{"gene":"DSP","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1991,"finding":"The desmoplakin gene (DSP, encoding DPI/II) was assigned to human chromosome 6p21-ter by PCR assay on human-mouse and human-rat somatic cell hybrids.","method":"PCR-based chromosomal assignment using somatic cell hybrids","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromosomal mapping by somatic cell hybrid panel, single lab, single method","pmids":["1889810"],"is_preprint":false},{"year":2010,"finding":"Homozygous truncating deletion in DSP (c.2874del5) causing loss of the rod domain and C-terminus results in absence of the desmosomal inner dense plaque and lack of tonofilament insertion in skin, demonstrating that the desmoplakin rod domain is essential for inner dense plaque formation and intermediate filament anchorage.","method":"DSP mutation analysis, electron microscopy of skin biopsies","journal":"The British journal of dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function human mutation with direct ultrastructural phenotypic readout (EM), single study","pmids":["20302578"],"is_preprint":false},{"year":2008,"finding":"Compound heterozygous frameshift mutations in DSP (c.2516del4 and c.3971del4) cause ectodermal dysplasia-skin fragility syndrome with early-onset cardiomyopathy; the mutation c.3971del4 occurs only in the longer desmoplakin-I isoform (the major cardiac transcript), explaining the cardiac phenotype, while PKP1 mutations causing similar skin disease lack cardiac involvement because PKP1 is not expressed in the heart.","method":"DSP mutation analysis, isoform-specific genotype-phenotype correlation","journal":"The British journal of dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-level genotype-phenotype correlation in human patients, single study with clear mechanistic inference","pmids":["19016709"],"is_preprint":false},{"year":2015,"finding":"De novo missense mutations clustered within spectrin repeat 6 (SR6) of DSP cause erythrokeratodermia-cardiomyopathy (EKC) syndrome and result in aberrant localization of desmosomal proteins and connexin 43 in skin, desmosome aggregation, widening of intercellular spaces, and lipid secretory defects, identifying SR6 as a region critical for desmoplakin function in heart and skin.","method":"Human genetic analysis, immunofluorescence localization of desmosomal proteins and connexin 43, electron microscopy of skin","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments plus ultrastructural analysis in patient tissue, single lab","pmids":["26604139"],"is_preprint":false},{"year":2015,"finding":"DSP spectrin repeat 6 domain mutations cause an ichthyosis with T helper 1 and T helper 17/IL-23 skewing in skin and Th17/IL-22 skewing in blood, defining the inflammatory immunophenotype of DSP SR6-mutation-associated skin disease.","method":"Immunophenotyping of blood and skin, targeted ustekinumab therapy with clinical response","journal":"Journal of the American Academy of Dermatology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient immunophenotyping, no direct molecular mechanism of DSP in immune signaling established","pmids":["29066275"],"is_preprint":false},{"year":2018,"finding":"Matrix stiffness regulates DSP (desmoplakin) gene expression in lung epithelial cells: stiff matrix promotes DSP overexpression via demethylation of a conserved proximal promoter region, enabling binding of transcription factor EGR1 to drive DSP transcription; CRISPR/dCas9-Dnmt3A-mediated targeted methylation of this promoter region blocks EGR1 binding and reverses stiff matrix-induced DSP overexpression.","method":"Polyacrylamide gel stiffness system, quantitative ChIP, EMSA, CRISPR/dCas9-Dnmt3A epigenome editing","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (ChIP, EMSA, CRISPR functional editing) in a single study establishing EGR1-dependent transcriptional mechanism","pmids":["29924937"],"is_preprint":false},{"year":2020,"finding":"The DSP-H1684R missense variant in desmoplakin reduces sodium Nav1.5 current amplitude and L-type calcium current amplitude, and increases transient-outward potassium current in iPSC-derived cardiomyocytes, resulting in shortened action potential duration, demonstrating that desmoplakin variants can directly alter ion channel activity.","method":"iPSC-derived cardiomyocytes from patient with H1684R variant, whole-cell voltage-clamp and current-clamp electrophysiology, immunofluorescence, western blot","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-specific iPSC-CM model with direct electrophysiological measurements, single lab, multiple ion channels assessed","pmids":["32706220"],"is_preprint":false},{"year":2015,"finding":"A spontaneous frameshift mutation in the mouse Dsp gene (Dsp rul) truncating desmoplakin at the C-terminus and removing the majority of the plakin repeat domain causes abnormal hair coat, diffuse epidermal blistering, abnormal ECGs, and