{"gene":"NEFL","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1989,"finding":"NF-L and NF-M polypeptides, when expressed in non-neuronal fibroblasts (L cells), are competent to assemble into intermediate filament arrays in the absence of neuron-specific factors, and NF-L-containing filaments form copolymers with vimentin as judged by immunofluorescence and altered vimentin solubility.","method":"Transient and stable DNA transfection into L cells; immunofluorescence; solubility fractionation","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in heterologous cells with multiple orthogonal methods (immunofluorescence + biochemical fractionation)","pmids":["2493000"],"is_preprint":false},{"year":1985,"finding":"Porcine NF-L (NEFL) is a 548-residue protein (~62 kDa actual mass, ~68-72 kDa by gel electrophoresis) and sequence comparison reveals NF proteins are the most divergent members among non-epithelial intermediate filament proteins, with NF-L, NF-M, and NF-H sharing lower sequence identity with each other than do GFAP, desmin, and vimentin.","method":"Complete amino acid sequencing by protein chemistry; sequence comparison","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — complete primary structure determination by direct sequencing","pmids":["3920075"],"is_preprint":false},{"year":1998,"finding":"Rho-associated kinase (Rho-kinase) phosphorylates bovine NF-L in vitro at Ser-26 and Ser-57 in the head domain (~1 mol phosphate/mol NF-L), and this phosphorylation causes disassembly of 10-nm NF-L filaments.","method":"In vitro kinase assay; MALDI/TOF peptide mapping; electron microscopy of filaments","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with site identification by mass spectrometry and structural readout","pmids":["9571164"],"is_preprint":false},{"year":1996,"finding":"cAMP-dependent phosphorylation of NF-L or NF-M inhibits their coassembly into heteropolymer filaments in vitro, blocking a late stage of filament assembly while still permitting formation of heterooligomeric assembly intermediates.","method":"In vitro phosphorylation; sedimentation velocity; electron microscopy of reconstituted filaments","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution assay with biochemical and structural readouts","pmids":["8670258"],"is_preprint":false},{"year":2009,"finding":"Phosphorylation of the NFL head domain regulates axonal transport of neurofilaments: mutation of three or four phosphorylation sites to mimic permanent phosphorylation inhibits axonal transport and disrupts neurofilament assembly, while mutation to preclude phosphorylation has no effect on transport.","method":"Site-directed mutagenesis of NFL phosphorylation sites; live-cell axonal transport monitoring in neurons","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis combined with direct transport assay in neurons","pmids":["19147253"],"is_preprint":false},{"year":2009,"finding":"A homozygous nonsense mutation in NEFL (E210X) causes loss of function: the truncated protein fails to form an intermediate filament network and does not dominantly interfere with wild-type NF-L filament formation in SW-13 vim(-) cells; nerve biopsy shows absence of intermediate filaments in remaining axons, confirming neurofilaments as the main determinant of axonal caliber.","method":"Cell culture filament assembly assay in SW-13 vim(-) cells; sural nerve biopsy immunohistochemistry and electron microscopy","journal":"Annals of neurology","confidence":"High","confidence_rationale":"Tier 1–2 — cell-based reconstitution assay plus human nerve biopsy ultrastructure, establishing loss-of-function mechanism","pmids":["20039262"],"is_preprint":false},{"year":1991,"finding":"NF-L immunoreactivity defines a distinct subpopulation of large sensory neurons in rat dorsal root ganglia (DRG) that is peripherin-negative; a small population (~6%) co-expresses both NF-L and peripherin; this pattern is maintained in neonatal DRG cultures, establishing NF-L as a marker of large myelinated sensory neurons.","method":"Double immunofluorescence with anti-NF-L and anti-peripherin antibodies on DRG sections and cultures","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 3 — direct immunofluorescence localization with clear cell-type specificity, single study","pmids":["1795410"],"is_preprint":false},{"year":1995,"finding":"The rat NF-L gene promoter contains a cAMP-responsive element between -97 and -38 bp and an NGF-responsive element between -38 and +75 bp; NGF treatment induces up to 12-fold stimulation of NF-L promoter-driven expression in PC12 cells via transient binding of transcription factors to Sp1, AP-2, and CGCCCCCGC elements.","method":"Promoter-CAT reporter transfection assays; DNase I hypersensitivity mapping; gel-shift assays","journal":"Journal of neuroscience research","confidence":"High","confidence_rationale":"Tier 1 — functional promoter dissection with multiple deletion constructs and direct transcription factor binding assays","pmids":["7745611"],"is_preprint":false},{"year":2006,"finding":"14-3-3 proteins (beta, zeta, tau, gamma, eta isoforms) bind directly to the NEFL mRNA 3′ UTR at two hexanucleotide motifs identified by LC/MS/MS, and mutation of these motifs reduces 14-3-3 interaction and alters mRNA stability, establishing 14-3-3 as a regulator of NFL mRNA stability.","method":"LC/MS/MS peptide identification; in vitro RNA-binding assay; site-directed mutagenesis of UTR motifs; mRNA stability measurement","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 1 — mass spectrometry identification plus direct mutagenesis of binding sites with functional mRNA stability readout","pmids":["17098443"],"is_preprint":false},{"year":2010,"finding":"Human RGNEF (homologue of mouse p190RhoGEF) directly interacts with human NFL mRNA in vitro by gel shift assay; in ALS tissue lysates this interaction is detected by IP-RT-PCR, but not in control lysates, implicating RGNEF as an NFL mRNA stability regulator whose interaction is altered in ALS.","method":"Gel shift assay; IP-RT-PCR from tissue lysates; sequence homology analysis","journal":"Amyotrophic lateral sclerosis","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct RNA-binding demonstrated in vitro; tissue interaction shown by IP-RT-PCR, single lab","pmids":["19488899"],"is_preprint":false},{"year":2014,"finding":"Two novel microRNAs (miR-b1336 and miR-b2403) downregulated in ALS spinal cord stabilize NEFL mRNA as shown by reporter gene assay and RT-PCR; anti-miR treatment confirms direct effects, demonstrating post-transcriptional regulation of NEFL mRNA stability by specific miRNAs.","method":"Small RNA library sequencing; reporter gene (luciferase) assay; quantitative RT-PCR; anti-miR functional experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay plus anti-miR rescue, single lab with orthogonal methods","pmids":["24454911"],"is_preprint":false},{"year":1999,"finding":"βIISigma1-spectrin colocalizes with NF-L filament structures in SW13 Vim- cells transfected with full-length and C-terminal-deleted NF-L, and associates with actin; however, coimmunoprecipitation and yeast two-hybrid assays failed to demonstrate