{"gene":"PRNP","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2004,"finding":"Expression of human PrP with methionine at codon 129 (Met129) is required for generation of the vCJD phenotype in transgenic mice after BSE prion infection; expression of PrP with valine 129 (Val129) results in a distinct phenotype and persistence of a transmission barrier on subpassage, demonstrating that polymorphic residue 129 dictates propagation of distinct prion strains.","method":"Transgenic mouse model expressing human PrP Met129 or Val129; prion transmission/subpassage experiments","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean transgenic mouse loss-of-function/gain-of-function with defined phenotypic readout, replicated across multiple passage experiments in a single rigorous study","pmids":["15539564"],"is_preprint":false},{"year":1998,"finding":"Gene-targeted modification of the endogenous Prnp allele to express PrP B (codon 108F and 189V) instead of PrP A dramatically shortened scrapie incubation times after challenge with mouse-adapted BSE, demonstrating that PrP dimorphisms at codons 108 and/or 189 control incubation time and that Sinc/Prni and Prnp loci are congruent.","method":"Gene targeting / knock-in mouse; challenge with mouse-adapted BSE strain; incubation time measurement","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct gene-targeting epistasis experiment with defined phenotypic readout, mechanistically linking specific PrP residues to scrapie incubation time","pmids":["9462739"],"is_preprint":false},{"year":1994,"finding":"The combination of the D178N pathogenic mutation with Met129 on the mutant PRNP allele causes Fatal Familial Insomnia, whereas D178N with Val129 causes familial CJD, demonstrating that a polymorphism at codon 129 on the mutant allele determines the distinct disease phenotype produced by the same pathogenic mutation.","method":"Genetic analysis of PRNP haplotypes in affected pedigrees; co-segregation of codon 129 polymorphism with disease phenotype","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic co-segregation analysis in multiple families establishing mechanistic link between codon 129 polymorphism and phenotypic outcome of D178N mutation; single method but replicated across pedigrees","pmids":["7999319"],"is_preprint":false},{"year":2016,"finding":"PRNP regulates exosome secretion by suppressing CAV1-dependent autophagy; specifically, the PRNP octapeptide repeat domain impairs formation of the CAV1-ATG12-ATG5 cytoplasmic complex that drives autophagosome formation, thereby protecting multivesicular bodies from sequestration and facilitating exosome release.","method":"Primary cultures from prnp-null mice; PRNP reconstitution; BECN1 depletion; Western blot for CAV1, ATG12-ATG5 complex; MVB and autophagosome quantification by electron microscopy/immunofluorescence","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods in single lab (KO rescue, domain deletion, autophagy inhibition, complex detection), establishes pathway mechanism","pmids":["27629560"],"is_preprint":false},{"year":2011,"finding":"The PRNP locus encodes a second polypeptide, AltPrP, translated from a downstream AUG codon in the +3 reading frame; AltPrP is constitutively co-expressed with PrP in human, bovine, sheep, and deer cells, localizes to mitochondria, and is up-regulated by ER stress and proteasomal inhibition.","method":"HA-tag insertion in +3 ORF; anti-HA immunoblot; siRNA knockdown of PrP mRNA confirming co-repression of AltPrP; subcellular fractionation/immunofluorescence for mitochondrial localization; detection in human brain homogenate and PBMCs","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (tag expression, siRNA co-knockdown, endogenous antibody detection, stress induction) in a single study establishing a novel translation product and its localization","pmids":["21478263"],"is_preprint":false},{"year":2013,"finding":"IGF-1 enhances PRNP expression through PI3K-Akt signaling, which phosphorylates transcription factor FOXO3a, causing its translocation from nucleus to cytoplasm and relieving its repression of the PRNP promoter; conversely, PI3K-Akt inhibition with LY294002 causes FOXO3a nuclear retention and decreased PRNP expression.","method":"Reporter gene assay; ChIP showing FOXO3a binding to PRNP promoter; pharmacological PI3K-Akt inhibition; nuclear/cytoplasmic fractionation; RT-PCR and Western blot for PRNP mRNA and protein","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, reporter assay, pharmacological inhibition, subcellular fractionation) in single lab establishing transcriptional regulatory mechanism","pmids":["23967259"],"is_preprint":false},{"year":2005,"finding":"Bovine PRNP promoter polymorphisms (23-bp and 12-bp indels containing RP58-binding and SP1-binding sites, respectively) modulate PRNP expression; band shift assays showed differential transcription factor binding, reporter gene assays showed lower expression of the ins/ins allele vs. del/del, and in vivo mRNA measurements confirmed genotype-dependent expression differences in intestinal lymph nodes.","method":"Reporter gene assays; electrophoretic