{"gene":"DMWD","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":1992,"finding":"DMWD (DMR-N9) was identified as an active gene in close proximity to the DMPK gene, with transcripts mainly expressed in brain and testis, possessing a single large open reading frame encoding a protein of unknown function.","method":"cDNA characterization, Northern blotting","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 — initial gene characterization with expression profiling, single lab","pmids":["1302022"],"is_preprint":false},{"year":1995,"finding":"The DMWD protein (mouse DMR-N9) contains two WD repeat domains, placing it in a family of proteins engaged in signal transduction or cell regulatory functions. Expression is ubiquitous at low levels with enhanced expression in adult brain and testis, and in testis is restricted to secondary spermatocytes of stages VIII–XII of the spermatogenic cycle.","method":"Genomic sequencing, Northern blotting, RNA in situ hybridization","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — domain identification by sequence analysis combined with expression localization by in situ hybridization","pmids":["7633444"],"is_preprint":false},{"year":1999,"finding":"In DM1 patient cell lines, the level of DMWD RNA from the disease-associated allele is reduced by 20–50% in the cytoplasmic fraction compared to the wild-type allele, but no such reduction is observed in the nuclear fraction, indicating allele-specific post-transcriptional regulation of DMWD in DM1.","method":"Quantitative allele-specific RT-PCR on nuclear and cytoplasmic RNA fractions from DM cell lines","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — allele-specific quantitative assay with subcellular fractionation, single lab","pmids":["10400997"],"is_preprint":false},{"year":2003,"finding":"DMWD protein (doublet of ~70 kDa) is developmentally regulated in mouse brain: mRNA remains constant postnatally (P7–P21) while protein levels gradually increase, indicating post-transcriptional regulation. DMWD protein is distributed in a punctate fashion throughout the neural cell body, nucleus, and dendrites including synapses, but is excluded from axons, and is most prominent in synapse-dense brain areas.","method":"Western blotting, immunohistochemistry, immunofluorescence in developing mouse brain and neuronal cell cultures","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein localization by immunostaining with developmental time-course, single lab","pmids":["12691844"],"is_preprint":false},{"year":2021,"finding":"DMWD directly binds both USP12 and USP46 deubiquitinases, sharing the same binding interface on USP12 as WDR20 (suggesting mutually exclusive binding). DMWD promotes USP12 enzymatic activity. DMWD and WDR20 differentially modulate the subcellular localization of USP12, potentially directing the deubiquitinase complex to different substrate repertoires.","method":"Co-immunoprecipitation of epitope-tagged proteins, in silico interactome analysis, deubiquitinase activity assay, subcellular localization studies","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 — direct co-IP confirmed binding, enzymatic activity assay confirmed functional regulation, subcellular localization studied, multiple orthogonal methods in single study","pmids":["33844468"],"is_preprint":false},{"year":2019,"finding":"Genetic epistasis in mice shows that heterozygous loss of Dmwd combined with heterozygous mutations in Dmpk, Six5, and Mbnl1 (quadruple heterozygous) recapitulates major manifestations of congenital DM1 beyond those seen in triple heterozygous (Dmpk/Six5/Mbnl1) mice, demonstrating that Dmwd dosage reduction contributes to DM1 multisystemic phenotypes.","method":"Genetic epistasis — multigene heterozygous mouse models generated via haploid ESC injection, phenotypic analysis","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 — clean multigene KO mouse model with defined phenotypic readout, single lab","pmids":["31853004"],"is_preprint":false},{"year":2025,"finding":"Experimental perturbation of DMWD (Drosophila ortholog) in fly AD models showed that reversing the aberrant downregulation of DMWD was neuroprotective, reducing neuronal dysfunction in tau and amyloid AD fly models.","method":"Drosophila loss-of-function/gain-of-function in AD models, behavioral assays","journal":"American journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 — single Drosophila model study, no molecular mechanism defined beyond in vivo neuroprotection","pmids":["40215969"],"is_preprint":false}],"current_model":"DMWD is a WD repeat-containing protein that localizes to the neuronal cell body, nucleus, dendrites, and synapses (but not axons), directly binds and activates the USP12 (and USP46) deubiquitinases through a binding interface shared with WDR20 in a potentially mutually exclusive manner that differentially directs USP12 subcellular localization, and contributes — through haploinsufficiency — to multisystemic DM1 phenotypes in mouse models; its expression is post-transcriptionally regulated and reduced from the disease allele in DM1 cells."