{"gene":"CWC22","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2012,"finding":"CWC22 is an essential splicing factor required for EJC assembly; its MIF4G domain directly interacts with the EJC core protein eIF4A3 to initiate EJC assembly. Mutations in eIF4A3 that abolish CWC22 binding prevent splicing-dependent EJC deposition but not splicing-independent recombinant EJC core assembly.","method":"Co-immunoprecipitation, in vitro binding assays, mutagenesis of eIF4A3 interface residues, RNAi depletion with rescue experiments, in vitro splicing assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding demonstrated biochemically, interface mutagenesis performed, functional rescue assays, replicated across two independent labs same year","pmids":["22959432"],"is_preprint":false},{"year":2012,"finding":"Human CWC22 directly contacts eIF4A3 and prevents it from binding RNA in the free state, then escorts eIF4A3 to spliceosomes before spliceosome remodeling, facilitating eIF4A3 incorporation into the EJC on mature mRNA.","method":"Recombinant protein binding assays, in vitro splicing assays, co-immunoprecipitation, knockdown in vivo (Drosophila and human cells)","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — recombinant direct binding, in vitro splicing, in vivo knockdown; independent replication in same year by multiple labs","pmids":["22961380"],"is_preprint":false},{"year":2012,"finding":"Human CWC22 directly interacts with eIF4A3 in vitro and in vivo; interface mutations (hCWC22 G168Y) disrupt association and exacerbate the defect in splicing-dependent eIF4A3 deposition without inhibiting splicing itself, establishing a specific role for CWC22 in EJC deposition distinct from its splicing role. CWC22 depletion causes a splicing defect and impairs NMD through failure to deposit EJCs.","method":"In vitro binding assays, in vivo co-immunoprecipitation, site-directed mutagenesis at predicted interface, in vitro splicing/deposition assays, in vivo RNAi depletion with mRNA level analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of interface, orthogonal in vitro and in vivo assays, functional separation of splicing and EJC deposition activities","pmids":["23236153"],"is_preprint":false},{"year":2013,"finding":"Crystal structure (2.0 Å) of human eIF4AIII bound to the MIF4G domain of CWC22 reveals that CWC22 MIF4G binds both RecA domains of eIF4AIII in an inhibitory mode: the RNA-binding and ATP-binding motifs of the two RecA domains are positioned in diametrically opposite orientations (incompatible with the active state), mechanistically explaining how CWC22 prevents eIF4AIII from nonspecifically binding RNA prior to spliceosomal delivery.","method":"X-ray crystallography at 2.0 Å resolution","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure with mechanistic interpretation; consistent with multiple biochemical studies from independent labs","pmids":["24218557"],"is_preprint":false},{"year":2010,"finding":"Yeast Cwc22 is required for pre-mRNA splicing in vivo and in vitro but is not a stable NTC component and is not required for spliceosome activation. Cwc22 associates with the spliceosome prior to catalytic steps and remains throughout the reaction; its stable association requires NTC but is independent of Prp2. Cwc22 is essential for Prp2 function in promoting release of U2 components SF3a and SF3b: in the absence of Cwc22, Prp2 binds but is released upon ATP hydrolysis without displacing SF3a/b.","method":"In vivo splicing assays, in vitro splicing assays, spliceosome pull-down/fractionation, ATPase/functional assays with Prp2","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal in vivo and in vitro assays, mechanistic dissection of Prp2 function dependency","pmids":["20956557"],"is_preprint":false},{"year":2015,"finding":"The core of CWC22 is sufficient to mediate both pre-mRNA splicing and EJC assembly, but these two functions can be functionally uncoupled using an eIF4A3-binding-deficient CWC22 mutant. A C-terminal domain of CWC22 enhances its spliceosomal interaction. CWC22 depletion causes global pre-mRNA splicing defects across hundreds of genes as shown by high-throughput RNA-seq.","method":"Domain deletion analysis, eIF4A3-binding-deficient mutants, RNAi depletion, high-throughput RNA-seq, in vivo splicing and EJC assembly assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (mutagenesis, RNA-seq, depletion rescue), single lab but comprehensive functional dissection","pmids":["25870412"],"is_preprint":false},{"year":2020,"finding":"CWC22 forms a stable heterodimer