{"gene":"PRPH","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2004,"finding":"A 1-bp deletion in PRPH exon 1 (PRPH228delC) produces a truncated peripherin species of 85 amino acids that disrupts neurofilament network assembly when expressed in SW13 cells, demonstrating that frameshift mutations in PRPH can cause cytoskeletal disorganization.","method":"Cell transfection (SW13 cells devoid of intermediate filaments), immunofluorescence imaging of neurofilament network","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct loss-of-function cellular assay with defined phenotypic readout (network disruption), single lab, single method","pmids":["15322088"],"is_preprint":false},{"year":2004,"finding":"A missense mutation D141Y in the rod domain linker region of PRPH causes peripherin to form aggregates instead of a filamentous network in transfected cells; NF-L co-expression could not rescue the mutant from aggregation, indicating the mutation intrinsically impairs peripherin self-assembly.","method":"Transient transfection of mutant PRPH in cell lines, immunocytochemistry","journal":"Brain pathology (Zurich, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional assay with mutagenesis and rescue experiment, single lab","pmids":["15446584"],"is_preprint":false},{"year":2019,"finding":"A low-frequency splice-donor variant in PRPH (c.996+1G>A) leads to loss-of-function: when over-expressed in a cell line devoid of intermediate filaments, the variant protein fails to form the normal filamentous structure and instead produces punctate protein inclusions, confirming that peripherin's filament-forming capacity requires the intact splice site.","method":"RNA and protein studies, overexpression in intermediate-filament-free cell line, immunofluorescence; population-level genome-wide association and neurological recall study","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro filament assembly assay plus mutagenesis/variant characterization, replicated functionally by neurological phenotyping of homozygous carriers","pmids":["30992453"],"is_preprint":false},{"year":2015,"finding":"Peripherin (Prph) is required for type II spiral ganglion neuron (SGN) innervation of outer hair cells; Prph-null mice lack type II SGN outer hair cell contacts while type I SGN innervation is normal. Loss of type II SGN innervation abolishes both contralateral and ipsilateral medial olivocochlear efferent-mediated suppression of the cochlear amplifier, identifying type II SGNs as the sensory driver of the olivocochlear reflex.","method":"Prph knockout mouse model, immunolabeling, auditory brainstem response, distortion-product otoacoustic emission measurements, efferent suppression assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple orthogonal functional readouts (anatomy + physiology), clearly defines pathway position","pmids":["25965946"],"is_preprint":false},{"year":2022,"finding":"Prph knockout mice show disrupted type II SGN outer spiral bundle innervation and attenuated contralateral suppression of the medial olivocochlear (MOC) reflex; however, direct electrical stimulation of MOC efferents still suppresses DPOAEs, indicating that Prph loss affects the afferent sensory arm rather than the efferent motor arm of the otoprotective circuit. Prph-KO mice suffer permanent high-frequency hearing loss after noise exposure that wildtype mice are protected from, consistent with loss of the MOC feedback circuit.","method":"Prph knockout mouse model, DPOAE suppression (contralateral and direct electrical), ABR threshold measurement, noise-exposure paradigm","journal":"Frontiers in neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple orthogonal audiological measures and noise-exposure challenge, replicates and extends PMID 25965946","pmids":["36226085"],"is_preprint":false},{"year":2021,"finding":"Peripherin (PRPH) facilitates Enterovirus-A71 (EV-A71) invasion of the central nervous system: surface-expressed PRPH promotes viral entry into motor neuron-like and neuroblastoma cells, while intracellular PRPH influences viral genome replication through physical interactions with structural and non-structural viral components. PRPH does not play a role during coxsackievirus A16 infection, demonstrating specificity for EV-A71. EV-A71 also exploits PRPH-interacting partner Rac1, identified as a potential druggable target.","method":"Co-localization in infected mice (IHC), siRNA knockdown and overexpression in cell lines, viral entry and replication assays, co-immunoprecipitation with viral components","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (in vivo co-localization, cell line KD/OE, viral entry assay, Co-IP with viral partners), single lab but rigorous","pmids":["33871166"],"is_preprint":false},{"year":2014,"finding":"Motor neurons differentiated from GAN patient iPSCs accumulate NF-L and peripherin (PRPH) protein and form PRPH aggregates. Reintroduction of gigaxonin (via lentiviral vector or stable transgene) normalizes NEFL and PRPH levels and eliminates PRPH aggregates, demonstrating that gigaxonin mediates degradation of PRPH and that loss of gigaxonin is sufficient to cause peripherin aggregation.","method":"iPSC-derived motor neurons from GAN patients, lentiviral gigaxonin rescue, Western blot for protein levels, immunofluorescence for aggregate detection","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — disease model combined with rescue by reintroduction of the E3 