{"gene":"SMARCA5","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":1998,"finding":"SMARCA5 encodes hSNF2H, a human homolog of Drosophila ISWI with a conserved ATPase domain characteristic of the SWI2/SNF2 family, mapped to chromosome 4q31.1–q31.2, suggesting a role in chromatin remodeling in humans.","method":"cDNA cloning, sequence homology analysis, FISH mapping, Northern blot","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 3 — foundational cloning/characterization paper, single lab, sequence and expression analysis only","pmids":["9730600"],"is_preprint":false},{"year":2001,"finding":"Mammalian SNF2H (SMARCA5) forms an ACF1-SNF2H chromatin-remodeling complex (related to Drosophila ACF/CHRAC) that assembles regularly spaced nucleosomal arrays in an ATP-dependent manner, with Snf2h enriched in proliferating cells consistent with replication-associated chromatin assembly.","method":"cDNA cloning, differential expression analysis, biochemical fractionation","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — expression and complex membership inferred; functional evidence from related Drosophila work","pmids":["11359880"],"is_preprint":false},{"year":2001,"finding":"SNF2H (SMARCA5) is the catalytic ATPase subunit of the nucleolar remodeling complex NoRC (with TIP5), which interacts with TTF-I and induces ATP- and histone H4 tail-dependent nucleosome sliding at the rDNA locus.","method":"Co-immunoprecipitation, recombinant complex reconstitution, nucleosome sliding assay, colocalization with UBF in nucleolus","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 — biochemical reconstitution of complex, in vitro nucleosome sliding assay, subcellular colocalization, multiple orthogonal methods","pmids":["11532953"],"is_preprint":false},{"year":2002,"finding":"SMARCA5/SNF2H forms the WICH complex with WSTF (Williams Syndrome Transcription Factor), and both localize to replicating pericentric heterochromatin; mouse WSTF interacts specifically with the SNF2H isoform of ISWI.","method":"Purification from Xenopus egg extract, co-immunoprecipitation in mouse cells, immunofluorescence colocalization at heterochromatin replication foci","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, biochemical purification to homogeneity, direct localization at replication foci with functional context","pmids":["11980720"],"is_preprint":false},{"year":2002,"finding":"An ACF1-SNF2H (SMARCA5) complex is specifically required for DNA replication through pericentromeric heterochromatin; RNAi depletion of ACF1 impairs late-S-phase replication of heterochromatin, and SNF2H depletion slows replication progression throughout S phase.","method":"RNAi depletion, BrdU incorporation/immunofluorescence, cell-cycle analysis, expression of ACF1 mutant unable to interact with SNF2H","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean RNAi knockdowns of both subunits, specific phenotypic readout, dominant-negative rescue, multiple orthogonal methods in mammalian cells","pmids":["12434153"],"is_preprint":false},{"year":2003,"finding":"Snf2h (SMARCA5) is required for early mouse development; Snf2h-null embryos die at the periimplantation stage with growth arrest and death of both trophectoderm and inner cell mass; reduction of Snf2h in human CD34+ hematopoietic progenitors inhibits cytokine-induced erythropoiesis.","method":"Gene targeting (null mutation in mice), blastocyst outgrowth assay, antisense inhibition in human hematopoietic progenitors, in vitro differentiation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — genetic knockout with defined developmental phenotype, replicated in two biological systems (mouse embryo and human progenitors)","pmids":["14617767"],"is_preprint":false},{"year":2004,"finding":"SMARCA5/SNF2H is recruited to DNA replication foci through direct interaction of its partner WSTF with PCNA; depletion of WSTF or SNF2H causes compaction of newly replicated chromatin and increases heterochromatin markers including HP1β.","method":"Co-immunoprecipitation, GST pulldown, immunofluorescence at replication foci, RNAi knockdown, chromatin fractionation","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — direct protein interaction demonstrated, RNAi knockdown with specific chromatin phenotype, multiple orthogonal methods","pmids":["15543136"],"is_preprint":false},{"year":2004,"finding":"SMARCA5/SNF2H (hSNF2H) physically interacts with DNMT3B, HDAC1, HDAC2, HP1 proteins, and Suv39h1 in heterochromatic regions; endogenous hSNF2H is associated with DNA methyltransferase activity.","method":"Co-immunoprecipitation, GST pulldown, immunofluorescence colocalization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP/pulldown per interaction, single lab","pmids":["15120635"],"is_preprint":false},{"year":2004,"finding":"SNF2H (SMARCA5) and BRG1 (SWI/SNF ATPase) both stimulate V(D)J cleavage of nucleosomal substrates by RAG proteins in an ATP-dependent manner, with SNF2H acting through nucleosome remodeling to increase DNA accessibility.","method":"In vitro V(D)J cleavage assay on polynucleosomal arrays, recombinant SNF2H remodeling","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro reconstitution assay with defined substrate, single lab","pmids":["15201272"],"is_preprint":false},{"year":2009,"finding":"SNF2H (SMARCA5) is a major mammalian ISWI ATPase; loss of SNF2H decreases nucleosomal phasing and increases linker lengths in vivo, and is required for CTCF binding and chromosomal insulation of topologically associated domains.","method":"Genetic knockout of SNF2H in mouse embryonic stem cells, MNase-seq, ChIP-seq for transcription factor binding, Hi-C for chromosomal folding","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with multiple genome-wide readouts, multiple orthogonal methods, highly cited","pmids":["30996347"],"is_preprint":false},{"year":2010,"finding":"SMARCA5 is part of the RSF (remodeling and spacing factor) complex with RSF-1; knockdown of SMARCA5 in breast cancer cells decreases cell proliferation and invasion, arrests the cell cycle, downregulates cyclin A and MMP2, and upregulates p21.","method":"siRNA knockdown, colony formation assay, Matrigel invasion assay, flow cytometry, western blot","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 3 — loss-of-function with defined cellular phenotype but no in-depth pathway placement, single lab","pmids":["25377162"],"is_preprint":false},{"year":2012,"finding":"SMARCA5/SNF2H is recruited to DNA double-strand breaks in a PARP1-dependent manner; SMARCA5 interacts with RNF168 (which becomes poly(ADP-ribosyl)ated) in a DNA damage- and PARP-dependent manner, and promotes RNF168 accumulation at DSBs, thereby facilitating ubiquitin conjugation and BRCA1 assembly; SMARCA5 depletion renders cells sensitive to ionizing radiation and causes DSB repair defects.","method":"Live cell imaging, co-immunoprecipitation, RNAi depletion, immunofluorescence, clonogenic survival, comet assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, direct protein interaction shown, functional consequences of depletion established with specific repair readouts","pmids":["23264744"],"is_preprint":false},{"year":2014,"finding":"SMARCA5/SNF2H and its binding partners ACF1 and WSTF are rapidly recruited to UV-C-induced DNA damage in a