with the splicing factor CWC27; the crystal structure (3 Å) of the eIF4A3/CWC22/CWC27 ternary complex reveals that CWC27 and CWC22 together form a landing platform for eIF4A3 on the Bact spliceosome complex. The structure is compatible with Bact but not C complex (a CWC27 loop would clash with EJC subunit Y14), suggesting CWC27/CWC22 facilitate eIF4A3 recruitment before its conversion to C complex. Knockdown of either CWC27 or CWC22 affects the same gene sets in retinal cells.","method":"Co-immunoprecipitation (CWC27 pulldown identifying CWC22 as major partner), X-ray crystallography at 3 Å, structural modeling against published spliceosome structures, siRNA knockdown with RNA-seq","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — crystal structure plus reciprocal co-IP plus functional knockdown; single lab but multiple orthogonal methods","pmids":["32329775"],"is_preprint":false},{"year":2017,"finding":"CWC22 protein is aberrantly upregulated in diabetic dorsal root ganglia and impairs neuronal function; knockdown of CWC22 in vitro enhances sensory neuron neurite outgrowth, and axonal siRNA delivery to knock down CWC22 in diabetic nerves in vivo improves aspects of sensory function.","method":"Immunohistochemistry/protein quantification in DRG, in vitro siRNA knockdown with neurite outgrowth assay, in vivo axonal siRNA delivery with sensory behavioral testing","journal":"Disease models & mechanisms","confidence":"Medium","confidence_rationale":"Tier 2–3 / Weak — loss-of-function with defined cellular and in vivo phenotype, single lab, limited mechanistic depth at molecular level","pmids":["28250049"],"is_preprint":false},{"year":2023,"finding":"Spinal CWC22 is upregulated after inflammatory pain induction; knockdown of spinal CWC22 reverses thermal hyperalgesia and mechanical allodynia, while CWC22 overexpression induces pain in naïve mice. CWC22 mediates alternative splicing of Spp1, and specifically the Spp1 splicing variant 4 (Spp1 V4) is required for CWC22-dependent nociceptive regulation.","method":"Lentivirus-mediated knockdown and overexpression in spinal dorsal horn, behavioral pain tests, transcriptome/genome analysis (RNA-seq), molecular biological assays for splicing","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss- and gain-of-function in vivo with defined behavioral phenotype and splice variant identification, single lab","pmids":["37838283"],"is_preprint":false},{"year":2026,"finding":"Knockdown of CWC22 in cancer cells causes mitotic slippage (premature mitotic exit) by downregulating SAC-regulatory genes including BubR1 and leading to accumulation of inactive CDK1 (phosphorylated at Tyr15) and cyclin B1 degradation in mitosis. Simultaneous cyclin B1 overexpression and Wee1 blockade, or BubR1 overexpression, mitigates the shortened mitotic duration caused by CWC22 knockdown, establishing CWC22 as required for spindle assembly checkpoint function via maintenance of BubR1 expression and CDK1 activity.","method":"siRNA knockdown, cell cycle analysis (flow cytometry), live-cell imaging, RNA-seq, cyclin B1 overexpression, Wee1 inhibitor treatment, BubR1 overexpression rescue","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal rescue experiments (BubR1 OE, Wee1 blockade, cyclin B1 OE), RNA-seq, single lab","pmids":["41534835"],"is_preprint":false},{"year":2017,"finding":"Mdmd, the housefly male-determining M-factor, originated from a duplication of the spliceosomal factor gene CWC22 (nucampholin/Cwc22). Targeted disruption of Mdmd results in complete sex reversal to fertile females via a shift from male to female splicing of transformer and doublesex, demonstrating that CWC22 paralogs can acquire neofunctionalized roles in sex determination through gene duplication.","method":"Genetic identification, targeted gene disruption (CRISPR/RNAi), sex-reversal phenotype analysis, downstream gene expression assays","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — targeted disruption with complete sex reversal phenotype and downstream gene analysis; relevant as evolutionary/functional context for CWC22 as splicing regulator","pmids":["28495751"],"is_preprint":false}],"current_model":"CWC22 is a spliceosomal protein that serves a dual function: it is required for pre-mRNA splicing (acting at the Prp2-dependent step to promote SF3a/b release in yeast) and it couples splicing to exon junction complex (EJC) assembly by directly binding the DEAD-box helicase eIF4A3 through its MIF4G domain—an interaction structurally characterized at 2.0 Å that holds eIF4A3 in an inhibitory, RNA-binding-incompetent conformation until CWC22 escorts it to the spliceosome, where EJC deposition is triggered; CWC22 also forms a heterodimer with CWC27 that together serve as an eIF4A3 landing platform on the Bact spliceosome, and loss of CWC22 globally impairs splicing, disrupts EJC deposition, attenuates nonsense-mediated decay, and in mitotic cells leads to spindle assembly checkpoint failure through downregulation of BubR1 and CDK1 inactivation."