ligase adaptor gigaxonin, multiple patient lines, orthogonal methods","pmids":["25398950"],"is_preprint":false},{"year":2023,"finding":"Peripherin overexpression in gigaxonin-null mice (Gan-/-;TgPer) drives neurofilament disorganization, axonal swellings ('giant axons'), neuroinflammation, and loss of cortical and spinal neurons, demonstrating that peripherin accumulation is sufficient to cause neurodegeneration when gigaxonin-mediated degradation is absent.","method":"Transgenic mouse genetics (Prph overexpressor × Gan knockout), histology, immunofluorescence, behavioral testing","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-mutant genetic model with defined structural and behavioral phenotypes, consistent with gigaxonin–peripherin degradation axis","pmids":["37137704"],"is_preprint":false},{"year":1995,"finding":"Transcriptional activation of the peripherin (Prph) gene depends on a G+C-rich promoter element (PER3) that binds transcription factor Sp1 in vitro (gel retardation and methylation interference) and in vivo. A 3-bp mutation abolishing Sp1 binding eliminates reporter expression from PER3+PER1 constructs, and Sp1 over-expression stimulates PER3-driven transcription, identifying Sp1 as a direct transcriptional activator of PRPH.","method":"Gel retardation assay, methylation interference, anti-Sp1 supershift, reporter gene transfection with mutagenesis, Sp1 co-transfection","journal":"Gene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding assays with mutagenesis and in vivo co-transfection rescue, single lab but multiple orthogonal methods","pmids":["7622044"],"is_preprint":false},{"year":1994,"finding":"The human PRPH gene has a conserved structure of 9 exons separated by 8 introns, and its 5' flanking region contains conserved potential regulatory elements including a nerve growth factor negative regulatory element, a Hox protein binding site, and a heat shock element, suggesting these elements control tissue-specific and injury-specific expression.","method":"Genomic DNA sequencing, comparative sequence analysis across human, rat, and mouse","journal":"Genomics","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/comparative sequence analysis only; regulatory element function not experimentally validated","pmids":["7806235"],"is_preprint":false},{"year":2018,"finding":"miR-105 and miR-9 bind the 3'UTRs of PRPH (and NEFL, INA) mRNAs to regulate their mRNA stability; both miRNAs are down-regulated in ALS spinal cord and endogenously regulate PRPH mRNA levels in a neuronal-derived cell line, implicating miRNA-mediated post-transcriptional control in peripherin stoichiometry and IF aggregation in ALS.","method":"3'UTR luciferase reporter assays, endogenous mRNA stability assay in neuronal cell line, qPCR of ALS patient spinal cord","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct 3'UTR targeting assays plus endogenous mRNA stability measurement, single lab","pmids":["30385300"],"is_preprint":false},{"year":2021,"finding":"Peripherin (Prph) expression is initially present in both type I and type II spiral ganglion neurons (SGNs) but becomes progressively restricted to type II SGN cell bodies by postnatal day 8, while processes of both types continue to express Prph until around P30; the restriction to type II cell bodies and central processes is complete by P30 and maintained through adulthood up to 9 months.","method":"Transgenic Prph-eGFP reporter mice, fluorescence imaging and immunohistochemistry at multiple developmental time points","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo live reporter imaging with temporal resolution, single lab, defines subcellular/cell-type localization during development","pmids":["34211371"],"is_preprint":false},{"year":2008,"finding":"The human PRPH genomic locus drives fluorescent EGFP reporter expression concomitant with neuronal cell fate acquisition during mouse development; in adult transgenic mice, sensory neurons are labeled in both peripheral and central nervous system, while spinal motor neurons show more limited expression, establishing the spatial specificity of the PRPH promoter in vivo.","method":"BAC-based EGFP knockin transgenic mouse, fluorescence imaging of embryos and adults, immunohistochemistry","journal":"Transgenic research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo reporter imaging with functional promoter validation, single lab","pmids":["18709437"],"is_preprint":false},{"year":2020,"finding":"shRNA-mediated knockdown of PRPH in bone marrow mesenchymal stem cells (BMMSCs) from Wuzhishan mini pigs reduces cell migration capacity, as assessed by scratch assay, transwell migration assay, and filamentous actin staining, indicating that peripherin regulates cytoskeletal dynamics required for BMMSC migration.","method":"shRNA knockdown, scratch assay, transwell migration assay, F-actin staining","journal":"Stem cells international","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, indirect readout (migration), no mechanistic pathway placement beyond cytoskeletal effect","pmids":["33101422"],"is_preprint":false},{"year":2006,"finding":"Peripherin/rds (PRPH2/RDS, a distinct gene from PRPH peripherin) forms a fusion-competent complex with ROM-1 for photoreceptor outer segment membrane fusion; this finding is specifically about PRPH2/RDS and ROM-1, not the neuronal peripherin PRPH gene.","method":"COS cell transfection, cell-free fusion assay","journal":"Experimental eye