a direct NF-L–βIISigma1-spectrin interaction, suggesting an indirect association requiring a bridging protein.","method":"Transient transfection; double immunofluorescence; electron microscopy; co-immunoprecipitation; yeast two-hybrid","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods including negative controls establishing indirect interaction, single lab","pmids":["10388528"],"is_preprint":false},{"year":2016,"finding":"Small heat shock proteins HspB1 and HspB5 (αB-crystallin) bind to NFL and modulate its assembly: HspB1 decreases NFL in pellets, shifts NFL from pellet to supernatant, binds at saturation at ~1 mol HspB1 monomer per 2 mol NFL, and slows the rate of NFL polymerization; HspB6 and HspB8 are less effective; disease-linked HspB1 point mutants (G84R, L99M, R140G, K141Q, P182S) retain similar modulation of NFL assembly.","method":"Differential centrifugation; analytical ultracentrifugation; fluorescence spectroscopy of polymerization kinetics; interaction of recombinant proteins","journal":"Cell stress & chaperones","confidence":"High","confidence_rationale":"Tier 1 — multiple biophysical methods with quantitative binding stoichiometry and kinetic data in a single study","pmids":["28000086"],"is_preprint":false},{"year":2007,"finding":"CMT-linked mutations of MTMR2 (G103E, R283W) induce NFL aggregation in SW13 vim(-) cells and impair MTMR2 dimerization and phosphorylation, while MTM1 mutations also cause NFL assembly abnormalities; this establishes that MTMR2/MTM1 are required for normal NFL filament assembly.","method":"Expression in SW13 vim(-) cells; immunofluorescence; dimerization and phosphorylation assays","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — cell-based assembly assay with mutagenesis, single lab","pmids":["17973976"],"is_preprint":false},{"year":2013,"finding":"NEFL mutations in different functional domains have distinct effects on filament assembly: NEFL(Q333P) causes reversible misfolding and is susceptible to HSPA1 chaperoning, while NEFL(P8R) is sensitive to HSPB1 but not HSPA1; celastrol prevents NEFL(Q333P) inclusions and mitochondrial shortening in motor neurons but not sensory neurons, and vice versa for P8R.","method":"SW13-cell filament assembly assay; in vitro refolding; chaperone induction; live neuron imaging; celastrol treatment","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — cell-based reconstitution with mutagenesis and chaperone intervention, single lab with multiple readouts","pmids":["23618875"],"is_preprint":false},{"year":2009,"finding":"In NFL-/- mice, axotomy leads to delayed and persistent cytosolic TDP-43 upregulation and sustained downregulation of neuronal PGRN, accompanied by caspase-3 activation on post-injury day 28 and subsequent neuronal death, establishing that NFL is required for normal TDP-43 localization and neuronal survival responses after axotomy.","method":"Axotomy in NFL-/- knockout mice; immunohistochemistry for TDP-43, PGRN, caspase-3; behavioral assessment","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic knockout with defined molecular and cellular phenotype, single study","pmids":["19619516"],"is_preprint":false},{"year":2005,"finding":"NFL-/- mice develop mild sensorimotor dysfunction (fewer rears, beam crossing deficits, grip failures) and spatial learning deficits in the Morris water maze by 6 months, correlated with increased cytochrome oxidase activity in cerebellum and brainstem, establishing NFL as required for normal sensorimotor and spatial function.","method":"Nefl gene knockout mice; behavioral battery (open field, stationary beam, suspended bar, Morris water maze); quantitative cytochrome oxidase histochemistry","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic knockout with defined behavioral and metabolic phenotypes, single study","pmids":["15884021"],"is_preprint":false},{"year":2018,"finding":"Recessive nonsense mutations in NEFL cause nearly complete loss of NEFL mRNA via nonsense-mediated decay (NMD), leading to total absence of NEFL protein in patient-derived iPSC motor neurons, yet neurons can still differentiate and form neurofilaments, demonstrating a loss-of-function mechanism for recessive CMT; partial rescue of NEFL mRNA by NMD inhibition confirms the mechanism.","method":"iPSC-derived motor neurons; qPCR; Western blot; immunocytochemistry; electron microscopy; single-cell transcriptomics; NMD inhibitor rescue","journal":"Neurology. Genetics","confidence":"High","confidence_rationale":"Tier 1–2 — patient-specific iPSC neurons with multiple orthogonal methods and pharmacological rescue confirming mechanism","pmids":["29888333"],"is_preprint":false},{"year":1997,"finding":"NF-M and NF-L mRNAs are transiently and coordinately induced in Schwann cells during Wallerian degeneration (dedifferentiation) and during early differentiation of myelin-forming Schwann cells in vivo; however, translation of these mRNAs is restricted to Schwann cells deprived of axonal contact, demonstrating axonal contact as a post-transcriptional regulator of NF-L/NF-M protein expression in Schwann cells.","method":"In situ hybridization; immunohistochemistry; Northern blot analysis of peripheral nerve at defined developmental and injury time points","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo localization/expression study with developmental and injury time courses, single lab","pmids":["9373038"],"is_preprint":false},{"year":2015,"finding":"miR-381 directly targets NEFL mRNA to suppress its expression; either suppressing miR-381 or overexpressing NEFL sensitizes glioblastoma cells to temozolomide by inhibiting multidrug resistance factors (ABCG2, ABCC3, ABCC5) and stemness factors (ALDH1, CD44, CKIT, KLF4, Nanog, Nestin, SOX2); NEFL-siRNA reverses NEFL-mediated TMZ sensitization.","method":"2-D DIGE proteomics; MALDI-TOF/TOF-MS/MS; miR-381 inhibition/overexpression; NEFL overexpression/siRNA; cell viability assays; Western blot","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics target identification plus functional rescue experiments, single lab","pmids":["25605243"],"is_preprint":false},{"year":2015,"finding":"miR-25 directly targets NEFL and suppresses its expression in glioblastoma; NEFL knockdown via siRNA attenuates the growth-inhibitory effects of miR-25 knockdown on U251 cell proliferation and invasion via the mTOR signaling pathway.","method":"miR-25 overexpression/inhibition; NEFL siRNA; cell proliferation and invasion assays; Western blot; mTOR pathway analysis","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 — direct target validation with epistasis via siRNA rescue, single lab","pmids":["26209061"],"is_preprint":false},{"year":2009,"finding":"In NFL-/- mice (a model of motor neuron degeneration), degenerating spinal motor neurons exhibit early upregulation of the C5a anaphylatoxin receptor (C5aR); C5a is neurotoxic to Neuro2A and NGF-differentiated PC12 cells in vitro; kainate and C5a both upregulate activated C5aR expression, suggesting C5aR upregulation in the absence of NFL potentiates excitotoxicity.","method":"NFL-/- knockout mouse immunohistochemistry; in vitro neurotoxicity assays; C5aR expression