{"gene":"WAPL","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2017,"finding":"WAPL functions as the cohesin unloading factor that controls the length of chromatin loops genome-wide; in the absence of WAPL and its PDS5 binding partners, cohesin forms extended loops (presumably by passing CTCF sites), accumulates in axial chromosomal positions (vermicelli), and condenses chromosomes. CTCF defines TAD boundaries in a manner dependent on PDS5 proteins.","method":"Auxin-inducible degron depletion of WAPL and PDS5 proteins in human cells, combined with Hi-C, ChIP-seq, and microscopy","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional depletion with multiple orthogonal readouts (Hi-C, ChIP-seq, imaging), replicated across multiple factor depletions in one rigorous study","pmids":["29217591"],"is_preprint":false},{"year":2020,"finding":"WAPL creates a pool of free cohesin through cohesin turnover (release and reload cycle), which is required for cohesin to occupy cell-type-specific binding sites. Stabilization of cohesin binding following WAPL ablation paradoxically depletes cohesin from cell-type-specific regions, causing loss of promoter-enhancer loops and gene expression. Cohesin loading at cell-type-specific sites depends on pioneer transcription factors OCT4 and SOX2 but not NANOG.","method":"WAPL ablation in mouse embryonic stem cells combined with chromosome conformation capture (Hi-C/4C), ChIP-seq, RNA-seq, and transcription factor binding analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and genomic approaches with multiple orthogonal methods (conformation capture, ChIP-seq, RNA-seq) in a single rigorous study","pmids":["33318687"],"is_preprint":false},{"year":2022,"finding":"Acute depletion of WAPL (3 h) does not substantially affect enhancer-promoter interactions or gene expression, demonstrating that WAPL is not required for short-term maintenance of most E-P loops.","method":"Acute auxin-inducible degron depletion of WAPL in mouse embryonic stem cells, assessed by high-resolution Micro-C and nascent transcript profiling","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — acute conditional depletion with Micro-C and nascent transcription profiling; negative mechanistic finding rigorously established","pmids":["36471071"],"is_preprint":false},{"year":2016,"finding":"Wapl-Pds5 complex suppresses the intrinsic ATPase-dependent translocation ability of the cohesin core complex along DNA; cohesin acetylation (of Smc3) and mitotic kinases alleviate this suppression, allowing cohesin translocation on unreplicated DNA in Xenopus egg extracts.","method":"Single-molecule imaging of cohesin dynamics on DNA, ATPase mutant analysis, Xenopus laevis egg extract reconstitution, and Smc3 acetylation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with single-molecule imaging and mutagenesis in multiple experimental systems","pmids":["27872142"],"is_preprint":false},{"year":2012,"finding":"Budding yeast Wapl negatively regulates cohesion maintenance in G2 by destabilizing unacetylated chromosome-bound cohesin; cohesin acetylation renders cohesin Wapl-resistant from S phase onward. Wapl is not required for cohesin's role in transcriptional regulation but loss of Wapl increases chromosome condensation in both interphase and mitosis.","method":"Wapl deletion and epistasis analysis with eco1/acetyltransferase mutants in Saccharomyces cerevisiae; sister chromatid cohesion assays and chromosome condensation measurements","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis with multiple phenotypic readouts (cohesion assays, condensation), replicated in budding yeast model","pmids":["23219725"],"is_preprint":false},{"year":2016,"finding":"In C. elegans oogenesis, WAPL-1 selectively antagonizes cohesin complexes containing COH-3/4 kleisins but not REC-8-containing cohesin, demonstrating that kleisin identity determines sensitivity to WAPL-1. By restricting COH-3/4 cohesin on chromosomes, WAPL-1 controls meiotic chromosome structure throughout prophase; in the absence of REC-8, WAPL-1 inhibits COH-3/4-mediated cohesion.","method":"C. elegans genetic loss-of-function experiments, immunostaining of chromosome-associated cohesin complexes, meiotic chromosome structure analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic analysis with multiple cohesin subunit knockouts and multiple orthogonal readouts (chromosome morphology, cohesion assays)","pmids":["26841696"],"is_preprint":false},{"year":2017,"finding":"The kinase domain of Haspin binds and phosphorylates the YSR motif of Wapl, directly inhibiting the YSR motif-dependent interaction of Wapl with Pds5B, thereby protecting centromeric cohesion from Wapl-mediated release in