},"narrative":{"teleology":[{"year":1992,"claim":"Identification of DMWD as a transcribed gene adjacent to DMPK established it as a candidate contributor to myotonic dystrophy pathogenesis, though its function was entirely unknown.","evidence":"cDNA characterization and Northern blotting showing brain- and testis-enriched expression","pmids":["1302022"],"confidence":"Medium","gaps":["No protein function assigned","Expression data limited to Northern blot tissue survey","Relationship to DM1 phenotype unresolved"]},{"year":1995,"claim":"Recognition of two WD repeat domains in DMWD placed it in a protein family involved in signal transduction and regulatory scaffolding, providing the first structural clue to function.","evidence":"Genomic sequencing and RNA in situ hybridization in mouse testis","pmids":["7633444"],"confidence":"Medium","gaps":["No binding partners or enzymatic activity identified","WD repeat domains are highly versatile — specific molecular role unknown"]},{"year":1999,"claim":"Demonstration of allele-specific cytoplasmic reduction of DMWD RNA in DM1 cells established that the expanded CTG repeat affects DMWD expression post-transcriptionally, providing a mechanism for potential haploinsufficiency.","evidence":"Quantitative allele-specific RT-PCR on nuclear versus cytoplasmic RNA fractions from DM1 patient fibroblasts","pmids":["10400997"],"confidence":"Medium","gaps":["Mechanism of cytoplasmic RNA reduction (transport vs. degradation) not defined","Protein-level consequences not measured","Single cell-line study"]},{"year":2003,"claim":"Subcellular mapping of DMWD protein in neurons revealed somatodendritic and synaptic enrichment with axonal exclusion, and developmentally increasing protein despite stable mRNA, establishing post-transcriptional control and implicating DMWD in synaptic biology.","evidence":"Western blotting, immunohistochemistry, and immunofluorescence in developing mouse brain and cultured neurons","pmids":["12691844"],"confidence":"Medium","gaps":["No functional assay at the synapse performed","Post-transcriptional regulatory mechanism (translation vs. stability) undefined","Axonal exclusion mechanism unknown"]},{"year":2019,"claim":"A multigene heterozygous mouse model demonstrated that Dmwd dosage reduction contributes to congenital DM1 manifestations beyond those caused by Dmpk, Six5, and Mbnl1 haploinsufficiency alone, establishing DMWD as a functional contributor to DM1 pathogenesis.","evidence":"Genetic epistasis using quadruple heterozygous mice generated via haploid ESC injection with systematic phenotypic analysis","pmids":["31853004"],"confidence":"Medium","gaps":["Specific downstream pathways affected by Dmwd haploinsufficiency not identified","Single mouse model; contribution of individual organs not dissected","Whether DMWD reduction alone is sufficient for any DM1-like phenotype untested"]},{"year":2021,"claim":"Identification of DMWD as a direct binding partner and activator of USP12/USP46 deubiquitinases — competing with WDR20 for the same interface and redirecting USP12 localization — provided the first defined molecular function for DMWD.","evidence":"Co-immunoprecipitation of epitope-tagged proteins, deubiquitinase activity assays, and subcellular localization studies in cultured cells","pmids":["33844468"],"confidence":"High","gaps":["Endogenous substrates of the DMWD–USP12 complex not identified","Whether mutually exclusive binding with WDR20 occurs in vivo under physiological conditions not confirmed","Structural basis of the shared binding interface not resolved at atomic level"]},{"year":null,"claim":"The endogenous substrates deubiquitinated by DMWD-directed USP12 complexes, and how loss of this activity mechanistically drives the neuronal and multisystemic phenotypes of DM1, remain unknown.","evidence":"","pmids":[],"confidence":"Low","gaps":["No USP12 substrates specific to DMWD-containing complexes identified","Synaptic function of DMWD not tested by loss-of-function in neurons","Relationship between deubiquitinase activation and DM1 phenotypes not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4]}],"complexes":[],"partners":["USP12","USP46"],"other_free_text":[]},"mechanistic_narrative":"DMWD is a WD repeat-containing protein enriched in brain and testis that functions as a direct activator of the USP12 and