{"gene":"SMARCA1","run_date":"2026-06-10T07:46:35","timeline":{"discoveries":[{"year":2004,"finding":"A naturally occurring human SNF2L splice variant (SNF2L+13) contains a non-conserved in-frame exon within the conserved catalytic core domain. This isoform retains the ability to incorporate into multiprotein complexes but is devoid of enzymatic (ATPase/chromatin remodeling) activity. Importantly, the inactive SNF2L+13 isoform is predominant in non-neuronal tissues, while the active wild-type SNF2L isoform is expressed in neurons, indicating tissue-specific regulation of SNF2L activity through alternative splicing.","method":"Identification of splice variant by molecular cloning; complex incorporation assays; enzymatic activity assays; tissue expression analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical activity assays plus complex incorporation, single lab, multiple orthogonal methods","pmids":["15310751"],"is_preprint":false},{"year":2001,"finding":"Murine Snf2l (SMARCA1 ortholog) shows a distinct expression pattern from Snf2h during development: Snf2h is prevalent in proliferating cell populations whereas Snf2l is predominantly expressed in terminally differentiated neurons after birth and in adult animals, including expression of a neural-specific isoform, suggesting distinct functional roles associated with cell maturation or differentiation versus replication-associated functions.","method":"Cloning of murine cDNAs; spatial and temporal expression profiling during development by in situ hybridization and Northern blot","journal":"Journal of neurochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — expression profiling only, no direct functional assay linking localization to mechanism, single lab","pmids":["11359880"],"is_preprint":false},{"year":2012,"finding":"Snf2l (SMARCA1) regulates brain size by repressing Foxg1 expression. Snf2l mutant mice exhibit forebrain hypercellularity due to increased Foxg1 expression, increased progenitor cell expansion, and delayed differentiation. Snf2l binds directly to the Foxg1 locus at mid-neurogenesis, and reducing Foxg1 dosage rescues the hypercellularity phenotype, establishing a genetic epistasis between Snf2l and Foxg1 in which they function antagonistically to regulate brain size.","method":"Snf2l mutant mouse model; chromatin immunoprecipitation (ChIP) at Foxg1 locus; genetic rescue by Foxg1 heterozygosity; cell proliferation and differentiation assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with rescue experiment, ChIP localization to target locus, loss-of-function mouse model with defined cellular phenotype, single lab but multiple orthogonal methods","pmids":["22516202"],"is_preprint":false},{"year":2012,"finding":"SNF2L (SMARCA1) depletion in HeLa cells leads to enhanced cell proliferation and increased migration. Transcriptome profiling revealed that SNF2L depletion activates the Wnt signaling network. SNF2L expression is high in normal melanocytes but undetectable in malignant melanoma, supporting an inverse relationship between SNF2L expression and malignant cell features.","method":"RNA interference (siRNA) knockdown; cell proliferation and migration assays; transcriptome profiling; immunohistochemistry in normal vs. malignant tissue","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus transcriptome profiling, single lab, two orthogonal methods","pmids":["22508985"],"is_preprint":false},{"year":2009,"finding":"SNF2L (SMARCA1) knockdown via siRNA selectively causes DNA damage, DNA damage response (phosphorylation of ATR, BRCA1, CHK1, CHK2, H2AX, p53), G2/M arrest, and apoptosis in cancer cell lines but not in normal cell lines, despite similar levels of SNF2L expression. DNA damage preceded apoptosis. This selective sensitivity was not observed when the related SNF2H (SMARCA5) was inhibited, establishing a cancer-specific functional requirement for SNF2L.","method":"siRNA knockdown; cell viability assays; Western blot for checkpoint proteins; flow cytometry for cell cycle analysis; comparison of cancer vs. normal cell lines","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined mechanistic phenotype (DNA damage response pathway), comparison with SNF2H control, single lab, multiple assays","pmids":["19996304"],"is_preprint":false},{"year":2016,"finding":"The chromatin remodeling enzyme SNF2L (SMARCA1/ISWI family) positions nucleosomes adjacent to CTCF binding sites and other transcription factor binding sites genome-wide. SNF2H plays a major role at CTCF sites and promotes CTCF binding, while SNF2L also contributes to nucleosome organization at many factor