425, PMID:23973327, PMID:23050009]. Beyond canonical nucleosome assembly, NAP1L1 evicts linker histone H1 through recruitment by activator-bound p300 to enable gene-specific transcription [PMID:30902546], enhances CSB-mediated nucleosome remodeling during transcription-coupled DNA repair [PMID:28369616], stimulates RAD54/RAD51-dependent homologous recombination by evicting H1 from higher-order chromatin at double-strand breaks [PMID:24798879], and controls cohesin release during mitosis by antagonizing PP2A-mediated dephosphorylation of the cohesin subunit SA [PMID:24086141]. CK2 phosphorylation promotes its nuclear import for S-phase functions [PMID:18086883], and glutamylation regulates its control of linker histone dynamics on mitotic chromosomes [PMID:25897082]. In mammalian cells, NAP1L1 maintains neural progenitor proliferation via SETD1A-mediated H3K4me3 at the RassF10 promoter [PMID:29490266] and promotes tumor cell proliferation through epigenetic silencing of the CDKN1C/p57 tumor suppressor [PMID:25071868] and activation of a HDGF/c-Jun/CCND1 signaling axis [PMID:34959221, PMID:35351053].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing that NAP1 functions in mitotic progression beyond histone chaperoning resolved the question of whether NAP1 acts solely as a nucleosome assembly factor, revealing it is required for cyclin Clb2-dependent mitotic functions including spindle elongation and bud morphogenesis.\",\n      \"evidence\": \"NAP1 deletion in S. cerevisiae combined with Clb2 functional assays and cell-cycle phenotyping\",\n      \"pmids\": [\"7622567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NAP1 enables Clb2 mitotic functions was unclear\", \"No direct binding between NAP1 and Clb2/CDC28 demonstrated\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Discovery that NAP1 physically associates with the kinase Gin4 and together with Clb2 activates Gin4 phosphorylation established NAP1 as a scaffold linking cyclin-CDK complexes to downstream mitotic kinase cascades.\",\n      \"evidence\": \"Affinity chromatography, in vivo phosphorylation and kinase assays, genetic epistasis in S. cerevisiae\",\n      \"pmids\": [\"9214386\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NAP1 serves as a kinase substrate or purely as a scaffold was unresolved\", \"Relevance to mammalian NAP1L1 not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstration that NAP1 deletion causes genome-wide transcriptional changes clustered along chromosomes, combined with the finding that NAP1 shuttles between cytoplasm and nucleus via a functional NES required for mitotic function, established that nucleocytoplasmic trafficking is essential for NAP1's chromatin-regulatory role.\",\n      \"evidence\": \"Microarray profiling of Δnap1 yeast; GFP localization, NES mutagenesis, and complementation assays in S. cerevisiae\",\n      \"pmids\": [\"12788058\", \"12944491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the transcriptional changes reflect direct nucleosome assembly defects or indirect effects was unknown\", \"Nuclear import mechanism not yet identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Three advances defined NAP1's biochemical mechanism: CK2 phosphorylation at three serines promotes nuclear import and S-phase progression; NAP1 modulates H3/H4 tetramer-dimer equilibrium to alter DNA supercoiling topology; and the corepressor Alien enhances NAP1-mediated nucleosome assembly at specific promoters.\",\n      \"evidence\": \"MS-based phosphosite mapping with CK2 kinase assays and mutagenesis in yeast; DNA supercoiling and crosslinking assays in vitro; co-IP, GST pulldown, ChIP, and nucleosome assembly assays\",\n      \"pmids\": [\"18086883\", \"17595058\", \"17339334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CK2-phosphorylated NAP1 is recognized by the nuclear import machinery was unknown\", \"Whether H3/H4 tetramer-dimer modulation occurs in vivo was untested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Quantitative measurement of NAP1-histone binding affinities (low nM for both H2A-H2B and H3-H4, two histone fold dimers per NAP1 dimer) established the thermodynamic framework explaining how histones transfer from chaperone to DNA during nucleosome assembly.\",\n      \"evidence\": \"Quantitative fluorescence-based binding assays with purified yeast Nap1 and histone complexes\",\n      \"pmids\": [\"18728017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding affinities for human NAP1L1 not measured\", \"Kinetic rates of histone transfer not determined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Two studies expanded NAP1's functional repertoire: in Drosophila, NAP1 links the RLAF silencing complex to Notch-target genes by directing high nucleosome density and coordinating H3 deacetylation/H3K4me3 demethylation; in yeast, NAP1 forms a RanGTP-insensitive import complex with the histone variant Htz1/H2B and karyopherin Kap114 for Htz1 nuclear import.