transcription- and histone-modification-dependent manner; recruitment requires the SWI2/SNF2-ATPase and SLIDE domains of SMARCA5; SMARCA5 facilitates CSB binding to lesion-stalled RNA Pol II and promotes transcription recovery; after initial recruitment, SMARCA5 relocalizes away from DNA damage center in a HAND-domain-dependent manner.","method":"Live cell imaging (laser micro-irradiation), domain deletion mutants, siRNA knockdown, transcription recovery assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — domain mapping with functional validation, live imaging, multiple orthogonal approaches, mechanistic detail on domain requirements","pmids":["24990377"],"is_preprint":false},{"year":2014,"finding":"ACF1-SNF2H (SMARCA5) ISWI complex is required for Artemis-dependent DSB repair in heterochromatin; ACF1-SNF2H requires RNF20 for binding to heterochromatic DSBs and functions downstream of pKAP-1-mediated CHD3.1 dispersal to relax compacted chromatin; CHD3.1 and ACF1-SNF2H display counteractive chromatin remodeling activities.","method":"siRNA knockdown, live-cell imaging, comet assay, epistasis analysis, chromatin compaction assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis between CHD3.1 and ACF1-SNF2H, pathway placement in DSB repair, multiple orthogonal methods","pmids":["25533843"],"is_preprint":false},{"year":2014,"finding":"NuMA interacts with SMARCA5/SNF2H via co-immunoprecipitation, regulates SNF2H diffusion in the nucleoplasm, and controls its accumulation at DNA double-strand breaks; cells with silenced NuMA show reduced chromatin decompaction after DNA cleavage and impaired homologous recombination repair.","method":"Co-immunoprecipitation, FRAP, siRNA knockdown, DR-GFP reporter assay, laser micro-irradiation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein interaction and FRAP, KD with defined repair phenotype, single lab","pmids":["24753406"],"is_preprint":false},{"year":2014,"finding":"SMARCA5 (Smarca5) supports CTCF binding to target sites on chromatin, facilitates CTCF's enhancer-blocking function at the ICR, and is recruited with CTCF and the Cohesin complex to the SPI1 gene enhancer during myeloid differentiation, where it helps control PU.1 expression.","method":"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, siRNA knockdown, AZA-mediated demethylation experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 — ChIP and co-IP in physiological context, single lab, functional follow-up of CTCF–SMARCA5 interaction","pmids":["24498324"],"is_preprint":false},{"year":2017,"finding":"Conditional deletion of Smarca5 at the onset of definitive hematopoiesis causes late fetal anemia; hematopoietic stem and progenitor cells accumulate but cannot mature; loss of Smarca5 leads to increased p53 levels phosphorylated at S15 (DNA damage) and acetylated at K376 (CBP/p300), activation of p53 targets, and G2/M block in basophilic erythroblasts.","method":"Conditional gene knockout (Vav1-iCre and Epor-iCre), flow cytometry, western blot, 4-OHT-mediated ex vivo deletion","journal":"Stem cells (Dayton, Ohio)","confidence":"High","confidence_rationale":"Tier 2 — two independent conditional KO models with defined molecular and cellular phenotypes, multiple readouts","pmids":["28276606"],"is_preprint":false},{"year":2019,"finding":"Loss of SNF2H (SMARCA5) in mouse embryonic stem cells decreases nucleosomal phasing and increases linker lengths; SNF2H loss selectively impairs binding of CTCF but not REST, revealing that different transcription factors rely on distinct remodeling pathways, and that SNF2H is required for topological insulation at TAD boundaries.","method":"Genetic knockout, MNase-seq, ATAC-seq, ChIP-seq, Hi-C","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO with multiple genome-wide orthogonal assays, replicated findings","pmids":["30996347"],"is_preprint":false},{"year":2021,"finding":"Smarca5 interacts with nucleolin to promote chromatin accessibility at promoters of hematopoiesis-related genes in fetal HSPCs, thereby facilitating genomic binding of p300/CBP/H3K27ac to upregulate expression of bcl11ab and other hematopoietic regulators.","method":"Co-immunoprecipitation, ATAC-seq, RNA-seq, ChIP-seq, zebrafish genetic model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — direct protein interaction (co-IP), chromatin accessibility (ATAC-seq), genome-wide binding (ChIP-seq), in vivo zebrafish model, multiple orthogonal methods","pmids":["32756943"],"is_preprint":false},{"year":2022,"finding":"SMARCA5 interacts with the NUP98-NSD1 oncofusion protein within phase-separated nuclear condensates; SMARCA5 is an essential mediator of NUP98-NSD1-driven hematopoietic cell transformation, with its enzymatic activity (not condensate formation) required for maintenance of the transformed phenotype.","method":"Affinity purification–mass spectrometry, proximity ligation assay, inducible knockdown, pharmacological inhibition, methylcellulose colony assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 — AP-MS interaction validated by PLA, functional role established by KD and pharmacological targeting, single lab","pmids":["35073946"],"is_preprint":false},{"year":2022,"finding":"The lncRNA lncMREF interacts with Smarca5 in differentiating muscle satellite cells to promote chromatin accessibility, thereby facilitating genomic binding of p300/CBP/H3K27ac and upregulating expression of myogenic regulators including MyoD, promoting myogenic differentiation and muscle regeneration.","method":"RNA immunoprecipitation, ATAC-seq, ChIP-seq, co-immunoprecipitation, loss-of-function/gain-of-function in vitro and in vivo","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — direct RNA–protein interaction shown, chromatin accessibility and histone modification changes measured by orthogonal genome-wide methods, in vivo and in vitro validation","pmids":["36200826"],"is_preprint":false},{"year":2023,"finding":"SMARCA5 is continuously required to maintain nucleosome repeat length and nucleosomal phasing in human cells; acute degradation of endogenous SMARCA5 (via auxin-inducible degron) rapidly increases global nucleosome repeat length; SMARCA5 co-localizes with CTCF and H2A.Z, and its loss causes rapid loss of CTCF DNA binding and disruption of nucleosomal phasing around CTCF sites; SMARCA5 is specifically required for nucleosome spacing control at G1/S and during S phase.","method":"Auxin-inducible degron system (endogenous tagging), MNase-seq, ChIP-seq, cell-cycle synchronization in three human cell lines","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 — acute degradation system with endogenous tagging, genome-wide MNase-seq, multiple cell lines, orthogonal approaches","pmids":["36630954"],"is_preprint":false},{"year":2010,"finding":"An in-frame fusion of EWSR1 (exons 1–7) to SMARCA5 (exons 14–32) was identified in an extraskeletal Ewing sarcoma/PNET with t(4;22)(q31;q12); NIH3T3 cells expressing EWSR1-hSNF2H exhibit anchorage-independent growth; deletion of the C-terminus (SLIDE/SANT motifs) impairs, and deletion of the SNF2_N domain fully abrogates, NIH3T3 cell transformation.","method":"FISH, RACE, RT-PCR, sequencing, soft-agar colony formation assay, domain deletion analysis","journal":"Modern pathology","confidence":"Medium","confidence_rationale":"Tier 2–3 — domain mapping with functional transformation readout, single lab","pmids":["21113140"],"is_preprint":false}],"current_model":"SMARCA5 (SNF2H) is the catalytic ATPase subunit of multiple mammalian ISWI chromatin-remodeling complexes (including NoRC, WICH/WSTF-ISWI, ACF1-SNF2H/CHRAC, and RSF) that use ATP hydrolysis to slide nucleosomes and space them into regular arrays; it is continuously required to maintain nucleosomal phasing and linker DNA length genome-wide, supports CTCF and H2A.Z-associated chromatin organization, is recruited to DNA replication foci via WSTF-PCNA interaction to preserve chromatin states, is recruited to DNA double-strand breaks via PARP1/poly(ADP-ribose) to facilitate RNF168-dependent ubiquitin signaling and repair, is recruited to UV-damage-stalled transcription sites via its ATPase and SLIDE domains to enable transcription recovery, and interacts with partners including nucleolin, lncMREF, and NUP98-NSD1 to regulate hematopoietic and myogenic differentiation programs."