binding sites. Depletion of SNF2H affects transcription of a common set of genes with CTCF depletion.","method":"Chromatin remodeler depletion; genome-wide nucleosome mapping (MNase-seq); ChIP-seq for transcription factor occupancy; transcriptome analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide functional mapping with depletion, multiple orthogonal methods, but SNF2L contribution is secondary to SNF2H in this study","pmids":["27019336"],"is_preprint":false},{"year":2008,"finding":"In porcine preimplantation embryos, overexpression of SMARCA2 (but not SMARCA4) mRNA via injection altered SMARCA1 (SNF2L) transcript abundance. Specifically, SMARCA1 transcript levels were altered following injection of wild-type SMARCA2, and wild-type and dominant-negative SMARCA4, suggesting SMARCA1 expression is regulated downstream of or in coordination with other SWI/SNF ATPases during early embryogenesis.","method":"mRNA injection into porcine embryos; RT-PCR quantification of transcript levels; embryo development assays","journal":"Reproduction (Cambridge, England)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (transcript level change after mRNA injection), indirect evidence for regulation of SMARCA1, single lab","pmids":["18845624"],"is_preprint":false}],"current_model":"SMARCA1 (SNF2L) is an ISWI-family ISWI ATPase that catalyzes nucleosome remodeling in multiprotein complexes and is regulated at the tissue level through alternative splicing (generating an inactive SNF2L+13 isoform in non-neuronal cells and an active isoform restricted to neurons); in the developing brain, SNF2L binds the Foxg1 locus and represses Foxg1 expression to antagonize progenitor cell expansion, and in human cells SNF2L loss activates Wnt signaling to promote cell proliferation and migration."},"narrative":{"mechanistic_narrative":"SMARCA1 (SNF2L) is an ISWI-family ATP-dependent chromatin remodeling enzyme that organizes nucleosome positioning to control gene expression programs governing neural development and cell proliferation [PMID:22516202, PMID:27019336]. Its catalytic activity is regulated tissue-specifically through alternative splicing: a naturally occurring SNF2L+13 variant carries an in-frame exon within the catalytic core that abolishes ATPase/remodeling activity while preserving complex incorporation, and this inactive isoform predominates in non-neuronal tissues whereas the active enzyme is expressed in neurons [PMID:15310751]. In the developing brain, SNF2L binds directly to the Foxg1 locus at mid-neurogenesis and represses Foxg1 expression; loss of Snf2l causes forebrain hypercellularity through increased progenitor expansion and delayed differentiation, a phenotype rescued by reducing Foxg1 dosage, establishing an antagonistic genetic relationship that sets brain size [PMID:22516202]. Genome-wide, SNF2L positions nucleosomes adjacent to CTCF and other transcription factor binding sites, contributing to chromatin organization at regulatory elements [PMID:27019336]. In human cells, SNF2L depletion enhances proliferation and migration coincident with activation of Wnt signaling, and SNF2L is expressed in normal melanocytes but undetectable in malignant melanoma [PMID:22508985]; depletion selectively triggers DNA damage, checkpoint activation, G2/M arrest, and apoptosis in cancer but not normal cell lines, a requirement not shared by the related SNF2H/SMARCA5 [PMID:19996304].","teleology":[{"year":2001,"claim":"Established that the SMARCA1 ortholog has an expression profile distinct from its paralog Snf2h, raising the question of a specialized, differentiation-associated rather than replication-associated role.","evidence":"cDNA cloning and developmental expression profiling by in situ hybridization and Northern blot in mouse","pmids":["11359880"],"confidence":"Low","gaps":["Expression profiling only, no direct functional assay","Does not link the neural-specific isoform to a mechanism","Does not establish a molecular target or pathway"]},{"year":2004,"claim":"Resolved how SNF2L activity is regulated across tissues by identifying a splice variant that uncouples complex assembly from catalysis.","evidence":"Molecular cloning of the SNF2L+13 variant with complex incorporation and enzymatic activity assays plus tissue expression analysis","pmids":["15310751"],"confidence":"Medium","gaps":["Functional consequence of the inactive isoform in vivo not defined","Splicing regulators controlling the +13 exon not identified","Which complexes incorporate each isoform not resolved"]},{"year":2008,"claim":"Indicated that SMARCA1 transcript abundance is coordinated with