},"narrative":{"mechanistic_narrative":"CWC22 is a conserved spliceosomal protein that couples pre-mRNA splicing to assembly of the exon junction complex (EJC) [PMID:22959432, PMID:22961380]. Its MIF4G domain binds the DEAD-box helicase eIF4A3 directly, and a 2.0 Å crystal structure shows that this interaction clamps the two RecA domains of eIF4A3 in diametrically opposite orientations incompatible with the active state, holding the helicase in an RNA-binding-incompetent conformation until CWC22 escorts it to the spliceosome where EJC deposition is triggered [PMID:22961380, PMID:24218557]. These two activities are separable: an eIF4A3-binding-deficient CWC22 retains splicing function but fails to deposit EJCs, while the protein core suffices for both and a C-terminal domain enhances spliceosomal interaction [PMID:23236153, PMID:25870412]. On the activated (Bact) spliceosome CWC22 forms a stable heterodimer with CWC27 that together constitute a landing platform for eIF4A3, structurally compatible with Bact but not C complex, positioning eIF4A3 for recruitment prior to catalytic remodeling [PMID:32329775]. In yeast, Cwc22 is required for the Prp2-dependent splicing step, enabling Prp2 to displace the U2 components SF3a and SF3b upon ATP hydrolysis [PMID:20956557]. Loss of CWC22 globally impairs splicing, disrupts EJC deposition, and attenuates nonsense-mediated decay [PMID:23236153, PMID:25870412], and in mitotic cancer cells causes spindle assembly checkpoint failure through downregulation of BubR1 and accumulation of inactive Tyr15-phosphorylated CDK1, leading to mitotic slippage [PMID:41534835]. CWC22 has also been implicated in nociceptive signaling, where it is upregulated in diabetic and inflammatory pain states and regulates Spp1 splicing [PMID:28250049, PMID:37838283].","teleology":[{"year":2010,"claim":"Established Cwc22 as a splicing factor with a specific mechanistic role, answering where in the splicing cycle it acts: it is required for the Prp2-dependent step that releases SF3a/SF3b.","evidence":"In vivo and in vitro splicing assays with spliceosome fractionation and Prp2 functional assays in yeast","pmids":["20956557"],"confidence":"High","gaps":["Did not link Cwc22 to EJC assembly","Molecular basis of how Cwc22 enables Prp2-dependent SF3a/b release not resolved"]},{"year":2012,"claim":"Resolved how splicing is coupled to EJC assembly by showing CWC22 directly binds eIF4A3 via its MIF4G domain and escorts the helicase to the spliceosome while blocking its premature RNA binding.","evidence":"Co-IP, recombinant in vitro binding, interface mutagenesis, in vitro splicing/deposition assays, and RNAi rescue in Drosophila and human cells across independent labs","pmids":["22959432","22961380","23236153"],"confidence":"High","gaps":["Structural basis of the inhibitory binding mode not yet defined","Did not separate splicing from EJC-deposition activities cleanly until mutant analysis"]},{"year":2013,"claim":"Provided the structural mechanism for eIF4A3 inhibition, explaining how CWC22 prevents nonspecific RNA binding by locking both RecA domains in an inactive orientation.","evidence":"X-ray crystallography at 2.0 Å of the eIF4AIII–CWC22 MIF4G complex","pmids":["24218557"],"confidence":"High","gaps":["Does not capture the conformational transition that activates eIF4A3 on the spliceosome","No structure of CWC22 within the assembled spliceosome"]},{"year":2015,"claim":"Demonstrated that CWC22's splicing and EJC-assembly functions are genetically separable, defining the minimal core and a spliceosome-enhancing C-terminal region.","evidence":"Domain deletion, eIF4A3-binding-deficient mutants, RNAi depletion, and high-throughput RNA-seq in human cells","pmids":["25870412"],"confidence":"High","gaps":["Mechanism by which the C-terminal domain enhances spliceosome interaction undefined","Spliceosomal contacts beyond eIF4A3 not mapped"]},{"year":2020,"claim":"Identified CWC27 as a stable CWC22 partner and showed the two form a structural landing platform that recruits eIF4A3 at the Bact stage before C-complex conversion.","evidence":"Reciprocal co-IP, 3 Å crystal