analysis","journal":"Journal of neuroimmunology","confidence":"Medium","confidence_rationale":"Tier 2–3 — genetic knockout model with in vitro mechanistic follow-up, single lab","pmids":["19286267"],"is_preprint":false},{"year":2013,"finding":"NEFL promoter hypermethylation causes its downregulation in breast cancer cell lines and tissues; demethylation treatment restores NEFL expression in MDA-MB-231 cells, establishing promoter methylation as a mechanism of NEFL silencing in cancer.","method":"Genome-wide methylation analysis; bisulfite sequencing; RT-PCR; demethylation (5-azacytidine) rescue experiment","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 — genome-wide discovery plus direct demethylation rescue confirming mechanism, single lab","pmids":["24026393"],"is_preprint":false}],"current_model":"NEFL (neurofilament light chain) is a neuron-specific intermediate filament subunit that self-assembles and co-assembles with NF-M and NF-H into 10-nm filaments; head-domain phosphorylation (by Rho-kinase at Ser-26/Ser-57, and by cAMP-dependent kinase) disassembles filaments and inhibits co-assembly, while also regulating axonal transport of the neurofilament polymer; small heat shock proteins (HspB1, HspB5) bind NFL and modulate its polymerization; NFL mRNA stability is post-transcriptionally regulated by 14-3-3 proteins and specific microRNAs binding the 3′ UTR; recessive loss-of-function mutations cause early-onset CMT neuropathy through NMD-mediated mRNA depletion and consequent absence of neurofilaments in axons, while dominant missense mutations in the head or rod domains cause misassembly and aggregate formation underlying autosomal dominant CMT; NFL is required for normal axonal caliber, neurofilament-dependent axonal transport, and sensorimotor function, and its absence in neurons triggers aberrant TDP-43 localization and caspase-3-dependent cell death after injury."},"narrative":{"teleology":[{"year":1985,"claim":"Determining the complete primary structure of NF-L revealed it as a divergent intermediate filament family member, establishing the sequence framework for all subsequent structure–function studies.","evidence":"Complete amino acid sequencing of porcine NF-L by protein chemistry","pmids":["3920075"],"confidence":"High","gaps":["Three-dimensional structure not determined","Post-translational modification sites not yet mapped"]},{"year":1989,"claim":"Reconstitution of NF-L filament assembly in non-neuronal cells demonstrated that NF-L is intrinsically competent to form 10-nm filaments and can copolymerize with vimentin, resolving whether neuron-specific cofactors were required.","evidence":"Transfection of NF-L into L cells; immunofluorescence and solubility fractionation","pmids":["2493000"],"confidence":"High","gaps":["Stoichiometry of NF-L/vimentin copolymers undefined","Regulation of assembly not addressed"]},{"year":1995,"claim":"Functional dissection of the NF-L promoter identified cAMP- and NGF-responsive elements, establishing the transcriptional control architecture driving neuron-specific NF-L expression.","evidence":"Promoter-CAT reporter assays, DNase I footprinting, and gel-shift in PC12 cells","pmids":["7745611"],"confidence":"High","gaps":["In vivo chromatin context not examined","Upstream signaling cascades linking NGF receptor to these elements not fully mapped"]},{"year":1996,"claim":"Demonstrating that cAMP-dependent phosphorylation blocks a late stage of NF-L/NF-M coassembly established head-domain phosphorylation as a key negative regulator of neurofilament polymerization.","evidence":"In vitro phosphorylation with sedimentation and electron microscopy of reconstituted filaments","pmids":["8670258"],"confidence":"High","gaps":["Identity of the specific kinase(s) acting in vivo not determined","Phosphorylation site(s) not mapped in this study"]},{"year":1998,"claim":"Identification of Rho-kinase phosphorylation at Ser-26 and Ser-57 as sufficient for filament disassembly provided the first site-specific mechanism linking a signaling pathway to neurofilament dynamics.","evidence":"In vitro kinase assay with MALDI-TOF site identification and EM of disassembled filaments","pmids":["9571164"],"confidence":"High","gaps":["In vivo relevance of Rho-kinase phosphorylation at these sites not confirmed","Whether dephosphorylation reverses disassembly not tested"]},{"year":2005,"claim":"NFL knockout mice revealed that loss of NF-L is sufficient to cause sensorimotor dysfunction and spatial learning deficits, establishing NF-L as required for normal neuronal function beyond structural support.","evidence":"Behavioral battery and cytochrome oxidase histochemistry in Nefl−/− mice","pmids":["15884021"],"confidence":"Medium","gaps":["Mechanism linking NF-L loss to metabolic and cognitive changes unclear","Single laboratory study"]},{"year":2006,"claim":"Discovery that 14-3-3 proteins bind NEFL mRNA 3′ UTR hexanucleotide motifs and regulate mRNA stability revealed a post-transcriptional layer of NF-L regulation independent of transcription or phosphorylation.","evidence":"LC/MS/MS identification of 14-3-3 on NEFL 3′ UTR; mutagenesis of binding motifs with mRNA stability readout","pmids":["17098443"],"confidence":"High","gaps":["Physiological conditions triggering 14-3-3 binding changes unknown","Downstream decay machinery not identified"]},{"year":2009,"claim":"Phosphomimetic mutations at head-domain sites blocked axonal transport in living neurons, directly linking NF-L phosphorylation state to neurofilament motility and not just assembly.","evidence":"Site-directed mutagenesis with live-cell axonal transport imaging in cultured neurons","pmids":["19147253"],"confidence":"High","gaps":["Motor protein(s) affected by phosphorylation state not identified","Contribution of individual sites not resolved"]},{"year":2009,"claim":"The finding that a homozygous NEFL nonsense mutation (E210X) abolishes filament network formation without dominant-negative effects, combined with absent neurofilaments and reduced axonal caliber in patient nerve, established a loss-of-function basis for recessive CMT neuropathy.","evidence":"SW13 vim(−) cell assembly assay and sural nerve biopsy ultrastructure from an affected patient","pmids":["20039262"],"confidence":"High","gaps":["Whether other recessive mutations share identical mechanism not tested","Degree of NF-M/NF-H compensation unclear"]},{"year":2009,"claim":"NFL−/− mice showed aberrant cytosolic TDP-43 accumulation and caspase-3-dependent neuronal death after axotomy, revealing NF-L as a determinant of TDP-43 localization and neuronal survival after injury.","evidence":"Axotomy in Nefl−/− mice with immunohistochemistry for TDP-43, PGRN, and caspase-3","pmids":["19619516"],"confidence":"Medium","gaps":["Direct physical interaction between NF-L and TDP-43 not demonstrated","Mechanism connecting NF-L absence to TDP-43 mislocalization unknown","Single laboratory study"]},{"year":2013,"claim":"Demonstration that domain-specific NEFL mutations (Q333P vs P8R) are differentially rescued by distinct chaperones (HSPA1 vs HSPB1) established that CMT-linked mutations cause structurally distinct misfolding