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of SMARCA5 as the human ISWI homolog established that SWI2/SNF2-family ATP-dependent chromatin remodeling is conserved in mammals.","evidence":"cDNA cloning, sequence homology, FISH mapping to 4q31","pmids":["9730600"],"confidence":"Medium","gaps":["No biochemical activity demonstrated","No complex membership defined"]},{"year":2001,"claim":"Biochemical reconstitution revealed that SNF2H forms distinct ISWI complexes (ACF1-SNF2H and NoRC with TIP5), each capable of ATP-dependent nucleosome sliding, establishing SMARCA5 as a shared catalytic engine for multiple remodeling assemblies.","evidence":"Recombinant complex reconstitution, nucleosome sliding assays, co-IP, nucleolar colocalization","pmids":["11532953","11359880"],"confidence":"High","gaps":["Functional distinction between complexes in vivo unclear","No genome-wide chromatin phenotype yet"]},{"year":2002,"claim":"Discovery of the WICH complex (WSTF–SNF2H) at replication foci and demonstration that ACF1-SNF2H is required for heterochromatin replication linked SMARCA5 to DNA replication-coupled chromatin assembly.","evidence":"Co-IP and biochemical purification from Xenopus extracts, RNAi in mammalian cells, BrdU incorporation, cell-cycle analysis","pmids":["11980720","12434153"],"confidence":"High","gaps":["Mechanism by which remodeling facilitates replication fork progression unresolved","Relative contributions of WICH vs. ACF unclear"]},{"year":2003,"claim":"Genetic knockout established that Snf2h is essential for periimplantation development and hematopoietic erythropoiesis, demonstrating that ISWI remodeling is indispensable for mammalian cell viability and lineage differentiation.","evidence":"Gene targeting in mice (null mutation), blastocyst outgrowth, antisense knockdown in human CD34+ progenitors","pmids":["14617767"],"confidence":"High","gaps":["Downstream chromatin targets in embryo not identified","Molecular basis of erythroid block unclear"]},{"year":2004,"claim":"The mechanism of SMARCA5 recruitment to replication foci was resolved: WSTF directly binds PCNA, tethering SNF2H to nascent chromatin; loss of either subunit causes aberrant heterochromatin compaction, revealing WICH as a chromatin maintenance factor during replication.","evidence":"Co-IP, GST pulldown (WSTF–PCNA), RNAi, chromatin fractionation","pmids":["15543136"],"confidence":"High","gaps":["Whether WICH remodels specific loci vs. acts globally at forks not determined"]},{"year":2012,"claim":"SMARCA5 was placed in the DNA double-strand break repair pathway: PARP1-dependent recruitment of SNF2H to DSBs promotes RNF168 accumulation and ubiquitin signaling, enabling BRCA1 assembly and efficient repair.","evidence":"Live-cell imaging, co-IP, RNAi, clonogenic survival, comet assay","pmids":["23264744"],"confidence":"High","gaps":["Direct biochemical mechanism of RNF168 activation by SNF2H not shown","Relative contribution vs. other remodelers at DSBs unclear"]},{"year":2014,"claim":"Multiple studies dissected SMARCA5's roles in specialized DNA damage contexts: at UV lesions, its ATPase and SLIDE domains enable CSB binding and transcription recovery; at heterochromatic DSBs, the ACF1-SNF2H complex acts downstream of KAP-1/CHD3.1 to relax compacted chromatin for Artemis-dependent repair; and NuMA controls SNF2H nucleoplasmic dynamics and accumulation at breaks.","evidence":"Laser micro-irradiation with domain mutants, siRNA epistasis with CHD3.1/RNF20/KAP-1, FRAP, DR-GFP reporter","pmids":["24990377","25533843","24753406"],"confidence":"High","gaps":["Whether NuMA–SNF2H interaction is direct or bridged not resolved","Structural basis of SLIDE/ATPase domain requirement at UV lesions unknown"]},{"year":2017,"claim":"Conditional hematopoietic knockout revealed that Smarca5 is required for erythroid maturation in vivo; its loss activates p53-dependent DNA damage checkpoints and G2/M arrest in erythroblasts, linking chromatin remodeling to genome integrity during rapid proliferation.","evidence":"Conditional KO (Vav1-iCre, Epor-iCre), flow cytometry, western blot","pmids":["28276606"],"confidence":"High","gaps":["Whether p53 activation reflects replication stress or transcriptional defects not distinguished"]},{"year":2019,"claim":"Genome-wide analyses in SNF2H-knockout ESCs established that SMARCA5 is the dominant nucleosome spacing factor: its loss increases nucleosome repeat length, selectively abolishes CTCF binding (but not REST), and disrupts TAD insulation, revealing transcription-factor-specific dependence on ISWI remodeling.","evidence":"Genetic KO in mESCs, MNase-seq, ATAC-seq, ChIP-seq, Hi-C","pmids":["30996347"],"confidence":"High","gaps":["Mechanism by which spacing enables CTCF but not REST binding unresolved","Whether other ISWI ATPases compensate partially not addressed"]},{"year":2021,"claim":"SMARCA5 was shown to cooperate with nucleolin to open chromatin at hematopoietic gene promoters, enabling p300/CBP recruitment and H3K27ac deposition, providing a direct mechanism for how ISWI remodeling controls lineage-specific transcription.","evidence":"Co-IP, ATAC-seq, ChIP-seq, RNA-seq in zebrafish HSPCs","pmids":["32756943"],"confidence":"High","gaps":["Whether nucleolin–SMARCA5 interaction is conserved in mammalian HSPCs not tested","Specificity of nucleolin vs. other SMARCA5 partners at these loci unclear"]},{"year":2022,"claim":"Two studies extended SMARCA5's partnership repertoire: it interacts with the NUP98-NSD1 oncofusion in phase-separated condensates and is essential for NUP98-NSD1-driven leukemic transformation; separately, the lncRNA lncMREF recruits SMARCA5 to myogenic gene promoters to open chromatin for p300/H3K27ac and drive muscle regeneration.","evidence":"AP-MS, PLA, inducible KD, pharmacological inhibition (NUP98-NSD1); RIP, ATAC-seq, ChIP-seq, in vivo muscle regeneration (lncMREF)","pmids":["35073946","36200826"],"confidence":"High","gaps":["Whether lncMREF directly guides SMARCA5 to specific genomic loci or acts indirectly not established","Therapeutic window for SMARCA5 inhibition in NUP98-NSD1 leukemia unknown"]},{"year":2023,"claim":"Acute endogenous degradation of SMARCA5 proved that it is continuously required—not just during initial assembly—to maintain nucleosome repeat length and phasing throughout the cell cycle, with particular importance at G1/S and S phase for CTCF and H2A.Z site organization.","evidence":"Auxin-inducible degron at endogenous locus, MNase-seq, ChIP-seq, cell-cycle synchronization in three human cell lines","pmids":["36630954"],"confidence":"High","gaps":["How SMARCA5 activity is regulated during the cell cycle not defined","Whether continuous requirement reflects active repositioning or counteracting disruptive forces unclear"]},{"year":null,"claim":"Key unresolved questions include: how SMARCA5 is differentially allocated among its multiple complexes in a cell-type-specific manner; the structural basis for its selectivity toward CTCF-flanking nucleosomes; and whether SMARCA5 can be therapeutically targeted in oncogenic contexts without compromising normal chromatin homeostasis.