mobility shift assays (EMSA); in vivo PRNP mRNA quantification in calves of different genotypes","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro functional promoter assay combined with in vivo mRNA quantification and EMSA, multiple methods in single study","pmids":["16141216"],"is_preprint":false},{"year":2008,"finding":"Prnp knockdown in neuroblastoma cells using dual miRNA targeting (N- and C-termini simultaneously) caused increased transcript abundance of Plk3, Ppp2r2b, Csnk2a1, and 670460F02Rik, genes involved in cell proliferation and mitochondrial-mediated apoptosis, linking PrPC depletion to altered proliferation and apoptosis pathways.","method":"Dual-targeting miRNA (miRdual) construct; gene expression profiling; cell proliferation, viability and apoptosis assays in PrPC-depleted neuroblastoma cells","journal":"Prion","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, knockdown phenotype with gene expression changes but no direct mechanistic pathway validation beyond correlation","pmids":["21494092"],"is_preprint":false},{"year":2023,"finding":"RBMS1 promotes PRNP translation, leading to increased PrP expression that confers ferroptosis resistance in colorectal cancer cells and contributes to oxaliplatin chemoresistance; inhibition of RBMS1 caused ferroptosis and restored oxaliplatin sensitivity.","method":"Bioinformatics analysis; in vitro knockdown/overexpression experiments; in vivo mouse xenograft models; mechanistic link between RBMS1, PRNP translation, and ferroptosis markers","journal":"Molecular carcinogenesis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional studies establish RBMS1-PRNP-ferroptosis axis but translational mechanism not directly validated (e.g., no polysome profiling or direct reconstitution)","pmids":["37861356"],"is_preprint":false},{"year":2025,"finding":"miR-193b-3p directly targets the 3'-UTR of PRNP to suppress PrPc expression and inhibit lung cancer cell migration and invasion; c-Jun acts as a transcriptional repressor of miR-193b-3p, such that c-Jun activity upregulates PRNP through relief of miR-193b-3p-mediated repression.","method":"Dual-luciferase reporter assay (miRNA-3'UTR interaction); RNA immunoprecipitation (RIP); ChIP assay (c-Jun binding to miR-193b-3p promoter); transwell migration/invasion assays; Western blot; RT-PCR; in vivo xenograft models","journal":"Journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (luciferase reporter, RIP, ChIP, rescue experiments, in vivo) in single study establishing post-transcriptional regulatory mechanism for PRNP","pmids":["39972491"],"is_preprint":false},{"year":2008,"finding":"In Ngsk Prnp-deficient mice, ectopic expression of Doppel (Dpl) in cerebellar Purkinje cells triggers both autophagy and apoptosis; autophagic markers LC3B, p62, and Scrg1 accumulate at the protein but not mRNA level, and autophagic-like profiles accumulate in somatodendritic and axonal compartments, suggesting impaired autophagic flux. This demonstrates that PrP normally protects against Dpl-induced autophagy/apoptosis in Purkinje cells.","method":"Western blotting and immunohistofluorescence for autophagy markers; RT-PCR; ultrastructural electron microscopy; comparison of Prnp-null vs. wild-type mice","journal":"Brain pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (biochemical, morphological, ultrastructural) in Prnp-null model establishing protective role of PrP against Dpl-induced autophagy/apoptosis","pmids":["19055638"],"is_preprint":false},{"year":2004,"finding":"Prnp mRNA is expressed in mouse spermatogenic cells (spermatogonia, spermatocytes, and round spermatids) but not in somatic testicular cells (Sertoli, Leydig, peritubular myoid) or elongated spermatids/spermatozoa, suggesting a role for PrP in germ cell differentiation during spermatogenesis.","method":"Northern blot analysis of Prnp transcripts in testes at multiple developmental time points; in situ hybridization on testis sections","journal":"The Journal of reproduction and development","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by in situ hybridization without direct functional consequence established","pmids":["15514463"],"is_preprint":false}],"current_model":"PRNP encodes the cellular prion protein (PrPC), a GPI-anchored cell-surface glycoprotein whose codon 129 Met/Val polymorphism dictates prion strain propagation and disease phenotype (including modulating the outcome of pathogenic mutations such as D178N); PrPC promotes exosome secretion by suppressing CAV1-dependent autophagy via its octapeptide repeat domain, is transcriptionally regulated by an IGF-1–PI3K–Akt–FOXO3a axis, is post-transcriptionally repressed by miR-193b-3p (itself controlled by c-Jun), and is translationally induced by RBMS1 to confer ferroptosis resistance; additionally, the locus encodes a second mitochondrially-localized polypeptide (AltPrP) from a +3 reading-frame AUG, and promoter polymorphisms control PrP expression levels that influence prion disease susceptibility."