{"gene":"STMN2","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1988,"finding":"STMN2 (SCG10) protein is tightly associated with membranes (but is not an integral membrane protein) and accumulates in perinuclear cytoplasm, axons, and growth cones of cultured neurons, as shown by cell fractionation and immunocytochemical localization with an affinity-purified antibody.","method":"Cell fractionation, immunocytochemistry","journal":"Neuron","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular fractionation and immunolocalization, single lab but two orthogonal methods","pmids":["3272176"],"is_preprint":false},{"year":1990,"finding":"The SCG10 gene contains a constitutive enhancer-like element in the promoter-proximal region and an upstream silencer that preferentially suppresses enhancer activity in nonneuronal cells in an orientation-independent manner, establishing a derepression mechanism for neuron-specific expression.","method":"Deletion analysis, transfection reporter assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Strong — promoter deletion mapping with functional reporter assays, replicated across constructs","pmids":["2322462"],"is_preprint":false},{"year":1992,"finding":"A 21 bp neural-restrictive silencer element (NRSE) in the SCG10 gene binds a sequence-specific factor (NRSBF) present in nonneuronal but not neuronal nuclear extracts; a point mutation abolishing in vitro binding also eliminates in vivo silencing activity.","method":"Deletion analysis, electrophoretic mobility shift assay (EMSA), point mutagenesis, transfection reporter assay","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding with mutagenesis confirmed in vivo, multiple orthogonal methods","pmids":["1321646"],"is_preprint":false},{"year":1997,"finding":"SCG10 binds to microtubules, inhibits their assembly, and can induce microtubule disassembly in vitro; overexpression enhances neurite outgrowth in a stably transfected neuronal cell line, identifying it as a regulator of microtubule instability.","method":"In vitro microtubule assembly assay, stable cell transfection, neurite outgrowth quantification","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro activity plus functional cell assay, multiple orthogonal methods","pmids":["9012855"],"is_preprint":false},{"year":1997,"finding":"The N-terminal 34-amino-acid domain of SCG10 is necessary and sufficient for membrane targeting and Golgi localization; two cysteine residues (Cys22 and Cys24) within this domain are sites of palmitoylation, as shown by biosynthetic [3H]palmitic acid labeling.","method":"Deletion/fusion constructs in PC12 and COS-7 cells, biosynthetic radiolabeling with [3H]palmitic acid, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with biochemical palmitoylation labeling and localization, multiple orthogonal methods","pmids":["9030585"],"is_preprint":false},{"year":1997,"finding":"SCG10 is phosphorylated in vitro by MAP kinase, cAMP-dependent protein kinase, cGMP-dependent protein kinase, p34cdc2 kinase, DNA-dependent protein kinase, Ca2+/calmodulin kinase II, casein kinase II, and Src tyrosine kinase, but not by casein kinase I or protein kinase C.","method":"In vitro phosphorylation assay with recombinant protein","journal":"Protein expression and purification","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assays with recombinant protein, single lab","pmids":["9126608"],"is_preprint":false},{"year":1998,"finding":"SCG10 is phosphorylated in vivo at Ser50 and Ser97 by protein kinase A, and at Ser62 and Ser73 by MAP kinase; Ser73 is also a CDK substrate. Non-phosphorylatable mutants show increased microtubule-destabilizing activity while phosphomimetic (Ser→Asp) mutants show decreased activity, demonstrating that phosphorylation negatively regulates SCG10's microtubule-destabilizing function.","method":"2D gel electrophoresis, mass spectrometry, in vitro kinase assay, site-directed mutagenesis, COS-7 cell transfection microtubule disruption assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry site identification combined with mutagenesis and functional assay, multiple orthogonal methods","pmids":["9525956"],"is_preprint":false},{"year":2000,"finding":"SCG10 localizes by immunoelectron microscopy to the trans-face Golgi complex and growth cone vesicles in developing cortex; palmitoylation of Cys22/Cys24 in the N-terminal domain is required for Golgi sorting and growth cone targeting, as shown by deletion/mutation of the N-terminal domain in transfected PC12 cells and primary neurons.","method":"Immunoelectron microscopy, subcellular fractionation, transfection of mutant/fusion constructs, immunofluorescence","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — EM-level localization, fractionation, and mutagenesis in multiple cell types","pmids":["10947801"],"is_preprint":false},{"year":2001,"finding":"JNK3/SAPKβ directly binds and phosphorylates SCG10 at Ser62 and Ser73, reducing its microtubule-destabilizing activity; endogenous SCG10 shows increased phosphorylation in sympathetic neurons deprived of NGF, a condition that activates JNK.","method":"In vitro binding assay, in vitro kinase assay, mass spectrometry, phosphorylation in NGF-deprived sympathetic neurons","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution plus cell-based confirmation, single lab","pmids":["11718727"],"is_preprint":false},{"year":2002,"finding":"RGSZ1 directly interacts with SCG10 (confirmed by yeast two-hybrid and direct binding assays) and, upon binding, blocks SCG10's ability to induce microtubule disassembly in vitro. NGF treatment causes both proteins to co-localize at the Golgi in PC12 cells.","method":"Yeast two-hybrid, direct binding assay, in vitro microtubule polymerization/turbidimetry assay, GFP-tagging and immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including reconstituted microtubule assay, direct binding, and cell co-localization","pmids":["11882662"],"is_preprint":false},{"year":2002,"finding":"RGS6 interacts with SCG10 via its GGL domain binding to SCG10's stathmin domain (yeast two-hybrid and GST pull-down); RGS6 potentiates SCG10-induced microtubule disruption and synergistically enhances NGF-induced PC12 differentiation with SCG10.