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of full-length human SMARCA5 in complex with a partner subunit","Mechanism of cell-cycle-dependent regulation unknown","No therapeutic index established for SMARCA5 inhibition"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[2,4,8,9,12,17,21]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,8,9,21]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[2]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[14,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,7,19]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[9,17,21]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[2,9,17,18,20,21]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11,12,13,14]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[3,4,6,21]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,16,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5,16,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[15,18,20]}],"complexes":["NoRC (TIP5-SNF2H)","WICH (WSTF-SNF2H)","ACF/CHRAC (ACF1-SNF2H)","RSF (RSF1-SNF2H)"],"partners":["BAZ1A","BAZ2A","BAZ1B","RSF1","RNF168","PCNA","NCL","NUMA1"],"other_free_text":[]},"mechanistic_narrative":"SMARCA5 (SNF2H) is the catalytic ATPase subunit of multiple mammalian ISWI chromatin-remodeling complexes—including NoRC, WICH, ACF/CHRAC, and RSF—that hydrolyze ATP to slide and regularly space nucleosomes, thereby controlling genome-wide nucleosome repeat length, linker DNA length, and chromatin accessibility [PMID:11532953, PMID:36630954, PMID:30996347]. SMARCA5 is continuously required to maintain nucleosomal phasing and is essential for CTCF binding, enhancer insulation at TAD boundaries, and H2A.Z-associated chromatin organization; its acute depletion rapidly disrupts these features [PMID:30996347, PMID:36630954]. Beyond steady-state chromatin maintenance, SMARCA5 is recruited to DNA replication foci via WSTF–PCNA interaction to preserve chromatin states during S phase, and to DNA double-strand breaks via PARP1/poly(ADP-ribose) where it facilitates RNF168-dependent ubiquitin signaling and heterochromatic DSB repair [PMID:15543136, PMID:23264744, PMID:25533843]. SMARCA5 is essential for early embryonic development and hematopoietic differentiation, where it cooperates with nucleolin and lncRNAs such as lncMREF to open chromatin at lineage-specific gene promoters and enable p300/CBP-mediated H3K27 acetylation [PMID:14617767, PMID:28276606, PMID:32756943, PMID:36200826]."},"prefetch_data":{"uniprot":{"accession":"O60264","full_name":"SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 5","aliases":["Sucrose nonfermenting protein 2 homolog","hSNF2H"],"length_aa":1052,"mass_kda":121.9,"function":"ATPase that possesses intrinsic ATP-dependent nucleosome-remodeling activity (PubMed:12972596, PubMed:28801535). Catalytic subunit of ISWI chromatin-remodeling complexes, which form ordered nucleosome arrays on chromatin and facilitate access to DNA during DNA-templated processes such as DNA replication, transcription, and repair; this may require intact histone H4 tails (PubMed:10880450, PubMed:12198550, PubMed:12434153, PubMed:12972596, PubMed:23911928, PubMed:28801535). Within the ISWI chromatin-remodeling complexes, slides edge- and center-positioned histone octamers away from their original location on the DNA template (PubMed:28801535). Catalytic activity and histone octamer sliding propensity is regulated and determined by components of the ISWI chromatin-remodeling complexes (PubMed:28801535). The BAZ1A/ACF1-, BAZ1B/WSTF-, BAZ2A/TIP5- and BAZ2B-containing ISWI chromatin-remodeling complexes regulate the spacing of nucleosomes along the chromatin and have the ability to slide mononucleosomes to the center of a DNA template in an ATP-dependent manner (PubMed:14759371, PubMed:15543136, PubMed:28801535). The CECR2- and RSF1-containing ISWI chromatin-remodeling complexes do not have the ability to slide mononucleosomes to the center of a DNA template (PubMed:28801535). Binds to core histones together with RSF1, and is required for the assembly of regular nucleosome arrays by the RSF-5 ISWI chromatin-remodeling complex (PubMed:12972596). Involved in DNA replication and together with BAZ1A/ACF1 is required for replication of pericentric heterochromatin in S-phase (PubMed:12434153). Probably plays a role in repression of RNA polymerase I dependent transcription of the rDNA locus, through the recruitment of the SIN3/HDAC1 corepressor complex to the rDNA promoter (By similarity). Essential component of the WICH-5 ISWI chromatin-remodeling complex (also called the WICH complex), a chromatin-remodeling complex that mobilizes nucleosomes and reconfigures irregular chromatin to a regular nucleosomal array structure (PubMed:11980720, PubMed:15543136). The WICH-5 ISWI chromatin-remodeling complex regulates the transcription of various genes, has a role in RNA polymerase I transcription (By similarity). Within the B-WICH complex has a role in RNA polymerase III transcription (PubMed:16603771). Mediates the histone H2AX phosphorylation at 'Tyr-142', and is involved in the maintenance of chromatin structures during DNA replication processes (By similarity). Essential component of NoRC-5 ISWI chromatin-remodeling complex, a complex that mediates silencing of a fraction of rDNA by recruiting histone-modifying enzymes and DNA methyltransferases, leading to heterochromatin formation and transcriptional silencing (By similarity)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/O60264/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SMARCA5","classification":"Not 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Liver","url":"https://pubmed.ncbi.nlm.nih.gov/32807692","citation_count":31,"is_preprint":false},{"pmid":"24561830","id":"PMC_24561830","title":"ISWI chromatin remodeling: one primary actor or a coordinated effort?","date":"2014","source":"Current opinion in structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/24561830","citation_count":31,"is_preprint":false},{"pmid":"18786525","id":"PMC_18786525","title":"The chromatin remodelers ISWI and ACF1 directly repress Wingless transcriptional targets.","date":"2008","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/18786525","citation_count":31,"is_preprint":false},{"pmid":"24498324","id":"PMC_24498324","title":"Epigenetic control of SPI1 gene by CTCF and ISWI ATPase SMARCA5.