research","confidence":"Low","confidence_rationale":"EXCLUDED — this paper concerns peripherin-2/RDS (PRPH2), a distinct gene from neuronal peripherin (PRPH); not applicable","pmids":["17055485"],"is_preprint":false},{"year":2026,"finding":"Elements of the Xenopus laevis prph gene promoter and intron 1 are necessary for neuronal expression; deletion and motif analyses in transgenic X. laevis identified cis-regulatory regions sufficient to drive reporter expression in peripheral nerves and during axon regeneration, supporting conserved intrinsic regulation of peripherin during nerve outgrowth.","method":"Transgenic X. laevis with EGFP reporters driven by prph promoter/intron deletions, in vivo imaging during limb development and regeneration","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — deletion and motif analysis with in vivo reporter validation in ortholog, single lab","pmids":["42145051"],"is_preprint":false}],"current_model":"Peripherin (PRPH) is a type III neuronal intermediate filament protein whose self-assembly into filamentous networks is required for normal cytoskeletal architecture in peripheral neurons; its expression is transcriptionally activated by Sp1 binding to a GC-rich promoter element and post-transcriptionally regulated by miR-9 and miR-105 targeting its 3'UTR, while its protein levels are controlled by gigaxonin-mediated ubiquitin-proteasome degradation such that gigaxonin loss causes peripherin accumulation and aggregation leading to neurodegeneration. In the cochlea, peripherin is essential for type II spiral ganglion neuron innervation of outer hair cells and thereby drives the afferent sensory arm of the medial olivocochlear efferent reflex that protects hearing. Pathogenic PRPH mutations (e.g., D141Y, 228delC) disrupt filament assembly and are linked to ALS, and a splice-donor loss-of-function variant causes sensory polyneuropathy. EV-A71 exploits surface and intracellular peripherin for CNS invasion via interactions with viral components and the host GTPase Rac1."},"narrative":{"mechanistic_narrative":"Peripherin (PRPH) is a type III neuronal intermediate filament protein whose self-assembly into filamentous networks underlies cytoskeletal architecture in sensory and motor neurons, and disease-associated variants cause neurodegeneration by disrupting this assembly [PMID:15322088, PMID:15446584, PMID:30992453]. Frameshift (228delC), missense (D141Y in the rod-domain linker), and splice-donor (c.996+1G>A) mutations all abolish normal filament formation in intermediate-filament-free cells, producing truncated species, aggregates, or punctate inclusions rather than networks, with the splice-donor loss-of-function allele linked to sensory polyneuropathy in homozygous carriers [PMID:15322088, PMID:15446584, PMID:30992453]. Peripherin abundance is tightly controlled: it is transcriptionally activated by Sp1 binding to a GC-rich promoter element [PMID:7622044], post-transcriptionally regulated by miR-9 and miR-105 targeting of its 3'UTR [PMID:30385300], and turned over by gigaxonin-dependent degradation, such that loss of gigaxonin causes peripherin accumulation and aggregation in patient motor neurons and is sufficient to drive giant axons, neuroinflammation, and neuronal loss when peripherin is overexpressed in gigaxonin-null mice [PMID:25398950, PMID:37137704]. In the cochlea, peripherin is required for type II spiral ganglion neuron innervation of outer hair cells and thereby drives the afferent sensory arm of the medial olivocochlear efferent reflex that protects hearing from noise damage [PMID:25965946, PMID:36226085]. Peripherin is also exploited by Enterovirus-A71 for CNS invasion, with surface peripherin promoting viral entry and intracellular peripherin supporting genome replication through interactions with viral components and the host GTPase Rac1 [PMID:33871166].","teleology":[{"year":1994,"claim":"Established the genomic organization and candidate regulatory architecture of human PRPH, framing how tissue- and injury-specific expression might be controlled.","evidence":"Genomic sequencing and comparative analysis across human, rat, and mouse","pmids":["7806235"],"confidence":"Low","gaps":["Regulatory elements identified only by sequence conservation, not experimentally validated","No functional reporter test of the proposed NGF, Hox, or heat-shock elements"]},{"year":1995,"claim":"Identified a direct transcriptional activator of PRPH, answering how the gene is switched on at the promoter level.","evidence":"Gel retardation, methylation interference, supershift, and reporter co-transfection with Sp1 in vitro and in vivo","pmids":["7622044"],"confidence":"High","gaps":["Does not establish how Sp1 activity is restricted to neurons","Other promoter/intronic elements not dissected"]},{"year":2004,"claim":"Demonstrated that PRPH coding mutations disrupt filament network assembly, providing the first mechanistic link between PRPH lesions and cytoskeletal disorganization.","evidence":"Transfection of 228delC and D141Y mutants in intermediate-filament-free cells with immunofluorescence; NF-L co-expression rescue attempt","pmids":["15322088","15446584"],"confidence":"Medium","gaps":["Single cellular overexpression system, not endogenous neurons","Aggregate toxicity mechanism not defined"]},{"year":2008,"claim":"Defined the in vivo spatial specificity of the PRPH promoter, showing it drives expression in sensory neurons and more limited motor neuron