mitosis. Phospho-mimetic mutation in Wapl-YSR prevents Wapl from binding Pds5B and releasing cohesin.","method":"Co-immunoprecipitation, in vitro kinase assays with Wapl YSR mutants, Haspin inhibitor treatment, forced centromere targeting of Haspin kinase domain, and centromeric cohesion assays in cells","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay plus mutagenesis plus cellular epistasis, multiple orthogonal methods in one study","pmids":["29138236"],"is_preprint":false},{"year":2020,"finding":"WAPL promotes RAD51-dependent repair and restart of broken DNA replication forks under replication stress conditions; active cohesin removal by WAPL is required for cell growth under replication stress. WAPL depletion causes oncogene-induced loss of sister chromatid cohesion from newly synthesized sister chromatids.","method":"WAPL depletion/knockout in untransformed and cancer cell lines, oncogene induction, replication fork repair assays, RAD51 co-localization, and metaphase spread cohesion analysis","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined cellular phenotype and RAD51 pathway placement, single lab study","pmids":["32084359"],"is_preprint":false},{"year":2012,"finding":"In Drosophila, Wapl protein antagonizes cohesin binding to chromosomes. A truncated dominant Wapl-AG mutant increases stability of cohesin binding to polytene chromosomes and causes Polycomb-group-like phenotypes (extra sex combs). Mutations in Nipped-B (cohesin loader) suppress, and pds5 mutations enhance, wapl mutant phenotypes, placing Wapl in the cohesin loading/unloading pathway and implicating stable cohesin as interfering with Polycomb-group silencing.","method":"Drosophila genetic screen, dominant wapl allele characterization, genetic epistasis with Nipped-B and pds5, polytene chromosome immunostaining for cohesin stability","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and direct cohesin localization on polytene chromosomes, single lab Drosophila study","pmids":["23034634"],"is_preprint":false},{"year":2017,"finding":"Pds5 and Wapl form a rigid scaffold that docks on Scc1 to open the Smc3-Scc1 DNA exit gate of cohesin; Wapl disrupts the Smc3-Scc1 interface with assistance from ATP hydrolysis, and Pds5 prolongs the open state by binding the dissociated N-terminal domain of Scc1, releasing DNA.","method":"Structural and biochemical model integrating published reconstitution and mutagenesis data on cohesin ring opening (review/model paper synthesizing experimental evidence)","journal":"BioEssays : news and reviews in molecular, cellular and developmental biology","confidence":"Low","confidence_rationale":"Tier 4 / Weak — mechanistic model paper synthesizing existing data without new primary experiments reported in the abstract","pmids":["28220956"],"is_preprint":false},{"year":2020,"finding":"In mouse oocytes, Wapl predominantly releases Scc1-cohesin (not Rec8-cohesin) from chromosomes. Wapl is required for accurate meiosis I chromosome segregation and production of euploid eggs. Increasing Scc1 residence time on chromosomes by Wapl depletion leads to vermicelli formation and intra-loop structures but does not increase loop size (unlike in somatic cells). Scc1 is essential for chromosome organization in oocytes.","method":"Conditional Wapl depletion in mouse oocytes, single-nucleus Hi-C, immunostaining for cohesin subunits, chromosome segregation analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional depletion with single-nucleus Hi-C and multiple orthogonal cellular phenotype readouts in mouse oocytes","pmids":["32328639"],"is_preprint":false},{"year":2023,"finding":"WAPL functions as a rheostat of cohesin processivity that determines the diversity of clustered Protocadherin (Pcdh) isoform expression in neurons. While cohesin erases genomic-distance biases in Pcdh gene choice, WAPL modulates cohesin processivity to control cell-type-specific Pcdh expression patterns and consequently axonal wiring specificity.","method":"Cell-type-specific manipulation of WAPL activity in mouse serotonergic and olfactory sensory neurons, Pcdh isoform expression profiling, axonal projection analysis","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation with defined cell-type-specific phenotypic readouts, single study","pmids":["37347873"],"is_preprint":false}],"current_model":"WAPL (Wings Apart-Like) is the principal cohesin release factor that opens the Smc3-Scc1 DNA exit gate of the cohesin ring in a Pds5-dependent manner, driving a continuous cycle of cohesin loading and unloading from chromatin; this turnover activity controls TAD boundary definition, chromatin loop length, promoter-enhancer interactions, cell-type-specific gene regulation, meiotic chromosome structure, centromeric cohesion protection (antagonized by Haspin-mediated phosphorylation of Wapl's YSR motif), DNA replication fork repair, and—in neurons—the diversity of Protocadherin isoform expression that governs neural wiring."