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24498324","citation_count":30,"is_preprint":false},{"pmid":"23778407","id":"PMC_23778407","title":"The role of micro RNAs let7c, 100 and 218 expression and their target RAS, C-MYC, BUB1, RB, SMARCA5, LAMB3 and Ki-67 in prostate cancer.","date":"2013","source":"Clinics (Sao Paulo, Brazil)","url":"https://pubmed.ncbi.nlm.nih.gov/23778407","citation_count":30,"is_preprint":false},{"pmid":"35073946","id":"PMC_35073946","title":"SMARCA5 interacts with NUP98-NSD1 oncofusion protein and sustains hematopoietic cells transformation.","date":"2022","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/35073946","citation_count":29,"is_preprint":false},{"pmid":"21900490","id":"PMC_21900490","title":"The chromatin remodeler ISWI regulates the cellular response to hypoxia: role of FIH.","date":"2011","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/21900490","citation_count":29,"is_preprint":false},{"pmid":"32756943","id":"PMC_32756943","title":"Smarca5-mediated epigenetic programming facilitates fetal HSPC development in vertebrates.","date":"2021","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/32756943","citation_count":28,"is_preprint":false},{"pmid":"32022430","id":"PMC_32022430","title":"Nm23-H1 inhibits lung cancer bone-specific metastasis by upregulating miR-660-5p targeted SMARCA5.","date":"2020","source":"Thoracic cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32022430","citation_count":27,"is_preprint":false},{"pmid":"24414837","id":"PMC_24414837","title":"Regulation of ISWI chromatin remodelling activity.","date":"2014","source":"Chromosoma","url":"https://pubmed.ncbi.nlm.nih.gov/24414837","citation_count":26,"is_preprint":false},{"pmid":"33588586","id":"PMC_33588586","title":"Circ SMARCA5 Inhibited Tumor Metastasis by Interacting with SND1 and Downregulating the YWHAB Gene in Cervical Cancer.","date":"2021","source":"Cell transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/33588586","citation_count":26,"is_preprint":false},{"pmid":"18535655","id":"PMC_18535655","title":"Genetic identification of a network of factors that functionally interact with the nucleosome remodeling ATPase ISWI.","date":"2008","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18535655","citation_count":26,"is_preprint":false},{"pmid":"16468993","id":"PMC_16468993","title":"The ISWI and CHD1 chromatin remodelling activities influence ADH2 expression and chromatin organization.","date":"2006","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/16468993","citation_count":25,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":42306,"output_tokens":5525,"usd":0.104897},"stage2":{"model":"claude-opus-4-6","input_tokens":9096,"output_tokens":3445,"usd":0.197408},"total_usd":0.302305,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"SMARCA5 encodes hSNF2H, a human homolog of Drosophila ISWI with a conserved ATPase domain characteristic of the SWI2/SNF2 family, mapped to chromosome 4q31.1–q31.2, suggesting a role in chromatin remodeling in humans.\",\n      \"method\": \"cDNA cloning, sequence homology analysis, FISH mapping, Northern blot\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — foundational cloning/characterization paper, single lab, sequence and expression analysis only\",\n      \"pmids\": [\"9730600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Mammalian SNF2H (SMARCA5) forms an ACF1-SNF2H chromatin-remodeling complex (related to Drosophila ACF/CHRAC) that assembles regularly spaced nucleosomal arrays in an ATP-dependent manner, with Snf2h enriched in proliferating cells consistent with replication-associated chromatin assembly.\",\n      \"method\": \"cDNA cloning, differential expression analysis, biochemical fractionation\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — expression and complex membership inferred; functional evidence from related Drosophila work\",\n      \"pmids\": [\"11359880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SNF2H (SMARCA5) is the catalytic ATPase subunit of the nucleolar remodeling complex NoRC (with TIP5), which interacts with TTF-I and induces ATP- and histone H4 tail-dependent nucleosome sliding at the rDNA locus.\",\n      \"method\": \"Co-immunoprecipitation, recombinant complex reconstitution, nucleosome sliding assay, colocalization with UBF in nucleolus\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — biochemical reconstitution of complex, in vitro nucleosome sliding assay, subcellular colocalization, multiple orthogonal methods\",\n      \"pmids\": [\"11532953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SMARCA5/SNF2H forms the WICH complex with WSTF (Williams Syndrome Transcription Factor), and both localize to replicating pericentric heterochromatin; mouse WSTF interacts specifically with the SNF2H isoform of ISWI.\",\n      \"method\": \"Purification from Xenopus egg extract, co-immunoprecipitation in mouse cells, immunofluorescence colocalization at heterochromatin replication foci\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, biochemical purification to homogeneity, direct localization at replication foci with functional context\",\n      \"pmids\": [\"11980720\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"An ACF1-SNF2H (SMARCA5) complex is specifically required for DNA replication through pericentromeric heterochromatin; RNAi depletion of ACF1 impairs late-S-phase replication of heterochromatin, and SNF2H depletion slows replication progression throughout S phase.\",\n      \"method\": \"RNAi depletion, BrdU incorporation/immunofluorescence, cell-cycle analysis, expression of ACF1 mutant unable to interact with SNF2H\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean RNAi knockdowns of both subunits, specific phenotypic readout, dominant-negative rescue, multiple orthogonal methods in mammalian cells\",\n      \"pmids\": [\"12434153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Snf2h (SMARCA5) is required for early mouse development; Snf2h-null embryos die at the periimplantation stage with growth arrest and death of both trophectoderm and inner cell mass; reduction of Snf2h in human CD34+ hematopoietic progenitors inhibits cytokine-induced erythropoiesis.\",\n      \"method\": \"Gene targeting (null mutation in mice), blastocyst outgrowth assay, antisense inhibition in human hematopoietic progenitors, in vitro differentiation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with defined developmental phenotype, replicated in two biological systems (mouse embryo and human progenitors)\",\n      \"pmids\": [\"14617767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SMARCA5/SNF2H is recruited to DNA replication foci through direct interaction of its partner WSTF with PCNA; depletion of WSTF or SNF2H causes compaction of newly replicated chromatin and increases heterochromatin markers including HP1β.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, immunofluorescence at replication foci, RNAi knockdown, chromatin fractionation\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction demonstrated, RNAi knockdown with specific chromatin phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"15543136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SMARCA5/SNF2H (hSNF2H) physically interacts with DNMT3B, HDAC1, HDAC2, HP1 proteins, and Suv39h1 in heterochromatic regions; endogenous hSNF2H is associated with DNA methyltransferase activity.