populations.","evidence":"BAC-EGFP knockin transgenic mice with fluorescence imaging and IHC","pmids":["18709437"],"confidence":"Medium","gaps":["Promoter elements responsible for cell-type specificity not mapped","Does not address protein function"]},{"year":2014,"claim":"Placed PRPH within a degradation axis, showing gigaxonin controls peripherin protein levels and that gigaxonin loss is sufficient for peripherin aggregation.","evidence":"GAN patient iPSC-derived motor neurons with lentiviral gigaxonin rescue, Western blot, immunofluorescence","pmids":["25398950"],"confidence":"High","gaps":["Direct ubiquitination of peripherin by a gigaxonin-containing ligase not demonstrated biochemically","Relationship between aggregation and neuronal death not established here"]},{"year":2015,"claim":"Defined a discrete physiological role for peripherin in the auditory system, identifying it as required for type II SGN innervation of outer hair cells and the sensory arm of the olivocochlear reflex.","evidence":"Prph knockout mice with immunolabeling, ABR, DPOAE, and efferent suppression assays","pmids":["25965946"],"confidence":"High","gaps":["Molecular basis of why filament loss abolishes type II innervation unknown","Does not distinguish developmental versus maintenance requirement"]},{"year":2018,"claim":"Identified post-transcriptional control of peripherin, showing miR-9 and miR-105 regulate PRPH mRNA stability and are dysregulated in ALS.","evidence":"3'UTR luciferase reporters, endogenous mRNA stability assays, qPCR of ALS spinal cord","pmids":["30385300"],"confidence":"Medium","gaps":["Causal contribution of miRNA loss to ALS aggregation not demonstrated in vivo","Single neuronal cell line for endogenous validation"]},{"year":2019,"claim":"Linked a human loss-of-function splice variant to disease and confirmed loss of filament-forming capacity, connecting PRPH dysfunction to sensory polyneuropathy.","evidence":"RNA/protein studies and filament assembly assay in IF-free cells plus population GWAS and neurological recall of homozygous carriers","pmids":["30992453"],"confidence":"High","gaps":["Mechanism connecting filament loss to peripheral nerve pathology not resolved","Penetrance and modifiers not characterized"]},{"year":2021,"claim":"Established peripherin as a host factor exploited by EV-A71 for CNS invasion, distinguishing entry and replication roles and identifying Rac1 as a partner.","evidence":"In vivo co-localization, siRNA/overexpression in motor neuron-like and neuroblastoma cells, viral entry/replication assays, Co-IP with viral components","pmids":["33871166"],"confidence":"High","gaps":["Structural basis of peripherin-viral component interaction not defined","Mechanism by which surface peripherin promotes entry unresolved"]},{"year":2023,"claim":"Demonstrated that peripherin accumulation is sufficient to cause neurodegeneration in the absence of gigaxonin, completing the gigaxonin-peripherin pathological axis.","evidence":"Prph overexpressor x Gan knockout double-mutant mice with histology, immunofluorescence, and behavior","pmids":["37137704"],"confidence":"High","gaps":["Does not isolate which downstream events (filament disorganization vs inflammation) drive neuronal loss","Therapeutic reversibility not tested"]},{"year":null,"claim":"The biochemical mechanism linking peripherin filament assembly to specific neuronal functions (type II SGN innervation, axon regeneration, sensory nerve maintenance) and the direct enzymology of its gigaxonin-dependent turnover remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of peripherin filament assembly or mutant aggregation","Direct ubiquitin ligase biochemistry on peripherin not reconstituted","Mechanistic coupling between filament integrity and synaptic/innervation phenotypes undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1,13]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,7]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[3,4]}],"complexes":[],"partners":["GAN","RAC1","SP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P23942","full_name":"Peripherin-2","aliases":["Retinal degeneration slow protein","Tetraspanin-22","Tspan-22"],"length_aa":346,"mass_kda":39.3,"function":"Essential for retina photoreceptor outer segment disk morphogenesis, may also play a role with ROM1 in the maintenance of outer segment disk structure (By similarity). Required for the maintenance of retinal outer nuclear layer thickness (By similarity). Required for the correct development and organization of the photoreceptor inner segment (By similarity)","subcellular_location":"Membrane; Cell projection, cilium, photoreceptor outer segment; Photoreceptor inner segment","url":"https://www.uniprot.org/uniprotkb/P23942/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PRPH","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PRPH","total_profiled":1310},"omim":[{"mim_id":"609311","title":"CHARCOT-MARIE-TOOTH DISEASE, DEMYELINATING, TYPE 4H; CMT4H","url":"https://www.omim.org/entry/609311"},{"mim_id":"179605","title":"PERIPHERIN 2; PRPH2","url":"https://www.omim.org/entry/179605"},{"mim_id":"170710","title":"PERIPHERIN; PRPH","url":"https://www.omim.org/entry/170710"},{"mim_id":"105400","title":"AMYOTROPHIC LATERAL SCLEROSIS 1; ALS1","url":"https://www.omim.org/entry/105400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":30.8},{"tissue":"testis","ntpm":16.3}],"url":"https://www.proteinatlas.org/search/PRPH"},"hgnc":{"alias_symbol":["PRPH1"],"prev_symbol":["NEF4"]},"alphafold":{"accession":"P23942","domains":[{"cath_id":"-","chopping":"4-138_253-302","consensus_level":"high","plddt":90.5962,"start":4,"end":302},{"cath_id":"-","chopping":"172-246","consensus_level":"medium","plddt":92.8673,"start":172,"end":246}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P23942","model_url":"https://alphafold.ebi.ac.uk/files/AF-P23942-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P23942-F1-predicted_aligned_error_v6.png","plddt_mean":87.