ventricular fibrosis, recapitulating human Carvajal-Huerta syndrome and demonstrating that the plakin repeat domain C-terminus is required for normal cardiac and skin desmosomal function.","method":"High-throughput sequencing to identify Dsp mutation, histopathology, ECG analysis in mice","journal":"Experimental and molecular pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function mouse model with defined structural and electrical cardiac phenotypes, single study","pmids":["25659760"],"is_preprint":false},{"year":2022,"finding":"Introduction of the murine equivalent of human DSP R451G variant (Dsp heterozygous knock-in mice) results in viable mice with reduced DSP expression and aberrant localization of connexin-43 at baseline; cardiac stress via pressure overload induces reduced cardiac performance, chamber dilation, and heart failure progression, while catecholaminergic challenge unmasks frequent and prolonged ventricular arrhythmias, demonstrating that connexin-43 mislocalization and stress-triggered electrical instability are consequences of this desmoplakin variant.","method":"Humanized knock-in mouse model, pressure overload, catecholaminergic stress challenge, connexin-43 immunofluorescence, cardiac functional measurements","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — humanized mouse model with multiple stress paradigms and direct localization experiments, single lab","pmids":["36231013"],"is_preprint":false},{"year":2022,"finding":"DSP truncating variant location is an independent risk factor for ventricular arrhythmia; variants causing nonsense-mediated decay of both major DSP isoforms are significantly enriched in affected cases versus population controls, implying that complete loss of desmoplakin expression from both isoforms confers greater arrhythmic risk than haploinsufficiency affecting only one isoform.","method":"Multicenter cohort, variant location analysis, comparison with ClinVar and gnomAD controls, survival analysis for ventricular arrhythmia","journal":"Circulation. Genomic and precision medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — large multicenter genotype-phenotype study with isoform-level mechanistic inference, replicated across multiple centers","pmids":["36580316"],"is_preprint":false}],"current_model":"Desmoplakin (DSP) is the primary structural linker of desmosomes in epithelia and myocardium, anchoring intermediate filaments via its C-terminal plakin repeat domain to the desmosomal plaque; its expression is regulated by matrix stiffness through EGR1-dependent promoter demethylation, and pathogenic variants—particularly those truncating the C-terminus or rod domain—disrupt inner dense plaque formation, intermediate filament attachment, and connexin-43 localization, while also altering Nav1.5 and L-type calcium channel activity in cardiomyocytes, collectively producing arrhythmogenic cardiomyopathy, skin fragility, and cardio-cutaneous syndromes."},"narrative":{"mechanistic_narrative":"Desmoplakin (DSP) is the central structural component of the desmosomal plaque that anchors intermediate filaments and maintains tissue integrity in skin and myocardium [PMID:20302578, PMID:25659760]. Its C-terminal plakin repeat domain and rod domain are essential for forming the inner dense plaque and inserting tonofilaments; homozygous truncation removing the rod and C-terminus abolishes inner dense plaque formation and intermediate filament anchorage, while truncation of the plakin repeat domain recapitulates combined cardiac and cutaneous disease [PMID:20302578, PMID:25659760]. The protein is expressed as two isoforms, and the longer desmoplakin-I transcript is the major cardiac isoform, explaining why isoform-specific truncations dictate cardiac involvement and why variants causing nonsense-mediated decay of both isoforms confer greater arrhythmic risk than haploinsufficiency of one [PMID:19016709, PMID:36580316]. Beyond structural anchorage, DSP variants disrupt junctional organization more broadly: missense mutations clustered in spectrin repeat 6 cause aberrant localization of desmosomal proteins and connexin-43, desmosome aggregation, and lipid secretory defects in skin [PMID:26604139], and reduced DSP expression mislocalizes connexin-43 and, under hemodynamic and catecholaminergic stress, drives heart failure and ventricular arrhythmias [PMID:36231013]. DSP variants also directly alter cardiomyocyte electrophysiology, reducing Nav1.5 sodium and L-type calcium currents and increasing transient-outward potassium current to shorten action potential duration [PMID:32706220]. DSP transcription is controlled by mechanical cues: stiff matrix demethylates a proximal promoter region permitting EGR1 binding to drive DSP overexpression, a process reversible by targeted promoter methylation [PMID:29924937]. Collectively, these mechanisms produce arrhythmogenic cardiomyopathy, skin fragility, and