{"gene":"MVD","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":2003,"finding":"Mevalonate pyrophosphate decarboxylase (MVD) was identified as a binding partner of mortalin (mot-2/GRP75) through yeast two-hybrid screen and confirmed by in vivo coimmunoprecipitation in mammalian cells. Overexpression of mortalin reduced levels of Ras and phosphorylated ERK2, and co-expression of MVD rescued these effects, establishing a functional link between mortalin, MVD, and the Ras-Raf-MAPK proliferation pathway.","method":"Yeast two-hybrid screen, mammalian two-hybrid assay, coimmunoprecipitation, overexpression rescue experiment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and functional rescue in mammalian cells, single lab with two orthogonal methods","pmids":["12646231"],"is_preprint":false},{"year":2002,"finding":"The MVD gene from Candida albicans was cloned and shown to encode a functional mevalonate diphosphate decarboxylase (catalyzing conversion of mevalonate diphosphate to isopentenyl diphosphate). A single copy of C. albicans MVD complemented an S. cerevisiae temperature-sensitive erg19 (MVD) mutant, demonstrating conserved enzymatic function across species.","method":"Heterologous complementation in S. cerevisiae erg19 temperature-sensitive mutant, Western blot confirmation of expression","journal":"Molecular genetics and genomics","confidence":"Medium","confidence_rationale":"Tier 1 — functional complementation assay demonstrating enzymatic activity, single lab","pmids":["12073030"],"is_preprint":false},{"year":2009,"finding":"Molecular docking and MD simulation of S. cerevisiae MVD identified active site residues involved in substrate binding: Ala15, Lys18, Ser121, and Ser155 interact with mevalonate diphosphate (MDP); Lys22, Ser153, and Ser155 interact with ATP; Tyr19, Ser121, Ser153, Gly154, and Thr209 interact with the inhibitor trifluoromevalonate. A water molecule between Asp302 and the C3 of MDP suggests decarboxylation proceeds via water-mediated deprotonation.","method":"Molecular docking (Hex 4.2) and 1.5 ns MD simulation (GROMACS) of scMVD crystal structure with substrates and inhibitor","journal":"Journal of molecular modeling","confidence":"Low","confidence_rationale":"Tier 4 — computational prediction only, no experimental mutagenesis validation","pmids":["19653015"],"is_preprint":false},{"year":2019,"finding":"Second-hit postzygotic somatic mutations in MVD (in addition to a germline heterozygous splice-site mutation c.70+5G>A) were identified in lesional skin of linear porokeratosis, establishing that biallelic loss of MVD function in keratinocytes, via the two-hit mechanism, underlies porokeratosis development.","method":"Paired whole-exome sequencing of affected skin versus blood/saliva from porokeratosis patients","journal":"JAMA dermatology","confidence":"High","confidence_rationale":"Tier 2 — strong genetic evidence from paired WES with orthogonal Sanger confirmation, replicated across multiple patients and labs","pmids":["30942823"],"is_preprint":false},{"year":2019,"finding":"Each skin lesion of disseminated superficial actinic porokeratosis (DSAP) harbors an individual second-hit in the wild-type allele of MVD (or MVK) specifically in the epidermis, via somatic homologous recombination or C>T transition. This demonstrates that postnatal, clonal biallelic MVD deficiency in keratinocytes is required for porokeratosis lesion formation, consistent with Knudson's two-hit tumor suppressor model.","method":"Targeted sequencing of multiple individual DSAP lesions per patient, clonal analysis, comparison of congenital vs. sporadic cases","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal sequencing methods across multiple lesions and patients, independently replicating the two-hit mechanism for MVD","pmids":["31207227"],"is_preprint":false},{"year":2021,"finding":"MVD expression was localized to spiral ganglion cells in the mouse cochlea by immunohistochemistry, and rare homozygous missense variants in MVD segregated with profound prelingual sensorineural hearing impairment in a consanguineous Pakistani family, supported by linkage analysis and in silico structural analysis predicting conformational changes.","method":"Exome sequencing, Sanger sequencing, linkage analysis, RNAseq expression profiling, immunohistochemistry in mouse cochlear tissue","journal":"European journal of human genetics","confidence":"Low","confidence_rationale":"Tier 3 — genetic association with localization data but no functional rescue or in vitro enzymatic assay; candidate gene status only","pmids":["34135477"],"is_preprint":false},{"year":2021,"finding":"Peripheral blood T-cell subset analysis in porokeratosis patients with MVD variants revealed significantly decreased frequencies of CD8+ and Vγ9Vδ2 T cells compared to normal controls, and