USP46 deubiquitinases, binding USP12 at the same interface as WDR20 in a mutually exclusive manner and differentially directing USP12 subcellular localization to potentially distinct substrate repertoires [PMID:33844468]. In neurons, DMWD localizes to the cell body, nucleus, dendrites, and synapses but is excluded from axons, and its protein levels are post-transcriptionally regulated during brain development [PMID:12691844]. Haploinsufficiency of Dmwd in a multigene heterozygous mouse model contributes to multisystemic phenotypes of myotonic dystrophy type 1 (DM1), and DMWD transcript levels from the disease allele are selectively reduced in the cytoplasm of DM1 patient cells [PMID:31853004, PMID:10400997]."},"prefetch_data":{"uniprot":{"accession":"Q09019","full_name":"Dystrophia myotonica WD repeat-containing protein","aliases":["Dystrophia myotonica-containing WD repeat motif protein","Protein 59","Protein DMR-N9"],"length_aa":674,"mass_kda":70.4,"function":"Regulator of the deubiquitinating USP12/DMWD/WDR48 complex (PubMed:33844468). Functions as a cofactor that promotes USP12 enzymatic activity (PubMed:33844468)","subcellular_location":"Cytoplasm; Nucleus; Perikaryon; Cell projection, dendrite","url":"https://www.uniprot.org/uniprotkb/Q09019/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DMWD","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DMWD","total_profiled":1310},"omim":[{"mim_id":"609857","title":"DYSTROPHIA MYOTONICA WD REPEAT-CONTAINING PROTEIN; DMWD","url":"https://www.omim.org/entry/609857"},{"mim_id":"607548","title":"RADIAL SPOKE HEAD 6 HOMOLOG A; RSPH6A","url":"https://www.omim.org/entry/607548"},{"mim_id":"605377","title":"DYSTROPHIA MYOTONICA PROTEIN KINASE; DMPK","url":"https://www.omim.org/entry/605377"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Actin filaments","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DMWD"},"hgnc":{"alias_symbol":["DMR-N9","gene59","D19S593E"],"prev_symbol":[]},"alphafold":{"accession":"Q09019","domains":[{"cath_id":"2.130.10.10","chopping":"289-383_425-453_579-635","consensus_level":"medium","plddt":92.8625,"start":289,"end":635}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q09019","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q09019-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q09019-F1-predicted_aligned_error_v6.png","plddt_mean":67.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DMWD","jax_strain_url":"https://www.jax.org/strain/search?query=DMWD"},"sequence":{"accession":"Q09019","fasta_url":"https://rest.uniprot.org/uniprotkb/Q09019.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q09019/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q09019"}},"corpus_meta":[{"pmid":"1302022","id":"PMC_1302022","title":"Characterization of the myotonic dystrophy region predicts multiple protein isoform-encoding mRNAs.","date":"1992","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1302022","citation_count":155,"is_preprint":false},{"pmid":"10400997","id":"PMC_10400997","title":"Myotonic dystrophy is associated with a reduced level of RNA from the DMWD allele adjacent to the expanded repeat.","date":"1999","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10400997","citation_count":66,"is_preprint":false},{"pmid":"7905855","id":"PMC_7905855","title":"Genomic organization and transcriptional units at the myotonic dystrophy locus.","date":"1993","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/7905855","citation_count":64,"is_preprint":false},{"pmid":"9872056","id":"PMC_9872056","title":"Expanding complexity in myotonic dystrophy.","date":"1998","source":"BioEssays : news and reviews in molecular, cellular and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/9872056","citation_count":61,"is_preprint":false},{"pmid":"7633444","id":"PMC_7633444","title":"Structural organization and developmental expression pattern of the mouse WD-repeat gene DMR-N9 immediately upstream of the myotonic dystrophy locus.","date":"1995","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/7633444","citation_count":52,"is_preprint":false},{"pmid":"10852476","id":"PMC_10852476","title":"The Aspergillus nidulans creC gene involved in carbon catabolite repression encodes a WD40 repeat protein.","date":"2000","source":"Molecular & general genetics : MGG","url":"https://pubmed.ncbi.nlm.nih.gov/10852476","citation_count":39,"is_preprint":false},{"pmid":"11592825","id":"PMC_11592825","title":"Effect of triplet repeat expansion on chromatin structure and expression of DMPK and neighboring genes, SIX5 and DMWD, in myotonic dystrophy.","date":"2001","source":"Molecular genetics and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/11592825","citation_count":33,"is_preprint":false},{"pmid":"14526185","id":"PMC_14526185","title":"Transgenic