defects.","evidence":"SW13 cell assembly assay, in vitro refolding, chaperone induction, and live motor neuron imaging","pmids":["23618875"],"confidence":"Medium","gaps":["Structural basis of differential chaperone sensitivity not resolved","In vivo therapeutic potential of chaperone induction not tested"]},{"year":2016,"claim":"Quantitative biophysical analysis of HspB1 and HspB5 binding to NFL at defined stoichiometry (~1:2 HspB1:NFL) and kinetic slowing of polymerization established small heat shock proteins as direct modulators of neurofilament assembly dynamics.","evidence":"Differential centrifugation, analytical ultracentrifugation, and fluorescence polymerization kinetics with recombinant proteins","pmids":["28000086"],"confidence":"High","gaps":["In vivo stoichiometry and regulation of sHsp–NFL interaction unknown","Effect on mixed NF-L/NF-M/NF-H filaments not tested"]},{"year":2018,"claim":"Patient iPSC-derived motor neurons confirmed that recessive NEFL nonsense mutations cause near-complete mRNA loss via NMD, with pharmacological NMD inhibition partially rescuing NEFL mRNA, definitively establishing the molecular mechanism of recessive NEFL-CMT.","evidence":"iPSC motor neurons; qPCR, Western blot, EM, single-cell transcriptomics, NMD inhibitor rescue","pmids":["29888333"],"confidence":"High","gaps":["Whether NMD inhibition can restore sufficient protein for functional rescue in vivo unknown","Long-term consequences of partial NEFL restoration not assessed"]},{"year":null,"claim":"The structural basis of NF-L assembly and the identity of motor proteins whose interaction with neurofilaments is regulated by head-domain phosphorylation remain unresolved, as does the mechanism by which NF-L loss leads to TDP-43 mislocalization.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of assembled NF-L filament","Motor adaptor linking phosphorylation to transport not identified","Direct NF-L–TDP-43 interaction not tested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,5]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,5,6]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,7,16]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,15,16,17]}],"complexes":["neurofilament (NF-L/NF-M/NF-H)"],"partners":["NEFM","VIM","HSPB1","CRYAB","YWHAB","MTMR2"],"other_free_text":[]},"mechanistic_narrative":"NEFL encodes neurofilament light chain, the obligate backbone subunit of neuronal 10-nm intermediate filaments that is essential for axonal caliber, neurofilament-dependent axonal transport, and sensorimotor function. NF-L self-assembles and co-assembles with NF-M into heteropolymer filaments, a process negatively regulated by head-domain phosphorylation at Ser-26/Ser-57 by Rho-kinase and by cAMP-dependent kinase, and positively modulated by small heat shock proteins HspB1 and HspB5 that slow polymerization kinetics [PMID:9571164, PMID:8670258, PMID:28000086, PMID:19147253]. NEFL mRNA stability is post-transcriptionally controlled by 14-3-3 protein binding to 3′ UTR hexanucleotide motifs and by specific microRNAs including miR-381 and miR-25 [PMID:17098443, PMID:25605243, PMID:26209061]. Recessive nonsense mutations cause NMD-mediated mRNA depletion and complete absence of neurofilaments, while dominant missense mutations in distinct domains produce filament misassembly and aggregation, both mechanisms underlying Charcot–Marie–Tooth neuropathy [PMID:29888333, PMID:20039262, PMID:23618875]."},"prefetch_data":{"uniprot":{"accession":"P07196","full_name":"Neurofilament light polypeptide","aliases":["68 kDa neurofilament protein","Neurofilament triplet L protein"],"length_aa":543,"mass_kda":61.5,"function":"Neurofilaments usually contain three intermediate filament proteins: NEFL, NEFM, and NEFH which are involved in the maintenance of neuronal caliber. May additionally cooperate with the neuronal intermediate filament proteins PRPH and INA to form neuronal filamentous networks (By similarity)","subcellular_location":"Cell projection, axon; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/P07196/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NEFL","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":74,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"VIM","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NEFL","total_profiled":1310},"omim":[{"mim_id":"620461","title":"ENCEPHALITIS, ACUTE, INFECTION-INDUCED, SUSCEPTIBILITY TO, 12; IIAE12","url":"https://www.omim.org/entry/620461"},{"mim_id":"617882","title":"CHARCOT-MARIE-TOOTH DISEASE, DOMINANT INTERMEDIATE G; CMTDIG","url":"https://www.omim.org/entry/617882"},{"mim_id":"616924","title":"CHARCOT-MARIE-TOOTH DISEASE, AXONAL, TYPE 2CC; CMT2CC","url":"https://www.omim.org/entry/616924"},{"mim_id":"614141","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 2; TRIM2","url":"https://www.omim.org/entry/614141"},{"mim_id":"610100","title":"GIANT AXONAL NEUROPATHY 2, AUTOSOMAL DOMINANT; GAN2","url":"https://www.omim.org/entry/610100"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Intermediate filaments","reliability":"Approved"},{"location":"Midbody","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":298.8},{"tissue":"retina","ntpm":82.9}],"url":"https://www.proteinatlas.org/search/NEFL"},"hgnc":{"alias_symbol":["NFL","CMT1F","CMT2E","NF68","PPP1R110"],"prev_symbol":[]},"alphafold":{"accession":"P07196","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07196","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07196-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07196-F1-predicted_aligned_error_v6.png","plddt_mean":73.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NEFL","jax_strain_url":"https://www.jax.org/strain/search?query=NEFL"},"sequence":{"accession":"P07196","fasta_url":"https://rest.uniprot.org/uniprotkb/P07196.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07196/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07196"}},"corpus_meta":[{"pmid":"28179466","id":"PMC_28179466","title":"Blood-based NfL: A biomarker for differential diagnosis of parkinsonian disorder.","date":"2017","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/28179466","citation_count":397,"is_preprint":false},{"pmid":"26870824","id":"PMC_26870824","title":"Plasma Concentration of the Neurofilament Light Protein (NFL) is a Biomarker of CNS Injury in HIV Infection: A Cross-Sectional Study.","date":"2015","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/26870824","citation_count":381,"is_preprint":false},{"pmid":"36574591","id":"PMC_36574591","title":"Plasma Aβ42/40 ratio, p-tau181, GFAP, and NfL across the Alzheimer's disease continuum: A cross-sectional and longitudinal study in the AIBL cohort.","date":"2022","source":"Alzheimer's & dementia : the journal of the Alzheimer's Association","url":"https://pubmed.ncbi.nlm.nih.gov/36574591","citation_count":233,"is_preprint":false},{"pmid":"12566280","id":"PMC_12566280","title":"Mutations in the neurofilament light chain gene (NEFL) cause early onset severe 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Effects on regional brain metabolism.","date":"2005","source":"Journal of neuroscience