},"narrative":{"mechanistic_narrative":"PRNP encodes the cellular prion protein (PrPC), whose codon 129 Met/Val polymorphism acts as a principal determinant of prion strain propagation and disease phenotype: human PrP with Met129 is required to generate the vCJD phenotype after BSE infection, while Val129 propagates a distinct strain and maintains a transmission barrier [PMID:15539564], and the same codon 129 polymorphism cis to the pathogenic D178N mutation dictates whether the resulting disease is Fatal Familial Insomnia (Met129) or familial CJD (Val129) [PMID:7999319]. PrP dimorphisms also govern disease kinetics, as gene-targeted substitution of mouse PrP residues at codons 108/189 dramatically alters scrapie incubation time and maps the Sinc/Prni locus to Prnp [PMID:9462739]. Beyond prion biology, PrPC functions in cellular trafficking and survival pathways: its octapeptide repeat domain suppresses CAV1-dependent autophagy by impairing assembly of the CAV1-ATG12-ATG5 complex, thereby protecting multivesicular bodies and promoting exosome release [PMID:27629560], and PrP protects cerebellar Purkinje cells against Doppel-induced autophagy and apoptosis [PMID:19055638]. PrP expression is controlled at multiple levels — transcriptionally through an IGF-1–PI3K–Akt axis that phosphorylates and exports the repressor FOXO3a from the PRNP promoter [PMID:23967259], through promoter indel polymorphisms altering transcription-factor binding [PMID:16141216], and post-transcriptionally via direct miR-193b-3p targeting of the 3'-UTR, itself under c-Jun control [PMID:39972491]. The locus additionally encodes AltPrP, a mitochondrially-localized polypeptide translated from a +3 reading-frame AUG and induced by ER stress [PMID:21478263].","teleology":[{"year":1994,"claim":"Established that a single coding polymorphism can redirect the phenotypic outcome of a fixed pathogenic mutation, answering why identical D178N mutations cause two distinct diseases.","evidence":"Genetic haplotype analysis and codon 129 co-segregation across affected pedigrees","pmids":["7999319"],"confidence":"Medium","gaps":["Does not establish the molecular basis by which the codon 129 residue alters misfolding conformation","Single genetic method without biochemical reconstitution"]},{"year":1998,"claim":"Demonstrated that specific PrP residues, not a separate locus, control scrapie incubation time, resolving the congruence of Sinc/Prni with Prnp.","evidence":"Gene-targeted knock-in of PrP codon 108/189 variants challenged with mouse-adapted BSE","pmids":["9462739"],"confidence":"High","gaps":["Mechanism linking residues 108/189 to conversion kinetics not defined","Restricted to mouse-adapted BSE strain"]},{"year":2004,"claim":"Showed that codon 129 genotype dictates which prion strain propagates and whether a transmission barrier persists, establishing the polymorphism as a strain-selection determinant.","evidence":"Transgenic mice expressing human PrP Met129 or Val129 with BSE transmission and subpassage","pmids":["15539564"],"confidence":"High","gaps":["Structural basis of strain selection by residue 129 unresolved","Does not address host factors beyond PrP sequence"]},{"year":2004,"claim":"Mapped Prnp expression to specific germ cell stages, raising a candidate role in spermatogenesis.","evidence":"Northern blot and in situ hybridization across testicular cell types and developmental time points","pmids":["15514463"],"confidence":"Low","gaps":["Localization only — no functional consequence for fertility or germ cell differentiation established","No protein-level confirmation"]},{"year":2005,"claim":"Identified that promoter indel polymorphisms set basal PrP expression levels via differential transcription-factor binding, linking regulatory variation to disease susceptibility.","evidence":"Reporter assays, EMSA, and in vivo mRNA quantification across bovine genotypes","pmids":["16141216"],"confidence":"Medium","gaps":["Identity of functional transcription factors at the indels inferred from binding sites","Human relevance not directly tested"]},{"year":2008,"claim":"Provided evidence that PrP normally protects neurons against Doppel-induced autophagy and apoptosis, connecting PrP loss to neurodegeneration in Purkinje cells.","evidence":"Autophagy/apoptosis markers and ultrastructure in Ngsk Prnp-null vs. wild-type cerebellum","pmids":["19055638"],"confidence":"Medium","gaps":["Mechanism by which PrP antagonizes Dpl toxicity not defined","Specific to Purkinje cell context"]},{"year":2008,"claim":"Linked PrPC depletion to altered transcription of proliferation and mitochondrial apoptosis genes, hinting at a survival-regulatory role.","evidence":"Dual-targeting miRNA knockdown with expression profiling and viability assays in neuroblastoma cells","pmids":["21494092"],"confidence":"Low","gaps":["Correlative transcript changes without validated mechanistic pathway","Off-target effects of dual miRNA not excluded"]},{"year":2011,"claim":"Revealed that the PRNP locus is bicistronic, encoding a mitochondrial polypeptide AltPrP from an alternate reading frame, expanding the locus's coding capacity.","evidence":"HA-tag insertion in +3 ORF, siRNA co-knockdown, endogenous antibody detection, and fractionation across multiple