\",\n      \"evidence\": \"Proteomics, co-IP, ChIP, nucleosome density analysis in Drosophila; copurification and nuclear import assays with RanGTP competition in S. cerevisiae\",\n      \"pmids\": [\"19782028\", \"19929865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RLAF-NAP1 interaction occurs in mammalian cells was unknown\", \"How NAP1 discriminates Htz1 from canonical H2A was unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Thermodynamic reconstitution proved that NAP1 promotes nucleosome assembly not by actively depositing histones but by eliminating competing nonnucleosomal histone-DNA complexes, lowering the free energy barrier to correct nucleosome formation.\",\n      \"evidence\": \"FRET, sedimentation, MNase assays in Δnap1 yeast, and transcription reporters\",\n      \"pmids\": [\"20347425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other chaperones share this thermodynamic mechanism was not tested\", \"Contribution of individual histone pairs to the energy barrier was unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Structural studies using PELDOR spectroscopy resolved a long-standing question by showing NAP1-family chaperones bind H3-H4 as a tetramer (not dimers), and this tetrameric substrate can be used for nucleosome assembly and chaperone-mediated acetylation.\",\n      \"evidence\": \"Pulsed electron double resonance, protein crosslinking, in vitro nucleosome assembly and acetylation assays\",\n      \"pmids\": [\"21329878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural model of NAP1-H3/H4 tetramer complex not available\", \"Whether tetramer vs. dimer mode is regulated in vivo was unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Single-molecule magnetic tweezers revealed nucleosome assembly by NAP1 proceeds in two kinetic steps—initial DNA compaction followed by canonical nucleosome formation with a characteristic linking number change—providing a real-time mechanistic framework.\",\n      \"evidence\": \"Single-molecule magnetic tweezers measuring DNA extension and linking number\",\n      \"pmids\": [\"23050009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the two-step pathway applies to all histone variants was untested\", \"Rate-limiting step not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Three discoveries in 2013 deepened understanding of NAP1's histone-shielding, mitotic, and transcription-elongation functions: HDX-MS showed NAP1 shields H2A-H2B interaction surfaces and organizes two H2A-H2B copies into a pseudo-tetramer; in Drosophila, NAP1 controls mitotic cohesin release by displacing PP2A from cohesin in a cell-cycle-regulated manner; and in yeast, NAP1 modulates Rtt109-dependent H3K9 acetylation during transcription elongation to suppress cryptic transcription.\",\n      \"evidence\": \"HDX-MS with mutagenesis and in vivo validation; proteomics, co-IP, ChIP-seq, and genetic rescue in Drosophila; genetic suppression and ChIP in S. cerevisiae\",\n      \"pmids\": [\"23973327\", \"24086141\", \"23401858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of NAP1-PP2A antagonism on cohesin was unknown\", \"Whether NAP1's elongation role is conserved in mammals was untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two studies demonstrated direct roles in mammalian DNA repair and tumor biology: NAP1L1 accumulates at DSB sites, binds RAD54, and enhances homologous recombination by evicting H1 from higher-order chromatin; separately, NAP1L1 binds the CDKN1C/p57 promoter and promotes its methylation-mediated silencing, driving pancreatic neuroendocrine tumor proliferation.\",\n      \"evidence\": \"ChIP at DSBs, siRNA knockdown repair assay, in vitro RAD51/RAD54 HR reconstitution; ChIP of NAP1L1 at CDKN1C promoter, bisulfite methylation, orthotopic tumor model\",\n      \"pmids\": [\"24798879\", \"25071868\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which DNA methyltransferase NAP1L1 recruits to CDKN1C was unknown\", \"Whether NAP1L1's HR function requires its histone chaperone activity or is a distinct activity was unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Discovery that glutamylation of NAP1 is required for linker histone H1 dynamics and mitotic chromosome condensation in Xenopus established post-translational charge modification as a regulatory switch controlling NAP1's histone chaperone activity.\",\n      \"evidence\": \"Immunodepletion and add-back of wild-type vs. glutamylation-mutant Nap1 in Xenopus egg extracts, FRAP, chromosome condensation assays\",\n      \"pmids\": [\"25897082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the glutamylase and deglutamylase acting on NAP1L1 was unknown\", \"Whether glutamylation regulates NAP1 in interphase was not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Single-molecule FRET studies showed NAP1L1 enhances CSB chromatin remodeling by suppressing non-productive DNA binding and reducing remodeler pausing, establishing NAP1L1 as a cofactor for transcription-coupled nucleotide excision repair; separately, HCV NS5A was shown to sequester NAP1L1 in the cytoplasm (and degrade it in genotype 2), impairing IRF3/TBK1 antiviral signaling.