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PRPH","jax_strain_url":"https://www.jax.org/strain/search?query=PRPH"},"sequence":{"accession":"P23942","fasta_url":"https://rest.uniprot.org/uniprotkb/P23942.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P23942/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P23942"}},"corpus_meta":[{"pmid":"11853768","id":"PMC_11853768","title":"Retinal 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imaging of neurofilament network\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct loss-of-function cellular assay with defined phenotypic readout (network disruption), single lab, single method\",\n      \"pmids\": [\"15322088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A missense mutation D141Y in the rod domain linker region of PRPH causes peripherin to form aggregates instead of a filamentous network in transfected cells; NF-L co-expression could not rescue the mutant from aggregation, indicating the mutation intrinsically impairs peripherin self-assembly.\",\n      \"method\": \"Transient transfection of mutant PRPH in cell lines, immunocytochemistry\",\n      \"journal\": \"Brain pathology (Zurich, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional assay with mutagenesis and rescue experiment, single lab\",\n      \"pmids\": [\"15446584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A low-frequency splice-donor variant in PRPH (c.996+1G>A) leads to loss-of-function: when over-expressed in a cell line devoid of intermediate filaments, the variant protein fails to form the normal filamentous structure and instead produces punctate protein inclusions, confirming that peripherin's filament-forming capacity requires the intact splice site.\",\n      \"method\": \"RNA and protein studies, overexpression in intermediate-filament-free cell line, immunofluorescence; population-level genome-wide association and neurological recall study\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro filament assembly assay plus mutagenesis/variant characterization, replicated functionally by neurological phenotyping of homozygous carriers\",\n      \"pmids\": [\"30992453\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Peripherin (Prph) is required for type II spiral ganglion neuron (SGN) innervation of outer hair cells; Prph-null mice lack type II SGN outer hair cell contacts while type I SGN innervation is normal. Loss of type II SGN innervation abolishes both contralateral and ipsilateral medial olivocochlear efferent-mediated suppression of the cochlear amplifier, identifying type II SGNs as the sensory driver of the olivocochlear reflex.\",\n      \"method\": \"Prph knockout mouse model, immunolabeling, auditory brainstem response, distortion-product otoacoustic emission measurements, efferent suppression assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple orthogonal functional readouts (anatomy + physiology), clearly defines pathway position\",\n      \"pmids\": [\"25965946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Prph knockout mice show disrupted type II SGN outer spiral bundle innervation and attenuated contralateral suppression of the medial olivocochlear (MOC) reflex; however, direct electrical stimulation of MOC efferents still suppresses DPOAEs, indicating that Prph loss affects the afferent sensory arm rather than the efferent motor arm of the otoprotective circuit. Prph-KO mice suffer permanent high-frequency hearing loss after noise exposure that wildtype mice are protected from, consistent with loss of the MOC feedback circuit.\",\n      \"method\": \"Prph knockout mouse model, DPOAE suppression (contralateral and direct electrical), ABR threshold measurement, noise-exposure paradigm\",\n      \"journal\": \"Frontiers in neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple orthogonal audiological measures and noise-exposure challenge, replicates and extends PMID 25965946\",\n      \"pmids\": [\"36226085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Peripherin (PRPH) facilitates Enterovirus-A71 (EV-A71) invasion of the central nervous system: surface-expressed PRPH promotes viral entry into motor neuron-like and neuroblastoma cells, while intracellular PRPH influences viral genome replication through physical interactions with structural and non-structural viral components. PRPH does not play a role during coxsackievirus A16 infection, demonstrating specificity for EV-A71. EV-A71 also exploits PRPH-interacting partner Rac1, identified as a potential druggable target.