{"gene":"PNKD","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1996,"finding":"The gene responsible for autosomal dominant non-kinesiogenic familial paroxysmal dyskinesia (FPD1/PNKD) was mapped to chromosome 2q31-36 by linkage analysis in a segregating family (LOD score 4.64).","method":"Linkage analysis / genetic mapping","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean linkage analysis in a well-characterized family, single study establishing chromosomal locus","pmids":["8659517"],"is_preprint":false},{"year":2004,"finding":"MR-1 (PNKD) protein was identified as a myofibrillogenesis regulator in human skeletal muscle; yeast two-hybrid screening and in vitro binding assays showed it interacts with sarcomeric proteins myosin regulatory light chain (MLC2), myomesin 1, and beta-enolase.","method":"Yeast two-hybrid screening, in vitro binding assay, Northern blot, immunohistochemistry","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus in vitro binding confirms interaction with multiple partners, single lab","pmids":["15188056"],"is_preprint":false},{"year":2008,"finding":"MR-1 (PNKD) overexpression in hepatoma HepG2 cells promotes cell proliferation, migration, and adhesion via phosphorylation of MLC2, FAK, and Akt; siRNA knockdown of MR-1 reduced phosphorylation of MLC2, FAK, and Akt, destroyed stress fiber formation, and inhibited tumor growth in vivo. MLC2 activation and intact actin cytoskeleton were required for MR-1 function.","method":"siRNA knockdown, stable transfection, Western blot for phosphorylation, MLCK inhibitor and F-actin polymerization inhibitor treatment, in vivo xenograft","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular/molecular phenotype plus pharmacological inhibitors, single lab with multiple orthogonal approaches","pmids":["18948272"],"is_preprint":false},{"year":2009,"finding":"PNKD disease-causing mutations (A7V, A9V) reside within a mitochondrial targeting sequence (MTS) of 39 amino acids present in the MR-1L and MR-1S isoforms; these isoforms are imported into mitochondria and inserted into the inner mitochondrial membrane, where the MTS is cleaved. In contrast, mutation-free MR-1M localizes to Golgi, ER, and plasma membrane. A third mutation (A33P) was identified in the same MTS region. Wild-type and mutant proteins showed no difference in import efficiency or protein maturation, suggesting PNKD pathogenesis involves a deleterious action of the MTS itself rather than altered mature protein function.","method":"Subcellular fractionation, fluorescence microscopy (live imaging), import assays, mutation identification in new patient","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (fractionation, live imaging, import assays) in a single rigorous study establishing isoform-specific localization and mechanism","pmids":["19124534"],"is_preprint":false},{"year":2011,"finding":"The N-terminus of wild-type PNKD-L (long isoform) undergoes a cleavage event in vitro; disease-associated mutations (A7V or A9V) confer resistance to this cleavage. Mutant PNKD-L protein is degraded faster than wild-type, and decreased cortical Pnkd-L levels were observed in mutant transgenic mice. PNKD is homologous to the metallo-beta-lactamase superfamily (highest homology to glyoxalase II) but does not catalyze the glyoxalase II reaction. Lower glutathione levels were found in cortex lysates of Pnkd knockout mice compared to wild-type, implicating PNKD in cellular redox homeostasis.","method":"In vitro cleavage assay, protein stability assay in cultured cells, transgenic mouse cortex protein quantification, enzymatic activity assay (glyoxalase II substrate), glutathione measurement in knockout mouse cortex","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (in vitro assay, cell-based stability, transgenic mouse, knockout mouse biochemistry) in single rigorous study","pmids":["21487022"],"is_preprint":false},{"year":2017,"finding":"The PNKD long isoform (PNKD-L) self-oligomerizes and physically interacts with the synaptic active zone protein RIMS1α, as demonstrated by co-immunoprecipitation in neurons derived from iPSCs. A nonsense mutation in PNKD causing reduced PNKD-L protein levels (via nonsense-mediated mRNA decay) co-segregated with Tourette Disorder in a multiplex family.","method":"iPSC-derived neurons, co-immunoprecipitation, Western blot, whole exome sequencing","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP in disease-relevant cell type (iPSC neurons) demonstrating interaction with RIMS1α and self-oligomerization, single lab","pmids":["28894297"],"is_preprint":false}],"current_model":"PNKD (MR-1) encodes a protein with at least three alternatively spliced isoforms: MR-1L and MR-1S contain a mitochondrial targeting sequence (MTS) directing them to the inner mitochondrial membrane, while MR-1M localizes to the Golgi/ER/plasma membrane; the disease-causing A7V, A9V, and A33P mutations all map within the MTS, which normally undergoes cleavage—mutations confer resistance to this cleavage and accelerate protein degradation; PNKD-L is homologous to the metallo-beta-lactamase superfamily, does not catalyze glyoxalase II activity, but loss of PNKD reduces cellular glutathione levels, implicating it in redox homeostasis; PNKD-L self-oligomerizes and interacts with the synaptic active zone scaffold protein RIMS1α, and MR-1 also interacts with sarcomeric proteins (MLC2, myomesin 1, beta-enolase) and promotes cell migration via MLC2/FAK/Akt phosphorylation signaling."},"narrative":{"mechanistic_narrative":"PNKD (MR-1) is the gene whose mutation causes autosomal dominant non-kinesiogenic paroxysmal dyskinesia, originally mapped to chromosome 2q31-36 by family linkage analysis [PMID:8659517]. The gene produces alternatively spliced isoforms with distinct subcellular fates: the long and short isoforms (MR-1L/MR-1S) carry a 39-amino-acid mitochondrial targeting sequence (MTS) that directs import into the inner mitochondrial membrane where it is cleaved, while the mutation-free MR-1M isoform localizes to Golgi, ER, and plasma membrane [PMID:19124534]. All identified disease mutations (A7V, A9V, A33P) fall within this MTS; rather than altering mature protein function, the mutations render the N-terminal cleavage site resistant to processing and accelerate degradation of the protein, lowering cortical PNKD-L levels in mutant mice [PMID:19124534, PMID:21487022]. PNKD-L is homologous to the metallo-beta-lactamase superfamily but lacks glyoxalase II activity; nonetheless loss of PNKD reduces cellular glutathione, linking it to redox homeostasis [PMID:21487022]. At the synapse, PNKD-L self-oligomerizes and binds the active zone scaffold RIMS1α, and a loss-of-function PNKD variant co-segregates with Tourette Disorder [PMID:28894297]. Independently, MR-1 interacts with sarcomeric proteins (MLC2, myomesin 1, beta-enolase) and drives cell proliferation, migration, and adhesion through MLC2/FAK/Akt phosphorylation and stress fiber formation [PMID:15188056, PMID:18948272].","teleology":[{"year":1996,"claim":"Establishing the chromosomal locus for familial paroxysmal dyskinesia was the first step toward identifying the causative gene.","evidence":"Linkage analysis in a segregating family mapping the disorder to 2q31-36 (LOD 4.64)","pmids":["8659517"],"confidence":"Medium","gaps":["Did not identify the gene or causal variant","No molecular function implied"]},{"year":2004,"claim":"Identifying MR-1 binding partners gave the first clue to a molecular function, placing it in contact with sarcomeric machinery.","evidence":"Yeast two-hybrid and in vitro binding assays in skeletal muscle showing interaction with MLC2, myomesin 1, and beta-enolase","pmids":["15188056"],"confidence":"Medium","gaps":["Interactions not validated in neurons or in vivo","No connection to the dyskinesia phenotype established"]},{"year":2008,"claim":"Functional assays defined a signaling role for MR-1, showing it actively drives cytoskeletal remodeling and cell motility rather than acting passively.","evidence":"siRNA knockdown and overexpression in HepG2 cells with phospho-Western blots, pharmacological inhibitors, and xenograft assays linking MR-1 to MLC2/FAK/Akt phosphorylation and stress fibers","pmids":["18948272"],"confidence":"Medium","gaps":["Mechanism by which MR-1 activates these kinases unknown","Relevance to neuronal disease unclear"]},{"year":2009,"claim":"Resolving isoform-specific localization showed that disease mutations cluster in a mitochondrial targeting sequence, reframing pathogenesis around the MTS rather than the mature protein.","evidence":"Subcellular fractionation, live fluorescence imaging, and import assays of MR-1 isoforms plus mutation identification in a new patient","pmids":["19124534"],"confidence":"High","gaps":["No difference in import efficiency between wild-type and mutant left the toxic mechanism undefined","Mitochondrial function consequences not measured"]},{"year":2011,"claim":"Mechanistic dissection showed mutations block N-terminal cleavage and destabilize PNKD-L, and that PNKD loss lowers glutathione, tying the protein to redox balance.","evidence":"In vitro cleavage and protein-stability assays, transgenic and knockout mouse cortex biochemistry, glyoxalase II enzymatic assay, and glutathione measurement","pmids":["21487022"],"confidence":"High","gaps":["The enzymatic/biochemical activity of PNKD-L remains