{"gene":"DMWD","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1992,"finding":"DMR-N9 (DMWD) is a distinct gene immediately upstream of the DM-kinase 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, genomic mapping","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — initial gene identification by cDNA/Northern, replicated by multiple subsequent papers confirming expression pattern","pmids":["1302022"],"is_preprint":false},{"year":1995,"finding":"The mouse DMR-N9 (DMWD) protein contains two WD repeat domains, classifying it in a family of proteins engaged in signal transduction or cell regulatory functions. The gene has five exons spanning 7 kb encoding a 650 amino acid protein, with expression onset at embryonic day 9.5 and enhanced expression in adult brain (telencephalon, mesencephalon) and testis (restricted to secondary spermatocytes at stages VIII–XII of spermatogenic cycle).","method":"Genomic cloning, sequence analysis, Northern blotting, RNA in situ hybridization","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — domain assignment by sequence analysis replicated across labs; expression pattern established by in situ hybridization and Northern blotting","pmids":["7633444"],"is_preprint":false},{"year":2003,"finding":"DMWD protein (doublet of ~70 kDa) is developmentally regulated in mouse brain: mRNA levels remain constant between postnatal days P7–P21 while protein levels increase, indicating post-transcriptional regulation. DMWD is localized in a punctate fashion throughout the neuronal cell body, nucleus, and dendrites/synapses, but is excluded from axons; it is most prominent in synapse-dense neuropil areas and expressed at low levels in glial cells.","method":"Western blotting, immunohistochemistry, subcellular fractionation, in vitro neuronal culture differentiation","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — protein localization by immunohistochemistry and fractionation in multiple tissue/culture systems, single lab","pmids":["12691844"],"is_preprint":false},{"year":1999,"finding":"In DM1 patient cell lines, the DMWD allele carrying the CTG repeat expansion shows 20–50% reduced RNA levels specifically in the cytoplasmic fraction compared to wild-type allele, but no reduction in the nuclear fraction, indicating that repeat expansion causes allele-specific post-transcriptional reduction of DMWD mRNA.","method":"Allele-specific quantitative RT-PCR of nuclear and cytoplasmic RNA fractions from DM cell lines using identified DMWD polymorphism","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative allele-specific assay on fractionated RNA, single lab with clear controls","pmids":["10400997"],"is_preprint":false},{"year":2021,"finding":"DMWD directly binds both USP12 and USP46 deubiquitinases (confirmed by co-immunoprecipitation of epitope-tagged proteins). DMWD and its paralog WDR20 share the same binding interface on USP12, suggesting mutually exclusive binding. Both DMWD and WDR20 promote USP12 enzymatic activity, but they differentially modulate the subcellular localization of USP12, potentially directing the deubiquitinase to distinct substrate repertoires.","method":"Co-immunoprecipitation of epitope-tagged proteins, deubiquitinase activity assays, subcellular localization analysis, phylogenetic/molecular evolution analysis","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-IP confirmed binding, enzymatic activity assay confirmed functional activation, subcellular localization measured; single lab with multiple orthogonal methods","pmids":["33844468"],"is_preprint":false},{"year":2019,"finding":"Genetic epistasis in mice shows that quadruple heterozygous loss of Dmpk, Six5, Mbnl1, and Dmwd recapitulates major congenital DM1 manifestations, whereas triple heterozygous mice (lacking Dmwd mutation) show only adult-onset DM1 phenotypes, indicating that reduced Dmwd dosage contributes specifically to congenital DM1 features.","method":"Genetic epistasis via multigene heterozygous mouse models generated by haploid embryonic stem cell injection; behavioral and physiological phenotyping","journal":"Cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic epistasis in vivo with defined phenotypic readout, single study","pmids":["31853004"],"is_preprint":false},{"year":2025,"finding":"In Drosophila AD models, experimental perturbation of DMWD ortholog modulates neuronal dysfunction, and reversing its aberrant misexpression is neuroprotective in vivo, placing DMWD in a pathway relevant to neuronal survival.","method":"Drosophila transgenic AD models (wild-type tau and secreted Aβ42); genetic