species","pmids":["21478263"],"confidence":"Medium","gaps":["Function of AltPrP at mitochondria unknown","Role in prion disease not established"]},{"year":2013,"claim":"Defined an IGF-1–PI3K–Akt–FOXO3a transcriptional axis controlling PRNP expression, identifying an upstream signaling input.","evidence":"Reporter assay, ChIP for FOXO3a promoter binding, pharmacological PI3K inhibition, and subcellular fractionation","pmids":["23967259"],"confidence":"Medium","gaps":["Physiological contexts engaging this axis not mapped","FOXO3a co-regulators at the promoter not identified"]},{"year":2016,"claim":"Established a non-prion cellular function: the PrP octapeptide repeat domain suppresses CAV1-dependent autophagy to promote exosome secretion.","evidence":"Prnp-null rescue, domain deletion, autophagy inhibition, and CAV1-ATG12-ATG5 complex detection with EM/IF quantification","pmids":["27629560"],"confidence":"Medium","gaps":["Direct binding of octapeptide repeats to complex components not demonstrated","Single-lab finding"]},{"year":2023,"claim":"Implicated RBMS1-driven PRNP translation in ferroptosis resistance and chemoresistance, extending PrP function to cancer cell survival.","evidence":"Knockdown/overexpression, xenografts, and ferroptosis marker analysis in colorectal cancer cells","pmids":["37861356"],"confidence":"Low","gaps":["Translational mechanism not directly validated (no polysome profiling or reconstitution)","Direct RBMS1-PRNP mRNA interaction not shown"]},{"year":2025,"claim":"Defined a c-Jun–miR-193b-3p axis post-transcriptionally controlling PRNP, linking PrP to lung cancer cell migration and invasion.","evidence":"Luciferase 3'-UTR reporter, RIP, c-Jun ChIP, rescue, and xenograft assays","pmids":["39972491"],"confidence":"Medium","gaps":["Downstream effectors of PrP in invasion not defined","Single-study mechanism"]},{"year":null,"claim":"How PrPC's normal cellular functions (exosome/autophagy regulation, survival signaling) mechanistically relate to its conversion into pathogenic prions and to codon 129/108/189-dictated strain selection remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model linking polymorphic residues to strain conformation","Connection between physiological PrP functions and conversion mechanism unestablished","Role of AltPrP in disease unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,10]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,10]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,10]}],"complexes":[],"partners":["CAV1","ATG12","ATG5","FOXO3A","RBMS1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04156","full_name":"Major prion protein","aliases":["ASCR","PrP27-30","PrP33-35C"],"length_aa":253,"mass_kda":27.7,"function":"Its primary physiological function is unclear. May play a role in neuronal development and synaptic plasticity. May be required for neuronal myelin sheath maintenance. May promote myelin homeostasis through acting as an agonist for ADGRG6 receptor. May play a role in iron uptake and iron homeostasis. Soluble oligomers are toxic to cultured neuroblastoma cells and induce apoptosis (in vitro) (By similarity). Association with GPC1 (via its heparan sulfate chains) targets PRNP to lipid rafts. Also provides Cu(2+) or Zn(2+) for the ascorbate-mediated GPC1 deaminase degradation of its heparan sulfate side chains (By similarity)","subcellular_location":"Cell membrane; Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/P04156/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRNP","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRNP","total_profiled":1310},"omim":[{"mim_id":"613954","title":"FRONTOTEMPORAL DEMENTIA AND/OR AMYOTROPHIC LATERAL SCLEROSIS 6; FTDALS6","url":"https://www.omim.org/entry/613954"},{"mim_id":"610653","title":"RIBOSOMAL RNA-PROCESSING 1; RRP1","url":"https://www.omim.org/entry/610653"},{"mim_id":"610447","title":"SHADOW OF PRION PROTEIN; SPRN","url":"https://www.omim.org/entry/610447"},{"mim_id":"610245","title":"SPINOCEREBELLAR ATAXIA 23; SCA23","url":"https://www.omim.org/entry/610245"},{"mim_id":"609917","title":"ERI1 EXORIBONUCLEASE FAMILY MEMBER 3; ERI3","url":"https://www.omim.org/entry/609917"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"choroid plexus","ntpm":480.4}],"url":"https://www.proteinatlas.org/search/PRNP"},"hgnc":{"alias_symbol":["CD230","PRP","AltPrP"],"prev_symbol":["PRIP","GSS","CJD"]},"alphafold":{"accession":"P04156","domains":[{"cath_id":"1.10.790.10","chopping":"118-253","consensus_level":"medium","plddt":81.021,"start":118,"end":253}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04156","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04156-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04156-F1-predicted_aligned_error_v6.png","plddt_mean":64.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRNP","jax_strain_url":"https://www.jax.org/strain/search?query=PRNP"},"sequence":{"accession":"P04156","fasta_url":"https://rest.uniprot.org/uniprotkb/P04156.