other SWI/SNF ATPases during early embryogenesis.","evidence":"mRNA injection of SMARCA2/SMARCA4 into porcine embryos with RT-PCR quantification of SMARCA1 transcripts","pmids":["18845624"],"confidence":"Low","gaps":["Indirect, single-method transcript readout","No mechanism linking SMARCA2/4 to SMARCA1 regulation","No protein-level or functional confirmation"]},{"year":2009,"claim":"Revealed a cancer-selective dependency on SNF2L by showing its depletion triggers DNA damage and checkpoint-driven death in cancer but not normal cells, distinguishing it from its paralog.","evidence":"siRNA knockdown with viability assays, checkpoint protein Western blots, and cell-cycle flow cytometry comparing cancer vs normal lines, with SNF2H as control","pmids":["19996304"],"confidence":"Medium","gaps":["Molecular basis of the DNA damage induction unknown","Why cancer cells are selectively sensitive despite equal expression is unexplained","Single lab, not independently confirmed"]},{"year":2012,"claim":"Defined SNF2L's developmental function by identifying Foxg1 as a directly bound target it represses to constrain progenitor expansion and brain size.","evidence":"Snf2l mutant mouse, ChIP at the Foxg1 locus, genetic rescue by Foxg1 heterozygosity, and proliferation/differentiation assays","pmids":["22516202"],"confidence":"High","gaps":["Whether repression requires remodeling at the Foxg1 locus not shown","Complex composition acting at Foxg1 not defined","Direct nucleosome-level mechanism at the locus not resolved"]},{"year":2012,"claim":"Connected SNF2L loss to a proliferative, migratory phenotype via Wnt pathway activation and linked its silencing to malignancy.","evidence":"siRNA knockdown in HeLa with proliferation/migration assays, transcriptome profiling, and immunohistochemistry in normal vs malignant melanoma tissue","pmids":["22508985"],"confidence":"Medium","gaps":["Direct chromatin targets within the Wnt network not identified","Causality between Wnt activation and the phenotype not dissected","Mechanism of SNF2L silencing in melanoma unknown"]},{"year":2016,"claim":"Placed SNF2L within genome-wide chromatin organization by showing it positions nucleosomes at CTCF and other transcription factor binding sites.","evidence":"Remodeler depletion with MNase-seq nucleosome mapping, transcription factor ChIP-seq, and transcriptome analysis","pmids":["27019336"],"confidence":"Medium","gaps":["SNF2L contribution is secondary to SNF2H in this assay","Direct vs indirect effects on factor binding not separated","Site-specific recruitment determinants for SNF2L unknown"]},{"year":null,"claim":"How SNF2L is recruited to specific loci and which remodeling complexes deploy the active versus inactive isoform to drive its developmental and tumor-suppressive functions remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Complex partners directing locus specificity not mapped","Unifying mechanism linking Foxg1 repression, Wnt restraint, and genome stability not established","Splicing control of the active isoform not connected to its in vivo roles"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,5]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,5]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,5]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P28370","full_name":"SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A member 1","aliases":["Global transcription activator SNF2L1","Nucleosome-remodeling factor subunit SNF2L","SNF2L","SNF2 related chromatin remodeling ATPase 1"],"length_aa":1042,"mass_kda":121.1,"function":"ATPase that possesses intrinsic ATP-dependent chromatin-remodeling activity (PubMed:14609955, PubMed:15310751, PubMed:15640247, PubMed:28801535). ATPase activity is substrate-dependent, and is increased when nucleosomes are the substrate, but is also catalytically active when DNA alone is the substrate (PubMed:14609955, PubMed:15310751, PubMed:15640247). 