perturbation with behavioral readout","journal":"American journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single functional perturbation in fly model, no direct molecular mechanism identified for DMWD specifically","pmids":["40215969"],"is_preprint":false}],"current_model":"DMWD (DMR-N9/gene59) encodes a WD-repeat-containing protein that localizes to neuronal cell bodies, nuclei, and synaptic dendrites (excluded from axons); it directly binds and activates the USP12 (and USP46) deubiquitinase through the same interface as its paralog WDR20 in a likely mutually exclusive manner that differentially directs USP12 subcellular localization, while in vivo genetic epistasis in mice demonstrates that reduced DMWD dosage contributes to congenital DM1 phenotypes, and repeat-expansion in DM1 patients causes allele-specific post-transcriptional reduction of DMWD mRNA in the cytoplasm."},"narrative":{"mechanistic_narrative":"DMWD (originally DMR-N9/gene59) is a WD-repeat-containing protein expressed predominantly in brain and testis that functions as an activating cofactor for the USP12/USP46 deubiquitinases and contributes to the congenital phenotypes of myotonic dystrophy type 1 (DM1) [PMID:7633444, PMID:33844468, PMID:31853004]. The protein localizes in a punctate pattern throughout the neuronal cell body, nucleus, and dendrites/synapses while being excluded from axons, and is most prominent in synapse-dense neuropil [PMID:12691844]. Mechanistically, DMWD directly binds USP12 and USP46 and stimulates their deubiquitinase activity; it engages the same interface on USP12 as its paralog WDR20, implying mutually exclusive binding, and the two cofactors differentially direct USP12 to distinct subcellular locations and therefore distinct substrate pools [PMID:33844468]. DMWD lies immediately upstream of the DM-protein kinase gene, and in DM1 patient cells the CTG repeat-expanded allele shows allele-specific post-transcriptional reduction of DMWD mRNA confined to the cytoplasmic fraction [PMID:1302022, PMID:10400997]; mouse genetic epistasis establishes that reduced Dmwd dosage specifically contributes to congenital DM1 manifestations [PMID:31853004]. DMWD protein levels are post-transcriptionally upregulated during postnatal brain development independent of mRNA changes [PMID:12691844].","teleology":[{"year":1992,"claim":"Established DMWD as a discrete transcribed gene immediately upstream of the DM-kinase locus, distinguishing it from neighboring DM1 genes and defining its brain/testis expression—a prerequisite for asking whether it independently contributes to disease.","evidence":"cDNA characterization, Northern blotting and genomic mapping at the DM1 locus","pmids":["1302022"],"confidence":"Medium","gaps":["No protein function assigned","Open reading frame product uncharacterized"]},{"year":1995,"claim":"Identified two WD-repeat domains in the protein, placing DMWD in a family implicated in signal transduction/cell regulation and providing the first structural clue to its molecular role, alongside defining its developmental and cell-type expression.","evidence":"Genomic cloning, sequence analysis, Northern blotting and RNA in situ hybridization in mouse","pmids":["7633444"],"confidence":"Medium","gaps":["WD-repeat domain assignment did not identify binding partners","No biochemical activity demonstrated"]},{"year":1999,"claim":"Showed that the CTG repeat expansion acts in cis to reduce DMWD mRNA specifically in the cytoplasm of patient cells, providing a mechanism by which DM1 lowers DMWD expression beyond the kinase gene.","evidence":"Allele-specific quantitative RT-PCR on nuclear and cytoplasmic RNA fractions from DM patient cell lines","pmids":["10400997"],"confidence":"Medium","gaps":["Mechanism of the cytoplasmic-specific reduction not defined","Functional consequence of reduced DMWD not tested here"]},{"year":2003,"claim":"Defined DMWD's subcellular distribution to neuronal cell body, nucleus and dendrites/synapses (excluded from axons) and demonstrated post-transcriptional upregulation of protein during brain development, linking it to synaptic compartments.","evidence":"Western blotting, immunohistochemistry, subcellular fractionation and in vitro neuronal differentiation","pmids":["12691844"],"confidence":"Medium","gaps":["No molecular partners identified at synapses","Functional role at dendrites/synapses not established"]},{"year":2019,"claim":"Demonstrated by in vivo genetic epistasis that reduced Dmwd dosage contributes specifically to congenital (not adult-onset) DM1 features, establishing DMWD as a causal contributor to the