cardio-cutaneous syndromes [PMID:19016709, PMID:26604139, PMID:25659760].","teleology":[{"year":1991,"claim":"Establishing the chromosomal location of DSP provided the genomic anchor needed to link the gene to inherited disease loci.","evidence":"PCR-based chromosomal assignment using human-rodent somatic cell hybrid panels","pmids":["1889810"],"confidence":"Medium","gaps":["No functional or mechanistic information about the protein","No isoform structure defined at this stage"]},{"year":2008,"claim":"Isoform-specific frameshift mutations resolved why DSP defects produce cardiac involvement while related desmosomal gene defects do not, linking the cardiac phenotype to the desmoplakin-I isoform expressed in heart.","evidence":"Human DSP mutation analysis with isoform-level genotype-phenotype correlation in ectodermal dysplasia-skin fragility patients","pmids":["19016709"],"confidence":"Medium","gaps":["Mechanism connecting isoform loss to specific cardiac structural defect not shown at molecular level","Single study"]},{"year":2010,"claim":"A homozygous truncating deletion established that the rod domain and C-terminus are required for inner dense plaque assembly and intermediate filament anchorage in vivo.","evidence":"DSP mutation analysis with electron microscopy of patient skin biopsies","pmids":["20302578"],"confidence":"Medium","gaps":["Does not isolate rod versus C-terminal contributions","Skin readout only; cardiac ultrastructure not examined"]},{"year":2015,"claim":"Mapping de novo missense mutations to spectrin repeat 6 identified a specific functional region whose disruption mislocalizes desmosomal proteins and connexin-43 and impairs lipid secretion.","evidence":"Human genetics with immunofluorescence and electron microscopy in patient skin (EKC syndrome)","pmids":["26604139"],"confidence":"Medium","gaps":["Molecular interaction partner of SR6 not defined","Cardiac mechanism of SR6 variants not directly assayed"]},{"year":2015,"claim":"A C-terminal plakin repeat domain truncation in mouse demonstrated in a controlled genetic background that this domain is required for both cardiac and cutaneous desmosomal function.","evidence":"Spontaneous mouse Dsp frameshift mutant with histopathology and ECG analysis","pmids":["25659760"],"confidence":"Medium","gaps":["Does not dissect cell-autonomous mechanism","Molecular consequence for filament binding not directly measured"]},{"year":2015,"claim":"Immunophenotyping of an SR6-mutation patient described a Th1/Th17/IL-23 inflammatory signature accompanying DSP skin disease.","evidence":"Blood and skin immunophenotyping with targeted ustekinumab therapy in a single patient","pmids":["29066275"],"confidence":"Low","gaps":["Single patient; no direct molecular link between DSP and immune signaling established","Causality between DSP loss and cytokine skewing unproven"]},{"year":2018,"claim":"Identifying matrix stiffness-driven, EGR1-dependent promoter demethylation defined a mechanotransduction mechanism controlling DSP expression beyond its structural role.","evidence":"Polyacrylamide stiffness system with ChIP, EMSA, and CRISPR/dCas9-Dnmt3A epigenome editing in lung epithelial cells","pmids":["29924937"],"confidence":"High","gaps":["Mechanism by which stiffness triggers demethylation upstream of EGR1 not defined","Relevance to cardiac DSP regulation not tested"]},{"year":2020,"claim":"Patient iPSC-cardiomyocytes showed that a DSP missense variant directly alters ion channel currents, expanding DSP pathology from structural failure to electrical dysfunction.","evidence":"iPSC-derived cardiomyocytes with whole-cell voltage- and current-clamp electrophysiology (H1684R variant)","pmids":["32706220"],"confidence":"Medium","gaps":["Mechanism linking DSP to channel function not resolved","Single variant in single patient line"]},{"year":2022,"claim":"A humanized knock-in mouse demonstrated that reduced DSP causes connexin-43 mislocalization at baseline and stress-triggered arrhythmias and heart failure, connecting variant burden to a physiological disease trajectory.","evidence":"Dsp R451G knock-in mice with pressure overload, catecholaminergic challenge, connexin-43 immunofluorescence, and cardiac functional measurements","pmids":["36231013"],"confidence":"Medium","gaps":["Molecular basis of connexin-43 mislocalization not defined","Single variant model"]},{"year":2022,"claim":"A multicenter cohort established that truncating variant location, specifically loss of both isoforms via nonsense-mediated decay, independently predicts ventricular arrhythmia risk.","evidence":"Multicenter cohort with variant-location and survival analysis against ClinVar/gnomAD controls","pmids":["36580316"],"confidence":"Medium","gaps":["Does not establish molecular threshold of DSP dosage for arrhythmia","Mechanistic link between dosage and electrical instability inferred, not measured"]},{"year":null,"claim":"The molecular mechanism by