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 (PubMed:14609955, PubMed:15310751, PubMed:15640247, 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-, BAZ1B-, BAZ2A- 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 (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). Within the NURF-1 and CERF-1 ISWI chromatin remodeling complexes, nucleosomes are the preferred substrate for its ATPase activity (PubMed:14609955, PubMed:15640247). Within the NURF-1 ISWI chromatin-remodeling complex, binds to the promoters of En1 and En2 to positively regulate their expression and promote brain development (PubMed:14609955). May promote neurite outgrowth (PubMed:14609955). May be involved in the development of luteal cells (PubMed:16740656). Facilitates nucleosome assembly during DNA replication, ensuring replication fork progression and genomic stability by preventing replication stress and nascent DNA gaps (PubMed:39413208) Catalytically inactive when either DNA or nucleosomes are the substrate and does not possess chromatin-remodeling activity (PubMed:15310751, PubMed:28801535). Acts as a negative regulator of chromatin remodelers by generating inactive complexes (PubMed:15310751)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/P28370/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SMARCA1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000102038","cell_line_id":"CID001670","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2},{"compartment":"cytoplasmic","grade":1}],"interactors":[{"gene":"CHRAC1","stoichiometry":10.0},{"gene":"CECR2","stoichiometry":10.0},{"gene":"NUCKS1","stoichiometry":4.0},{"gene":"BAP18;C17ORF49;RNASEK-C17ORF49","stoichiometry":4.0},{"gene":"HMGXB4","stoichiometry":4.0},{"gene":"POLE3","stoichiometry":4.0},{"gene":"BAZ1A","stoichiometry":4.0},{"gene":"BAZ1B","stoichiometry":4.0},{"gene":"RSF1","stoichiometry":4.0},{"gene":"BPTF","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001670","total_profiled":1310},"omim":[{"mim_id":"613325","title":"RHABDOID TUMOR PREDISPOSITION SYNDROME 2; RTPS2","url":"https://www.omim.org/entry/613325"},{"mim_id":"607576","title":"CECR2 HISTONE ACETYL-LYSINE READER; CECR2","url":"https://www.omim.org/entry/607576"},{"mim_id":"603946","title":"HELICASE, LYMPHOID-SPECIFIC; HELLS","url":"https://www.omim.org/entry/603946"},{"mim_id":"602810","title":"HISTONE GENE CLUSTER 1, H3 HISTONE FAMILY, MEMBER A; HIST1H3A","url":"https://www.omim.org/entry/602810"},{"mim_id":"601819","title":"BROMODOMAIN PHD FINGER TRANSCRIPTION FACTOR; BPTF","url":"https://www.omim.org/entry/601819"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SMARCA1"},"hgnc":{"alias_symbol":["SNF2LB","NURF140","ISWI","SWI","hSNF2L"],"prev_symbol":["SNF2L1","SNF2L"]},"alphafold":{"accession":"P28370","domains":[{"cath_id":"3.40.50.10810","chopping":"184-398","consensus_level":"high","plddt":83.2167,"start":184,"end":398},{"cath_id":"3.40.50.300","chopping":"409-738","consensus_level":"high","plddt":77.9614,"start":409,"end":738},{"cath_id":"1.10.1040.30","chopping":"787-918","consensus_level":"medium","plddt":87.5536,"start":787,"end":918},{"cath_id":"1.10.10.60","chopping":"926-1038","consensus_level":"high","plddt":87.6412,"start":926,"end":1038}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P28370","model_url":"https://alphafold.ebi.ac.uk/files/AF-P28370-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P28370-F1-predicted_aligned_error_v6.png","plddt_mean":74.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SMARCA1","jax_strain_url":"https://www.jax.org/strain/search?query=SMARCA1"},"sequence":{"accession":"P28370","fasta_url":"https://rest.uniprot.org/uniprotkb/P28370.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P28370/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P28370"}},"corpus_meta":[{"pmid":"30343899","id":"PMC_30343899","title":"Modular Organization and Assembly of SWI/SNF Family Chromatin Remodeling Complexes.","date":"2018","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/30343899","citation_count":592,"is_preprint":false},{"pmid":"19234488","id":"PMC_19234488","title":"The SWI/SNF complex and cancer.","date":"2009","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/19234488","citation_count":473,"is_preprint":false},{"pmid":"26552009","id":"PMC_26552009","title":"SWI/SNF-mutant cancers depend on catalytic and non-catalytic activity of EZH2.","date":"2015","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26552009","citation_count":339,"is_preprint":false},{"pmid":"18448678","id":"PMC_18448678","title":"ES cell pluripotency and germ-layer formation require the SWI/SNF chromatin remodeling component BAF250a.","date":"2008","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/18448678","citation_count":276,"is_preprint":false},{"pmid":"30401838","id":"PMC_30401838","title":"The SWI/SNF complex is a mechanoregulated inhibitor of YAP and TAZ.","date":"2018","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/30401838","citation_count":264,"is_preprint":false},{"pmid":"34937944","id":"PMC_34937944","title":"Targeting SWI/SNF ATPases in enhancer-addicted prostate cancer.","date":"2021","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/34937944","citation_count":252,"is_preprint":false},{"pmid":"25387058","id":"PMC_25387058","title":"SWI/SNF