},"narrative":{"mechanistic_narrative":"WAPL is the principal cohesin release factor that controls the residence time of the cohesin ring on chromatin, thereby setting the length of chromatin loops and the position of TAD boundaries genome-wide [PMID:29217591]. Acting together with PDS5, WAPL opens the Smc3-Scc1 exit gate of cohesin in a manner aided by ATP hydrolysis, and PDS5 prolongs the open state to release DNA [PMID:28220956]; the Wapl-Pds5 complex also suppresses the intrinsic ATPase-dependent translocation of cohesin along DNA, a suppression relieved by Smc3 acetylation and mitotic kinases [PMID:27872142]. Through continuous release-and-reload turnover, WAPL generates a pool of free cohesin required for its redistribution to cell-type-specific binding sites, so that WAPL loss paradoxically depletes cohesin from promoter-enhancer regions and disrupts cell-type-specific gene expression over the long term, even though acute WAPL loss does not perturb most enhancer-promoter loops [PMID:33318687, PMID:36471071]. WAPL antagonism of cohesin is conserved and selective for kleisin identity: it acts preferentially on Scc1/COH-3/4 cohesin rather than meiotic Rec8/REC-8 cohesin, controlling meiotic chromosome structure and accurate meiosis I segregation [PMID:26841696, PMID:32328639]. At centromeres, Haspin phosphorylates the WAPL YSR motif to block its interaction with Pds5B, protecting centromeric cohesion from premature release in mitosis [PMID:29138236]. Beyond chromosome architecture, WAPL promotes RAD51-dependent repair and restart of stressed replication forks [PMID:32084359] and acts as a rheostat of cohesin processivity that tunes clustered Protocadherin isoform diversity governing neuronal axonal wiring [PMID:37347873].","teleology":[{"year":2012,"claim":"Established WAPL as a conserved negative regulator of cohesin chromatin association, distinguishing its role in cohesion maintenance from cohesin's transcriptional functions and linking stable cohesin to chromatin silencing.","evidence":"Wapl deletion and epistasis with eco1 acetyltransferase mutants in budding yeast, plus dominant wapl allele and Nipped-B/pds5 epistasis on Drosophila polytene chromosomes","pmids":["23219725","23034634"],"confidence":"High","gaps":["Did not resolve the molecular structure of the gate-opening reaction","Mechanism by which acetylation confers Wapl-resistance not defined at this stage"]},{"year":2016,"claim":"Defined the biochemical action of Wapl-Pds5 on the cohesin core and revealed kleisin identity as the determinant of WAPL sensitivity, explaining selective regulation of distinct cohesin populations.","evidence":"Single-molecule imaging and ATPase mutant analysis in Xenopus egg extracts; C. elegans genetic loss-of-function with cohesin subunit immunostaining in oogenesis","pmids":["27872142","26841696"],"confidence":"High","gaps":["Did not provide an atomic structure of the open gate","Did not connect translocation suppression to genome-wide loop architecture"]},{"year":2017,"claim":"Connected WAPL-mediated cohesin turnover to 3D genome organization and resolved how its release activity is locally restrained at centromeres during mitosis.","evidence":"Auxin-inducible degron depletion of WAPL and PDS5 with Hi-C, ChIP-seq, and microscopy; plus Haspin in vitro kinase assays, YSR mutagenesis, and centromeric cohesion assays","pmids":["29217591","29138236"],"confidence":"High","gaps":["Long-term versus acute consequences of turnover loss not yet separated","How CTCF/PDS5 dependence integrates with WAPL release not fully mapped"]},{"year":2017,"claim":"Synthesized reconstitution data into a structural model of how Pds5-Wapl docks on Scc1 to open the Smc3-Scc1 exit gate.","evidence":"Structural/biochemical model paper integrating published reconstitution and mutagenesis data","pmids":["28220956"],"confidence":"Low","gaps":["Model paper without new primary experiments in the abstract","Step-by-step kinetics of gate opening not directly observed here"]},{"year":2020,"claim":"Demonstrated that WAPL turnover, rather than simple cohesin presence, is required for cell-type-specific cohesin positioning and gene expression, and extended WAPL function to meiosis and replication-stress survival.","evidence":"WAPL ablation in mouse ES cells with Hi-C/4C, ChIP-seq, RNA-seq; conditional Wapl depletion in mouse oocytes with single-nucleus Hi-C; WAPL knockout with replication fork repair and RAD51 co-localization