disease phenotype rather than a bystander gene.","evidence":"Multigene heterozygous mouse models with behavioral/physiological phenotyping","pmids":["31853004"],"confidence":"Medium","gaps":["Molecular pathway through which Dmwd dosage acts not defined","Cell type responsible for congenital phenotype not resolved"]},{"year":2021,"claim":"Identified the first direct biochemical function of DMWD: it binds and activates USP12/USP46 deubiquitinases through the same interface as paralog WDR20 and differentially controls their subcellular localization, defining DMWD as a deubiquitinase-activating cofactor.","evidence":"Co-immunoprecipitation of tagged proteins, deubiquitinase activity assays, subcellular localization and phylogenetic analysis","pmids":["33844468"],"confidence":"Medium","gaps":["Substrates directed by DMWD-bound USP12 not identified","Mutual exclusivity with WDR20 inferred, not directly shown","Link between DUB activation and DM1/neuronal phenotypes untested"]},{"year":2025,"claim":"Placed the DMWD ortholog in a pathway relevant to neuronal survival by showing its perturbation modulates neurodegeneration and that correcting its misexpression is neuroprotective in fly AD models.","evidence":"Drosophila transgenic AD models (tau and Aβ42) with genetic perturbation and behavioral readout","pmids":["40215969"],"confidence":"Low","gaps":["No direct molecular mechanism for DMWD identified","Single fly-model perturbation; relevance to mammalian DMWD unconfirmed","Connection to USP12/46 activity not tested"]},{"year":null,"claim":"How DMWD-directed USP12/USP46 deubiquitination connects to its synaptic localization and to congenital DM1 phenotypes remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No substrate of DMWD-activated DUB identified","No mechanistic bridge between cofactor activity and neuronal/disease phenotype"]}],"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":[2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3]}],"pathway":[],"complexes":[],"partners":["USP12","USP46","WDR20"],"other_free_text":[]}},"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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gene immediately upstream of the DM-kinase 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, genomic mapping\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — initial gene identification by cDNA/Northern, replicated by multiple subsequent papers confirming expression pattern\",\n      \"pmids\": [\"1302022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The mouse DMR-N9 (DMWD) protein contains two WD repeat domains, classifying it in a family of proteins engaged in signal transduction or cell regulatory functions. The gene has five exons spanning 7 kb encoding a 650 amino acid protein, with expression onset at embryonic day 9.5 and enhanced expression in adult brain (telencephalon, mesencephalon) and testis (restricted to secondary spermatocytes at stages VIII–XII of spermatogenic cycle).\",\n      \"method\": \"Genomic cloning, sequence analysis, Northern blotting, RNA in situ hybridization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — domain assignment by sequence analysis replicated across labs; expression pattern established by in situ hybridization and Northern blotting\",\n      \"pmids\": [\"7633444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DMWD protein (doublet of ~70 kDa) is developmentally regulated in mouse brain: mRNA levels remain constant between postnatal days P7–P21 while protein levels increase, indicating post-transcriptional regulation. DMWD is localized in a punctate fashion throughout the neuronal cell body, nucleus, and dendrites/synapses, but is excluded from axons; it is most prominent in synapse-dense neuropil areas and expressed at low levels in glial cells.\",\n      \"method\": \"Western blotting, immunohistochemistry, subcellular fractionation, in vitro neuronal culture differentiation\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — protein localization by immunohistochemistry and fractionation in multiple tissue/culture systems, single lab\",\n      \"pmids\": [\"12691844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"In DM1 patient cell lines, the DMWD allele carrying the CTG repeat expansion shows 20–50% reduced RNA levels specifically in the cytoplasmic fraction compared to wild-type allele, but no reduction in the nuclear fraction, indicating that repeat expansion causes allele-specific post-transcriptional reduction of DMWD mRNA.