chromatin remodeling and human malignancies.","date":"2014","source":"Annual review of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25387058","citation_count":251,"is_preprint":false},{"pmid":"29892061","id":"PMC_29892061","title":"Mutations in the SWI/SNF complex induce a targetable dependence on oxidative phosphorylation in lung cancer.","date":"2018","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29892061","citation_count":219,"is_preprint":false},{"pmid":"16518397","id":"PMC_16518397","title":"Chromatin remodeling by ISW2 and SWI/SNF requires DNA translocation inside the nucleosome.","date":"2006","source":"Nature structural & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/16518397","citation_count":213,"is_preprint":false},{"pmid":"30996347","id":"PMC_30996347","title":"Mammalian ISWI and SWI/SNF selectively mediate binding of distinct transcription factors.","date":"2019","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/30996347","citation_count":209,"is_preprint":false},{"pmid":"32958894","id":"PMC_32958894","title":"COMPASS and SWI/SNF complexes in development and disease.","date":"2020","source":"Nature reviews. 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This isoform retains the ability to incorporate into multiprotein complexes but is devoid of enzymatic (ATPase/chromatin remodeling) activity. Importantly, the inactive SNF2L+13 isoform is predominant in non-neuronal tissues, while the active wild-type SNF2L isoform is expressed in neurons, indicating tissue-specific regulation of SNF2L activity through alternative splicing.\",\n      \"method\": \"Identification of splice variant by molecular cloning; complex incorporation assays; enzymatic activity assays; tissue expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical activity assays plus complex incorporation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15310751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Murine Snf2l (SMARCA1 ortholog) shows a distinct expression pattern from Snf2h during development: Snf2h is prevalent in proliferating cell populations whereas Snf2l is predominantly expressed in terminally differentiated neurons after birth and in adult animals, including expression of a neural-specific isoform, suggesting distinct functional roles associated with cell maturation or differentiation versus replication-associated functions.\",\n      \"method\": \"Cloning of murine cDNAs; spatial and temporal expression profiling during development by in situ hybridization and Northern blot\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — expression profiling only, no direct functional assay linking localization to mechanism, single lab\",\n      \"pmids\": [\"11359880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Snf2l (SMARCA1) regulates brain size by repressing Foxg1 expression. Snf2l mutant mice exhibit forebrain hypercellularity due to increased Foxg1 expression, increased progenitor cell expansion, and delayed differentiation. Snf2l binds directly to the Foxg1 locus at mid-neurogenesis, and reducing Foxg1 dosage rescues the hypercellularity phenotype, establishing a genetic epistasis between Snf2l and Foxg1 in which they function antagonistically to regulate brain size.\",\n      \"method\": \"Snf2l mutant mouse model; chromatin immunoprecipitation (ChIP) at Foxg1 locus; genetic rescue by Foxg1 heterozygosity; cell proliferation and differentiation assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with rescue experiment, ChIP localization to target locus, loss-of-function mouse model with defined cellular phenotype, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"22516202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SNF2L (SMARCA1) depletion in HeLa cells leads to enhanced cell proliferation and increased migration. Transcriptome profiling revealed that SNF2L depletion activates the Wnt signaling network. SNF2L expression is high in normal melanocytes but undetectable in malignant melanoma, supporting an inverse relationship between SNF2L expression and malignant cell features.\",\n      \"method\": \"RNA interference (siRNA) knockdown; cell proliferation and migration assays; transcriptome profiling; immunohistochemistry in normal vs. malignant tissue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype plus transcriptome profiling, single lab, two orthogonal methods\",\n      \"pmids\": [\"22508985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SNF2L (SMARCA1) knockdown via siRNA selectively causes DNA damage, DNA damage response (phosphorylation of ATR, BRCA1, CHK1, CHK2, H2AX, p53), G2/M arrest, and apoptosis in cancer cell lines but not in normal cell lines, despite similar levels of SNF2L expression. DNA damage preceded apoptosis. This selective sensitivity was not observed when the related SNF2H (SMARCA5) was inhibited, establishing a cancer-specific functional requirement for SNF2L.