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04156/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04156"}},"corpus_meta":[{"pmid":"14522861","id":"PMC_14522861","title":"Sporadic and familial CJD: classification and characterisation.","date":"2003","source":"British medical bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/14522861","citation_count":403,"is_preprint":false},{"pmid":"15539564","id":"PMC_15539564","title":"Human prion protein with valine 129 prevents expression of variant CJD phenotype.","date":"2004","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/15539564","citation_count":202,"is_preprint":false},{"pmid":"14522863","id":"PMC_14522863","title":"Acquired prion disease: iatrogenic CJD, variant CJD, kuru.","date":"2003","source":"British medical bulletin","url":"https://pubmed.ncbi.nlm.nih.gov/14522863","citation_count":152,"is_preprint":false},{"pmid":"9462739","id":"PMC_9462739","title":"Mice with gene targetted prion protein alterations show that Prnp, Sinc and Prni are congruent.","date":"1998","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9462739","citation_count":150,"is_preprint":false},{"pmid":"30282760","id":"PMC_30282760","title":"RT-QuIC: a new test for sporadic CJD.","date":"2018","source":"Practical neurology","url":"https://pubmed.ncbi.nlm.nih.gov/30282760","citation_count":116,"is_preprint":false},{"pmid":"16141216","id":"PMC_16141216","title":"Bovine prion protein gene (PRNP) promoter polymorphisms modulate PRNP expression and may be responsible for differences in bovine spongiform encephalopathy susceptibility.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16141216","citation_count":99,"is_preprint":false},{"pmid":"8105682","id":"PMC_8105682","title":"Mutation and polymorphism of the prion protein gene in Libyan Jews with Creutzfeldt-Jakob disease (CJD).","date":"1993","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8105682","citation_count":91,"is_preprint":false},{"pmid":"12064260","id":"PMC_12064260","title":"Clinical diagnosis and differential diagnosis of CJD and vCJD. 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prion strains.\",\n      \"method\": \"Transgenic mouse model expressing human PrP Met129 or Val129; prion transmission/subpassage experiments\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean transgenic mouse loss-of-function/gain-of-function with defined phenotypic readout, replicated across multiple passage experiments in a single rigorous study\",\n      \"pmids\": [\"15539564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Gene-targeted modification of the endogenous Prnp allele to express PrP B (codon 108F and 189V) instead of PrP A dramatically shortened scrapie incubation times after challenge with mouse-adapted BSE, demonstrating that PrP dimorphisms at codons 108 and/or 189 control incubation time and that Sinc/Prni and Prnp loci are congruent.\",\n      \"method\": \"Gene targeting / knock-in mouse; challenge with mouse-adapted BSE strain; incubation time measurement\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct gene-targeting epistasis experiment with defined phenotypic readout, mechanistically linking specific PrP residues to scrapie incubation time\",\n      \"pmids\": [\"9462739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The combination of the D178N pathogenic mutation with Met129 on the mutant PRNP allele causes Fatal Familial Insomnia, whereas D178N with Val129 causes familial CJD, demonstrating that a polymorphism at codon 129 on the mutant allele determines the distinct disease phenotype produced by the same pathogenic mutation.\",\n      \"method\": \"Genetic analysis of PRNP haplotypes in affected pedigrees; co-segregation of codon 129 polymorphism with disease phenotype\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic co-segregation analysis in multiple families establishing mechanistic link between codon 129 polymorphism and phenotypic outcome of D178N mutation; single method but replicated across pedigrees\",\n      \"pmids\": [\"7999319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRNP regulates exosome secretion by suppressing CAV1-dependent autophagy; specifically, the PRNP octapeptide repeat domain impairs formation of the CAV1-ATG12-ATG5 cytoplasmic complex that drives autophagosome formation, thereby protecting multivesicular bodies from sequestration and facilitating exosome release.\",\n      \"method\": \"Primary cultures from prnp-null mice; PRNP reconstitution; BECN1 depletion; Western blot for CAV1, ATG12-ATG5 complex; MVB and autophagosome quantification by electron microscopy/immunofluorescence\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods in single lab (KO rescue, domain deletion, autophagy inhibition, complex detection), establishes pathway mechanism\",\n      \"pmids\": [\"27629560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The PRNP locus encodes a second polypeptide, AltPrP, translated from a downstream AUG codon in the +3 reading frame; AltPrP is constitutively co-expressed with PrP in human, bovine, sheep, and deer cells, localizes to mitochondria, and is up-regulated by ER stress and proteasomal inhibition.