unidentified despite metallo-beta-lactamase homology","How reduced glutathione produces dyskinesia is unresolved"]},{"year":2017,"claim":"Demonstrating PNKD-L oligomerization and binding to the active zone scaffold RIMS1α connected the protein to synaptic machinery and broadened its disease association.","evidence":"Co-immunoprecipitation and Western blot in iPSC-derived neurons, plus whole exome sequencing of a Tourette Disorder family","pmids":["28894297"],"confidence":"Medium","gaps":["Co-IP not reciprocally validated or reconstituted","Functional consequence of the RIMS1α interaction at the synapse not tested"]},{"year":null,"claim":"The catalytic activity of PNKD-L and the mechanism linking MTS cleavage, glutathione homeostasis, and synaptic dysfunction to paroxysmal dyskinesia remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No demonstrated enzymatic substrate despite metallo-beta-lactamase homology","Causal chain from protein destabilization to episodic movement disorder not established"]}],"mechanism_profile":{"molecular_activity":[],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,4]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3]}],"pathway":[],"complexes":[],"partners":["RIMS1","MLC2","MYOM1","ENO3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N490","full_name":"Probable thioesterase PNKD","aliases":["Myofibrillogenesis regulator 1","MR-1","Paroxysmal nonkinesiogenic dyskinesia protein","Trans-activated by hepatitis C virus core protein 2"],"length_aa":385,"mass_kda":42.9,"function":"Probable thioesterase that may play a role in cellular detoxification processes; it likely acts on a yet-unknown alpha-hydroxythioester substrate (Probable). In vitro, it is able to catalyze the hydrolysis of S-D-lactoyl-glutathione to form glutathione and D-lactic acid at very low rate, though this reaction is not physiologically relevant in vivo (PubMed:21487022)","subcellular_location":"Mitochondrion; Golgi apparatus; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q8N490/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PNKD","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PNKD","total_profiled":1310},"omim":[{"mim_id":"617622","title":"JOUBERT SYNDROME 30; JBTS30","url":"https://www.omim.org/entry/617622"},{"mim_id":"617612","title":"ARMADILLO REPEAT-CONTAINING PROTEIN 9; ARMC9","url":"https://www.omim.org/entry/617612"},{"mim_id":"611147","title":"PAROXYSMAL NONKINESIGENIC DYSKINESIA 2; PNKD2","url":"https://www.omim.org/entry/611147"},{"mim_id":"609446","title":"PAROXYSMAL NONKINESIGENIC DYSKINESIA 3 WITH OR WITHOUT GENERALIZED EPILEPSY; PNKD3","url":"https://www.omim.org/entry/609446"},{"mim_id":"609023","title":"PNKD METALLO-BETA-LACTAMASE DOMAIN-CONTAINING PROTEIN; PNKD","url":"https://www.omim.org/entry/609023"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PNKD"},"hgnc":{"alias_symbol":["DYT8","PDC","DKFZp564N1362","FPD1","MR-1","BRP17","FKSG19","TAHCCP2","KIAA1184","KIPP1184","MGC31943","PKND1","MR-1S"],"prev_symbol":[]},"alphafold":{"accession":"Q8N490","domains":[{"cath_id":"3.60.15.10","chopping":"74-292","consensus_level":"high","plddt":95.8619,"start":74,"end":292}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N490","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N490-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N490-F1-predicted_aligned_error_v6.png","plddt_mean":83.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PNKD","jax_strain_url":"https://www.jax.org/strain/search?query=PNKD"},"sequence":{"accession":"Q8N490","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N490.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N490/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N490"}},"corpus_meta":[{"pmid":"16849424","id":"PMC_16849424","title":"Electrically 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effects of chromium(VI) on anaerobic and aerobic growth of Shewanella oneidensis MR-1.","date":"2004","source":"Biotechnology progress","url":"https://pubmed.ncbi.nlm.nih.gov/14763828","citation_count":45,"is_preprint":false},{"pmid":"18948272","id":"PMC_18948272","title":"MR-1 modulates proliferation and migration of human hepatoma HepG2 cells through myosin light chains-2 (MLC2)/focal adhesion kinase (FAK)/Akt signaling pathway.