research","url":"https://pubmed.ncbi.nlm.nih.gov/15742362","citation_count":12,"is_preprint":false},{"pmid":"24026393","id":"PMC_24026393","title":"Stage-specific methylome screen identifies that NEFL is downregulated by promoter hypermethylation in breast cancer.","date":"2013","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/24026393","citation_count":12,"is_preprint":false},{"pmid":"32477099","id":"PMC_32477099","title":"Increased CSF NFL in Non-demented Parkinson's Disease Subjects Reflects Early White Matter Damage.","date":"2020","source":"Frontiers in aging neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/32477099","citation_count":12,"is_preprint":false},{"pmid":"35044100","id":"PMC_35044100","title":"Phenotypic heterogeneity in patients with NEFL-related Charcot-Marie-Tooth disease.","date":"2022","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35044100","citation_count":11,"is_preprint":false},{"pmid":"36282532","id":"PMC_36282532","title":"MiR-30b-5p attenuates the inflammatory response and facilitates the functional recovery of spinal cord injury by targeting the NEFL/mTOR pathway.","date":"2022","source":"Brain and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/36282532","citation_count":11,"is_preprint":false},{"pmid":"40009787","id":"PMC_40009787","title":"Comparative Performances of 4 Serum NfL Assays, pTau181, and GFAP in Patients With Amyotrophic Lateral Sclerosis.","date":"2025","source":"Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/40009787","citation_count":11,"is_preprint":false},{"pmid":"35287127","id":"PMC_35287127","title":"Plasma Cystatin C Correlates with Plasma NfL Levels and Predicts Disease Progression in Parkinson's Disease.","date":"2022","source":"Neuro-degenerative diseases","url":"https://pubmed.ncbi.nlm.nih.gov/35287127","citation_count":11,"is_preprint":false},{"pmid":"37003244","id":"PMC_37003244","title":"Changes in neurofilament light chain protein (NEFL) in children and adolescents with Schizophrenia and Bipolar Disorder: Early period neurodegeneration.","date":"2023","source":"Journal of psychiatric research","url":"https://pubmed.ncbi.nlm.nih.gov/37003244","citation_count":11,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":55107,"output_tokens":5489,"usd":0.123828},"stage2":{"model":"claude-opus-4-6","input_tokens":9061,"output_tokens":2912,"usd":0.177157},"total_usd":0.300985,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"NF-L and NF-M polypeptides, when expressed in non-neuronal fibroblasts (L cells), are competent to assemble into intermediate filament arrays in the absence of neuron-specific factors, and NF-L-containing filaments form copolymers with vimentin as judged by immunofluorescence and altered vimentin solubility.\",\n      \"method\": \"Transient and stable DNA transfection into L cells; immunofluorescence; solubility fractionation\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in heterologous cells with multiple orthogonal methods (immunofluorescence + biochemical fractionation)\",\n      \"pmids\": [\"2493000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"Porcine NF-L (NEFL) is a 548-residue protein (~62 kDa actual mass, ~68-72 kDa by gel electrophoresis) and sequence comparison reveals NF proteins are the most divergent members among non-epithelial intermediate filament proteins, with NF-L, NF-M, and NF-H sharing lower sequence identity with each other than do GFAP, desmin, and vimentin.\",\n      \"method\": \"Complete amino acid sequencing by protein chemistry; sequence comparison\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — complete primary structure determination by direct sequencing\",\n      \"pmids\": [\"3920075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Rho-associated kinase (Rho-kinase) phosphorylates bovine NF-L in vitro at Ser-26 and Ser-57 in the head domain (~1 mol phosphate/mol NF-L), and this phosphorylation causes disassembly of 10-nm NF-L filaments.\",\n      \"method\": \"In vitro kinase assay; MALDI/TOF peptide mapping; electron microscopy of filaments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with site identification by mass spectrometry and structural readout\",\n      \"pmids\": [\"9571164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"cAMP-dependent phosphorylation of NF-L or NF-M inhibits their coassembly into heteropolymer filaments in vitro, blocking a late stage of filament assembly while still permitting formation of heterooligomeric assembly intermediates.\",\n      \"method\": \"In vitro phosphorylation; sedimentation velocity; electron microscopy of reconstituted filaments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution assay with biochemical and structural readouts\",\n      \"pmids\": [\"8670258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Phosphorylation of the NFL head domain regulates axonal transport of neurofilaments: mutation of three or four phosphorylation sites to mimic permanent phosphorylation inhibits axonal transport and disrupts neurofilament assembly, while mutation to preclude phosphorylation has no effect on transport.\",\n      \"method\": \"Site-directed mutagenesis of NFL phosphorylation sites; live-cell axonal transport monitoring in neurons\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis combined with direct transport assay in neurons\",\n      \"pmids\": [\"19147253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A homozygous nonsense mutation in NEFL (E210X) causes loss of function: the truncated protein fails to form an intermediate filament network and does not dominantly interfere with wild-type NF-L filament formation in SW-13 vim(-) cells; nerve biopsy shows absence of intermediate filaments in remaining axons, confirming neurofilaments as the main determinant of axonal caliber.\",\n      \"method\": \"Cell culture filament assembly assay in SW-13 vim(-) cells; sural nerve biopsy immunohistochemistry and electron microscopy\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — cell-based reconstitution assay plus human nerve biopsy ultrastructure, establishing loss-of-function mechanism\",\n      \"pmids\": [\"20039262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"NF-L immunoreactivity defines a distinct subpopulation of large sensory neurons in rat dorsal root ganglia (DRG) that is peripherin-negative; a small population (~6%) co-expresses both NF-L and peripherin; this pattern is maintained in neonatal DRG cultures, establishing NF-L as a marker of large myelinated sensory neurons.\",\n      \"method\": \"Double immunofluorescence with anti-NF-L and anti-peripherin antibodies on DRG sections and cultures\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct immunofluorescence localization with clear cell-type specificity, single study\",\n      \"pmids\": [\"1795410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The rat NF-L gene promoter contains a cAMP-responsive element between -97 and -38 bp and an NGF-responsive element between -38 and +75 bp; NGF treatment induces up to 12-fold stimulation of NF-L promoter-driven expression in PC12 cells via transient binding of transcription factors to Sp1, AP-2, and CGCCCCCGC elements.