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence co-localization, PC12 differentiation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal pulldowns, yeast two-hybrid, and functional cell assay across multiple cell lines","pmids":["12140291"],"is_preprint":false},{"year":2004,"finding":"EphB stimulation in retinal growth cones causes reduced levels of SCG10, and antibody blockade of SCG10 function mimics EphB-induced changes in microtubule distribution and growth cone pause responses, placing SCG10 downstream of EphB guidance signaling.","method":"Pharmacological growth cone stimulation, immunofluorescence, antibody blockade functional assay","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional antibody blockade with quantified phenotype, single lab","pmids":["14985440"],"is_preprint":false},{"year":2006,"finding":"JNK1 phosphorylates SCG10 in vivo at Ser62 and Ser73 in developing forebrain (Ser73 phosphorylation is reduced in JNK1-/- cortex); JNK phosphorylation of SCG10 determines axodendritic length, and expression of SCG10-S62A/S73A (non-phosphorylatable) inhibits fluorescent tubulin recovery after photobleaching, linking JNK1-SCG10 phosphorylation to microtubule dynamics.","method":"Affinity purification of JNK-interacting proteins from brain, in vivo phosphorylation in JNK1-/- mice, FRAP, cerebrocortical neuron cultures with mutant constructs","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo genetic validation (knockout mice), FRAP, multiple mutants, multi-method approach","pmids":["16618812"],"is_preprint":false},{"year":2006,"finding":"SCG10 siRNA knockdown suppresses neurite outgrowth and alters growth cone microtubule morphology toward a more stable state in rat hippocampal neurons; protein transduction of SCG10 stimulates outgrowth and produces more dynamic microtubule morphology. Excess SCG10 causes neurite retraction.","method":"siRNA knockdown, immunodepletion, protein transduction, immunofluorescence of growth cone microtubules","journal":"Journal of neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with morphological readout, single lab","pmids":["16838365"],"is_preprint":false},{"year":2007,"finding":"In contrast to stathmin, SCG10 stabilizes microtubule plus ends (increasing growth rate) while destabilizing minus ends (increasing shortening rate and catastrophe frequency) at steady state in vitro; SCG10 binds along the length of purified microtubules.","method":"In vitro dynamic instability assay (video microscopy of individual microtubules), microtubule co-sedimentation/pull-down","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous reconstituted in vitro assay with single microtubule resolution, multiple conditions","pmids":["17311410"],"is_preprint":false},{"year":2008,"finding":"SCG10 interacts with chromogranin A (CHGA) and co-localizes with it at the Golgi; siRNA knockdown of SCG10 virtually abolishes regulated secretion of a CHGA reporter, and a palmitoylation-deficient dominant negative SCG10 (C22A/C24A) blocks CHGA-EAP secretion. SCG10 knockdown decreases buoyant density of chromaffin granules.","method":"Phage display, co-immunoprecipitation, siRNA knockdown, dominant-negative mutant, secretion assay, density gradient fractionation","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, siRNA, and dominant negative functional assay, single lab","pmids":["18549247"],"is_preprint":false},{"year":2010,"finding":"KBP (Kinesin Binding Protein) physically interacts with SCG10 (yeast two-hybrid, validated biochemically); in zebrafish, epistasis experiments demonstrate a genetic interaction between KBP and SCG10 in vivo, linking this interaction to the neuronal differentiation and microtubule-related defects of Goldberg-Shprintzen syndrome.","method":"Yeast two-hybrid, biochemical validation, zebrafish epistasis experiments","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid with in vivo epistasis in zebrafish, single lab","pmids":["20621975"],"is_preprint":false},{"year":2011,"finding":"JNK1 phosphorylation of SCG10 governs multipolar-stage exit and radial neuronal migration rate during cortical development; expressing a phosphomimetic SCG10 mutant rescued normal migration in JNK1-/- mouse embryos, placing JNK1-SCG10 phosphorylation as a key negative regulator of cortical neuron migration.","method":"Jnk1-/- mouse embryos, in utero electroporation of SCG10 phospho-mutants, live imaging of cortical migration","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue in JNK1 knockout with phosphomimetic mutant, replicated across multiple experiments","pmids":["21297631"],"is_preprint":false},{"year":2011,"finding":"Calmyrin1 (CaMy1) directly and Ca2+-dependently binds SCG10 via its C-terminal domain (residues 99–192) interacting with SCG10's N-terminal domain (residues 1–35); CaMy1 interferes with SCG10's microtubule-polymerization inhibitory activity and inhibits SCG10-mediated neurite outgrowth in NGF-stimulated PC12 cells.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, proximity ligation assay, in vitro microtubule polymerization assay, PC12 neurite outgrowth assay","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal binding assays, reconstituted in vitro activity, and functional cell assay","pmids":["21215777"],"is_preprint":false},{"year":2012,"finding":"SCG10 is an axonal JNK substrate that is rapidly lost from axons distal to injury via JNK-dependent phosphorylation targeting it for degradation; in healthy axons SCG10 undergoes JNK-dependent degradation and is replenished by fast axonal transport. Knockdown of SCG10 accelerates axon fragmentation, while maintaining SCG10 after injury promotes mitochondrial movement and delays degeneration.","method":"Mouse dorsal root ganglion axotomy model, pharmacological JNK inhibition, shRNA knockdown, lentiviral SCG10 overexpression, live mitochondrial imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic and pharmacological loss-of-function with quantified phenotypes, multiple orthogonal approaches","pmids":["23188802"],"is_preprint":false},{"year":2013,"finding":"CB1 cannabinoid receptor activation recruits c-Jun N-terminal kinases to phosphorylate SCG10, promoting its rapid degradation in motile axons and microtubule stabilization; this leads to ectopic filopodia formation and altered axon morphology.","method":"THC exposure in fetal brain, proteomic analysis, pharmacological CB1 receptor manipulation, JNK inhibition, immunofluorescence","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification and pharmacological dissection, single lab","pmids":["24469251"],"is_preprint":false},{"year":2013,"finding":"SCG10 directly interacts with the KFFEQ motif of the APP intracellular domain (co-IP, co-localization); SCG10 knockdown reduces α-cleavage products (sAPPα, CTFα) and increases Aβ1-40/1-42, while SCG10 elevation promotes APP accumulation in post-Golgi vesicles and on the cell surface, reducing amyloid plaques in APPswe/PS1dE9 mice. This effect requires palmitoylation-mediated membrane anchoring of SCG10.","method":"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, overexpression, ELISA (Aβ measurement), in vivo mouse model","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, loss/gain-of-function, and in vivo mouse model, single lab","pmids":["23863461"],"is_preprint":false},{"year":2013,"finding":"PAK4 phosphorylates SCG10 at Ser50; phosphorylated SCG10 regulates microtubule dynamics to promote gastric cancer cell migration and invasion in vitro and metastasis in xenograft models.","method":"In vitro kinase assay, siRNA knockdown, PAK4 inhibitor, invasion/migration assays, xenograft mouse model","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase assay, genetic and pharmacological knockdown, in vivo xenograft, single lab","pmids":["23893240"],"is_preprint":false},{"year":2015,"finding":"Spy1 (a Speedy/RINGO family protein) binds SCG10 and mediates its phosphorylation and proteasomal degradation in a partly JNK-dependent manner after sciatic nerve injury; inhibition of Spy1 attenuates SCG10 phosphorylation and delays injury-induced axonal degeneration.","method":"Co-immunoprecipitation, sciatic nerve injury model, Spy1 inhibition, Western blot for SCG10 levels","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus in vivo nerve injury model with pharmacological inhibition, single