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, immunofluorescence colocalization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP/pulldown per interaction, single lab\",\n      \"pmids\": [\"15120635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SNF2H (SMARCA5) and BRG1 (SWI/SNF ATPase) both stimulate V(D)J cleavage of nucleosomal substrates by RAG proteins in an ATP-dependent manner, with SNF2H acting through nucleosome remodeling to increase DNA accessibility.\",\n      \"method\": \"In vitro V(D)J cleavage assay on polynucleosomal arrays, recombinant SNF2H remodeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro reconstitution assay with defined substrate, single lab\",\n      \"pmids\": [\"15201272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SNF2H (SMARCA5) is a major mammalian ISWI ATPase; loss of SNF2H decreases nucleosomal phasing and increases linker lengths in vivo, and is required for CTCF binding and chromosomal insulation of topologically associated domains.\",\n      \"method\": \"Genetic knockout of SNF2H in mouse embryonic stem cells, MNase-seq, ChIP-seq for transcription factor binding, Hi-C for chromosomal folding\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple genome-wide readouts, multiple orthogonal methods, highly cited\",\n      \"pmids\": [\"30996347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SMARCA5 is part of the RSF (remodeling and spacing factor) complex with RSF-1; knockdown of SMARCA5 in breast cancer cells decreases cell proliferation and invasion, arrests the cell cycle, downregulates cyclin A and MMP2, and upregulates p21.\",\n      \"method\": \"siRNA knockdown, colony formation assay, Matrigel invasion assay, flow cytometry, western blot\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — loss-of-function with defined cellular phenotype but no in-depth pathway placement, single lab\",\n      \"pmids\": [\"25377162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SMARCA5/SNF2H is recruited to DNA double-strand breaks in a PARP1-dependent manner; SMARCA5 interacts with RNF168 (which becomes poly(ADP-ribosyl)ated) in a DNA damage- and PARP-dependent manner, and promotes RNF168 accumulation at DSBs, thereby facilitating ubiquitin conjugation and BRCA1 assembly; SMARCA5 depletion renders cells sensitive to ionizing radiation and causes DSB repair defects.\",\n      \"method\": \"Live cell imaging, co-immunoprecipitation, RNAi depletion, immunofluorescence, clonogenic survival, comet assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, direct protein interaction shown, functional consequences of depletion established with specific repair readouts\",\n      \"pmids\": [\"23264744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SMARCA5/SNF2H and its binding partners ACF1 and WSTF are rapidly recruited to UV-C-induced DNA damage in a transcription- and histone-modification-dependent manner; recruitment requires the SWI2/SNF2-ATPase and SLIDE domains of SMARCA5; SMARCA5 facilitates CSB binding to lesion-stalled RNA Pol II and promotes transcription recovery; after initial recruitment, SMARCA5 relocalizes away from DNA damage center in a HAND-domain-dependent manner.\",\n      \"method\": \"Live cell imaging (laser micro-irradiation), domain deletion mutants, siRNA knockdown, transcription recovery assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain mapping with functional validation, live imaging, multiple orthogonal approaches, mechanistic detail on domain requirements\",\n      \"pmids\": [\"24990377\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ACF1-SNF2H (SMARCA5) ISWI complex is required for Artemis-dependent DSB repair in heterochromatin; ACF1-SNF2H requires RNF20 for binding to heterochromatic DSBs and functions downstream of pKAP-1-mediated CHD3.1 dispersal to relax compacted chromatin; CHD3.1 and ACF1-SNF2H display counteractive chromatin remodeling activities.\",\n      \"method\": \"siRNA knockdown, live-cell imaging, comet assay, epistasis analysis, chromatin compaction assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis between CHD3.1 and ACF1-SNF2H, pathway placement in DSB repair, multiple orthogonal methods\",\n      \"pmids\": [\"25533843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NuMA interacts with SMARCA5/SNF2H via co-immunoprecipitation, regulates SNF2H diffusion in the nucleoplasm, and controls its accumulation at DNA double-strand breaks; cells with silenced NuMA show reduced chromatin decompaction after DNA cleavage and impaired homologous recombination repair.\",\n      \"method\": \"Co-immunoprecipitation, FRAP, siRNA knockdown, DR-GFP reporter assay, laser micro-irradiation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction and FRAP, KD with defined repair phenotype, single lab\",\n      \"pmids\": [\"24753406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SMARCA5 (Smarca5) supports CTCF binding to target sites on chromatin, facilitates CTCF's enhancer-blocking function at the ICR, and is recruited with CTCF and the Cohesin complex to the SPI1 gene enhancer during myeloid differentiation, where it helps control PU.1 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, siRNA knockdown, AZA-mediated demethylation experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — ChIP and co-IP in physiological context, single lab, functional follow-up of CTCF–SMARCA5 interaction\",\n      \"pmids\": [\"24498324\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conditional deletion of Smarca5 at the onset of definitive hematopoiesis causes late fetal anemia; hematopoietic stem and progenitor cells accumulate but cannot mature; loss of Smarca5 leads to increased p53 levels phosphorylated at S15 (DNA damage) and acetylated at K376 (CBP/p300), activation of p53 targets, and G2/M block in basophilic erythroblasts.\",\n      \"method\": \"Conditional gene knockout (Vav1-iCre and Epor-iCre), flow cytometry, western blot, 4-OHT-mediated ex vivo deletion\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two independent conditional KO models with defined molecular and cellular phenotypes, multiple readouts\",\n      \"pmids\": [\"28276606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss of SNF2H (SMARCA5) in mouse embryonic stem cells decreases nucleosomal phasing and increases linker lengths; SNF2H loss selectively impairs binding of CTCF but not REST, revealing that different transcription factors rely on distinct remodeling pathways, and that SNF2H is required for topological insulation at TAD boundaries.\",\n      \"method\": \"Genetic knockout, MNase-seq, ATAC-seq, ChIP-seq, Hi-C\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO with multiple genome-wide orthogonal assays, replicated findings\",\n      \"pmids\": [\"30996347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Smarca5 interacts with nucleolin to promote chromatin accessibility at promoters of hematopoiesis-related genes in fetal HSPCs, thereby facilitating genomic binding of p300/CBP/H3K27ac to upregulate expression of bcl11ab and other hematopoietic regulators.