\",\n      \"method\": \"HA-tag insertion in +3 ORF; anti-HA immunoblot; siRNA knockdown of PrP mRNA confirming co-repression of AltPrP; subcellular fractionation/immunofluorescence for mitochondrial localization; detection in human brain homogenate and PBMCs\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (tag expression, siRNA co-knockdown, endogenous antibody detection, stress induction) in a single study establishing a novel translation product and its localization\",\n      \"pmids\": [\"21478263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"IGF-1 enhances PRNP expression through PI3K-Akt signaling, which phosphorylates transcription factor FOXO3a, causing its translocation from nucleus to cytoplasm and relieving its repression of the PRNP promoter; conversely, PI3K-Akt inhibition with LY294002 causes FOXO3a nuclear retention and decreased PRNP expression.\",\n      \"method\": \"Reporter gene assay; ChIP showing FOXO3a binding to PRNP promoter; pharmacological PI3K-Akt inhibition; nuclear/cytoplasmic fractionation; RT-PCR and Western blot for PRNP mRNA and protein\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, reporter assay, pharmacological inhibition, subcellular fractionation) in single lab establishing transcriptional regulatory mechanism\",\n      \"pmids\": [\"23967259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Bovine PRNP promoter polymorphisms (23-bp and 12-bp indels containing RP58-binding and SP1-binding sites, respectively) modulate PRNP expression; band shift assays showed differential transcription factor binding, reporter gene assays showed lower expression of the ins/ins allele vs. del/del, and in vivo mRNA measurements confirmed genotype-dependent expression differences in intestinal lymph nodes.\",\n      \"method\": \"Reporter gene assays; electrophoretic mobility shift assays (EMSA); in vivo PRNP mRNA quantification in calves of different genotypes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro functional promoter assay combined with in vivo mRNA quantification and EMSA, multiple methods in single study\",\n      \"pmids\": [\"16141216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Prnp knockdown in neuroblastoma cells using dual miRNA targeting (N- and C-termini simultaneously) caused increased transcript abundance of Plk3, Ppp2r2b, Csnk2a1, and 670460F02Rik, genes involved in cell proliferation and mitochondrial-mediated apoptosis, linking PrPC depletion to altered proliferation and apoptosis pathways.\",\n      \"method\": \"Dual-targeting miRNA (miRdual) construct; gene expression profiling; cell proliferation, viability and apoptosis assays in PrPC-depleted neuroblastoma cells\",\n      \"journal\": \"Prion\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, knockdown phenotype with gene expression changes but no direct mechanistic pathway validation beyond correlation\",\n      \"pmids\": [\"21494092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RBMS1 promotes PRNP translation, leading to increased PrP expression that confers ferroptosis resistance in colorectal cancer cells and contributes to oxaliplatin chemoresistance; inhibition of RBMS1 caused ferroptosis and restored oxaliplatin sensitivity.\",\n      \"method\": \"Bioinformatics analysis; in vitro knockdown/overexpression experiments; in vivo mouse xenograft models; mechanistic link between RBMS1, PRNP translation, and ferroptosis markers\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional studies establish RBMS1-PRNP-ferroptosis axis but translational mechanism not directly validated (e.g., no polysome profiling or direct reconstitution)\",\n      \"pmids\": [\"37861356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"miR-193b-3p directly targets the 3'-UTR of PRNP to suppress PrPc expression and inhibit lung cancer cell migration and invasion; c-Jun acts as a transcriptional repressor of miR-193b-3p, such that c-Jun activity upregulates PRNP through relief of miR-193b-3p-mediated repression.\",\n      \"method\": \"Dual-luciferase reporter assay (miRNA-3'UTR interaction); RNA immunoprecipitation (RIP); ChIP assay (c-Jun binding to miR-193b-3p promoter); transwell migration/invasion assays; Western blot; RT-PCR; in vivo xenograft models\",\n      \"journal\": \"Journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (luciferase reporter, RIP, ChIP, rescue experiments, in vivo) in single study establishing post-transcriptional regulatory mechanism for PRNP\",\n      \"pmids\": [\"39972491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In Ngsk Prnp-deficient mice, ectopic expression of Doppel (Dpl) in cerebellar Purkinje cells triggers both autophagy and apoptosis; autophagic markers LC3B, p62, and Scrg1 accumulate at the protein but not mRNA level, and autophagic-like profiles accumulate in somatodendritic and axonal compartments, suggesting impaired autophagic flux. This demonstrates that PrP normally protects against Dpl-induced autophagy/apoptosis in Purkinje cells.