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18948272","citation_count":44,"is_preprint":false},{"pmid":"16038018","id":"PMC_16038018","title":"Global detection and characterization of hypothetical proteins in Shewanella oneidensis MR-1 using LC-MS based proteomics.","date":"2005","source":"Proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/16038018","citation_count":44,"is_preprint":false},{"pmid":"11466298","id":"PMC_11466298","title":"Isolation and characterization of a Shewanella putrefaciens MR-1 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choreoathetosis.","date":"1997","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/9371903","citation_count":24,"is_preprint":false},{"pmid":"35901865","id":"PMC_35901865","title":"Enhancement of hexavalent chromium reduction by Shewanella oneidensis MR-1 in presence of copper nanoparticles via stimulating bacterial extracellular electron transfer and environmental adaptability.","date":"2022","source":"Bioresource technology","url":"https://pubmed.ncbi.nlm.nih.gov/35901865","citation_count":24,"is_preprint":false},{"pmid":"22492434","id":"PMC_22492434","title":"Functional specificity of extracellular nucleases of Shewanella oneidensis MR-1.","date":"2012","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/22492434","citation_count":24,"is_preprint":false},{"pmid":"27997408","id":"PMC_27997408","title":"Effective methods for extracting extracellular polymeric substances from Shewanella oneidensis MR-1.","date":"2016","source":"Water 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systems.","date":"2019","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/31628378","citation_count":24,"is_preprint":false},{"pmid":"36652548","id":"PMC_36652548","title":"A New Electron Shuttling Pathway Mediated by Lipophilic Phenoxazine via the Interaction with Periplasmic and Inner Membrane Proteins of Shewanella oneidensis MR-1.","date":"2023","source":"Environmental science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/36652548","citation_count":23,"is_preprint":false},{"pmid":"30504209","id":"PMC_30504209","title":"Roles of d-Lactate Dehydrogenases in the Anaerobic Growth of Shewanella oneidensis MR-1 on Sugars.","date":"2019","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/30504209","citation_count":23,"is_preprint":false},{"pmid":"26280214","id":"PMC_26280214","title":"Isobutanol production from an engineered Shewanella oneidensis MR-1.","date":"2015","source":"Bioprocess and biosystems engineering","url":"https://pubmed.ncbi.nlm.nih.gov/26280214","citation_count":23,"is_preprint":false},{"pmid":"12889019","id":"PMC_12889019","title":"Modeling chromate reduction in Shewanella oneidensis MR-1: development of a novel dual-enzyme kinetic model.","date":"2003","source":"Biotechnology and bioengineering","url":"https://pubmed.ncbi.nlm.nih.gov/12889019","citation_count":23,"is_preprint":false},{"pmid":"19502394","id":"PMC_19502394","title":"MotX and MotY are required for flagellar rotation in Shewanella oneidensis MR-1.","date":"2009","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/19502394","citation_count":22,"is_preprint":false},{"pmid":"22125549","id":"PMC_22125549","title":"The Response of Shewanella oneidensis MR-1 to Cr(III) Toxicity Differs from that to Cr(VI).","date":"2011","source":"Frontiers in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/22125549","citation_count":22,"is_preprint":false},{"pmid":"29654176","id":"PMC_29654176","title":"Shewanella oneidensis MR-1 Utilizes both Sodium- and Proton-Pumping NADH Dehydrogenases during Aerobic Growth.","date":"2018","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29654176","citation_count":21,"is_preprint":false},{"pmid":"35837844","id":"PMC_35837844","title":"The roles of DmsEFAB and MtrCAB in extracellular reduction of iodate by Shewanella oneidensis MR-1 with lactate as the sole electron donor.","date":"2022","source":"Environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/35837844","citation_count":21,"is_preprint":false},{"pmid":"37148794","id":"PMC_37148794","title":"Effectively facilitating the degradation of chloramphenicol by the synergism of Shewanella oneidensis MR-1 and the metal-organic framework.","date":"2023","source":"Journal of hazardous materials","url":"https://pubmed.ncbi.nlm.nih.gov/37148794","citation_count":21,"is_preprint":false},{"pmid":"22024451","id":"PMC_22024451","title":"Construction and elementary mode analysis of a metabolic model for Shewanella oneidensis MR-1.","date":"2011","source":"Bio Systems","url":"https://pubmed.ncbi.nlm.nih.gov/22024451","citation_count":21,"is_preprint":false},{"pmid":"34699878","id":"PMC_34699878","title":"Biogenic iron sulfide functioning as electron-mediating interface to accelerate dissimilatory ferrihydrite reduction by Shewanella oneidensis MR-1.","date":"2021","source":"Chemosphere","url":"https://pubmed.ncbi.nlm.nih.gov/34699878","citation_count":21,"is_preprint":false},{"pmid":"16632198","id":"PMC_16632198","title":"Myofibrillogenesis regulator 1 gene (MR-1) mutation in an Omani family with paroxysmal