dysregulated secretion of pro-inflammatory cytokines (IFN-γ, TNF-α) by T cells, indicating that MVD deficiency affects systemic immune cell populations.","method":"Flow cytometry of PBMCs from patients with MVD variants versus normal controls","journal":"Skin health and disease","confidence":"Low","confidence_rationale":"Tier 3 — single cohort, observational flow cytometry without mechanistic intervention","pmids":["35665211"],"is_preprint":false},{"year":2023,"finding":"A knock-in mouse model carrying MvdF250S/+ (equivalent to the human MVDF249S/+ porokeratosis mutation) showed reduced cutaneous Mvd protein expression. Upon imiquimod-induced skin inflammation, MvdF250S/+ mice exhibited decreased susceptibility with reduced proliferation, lower IL-17a and IL-1β protein levels, downregulated collagen generation, upregulated Fabp3, and activated autophagy, without significant changes in key cholesterol regulation genes.","method":"CRISPR/Cas9 knock-in mouse model, imiquimod skin inflammation model, Western blot, protein level measurement","journal":"Inflammation","confidence":"Medium","confidence_rationale":"Tier 2 — genetically defined KI mouse with specific phenotypic readouts and molecular analysis, single lab","pmids":["37227548"],"is_preprint":false}],"current_model":"MVD (mevalonate diphosphate decarboxylase) catalyzes the ATP-dependent decarboxylation of mevalonate diphosphate to isopentenyl diphosphate in the mevalonate pathway; it physically interacts with mortalin to modulate Ras/ERK signaling and cellular proliferation, and biallelic loss-of-function of MVD in keratinocytes—via germline plus somatic second-hit mutations—drives clonal expansion causing porokeratosis skin lesions, while MVD haploinsufficiency in a knock-in mouse model attenuates inflammatory skin responses and activates autophagy."},"narrative":{"teleology":[{"year":2002,"claim":"Establishing that MVD encodes a bona fide mevalonate diphosphate decarboxylase: heterologous expression of C. albicans MVD complemented the S. cerevisiae erg19 temperature-sensitive mutant, demonstrating conserved catalytic function in the mevalonate pathway across species.","evidence":"Functional complementation of yeast erg19 mutant by C. albicans MVD cDNA","pmids":["12073030"],"confidence":"Medium","gaps":["No direct biochemical kinetics or substrate specificity determined for the human enzyme","No crystal structure of the human MVD at this point"]},{"year":2003,"claim":"Connecting MVD to a non-canonical signaling role: identification of mortalin as a physical interactor revealed that MVD can modulate Ras/ERK signaling beyond its metabolic enzyme function, as co-expression of MVD rescued mortalin-mediated suppression of Ras and phospho-ERK2.","evidence":"Yeast two-hybrid screen, mammalian co-immunoprecipitation, overexpression rescue of Ras/ERK levels","pmids":["12646231"],"confidence":"Medium","gaps":["Reciprocal endogenous Co-IP not shown; interaction awaits confirmation at endogenous levels","Whether the MVD–mortalin interaction requires enzymatic activity or is a scaffolding function is unknown","No in vivo validation of the Ras/ERK modulation"]},{"year":2009,"claim":"Computational modeling of the yeast MVD active site proposed a water-mediated deprotonation mechanism for decarboxylation and identified candidate substrate-binding and ATP-binding residues, providing a structural framework for future mutagenesis.","evidence":"Molecular docking and MD simulation of S. cerevisiae MVD crystal structure","pmids":["19653015"],"confidence":"Low","gaps":["Purely computational; no experimental mutagenesis validation of predicted residues","Simulations used yeast enzyme; relevance to human MVD active-site geometry unconfirmed","No inhibitor potency data generated"]},{"year":2019,"claim":"Demonstrating that biallelic MVD loss causes porokeratosis: paired exome sequencing of lesional versus non-lesional tissue revealed germline heterozygous MVD mutations combined with somatic second-hit events in each lesion, establishing a two-hit tumor-suppressor-like mechanism for clonal keratinocyte expansion.","evidence":"Whole-exome sequencing of paired lesional skin and blood/saliva in multiple porokeratosis patients, independently confirmed by targeted sequencing of individual DSAP lesions","pmids":["30942823","31207227"],"confidence":"High","gaps":["The specific downstream metabolite or signaling deficiency (isoprenoid depletion vs. mevalonate accumulation) driving lesion formation is not resolved","Whether restoring MVD activity can reverse established lesions is untested"]},{"year":2021,"claim":"Extending MVD deficiency phenotypes: a homozygous missense MVD variant segregated with profound prelingual sensorineural hearing loss in a consanguineous family, and MVD protein was localized to spiral ganglion cells in the mouse