mouse models for myotonic dystrophy type 1 (DM1).","date":"2003","source":"Cytogenetic and genome research","url":"https://pubmed.ncbi.nlm.nih.gov/14526185","citation_count":24,"is_preprint":false},{"pmid":"26756355","id":"PMC_26756355","title":"Epigenetics of the myotonic dystrophy-associated DMPK gene neighborhood.","date":"2016","source":"Epigenomics","url":"https://pubmed.ncbi.nlm.nih.gov/26756355","citation_count":22,"is_preprint":false},{"pmid":"31853004","id":"PMC_31853004","title":"Dosage effect of multiple genes accounts for multisystem disorder of myotonic dystrophy type 1.","date":"2019","source":"Cell research","url":"https://pubmed.ncbi.nlm.nih.gov/31853004","citation_count":21,"is_preprint":false},{"pmid":"12691844","id":"PMC_12691844","title":"The DMWD protein from the myotonic dystrophy (DM1) gene region is developmentally regulated and is present most prominently in synapse-dense brain areas.","date":"2003","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/12691844","citation_count":17,"is_preprint":false},{"pmid":"11527424","id":"PMC_11527424","title":"Decreased DMPK transcript levels in myotonic dystrophy 1 type IIA muscle fibers.","date":"2001","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11527424","citation_count":13,"is_preprint":false},{"pmid":"27034888","id":"PMC_27034888","title":"Methyl-Arginine Profile of Brain from Aged PINK1-KO+A53T-SNCA Mice Suggests Altered Mitochondrial Biogenesis.","date":"2016","source":"Parkinson's disease","url":"https://pubmed.ncbi.nlm.nih.gov/27034888","citation_count":13,"is_preprint":false},{"pmid":"10748037","id":"PMC_10748037","title":"Independent regulation of the myotonic dystrophy 1 locus genes postnatally and during adult skeletal muscle regeneration.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10748037","citation_count":12,"is_preprint":false},{"pmid":"12778326","id":"PMC_12778326","title":"Searching for candidate genes for male infertility.","date":"2003","source":"Asian journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/12778326","citation_count":9,"is_preprint":false},{"pmid":"40215969","id":"PMC_40215969","title":"Computational and functional prioritization identifies genes that rescue behavior and reduce tau protein in fly and human cell models of Alzheimer disease.","date":"2025","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40215969","citation_count":5,"is_preprint":false},{"pmid":"33844468","id":"PMC_33844468","title":"The dystrophia myotonica WD repeat-containing protein DMWD and WDR20 differentially regulate USP12 deubiquitinase.","date":"2021","source":"The FEBS 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hepatology","url":"https://pubmed.ncbi.nlm.nih.gov/42021999","citation_count":0,"is_preprint":false},{"pmid":"41959118","id":"PMC_41959118","title":"Functional Analysis of Late-Onset Alzheimer's Disease Risk Genes in Caenorhabditis elegans Identifies Regulators of Neuronal Aging.","date":"2026","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41959118","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10660,"output_tokens":1623,"usd":0.028163},"stage2":{"model":"claude-opus-4-6","input_tokens":4897,"output_tokens":1703,"usd":0.10059},"total_usd":0.128753,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"DMWD (DMR-N9) was identified as an active gene in close proximity to the DMPK gene, with transcripts mainly expressed in brain and testis, possessing a single large open reading frame encoding a protein of unknown function.\",\n      \"method\": \"cDNA characterization, Northern blotting\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — initial gene characterization with expression profiling, single lab\",\n      \"pmids\": [\"1302022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The DMWD protein (mouse DMR-N9) contains two WD repeat domains, placing it in a family of proteins engaged in signal transduction or cell regulatory functions. Expression is ubiquitous at low levels with enhanced expression in adult brain and testis, and in testis is restricted to secondary spermatocytes of stages VIII–XII of the spermatogenic cycle.\",\n      \"method\": \"Genomic sequencing, Northern blotting, RNA in situ hybridization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — domain identification by sequence analysis combined with expression localization by in situ hybridization\",\n      \"pmids\": [\"7633444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In DM1 patient cell lines, the level of DMWD RNA from the disease-associated allele is reduced by 20–50% in the cytoplasmic fraction compared to the wild-type allele, but no such reduction is observed in the nuclear fraction, indicating allele-specific post-transcriptional regulation of DMWD in DM1.