\",\n      \"method\": \"Promoter-CAT reporter transfection assays; DNase I hypersensitivity mapping; gel-shift assays\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional promoter dissection with multiple deletion constructs and direct transcription factor binding assays\",\n      \"pmids\": [\"7745611\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"14-3-3 proteins (beta, zeta, tau, gamma, eta isoforms) bind directly to the NEFL mRNA 3′ UTR at two hexanucleotide motifs identified by LC/MS/MS, and mutation of these motifs reduces 14-3-3 interaction and alters mRNA stability, establishing 14-3-3 as a regulator of NFL mRNA stability.\",\n      \"method\": \"LC/MS/MS peptide identification; in vitro RNA-binding assay; site-directed mutagenesis of UTR motifs; mRNA stability measurement\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mass spectrometry identification plus direct mutagenesis of binding sites with functional mRNA stability readout\",\n      \"pmids\": [\"17098443\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human RGNEF (homologue of mouse p190RhoGEF) directly interacts with human NFL mRNA in vitro by gel shift assay; in ALS tissue lysates this interaction is detected by IP-RT-PCR, but not in control lysates, implicating RGNEF as an NFL mRNA stability regulator whose interaction is altered in ALS.\",\n      \"method\": \"Gel shift assay; IP-RT-PCR from tissue lysates; sequence homology analysis\",\n      \"journal\": \"Amyotrophic lateral sclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct RNA-binding demonstrated in vitro; tissue interaction shown by IP-RT-PCR, single lab\",\n      \"pmids\": [\"19488899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Two novel microRNAs (miR-b1336 and miR-b2403) downregulated in ALS spinal cord stabilize NEFL mRNA as shown by reporter gene assay and RT-PCR; anti-miR treatment confirms direct effects, demonstrating post-transcriptional regulation of NEFL mRNA stability by specific miRNAs.\",\n      \"method\": \"Small RNA library sequencing; reporter gene (luciferase) assay; quantitative RT-PCR; anti-miR functional experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay plus anti-miR rescue, single lab with orthogonal methods\",\n      \"pmids\": [\"24454911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"βIISigma1-spectrin colocalizes with NF-L filament structures in SW13 Vim- cells transfected with full-length and C-terminal-deleted NF-L, and associates with actin; however, coimmunoprecipitation and yeast two-hybrid assays failed to demonstrate a direct NF-L–βIISigma1-spectrin interaction, suggesting an indirect association requiring a bridging protein.\",\n      \"method\": \"Transient transfection; double immunofluorescence; electron microscopy; co-immunoprecipitation; yeast two-hybrid\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including negative controls establishing indirect interaction, single lab\",\n      \"pmids\": [\"10388528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Small heat shock proteins HspB1 and HspB5 (αB-crystallin) bind to NFL and modulate its assembly: HspB1 decreases NFL in pellets, shifts NFL from pellet to supernatant, binds at saturation at ~1 mol HspB1 monomer per 2 mol NFL, and slows the rate of NFL polymerization; HspB6 and HspB8 are less effective; disease-linked HspB1 point mutants (G84R, L99M, R140G, K141Q, P182S) retain similar modulation of NFL assembly.\",\n      \"method\": \"Differential centrifugation; analytical ultracentrifugation; fluorescence spectroscopy of polymerization kinetics; interaction of recombinant proteins\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple biophysical methods with quantitative binding stoichiometry and kinetic data in a single study\",\n      \"pmids\": [\"28000086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CMT-linked mutations of MTMR2 (G103E, R283W) induce NFL aggregation in SW13 vim(-) cells and impair MTMR2 dimerization and phosphorylation, while MTM1 mutations also cause NFL assembly abnormalities; this establishes that MTMR2/MTM1 are required for normal NFL filament assembly.\",\n      \"method\": \"Expression in SW13 vim(-) cells; immunofluorescence; dimerization and phosphorylation assays\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — cell-based assembly assay with mutagenesis, single lab\",\n      \"pmids\": [\"17973976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NEFL mutations in different functional domains have distinct effects on filament assembly: NEFL(Q333P) causes reversible misfolding and is susceptible to HSPA1 chaperoning, while NEFL(P8R) is sensitive to HSPB1 but not HSPA1; celastrol prevents NEFL(Q333P) inclusions and mitochondrial shortening in motor neurons but not sensory neurons, and vice versa for P8R.\",\n      \"method\": \"SW13-cell filament assembly assay; in vitro refolding; chaperone induction; live neuron imaging; celastrol treatment\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-based reconstitution with mutagenesis and chaperone intervention, single lab with multiple readouts\",\n      \"pmids\": [\"23618875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In NFL-/- mice, axotomy leads to delayed and persistent cytosolic TDP-43 upregulation and sustained downregulation of neuronal PGRN, accompanied by caspase-3 activation on post-injury day 28 and subsequent neuronal death, establishing that NFL is required for normal TDP-43 localization and neuronal survival responses after axotomy.\",\n      \"method\": \"Axotomy in NFL-/- knockout mice; immunohistochemistry for TDP-43, PGRN, caspase-3; behavioral assessment\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with defined molecular and cellular phenotype, single study\",\n      \"pmids\": [\"19619516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"NFL-/- mice develop mild sensorimotor dysfunction (fewer rears, beam crossing deficits, grip failures) and spatial learning deficits in the Morris water maze by 6 months, correlated with increased cytochrome oxidase activity in cerebellum and brainstem, establishing NFL as required for normal sensorimotor and spatial function.\",\n      \"method\": \"Nefl gene knockout mice; behavioral battery (open field, stationary beam, suspended bar, Morris water maze); quantitative cytochrome oxidase histochemistry\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockout with defined behavioral and metabolic phenotypes, single study\",\n      \"pmids\": [\"15884021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Recessive nonsense mutations in NEFL cause nearly complete loss of NEFL mRNA via nonsense-mediated decay (NMD), leading to total absence of NEFL protein in patient-derived iPSC motor neurons, yet neurons can still differentiate and form neurofilaments, demonstrating a loss-of-function mechanism for recessive CMT; partial rescue of NEFL mRNA by NMD inhibition confirms the mechanism.\",\n      \"method\": \"iPSC-derived motor neurons; qPCR; Western blot; immunocytochemistry; electron microscopy; single-cell transcriptomics; NMD inhibitor rescue\",\n      \"journal\": \"Neurology. Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — patient-specific iPSC neurons with multiple orthogonal methods and pharmacological rescue confirming mechanism\",\n      \"pmids\": [\"29888333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"NF-M and NF-L mRNAs are transiently and coordinately induced in Schwann cells during Wallerian degeneration (dedifferentiation) and during early differentiation of myelin-forming Schwann cells in vivo; however, translation of these mRNAs is restricted to Schwann cells deprived of axonal contact, demonstrating axonal contact as a post-transcriptional regulator of NF-L/NF-M protein expression in Schwann cells.\",\n      \"method\": \"In situ hybridization; immunohistochemistry; Northern blot analysis of peripheral nerve at defined developmental and injury time points\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo localization/expression study with developmental and injury time courses, single lab\",\n      \"pmids\": [\"9373038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-381 directly targets NEFL mRNA to suppress its expression; either suppressing miR-381 or overexpressing NEFL sensitizes glioblastoma cells to temozolomide by inhibiting multidrug resistance factors (ABCG2, ABCC3, ABCC5) and stemness factors (ALDH1, CD44, CKIT, KLF4, Nanog, Nestin, SOX2); NEFL-siRNA reverses NEFL-mediated TMZ sensitization.\",\n      \"method\": \"2-D DIGE proteomics; MALDI-TOF/TOF-MS/MS; miR-381 inhibition/overexpression; NEFL overexpression/siRNA; cell viability assays; Western blot\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics target identification plus functional rescue experiments, single lab\",\n      \"pmids\": [\"25605243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"miR-25 directly targets NEFL and suppresses its expression in glioblastoma; NEFL knockdown via siRNA attenuates the growth-inhibitory effects of miR-25 knockdown on U251 cell proliferation and invasion via the mTOR signaling pathway.\",\n      \"method\": \"miR-25 overexpression/inhibition; NEFL siRNA; cell proliferation and invasion assays; Western blot; mTOR pathway analysis\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — direct target validation with epistasis via siRNA rescue, single lab\",\n      \"pmids\": [\"26209061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In NFL-/- mice (a model of motor neuron degeneration), degenerating spinal motor neurons exhibit early upregulation of the C5a anaphylatoxin receptor (C5aR); C5a is neurotoxic to Neuro2A and NGF-differentiated PC12 cells in vitro; kainate and C5a both upregulate activated C5aR expression, suggesting C5aR upregulation in the absence of NFL potentiates excitotoxicity.\",\n      \"method\": \"NFL-/- knockout mouse immunohistochemistry; in vitro neurotoxicity assays; C5aR expression analysis\",\n      \"journal\": \"Journal of neuroimmunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — genetic knockout model with in vitro mechanistic follow-up, single lab\",\n      \"pmids\": [\"19286267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NEFL promoter hypermethylation causes its downregulation in breast cancer cell lines and tissues; demethylation treatment restores NEFL expression in MDA-MB-231 cells, establishing promoter methylation as a mechanism of NEFL silencing in cancer.\",\n      \"method\": \"Genome-wide methylation analysis; bisulfite sequencing; RT-PCR; demethylation (5-azacytidine) rescue experiment\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide discovery plus direct demethylation rescue confirming mechanism, single lab\",\n      \"pmids\": [\"24026393\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NEFL (neurofilament light chain) is a neuron-specific intermediate filament subunit that self-assembles and co-assembles with NF-M and NF-H into 10-nm filaments; head-domain phosphorylation (by Rho-kinase at Ser-26/Ser-57, and by cAMP-dependent kinase) disassembles filaments and inhibits co-assembly, while also regulating axonal transport of the neurofilament polymer; small heat shock proteins (HspB1, HspB5) bind NFL and modulate its polymerization; NFL mRNA stability is post-transcriptionally regulated by 14-3-3 proteins and specific microRNAs binding the 3′ UTR; recessive loss-of-function mutations cause early-onset CMT neuropathy through NMD-mediated mRNA depletion and consequent absence of neurofilaments in axons, while dominant missense mutations in the head or rod domains cause misassembly and aggregate formation underlying autosomal dominant CMT; NFL is required for normal axonal caliber, neurofilament-dependent axonal transport, and sensorimotor function, and its absence in neurons triggers aberrant TDP-43 localization and caspase-3-dependent cell death after injury.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NEFL encodes neurofilament light chain, the obligate backbone subunit of neuronal 10-nm intermediate filaments that is essential for axonal caliber, neurofilament-dependent axonal transport, and sensorimotor function. NF-L self-assembles and co-assembles with NF-M into heteropolymer filaments, a process negatively regulated by head-domain phosphorylation at Ser-26/Ser-57 by Rho-kinase and by cAMP-dependent kinase, and positively modulated by small heat shock proteins HspB1 and HspB5 that slow polymerization kinetics [PMID:9571164, PMID:8670258, PMID:28000086, PMID:19147253]. NEFL mRNA stability is post-transcriptionally controlled by 14-3-3 protein binding to 3′ UTR hexanucleotide motifs and by specific microRNAs including miR-381 and miR-25 [PMID:17098443, PMID:25605243, PMID:26209061]. Recessive nonsense mutations cause NMD-mediated mRNA depletion and complete absence of neurofilaments, while dominant missense mutations in distinct domains produce filament misassembly and aggregation, both mechanisms underlying Charcot–Marie–Tooth neuropathy [PMID:29888333, PMID:20039262, PMID:23618875].\",\n  \"teleology\": [\n    {\n      \"year\": 1985,\n      \"claim\": \"Determining the complete primary structure of NF-L revealed it as a divergent intermediate filament family member, establishing the sequence framework for all subsequent structure–function studies.\",\n      \"evidence\": \"Complete amino acid sequencing of porcine NF-L by protein chemistry\",\n      \"pmids\": [\"3920075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Three-dimensional structure not determined\", \"Post-translational modification sites not yet mapped\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Reconstitution of NF-L filament assembly in non-neuronal cells demonstrated that NF-L is intrinsically competent to form 10-nm filaments and can copolymerize with vimentin, resolving whether neuron-specific cofactors were required.\",\n      \"evidence\": \"Transfection of NF-L into L cells; immunofluorescence and solubility fractionation\",\n      \"pmids\": [\"2493000\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of NF-L/vimentin copolymers undefined\", \"Regulation of assembly not addressed\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Functional dissection of the NF-L promoter identified cAMP- and NGF-responsive elements, establishing the transcriptional control architecture driving neuron-specific NF-L expression.