cochlea, suggesting a role in auditory neuron function.","evidence":"Exome sequencing with linkage analysis in a Pakistani family; immunohistochemistry in mouse cochlea","pmids":["34135477"],"confidence":"Low","gaps":["No functional rescue or enzymatic assay performed for the candidate variant; remains a candidate gene association","Whether hearing loss reflects isoprenoid pathway disruption in spiral ganglion neurons is unknown","No replication cohort"]},{"year":2023,"claim":"A genetically defined knock-in mouse (MvdF250S/+) revealed that MVD haploinsufficiency attenuates imiquimod-induced skin inflammation—reducing IL-17a, IL-1β, and proliferation while activating autophagy—providing in vivo mechanistic evidence that partial MVD loss alters inflammatory and autophagic responses in skin.","evidence":"CRISPR/Cas9 knock-in heterozygous mouse model with imiquimod challenge, Western blot and cytokine profiling","pmids":["37227548"],"confidence":"Medium","gaps":["Autophagy activation mechanism (mTOR inhibition vs. isoprenoid depletion) not delineated","Homozygous knock-in or conditional keratinocyte knockout not reported","Whether Fabp3 upregulation is a direct metabolic compensation remains uncharacterized"]},{"year":null,"claim":"The precise downstream metabolic deficiency (isopentenyl diphosphate depletion, toxic mevalonate accumulation, or specific isoprenoid shortage) that triggers keratinocyte clonal expansion in porokeratosis and the structural basis of human MVD catalysis remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal structure of human MVD","No metabolomic profiling of MVD-deficient keratinocytes","Whether the MVD–mortalin interaction is physiologically relevant in skin or immune cells is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016829","term_label":"lyase activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1,2]}],"localization":[],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4]}],"complexes":[],"partners":["HSPA9"],"other_free_text":[]},"mechanistic_narrative":"MVD encodes mevalonate diphosphate decarboxylase, which catalyzes the ATP-dependent decarboxylation of mevalonate diphosphate to isopentenyl diphosphate in the mevalonate/isoprenoid biosynthetic pathway, a function conserved from yeast to mammals [PMID:12073030]. MVD physically interacts with mortalin (GRP75), and co-expression of MVD rescues mortalin-induced suppression of Ras and phospho-ERK2 levels, linking MVD to modulation of the Ras-Raf-MAPK proliferation pathway [PMID:12646231]. Biallelic loss-of-function of MVD in keratinocytes—through germline heterozygous mutations combined with somatic second-hit events—drives clonal epidermal expansion causing porokeratosis, while MVD haploinsufficiency in a knock-in mouse model attenuates inflammatory skin responses and activates autophagy [PMID:30942823, PMID:31207227, PMID:37227548]."},"prefetch_data":{"uniprot":{"accession":"P53602","full_name":"Diphosphomevalonate decarboxylase","aliases":["Mevalonate (diphospho)decarboxylase","MDDase","Mevalonate pyrophosphate decarboxylase"],"length_aa":400,"mass_kda":43.4,"function":"Catalyzes the ATP dependent decarboxylation of (R)-5-diphosphomevalonate to form isopentenyl diphosphate (IPP). Functions in the mevalonate (MVA) pathway leading to isopentenyl diphosphate (IPP), a key precursor for the biosynthesis of isoprenoids and sterol synthesis","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P53602/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/MVD","classification":"Common Essential","n_dependent_lines":886,"n_total_lines":1208,"dependency_fraction":0.7334437086092715},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000167508","cell_line_id":"CID000276","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":2},{"compartment":"big_aggregates","grade":1}],"interactors":[{"gene":"GLT8D1","stoichiometry":0.2},{"gene":"NSDHL","stoichiometry":0.2},{"gene":"ZNF554","stoichiometry":0.2},{"gene":"ACVR2B","stoichiometry":0.2},{"gene":"TTLL5","stoichiometry":0.2},{"gene":"FASN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000276","total_profiled":1310},"omim":[{"mim_id":"614714","title":"POROKERATOSIS 7, MULTIPLE TYPES; POROK7","url":"https://www.omim.org/entry/614714"},{"mim_id":"613457","title":"CHROMOSOME 14q11-q22 DELETION SYNDROME","url":"https://www.omim.org/entry/613457"},{"mim_id":"603236","title":"MEVALONATE PYROPHOSPHATE DECARBOXYLASE; MVD","url":"https://www.omim.org/entry/603236"},{"mim_id":"251170","title":"MEVALONATE KINASE; MVK","url":"https://www.omim.org/entry/251170"},{"mim_id":"175900","title":"POROKERATOSIS 3, MULTIPLE TYPES; POROK3","url":"https://www.omim.org/entry/175900"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MVD"},"hgnc":{"alias_symbol":["MPD"],"prev_symbol":[]},"alphafold":{"accession":"P53602","domains":[{"cath_id":"3.30.230.10","chopping":"9-189_381-388","consensus_level":"high","plddt":90.9543,"start":9,"end":388},{"cath_id":"3.30.70.890","chopping":"196-375","consensus_level":"high","plddt":94.236,"start":196,"end":375}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P53602","model_url":"https://alphafold.ebi.ac.uk/files/AF-P53602-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P53602-F1-predicted_aligned_error_v6.png","plddt_mean":92.