structure of the eIF4A3/CWC22/CWC27 ternary complex, modeling against spliceosome structures, and siRNA RNA-seq in retinal cells","pmids":["32329775"],"confidence":"High","gaps":["Dynamics of platform disassembly during Bact-to-C transition not observed","Whether CWC27 contributes catalytically or only structurally unresolved"]},{"year":2017,"claim":"Extended CWC22 beyond core splicing biology into disease physiology, showing its upregulation impairs sensory neuron function in diabetic nerves.","evidence":"Protein quantification in DRG, in vitro siRNA neurite outgrowth assay, and in vivo axonal siRNA delivery with sensory behavioral testing","pmids":["28250049"],"confidence":"Medium","gaps":["Molecular splicing targets driving the neuronal phenotype not identified","Link to canonical EJC/splicing function not established"]},{"year":2017,"claim":"Showed evolutionary plasticity of CWC22 by demonstrating that a CWC22 duplicate became the housefly male-determining factor controlling sex-specific splicing.","evidence":"Genetic identification, targeted disruption with sex-reversal phenotype, and downstream transformer/doublesex splicing analysis","pmids":["28495751"],"confidence":"Medium","gaps":["Mechanism distinguishing the neofunctionalized paralog from ancestral CWC22 not detailed","Relevance to mammalian CWC22 function indirect"]},{"year":2023,"claim":"Connected CWC22-dependent alternative splicing to a physiological output, identifying Spp1 variant 4 as a required mediator of CWC22-driven nociception.","evidence":"Lentiviral knockdown/overexpression in spinal dorsal horn, behavioral pain tests, RNA-seq, and splicing assays","pmids":["37838283"],"confidence":"Medium","gaps":["How CWC22 selects the Spp1 V4 splice choice mechanistically unclear","Single-lab, single-pathway readout"]},{"year":2026,"claim":"Revealed a mitotic role for CWC22, showing it is required for spindle assembly checkpoint function by sustaining BubR1 expression and CDK1 activity.","evidence":"siRNA knockdown with flow cytometry, live-cell imaging, RNA-seq, and rescue by BubR1 overexpression, cyclin B1 overexpression, and Wee1 inhibition in cancer cells","pmids":["41534835"],"confidence":"Medium","gaps":["Whether BubR1/CDK1 effects are direct splicing consequences not established","Generalizability beyond the cancer cell models tested unknown"]},{"year":null,"claim":"How CWC22's global splicing/EJC activity is selectively channeled into distinct tissue-specific outcomes (sensory neuron function, nociception, mitotic checkpoint) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified mechanism linking core EJC function to the divergent disease phenotypes","Direct splicing targets underlying each phenotype largely unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,3,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,3]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,4,6]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,4,5]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[9]}],"complexes":["spliceosome","exon junction complex","CWC22–CWC27 heterodimer"],"partners":["EIF4A3","CWC27"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9HCG8","full_name":"Pre-mRNA-splicing factor CWC22 homolog","aliases":["Nucampholin homolog","fSAPb"],"length_aa":908,"mass_kda":105.5,"function":"Required for pre-mRNA splicing as component of the spliceosome (PubMed:11991638, PubMed:12226669, PubMed:22961380, PubMed:28076346, PubMed:28502770, PubMed:29301961, PubMed:29360106). As a component of the minor spliceosome, involved in the splicing of U12-type introns in pre-mRNAs (Probable). Promotes exon-junction complex (EJC) assembly (PubMed:22959432, PubMed:22961380). Hinders EIF4A3 from non-specifically binding RNA and escorts it to the splicing machinery to promote EJC assembly on mature mRNAs. Through its role in EJC assembly, required for nonsense-mediated mRNA decay","subcellular_location":"Nucleus; Nucleus speckle","url":"https://www.uniprot.org/uniprotkb/Q9HCG8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CWC22","classification":"Common Essential","n_dependent_lines":1205,"n_total_lines":1208,"dependency_fraction":0.9975165562913907},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CPSF6","stoichiometry":0.2},{"gene":"SNRPA","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CWC22","total_profiled":1310},"omim":[{"mim_id":"615186","title":"CWC22, SPLICEOSOME-ASSOCIATED PROTEIN; CWC22","url":"https://www.omim.org/entry/615186"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nuclear speckles","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CWC22"},"hgnc":{"alias_symbol":["KIAA1604","EIF4GL","fSAPb","NCM"],"prev_symbol":[]},"alphafold":{"accession":"Q9HCG8","domains":[{"cath_id":"1.25.40.180","chopping":"146-389","consensus_level":"high","plddt":91.1697,"start":146,"end":389},{"cath_id":"1.25.40.180","chopping":"455-654","consensus_level":"medium","plddt":87.6981,"start":455,"end":654}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCG8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCG8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCG8-F1-predicted_aligned_error_v6.png","plddt_mean":65.