\",\n      \"evidence\": \"smFRET and TIRF microscopy with purified NAP1L1/CSB; co-IP, domain mapping, subcellular fractionation, siRNA knockdown with pathway readouts in hepatoma cells\",\n      \"pmids\": [\"28369616\", \"28659470\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NAP1L1 enhances other chromatin remodelers besides CSB was untested\", \"Mechanism by which NAP1L1 loss reduces RELA levels was unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"NAP1L1's developmental and oncogenic roles were elaborated: in cortical development, NAP1L1 maintains neural progenitor proliferation by promoting SETD1A-dependent H3K4me3 at the RassF10 promoter; in cancer, NAP1L1 activates PI3K/AKT/mTOR signaling and participates in a KRAS/P-ERK/ETS1 positive feedback loop.\",\n      \"evidence\": \"CRISPR-KO mice, in utero electroporation, ChIP for H3K4me3, RassF10 rescue; luciferase 3'UTR assays, ChIP for ETS1, Western blotting in RCC and HCC cells\",\n      \"pmids\": [\"29490266\", \"30082686\", \"29572888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between NAP1L1 and SETD1A was not demonstrated\", \"How NAP1L1 activates PI3K/AKT/mTOR at the biochemical level remains unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Two conceptual advances: in vitro chromatin reconstitution showed NAP1 is recruited by activator-bound p300 to evict linker histone H1 and enable gene-specific transcription (validated at the CD40 locus in B cells); separately, yeast Nap1 was shown to serve as a dedicated ribosomal protein chaperone for Rps6, extending its chaperone repertoire beyond histones.\",\n      \"evidence\": \"In vitro chromatin transcription system, co-IP of NAP1 with p300, B cell CD40 induction; TAP screen, in vitro solubility assay, genetic interaction in yeast\",\n      \"pmids\": [\"30902546\", \"31062022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Rps6 chaperoning is conserved in mammalian NAP1L1 was not tested\", \"The structural basis of NAP1-p300 interaction was unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Independent studies in glioma and ovarian cancer identified a NAP1L1→HDGF→c-Jun→CCND1/CDK4/CDK6 proliferative axis, with co-IP confirming direct NAP1L1-HDGF interaction and HDGF rescue reversing NAP1L1 knockdown effects, establishing a non-chromatin oncogenic signaling role.\",\n      \"evidence\": \"Co-IP, immunofluorescence co-localization, siRNA knockdown, HDGF rescue, in vivo tumor model in glioma (2021) and ovarian cancer (2022) cells\",\n      \"pmids\": [\"34959221\", \"35351053\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether NAP1L1-HDGF interaction requires NAP1L1's histone-binding domain was untested\", \"Direct mechanism linking NAP1L1 to HDGF activation of c-Jun is unclear\", \"Findings from cancer cell lines without genetic validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Major open questions include: the structural basis of NAP1L1 interactions with non-histone partners (p300, CSB, HDGF, cohesin), the mechanism by which NAP1L1 directs DNA methyltransferase activity to the CDKN1C promoter, whether its ribosomal protein chaperone function is conserved in mammals, and how post-translational modifications (CK2 phosphorylation, glutamylation) are coordinated to partition NAP1L1 among its diverse nuclear and cytoplasmic functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of full-length NAP1L1 with any partner complex\", \"Integration of chromatin vs. non-chromatin functions is unexplored\", \"In vivo significance of many cancer-context findings requires genetic models\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [8, 12, 13, 14, 15, 21]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [12, 13, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 22, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 5, 19, 20, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 23, 30]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [16, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [3, 7, 8, 12, 14, 15, 21, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 5, 16]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [19, 22]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [9, 17, 25, 29]}\n    ],\n    \"complexes\": [\n      \"RLAF complex\"\n    ],\n    \"partners\": [\n      \"CSB\",\n      \"RAD54\",\n      \"HDGF\",\n      \"p300\",\n      \"Kap114\",\n      \"Gin4\",\n      \"Alien\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}