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MVD","jax_strain_url":"https://www.jax.org/strain/search?query=MVD"},"sequence":{"accession":"P53602","fasta_url":"https://rest.uniprot.org/uniprotkb/P53602.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P53602/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P53602"}},"corpus_meta":[{"pmid":"18160670","id":"PMC_18160670","title":"Ratio 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Yi xue ban = Journal of Central South University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19734574","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52494,"output_tokens":2084,"usd":0.094371},"stage2":{"model":"claude-opus-4-6","input_tokens":5373,"output_tokens":1918,"usd":0.112223},"total_usd":0.206594,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"Mevalonate pyrophosphate decarboxylase (MVD) was identified as a binding partner of mortalin (mot-2/GRP75) through yeast two-hybrid screen and confirmed by in vivo coimmunoprecipitation in mammalian cells. Overexpression of mortalin reduced levels of Ras and phosphorylated ERK2, and co-expression of MVD rescued these effects, establishing a functional link between mortalin, MVD, and the Ras-Raf-MAPK proliferation pathway.\",\n      \"method\": \"Yeast two-hybrid screen, mammalian two-hybrid assay, coimmunoprecipitation, overexpression rescue experiment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and functional rescue in mammalian cells, single lab with two orthogonal methods\",\n      \"pmids\": [\"12646231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The MVD gene from Candida albicans was cloned and shown to encode a functional mevalonate diphosphate decarboxylase (catalyzing conversion of mevalonate diphosphate to isopentenyl diphosphate). A single copy of C. albicans MVD complemented an S. cerevisiae temperature-sensitive erg19 (MVD) mutant, demonstrating conserved enzymatic function across species.\",\n      \"method\": \"Heterologous complementation in S. cerevisiae erg19 temperature-sensitive mutant, Western blot confirmation of expression\",\n      \"journal\": \"Molecular genetics and genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — functional complementation assay demonstrating enzymatic activity, single lab\",\n      \"pmids\": [\"12073030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Molecular docking and MD simulation of S. cerevisiae MVD identified active site residues involved in substrate binding: Ala15, Lys18, Ser121, and Ser155 interact with mevalonate diphosphate (MDP); Lys22, Ser153, and Ser155 interact with ATP; Tyr19, Ser121, Ser153, Gly154, and Thr209 interact with the inhibitor trifluoromevalonate. A water molecule between Asp302 and the C3 of MDP suggests decarboxylation proceeds via water-mediated deprotonation.\",\n      \"method\": \"Molecular docking (Hex 4.2) and 1.5 ns MD simulation (GROMACS) of scMVD crystal structure with substrates and inhibitor\",\n      \"journal\": \"Journal of molecular modeling\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational prediction only, no experimental mutagenesis validation\",\n      \"pmids\": [\"19653015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Second-hit postzygotic somatic mutations in MVD (in addition to a germline heterozygous splice-site mutation c.70+5G>A) were identified in lesional skin of linear porokeratosis, establishing that biallelic loss of MVD function in keratinocytes, via the two-hit mechanism, underlies porokeratosis development.\",\n      \"method\": \"Paired whole-exome sequencing of affected skin versus blood/saliva from porokeratosis patients\",\n      \"journal\": \"JAMA dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — strong genetic evidence from paired WES with orthogonal Sanger confirmation, replicated across multiple patients and labs\",\n      \"pmids\": [\"30942823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Each skin lesion of disseminated superficial actinic porokeratosis (DSAP) harbors an individual second-hit in the wild-type allele of MVD (or MVK) specifically in the epidermis, via somatic homologous recombination or C>T transition. This demonstrates that postnatal, clonal biallelic MVD deficiency in keratinocytes is required for porokeratosis lesion formation, consistent with Knudson's two-hit tumor suppressor model.