which desmoplakin variants alter ion channel currents and connexin-43 localization remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct physical link between DSP and Nav1.5, L-type calcium channels, or connexin-43 trafficking established","Domain-resolved structural model of DSP-intermediate filament anchorage not defined in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,7]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,7]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,3,8]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,3]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,7,9]}],"complexes":["desmosome"],"partners":["GJA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P15924","full_name":"Desmoplakin","aliases":["250/210 kDa paraneoplastic pemphigus antigen"],"length_aa":2871,"mass_kda":331.8,"function":"A component of desmosome cell-cell junctions which are required for positive regulation of cellular adhesion (PubMed:25733715). Critical for cell-cell adhesion in early stage blastocysts and progression through proamniotic cavity formation (By similarity). Not required for preimplantation morphogenic process in blastocysts (By similarity). Required for keratin filament anchoring at the desmosome junction and subsequent organization of the keratin intermediate filament network within the cytoplasm (By similarity). Required for anchoring of desmosomes to the microtubule architecture, via its interaction with NIN (By similarity). Plays a key role in adhesion and organization of the dermal epithelial barrier (By similarity). Critical for the maintenance of the neural tube structure following formation and organization of the neuroepithelium (By similarity). Facilitates outgrowth and repair of motor neuron fibers in regenerating axons following injury, probably by promoting recruitment of a complex containing DSP, CDH2, VIM and JUP to the outgrowth tips (By similarity). Required for the normal formation of the heart, also required for development of vascular capillary structures and intact endothelial cell barriers (By similarity). Regulates profibrotic gene expression in cardiomyocytes via activation of the MAPK14/p38 MAPK signaling cascade and increase in TGFB1 protein abundance (By similarity). Maintains cardiac rhythmicity by ensuring correct cell-cell adhesion within the sinoatrial node, via stabilization of protein components of both desmosome and Gap junctions (By similarity). Involved in maintaining the protein stability and recruitment of GJA1 to functional gap junctions, via inhibition of KRAS-mediated MAPK1/MAPK3 phosphorylation of GJA1 (By similarity). Required for the survival and maintenance of germ cells in the gonads during embryonic development (By similarity). Binds to telomere DNA (via C-terminus) and acts to prevent telomere damage and maintain telomere length via its interaction with TRF2 (PubMed:31595153)","subcellular_location":"Cell projection, axon; Cell junction, desmosome; Cell membrane; Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P15924/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DSP","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"KRT18","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DSP","total_profiled":1310},"omim":[{"mim_id":"620411","title":"PALMOPLANTAR KERATODERMA, EPIDERMOLYTIC, 2; EPPK2","url":"https://www.omim.org/entry/620411"},{"mim_id":"618368","title":"DUAL-SPECIFICITY PHOSPHATASE 26; DUSP26","url":"https://www.omim.org/entry/618368"},{"mim_id":"618301","title":"KAZRIN, PERIPLAKIN-INTERACTING PROTEIN; KAZN","url":"https://www.omim.org/entry/618301"},{"mim_id":"618052","title":"CARDIOMYOPATHY, FAMILIAL HYPERTROPHIC, 27; CMH27","url":"https://www.omim.org/entry/618052"},{"mim_id":"617294","title":"EPIDERMOLYSIS BULLOSA SIMPLEX 6, GENERALIZED INTERMEDIATE, WITH OR WITHOUT CARDIOMYOPATHY; EBS6","url":"https://www.omim.org/entry/617294"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cell Junctions","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":437.5},{"tissue":"skin 1","ntpm":807.7}],"url":"https://www.proteinatlas.org/search/DSP"},"hgnc":{"alias_symbol":["KPPS2","PPKS2","DPI","DPII","DP"],"prev_symbol":[]},"alphafold":{"accession":"P15924","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P15924","model_url":"https://alphafold.ebi.ac.uk/files/AF-P15924-2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P15924-2-F1-predicted_aligned_error_v6.png","plddt_mean":75.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DSP","jax_strain_url":"https://www.jax.org/strain/search?query=DSP"},"sequence":{"accession":"P15924","fasta_url":"https://rest.uniprot.org/uniprotkb/P15924.