lab","pmids":["25869138"],"is_preprint":false},{"year":2019,"finding":"TDP-43 depletion in human motor neurons causes loss of STMN2 expression due to altered splicing (inclusion of a cryptic exon/premature polyadenylation). STMN2 is necessary for normal axonal outgrowth and regeneration; post-translational stabilization of STMN2 rescues neurite outgrowth and axon regeneration deficits caused by TDP-43 depletion.","method":"TDP-43 knockdown in iPSC-derived human motor neurons, RNA-seq, RT-PCR, axon regeneration assay, post-translational stabilization rescue","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — human motor neuron model, RNA-seq, loss-of-function with rescue, multiple orthogonal methods","pmids":["30643292"],"is_preprint":false},{"year":2021,"finding":"STMN2 modulates microtubule disassembly to disrupt the MT-Smad2/3 complex, facilitating Smad2/3 release, phosphorylation, and nuclear translocation even independent of TGFβ stimulation, thereby enhancing TGFβ signaling and promoting epithelial-mesenchymal transition in hepatocellular carcinoma.","method":"STMN2 overexpression/knockdown, immunofluorescence, co-immunoprecipitation, in vitro invasion assay, in vivo xenograft","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP for MT-Smad interaction, loss/gain-of-function with mechanistic readout, single lab","pmids":["33705863"],"is_preprint":false},{"year":2022,"finding":"Homozygous loss-of-function Stmn2 mice exhibit neuromuscular junction denervation and fragmentation, muscle atrophy, impaired motor behavior, and neuronal microtubule dynamics imbalance in spinal cord; these phenotypes are rescued by BAC transgenesis of human STMN2, demonstrating that STMN2 is required for motor system maintenance.","method":"Gene-edited Stmn2 knockout mice, BAC transgenic rescue, NMJ histology, behavioral motor testing, immunofluorescence of microtubules","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular/behavioral phenotype and transgenic rescue, multiple orthogonal readouts","pmids":["35294901"],"is_preprint":false},{"year":2023,"finding":"TDP-43 binding to a GU-rich region in STMN2 pre-mRNA sterically blocks recognition of a cryptic 3′ splice site. Targeting dCasRx or antisense oligonucleotides (ASOs) to this region suppressed cryptic splicing, restoring axonal regeneration and stathmin-2-dependent lysosome trafficking in TDP-43-deficient human motor neurons. In mice gene-edited to carry human STMN2 cryptic sequences, intrathecal ASO injection corrected pre-mRNA misprocessing and restored stathmin-2 levels.","method":"Biochemical TDP-43 binding assays, dCasRx targeting, ASO treatment, iPSC-derived motor neuron axonal regeneration assay, lysosome trafficking assay, humanized mouse model with CSF ASO injection","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — mechanistic steric-blocking model validated by dCasRx and ASO rescue in cells and in vivo, multiple orthogonal methods","pmids":["36927019"],"is_preprint":false},{"year":2024,"finding":"Stress-induced nuclear TDP-43 condensation (requiring TDP-43 oligomerization and ATP, inhibited by RNA) transiently inactivates TDP-43, causing loss of interaction with protein binding partners and splicing loss-of-function; STMN2 splicing changes are especially prominent and persistent, leading to rapid STMN2 protein depletion early during stress.","method":"Confocal nanoscanning assay, co-immunoprecipitation, RNA splicing analysis, Western blot for STMN2 protein, ALS-linked TDP-43 mutants","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic dissection of condensation requirements with functional splicing readout, single lab","pmids":["38941189"],"is_preprint":false},{"year":2025,"finding":"STMN2 is primarily degraded by the ubiquitin-proteasome system; its membrane-targeting N-terminal domain promotes fast turnover while its tubulin-binding stathmin-like domain promotes stabilization. Tubulin binds preferentially to soluble (non-membrane-bound) STMN2, reducing its targeting to trans-Golgi network membranes, suggesting STMN2 interconverts between a soluble tubulin-bound form and a membrane-bound tubulin-free form.","method":"Ubiquitin-proteasome inhibitor treatment, proximity labeling, pull-down assays, imaging in U2OS cells and iPSC-derived neurons, N-terminal domain deletion mutants","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution (pull-down), proximity labeling, mutagenesis, and multiple cell systems with orthogonal readouts","pmids":["41171096"],"is_preprint":false},{"year":2025,"finding":"Depletion of SRSF7 (serine/arginine-rich splicing factor 7) in human iPSC-derived neurons decreases STMN2 abundance (but not TDP-43) and impairs axonal regeneration; this phenotype is rescued by exogenous STMN2, placing SRSF7 upstream of STMN2 in a pathway linking C9ORF72 poly-PR toxicity to axonal repair defects.","method":"SRSF7 siRNA knockdown in iPSC-derived neurons, STMN2 rescue experiment, axonal regeneration assay, global phospho-proteomics","journal":"Acta neuropathologica communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with rescue and defined phenotype, single lab","pmids":["40140908"],"is_preprint":false},{"year":2024,"finding":"STMN2 overexpression restores axonal growth defects in SMA patient iPSC-derived motor neurons; intracerebroventricular AAV9-Stmn2 delivery in SMA mice improves survival, motor function, and neuromuscular junction pathology.","method":"iPSC-derived motor neuron overexpression assay, AAV9 in vivo delivery in SMA mice, behavioral and histological assessment","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain-of-function with defined phenotypic readouts, single lab","pmids":["39725771"],"is_preprint":false},{"year":2025,"finding":"In zebrafish double stmn2a/stmn2b knockout larvae, loss of STMN2 impairs motor function, increases orphaned NMJs, reduces miniature endplate current amplitude, and impairs ventral root axon regrowth after transection, demonstrating STMN2 is required for NMJ assembly and axon regeneration but not motor axon development.","method":"CRISPR/Cas9 double knockout zebrafish, behavioral motor assay, NMJ immunohistochemistry, electrophysiology (mEPCs), axon transection/regeneration assay","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with multiple cellular and electrophysiological phenotypes, preprint not yet peer reviewed","pmids":["bio_10.1101_2025.10.24.684380"],"is_preprint":true},{"year":2006,"finding":"STMN2 is a direct transcriptional target of β-catenin/TCF signaling; chromatin immunoprecipitation and promoter mapping identified a critical TCF binding site at -1713 of the STMN2 promoter, and siRNA knockdown of STMN2 abolished anchorage-independent growth in β-catenin/TCF-activated hepatoma cells.","method":"Promoter deletion, ChIP assay, transient transfection, siRNA knockdown, soft agar colony assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ChIP and promoter mapping with functional siRNA readout, single lab","pmids":["16712787"],"is_preprint":false},{"year":2004,"finding":"Protocadherin-γ-b1 (and other Pcdhγ-b subfamily isoforms) interact with SCG10 as a cytoplasmic binding partner, and SCG10 and Pcdhγ-b1 are found together in neuronal growth cones.","method":"Yeast two-hybrid, co-localization in growth cones","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid with co-localization, no reciprocal co-IP or functional validation, single lab","pmids":["15581637"],"is_preprint":false},{"year":2008,"finding":"BRI3 binds SCG10 (GST pull-down, co-IP) and blocks SCG10's ability to induce microtubule disassembly in vitro; co-expression of BRI3 attenuates SCG10-mediated neurite outgrowth in NGF-stimulated PC12 cells.