nonkinesigenic dyskinesia.","date":"2006","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/16632198","citation_count":20,"is_preprint":false},{"pmid":"38650245","id":"PMC_38650245","title":"Redirection of metabolic flux in Shewanella oneidensis MR-1 by CRISPRi and modular design for 5-aminolevulinic acid production.","date":"2021","source":"Bioresources and bioprocessing","url":"https://pubmed.ncbi.nlm.nih.gov/38650245","citation_count":20,"is_preprint":false},{"pmid":"28070664","id":"PMC_28070664","title":"Transcriptome and metabolome responses of Shewanella oneidensis MR-1 to methyl orange under microaerophilic and aerobic conditions.","date":"2017","source":"Applied microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/28070664","citation_count":20,"is_preprint":false},{"pmid":"30572219","id":"PMC_30572219","title":"Cotransport of biochar and Shewanella oneidensis MR-1 in saturated porous media: Impacts of electrostatic interaction, extracellular electron transfer and microbial taxis.","date":"2018","source":"The Science of the total environment","url":"https://pubmed.ncbi.nlm.nih.gov/30572219","citation_count":20,"is_preprint":false},{"pmid":"27098784","id":"PMC_27098784","title":"Mutation Analysis of MR-1, SLC2A1, and CLCN1 in 28 PRRT2-negative Paroxysmal Kinesigenic Dyskinesia Patients.","date":"2016","source":"Chinese medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/27098784","citation_count":19,"is_preprint":false},{"pmid":"34537699","id":"PMC_34537699","title":"Reduction and removal of Cr(VI) in water using biosynthesized palladium nanoparticles loaded Shewanella oneidensis MR-1.","date":"2021","source":"The Science of the total environment","url":"https://pubmed.ncbi.nlm.nih.gov/34537699","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51573,"output_tokens":2249,"usd":0.094227,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8758,"output_tokens":2362,"usd":0.05142,"stage2_stop_reason":"end_turn"},"total_usd":0.145647,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about the canonical PNKD protein (also known as MR-1/myofibrillogenesis regulator 1, the human gene causing paroxysmal non-kinesigenic dyskinesia).\n\nThe vast majority of papers are about *Shewanella oneidensis* MR-1 (a bacterium) — these are symbol collisions and must be excluded. Papers [42] and [48] describe different \"MR-1\" proteins (an immunotoxin and a different context). \n\nPapers that are clearly about the human PNKD gene:\n- [13] FPD1 maps to chromosome 2q — genetic mapping\n- [40] PNKD mutations and mitochondrial targeting sequence — mechanistic\n- [56] PNKD protein cleavage, stability, redox role — mechanistic\n- [66] PNKD interacts with RIMS1α, oligomerizes — mechanistic\n- [69] MR-1 characterized, interacts with myosin regulatory light chain, myomesin 1, beta-enolase — mechanistic\n- [77] FPD1 locus refined — genetic\n- [95] MR-1 mutations confirmed — genetic/clinical\n- [99] MR-1 mutations in PKD patients — clinical screening\n- [48] MR-1 modulates HepG2 via MLC2/FAK/Akt — mechanistic (this is the PNKD/MR-1 protein in cancer cells)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"The gene responsible for autosomal dominant non-kinesiogenic familial paroxysmal dyskinesia (FPD1/PNKD) was mapped to chromosome 2q31-36 by linkage analysis in a segregating family (LOD score 4.64).\",\n      \"method\": \"Linkage analysis / genetic mapping\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean linkage analysis in a well-characterized family, single study establishing chromosomal locus\",\n      \"pmids\": [\"8659517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MR-1 (PNKD) protein was identified as a myofibrillogenesis regulator in human skeletal muscle; yeast two-hybrid screening and in vitro binding assays showed it interacts with sarcomeric proteins myosin regulatory light chain (MLC2), myomesin 1, and beta-enolase.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro binding assay, Northern blot, immunohistochemistry\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus in vitro binding confirms interaction with multiple partners, single lab\",\n      \"pmids\": [\"15188056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MR-1 (PNKD) overexpression in hepatoma HepG2 cells promotes cell proliferation, migration, and adhesion via phosphorylation of MLC2, FAK, and Akt; siRNA knockdown of MR-1 reduced phosphorylation of MLC2, FAK, and Akt, destroyed stress fiber formation, and inhibited tumor growth in vivo. MLC2 activation and intact actin cytoskeleton were required for MR-1 function.