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P15924/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P15924"}},"corpus_meta":[{"pmid":"2747911","id":"PMC_2747911","title":"Immunohistochemical analysis of the neurotoxic effects of DSP-4 identifies two populations of noradrenergic axon 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Evaluation of the NucliSens Magnetic Extraction system and the QIAamp DSP Virus Kit in comparison with the QIAamp DNA Blood Mini Kit.","date":"2007","source":"Prenatal diagnosis","url":"https://pubmed.ncbi.nlm.nih.gov/17154236","citation_count":48,"is_preprint":false},{"pmid":"37953397","id":"PMC_37953397","title":"standR: spatial transcriptomic analysis for GeoMx DSP data.","date":"2024","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/37953397","citation_count":47,"is_preprint":false},{"pmid":"15541395","id":"PMC_15541395","title":"FGF-2 potently induces both proliferation and DSP expression in collagen type I gel cultures of adult incisor immature pulp cells.","date":"2004","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/15541395","citation_count":47,"is_preprint":false},{"pmid":"29924937","id":"PMC_29924937","title":"Reversing Mechanoinductive DSP Expression by CRISPR/dCas9-mediated Epigenome 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mutation.","date":"2018","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/30160835","citation_count":10,"is_preprint":false},{"pmid":"33472408","id":"PMC_33472408","title":"The effect of NADPH oxidase inhibitor diphenyleneiodonium (DPI) and glutathione (GSH) on Isatis cappadocica, under Arsenic (As) toxicity.","date":"2021","source":"International journal of phytoremediation","url":"https://pubmed.ncbi.nlm.nih.gov/33472408","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54049,"output_tokens":3213,"usd":0.105171,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9742,"output_tokens":3242,"usd":0.06488,"stage2_stop_reason":"end_turn"},"total_usd":0.170051,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about the canonical DSP gene (desmoplakin, HGNC symbol DSP, aliases KPPS2, PPKS2, DPI, DPII). This is the gene encoding desmoplakin, a major desmosomal protein.\n\nI need to exclude:\n- DSP-4 (neurotoxin) papers [1,11,13,17,18,35,47,54,64,71,79,92,98]\n- Dentin sialoprotein (DSP) papers - this is DSPP/DSP in odontoblasts, a different protein [3,7,10,14,15,25,32,39,41,48,61,65,72,91]\n- DPI as diphenyleneiodonium (NADPH oxidase inhibitor) [6,21,34,38,44,100]\n- DPI as transcription factor DP-1 [4]\n- DPI-ELISA (plant method) [8]\n- Myxococcus xanthus dsp [22,46,58,78]\n- Barley dsp [55]\n- Various pharmacological DPI compounds [42,60,66,74,80,83,84]\n- DSP toxins (diarrhetic shellfish poisoning) [31,33,56,62,85,89]\n- Other unrelated uses of DSP/DPI acronyms [2,5,12,19,20,23,24,27,36,37,40,43,49,50,53,57,59,67,68,69,70,73,75,77,88,90,93,94,95,96]\n\nPapers about canonical desmoplakin (DSP):\n- [9] Chromosomal assignment\n- [16] DSP spectrin repeat 6 mutations - ichthyosis/cardiomyopathy\n- [26] Mechanoinductive DSP expression via EGR1\n- [28] De novo DSP mutations - EKC syndrome, desmosomal protein localization\n- [29] DSP deletion - LAEB, desmosomal structure\n- [30] DSP frameshift mutations - skin/cardiac phenotype\n- [45] DSP homozygous mutation - skin fragility-woolly hair\n- [51] DSP truncating variants - arrhythmogenic cardiomyopathy\n- [52] DSP rare variants - SUNDS\n- [63] DSP cardiomyopathy cohort\n- [68] Humanized Dsp ACM mouse model\n- [76] DSP p.(Thr2104Glnfs*12) - DCM/arrhythmia\n- [81] DSP-H1684R - ion channel activity in iPSC-CMs\n- [82] Dsp rul mouse - Carvajal-Huerta syndrome model\n- [86] SAM syndrome - DSP de novo mutation\n- [87] Cardiovascular characteristics - DSP variants\n- [99] DSP nonsense mutation - biventricular ACM\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1991,\n      \"finding\": \"The desmoplakin gene (DSP, encoding DPI/II) was assigned to human chromosome 6p21-ter by PCR assay on human-mouse and human-rat somatic cell hybrids.\",\n      \"method\": \"PCR-based chromosomal assignment using somatic cell hybrids\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromosomal mapping by somatic cell hybrid panel, single lab, single method\",\n      \"pmids\": [\"1889810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Homozygous truncating deletion in DSP (c.2874del5) causing loss of the rod domain and C-terminus results in absence of the desmosomal inner dense plaque and lack of tonofilament insertion in skin, demonstrating that the desmoplakin rod domain is essential for inner dense plaque formation and intermediate filament anchorage.\",\n      \"method\": \"DSP mutation analysis, electron microscopy of skin biopsies\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function human mutation with direct ultrastructural phenotypic readout (EM), single study\",\n      \"pmids\": [\"20302578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Compound heterozygous frameshift mutations in DSP (c.2516del4 and c.3971del4) cause ectodermal dysplasia-skin fragility syndrome with early-onset cardiomyopathy; the mutation c.3971del4 occurs only in the longer desmoplakin-I isoform (the major cardiac transcript), explaining the cardiac phenotype, while PKP1 mutations causing similar skin disease lack cardiac involvement because PKP1 is not expressed in the heart.