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, turbidimetric microtubule assay, PC12 neurite outgrowth assay","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro microtubule assay plus co-IP and functional cell assay, single lab","pmids":["18452648"],"is_preprint":false}],"current_model":"STMN2 (SCG10) is a membrane-palmitoylated (at Cys22/Cys24), neuron-enriched microtubule-destabilizing protein that traffics from the trans-Golgi network to growth cones, where it promotes axonal outgrowth and regeneration by destabilizing microtubule minus ends while stabilizing plus ends; its activity is negatively regulated by phosphorylation at Ser50/Ser97 (PKA), Ser62/Ser73 (MAPK/JNK), with JNK1-mediated phosphorylation governing neuronal migration and axonal maintenance; nuclear TDP-43 sterically blocks a cryptic splice site in STMN2 pre-mRNA, so TDP-43 nuclear loss (as in ALS/FTD) causes cryptic splicing and STMN2 depletion, impairing axon regeneration and NMJ integrity; soluble STMN2 is stabilized by tubulin binding and degraded by the ubiquitin-proteasome system when released from both tubulin and membranes."},"narrative":{"mechanistic_narrative":"STMN2 (SCG10) is a neuron-enriched, microtubule-destabilizing protein that traffics from the trans-Golgi network to growth cones, where it controls the microtubule dynamics underlying axonal outgrowth, guidance, and regeneration [PMID:3272176, PMID:9012855, PMID:10947801]. It functions asymmetrically on microtubule ends, stabilizing plus ends while destabilizing minus ends, and binds along the microtubule lattice [PMID:17311410]; loss- and gain-of-function in neurons confirm it tunes growth-cone microtubule morphology toward a dynamic state to permit neurite extension [PMID:16838365]. Membrane association is conferred by an N-terminal domain whose palmitoylation at Cys22/Cys24 is required for Golgi sorting and growth-cone targeting [PMID:9030585, PMID:10947801], while the tubulin-binding stathmin-like domain stabilizes a soluble pool; STMN2 interconverts between a soluble tubulin-bound form and a membrane-bound tubulin-free form and is otherwise turned over by the ubiquitin-proteasome system [PMID:41171096]. Its destabilizing activity is held in check by phosphorylation at Ser50/Ser97 (PKA) and Ser62/Ser73 (MAPK/JNK), with phosphomimetic mutants losing activity [PMID:9525956]; JNK1-mediated phosphorylation specifically governs cortical neuron migration and axodendritic length in vivo [PMID:16618812, PMID:21297631], and JNK-dependent phosphorylation drives STMN2 degradation in axons, coupling its loss to injury-induced axon fragmentation [PMID:23188802]. STMN2 is required for motor-system maintenance: knockout mice show neuromuscular junction denervation, muscle atrophy, and motor deficits rescued by human STMN2 [PMID:35294901]. In ALS/FTD, nuclear TDP-43 binds a GU-rich region of STMN2 pre-mRNA to sterically block a cryptic 3' splice site; TDP-43 nuclear loss or stress-induced condensation triggers cryptic splicing and STMN2 depletion, impairing axon regeneration—a defect reversible by ASO or dCasRx targeting of the cryptic site [PMID:30643292, PMID:36927019, PMID:38941189].","teleology":[{"year":1988,"claim":"Established where STMN2 protein resides in neurons, the first clue that it acts at the growth cone rather than as a soluble cytoplasmic factor.","evidence":"Cell fractionation and immunocytochemistry in cultured neurons","pmids":["3272176"],"confidence":"Medium","gaps":["Molecular activity unknown at this stage","Mode of membrane association undefined"]},{"year":1992,"claim":"Explained how STMN2 achieves neuron-specific expression, identifying an NRSE/silencer derepression mechanism active in nonneuronal cells.","evidence":"Promoter deletion mapping, EMSA, point mutagenesis, and reporter assays","pmids":["2322462","1321646"],"confidence":"High","gaps":["Identity of the silencing factor not molecularly defined here","Does not address protein function"]},{"year":1997,"claim":"Defined STMN2's core molecular activity as a microtubule destabilizer and linked it functionally to neurite outgrowth, while mapping the N-terminal palmitoylated domain that targets it to membranes/Golgi.","evidence":"In vitro microtubule assembly assays, neurite outgrowth in transfected cells, [3H]palmitate labeling, and fusion constructs","pmids":["9012855","9030585"],"confidence":"High","gaps":["End-specific effects on microtubules not yet resolved","In vivo neuronal requirement untested"]},{"year":1998,"claim":"Demonstrated that phosphorylation negatively regulates STMN2's destabilizing activity, mapping PKA (Ser50/Ser97) and MAPK/CDK (Ser62/Ser73) sites and validating with phospho-mutants.","evidence":"2D gels, mass spectrometry, in vitro kinase assays, mutagenesis, and cell microtubule disruption assays","pmids":["9525956"],"confidence":"High","gaps":["Physiological kinase governing each site in vivo not yet assigned","Connection to specific neuronal processes pending"]},{"year":2002,"claim":"Identified direct binding partners (RGSZ1, RGS6) that modulate STMN2's microtubule activity, beginning to place it within signaling networks at the Golgi and during NGF-induced differentiation.","evidence":"Yeast two-hybrid, GST pull-down, co-IP, in vitro microtubule assays, and PC12 differentiation","pmids":["11882662","12140291"],"confidence":"High","gaps":["Endogenous relevance of these interactions in neurons unclear","Opposite effects (inhibition vs potentiation) not mechanistically reconciled"]},{"year":2007,"claim":"Resolved STMN2's distinctive biochemistry, showing it stabilizes plus ends while destabilizing minus ends and binds along the lattice, distinguishing it from stathmin.","evidence":"In vitro dynamic instability assays at single-microtubule resolution and co-sedimentation","pmids":["17311410"],"confidence":"High","gaps":["Structural basis of end-specific activity unresolved","Relevance to growth-cone microtubule arrays not directly tested here"]},{"year":2011,"claim":"Established JNK1-STMN2 phosphorylation as an in vivo regulator of cortical neuron migration and axodendritic length, moving the phospho-regulation from biochemistry to developmental physiology.","evidence":"Jnk1-/- mice, in utero electroporation of phospho-mutants, FRAP, and live cortical imaging","pmids":["16618812","21297631"],"confidence":"High","gaps":["Other kinases' developmental roles not dissected","Downstream microtubule events in migrating neurons inferred"]},{"year":2013,"claim":"Showed that JNK-dependent phosphorylation targets axonal STMN2 for degradation, coupling its loss to axon fragmentation and identifying it as a regulator of injury-induced degeneration.","evidence":"DRG axotomy, JNK inhibition, knockdown/overexpression, and live mitochondrial imaging","pmids":["23188802"],"confidence":"High","gaps":["E3 ligase mediating degradation not identified","Link between STMN2 maintenance and mitochondrial transport