\",\n      \"method\": \"Targeted sequencing of multiple individual DSAP lesions per patient, clonal analysis, comparison of congenital vs. sporadic cases\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal sequencing methods across multiple lesions and patients, independently replicating the two-hit mechanism for MVD\",\n      \"pmids\": [\"31207227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MVD expression was localized to spiral ganglion cells in the mouse cochlea by immunohistochemistry, and rare homozygous missense variants in MVD segregated with profound prelingual sensorineural hearing impairment in a consanguineous Pakistani family, supported by linkage analysis and in silico structural analysis predicting conformational changes.\",\n      \"method\": \"Exome sequencing, Sanger sequencing, linkage analysis, RNAseq expression profiling, immunohistochemistry in mouse cochlear tissue\",\n      \"journal\": \"European journal of human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — genetic association with localization data but no functional rescue or in vitro enzymatic assay; candidate gene status only\",\n      \"pmids\": [\"34135477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Peripheral blood T-cell subset analysis in porokeratosis patients with MVD variants revealed significantly decreased frequencies of CD8+ and Vγ9Vδ2 T cells compared to normal controls, and dysregulated secretion of pro-inflammatory cytokines (IFN-γ, TNF-α) by T cells, indicating that MVD deficiency affects systemic immune cell populations.\",\n      \"method\": \"Flow cytometry of PBMCs from patients with MVD variants versus normal controls\",\n      \"journal\": \"Skin health and disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single cohort, observational flow cytometry without mechanistic intervention\",\n      \"pmids\": [\"35665211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A knock-in mouse model carrying MvdF250S/+ (equivalent to the human MVDF249S/+ porokeratosis mutation) showed reduced cutaneous Mvd protein expression. Upon imiquimod-induced skin inflammation, MvdF250S/+ mice exhibited decreased susceptibility with reduced proliferation, lower IL-17a and IL-1β protein levels, downregulated collagen generation, upregulated Fabp3, and activated autophagy, without significant changes in key cholesterol regulation genes.\",\n      \"method\": \"CRISPR/Cas9 knock-in mouse model, imiquimod skin inflammation model, Western blot, protein level measurement\",\n      \"journal\": \"Inflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetically defined KI mouse with specific phenotypic readouts and molecular analysis, single lab\",\n      \"pmids\": [\"37227548\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MVD (mevalonate diphosphate decarboxylase) catalyzes the ATP-dependent decarboxylation of mevalonate diphosphate to isopentenyl diphosphate in the mevalonate pathway; it physically interacts with mortalin to modulate Ras/ERK signaling and cellular proliferation, and biallelic loss-of-function of MVD in keratinocytes—via germline plus somatic second-hit mutations—drives clonal expansion causing porokeratosis skin lesions, while MVD haploinsufficiency in a knock-in mouse model attenuates inflammatory skin responses and activates autophagy.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MVD encodes mevalonate diphosphate decarboxylase, which catalyzes the ATP-dependent decarboxylation of mevalonate diphosphate to isopentenyl diphosphate in the mevalonate/isoprenoid biosynthetic pathway, a function conserved from yeast to mammals [PMID:12073030]. MVD physically interacts with mortalin (GRP75), and co-expression of MVD rescues mortalin-induced suppression of Ras and phospho-ERK2 levels, linking MVD to modulation of the Ras-Raf-MAPK proliferation pathway [PMID:12646231]. Biallelic loss-of-function of MVD in keratinocytes—through germline heterozygous mutations combined with somatic second-hit events—drives clonal epidermal expansion causing porokeratosis, while MVD haploinsufficiency in a knock-in mouse model attenuates inflammatory skin responses and activates autophagy [PMID:30942823, PMID:31207227, PMID:37227548].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that MVD encodes a bona fide mevalonate diphosphate decarboxylase: heterologous expression of C. albicans MVD complemented the S. cerevisiae erg19 temperature-sensitive mutant, demonstrating conserved catalytic function in the mevalonate pathway across species.\",\n      \"evidence\": \"Functional complementation of yeast erg19 mutant by C. albicans MVD cDNA\",\n      \"pmids\": [\"12073030\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct biochemical kinetics or substrate specificity determined for the human enzyme\",\n        \"No crystal structure of the human MVD at this point\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connecting MVD to a non-canonical signaling role: identification of mortalin as a physical interactor revealed that MVD can modulate Ras/ERK signaling beyond its metabolic enzyme function, as co-expression of MVD rescued mortalin-mediated suppression of Ras and phospho-ERK2.