\",\n      \"method\": \"DSP mutation analysis, isoform-specific genotype-phenotype correlation\",\n      \"journal\": \"The British journal of dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-level genotype-phenotype correlation in human patients, single study with clear mechanistic inference\",\n      \"pmids\": [\"19016709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"De novo missense mutations clustered within spectrin repeat 6 (SR6) of DSP cause erythrokeratodermia-cardiomyopathy (EKC) syndrome and result in aberrant localization of desmosomal proteins and connexin 43 in skin, desmosome aggregation, widening of intercellular spaces, and lipid secretory defects, identifying SR6 as a region critical for desmoplakin function in heart and skin.\",\n      \"method\": \"Human genetic analysis, immunofluorescence localization of desmosomal proteins and connexin 43, electron microscopy of skin\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments plus ultrastructural analysis in patient tissue, single lab\",\n      \"pmids\": [\"26604139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DSP spectrin repeat 6 domain mutations cause an ichthyosis with T helper 1 and T helper 17/IL-23 skewing in skin and Th17/IL-22 skewing in blood, defining the inflammatory immunophenotype of DSP SR6-mutation-associated skin disease.\",\n      \"method\": \"Immunophenotyping of blood and skin, targeted ustekinumab therapy with clinical response\",\n      \"journal\": \"Journal of the American Academy of Dermatology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient immunophenotyping, no direct molecular mechanism of DSP in immune signaling established\",\n      \"pmids\": [\"29066275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Matrix stiffness regulates DSP (desmoplakin) gene expression in lung epithelial cells: stiff matrix promotes DSP overexpression via demethylation of a conserved proximal promoter region, enabling binding of transcription factor EGR1 to drive DSP transcription; CRISPR/dCas9-Dnmt3A-mediated targeted methylation of this promoter region blocks EGR1 binding and reverses stiff matrix-induced DSP overexpression.\",\n      \"method\": \"Polyacrylamide gel stiffness system, quantitative ChIP, EMSA, CRISPR/dCas9-Dnmt3A epigenome editing\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (ChIP, EMSA, CRISPR functional editing) in a single study establishing EGR1-dependent transcriptional mechanism\",\n      \"pmids\": [\"29924937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The DSP-H1684R missense variant in desmoplakin reduces sodium Nav1.5 current amplitude and L-type calcium current amplitude, and increases transient-outward potassium current in iPSC-derived cardiomyocytes, resulting in shortened action potential duration, demonstrating that desmoplakin variants can directly alter ion channel activity.\",\n      \"method\": \"iPSC-derived cardiomyocytes from patient with H1684R variant, whole-cell voltage-clamp and current-clamp electrophysiology, immunofluorescence, western blot\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-specific iPSC-CM model with direct electrophysiological measurements, single lab, multiple ion channels assessed\",\n      \"pmids\": [\"32706220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A spontaneous frameshift mutation in the mouse Dsp gene (Dsp rul) truncating desmoplakin at the C-terminus and removing the majority of the plakin repeat domain causes abnormal hair coat, diffuse epidermal blistering, abnormal ECGs, and ventricular fibrosis, recapitulating human Carvajal-Huerta syndrome and demonstrating that the plakin repeat domain C-terminus is required for normal cardiac and skin desmosomal function.\",\n      \"method\": \"High-throughput sequencing to identify Dsp mutation, histopathology, ECG analysis in mice\",\n      \"journal\": \"Experimental and molecular pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function mouse model with defined structural and electrical cardiac phenotypes, single study\",\n      \"pmids\": [\"25659760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Introduction of the murine equivalent of human DSP R451G variant (Dsp heterozygous knock-in mice) results in viable mice with reduced DSP expression and aberrant localization of connexin-43 at baseline; cardiac stress via pressure overload induces reduced cardiac performance, chamber dilation, and heart failure progression, while catecholaminergic challenge unmasks frequent and prolonged ventricular arrhythmias, demonstrating that connexin-43 mislocalization and stress-triggered electrical instability are consequences of this desmoplakin variant.