\",\n      \"method\": \"Quantitative allele-specific RT-PCR on nuclear and cytoplasmic RNA fractions from DM cell lines\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — allele-specific quantitative assay with subcellular fractionation, single lab\",\n      \"pmids\": [\"10400997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DMWD protein (doublet of ~70 kDa) is developmentally regulated in mouse brain: mRNA remains constant postnatally (P7–P21) while protein levels gradually increase, indicating post-transcriptional regulation. DMWD protein is distributed in a punctate fashion throughout the neural cell body, nucleus, and dendrites including synapses, but is excluded from axons, and is most prominent in synapse-dense brain areas.\",\n      \"method\": \"Western blotting, immunohistochemistry, immunofluorescence in developing mouse brain and neuronal cell cultures\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization by immunostaining with developmental time-course, single lab\",\n      \"pmids\": [\"12691844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DMWD directly binds both USP12 and USP46 deubiquitinases, sharing the same binding interface on USP12 as WDR20 (suggesting mutually exclusive binding). DMWD promotes USP12 enzymatic activity. DMWD and WDR20 differentially modulate the subcellular localization of USP12, potentially directing the deubiquitinase complex to different substrate repertoires.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins, in silico interactome analysis, deubiquitinase activity assay, subcellular localization studies\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct co-IP confirmed binding, enzymatic activity assay confirmed functional regulation, subcellular localization studied, multiple orthogonal methods in single study\",\n      \"pmids\": [\"33844468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Genetic epistasis in mice shows that heterozygous loss of Dmwd combined with heterozygous mutations in Dmpk, Six5, and Mbnl1 (quadruple heterozygous) recapitulates major manifestations of congenital DM1 beyond those seen in triple heterozygous (Dmpk/Six5/Mbnl1) mice, demonstrating that Dmwd dosage reduction contributes to DM1 multisystemic phenotypes.\",\n      \"method\": \"Genetic epistasis — multigene heterozygous mouse models generated via haploid ESC injection, phenotypic analysis\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean multigene KO mouse model with defined phenotypic readout, single lab\",\n      \"pmids\": [\"31853004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Experimental perturbation of DMWD (Drosophila ortholog) in fly AD models showed that reversing the aberrant downregulation of DMWD was neuroprotective, reducing neuronal dysfunction in tau and amyloid AD fly models.\",\n      \"method\": \"Drosophila loss-of-function/gain-of-function in AD models, behavioral assays\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single Drosophila model study, no molecular mechanism defined beyond in vivo neuroprotection\",\n      \"pmids\": [\"40215969\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DMWD is a WD repeat-containing protein that localizes to the neuronal cell body, nucleus, dendrites, and synapses (but not axons), directly binds and activates the USP12 (and USP46) deubiquitinases through a binding interface shared with WDR20 in a potentially mutually exclusive manner that differentially directs USP12 subcellular localization, and contributes — through haploinsufficiency — to multisystemic DM1 phenotypes in mouse models; its expression is post-transcriptionally regulated and reduced from the disease allele in DM1 cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DMWD is a WD repeat-containing protein enriched in brain and testis that functions as a direct activator of the USP12 and USP46 deubiquitinases, binding USP12 at the same interface as WDR20 in a mutually exclusive manner and differentially directing USP12 subcellular localization to potentially distinct substrate repertoires [PMID:33844468]. In neurons, DMWD localizes to the cell body, nucleus, dendrites, and synapses but is excluded from axons, and its protein levels are post-transcriptionally regulated during brain development [PMID:12691844]. Haploinsufficiency of Dmwd in a multigene heterozygous mouse model contributes to multisystemic phenotypes of myotonic dystrophy type 1 (DM1), and DMWD transcript levels from the disease allele are selectively reduced in the cytoplasm of DM1 patient cells [PMID:31853004, PMID:10400997].