assays","pmids":["33318687","32328639","32084359"],"confidence":"High","gaps":["Mechanism coupling cohesin turnover to pioneer-factor-defined sites not fully resolved","Why oocyte loop sizes do not increase unlike somatic cells unexplained","Replication-stress role rests on a single-lab Medium-confidence study"]},{"year":2022,"claim":"Showed that WAPL is dispensable for short-term maintenance of most enhancer-promoter loops, refining the timescale on which its turnover activity shapes gene regulation.","evidence":"Acute auxin-inducible degron depletion of WAPL in mouse ES cells with high-resolution Micro-C and nascent transcript profiling","pmids":["36471071"],"confidence":"High","gaps":["Does not identify which loops do depend acutely on WAPL","Distinction between maintenance and establishment timescales not mechanistically dissected"]},{"year":2023,"claim":"Established WAPL as a rheostat of cohesin processivity that tunes stochastic gene choice, linking its release activity to neuronal identity and wiring.","evidence":"Cell-type-specific manipulation of WAPL activity in mouse serotonergic and olfactory sensory neurons with Pcdh isoform profiling and axonal projection analysis","pmids":["37347873"],"confidence":"Medium","gaps":["Quantitative relationship between WAPL dose and cohesin processivity not defined","Single study without independent confirmation"]},{"year":null,"claim":"How WAPL-mediated cohesin turnover is selectively targeted, timed, and integrated across distinct biological contexts (loop extrusion, replication, meiosis, neuronal gene choice) remains incompletely resolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified kinetic model linking gate-opening biochemistry to context-specific outcomes","Regulators beyond Haspin/acetylation that locally tune WAPL activity not enumerated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,9,0]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9,3]}],"localization":[{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[0,8,10]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,6,10]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7]}],"complexes":["cohesin"],"partners":["PDS5B","PDS5A","RAD21","SMC3","HASPIN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z5K2","full_name":"Wings apart-like protein homolog","aliases":["Friend of EBNA2 protein","WAPL cohesin release factor"],"length_aa":1190,"mass_kda":132.9,"function":"Regulator of sister chromatid cohesion in mitosis which negatively regulates cohesin association with chromatin (PubMed:26299517). Involved in both sister chromatid cohesion during interphase and sister-chromatid resolution during early stages of mitosis. Couples DNA replication to sister chromatid cohesion. Cohesion ensures that chromosome partitioning is accurate in both meiotic and mitotic cells and plays an important role in DNA repair","subcellular_location":"Nucleus; Chromosome; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q7Z5K2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/WAPL","classification":"Not Classified","n_dependent_lines":312,"n_total_lines":1208,"dependency_fraction":0.2582781456953642},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000062650","cell_line_id":"CID001720","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2}],"interactors":[{"gene":"RAD21","stoichiometry":10.0},{"gene":"SMC1A","stoichiometry":10.0},{"gene":"WAPAL","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001720","total_profiled":1310},"omim":[{"mim_id":"613203","title":"DNA REPLICATION AND SISTER CHROMATID COHESION 1; DSCC1","url":"https://www.omim.org/entry/613203"},{"mim_id":"613202","title":"CHROMOSOME TRANSMISSION FIDELITY FACTOR 8; CHTF8","url":"https://www.omim.org/entry/613202"},{"mim_id":"613201","title":"CHROMOSOME TRANSMISSION FIDELITY FACTOR 18; CHTF18","url":"https://www.omim.org/entry/613201"},{"mim_id":"613200","title":"PDS5 COHESIN-ASSOCIATED FACTOR A; PDS5A","url":"https://www.omim.org/entry/613200"},{"mim_id":"610754","title":"WAPL COHESIN RELEASE FACTOR; WAPL","url":"https://www.omim.org/entry/610754"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/WAPL"},"hgnc":{"alias_symbol":["FOE"],"prev_symbol":["KIAA0261","WAPAL"]},"alphafold":{"accession":"Q7Z5K2","domains":[{"cath_id":"-","chopping":"643-808","consensus_level":"medium","plddt":84.9561,"start":643,"end":808},{"cath_id":"1.25.10.10","chopping":"820-904_913-1005","consensus_level":"medium","plddt":92.1053,"start":820,"end":1005},{"cath_id":"-","chopping":"1044-1061_1101-1190","consensus_level":"medium","plddt":89.241,"start":1044,"end":1190}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z5K2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z5K2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z5K2-F1-predicted_aligned_error_v6.png","plddt_mean":58.97},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=WAPL","jax_strain_url":"https://www.jax.org/strain/search?query=WAPL"},"sequence":{"accession":"Q7Z5K2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z5K2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z5K2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z5K2"}},"corpus_meta":[{"pmid":"15689384","id":"PMC_15689384","title":"Myeloperoxidase: friend and foe.","date":"2005","source":"Journal of leukocyte biology","url":"https://pubmed.ncbi.nlm.nih.gov/15689384","citation_count":1661,"is_preprint":false},{"pmid":"31291966","id":"PMC_31291966","title":"Neuroinflammation: friend and foe for ischemic stroke.","date":"2019","source":"Journal of neuroinflammation","url":"https://pubmed.ncbi.nlm.nih.gov/31291966","citation_count":1147,"is_preprint":false},{"pmid":"29217591","id":"PMC_29217591","title":"Topologically associating domains and chromatin loops depend on cohesin and are regulated by CTCF, WAPL, and PDS5 proteins.","date":"2017","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/29217591","citation_count":622,"is_preprint":false},{"pmid":"22425643","id":"PMC_22425643","title":"Tumor-associated neutrophils: friend or foe?","date":"2012","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/22425643","citation_count":550,"is_preprint":false},{"pmid":"32380253","id":"PMC_32380253","title":"Exercise-induced oxidative stress: Friend or foe?","date":"2020","source":"Journal of sport and health science","url":"https://pubmed.ncbi.nlm.nih.gov/32380253","citation_count":451,"is_preprint":false},{"pmid":"19793802","id":"PMC_19793802","title":"Nrf2: friend or foe for chemoprevention?","date":"2009","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/19793802","citation_count":362,"is_preprint":false},{"pmid":"30042333","id":"PMC_30042333","title":"Interleukin-1 Beta-A Friend or Foe in Malignancies?","date":"2018","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30042333","citation_count":358,"is_preprint":false},{"pmid":"16617141","id":"PMC_16617141","title":"Cardiac fibroblasts: friend or foe?","date":"2006","source":"American journal of physiology. 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CTCF defines TAD boundaries in a manner dependent on PDS5 proteins.\",\n      \"method\": \"Auxin-inducible degron depletion of WAPL and PDS5 proteins in human cells, combined with Hi-C, ChIP-seq, and microscopy\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional depletion with multiple orthogonal readouts (Hi-C, ChIP-seq, imaging), replicated across multiple factor depletions in one rigorous study\",\n      \"pmids\": [\"29217591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WAPL creates a pool of free cohesin through cohesin turnover (release and reload cycle), which is required for cohesin to occupy cell-type-specific binding sites. Stabilization of cohesin binding following WAPL ablation paradoxically depletes cohesin from cell-type-specific regions, causing loss of promoter-enhancer loops and gene expression. Cohesin loading at cell-type-specific sites depends on pioneer transcription factors OCT4 and SOX2 but not NANOG.\",\n      \"method\": \"WAPL ablation in mouse embryonic stem cells combined with chromosome conformation capture (Hi-C/4C), ChIP-seq, RNA-seq, and transcription factor binding analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and genomic approaches with multiple orthogonal methods (conformation capture, ChIP-seq, RNA-seq) in a single rigorous study\",\n      \"pmids\": [\"33318687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Acute depletion of WAPL (3 h) does not substantially affect enhancer-promoter interactions or gene expression, demonstrating that WAPL is not required for short-term maintenance of most E-P loops.\",\n      \"method\": \"Acute auxin-inducible degron depletion of WAPL in mouse embryonic stem cells, assessed by high-resolution Micro-C and nascent transcript profiling\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — acute conditional depletion with Micro-C and nascent transcription profiling; negative mechanistic finding rigorously established\",\n      \"pmids\": [\"36471071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Wapl-Pds5 complex suppresses the intrinsic ATPase-dependent translocation ability of the cohesin core complex along DNA; cohesin acetylation (of Smc3) and mitotic kinases alleviate this suppression, allowing cohesin translocation on unreplicated DNA in Xenopus egg extracts.