\",\n      \"method\": \"Humanized knock-in mouse model, pressure overload, catecholaminergic stress challenge, connexin-43 immunofluorescence, cardiac functional measurements\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — humanized mouse model with multiple stress paradigms and direct localization experiments, single lab\",\n      \"pmids\": [\"36231013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DSP truncating variant location is an independent risk factor for ventricular arrhythmia; variants causing nonsense-mediated decay of both major DSP isoforms are significantly enriched in affected cases versus population controls, implying that complete loss of desmoplakin expression from both isoforms confers greater arrhythmic risk than haploinsufficiency affecting only one isoform.\",\n      \"method\": \"Multicenter cohort, variant location analysis, comparison with ClinVar and gnomAD controls, survival analysis for ventricular arrhythmia\",\n      \"journal\": \"Circulation. Genomic and precision medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — large multicenter genotype-phenotype study with isoform-level mechanistic inference, replicated across multiple centers\",\n      \"pmids\": [\"36580316\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Desmoplakin (DSP) is the primary structural linker of desmosomes in epithelia and myocardium, anchoring intermediate filaments via its C-terminal plakin repeat domain to the desmosomal plaque; its expression is regulated by matrix stiffness through EGR1-dependent promoter demethylation, and pathogenic variants—particularly those truncating the C-terminus or rod domain—disrupt inner dense plaque formation, intermediate filament attachment, and connexin-43 localization, while also altering Nav1.5 and L-type calcium channel activity in cardiomyocytes, collectively producing arrhythmogenic cardiomyopathy, skin fragility, and cardio-cutaneous syndromes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Desmoplakin (DSP) is the central structural component of the desmosomal plaque that anchors intermediate filaments and maintains tissue integrity in skin and myocardium [#1, #7]. Its C-terminal plakin repeat domain and rod domain are essential for forming the inner dense plaque and inserting tonofilaments; homozygous truncation removing the rod and C-terminus abolishes inner dense plaque formation and intermediate filament anchorage, while truncation of the plakin repeat domain recapitulates combined cardiac and cutaneous disease [#1, #7]. The protein is expressed as two isoforms, and the longer desmoplakin-I transcript is the major cardiac isoform, explaining why isoform-specific truncations dictate cardiac involvement and why variants causing nonsense-mediated decay of both isoforms confer greater arrhythmic risk than haploinsufficiency of one [#2, #9]. Beyond structural anchorage, DSP variants disrupt junctional organization more broadly: missense mutations clustered in spectrin repeat 6 cause aberrant localization of desmosomal proteins and connexin-43, desmosome aggregation, and lipid secretory defects in skin [#3], and reduced DSP expression mislocalizes connexin-43 and, under hemodynamic and catecholaminergic stress, drives heart failure and ventricular arrhythmias [#8]. DSP variants also directly alter cardiomyocyte electrophysiology, reducing Nav1.5 sodium and L-type calcium currents and increasing transient-outward potassium current to shorten action potential duration [#6]. DSP transcription is controlled by mechanical cues: stiff matrix demethylates a proximal promoter region permitting EGR1 binding to drive DSP overexpression, a process reversible by targeted promoter methylation [#5]. Collectively, these mechanisms produce arrhythmogenic cardiomyopathy, skin fragility, and cardio-cutaneous syndromes [#2, #3, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the chromosomal location of DSP provided the genomic anchor needed to link the gene to inherited disease loci.\",\n      \"evidence\": \"PCR-based chromosomal assignment using human-rodent somatic cell hybrid panels\",\n      \"pmids\": [\"1889810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional or mechanistic information about the protein\", \"No isoform structure defined at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Isoform-specific frameshift mutations resolved why DSP defects produce cardiac involvement while related desmosomal gene defects do not, linking the cardiac phenotype to the desmoplakin-I isoform expressed in heart.\",\n      \"evidence\": \"Human DSP mutation analysis with isoform-level genotype-phenotype correlation in ectodermal dysplasia-skin fragility patients\",\n      \"pmids\": [\"19016709\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting isoform loss to specific cardiac structural defect not shown at molecular level\", \"Single study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A homozygous truncating deletion established that the rod domain and C-terminus are required for inner dense plaque assembly and intermediate filament anchorage in vivo.