\",\n      \"method\": \"Co-localization in infected mice (IHC), siRNA knockdown and overexpression in cell lines, viral entry and replication assays, co-immunoprecipitation with viral components\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (in vivo co-localization, cell line KD/OE, viral entry assay, Co-IP with viral partners), single lab but rigorous\",\n      \"pmids\": [\"33871166\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Motor neurons differentiated from GAN patient iPSCs accumulate NF-L and peripherin (PRPH) protein and form PRPH aggregates. Reintroduction of gigaxonin (via lentiviral vector or stable transgene) normalizes NEFL and PRPH levels and eliminates PRPH aggregates, demonstrating that gigaxonin mediates degradation of PRPH and that loss of gigaxonin is sufficient to cause peripherin aggregation.\",\n      \"method\": \"iPSC-derived motor neurons from GAN patients, lentiviral gigaxonin rescue, Western blot for protein levels, immunofluorescence for aggregate detection\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — disease model combined with rescue by reintroduction of the E3 ligase adaptor gigaxonin, multiple patient lines, orthogonal methods\",\n      \"pmids\": [\"25398950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Peripherin overexpression in gigaxonin-null mice (Gan-/-;TgPer) drives neurofilament disorganization, axonal swellings ('giant axons'), neuroinflammation, and loss of cortical and spinal neurons, demonstrating that peripherin accumulation is sufficient to cause neurodegeneration when gigaxonin-mediated degradation is absent.\",\n      \"method\": \"Transgenic mouse genetics (Prph overexpressor × Gan knockout), histology, immunofluorescence, behavioral testing\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-mutant genetic model with defined structural and behavioral phenotypes, consistent with gigaxonin–peripherin degradation axis\",\n      \"pmids\": [\"37137704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Transcriptional activation of the peripherin (Prph) gene depends on a G+C-rich promoter element (PER3) that binds transcription factor Sp1 in vitro (gel retardation and methylation interference) and in vivo. A 3-bp mutation abolishing Sp1 binding eliminates reporter expression from PER3+PER1 constructs, and Sp1 over-expression stimulates PER3-driven transcription, identifying Sp1 as a direct transcriptional activator of PRPH.\",\n      \"method\": \"Gel retardation assay, methylation interference, anti-Sp1 supershift, reporter gene transfection with mutagenesis, Sp1 co-transfection\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assays with mutagenesis and in vivo co-transfection rescue, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"7622044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The human PRPH gene has a conserved structure of 9 exons separated by 8 introns, and its 5' flanking region contains conserved potential regulatory elements including a nerve growth factor negative regulatory element, a Hox protein binding site, and a heat shock element, suggesting these elements control tissue-specific and injury-specific expression.\",\n      \"method\": \"Genomic DNA sequencing, comparative sequence analysis across human, rat, and mouse\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/comparative sequence analysis only; regulatory element function not experimentally validated\",\n      \"pmids\": [\"7806235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"miR-105 and miR-9 bind the 3'UTRs of PRPH (and NEFL, INA) mRNAs to regulate their mRNA stability; both miRNAs are down-regulated in ALS spinal cord and endogenously regulate PRPH mRNA levels in a neuronal-derived cell line, implicating miRNA-mediated post-transcriptional control in peripherin stoichiometry and IF aggregation in ALS.\",\n      \"method\": \"3'UTR luciferase reporter assays, endogenous mRNA stability assay in neuronal cell line, qPCR of ALS patient spinal cord\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct 3'UTR targeting assays plus endogenous mRNA stability measurement, single lab\",\n      \"pmids\": [\"30385300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Peripherin (Prph) expression is initially present in both type I and type II spiral ganglion neurons (SGNs) but becomes progressively restricted to type II SGN cell bodies by postnatal day 8, while processes of both types continue to express Prph until around P30; the restriction to type II cell bodies and central processes is complete by P30 and maintained through adulthood up to 9 months.\",\n      \"method\": \"Transgenic Prph-eGFP reporter mice, fluorescence imaging and immunohistochemistry at multiple developmental time points\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo live reporter imaging with temporal resolution, single lab, defines subcellular/cell-type localization during development\",\n      \"pmids\": [\"34211371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The human PRPH genomic locus drives fluorescent EGFP reporter expression concomitant with neuronal cell fate acquisition during mouse development; in adult transgenic mice, sensory neurons are labeled in both peripheral and central nervous system, while spinal motor neurons show more limited expression, establishing the spatial specificity of the PRPH promoter in vivo.\",\n      \"method\": \"BAC-based EGFP knockin transgenic mouse, fluorescence imaging of embryos and adults, immunohistochemistry\",\n      \"journal\": \"Transgenic research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo reporter imaging with functional promoter validation, single lab\",\n      \"pmids\": [\"18709437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"shRNA-mediated knockdown of PRPH in bone marrow mesenchymal stem cells (BMMSCs) from Wuzhishan mini pigs reduces cell migration capacity, as assessed by scratch assay, transwell migration assay, and filamentous actin staining, indicating that peripherin regulates cytoskeletal dynamics required for BMMSC migration.