\",\n      \"method\": \"Western blotting and immunohistofluorescence for autophagy markers; RT-PCR; ultrastructural electron microscopy; comparison of Prnp-null vs. wild-type mice\",\n      \"journal\": \"Brain pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (biochemical, morphological, ultrastructural) in Prnp-null model establishing protective role of PrP against Dpl-induced autophagy/apoptosis\",\n      \"pmids\": [\"19055638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Prnp mRNA is expressed in mouse spermatogenic cells (spermatogonia, spermatocytes, and round spermatids) but not in somatic testicular cells (Sertoli, Leydig, peritubular myoid) or elongated spermatids/spermatozoa, suggesting a role for PrP in germ cell differentiation during spermatogenesis.\",\n      \"method\": \"Northern blot analysis of Prnp transcripts in testes at multiple developmental time points; in situ hybridization on testis sections\",\n      \"journal\": \"The Journal of reproduction and development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by in situ hybridization without direct functional consequence established\",\n      \"pmids\": [\"15514463\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRNP encodes the cellular prion protein (PrPC), a GPI-anchored cell-surface glycoprotein whose codon 129 Met/Val polymorphism dictates prion strain propagation and disease phenotype (including modulating the outcome of pathogenic mutations such as D178N); PrPC promotes exosome secretion by suppressing CAV1-dependent autophagy via its octapeptide repeat domain, is transcriptionally regulated by an IGF-1–PI3K–Akt–FOXO3a axis, is post-transcriptionally repressed by miR-193b-3p (itself controlled by c-Jun), and is translationally induced by RBMS1 to confer ferroptosis resistance; additionally, the locus encodes a second mitochondrially-localized polypeptide (AltPrP) from a +3 reading-frame AUG, and promoter polymorphisms control PrP expression levels that influence prion disease susceptibility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRNP encodes the cellular prion protein (PrPC), whose codon 129 Met/Val polymorphism acts as a principal determinant of prion strain propagation and disease phenotype: human PrP with Met129 is required to generate the vCJD phenotype after BSE infection, while Val129 propagates a distinct strain and maintains a transmission barrier [#0], and the same codon 129 polymorphism cis to the pathogenic D178N mutation dictates whether the resulting disease is Fatal Familial Insomnia (Met129) or familial CJD (Val129) [#2]. PrP dimorphisms also govern disease kinetics, as gene-targeted substitution of mouse PrP residues at codons 108/189 dramatically alters scrapie incubation time and maps the Sinc/Prni locus to Prnp [#1]. Beyond prion biology, PrPC functions in cellular trafficking and survival pathways: its octapeptide repeat domain suppresses CAV1-dependent autophagy by impairing assembly of the CAV1-ATG12-ATG5 complex, thereby protecting multivesicular bodies and promoting exosome release [#3], and PrP protects cerebellar Purkinje cells against Doppel-induced autophagy and apoptosis [#10]. PrP expression is controlled at multiple levels — transcriptionally through an IGF-1\\u2013PI3K\\u2013Akt axis that phosphorylates and exports the repressor FOXO3a from the PRNP promoter [#5], through promoter indel polymorphisms altering transcription-factor binding [#6], and post-transcriptionally via direct miR-193b-3p targeting of the 3'-UTR, itself under c-Jun control [#9]. The locus additionally encodes AltPrP, a mitochondrially-localized polypeptide translated from a +3 reading-frame AUG and induced by ER stress [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that a single coding polymorphism can redirect the phenotypic outcome of a fixed pathogenic mutation, answering why identical D178N mutations cause two distinct diseases.\",\n      \"evidence\": \"Genetic haplotype analysis and codon 129 co-segregation across affected pedigrees\",\n      \"pmids\": [\"7999319\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Does not establish the molecular basis by which the codon 129 residue alters misfolding conformation\", \"Single genetic method without biochemical reconstitution\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated that specific PrP residues, not a separate locus, control scrapie incubation time, resolving the congruence of Sinc/Prni with Prnp.\",\n      \"evidence\": \"Gene-targeted knock-in of PrP codon 108/189 variants challenged with mouse-adapted BSE\",\n      \"pmids\": [\"9462739\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism linking residues 108/189 to conversion kinetics not defined\", \"Restricted to mouse-adapted BSE strain\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that codon 129 genotype dictates which prion strain propagates and whether a transmission barrier persists, establishing the polymorphism as a strain-selection determinant.\",\n      \"evidence\": \"Transgenic mice expressing human PrP Met129 or Val129 with BSE transmission and subpassage\",\n      \"pmids\": [\"15539564\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Structural basis of strain selection by residue 129 unresolved\", \"Does not address host factors beyond PrP sequence\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapped Prnp expression to specific germ cell stages, raising a candidate role in spermatogenesis.