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CWC22","jax_strain_url":"https://www.jax.org/strain/search?query=CWC22"},"sequence":{"accession":"Q9HCG8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HCG8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HCG8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCG8"}},"corpus_meta":[{"pmid":"28495751","id":"PMC_28495751","title":"Male 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Mutations in eIF4A3 that abolish CWC22 binding prevent splicing-dependent EJC deposition but not splicing-independent recombinant EJC core assembly.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, mutagenesis of eIF4A3 interface residues, RNAi depletion with rescue experiments, in vitro splicing assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding demonstrated biochemically, interface mutagenesis performed, functional rescue assays, replicated across two independent labs same year\",\n      \"pmids\": [\"22959432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human CWC22 directly contacts eIF4A3 and prevents it from binding RNA in the free state, then escorts eIF4A3 to spliceosomes before spliceosome remodeling, facilitating eIF4A3 incorporation into the EJC on mature mRNA.\",\n      \"method\": \"Recombinant protein binding assays, in vitro splicing assays, co-immunoprecipitation, knockdown in vivo (Drosophila and human cells)\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — recombinant direct binding, in vitro splicing, in vivo knockdown; independent replication in same year by multiple labs\",\n      \"pmids\": [\"22961380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Human CWC22 directly interacts with eIF4A3 in vitro and in vivo; interface mutations (hCWC22 G168Y) disrupt association and exacerbate the defect in splicing-dependent eIF4A3 deposition without inhibiting splicing itself, establishing a specific role for CWC22 in EJC deposition distinct from its splicing role. CWC22 depletion causes a splicing defect and impairs NMD through failure to deposit EJCs.\",\n      \"method\": \"In vitro binding assays, in vivo co-immunoprecipitation, site-directed mutagenesis at predicted interface, in vitro splicing/deposition assays, in vivo RNAi depletion with mRNA level analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of interface, orthogonal in vitro and in vivo assays, functional separation of splicing and EJC deposition activities\",\n      \"pmids\": [\"23236153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure (2.0 Å) of human eIF4AIII bound to the MIF4G domain of CWC22 reveals that CWC22 MIF4G binds both RecA domains of eIF4AIII in an inhibitory mode: the RNA-binding and ATP-binding motifs of the two RecA domains are positioned in diametrically opposite orientations (incompatible with the active state), mechanistically explaining how CWC22 prevents eIF4AIII from nonspecifically binding RNA prior to spliceosomal delivery.\",\n      \"method\": \"X-ray crystallography at 2.0 Å resolution\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure with mechanistic interpretation; consistent with multiple biochemical studies from independent labs\",\n      \"pmids\": [\"24218557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Yeast Cwc22 is required for pre-mRNA splicing in vivo and in vitro but is not a stable NTC component and is not required for spliceosome activation. Cwc22 associates with the spliceosome prior to catalytic steps and remains throughout the reaction; its stable association requires NTC but is independent of Prp2. Cwc22 is essential for Prp2 function in promoting release of U2 components SF3a and SF3b: in the absence of Cwc22, Prp2 binds but is released upon ATP hydrolysis without displacing SF3a/b.