mechanistically incomplete"]},{"year":2019,"claim":"Connected STMN2 to ALS/FTD by showing TDP-43 depletion causes cryptic splicing and STMN2 loss, and that STMN2 is required for axon regeneration with stabilization rescuing the deficit.","evidence":"TDP-43 knockdown in iPSC-derived motor neurons, RNA-seq, RT-PCR, and regeneration rescue","pmids":["30643292"],"confidence":"High","gaps":["Steric mechanism of TDP-43 splice control not yet shown","Therapeutic targeting not yet demonstrated"]},{"year":2022,"claim":"Provided in vivo genetic proof that STMN2 is required for motor-system maintenance, with NMJ denervation and motor deficits rescued by human STMN2.","evidence":"Stmn2 knockout mice, BAC transgenic rescue, NMJ histology, behavioral testing","pmids":["35294901"],"confidence":"High","gaps":["Cell-autonomous vs non-autonomous requirement not fully resolved","Relationship to human disease dosage unaddressed"]},{"year":2023,"claim":"Defined the molecular mechanism of TDP-43 splice regulation as steric blockade of a cryptic 3' splice site and demonstrated ASO/dCasRx correction in cells and humanized mice, establishing a therapeutic strategy.","evidence":"TDP-43 binding assays, dCasRx and ASO targeting, iPSC motor neuron and humanized mouse models with CSF ASO injection","pmids":["36927019"],"confidence":"High","gaps":["Long-term efficacy and safety not addressed","Whether STMN2 restoration alone suffices in patients unknown"]},{"year":2025,"claim":"Resolved STMN2's turnover logic, showing UPS degradation, an N-terminal domain promoting fast turnover, and a tubulin-bound soluble form versus a membrane-bound form, defining how its pools are partitioned.","evidence":"Proteasome inhibition, proximity labeling, pull-downs, and domain-deletion imaging in U2OS and iPSC neurons","pmids":["41171096"],"confidence":"High","gaps":["Specific E3 ligase still unidentified","Regulation of soluble/membrane interconversion in living axons unresolved"]},{"year":null,"claim":"How STMN2's end-specific microtubule activity, membrane/soluble interconversion, and phospho-degradation circuitry are integrated to enable axon regeneration in disease contexts remains to be fully assembled.","evidence":"","pmids":[],"confidence":"High","gaps":["No identified E3 ligase for STMN2","No structural model explaining plus-end stabilization vs minus-end destabilization","Causal contribution of STMN2 loss versus other TDP-43 targets to ALS pathology unquantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[3,14,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator 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Molecular brain research","url":"https://pubmed.ncbi.nlm.nih.gov/14741408","citation_count":7,"is_preprint":false},{"pmid":"21215777","id":"PMC_21215777","title":"Calmyrin1 binds to SCG10 protein (stathmin2) to modulate neurite outgrowth.","date":"2011","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/21215777","citation_count":6,"is_preprint":false},{"pmid":"34389950","id":"PMC_34389950","title":"Investigation into the role of Stmn2 in vascular smooth muscle phenotype transformation during vascular injury via RNA sequencing and experimental validation.","date":"2021","source":"Environmental science and pollution research international","url":"https://pubmed.ncbi.nlm.nih.gov/34389950","citation_count":6,"is_preprint":false},{"pmid":"11042086","id":"PMC_11042086","title":"Preliminary crystallographic study of a complex formed between the alpha/beta-tubulin heterodimer and the neuronal growth-associated protein SCG10.","date":"2000","source":"Journal of structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/11042086","citation_count":6,"is_preprint":false},{"pmid":"40140908","id":"PMC_40140908","title":"C9ORF72 poly-PR disrupts expression of ALS/FTD-implicated STMN2 through SRSF7.","date":"2025","source":"Acta neuropathologica communications","url":"https://pubmed.ncbi.nlm.nih.gov/40140908","citation_count":5,"is_preprint":false},{"pmid":"21187955","id":"PMC_21187955","title":"Mutations in SCG10 are not involved in Hirschsprung disease.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21187955","citation_count":5,"is_preprint":false},{"pmid":"11959419","id":"PMC_11959419","title":"Expression of super cervical ganglion-10 (SCG-10) mRNA in the monkey cerebral cortex during postnatal development.","date":"2002","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/11959419","citation_count":5,"is_preprint":false},{"pmid":"35923349","id":"PMC_35923349","title":"Questioning the Association of the STMN2 Dinucleotide Repeat With Amyotrophic Lateral Sclerosis.","date":"2022","source":"Neurology. 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biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21705344","citation_count":3,"is_preprint":false},{"pmid":"40775435","id":"PMC_40775435","title":"Machine learning-based proteomics profiling of ALS identifies downregulation of RPS29 that maintains protein homeostasis and STMN2 level.","date":"2025","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/40775435","citation_count":2,"is_preprint":false},{"pmid":"41171096","id":"PMC_41171096","title":"Tubulin regulates stability and localization of STMN2 by binding preferentially to its soluble form.","date":"2025","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/41171096","citation_count":1,"is_preprint":false},{"pmid":"38423163","id":"PMC_38423163","title":"The Interaction between ADK and SCG10 Regulate the Repair of Nerve Damage.","date":"2024","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/38423163","citation_count":1,"is_preprint":false},{"pmid":"40060442","id":"PMC_40060442","title":"Tubulin Regulates the Stability and Localization of STMN2 by Binding Preferentially to Its Soluble Form.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40060442","citation_count":1,"is_preprint":false},{"pmid":"34528820","id":"PMC_34528820","title":"Genome Sequence of Linnemannia hyalina Strain SCG-10, a Cold-Adapted and Nitrate-Reducing Fungus Isolated from Cornfield Soil in Minnesota, USA.","date":"2021","source":"Microbiology resource announcements","url":"https://pubmed.ncbi.nlm.nih.gov/34528820","citation_count":1,"is_preprint":false},{"pmid":"41573891","id":"PMC_41573891","title":"Dual-targeting snRNA gene therapy rescues STMN2 and UNC13A splicing in TDP-43 proteinopathies.","date":"2025","source":"bioRxiv : the preprint server for 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reports","url":"https://pubmed.ncbi.nlm.nih.gov/41180957","citation_count":0,"is_preprint":false},{"pmid":"35876065","id":"PMC_35876065","title":"Analysis of STMN2 CA repeats in italian ALS patients shows no association.","date":"2022","source":"Amyotrophic lateral sclerosis & frontotemporal degeneration","url":"https://pubmed.ncbi.nlm.nih.gov/35876065","citation_count":0,"is_preprint":false},{"pmid":"41904954","id":"PMC_41904954","title":"Regulation of neuronal invasion of small cell lung cancer by STMN2/β-alanine-controlled metabolic reprogramming.","date":"2026","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/41904954","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.10.24.684380","title":"Impaired larval motor function in a zebrafish Stathmin-2 (STMN2) knockout 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with membranes (but is not an integral membrane protein) and accumulates in perinuclear cytoplasm, axons, and growth cones of cultured neurons, as shown by cell fractionation and immunocytochemical localization with an affinity-purified antibody.