\",\n      \"evidence\": \"Northern blot and in situ hybridization across testicular cell types and developmental time points\",\n      \"pmids\": [\"15514463\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Localization only \\u2014 no functional consequence for fertility or germ cell differentiation established\", \"No protein-level confirmation\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified that promoter indel polymorphisms set basal PrP expression levels via differential transcription-factor binding, linking regulatory variation to disease susceptibility.\",\n      \"evidence\": \"Reporter assays, EMSA, and in vivo mRNA quantification across bovine genotypes\",\n      \"pmids\": [\"16141216\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Identity of functional transcription factors at the indels inferred from binding sites\", \"Human relevance not directly tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided evidence that PrP normally protects neurons against Doppel-induced autophagy and apoptosis, connecting PrP loss to neurodegeneration in Purkinje cells.\",\n      \"evidence\": \"Autophagy/apoptosis markers and ultrastructure in Ngsk Prnp-null vs. wild-type cerebellum\",\n      \"pmids\": [\"19055638\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism by which PrP antagonizes Dpl toxicity not defined\", \"Specific to Purkinje cell context\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked PrPC depletion to altered transcription of proliferation and mitochondrial apoptosis genes, hinting at a survival-regulatory role.\",\n      \"evidence\": \"Dual-targeting miRNA knockdown with expression profiling and viability assays in neuroblastoma cells\",\n      \"pmids\": [\"21494092\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Correlative transcript changes without validated mechanistic pathway\", \"Off-target effects of dual miRNA not excluded\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed that the PRNP locus is bicistronic, encoding a mitochondrial polypeptide AltPrP from an alternate reading frame, expanding the locus's coding capacity.\",\n      \"evidence\": \"HA-tag insertion in +3 ORF, siRNA co-knockdown, endogenous antibody detection, and fractionation across multiple species\",\n      \"pmids\": [\"21478263\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Function of AltPrP at mitochondria unknown\", \"Role in prion disease not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined an IGF-1\\u2013PI3K\\u2013Akt\\u2013FOXO3a transcriptional axis controlling PRNP expression, identifying an upstream signaling input.\",\n      \"evidence\": \"Reporter assay, ChIP for FOXO3a promoter binding, pharmacological PI3K inhibition, and subcellular fractionation\",\n      \"pmids\": [\"23967259\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Physiological contexts engaging this axis not mapped\", \"FOXO3a co-regulators at the promoter not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established a non-prion cellular function: the PrP octapeptide repeat domain suppresses CAV1-dependent autophagy to promote exosome secretion.\",\n      \"evidence\": \"Prnp-null rescue, domain deletion, autophagy inhibition, and CAV1-ATG12-ATG5 complex detection with EM/IF quantification\",\n      \"pmids\": [\"27629560\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct binding of octapeptide repeats to complex components not demonstrated\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Implicated RBMS1-driven PRNP translation in ferroptosis resistance and chemoresistance, extending PrP function to cancer cell survival.\",\n      \"evidence\": \"Knockdown/overexpression, xenografts, and ferroptosis marker analysis in colorectal cancer cells\",\n      \"pmids\": [\"37861356\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Translational mechanism not directly validated (no polysome profiling or reconstitution)\", \"Direct RBMS1-PRNP mRNA interaction not shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a c-Jun\\u2013miR-193b-3p axis post-transcriptionally controlling PRNP, linking PrP to lung cancer cell migration and invasion.\",\n      \"evidence\": \"Luciferase 3'-UTR reporter, RIP, c-Jun ChIP, rescue, and xenograft assays\",\n      \"pmids\": [\"39972491\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Downstream effectors of PrP in invasion not defined\", \"Single-study mechanism\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PrPC's normal cellular functions (exosome/autophagy regulation, survival signaling) mechanistically relate to its conversion into pathogenic prions and to codon 129/108/189-dictated strain selection remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model linking polymorphic residues to strain conformation\", \"Connection between physiological PrP functions and conversion mechanism unestablished\", \"Role of AltPrP in disease unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 10]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CAV1\", \"ATG12\", \"ATG5\", \"FOXO3a\", \"RBMS1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}