\",\n      \"method\": \"siRNA knockdown, stable transfection, Western blot for phosphorylation, MLCK inhibitor and F-actin polymerization inhibitor treatment, in vivo xenograft\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular/molecular phenotype plus pharmacological inhibitors, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"18948272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PNKD disease-causing mutations (A7V, A9V) reside within a mitochondrial targeting sequence (MTS) of 39 amino acids present in the MR-1L and MR-1S isoforms; these isoforms are imported into mitochondria and inserted into the inner mitochondrial membrane, where the MTS is cleaved. In contrast, mutation-free MR-1M localizes to Golgi, ER, and plasma membrane. A third mutation (A33P) was identified in the same MTS region. Wild-type and mutant proteins showed no difference in import efficiency or protein maturation, suggesting PNKD pathogenesis involves a deleterious action of the MTS itself rather than altered mature protein function.\",\n      \"method\": \"Subcellular fractionation, fluorescence microscopy (live imaging), import assays, mutation identification in new patient\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (fractionation, live imaging, import assays) in a single rigorous study establishing isoform-specific localization and mechanism\",\n      \"pmids\": [\"19124534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The N-terminus of wild-type PNKD-L (long isoform) undergoes a cleavage event in vitro; disease-associated mutations (A7V or A9V) confer resistance to this cleavage. Mutant PNKD-L protein is degraded faster than wild-type, and decreased cortical Pnkd-L levels were observed in mutant transgenic mice. PNKD is homologous to the metallo-beta-lactamase superfamily (highest homology to glyoxalase II) but does not catalyze the glyoxalase II reaction. Lower glutathione levels were found in cortex lysates of Pnkd knockout mice compared to wild-type, implicating PNKD in cellular redox homeostasis.\",\n      \"method\": \"In vitro cleavage assay, protein stability assay in cultured cells, transgenic mouse cortex protein quantification, enzymatic activity assay (glyoxalase II substrate), glutathione measurement in knockout mouse cortex\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (in vitro assay, cell-based stability, transgenic mouse, knockout mouse biochemistry) in single rigorous study\",\n      \"pmids\": [\"21487022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The PNKD long isoform (PNKD-L) self-oligomerizes and physically interacts with the synaptic active zone protein RIMS1α, as demonstrated by co-immunoprecipitation in neurons derived from iPSCs. A nonsense mutation in PNKD causing reduced PNKD-L protein levels (via nonsense-mediated mRNA decay) co-segregated with Tourette Disorder in a multiplex family.\",\n      \"method\": \"iPSC-derived neurons, co-immunoprecipitation, Western blot, whole exome sequencing\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP in disease-relevant cell type (iPSC neurons) demonstrating interaction with RIMS1α and self-oligomerization, single lab\",\n      \"pmids\": [\"28894297\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PNKD (MR-1) encodes a protein with at least three alternatively spliced isoforms: MR-1L and MR-1S contain a mitochondrial targeting sequence (MTS) directing them to the inner mitochondrial membrane, while MR-1M localizes to the Golgi/ER/plasma membrane; the disease-causing A7V, A9V, and A33P mutations all map within the MTS, which normally undergoes cleavage—mutations confer resistance to this cleavage and accelerate protein degradation; PNKD-L is homologous to the metallo-beta-lactamase superfamily, does not catalyze glyoxalase II activity, but loss of PNKD reduces cellular glutathione levels, implicating it in redox homeostasis; PNKD-L self-oligomerizes and interacts with the synaptic active zone scaffold protein RIMS1α, and MR-1 also interacts with sarcomeric proteins (MLC2, myomesin 1, beta-enolase) and promotes cell migration via MLC2/FAK/Akt phosphorylation signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PNKD (MR-1) is the gene whose mutation causes autosomal dominant non-kinesiogenic paroxysmal dyskinesia, originally mapped to chromosome 2q31-36 by family linkage analysis [#0]. The gene produces alternatively spliced isoforms with distinct subcellular fates: the long and short isoforms (MR-1L/MR-1S) carry a 39-amino-acid mitochondrial targeting sequence (MTS) that directs import into the inner mitochondrial membrane where it is cleaved, while the mutation-free MR-1M isoform localizes to Golgi, ER, and plasma membrane [#3]. All identified disease mutations (A7V, A9V, A33P) fall within this MTS; rather than altering mature protein