\",\n      \"method\": \"In vivo splicing assays, in vitro splicing assays, spliceosome pull-down/fractionation, ATPase/functional assays with Prp2\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal in vivo and in vitro assays, mechanistic dissection of Prp2 function dependency\",\n      \"pmids\": [\"20956557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The core of CWC22 is sufficient to mediate both pre-mRNA splicing and EJC assembly, but these two functions can be functionally uncoupled using an eIF4A3-binding-deficient CWC22 mutant. A C-terminal domain of CWC22 enhances its spliceosomal interaction. CWC22 depletion causes global pre-mRNA splicing defects across hundreds of genes as shown by high-throughput RNA-seq.\",\n      \"method\": \"Domain deletion analysis, eIF4A3-binding-deficient mutants, RNAi depletion, high-throughput RNA-seq, in vivo splicing and EJC assembly assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (mutagenesis, RNA-seq, depletion rescue), single lab but comprehensive functional dissection\",\n      \"pmids\": [\"25870412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CWC22 forms a stable heterodimer with the splicing factor CWC27; the crystal structure (3 Å) of the eIF4A3/CWC22/CWC27 ternary complex reveals that CWC27 and CWC22 together form a landing platform for eIF4A3 on the Bact spliceosome complex. The structure is compatible with Bact but not C complex (a CWC27 loop would clash with EJC subunit Y14), suggesting CWC27/CWC22 facilitate eIF4A3 recruitment before its conversion to C complex. Knockdown of either CWC27 or CWC22 affects the same gene sets in retinal cells.\",\n      \"method\": \"Co-immunoprecipitation (CWC27 pulldown identifying CWC22 as major partner), X-ray crystallography at 3 Å, structural modeling against published spliceosome structures, siRNA knockdown with RNA-seq\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — crystal structure plus reciprocal co-IP plus functional knockdown; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"32329775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CWC22 protein is aberrantly upregulated in diabetic dorsal root ganglia and impairs neuronal function; knockdown of CWC22 in vitro enhances sensory neuron neurite outgrowth, and axonal siRNA delivery to knock down CWC22 in diabetic nerves in vivo improves aspects of sensory function.\",\n      \"method\": \"Immunohistochemistry/protein quantification in DRG, in vitro siRNA knockdown with neurite outgrowth assay, in vivo axonal siRNA delivery with sensory behavioral testing\",\n      \"journal\": \"Disease models & mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — loss-of-function with defined cellular and in vivo phenotype, single lab, limited mechanistic depth at molecular level\",\n      \"pmids\": [\"28250049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Spinal CWC22 is upregulated after inflammatory pain induction; knockdown of spinal CWC22 reverses thermal hyperalgesia and mechanical allodynia, while CWC22 overexpression induces pain in naïve mice. CWC22 mediates alternative splicing of Spp1, and specifically the Spp1 splicing variant 4 (Spp1 V4) is required for CWC22-dependent nociceptive regulation.\",\n      \"method\": \"Lentivirus-mediated knockdown and overexpression in spinal dorsal horn, behavioral pain tests, transcriptome/genome analysis (RNA-seq), molecular biological assays for splicing\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss- and gain-of-function in vivo with defined behavioral phenotype and splice variant identification, single lab\",\n      \"pmids\": [\"37838283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Knockdown of CWC22 in cancer cells causes mitotic slippage (premature mitotic exit) by downregulating SAC-regulatory genes including BubR1 and leading to accumulation of inactive CDK1 (phosphorylated at Tyr15) and cyclin B1 degradation in mitosis. Simultaneous cyclin B1 overexpression and Wee1 blockade, or BubR1 overexpression, mitigates the shortened mitotic duration caused by CWC22 knockdown, establishing CWC22 as required for spindle assembly checkpoint function via maintenance of BubR1 expression and CDK1 activity.\",\n      \"method\": \"siRNA knockdown, cell cycle analysis (flow cytometry), live-cell imaging, RNA-seq, cyclin B1 overexpression, Wee1 inhibitor treatment, BubR1 overexpression rescue\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal rescue experiments (BubR1 OE, Wee1 blockade, cyclin B1 OE), RNA-seq, single lab\",\n      \"pmids\": [\"41534835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mdmd, the housefly male-determining M-factor, originated from a duplication of the spliceosomal factor gene CWC22 (nucampholin/Cwc22). Targeted disruption of Mdmd results in complete sex reversal to fertile females via a shift from male to female splicing of transformer and doublesex, demonstrating that CWC22 paralogs can acquire neofunctionalized roles in sex determination through gene duplication.