\",\n      \"method\": \"siRNA knockdown; cell viability assays; Western blot for checkpoint proteins; flow cytometry for cell cycle analysis; comparison of cancer vs. normal cell lines\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined mechanistic phenotype (DNA damage response pathway), comparison with SNF2H control, single lab, multiple assays\",\n      \"pmids\": [\"19996304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The chromatin remodeling enzyme SNF2L (SMARCA1/ISWI family) positions nucleosomes adjacent to CTCF binding sites and other transcription factor binding sites genome-wide. SNF2H plays a major role at CTCF sites and promotes CTCF binding, while SNF2L also contributes to nucleosome organization at many factor binding sites. Depletion of SNF2H affects transcription of a common set of genes with CTCF depletion.\",\n      \"method\": \"Chromatin remodeler depletion; genome-wide nucleosome mapping (MNase-seq); ChIP-seq for transcription factor occupancy; transcriptome analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide functional mapping with depletion, multiple orthogonal methods, but SNF2L contribution is secondary to SNF2H in this study\",\n      \"pmids\": [\"27019336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In porcine preimplantation embryos, overexpression of SMARCA2 (but not SMARCA4) mRNA via injection altered SMARCA1 (SNF2L) transcript abundance. Specifically, SMARCA1 transcript levels were altered following injection of wild-type SMARCA2, and wild-type and dominant-negative SMARCA4, suggesting SMARCA1 expression is regulated downstream of or in coordination with other SWI/SNF ATPases during early embryogenesis.\",\n      \"method\": \"mRNA injection into porcine embryos; RT-PCR quantification of transcript levels; embryo development assays\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (transcript level change after mRNA injection), indirect evidence for regulation of SMARCA1, single lab\",\n      \"pmids\": [\"18845624\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SMARCA1 (SNF2L) is an ISWI-family ISWI ATPase that catalyzes nucleosome remodeling in multiprotein complexes and is regulated at the tissue level through alternative splicing (generating an inactive SNF2L+13 isoform in non-neuronal cells and an active isoform restricted to neurons); in the developing brain, SNF2L binds the Foxg1 locus and represses Foxg1 expression to antagonize progenitor cell expansion, and in human cells SNF2L loss activates Wnt signaling to promote cell proliferation and migration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SMARCA1 (SNF2L) is an ISWI-family ATP-dependent chromatin remodeling enzyme that organizes nucleosome positioning to control gene expression programs governing neural development and cell proliferation [#2, #5]. Its catalytic activity is regulated tissue-specifically through alternative splicing: a naturally occurring SNF2L+13 variant carries an in-frame exon within the catalytic core that abolishes ATPase/remodeling activity while preserving complex incorporation, and this inactive isoform predominates in non-neuronal tissues whereas the active enzyme is expressed in neurons [#0]. In the developing brain, SNF2L binds directly to the Foxg1 locus at mid-neurogenesis and represses Foxg1 expression; loss of Snf2l causes forebrain hypercellularity through increased progenitor expansion and delayed differentiation, a phenotype rescued by reducing Foxg1 dosage, establishing an antagonistic genetic relationship that sets brain size [#2]. Genome-wide, SNF2L positions nucleosomes adjacent to CTCF and other transcription factor binding sites, contributing to chromatin organization at regulatory elements [#5]. In human cells, SNF2L depletion enhances proliferation and migration coincident with activation of Wnt signaling, and SNF2L is expressed in normal melanocytes but undetectable in malignant melanoma [#3]; depletion selectively triggers DNA damage, checkpoint activation, G2/M arrest, and apoptosis in cancer but not normal cell lines, a requirement not shared by the related SNF2H/SMARCA5 [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that the SMARCA1 ortholog has an expression profile distinct from its paralog Snf2h, raising the question of a specialized, differentiation-associated rather than replication-associated role.