\",\n      \"evidence\": \"Yeast two-hybrid screen, mammalian co-immunoprecipitation, overexpression rescue of Ras/ERK levels\",\n      \"pmids\": [\"12646231\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Reciprocal endogenous Co-IP not shown; interaction awaits confirmation at endogenous levels\",\n        \"Whether the MVD–mortalin interaction requires enzymatic activity or is a scaffolding function is unknown\",\n        \"No in vivo validation of the Ras/ERK modulation\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Computational modeling of the yeast MVD active site proposed a water-mediated deprotonation mechanism for decarboxylation and identified candidate substrate-binding and ATP-binding residues, providing a structural framework for future mutagenesis.\",\n      \"evidence\": \"Molecular docking and MD simulation of S. cerevisiae MVD crystal structure\",\n      \"pmids\": [\"19653015\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Purely computational; no experimental mutagenesis validation of predicted residues\",\n        \"Simulations used yeast enzyme; relevance to human MVD active-site geometry unconfirmed\",\n        \"No inhibitor potency data generated\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrating that biallelic MVD loss causes porokeratosis: paired exome sequencing of lesional versus non-lesional tissue revealed germline heterozygous MVD mutations combined with somatic second-hit events in each lesion, establishing a two-hit tumor-suppressor-like mechanism for clonal keratinocyte expansion.\",\n      \"evidence\": \"Whole-exome sequencing of paired lesional skin and blood/saliva in multiple porokeratosis patients, independently confirmed by targeted sequencing of individual DSAP lesions\",\n      \"pmids\": [\"30942823\", \"31207227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The specific downstream metabolite or signaling deficiency (isoprenoid depletion vs. mevalonate accumulation) driving lesion formation is not resolved\",\n        \"Whether restoring MVD activity can reverse established lesions is untested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extending MVD deficiency phenotypes: a homozygous missense MVD variant segregated with profound prelingual sensorineural hearing loss in a consanguineous family, and MVD protein was localized to spiral ganglion cells in the mouse cochlea, suggesting a role in auditory neuron function.\",\n      \"evidence\": \"Exome sequencing with linkage analysis in a Pakistani family; immunohistochemistry in mouse cochlea\",\n      \"pmids\": [\"34135477\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No functional rescue or enzymatic assay performed for the candidate variant; remains a candidate gene association\",\n        \"Whether hearing loss reflects isoprenoid pathway disruption in spiral ganglion neurons is unknown\",\n        \"No replication cohort\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A genetically defined knock-in mouse (MvdF250S/+) revealed that MVD haploinsufficiency attenuates imiquimod-induced skin inflammation—reducing IL-17a, IL-1β, and proliferation while activating autophagy—providing in vivo mechanistic evidence that partial MVD loss alters inflammatory and autophagic responses in skin.\",\n      \"evidence\": \"CRISPR/Cas9 knock-in heterozygous mouse model with imiquimod challenge, Western blot and cytokine profiling\",\n      \"pmids\": [\"37227548\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Autophagy activation mechanism (mTOR inhibition vs. isoprenoid depletion) not delineated\",\n        \"Homozygous knock-in or conditional keratinocyte knockout not reported\",\n        \"Whether Fabp3 upregulation is a direct metabolic compensation remains uncharacterized\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The precise downstream metabolic deficiency (isopentenyl diphosphate depletion, toxic mevalonate accumulation, or specific isoprenoid shortage) that triggers keratinocyte clonal expansion in porokeratosis and the structural basis of human MVD catalysis remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal structure of human MVD\",\n        \"No metabolomic profiling of MVD-deficient keratinocytes\",\n        \"Whether the MVD–mortalin interaction is physiologically relevant in skin or immune cells is untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016829\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HSPA9\"],\n    \"other_free_text\": []\n  }\n}\n```"}