\",\n      \"method\": \"Genetic identification, targeted gene disruption (CRISPR/RNAi), sex-reversal phenotype analysis, downstream gene expression assays\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — targeted disruption with complete sex reversal phenotype and downstream gene analysis; relevant as evolutionary/functional context for CWC22 as splicing regulator\",\n      \"pmids\": [\"28495751\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CWC22 is a spliceosomal protein that serves a dual function: it is required for pre-mRNA splicing (acting at the Prp2-dependent step to promote SF3a/b release in yeast) and it couples splicing to exon junction complex (EJC) assembly by directly binding the DEAD-box helicase eIF4A3 through its MIF4G domain—an interaction structurally characterized at 2.0 Å that holds eIF4A3 in an inhibitory, RNA-binding-incompetent conformation until CWC22 escorts it to the spliceosome, where EJC deposition is triggered; CWC22 also forms a heterodimer with CWC27 that together serve as an eIF4A3 landing platform on the Bact spliceosome, and loss of CWC22 globally impairs splicing, disrupts EJC deposition, attenuates nonsense-mediated decay, and in mitotic cells leads to spindle assembly checkpoint failure through downregulation of BubR1 and CDK1 inactivation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CWC22 is a conserved spliceosomal protein that couples pre-mRNA splicing to assembly of the exon junction complex (EJC) [#0, #1]. Its MIF4G domain binds the DEAD-box helicase eIF4A3 directly, and a 2.0 Å crystal structure shows that this interaction clamps the two RecA domains of eIF4A3 in diametrically opposite orientations incompatible with the active state, holding the helicase in an RNA-binding-incompetent conformation until CWC22 escorts it to the spliceosome where EJC deposition is triggered [#1, #3]. These two activities are separable: an eIF4A3-binding-deficient CWC22 retains splicing function but fails to deposit EJCs, while the protein core suffices for both and a C-terminal domain enhances spliceosomal interaction [#2, #5]. On the activated (Bact) spliceosome CWC22 forms a stable heterodimer with CWC27 that together constitute a landing platform for eIF4A3, structurally compatible with Bact but not C complex, positioning eIF4A3 for recruitment prior to catalytic remodeling [#6]. In yeast, Cwc22 is required for the Prp2-dependent splicing step, enabling Prp2 to displace the U2 components SF3a and SF3b upon ATP hydrolysis [#4]. Loss of CWC22 globally impairs splicing, disrupts EJC deposition, and attenuates nonsense-mediated decay [#2, #5], and in mitotic cancer cells causes spindle assembly checkpoint failure through downregulation of BubR1 and accumulation of inactive Tyr15-phosphorylated CDK1, leading to mitotic slippage [#9]. CWC22 has also been implicated in nociceptive signaling, where it is upregulated in diabetic and inflammatory pain states and regulates Spp1 splicing [#7, #8].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Established Cwc22 as a splicing factor with a specific mechanistic role, answering where in the splicing cycle it acts: it is required for the Prp2-dependent step that releases SF3a/SF3b.\",\n      \"evidence\": \"In vivo and in vitro splicing assays with spliceosome fractionation and Prp2 functional assays in yeast\",\n      \"pmids\": [\"20956557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not link Cwc22 to EJC assembly\", \"Molecular basis of how Cwc22 enables Prp2-dependent SF3a/b release not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved how splicing is coupled to EJC assembly by showing CWC22 directly binds eIF4A3 via its MIF4G domain and escorts the helicase to the spliceosome while blocking its premature RNA binding.\",\n      \"evidence\": \"Co-IP, recombinant in vitro binding, interface mutagenesis, in vitro splicing/deposition assays, and RNAi rescue in Drosophila and human cells across independent labs\",\n      \"pmids\": [\"22959432\", \"22961380\", \"23236153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the inhibitory binding mode not yet defined\", \"Did not separate splicing from EJC-deposition activities cleanly until mutant analysis\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the structural mechanism for eIF4A3 inhibition, explaining how CWC22 prevents nonspecific RNA binding by locking both RecA domains in an inactive orientation.