\",\n      \"method\": \"Co-immunoprecipitation, ATAC-seq, RNA-seq, ChIP-seq, zebrafish genetic model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction (co-IP), chromatin accessibility (ATAC-seq), genome-wide binding (ChIP-seq), in vivo zebrafish model, multiple orthogonal methods\",\n      \"pmids\": [\"32756943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SMARCA5 interacts with the NUP98-NSD1 oncofusion protein within phase-separated nuclear condensates; SMARCA5 is an essential mediator of NUP98-NSD1-driven hematopoietic cell transformation, with its enzymatic activity (not condensate formation) required for maintenance of the transformed phenotype.\",\n      \"method\": \"Affinity purification–mass spectrometry, proximity ligation assay, inducible knockdown, pharmacological inhibition, methylcellulose colony assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — AP-MS interaction validated by PLA, functional role established by KD and pharmacological targeting, single lab\",\n      \"pmids\": [\"35073946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The lncRNA lncMREF interacts with Smarca5 in differentiating muscle satellite cells to promote chromatin accessibility, thereby facilitating genomic binding of p300/CBP/H3K27ac and upregulating expression of myogenic regulators including MyoD, promoting myogenic differentiation and muscle regeneration.\",\n      \"method\": \"RNA immunoprecipitation, ATAC-seq, ChIP-seq, co-immunoprecipitation, loss-of-function/gain-of-function in vitro and in vivo\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA–protein interaction shown, chromatin accessibility and histone modification changes measured by orthogonal genome-wide methods, in vivo and in vitro validation\",\n      \"pmids\": [\"36200826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SMARCA5 is continuously required to maintain nucleosome repeat length and nucleosomal phasing in human cells; acute degradation of endogenous SMARCA5 (via auxin-inducible degron) rapidly increases global nucleosome repeat length; SMARCA5 co-localizes with CTCF and H2A.Z, and its loss causes rapid loss of CTCF DNA binding and disruption of nucleosomal phasing around CTCF sites; SMARCA5 is specifically required for nucleosome spacing control at G1/S and during S phase.\",\n      \"method\": \"Auxin-inducible degron system (endogenous tagging), MNase-seq, ChIP-seq, cell-cycle synchronization in three human cell lines\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — acute degradation system with endogenous tagging, genome-wide MNase-seq, multiple cell lines, orthogonal approaches\",\n      \"pmids\": [\"36630954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"An in-frame fusion of EWSR1 (exons 1–7) to SMARCA5 (exons 14–32) was identified in an extraskeletal Ewing sarcoma/PNET with t(4;22)(q31;q12); NIH3T3 cells expressing EWSR1-hSNF2H exhibit anchorage-independent growth; deletion of the C-terminus (SLIDE/SANT motifs) impairs, and deletion of the SNF2_N domain fully abrogates, NIH3T3 cell transformation.\",\n      \"method\": \"FISH, RACE, RT-PCR, sequencing, soft-agar colony formation assay, domain deletion analysis\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — domain mapping with functional transformation readout, single lab\",\n      \"pmids\": [\"21113140\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SMARCA5 (SNF2H) is the catalytic ATPase subunit of multiple mammalian ISWI chromatin-remodeling complexes (including NoRC, WICH/WSTF-ISWI, ACF1-SNF2H/CHRAC, and RSF) that use ATP hydrolysis to slide nucleosomes and space them into regular arrays; it is continuously required to maintain nucleosomal phasing and linker DNA length genome-wide, supports CTCF and H2A.Z-associated chromatin organization, is recruited to DNA replication foci via WSTF-PCNA interaction to preserve chromatin states, is recruited to DNA double-strand breaks via PARP1/poly(ADP-ribose) to facilitate RNF168-dependent ubiquitin signaling and repair, is recruited to UV-damage-stalled transcription sites via its ATPase and SLIDE domains to enable transcription recovery, and interacts with partners including nucleolin, lncMREF, and NUP98-NSD1 to regulate hematopoietic and myogenic differentiation programs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SMARCA5 (SNF2H) is the catalytic ATPase subunit of multiple mammalian ISWI chromatin-remodeling complexes—including NoRC, WICH, ACF/CHRAC, and RSF—that hydrolyze ATP to slide and regularly space nucleosomes, thereby controlling genome-wide nucleosome repeat length, linker DNA length, and chromatin accessibility [PMID:11532953, PMID:36630954, PMID:30996347]. SMARCA5 is continuously required to maintain nucleosomal phasing and is essential for CTCF binding, enhancer insulation at TAD boundaries, and H2A.Z-associated chromatin organization; its acute depletion rapidly disrupts these features [PMID:30996347, PMID:36630954]. Beyond steady-state chromatin maintenance, SMARCA5 is recruited to DNA replication foci via WSTF–PCNA interaction to preserve chromatin states during S phase, and to DNA double-strand breaks via PARP1/poly(ADP-ribose) where it facilitates RNF168-dependent ubiquitin signaling and heterochromatic DSB repair [PMID:15543136, PMID:23264744, PMID:25533843]. SMARCA5 is essential for early embryonic development and hematopoietic differentiation, where it cooperates with nucleolin and lncRNAs such as lncMREF to open chromatin at lineage-specific gene promoters and enable p300/CBP-mediated H3K27 acetylation [PMID:14617767, PMID:28276606, PMID:32756943, PMID:36200826].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of SMARCA5 as the human ISWI homolog established that SWI2/SNF2-family ATP-dependent chromatin remodeling is conserved in mammals.\",\n      \"evidence\": \"cDNA cloning, sequence homology, FISH mapping to 4q31\",\n      \"pmids\": [\"9730600\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical activity demonstrated\", \"No complex membership defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Biochemical reconstitution revealed that SNF2H forms distinct ISWI complexes (ACF1-SNF2H and NoRC with TIP5), each capable of ATP-dependent nucleosome sliding, establishing SMARCA5 as a shared catalytic engine for multiple remodeling assemblies.\",\n      \"evidence\": \"Recombinant complex reconstitution, nucleosome sliding assays, co-IP, nucleolar colocalization\",\n      \"pmids\": [\"11532953\", \"11359880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional distinction between complexes in vivo unclear\", \"No genome-wide chromatin phenotype yet\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery of the WICH complex (WSTF–SNF2H) at replication foci and demonstration that ACF1-SNF2H is required for heterochromatin replication linked SMARCA5 to DNA replication-coupled chromatin assembly.\",\n      \"evidence\": \"Co-IP and biochemical purification from Xenopus extracts, RNAi in mammalian cells, BrdU incorporation, cell-cycle analysis\",\n      \"pmids\": [\"11980720\", \"12434153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which remodeling facilitates replication fork progression unresolved\", \"Relative contributions of WICH vs. ACF unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic knockout established that Snf2h is essential for periimplantation development and hematopoietic erythropoiesis, demonstrating that ISWI remodeling is indispensable for mammalian cell viability and lineage differentiation.