\",\n      \"method\": \"shRNA knockdown, scratch assay, transwell migration assay, F-actin staining\",\n      \"journal\": \"Stem cells international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, indirect readout (migration), no mechanistic pathway placement beyond cytoskeletal effect\",\n      \"pmids\": [\"33101422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Peripherin/rds (PRPH2/RDS, a distinct gene from PRPH peripherin) forms a fusion-competent complex with ROM-1 for photoreceptor outer segment membrane fusion; this finding is specifically about PRPH2/RDS and ROM-1, not the neuronal peripherin PRPH gene.\",\n      \"method\": \"COS cell transfection, cell-free fusion assay\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"EXCLUDED — this paper concerns peripherin-2/RDS (PRPH2), a distinct gene from neuronal peripherin (PRPH); not applicable\",\n      \"pmids\": [\"17055485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Elements of the Xenopus laevis prph gene promoter and intron 1 are necessary for neuronal expression; deletion and motif analyses in transgenic X. laevis identified cis-regulatory regions sufficient to drive reporter expression in peripheral nerves and during axon regeneration, supporting conserved intrinsic regulation of peripherin during nerve outgrowth.\",\n      \"method\": \"Transgenic X. laevis with EGFP reporters driven by prph promoter/intron deletions, in vivo imaging during limb development and regeneration\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — deletion and motif analysis with in vivo reporter validation in ortholog, single lab\",\n      \"pmids\": [\"42145051\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Peripherin (PRPH) is a type III neuronal intermediate filament protein whose self-assembly into filamentous networks is required for normal cytoskeletal architecture in peripheral neurons; its expression is transcriptionally activated by Sp1 binding to a GC-rich promoter element and post-transcriptionally regulated by miR-9 and miR-105 targeting its 3'UTR, while its protein levels are controlled by gigaxonin-mediated ubiquitin-proteasome degradation such that gigaxonin loss causes peripherin accumulation and aggregation leading to neurodegeneration. In the cochlea, peripherin is essential for type II spiral ganglion neuron innervation of outer hair cells and thereby drives the afferent sensory arm of the medial olivocochlear efferent reflex that protects hearing. Pathogenic PRPH mutations (e.g., D141Y, 228delC) disrupt filament assembly and are linked to ALS, and a splice-donor loss-of-function variant causes sensory polyneuropathy. EV-A71 exploits surface and intracellular peripherin for CNS invasion via interactions with viral components and the host GTPase Rac1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Peripherin (PRPH) is a type III neuronal intermediate filament protein whose self-assembly into filamentous networks underlies cytoskeletal architecture in sensory and motor neurons, and disease-associated variants cause neurodegeneration by disrupting this assembly [#0, #1, #2]. Frameshift (228delC), missense (D141Y in the rod-domain linker), and splice-donor (c.996+1G>A) mutations all abolish normal filament formation in intermediate-filament-free cells, producing truncated species, aggregates, or punctate inclusions rather than networks, with the splice-donor loss-of-function allele linked to sensory polyneuropathy in homozygous carriers [#0, #1, #2]. Peripherin abundance is tightly controlled: it is transcriptionally activated by Sp1 binding to a GC-rich promoter element [#8], post-transcriptionally regulated by miR-9 and miR-105 targeting of its 3'UTR [#10], and turned over by gigaxonin-dependent degradation, such that loss of gigaxonin causes peripherin accumulation and aggregation in patient motor neurons and is sufficient to drive giant axons, neuroinflammation, and neuronal loss when peripherin is overexpressed in gigaxonin-null mice [#6, #7]. In the cochlea, peripherin is required for type II spiral ganglion neuron innervation of outer hair cells and thereby drives the afferent sensory arm of the medial olivocochlear efferent reflex that protects hearing from noise damage [#3, #4]. Peripherin is also exploited by Enterovirus-A71 for CNS invasion, with surface peripherin promoting viral entry and intracellular peripherin supporting genome replication through interactions with viral components and the host GTPase Rac1 [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established the genomic organization and candidate regulatory architecture of human PRPH, framing how tissue- and injury-specific expression might be controlled.\",\n      \"evidence\": \"Genomic sequencing and comparative analysis across human, rat, and mouse\",\n      \"pmids\": [\"7806235\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Regulatory elements identified only by sequence conservation, not experimentally validated\", \"No functional reporter test of the proposed NGF, Hox, or heat-shock elements\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identified a direct transcriptional activator of PRPH, answering how the gene is switched on at the promoter level.