\",\n      \"method\": \"Single-molecule imaging of cohesin dynamics on DNA, ATPase mutant analysis, Xenopus laevis egg extract reconstitution, and Smc3 acetylation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with single-molecule imaging and mutagenesis in multiple experimental systems\",\n      \"pmids\": [\"27872142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Budding yeast Wapl negatively regulates cohesion maintenance in G2 by destabilizing unacetylated chromosome-bound cohesin; cohesin acetylation renders cohesin Wapl-resistant from S phase onward. Wapl is not required for cohesin's role in transcriptional regulation but loss of Wapl increases chromosome condensation in both interphase and mitosis.\",\n      \"method\": \"Wapl deletion and epistasis analysis with eco1/acetyltransferase mutants in Saccharomyces cerevisiae; sister chromatid cohesion assays and chromosome condensation measurements\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis with multiple phenotypic readouts (cohesion assays, condensation), replicated in budding yeast model\",\n      \"pmids\": [\"23219725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In C. elegans oogenesis, WAPL-1 selectively antagonizes cohesin complexes containing COH-3/4 kleisins but not REC-8-containing cohesin, demonstrating that kleisin identity determines sensitivity to WAPL-1. By restricting COH-3/4 cohesin on chromosomes, WAPL-1 controls meiotic chromosome structure throughout prophase; in the absence of REC-8, WAPL-1 inhibits COH-3/4-mediated cohesion.\",\n      \"method\": \"C. elegans genetic loss-of-function experiments, immunostaining of chromosome-associated cohesin complexes, meiotic chromosome structure analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic analysis with multiple cohesin subunit knockouts and multiple orthogonal readouts (chromosome morphology, cohesion assays)\",\n      \"pmids\": [\"26841696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The kinase domain of Haspin binds and phosphorylates the YSR motif of Wapl, directly inhibiting the YSR motif-dependent interaction of Wapl with Pds5B, thereby protecting centromeric cohesion from Wapl-mediated release in mitosis. Phospho-mimetic mutation in Wapl-YSR prevents Wapl from binding Pds5B and releasing cohesin.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assays with Wapl YSR mutants, Haspin inhibitor treatment, forced centromere targeting of Haspin kinase domain, and centromeric cohesion assays in cells\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay plus mutagenesis plus cellular epistasis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"29138236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"WAPL promotes RAD51-dependent repair and restart of broken DNA replication forks under replication stress conditions; active cohesin removal by WAPL is required for cell growth under replication stress. WAPL depletion causes oncogene-induced loss of sister chromatid cohesion from newly synthesized sister chromatids.\",\n      \"method\": \"WAPL depletion/knockout in untransformed and cancer cell lines, oncogene induction, replication fork repair assays, RAD51 co-localization, and metaphase spread cohesion analysis\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined cellular phenotype and RAD51 pathway placement, single lab study\",\n      \"pmids\": [\"32084359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In Drosophila, Wapl protein antagonizes cohesin binding to chromosomes. A truncated dominant Wapl-AG mutant increases stability of cohesin binding to polytene chromosomes and causes Polycomb-group-like phenotypes (extra sex combs). Mutations in Nipped-B (cohesin loader) suppress, and pds5 mutations enhance, wapl mutant phenotypes, placing Wapl in the cohesin loading/unloading pathway and implicating stable cohesin as interfering with Polycomb-group silencing.\",\n      \"method\": \"Drosophila genetic screen, dominant wapl allele characterization, genetic epistasis with Nipped-B and pds5, polytene chromosome immunostaining for cohesin stability\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and direct cohesin localization on polytene chromosomes, single lab Drosophila study\",\n      \"pmids\": [\"23034634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Pds5 and Wapl form a rigid scaffold that docks on Scc1 to open the Smc3-Scc1 DNA exit gate of cohesin; Wapl disrupts the Smc3-Scc1 interface with assistance from ATP hydrolysis, and Pds5 prolongs the open state by binding the dissociated N-terminal domain of Scc1, releasing DNA.