\",\n      \"method\": \"Allele-specific quantitative RT-PCR of nuclear and cytoplasmic RNA fractions from DM cell lines using identified DMWD polymorphism\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative allele-specific assay on fractionated RNA, single lab with clear controls\",\n      \"pmids\": [\"10400997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DMWD directly binds both USP12 and USP46 deubiquitinases (confirmed by co-immunoprecipitation of epitope-tagged proteins). DMWD and its paralog WDR20 share the same binding interface on USP12, suggesting mutually exclusive binding. Both DMWD and WDR20 promote USP12 enzymatic activity, but they differentially modulate the subcellular localization of USP12, potentially directing the deubiquitinase to distinct substrate repertoires.\",\n      \"method\": \"Co-immunoprecipitation of epitope-tagged proteins, deubiquitinase activity assays, subcellular localization analysis, phylogenetic/molecular evolution analysis\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-IP confirmed binding, enzymatic activity assay confirmed functional activation, subcellular localization measured; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33844468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Genetic epistasis in mice shows that quadruple heterozygous loss of Dmpk, Six5, Mbnl1, and Dmwd recapitulates major congenital DM1 manifestations, whereas triple heterozygous mice (lacking Dmwd mutation) show only adult-onset DM1 phenotypes, indicating that reduced Dmwd dosage contributes specifically to congenital DM1 features.\",\n      \"method\": \"Genetic epistasis via multigene heterozygous mouse models generated by haploid embryonic stem cell injection; behavioral and physiological phenotyping\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic epistasis in vivo with defined phenotypic readout, single study\",\n      \"pmids\": [\"31853004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Drosophila AD models, experimental perturbation of DMWD ortholog modulates neuronal dysfunction, and reversing its aberrant misexpression is neuroprotective in vivo, placing DMWD in a pathway relevant to neuronal survival.\",\n      \"method\": \"Drosophila transgenic AD models (wild-type tau and secreted Aβ42); genetic perturbation with behavioral readout\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single functional perturbation in fly model, no direct molecular mechanism identified for DMWD specifically\",\n      \"pmids\": [\"40215969\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DMWD (DMR-N9/gene59) encodes a WD-repeat-containing protein that localizes to neuronal cell bodies, nuclei, and synaptic dendrites (excluded from axons); it directly binds and activates the USP12 (and USP46) deubiquitinase through the same interface as its paralog WDR20 in a likely mutually exclusive manner that differentially directs USP12 subcellular localization, while in vivo genetic epistasis in mice demonstrates that reduced DMWD dosage contributes to congenital DM1 phenotypes, and repeat-expansion in DM1 patients causes allele-specific post-transcriptional reduction of DMWD mRNA in the cytoplasm.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DMWD (originally DMR-N9/gene59) is a WD-repeat-containing protein expressed predominantly in brain and testis that functions as an activating cofactor for the USP12/USP46 deubiquitinases and contributes to the congenital phenotypes of myotonic dystrophy type 1 (DM1) [#1, #4, #5]. The protein localizes in a punctate pattern throughout the neuronal cell body, nucleus, and dendrites/synapses while being excluded from axons, and is most prominent in synapse-dense neuropil [#2]. Mechanistically, DMWD directly binds USP12 and USP46 and stimulates their deubiquitinase activity; it engages the same interface on USP12 as its paralog WDR20, implying mutually exclusive binding, and the two cofactors differentially direct USP12 to distinct subcellular locations and therefore distinct substrate pools [#4]. DMWD lies immediately upstream of the DM-protein kinase gene, and in DM1 patient cells the CTG repeat-expanded allele shows allele-specific post-transcriptional reduction of DMWD mRNA confined to the cytoplasmic fraction [#0, #3]; mouse genetic epistasis establishes that reduced Dmwd dosage specifically contributes to congenital DM1 manifestations [#5]. DMWD protein levels are post-transcriptionally upregulated during postnatal brain development independent of mRNA changes [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established DMWD as a discrete transcribed gene immediately upstream of the DM-kinase locus, distinguishing it from neighboring DM1 genes and defining its brain/testis expression—a prerequisite for asking whether it independently contributes to disease.