\",\n      \"evidence\": \"Gel retardation, methylation interference, supershift, and reporter co-transfection with Sp1 in vitro and in vivo\",\n      \"pmids\": [\"7622044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish how Sp1 activity is restricted to neurons\", \"Other promoter/intronic elements not dissected\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that PRPH coding mutations disrupt filament network assembly, providing the first mechanistic link between PRPH lesions and cytoskeletal disorganization.\",\n      \"evidence\": \"Transfection of 228delC and D141Y mutants in intermediate-filament-free cells with immunofluorescence; NF-L co-expression rescue attempt\",\n      \"pmids\": [\"15322088\", \"15446584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cellular overexpression system, not endogenous neurons\", \"Aggregate toxicity mechanism not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the in vivo spatial specificity of the PRPH promoter, showing it drives expression in sensory neurons and more limited motor neuron populations.\",\n      \"evidence\": \"BAC-EGFP knockin transgenic mice with fluorescence imaging and IHC\",\n      \"pmids\": [\"18709437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Promoter elements responsible for cell-type specificity not mapped\", \"Does not address protein function\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed PRPH within a degradation axis, showing gigaxonin controls peripherin protein levels and that gigaxonin loss is sufficient for peripherin aggregation.\",\n      \"evidence\": \"GAN patient iPSC-derived motor neurons with lentiviral gigaxonin rescue, Western blot, immunofluorescence\",\n      \"pmids\": [\"25398950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ubiquitination of peripherin by a gigaxonin-containing ligase not demonstrated biochemically\", \"Relationship between aggregation and neuronal death not established here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a discrete physiological role for peripherin in the auditory system, identifying it as required for type II SGN innervation of outer hair cells and the sensory arm of the olivocochlear reflex.\",\n      \"evidence\": \"Prph knockout mice with immunolabeling, ABR, DPOAE, and efferent suppression assays\",\n      \"pmids\": [\"25965946\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of why filament loss abolishes type II innervation unknown\", \"Does not distinguish developmental versus maintenance requirement\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified post-transcriptional control of peripherin, showing miR-9 and miR-105 regulate PRPH mRNA stability and are dysregulated in ALS.\",\n      \"evidence\": \"3'UTR luciferase reporters, endogenous mRNA stability assays, qPCR of ALS spinal cord\",\n      \"pmids\": [\"30385300\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal contribution of miRNA loss to ALS aggregation not demonstrated in vivo\", \"Single neuronal cell line for endogenous validation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked a human loss-of-function splice variant to disease and confirmed loss of filament-forming capacity, connecting PRPH dysfunction to sensory polyneuropathy.\",\n      \"evidence\": \"RNA/protein studies and filament assembly assay in IF-free cells plus population GWAS and neurological recall of homozygous carriers\",\n      \"pmids\": [\"30992453\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting filament loss to peripheral nerve pathology not resolved\", \"Penetrance and modifiers not characterized\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established peripherin as a host factor exploited by EV-A71 for CNS invasion, distinguishing entry and replication roles and identifying Rac1 as a partner.\",\n      \"evidence\": \"In vivo co-localization, siRNA/overexpression in motor neuron-like and neuroblastoma cells, viral entry/replication assays, Co-IP with viral components\",\n      \"pmids\": [\"33871166\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of peripherin-viral component interaction not defined\", \"Mechanism by which surface peripherin promotes entry unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated that peripherin accumulation is sufficient to cause neurodegeneration in the absence of gigaxonin, completing the gigaxonin-peripherin pathological axis.\",\n      \"evidence\": \"Prph overexpressor x Gan knockout double-mutant mice with histology, immunofluorescence, and behavior\",\n      \"pmids\": [\"37137704\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not isolate which downstream events (filament disorganization vs inflammation) drive neuronal loss\", \"Therapeutic reversibility not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical mechanism linking peripherin filament assembly to specific neuronal functions (type II SGN innervation, axon regeneration, sensory nerve maintenance) and the direct enzymology of its gigaxonin-dependent turnover remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of peripherin filament assembly or mutant aggregation\", \"Direct ubiquitin ligase biochemistry on peripherin not reconstituted\", \"Mechanistic coupling between filament integrity and synaptic/innervation phenotypes undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1, 13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"GAN\", \"RAC1\", \"SP1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}