\",\n      \"method\": \"Cell fractionation, immunocytochemistry\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular fractionation and immunolocalization, single lab but two orthogonal methods\",\n      \"pmids\": [\"3272176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"The SCG10 gene contains a constitutive enhancer-like element in the promoter-proximal region and an upstream silencer that preferentially suppresses enhancer activity in nonneuronal cells in an orientation-independent manner, establishing a derepression mechanism for neuron-specific expression.\",\n      \"method\": \"Deletion analysis, transfection reporter assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — promoter deletion mapping with functional reporter assays, replicated across constructs\",\n      \"pmids\": [\"2322462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"A 21 bp neural-restrictive silencer element (NRSE) in the SCG10 gene binds a sequence-specific factor (NRSBF) present in nonneuronal but not neuronal nuclear extracts; a point mutation abolishing in vitro binding also eliminates in vivo silencing activity.\",\n      \"method\": \"Deletion analysis, electrophoretic mobility shift assay (EMSA), point mutagenesis, transfection reporter assay\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding with mutagenesis confirmed in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"1321646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"SCG10 binds to microtubules, inhibits their assembly, and can induce microtubule disassembly in vitro; overexpression enhances neurite outgrowth in a stably transfected neuronal cell line, identifying it as a regulator of microtubule instability.\",\n      \"method\": \"In vitro microtubule assembly assay, stable cell transfection, neurite outgrowth quantification\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro activity plus functional cell assay, multiple orthogonal methods\",\n      \"pmids\": [\"9012855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The N-terminal 34-amino-acid domain of SCG10 is necessary and sufficient for membrane targeting and Golgi localization; two cysteine residues (Cys22 and Cys24) within this domain are sites of palmitoylation, as shown by biosynthetic [3H]palmitic acid labeling.\",\n      \"method\": \"Deletion/fusion constructs in PC12 and COS-7 cells, biosynthetic radiolabeling with [3H]palmitic acid, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with biochemical palmitoylation labeling and localization, multiple orthogonal methods\",\n      \"pmids\": [\"9030585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"SCG10 is phosphorylated in vitro by MAP kinase, cAMP-dependent protein kinase, cGMP-dependent protein kinase, p34cdc2 kinase, DNA-dependent protein kinase, Ca2+/calmodulin kinase II, casein kinase II, and Src tyrosine kinase, but not by casein kinase I or protein kinase C.\",\n      \"method\": \"In vitro phosphorylation assay with recombinant protein\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assays with recombinant protein, single lab\",\n      \"pmids\": [\"9126608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SCG10 is phosphorylated in vivo at Ser50 and Ser97 by protein kinase A, and at Ser62 and Ser73 by MAP kinase; Ser73 is also a CDK substrate. Non-phosphorylatable mutants show increased microtubule-destabilizing activity while phosphomimetic (Ser→Asp) mutants show decreased activity, demonstrating that phosphorylation negatively regulates SCG10's microtubule-destabilizing function.\",\n      \"method\": \"2D gel electrophoresis, mass spectrometry, in vitro kinase assay, site-directed mutagenesis, COS-7 cell transfection microtubule disruption assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry site identification combined with mutagenesis and functional assay, multiple orthogonal methods\",\n      \"pmids\": [\"9525956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SCG10 localizes by immunoelectron microscopy to the trans-face Golgi complex and growth cone vesicles in developing cortex; palmitoylation of Cys22/Cys24 in the N-terminal domain is required for Golgi sorting and growth cone targeting, as shown by deletion/mutation of the N-terminal domain in transfected PC12 cells and primary neurons.\",\n      \"method\": \"Immunoelectron microscopy, subcellular fractionation, transfection of mutant/fusion constructs, immunofluorescence\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — EM-level localization, fractionation, and mutagenesis in multiple cell types\",\n      \"pmids\": [\"10947801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"JNK3/SAPKβ directly binds and phosphorylates SCG10 at Ser62 and Ser73, reducing its microtubule-destabilizing activity; endogenous SCG10 shows increased phosphorylation in sympathetic neurons deprived of NGF, a condition that activates JNK.\",\n      \"method\": \"In vitro binding assay, in vitro kinase assay, mass spectrometry, phosphorylation in NGF-deprived sympathetic neurons\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution plus cell-based confirmation, single lab\",\n      \"pmids\": [\"11718727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RGSZ1 directly interacts with SCG10 (confirmed by yeast two-hybrid and direct binding assays) and, upon binding, blocks SCG10's ability to induce microtubule disassembly in vitro. NGF treatment causes both proteins to co-localize at the Golgi in PC12 cells.\",\n      \"method\": \"Yeast two-hybrid, direct binding assay, in vitro microtubule polymerization/turbidimetry assay, GFP-tagging and immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including reconstituted microtubule assay, direct binding, and cell co-localization\",\n      \"pmids\": [\"11882662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RGS6 interacts with SCG10 via its GGL domain binding to SCG10's stathmin domain (yeast two-hybrid and GST pull-down); RGS6 potentiates SCG10-induced microtubule disruption and synergistically enhances NGF-induced PC12 differentiation with SCG10.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, immunofluorescence co-localization, PC12 differentiation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal pulldowns, yeast two-hybrid, and functional cell assay across multiple cell lines\",\n      \"pmids\": [\"12140291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"EphB stimulation in retinal growth cones causes reduced levels of SCG10, and antibody blockade of SCG10 function mimics EphB-induced changes in microtubule distribution and growth cone pause responses, placing SCG10 downstream of EphB guidance signaling.\",\n      \"method\": \"Pharmacological growth cone stimulation, immunofluorescence, antibody blockade functional assay\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional antibody blockade with quantified phenotype, single lab\",\n      \"pmids\": [\"14985440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"JNK1 phosphorylates SCG10 in vivo at Ser62 and Ser73 in developing forebrain (Ser73 phosphorylation is reduced in JNK1-/- cortex); JNK phosphorylation of SCG10 determines axodendritic length, and expression of SCG10-S62A/S73A (non-phosphorylatable) inhibits fluorescent tubulin recovery after photobleaching, linking JNK1-SCG10 phosphorylation to microtubule dynamics.