\",\n      \"evidence\": \"cDNA cloning and developmental expression profiling by in situ hybridization and Northern blot in mouse\",\n      \"pmids\": [\"11359880\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Expression profiling only, no direct functional assay\", \"Does not link the neural-specific isoform to a mechanism\", \"Does not establish a molecular target or pathway\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how SNF2L activity is regulated across tissues by identifying a splice variant that uncouples complex assembly from catalysis.\",\n      \"evidence\": \"Molecular cloning of the SNF2L+13 variant with complex incorporation and enzymatic activity assays plus tissue expression analysis\",\n      \"pmids\": [\"15310751\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the inactive isoform in vivo not defined\", \"Splicing regulators controlling the +13 exon not identified\", \"Which complexes incorporate each isoform not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Indicated that SMARCA1 transcript abundance is coordinated with other SWI/SNF ATPases during early embryogenesis.\",\n      \"evidence\": \"mRNA injection of SMARCA2/SMARCA4 into porcine embryos with RT-PCR quantification of SMARCA1 transcripts\",\n      \"pmids\": [\"18845624\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Indirect, single-method transcript readout\", \"No mechanism linking SMARCA2/4 to SMARCA1 regulation\", \"No protein-level or functional confirmation\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a cancer-selective dependency on SNF2L by showing its depletion triggers DNA damage and checkpoint-driven death in cancer but not normal cells, distinguishing it from its paralog.\",\n      \"evidence\": \"siRNA knockdown with viability assays, checkpoint protein Western blots, and cell-cycle flow cytometry comparing cancer vs normal lines, with SNF2H as control\",\n      \"pmids\": [\"19996304\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the DNA damage induction unknown\", \"Why cancer cells are selectively sensitive despite equal expression is unexplained\", \"Single lab, not independently confirmed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined SNF2L's developmental function by identifying Foxg1 as a directly bound target it represses to constrain progenitor expansion and brain size.\",\n      \"evidence\": \"Snf2l mutant mouse, ChIP at the Foxg1 locus, genetic rescue by Foxg1 heterozygosity, and proliferation/differentiation assays\",\n      \"pmids\": [\"22516202\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether repression requires remodeling at the Foxg1 locus not shown\", \"Complex composition acting at Foxg1 not defined\", \"Direct nucleosome-level mechanism at the locus not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected SNF2L loss to a proliferative, migratory phenotype via Wnt pathway activation and linked its silencing to malignancy.\",\n      \"evidence\": \"siRNA knockdown in HeLa with proliferation/migration assays, transcriptome profiling, and immunohistochemistry in normal vs malignant melanoma tissue\",\n      \"pmids\": [\"22508985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct chromatin targets within the Wnt network not identified\", \"Causality between Wnt activation and the phenotype not dissected\", \"Mechanism of SNF2L silencing in melanoma unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed SNF2L within genome-wide chromatin organization by showing it positions nucleosomes at CTCF and other transcription factor binding sites.\",\n      \"evidence\": \"Remodeler depletion with MNase-seq nucleosome mapping, transcription factor ChIP-seq, and transcriptome analysis\",\n      \"pmids\": [\"27019336\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SNF2L contribution is secondary to SNF2H in this assay\", \"Direct vs indirect effects on factor binding not separated\", \"Site-specific recruitment determinants for SNF2L unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SNF2L is recruited to specific loci and which remodeling complexes deploy the active versus inactive isoform to drive its developmental and tumor-suppressive functions remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Complex partners directing locus specificity not mapped\", \"Unifying mechanism linking Foxg1 repression, Wnt restraint, and genome stability not established\", \"Splicing control of the active isoform not connected to its in vivo roles\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}