\",\n      \"method\": \"Structural and biochemical model integrating published reconstitution and mutagenesis data on cohesin ring opening (review/model paper synthesizing experimental evidence)\",\n      \"journal\": \"BioEssays : news and reviews in molecular, cellular and developmental biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — mechanistic model paper synthesizing existing data without new primary experiments reported in the abstract\",\n      \"pmids\": [\"28220956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In mouse oocytes, Wapl predominantly releases Scc1-cohesin (not Rec8-cohesin) from chromosomes. Wapl is required for accurate meiosis I chromosome segregation and production of euploid eggs. Increasing Scc1 residence time on chromosomes by Wapl depletion leads to vermicelli formation and intra-loop structures but does not increase loop size (unlike in somatic cells). Scc1 is essential for chromosome organization in oocytes.\",\n      \"method\": \"Conditional Wapl depletion in mouse oocytes, single-nucleus Hi-C, immunostaining for cohesin subunits, chromosome segregation analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional depletion with single-nucleus Hi-C and multiple orthogonal cellular phenotype readouts in mouse oocytes\",\n      \"pmids\": [\"32328639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"WAPL functions as a rheostat of cohesin processivity that determines the diversity of clustered Protocadherin (Pcdh) isoform expression in neurons. While cohesin erases genomic-distance biases in Pcdh gene choice, WAPL modulates cohesin processivity to control cell-type-specific Pcdh expression patterns and consequently axonal wiring specificity.\",\n      \"method\": \"Cell-type-specific manipulation of WAPL activity in mouse serotonergic and olfactory sensory neurons, Pcdh isoform expression profiling, axonal projection analysis\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation with defined cell-type-specific phenotypic readouts, single study\",\n      \"pmids\": [\"37347873\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"WAPL (Wings Apart-Like) is the principal cohesin release factor that opens the Smc3-Scc1 DNA exit gate of the cohesin ring in a Pds5-dependent manner, driving a continuous cycle of cohesin loading and unloading from chromatin; this turnover activity controls TAD boundary definition, chromatin loop length, promoter-enhancer interactions, cell-type-specific gene regulation, meiotic chromosome structure, centromeric cohesion protection (antagonized by Haspin-mediated phosphorylation of Wapl's YSR motif), DNA replication fork repair, and—in neurons—the diversity of Protocadherin isoform expression that governs neural wiring.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"WAPL is the principal cohesin release factor that controls the residence time of the cohesin ring on chromatin, thereby setting the length of chromatin loops and the position of TAD boundaries genome-wide [#0]. Acting together with PDS5, WAPL opens the Smc3-Scc1 exit gate of cohesin in a manner aided by ATP hydrolysis, and PDS5 prolongs the open state to release DNA [#9]; the Wapl-Pds5 complex also suppresses the intrinsic ATPase-dependent translocation of cohesin along DNA, a suppression relieved by Smc3 acetylation and mitotic kinases [#3]. Through continuous release-and-reload turnover, WAPL generates a pool of free cohesin required for its redistribution to cell-type-specific binding sites, so that WAPL loss paradoxically depletes cohesin from promoter-enhancer regions and disrupts cell-type-specific gene expression over the long term, even though acute WAPL loss does not perturb most enhancer-promoter loops [#1, #2]. WAPL antagonism of cohesin is conserved and selective for kleisin identity: it acts preferentially on Scc1/COH-3/4 cohesin rather than meiotic Rec8/REC-8 cohesin, controlling meiotic chromosome structure and accurate meiosis I segregation [#5, #10]. At centromeres, Haspin phosphorylates the WAPL YSR motif to block its interaction with Pds5B, protecting centromeric cohesion from premature release in mitosis [#6]. Beyond chromosome architecture, WAPL promotes RAD51-dependent repair and restart of stressed replication forks [#7] and acts as a rheostat of cohesin processivity that tunes clustered Protocadherin isoform diversity governing neuronal axonal wiring [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established WAPL as a conserved negative regulator of cohesin chromatin association, distinguishing its role in cohesion maintenance from cohesin's transcriptional functions and linking stable cohesin to chromatin silencing.\",\n      \"evidence\": \"Wapl deletion and epistasis with eco1 acetyltransferase mutants in budding yeast, plus dominant wapl allele and Nipped-B/pds5 epistasis on Drosophila polytene chromosomes\",\n      \"pmids\": [\"23219725\", \"23034634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular structure of the gate-opening reaction\", \"Mechanism by which acetylation confers Wapl-resistance not defined at this stage\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined the biochemical action of Wapl-Pds5 on the cohesin core and revealed kleisin identity as the determinant of WAPL sensitivity, explaining selective regulation of distinct cohesin populations.