\",\n      \"evidence\": \"cDNA characterization, Northern blotting and genomic mapping at the DM1 locus\",\n      \"pmids\": [\"1302022\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No protein function assigned\", \"Open reading frame product uncharacterized\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identified two WD-repeat domains in the protein, placing DMWD in a family implicated in signal transduction/cell regulation and providing the first structural clue to its molecular role, alongside defining its developmental and cell-type expression.\",\n      \"evidence\": \"Genomic cloning, sequence analysis, Northern blotting and RNA in situ hybridization in mouse\",\n      \"pmids\": [\"7633444\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"WD-repeat domain assignment did not identify binding partners\", \"No biochemical activity demonstrated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed that the CTG repeat expansion acts in cis to reduce DMWD mRNA specifically in the cytoplasm of patient cells, providing a mechanism by which DM1 lowers DMWD expression beyond the kinase gene.\",\n      \"evidence\": \"Allele-specific quantitative RT-PCR on nuclear and cytoplasmic RNA fractions from DM patient cell lines\",\n      \"pmids\": [\"10400997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of the cytoplasmic-specific reduction not defined\", \"Functional consequence of reduced DMWD not tested here\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined DMWD's subcellular distribution to neuronal cell body, nucleus and dendrites/synapses (excluded from axons) and demonstrated post-transcriptional upregulation of protein during brain development, linking it to synaptic compartments.\",\n      \"evidence\": \"Western blotting, immunohistochemistry, subcellular fractionation and in vitro neuronal differentiation\",\n      \"pmids\": [\"12691844\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular partners identified at synapses\", \"Functional role at dendrites/synapses not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated by in vivo genetic epistasis that reduced Dmwd dosage contributes specifically to congenital (not adult-onset) DM1 features, establishing DMWD as a causal contributor to the disease phenotype rather than a bystander gene.\",\n      \"evidence\": \"Multigene heterozygous mouse models with behavioral/physiological phenotyping\",\n      \"pmids\": [\"31853004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway through which Dmwd dosage acts not defined\", \"Cell type responsible for congenital phenotype not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified the first direct biochemical function of DMWD: it binds and activates USP12/USP46 deubiquitinases through the same interface as paralog WDR20 and differentially controls their subcellular localization, defining DMWD as a deubiquitinase-activating cofactor.\",\n      \"evidence\": \"Co-immunoprecipitation of tagged proteins, deubiquitinase activity assays, subcellular localization and phylogenetic analysis\",\n      \"pmids\": [\"33844468\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrates directed by DMWD-bound USP12 not identified\", \"Mutual exclusivity with WDR20 inferred, not directly shown\", \"Link between DUB activation and DM1/neuronal phenotypes untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed the DMWD ortholog in a pathway relevant to neuronal survival by showing its perturbation modulates neurodegeneration and that correcting its misexpression is neuroprotective in fly AD models.\",\n      \"evidence\": \"Drosophila transgenic AD models (tau and Aβ42) with genetic perturbation and behavioral readout\",\n      \"pmids\": [\"40215969\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct molecular mechanism for DMWD identified\", \"Single fly-model perturbation; relevance to mammalian DMWD unconfirmed\", \"Connection to USP12/46 activity not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DMWD-directed USP12/USP46 deubiquitination connects to its synaptic localization and to congenital DM1 phenotypes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No substrate of DMWD-activated DUB identified\", \"No mechanistic bridge between cofactor activity and neuronal/disease phenotype\"]\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\": [2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"USP12\", \"USP46\", \"WDR20\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}