\",\n      \"evidence\": \"Promoter-CAT reporter assays, DNase I footprinting, and gel-shift in PC12 cells\",\n      \"pmids\": [\"7745611\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo chromatin context not examined\", \"Upstream signaling cascades linking NGF receptor to these elements not fully mapped\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrating that cAMP-dependent phosphorylation blocks a late stage of NF-L/NF-M coassembly established head-domain phosphorylation as a key negative regulator of neurofilament polymerization.\",\n      \"evidence\": \"In vitro phosphorylation with sedimentation and electron microscopy of reconstituted filaments\",\n      \"pmids\": [\"8670258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the specific kinase(s) acting in vivo not determined\", \"Phosphorylation site(s) not mapped in this study\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of Rho-kinase phosphorylation at Ser-26 and Ser-57 as sufficient for filament disassembly provided the first site-specific mechanism linking a signaling pathway to neurofilament dynamics.\",\n      \"evidence\": \"In vitro kinase assay with MALDI-TOF site identification and EM of disassembled filaments\",\n      \"pmids\": [\"9571164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance of Rho-kinase phosphorylation at these sites not confirmed\", \"Whether dephosphorylation reverses disassembly not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"NFL knockout mice revealed that loss of NF-L is sufficient to cause sensorimotor dysfunction and spatial learning deficits, establishing NF-L as required for normal neuronal function beyond structural support.\",\n      \"evidence\": \"Behavioral battery and cytochrome oxidase histochemistry in Nefl−/− mice\",\n      \"pmids\": [\"15884021\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking NF-L loss to metabolic and cognitive changes unclear\", \"Single laboratory study\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that 14-3-3 proteins bind NEFL mRNA 3′ UTR hexanucleotide motifs and regulate mRNA stability revealed a post-transcriptional layer of NF-L regulation independent of transcription or phosphorylation.\",\n      \"evidence\": \"LC/MS/MS identification of 14-3-3 on NEFL 3′ UTR; mutagenesis of binding motifs with mRNA stability readout\",\n      \"pmids\": [\"17098443\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions triggering 14-3-3 binding changes unknown\", \"Downstream decay machinery not identified\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Phosphomimetic mutations at head-domain sites blocked axonal transport in living neurons, directly linking NF-L phosphorylation state to neurofilament motility and not just assembly.\",\n      \"evidence\": \"Site-directed mutagenesis with live-cell axonal transport imaging in cultured neurons\",\n      \"pmids\": [\"19147253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Motor protein(s) affected by phosphorylation state not identified\", \"Contribution of individual sites not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The finding that a homozygous NEFL nonsense mutation (E210X) abolishes filament network formation without dominant-negative effects, combined with absent neurofilaments and reduced axonal caliber in patient nerve, established a loss-of-function basis for recessive CMT neuropathy.\",\n      \"evidence\": \"SW13 vim(−) cell assembly assay and sural nerve biopsy ultrastructure from an affected patient\",\n      \"pmids\": [\"20039262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other recessive mutations share identical mechanism not tested\", \"Degree of NF-M/NF-H compensation unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"NFL−/− mice showed aberrant cytosolic TDP-43 accumulation and caspase-3-dependent neuronal death after axotomy, revealing NF-L as a determinant of TDP-43 localization and neuronal survival after injury.\",\n      \"evidence\": \"Axotomy in Nefl−/− mice with immunohistochemistry for TDP-43, PGRN, and caspase-3\",\n      \"pmids\": [\"19619516\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between NF-L and TDP-43 not demonstrated\", \"Mechanism connecting NF-L absence to TDP-43 mislocalization unknown\", \"Single laboratory study\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstration that domain-specific NEFL mutations (Q333P vs P8R) are differentially rescued by distinct chaperones (HSPA1 vs HSPB1) established that CMT-linked mutations cause structurally distinct misfolding defects.\",\n      \"evidence\": \"SW13 cell assembly assay, in vitro refolding, chaperone induction, and live motor neuron imaging\",\n      \"pmids\": [\"23618875\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of differential chaperone sensitivity not resolved\", \"In vivo therapeutic potential of chaperone induction not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Quantitative biophysical analysis of HspB1 and HspB5 binding to NFL at defined stoichiometry (~1:2 HspB1:NFL) and kinetic slowing of polymerization established small heat shock proteins as direct modulators of neurofilament assembly dynamics.\",\n      \"evidence\": \"Differential centrifugation, analytical ultracentrifugation, and fluorescence polymerization kinetics with recombinant proteins\",\n      \"pmids\": [\"28000086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo stoichiometry and regulation of sHsp–NFL interaction unknown\", \"Effect on mixed NF-L/NF-M/NF-H filaments not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Patient iPSC-derived motor neurons confirmed that recessive NEFL nonsense mutations cause near-complete mRNA loss via NMD, with pharmacological NMD inhibition partially rescuing NEFL mRNA, definitively establishing the molecular mechanism of recessive NEFL-CMT.\",\n      \"evidence\": \"iPSC motor neurons; qPCR, Western blot, EM, single-cell transcriptomics, NMD inhibitor rescue\",\n      \"pmids\": [\"29888333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NMD inhibition can restore sufficient protein for functional rescue in vivo unknown\", \"Long-term consequences of partial NEFL restoration not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of NF-L assembly and the identity of motor proteins whose interaction with neurofilaments is regulated by head-domain phosphorylation remain unresolved, as does the mechanism by which NF-L loss leads to TDP-43 mislocalization.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of assembled NF-L filament\", \"Motor adaptor linking phosphorylation to transport not identified\", \"Direct NF-L–TDP-43 interaction not tested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 5, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 7, 16]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 15, 16, 17]}\n    ],\n    \"complexes\": [\n      \"neurofilament (NF-L/NF-M/NF-H)\"\n    ],\n    \"partners\": [\n      \"NEFM\",\n      \"VIM\",\n      \"HSPB1\",\n      \"CRYAB\",\n      \"YWHAB\",\n      \"MTMR2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}