\",\n      \"method\": \"Affinity purification of JNK-interacting proteins from brain, in vivo phosphorylation in JNK1-/- mice, FRAP, cerebrocortical neuron cultures with mutant constructs\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo genetic validation (knockout mice), FRAP, multiple mutants, multi-method approach\",\n      \"pmids\": [\"16618812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SCG10 siRNA knockdown suppresses neurite outgrowth and alters growth cone microtubule morphology toward a more stable state in rat hippocampal neurons; protein transduction of SCG10 stimulates outgrowth and produces more dynamic microtubule morphology. Excess SCG10 causes neurite retraction.\",\n      \"method\": \"siRNA knockdown, immunodepletion, protein transduction, immunofluorescence of growth cone microtubules\",\n      \"journal\": \"Journal of neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with morphological readout, single lab\",\n      \"pmids\": [\"16838365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In contrast to stathmin, SCG10 stabilizes microtubule plus ends (increasing growth rate) while destabilizing minus ends (increasing shortening rate and catastrophe frequency) at steady state in vitro; SCG10 binds along the length of purified microtubules.\",\n      \"method\": \"In vitro dynamic instability assay (video microscopy of individual microtubules), microtubule co-sedimentation/pull-down\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous reconstituted in vitro assay with single microtubule resolution, multiple conditions\",\n      \"pmids\": [\"17311410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SCG10 interacts with chromogranin A (CHGA) and co-localizes with it at the Golgi; siRNA knockdown of SCG10 virtually abolishes regulated secretion of a CHGA reporter, and a palmitoylation-deficient dominant negative SCG10 (C22A/C24A) blocks CHGA-EAP secretion. SCG10 knockdown decreases buoyant density of chromaffin granules.\",\n      \"method\": \"Phage display, co-immunoprecipitation, siRNA knockdown, dominant-negative mutant, secretion assay, density gradient fractionation\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, siRNA, and dominant negative functional assay, single lab\",\n      \"pmids\": [\"18549247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KBP (Kinesin Binding Protein) physically interacts with SCG10 (yeast two-hybrid, validated biochemically); in zebrafish, epistasis experiments demonstrate a genetic interaction between KBP and SCG10 in vivo, linking this interaction to the neuronal differentiation and microtubule-related defects of Goldberg-Shprintzen syndrome.\",\n      \"method\": \"Yeast two-hybrid, biochemical validation, zebrafish epistasis experiments\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid with in vivo epistasis in zebrafish, single lab\",\n      \"pmids\": [\"20621975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"JNK1 phosphorylation of SCG10 governs multipolar-stage exit and radial neuronal migration rate during cortical development; expressing a phosphomimetic SCG10 mutant rescued normal migration in JNK1-/- mouse embryos, placing JNK1-SCG10 phosphorylation as a key negative regulator of cortical neuron migration.\",\n      \"method\": \"Jnk1-/- mouse embryos, in utero electroporation of SCG10 phospho-mutants, live imaging of cortical migration\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue in JNK1 knockout with phosphomimetic mutant, replicated across multiple experiments\",\n      \"pmids\": [\"21297631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Calmyrin1 (CaMy1) directly and Ca2+-dependently binds SCG10 via its C-terminal domain (residues 99–192) interacting with SCG10's N-terminal domain (residues 1–35); CaMy1 interferes with SCG10's microtubule-polymerization inhibitory activity and inhibits SCG10-mediated neurite outgrowth in NGF-stimulated PC12 cells.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, proximity ligation assay, in vitro microtubule polymerization assay, PC12 neurite outgrowth assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal binding assays, reconstituted in vitro activity, and functional cell assay\",\n      \"pmids\": [\"21215777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SCG10 is an axonal JNK substrate that is rapidly lost from axons distal to injury via JNK-dependent phosphorylation targeting it for degradation; in healthy axons SCG10 undergoes JNK-dependent degradation and is replenished by fast axonal transport. Knockdown of SCG10 accelerates axon fragmentation, while maintaining SCG10 after injury promotes mitochondrial movement and delays degeneration.\",\n      \"method\": \"Mouse dorsal root ganglion axotomy model, pharmacological JNK inhibition, shRNA knockdown, lentiviral SCG10 overexpression, live mitochondrial imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic and pharmacological loss-of-function with quantified phenotypes, multiple orthogonal approaches\",\n      \"pmids\": [\"23188802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CB1 cannabinoid receptor activation recruits c-Jun N-terminal kinases to phosphorylate SCG10, promoting its rapid degradation in motile axons and microtubule stabilization; this leads to ectopic filopodia formation and altered axon morphology.\",\n      \"method\": \"THC exposure in fetal brain, proteomic analysis, pharmacological CB1 receptor manipulation, JNK inhibition, immunofluorescence\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification and pharmacological dissection, single lab\",\n      \"pmids\": [\"24469251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SCG10 directly interacts with the KFFEQ motif of the APP intracellular domain (co-IP, co-localization); SCG10 knockdown reduces α-cleavage products (sAPPα, CTFα) and increases Aβ1-40/1-42, while SCG10 elevation promotes APP accumulation in post-Golgi vesicles and on the cell surface, reducing amyloid plaques in APPswe/PS1dE9 mice. This effect requires palmitoylation-mediated membrane anchoring of SCG10.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, siRNA knockdown, overexpression, ELISA (Aβ measurement), in vivo mouse model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, loss/gain-of-function, and in vivo mouse model, single lab\",\n      \"pmids\": [\"23863461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PAK4 phosphorylates SCG10 at Ser50; phosphorylated SCG10 regulates microtubule dynamics to promote gastric cancer cell migration and invasion in vitro and metastasis in xenograft models.\",\n      \"method\": \"In vitro kinase assay, siRNA knockdown, PAK4 inhibitor, invasion/migration assays, xenograft mouse model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay, genetic and pharmacological knockdown, in vivo xenograft, single lab\",\n      \"pmids\": [\"23893240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Spy1 (a Speedy/RINGO family protein) binds SCG10 and mediates its phosphorylation and proteasomal degradation in a partly JNK-dependent manner after sciatic nerve injury; inhibition of Spy1 attenuates SCG10 phosphorylation and delays injury-induced axonal degeneration.