function, the mutations render the N-terminal cleavage site resistant to processing and accelerate degradation of the protein, lowering cortical PNKD-L levels in mutant mice [#3, #4]. PNKD-L is homologous to the metallo-beta-lactamase superfamily but lacks glyoxalase II activity; nonetheless loss of PNKD reduces cellular glutathione, linking it to redox homeostasis [#4]. At the synapse, PNKD-L self-oligomerizes and binds the active zone scaffold RIMS1\\u03b1, and a loss-of-function PNKD variant co-segregates with Tourette Disorder [#5]. Independently, MR-1 interacts with sarcomeric proteins (MLC2, myomesin 1, beta-enolase) and drives cell proliferation, migration, and adhesion through MLC2/FAK/Akt phosphorylation and stress fiber formation [#1, #2].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the chromosomal locus for familial paroxysmal dyskinesia was the first step toward identifying the causative gene.\",\n      \"evidence\": \"Linkage analysis in a segregating family mapping the disorder to 2q31-36 (LOD 4.64)\",\n      \"pmids\": [\"8659517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the gene or causal variant\", \"No molecular function implied\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identifying MR-1 binding partners gave the first clue to a molecular function, placing it in contact with sarcomeric machinery.\",\n      \"evidence\": \"Yeast two-hybrid and in vitro binding assays in skeletal muscle showing interaction with MLC2, myomesin 1, and beta-enolase\",\n      \"pmids\": [\"15188056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interactions not validated in neurons or in vivo\", \"No connection to the dyskinesia phenotype established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Functional assays defined a signaling role for MR-1, showing it actively drives cytoskeletal remodeling and cell motility rather than acting passively.\",\n      \"evidence\": \"siRNA knockdown and overexpression in HepG2 cells with phospho-Western blots, pharmacological inhibitors, and xenograft assays linking MR-1 to MLC2/FAK/Akt phosphorylation and stress fibers\",\n      \"pmids\": [\"18948272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MR-1 activates these kinases unknown\", \"Relevance to neuronal disease unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Resolving isoform-specific localization showed that disease mutations cluster in a mitochondrial targeting sequence, reframing pathogenesis around the MTS rather than the mature protein.\",\n      \"evidence\": \"Subcellular fractionation, live fluorescence imaging, and import assays of MR-1 isoforms plus mutation identification in a new patient\",\n      \"pmids\": [\"19124534\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No difference in import efficiency between wild-type and mutant left the toxic mechanism undefined\", \"Mitochondrial function consequences not measured\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mechanistic dissection showed mutations block N-terminal cleavage and destabilize PNKD-L, and that PNKD loss lowers glutathione, tying the protein to redox balance.\",\n      \"evidence\": \"In vitro cleavage and protein-stability assays, transgenic and knockout mouse cortex biochemistry, glyoxalase II enzymatic assay, and glutathione measurement\",\n      \"pmids\": [\"21487022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The enzymatic/biochemical activity of PNKD-L remains unidentified despite metallo-beta-lactamase homology\", \"How reduced glutathione produces dyskinesia is unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrating PNKD-L oligomerization and binding to the active zone scaffold RIMS1\\u03b1 connected the protein to synaptic machinery and broadened its disease association.\",\n      \"evidence\": \"Co-immunoprecipitation and Western blot in iPSC-derived neurons, plus whole exome sequencing of a Tourette Disorder family\",\n      \"pmids\": [\"28894297\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Co-IP not reciprocally validated or reconstituted\", \"Functional consequence of the RIMS1\\u03b1 interaction at the synapse not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The catalytic activity of PNKD-L and the mechanism linking MTS cleavage, glutathione homeostasis, and synaptic dysfunction to paroxysmal dyskinesia remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No demonstrated enzymatic substrate despite metallo-beta-lactamase homology\", \"Causal chain from protein destabilization to episodic movement disorder not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"RIMS1\", \"MLC2\", \"MYOM1\", \"ENO3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}