\",\n      \"evidence\": \"Single-molecule imaging and ATPase mutant analysis in Xenopus egg extracts; C. elegans genetic loss-of-function with cohesin subunit immunostaining in oogenesis\",\n      \"pmids\": [\"27872142\", \"26841696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not provide an atomic structure of the open gate\", \"Did not connect translocation suppression to genome-wide loop architecture\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Connected WAPL-mediated cohesin turnover to 3D genome organization and resolved how its release activity is locally restrained at centromeres during mitosis.\",\n      \"evidence\": \"Auxin-inducible degron depletion of WAPL and PDS5 with Hi-C, ChIP-seq, and microscopy; plus Haspin in vitro kinase assays, YSR mutagenesis, and centromeric cohesion assays\",\n      \"pmids\": [\"29217591\", \"29138236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term versus acute consequences of turnover loss not yet separated\", \"How CTCF/PDS5 dependence integrates with WAPL release not fully mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Synthesized reconstitution data into a structural model of how Pds5-Wapl docks on Scc1 to open the Smc3-Scc1 exit gate.\",\n      \"evidence\": \"Structural/biochemical model paper integrating published reconstitution and mutagenesis data\",\n      \"pmids\": [\"28220956\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Model paper without new primary experiments in the abstract\", \"Step-by-step kinetics of gate opening not directly observed here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that WAPL turnover, rather than simple cohesin presence, is required for cell-type-specific cohesin positioning and gene expression, and extended WAPL function to meiosis and replication-stress survival.\",\n      \"evidence\": \"WAPL ablation in mouse ES cells with Hi-C/4C, ChIP-seq, RNA-seq; conditional Wapl depletion in mouse oocytes with single-nucleus Hi-C; WAPL knockout with replication fork repair and RAD51 co-localization assays\",\n      \"pmids\": [\"33318687\", \"32328639\", \"32084359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling cohesin turnover to pioneer-factor-defined sites not fully resolved\", \"Why oocyte loop sizes do not increase unlike somatic cells unexplained\", \"Replication-stress role rests on a single-lab Medium-confidence study\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed that WAPL is dispensable for short-term maintenance of most enhancer-promoter loops, refining the timescale on which its turnover activity shapes gene regulation.\",\n      \"evidence\": \"Acute auxin-inducible degron depletion of WAPL in mouse ES cells with high-resolution Micro-C and nascent transcript profiling\",\n      \"pmids\": [\"36471071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify which loops do depend acutely on WAPL\", \"Distinction between maintenance and establishment timescales not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established WAPL as a rheostat of cohesin processivity that tunes stochastic gene choice, linking its release activity to neuronal identity and wiring.\",\n      \"evidence\": \"Cell-type-specific manipulation of WAPL activity in mouse serotonergic and olfactory sensory neurons with Pcdh isoform profiling and axonal projection analysis\",\n      \"pmids\": [\"37347873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative relationship between WAPL dose and cohesin processivity not defined\", \"Single study without independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How WAPL-mediated cohesin turnover is selectively targeted, timed, and integrated across distinct biological contexts (loop extrusion, replication, meiosis, neuronal gene choice) remains incompletely resolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified kinetic model linking gate-opening biochemistry to context-specific outcomes\", \"Regulators beyond Haspin/acetylation that locally tune WAPL activity not enumerated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 9, 0]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [0, 8, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 6, 10]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"complexes\": [\"cohesin\"],\n    \"partners\": [\"PDS5B\", \"PDS5A\", \"RAD21\", \"SMC3\", \"HASPIN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}