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Identification of DMWD as a transcribed gene adjacent to DMPK established it as a candidate contributor to myotonic dystrophy pathogenesis, though its function was entirely unknown.\",\n      \"evidence\": \"cDNA characterization and Northern blotting showing brain- and testis-enriched expression\",\n      \"pmids\": [\"1302022\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No protein function assigned\",\n        \"Expression data limited to Northern blot tissue survey\",\n        \"Relationship to DM1 phenotype unresolved\"\n      ]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Recognition of two WD repeat domains in DMWD placed it in a protein family involved in signal transduction and regulatory scaffolding, providing the first structural clue to function.\",\n      \"evidence\": \"Genomic sequencing and RNA in situ hybridization in mouse testis\",\n      \"pmids\": [\"7633444\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No binding partners or enzymatic activity identified\",\n        \"WD repeat domains are highly versatile — specific molecular role unknown\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstration of allele-specific cytoplasmic reduction of DMWD RNA in DM1 cells established that the expanded CTG repeat affects DMWD expression post-transcriptionally, providing a mechanism for potential haploinsufficiency.\",\n      \"evidence\": \"Quantitative allele-specific RT-PCR on nuclear versus cytoplasmic RNA fractions from DM1 patient fibroblasts\",\n      \"pmids\": [\"10400997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism of cytoplasmic RNA reduction (transport vs. degradation) not defined\",\n        \"Protein-level consequences not measured\",\n        \"Single cell-line study\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Subcellular mapping of DMWD protein in neurons revealed somatodendritic and synaptic enrichment with axonal exclusion, and developmentally increasing protein despite stable mRNA, establishing post-transcriptional control and implicating DMWD in synaptic biology.\",\n      \"evidence\": \"Western blotting, immunohistochemistry, and immunofluorescence in developing mouse brain and cultured neurons\",\n      \"pmids\": [\"12691844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional assay at the synapse performed\",\n        \"Post-transcriptional regulatory mechanism (translation vs. stability) undefined\",\n        \"Axonal exclusion mechanism unknown\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A multigene heterozygous mouse model demonstrated that Dmwd dosage reduction contributes to congenital DM1 manifestations beyond those caused by Dmpk, Six5, and Mbnl1 haploinsufficiency alone, establishing DMWD as a functional contributor to DM1 pathogenesis.\",\n      \"evidence\": \"Genetic epistasis using quadruple heterozygous mice generated via haploid ESC injection with systematic phenotypic analysis\",\n      \"pmids\": [\"31853004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific downstream pathways affected by Dmwd haploinsufficiency not identified\",\n        \"Single mouse model; contribution of individual organs not dissected\",\n        \"Whether DMWD reduction alone is sufficient for any DM1-like phenotype untested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of DMWD as a direct binding partner and activator of USP12/USP46 deubiquitinases — competing with WDR20 for the same interface and redirecting USP12 localization — provided the first defined molecular function for DMWD.\",\n      \"evidence\": \"Co-immunoprecipitation of epitope-tagged proteins, deubiquitinase activity assays, and subcellular localization studies in cultured cells\",\n      \"pmids\": [\"33844468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endogenous substrates of the DMWD–USP12 complex not identified\",\n        \"Whether mutually exclusive binding with WDR20 occurs in vivo under physiological conditions not confirmed\",\n        \"Structural basis of the shared binding interface not resolved at atomic level\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endogenous substrates deubiquitinated by DMWD-directed USP12 complexes, and how loss of this activity mechanistically drives the neuronal and multisystemic phenotypes of DM1, remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No USP12 substrates specific to DMWD-containing complexes identified\",\n        \"Synaptic function of DMWD not tested by loss-of-function in neurons\",\n        \"Relationship between deubiquitinase activation and DM1 phenotypes not established\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"USP12\",\n      \"USP46\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}