\",\n      \"evidence\": \"Gene targeting in mice (null mutation), blastocyst outgrowth, antisense knockdown in human CD34+ progenitors\",\n      \"pmids\": [\"14617767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream chromatin targets in embryo not identified\", \"Molecular basis of erythroid block unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The mechanism of SMARCA5 recruitment to replication foci was resolved: WSTF directly binds PCNA, tethering SNF2H to nascent chromatin; loss of either subunit causes aberrant heterochromatin compaction, revealing WICH as a chromatin maintenance factor during replication.\",\n      \"evidence\": \"Co-IP, GST pulldown (WSTF–PCNA), RNAi, chromatin fractionation\",\n      \"pmids\": [\"15543136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether WICH remodels specific loci vs. acts globally at forks not determined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"SMARCA5 was placed in the DNA double-strand break repair pathway: PARP1-dependent recruitment of SNF2H to DSBs promotes RNF168 accumulation and ubiquitin signaling, enabling BRCA1 assembly and efficient repair.\",\n      \"evidence\": \"Live-cell imaging, co-IP, RNAi, clonogenic survival, comet assay\",\n      \"pmids\": [\"23264744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical mechanism of RNF168 activation by SNF2H not shown\", \"Relative contribution vs. other remodelers at DSBs unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Multiple studies dissected SMARCA5's roles in specialized DNA damage contexts: at UV lesions, its ATPase and SLIDE domains enable CSB binding and transcription recovery; at heterochromatic DSBs, the ACF1-SNF2H complex acts downstream of KAP-1/CHD3.1 to relax compacted chromatin for Artemis-dependent repair; and NuMA controls SNF2H nucleoplasmic dynamics and accumulation at breaks.\",\n      \"evidence\": \"Laser micro-irradiation with domain mutants, siRNA epistasis with CHD3.1/RNF20/KAP-1, FRAP, DR-GFP reporter\",\n      \"pmids\": [\"24990377\", \"25533843\", \"24753406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NuMA–SNF2H interaction is direct or bridged not resolved\", \"Structural basis of SLIDE/ATPase domain requirement at UV lesions unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Conditional hematopoietic knockout revealed that Smarca5 is required for erythroid maturation in vivo; its loss activates p53-dependent DNA damage checkpoints and G2/M arrest in erythroblasts, linking chromatin remodeling to genome integrity during rapid proliferation.\",\n      \"evidence\": \"Conditional KO (Vav1-iCre, Epor-iCre), flow cytometry, western blot\",\n      \"pmids\": [\"28276606\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether p53 activation reflects replication stress or transcriptional defects not distinguished\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Genome-wide analyses in SNF2H-knockout ESCs established that SMARCA5 is the dominant nucleosome spacing factor: its loss increases nucleosome repeat length, selectively abolishes CTCF binding (but not REST), and disrupts TAD insulation, revealing transcription-factor-specific dependence on ISWI remodeling.\",\n      \"evidence\": \"Genetic KO in mESCs, MNase-seq, ATAC-seq, ChIP-seq, Hi-C\",\n      \"pmids\": [\"30996347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which spacing enables CTCF but not REST binding unresolved\", \"Whether other ISWI ATPases compensate partially not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"SMARCA5 was shown to cooperate with nucleolin to open chromatin at hematopoietic gene promoters, enabling p300/CBP recruitment and H3K27ac deposition, providing a direct mechanism for how ISWI remodeling controls lineage-specific transcription.\",\n      \"evidence\": \"Co-IP, ATAC-seq, ChIP-seq, RNA-seq in zebrafish HSPCs\",\n      \"pmids\": [\"32756943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether nucleolin–SMARCA5 interaction is conserved in mammalian HSPCs not tested\", \"Specificity of nucleolin vs. other SMARCA5 partners at these loci unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two studies extended SMARCA5's partnership repertoire: it interacts with the NUP98-NSD1 oncofusion in phase-separated condensates and is essential for NUP98-NSD1-driven leukemic transformation; separately, the lncRNA lncMREF recruits SMARCA5 to myogenic gene promoters to open chromatin for p300/H3K27ac and drive muscle regeneration.\",\n      \"evidence\": \"AP-MS, PLA, inducible KD, pharmacological inhibition (NUP98-NSD1); RIP, ATAC-seq, ChIP-seq, in vivo muscle regeneration (lncMREF)\",\n      \"pmids\": [\"35073946\", \"36200826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether lncMREF directly guides SMARCA5 to specific genomic loci or acts indirectly not established\", \"Therapeutic window for SMARCA5 inhibition in NUP98-NSD1 leukemia unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Acute endogenous degradation of SMARCA5 proved that it is continuously required—not just during initial assembly—to maintain nucleosome repeat length and phasing throughout the cell cycle, with particular importance at G1/S and S phase for CTCF and H2A.Z site organization.\",\n      \"evidence\": \"Auxin-inducible degron at endogenous locus, MNase-seq, ChIP-seq, cell-cycle synchronization in three human cell lines\",\n      \"pmids\": [\"36630954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SMARCA5 activity is regulated during the cell cycle not defined\", \"Whether continuous requirement reflects active repositioning or counteracting disruptive forces unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: how SMARCA5 is differentially allocated among its multiple complexes in a cell-type-specific manner; the structural basis for its selectivity toward CTCF-flanking nucleosomes; and whether SMARCA5 can be therapeutically targeted in oncogenic contexts without compromising normal chromatin homeostasis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of full-length human SMARCA5 in complex with a partner subunit\", \"Mechanism of cell-cycle-dependent regulation unknown\", \"No therapeutic index established for SMARCA5 inhibition\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 4, 8, 9, 12, 17, 21]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 8, 9, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [14, 21]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 7, 19]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [9, 17, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 9, 17, 18, 20, 21]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11, 12, 13, 14]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [3, 4, 6, 21]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 16, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5, 16, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [15, 18, 20]}\n    ],\n    \"complexes\": [\n      \"NoRC (TIP5-SNF2H)\",\n      \"WICH (WSTF-SNF2H)\",\n      \"ACF/CHRAC (ACF1-SNF2H)\",\n      \"RSF (RSF1-SNF2H)\"\n    ],\n    \"partners\": [\n      \"BAZ1A\",\n      \"BAZ2A\",\n      \"BAZ1B\",\n      \"RSF1\",\n      \"RNF168\",\n      \"PCNA\",\n      \"NCL\",\n      \"NUMA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}