\",\n      \"evidence\": \"DSP mutation analysis with electron microscopy of patient skin biopsies\",\n      \"pmids\": [\"20302578\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not isolate rod versus C-terminal contributions\", \"Skin readout only; cardiac ultrastructure not examined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapping de novo missense mutations to spectrin repeat 6 identified a specific functional region whose disruption mislocalizes desmosomal proteins and connexin-43 and impairs lipid secretion.\",\n      \"evidence\": \"Human genetics with immunofluorescence and electron microscopy in patient skin (EKC syndrome)\",\n      \"pmids\": [\"26604139\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular interaction partner of SR6 not defined\", \"Cardiac mechanism of SR6 variants not directly assayed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A C-terminal plakin repeat domain truncation in mouse demonstrated in a controlled genetic background that this domain is required for both cardiac and cutaneous desmosomal function.\",\n      \"evidence\": \"Spontaneous mouse Dsp frameshift mutant with histopathology and ECG analysis\",\n      \"pmids\": [\"25659760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not dissect cell-autonomous mechanism\", \"Molecular consequence for filament binding not directly measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Immunophenotyping of an SR6-mutation patient described a Th1/Th17/IL-23 inflammatory signature accompanying DSP skin disease.\",\n      \"evidence\": \"Blood and skin immunophenotyping with targeted ustekinumab therapy in a single patient\",\n      \"pmids\": [\"29066275\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single patient; no direct molecular link between DSP and immune signaling established\", \"Causality between DSP loss and cytokine skewing unproven\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying matrix stiffness-driven, EGR1-dependent promoter demethylation defined a mechanotransduction mechanism controlling DSP expression beyond its structural role.\",\n      \"evidence\": \"Polyacrylamide stiffness system with ChIP, EMSA, and CRISPR/dCas9-Dnmt3A epigenome editing in lung epithelial cells\",\n      \"pmids\": [\"29924937\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which stiffness triggers demethylation upstream of EGR1 not defined\", \"Relevance to cardiac DSP regulation not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Patient iPSC-cardiomyocytes showed that a DSP missense variant directly alters ion channel currents, expanding DSP pathology from structural failure to electrical dysfunction.\",\n      \"evidence\": \"iPSC-derived cardiomyocytes with whole-cell voltage- and current-clamp electrophysiology (H1684R variant)\",\n      \"pmids\": [\"32706220\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking DSP to channel function not resolved\", \"Single variant in single patient line\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A humanized knock-in mouse demonstrated that reduced DSP causes connexin-43 mislocalization at baseline and stress-triggered arrhythmias and heart failure, connecting variant burden to a physiological disease trajectory.\",\n      \"evidence\": \"Dsp R451G knock-in mice with pressure overload, catecholaminergic challenge, connexin-43 immunofluorescence, and cardiac functional measurements\",\n      \"pmids\": [\"36231013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of connexin-43 mislocalization not defined\", \"Single variant model\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A multicenter cohort established that truncating variant location, specifically loss of both isoforms via nonsense-mediated decay, independently predicts ventricular arrhythmia risk.\",\n      \"evidence\": \"Multicenter cohort with variant-location and survival analysis against ClinVar/gnomAD controls\",\n      \"pmids\": [\"36580316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish molecular threshold of DSP dosage for arrhythmia\", \"Mechanistic link between dosage and electrical instability inferred, not measured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which desmoplakin variants alter ion channel currents and connexin-43 localization remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct physical link between DSP and Nav1.5, L-type calcium channels, or connexin-43 trafficking established\", \"Domain-resolved structural model of DSP-intermediate filament anchorage not defined in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 3, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 7, 9]}\n    ],\n    \"complexes\": [\"desmosome\"],\n    \"partners\": [\"GJA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}