\",\n      \"evidence\": \"X-ray crystallography at 2.0 Å of the eIF4AIII–CWC22 MIF4G complex\",\n      \"pmids\": [\"24218557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not capture the conformational transition that activates eIF4A3 on the spliceosome\", \"No structure of CWC22 within the assembled spliceosome\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that CWC22's splicing and EJC-assembly functions are genetically separable, defining the minimal core and a spliceosome-enhancing C-terminal region.\",\n      \"evidence\": \"Domain deletion, eIF4A3-binding-deficient mutants, RNAi depletion, and high-throughput RNA-seq in human cells\",\n      \"pmids\": [\"25870412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the C-terminal domain enhances spliceosome interaction undefined\", \"Spliceosomal contacts beyond eIF4A3 not mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified CWC27 as a stable CWC22 partner and showed the two form a structural landing platform that recruits eIF4A3 at the Bact stage before C-complex conversion.\",\n      \"evidence\": \"Reciprocal co-IP, 3 Å crystal structure of the eIF4A3/CWC22/CWC27 ternary complex, modeling against spliceosome structures, and siRNA RNA-seq in retinal cells\",\n      \"pmids\": [\"32329775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of platform disassembly during Bact-to-C transition not observed\", \"Whether CWC27 contributes catalytically or only structurally unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended CWC22 beyond core splicing biology into disease physiology, showing its upregulation impairs sensory neuron function in diabetic nerves.\",\n      \"evidence\": \"Protein quantification in DRG, in vitro siRNA neurite outgrowth assay, and in vivo axonal siRNA delivery with sensory behavioral testing\",\n      \"pmids\": [\"28250049\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular splicing targets driving the neuronal phenotype not identified\", \"Link to canonical EJC/splicing function not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed evolutionary plasticity of CWC22 by demonstrating that a CWC22 duplicate became the housefly male-determining factor controlling sex-specific splicing.\",\n      \"evidence\": \"Genetic identification, targeted disruption with sex-reversal phenotype, and downstream transformer/doublesex splicing analysis\",\n      \"pmids\": [\"28495751\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism distinguishing the neofunctionalized paralog from ancestral CWC22 not detailed\", \"Relevance to mammalian CWC22 function indirect\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected CWC22-dependent alternative splicing to a physiological output, identifying Spp1 variant 4 as a required mediator of CWC22-driven nociception.\",\n      \"evidence\": \"Lentiviral knockdown/overexpression in spinal dorsal horn, behavioral pain tests, RNA-seq, and splicing assays\",\n      \"pmids\": [\"37838283\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How CWC22 selects the Spp1 V4 splice choice mechanistically unclear\", \"Single-lab, single-pathway readout\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Revealed a mitotic role for CWC22, showing it is required for spindle assembly checkpoint function by sustaining BubR1 expression and CDK1 activity.\",\n      \"evidence\": \"siRNA knockdown with flow cytometry, live-cell imaging, RNA-seq, and rescue by BubR1 overexpression, cyclin B1 overexpression, and Wee1 inhibition in cancer cells\",\n      \"pmids\": [\"41534835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether BubR1/CDK1 effects are direct splicing consequences not established\", \"Generalizability beyond the cancer cell models tested unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CWC22's global splicing/EJC activity is selectively channeled into distinct tissue-specific outcomes (sensory neuron function, nociception, mitotic checkpoint) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified mechanism linking core EJC function to the divergent disease phenotypes\", \"Direct splicing targets underlying each phenotype largely unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 3, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 4, 5]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\"spliceosome\", \"exon junction complex\", \"CWC22–CWC27 heterodimer\"],\n    \"partners\": [\"EIF4A3\", \"CWC27\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}