\",\n      \"method\": \"Co-immunoprecipitation, sciatic nerve injury model, Spy1 inhibition, Western blot for SCG10 levels\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus in vivo nerve injury model with pharmacological inhibition, single lab\",\n      \"pmids\": [\"25869138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TDP-43 depletion in human motor neurons causes loss of STMN2 expression due to altered splicing (inclusion of a cryptic exon/premature polyadenylation). STMN2 is necessary for normal axonal outgrowth and regeneration; post-translational stabilization of STMN2 rescues neurite outgrowth and axon regeneration deficits caused by TDP-43 depletion.\",\n      \"method\": \"TDP-43 knockdown in iPSC-derived human motor neurons, RNA-seq, RT-PCR, axon regeneration assay, post-translational stabilization rescue\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human motor neuron model, RNA-seq, loss-of-function with rescue, multiple orthogonal methods\",\n      \"pmids\": [\"30643292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STMN2 modulates microtubule disassembly to disrupt the MT-Smad2/3 complex, facilitating Smad2/3 release, phosphorylation, and nuclear translocation even independent of TGFβ stimulation, thereby enhancing TGFβ signaling and promoting epithelial-mesenchymal transition in hepatocellular carcinoma.\",\n      \"method\": \"STMN2 overexpression/knockdown, immunofluorescence, co-immunoprecipitation, in vitro invasion assay, in vivo xenograft\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP for MT-Smad interaction, loss/gain-of-function with mechanistic readout, single lab\",\n      \"pmids\": [\"33705863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Homozygous loss-of-function Stmn2 mice exhibit neuromuscular junction denervation and fragmentation, muscle atrophy, impaired motor behavior, and neuronal microtubule dynamics imbalance in spinal cord; these phenotypes are rescued by BAC transgenesis of human STMN2, demonstrating that STMN2 is required for motor system maintenance.\",\n      \"method\": \"Gene-edited Stmn2 knockout mice, BAC transgenic rescue, NMJ histology, behavioral motor testing, immunofluorescence of microtubules\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular/behavioral phenotype and transgenic rescue, multiple orthogonal readouts\",\n      \"pmids\": [\"35294901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TDP-43 binding to a GU-rich region in STMN2 pre-mRNA sterically blocks recognition of a cryptic 3′ splice site. Targeting dCasRx or antisense oligonucleotides (ASOs) to this region suppressed cryptic splicing, restoring axonal regeneration and stathmin-2-dependent lysosome trafficking in TDP-43-deficient human motor neurons. In mice gene-edited to carry human STMN2 cryptic sequences, intrathecal ASO injection corrected pre-mRNA misprocessing and restored stathmin-2 levels.\",\n      \"method\": \"Biochemical TDP-43 binding assays, dCasRx targeting, ASO treatment, iPSC-derived motor neuron axonal regeneration assay, lysosome trafficking assay, humanized mouse model with CSF ASO injection\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mechanistic steric-blocking model validated by dCasRx and ASO rescue in cells and in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"36927019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Stress-induced nuclear TDP-43 condensation (requiring TDP-43 oligomerization and ATP, inhibited by RNA) transiently inactivates TDP-43, causing loss of interaction with protein binding partners and splicing loss-of-function; STMN2 splicing changes are especially prominent and persistent, leading to rapid STMN2 protein depletion early during stress.\",\n      \"method\": \"Confocal nanoscanning assay, co-immunoprecipitation, RNA splicing analysis, Western blot for STMN2 protein, ALS-linked TDP-43 mutants\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic dissection of condensation requirements with functional splicing readout, single lab\",\n      \"pmids\": [\"38941189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STMN2 is primarily degraded by the ubiquitin-proteasome system; its membrane-targeting N-terminal domain promotes fast turnover while its tubulin-binding stathmin-like domain promotes stabilization. Tubulin binds preferentially to soluble (non-membrane-bound) STMN2, reducing its targeting to trans-Golgi network membranes, suggesting STMN2 interconverts between a soluble tubulin-bound form and a membrane-bound tubulin-free form.\",\n      \"method\": \"Ubiquitin-proteasome inhibitor treatment, proximity labeling, pull-down assays, imaging in U2OS cells and iPSC-derived neurons, N-terminal domain deletion mutants\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution (pull-down), proximity labeling, mutagenesis, and multiple cell systems with orthogonal readouts\",\n      \"pmids\": [\"41171096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Depletion of SRSF7 (serine/arginine-rich splicing factor 7) in human iPSC-derived neurons decreases STMN2 abundance (but not TDP-43) and impairs axonal regeneration; this phenotype is rescued by exogenous STMN2, placing SRSF7 upstream of STMN2 in a pathway linking C9ORF72 poly-PR toxicity to axonal repair defects.\",\n      \"method\": \"SRSF7 siRNA knockdown in iPSC-derived neurons, STMN2 rescue experiment, axonal regeneration assay, global phospho-proteomics\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with rescue and defined phenotype, single lab\",\n      \"pmids\": [\"40140908\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STMN2 overexpression restores axonal growth defects in SMA patient iPSC-derived motor neurons; intracerebroventricular AAV9-Stmn2 delivery in SMA mice improves survival, motor function, and neuromuscular junction pathology.\",\n      \"method\": \"iPSC-derived motor neuron overexpression assay, AAV9 in vivo delivery in SMA mice, behavioral and histological assessment\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain-of-function with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"39725771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In zebrafish double stmn2a/stmn2b knockout larvae, loss of STMN2 impairs motor function, increases orphaned NMJs, reduces miniature endplate current amplitude, and impairs ventral root axon regrowth after transection, demonstrating STMN2 is required for NMJ assembly and axon regeneration but not motor axon development.\",\n      \"method\": \"CRISPR/Cas9 double knockout zebrafish, behavioral motor assay, NMJ immunohistochemistry, electrophysiology (mEPCs), axon transection/regeneration assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with multiple cellular and electrophysiological phenotypes, preprint not yet peer reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.10.24.684380\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"STMN2 is a direct transcriptional target of β-catenin/TCF signaling; chromatin immunoprecipitation and promoter mapping identified a critical TCF binding site at -1713 of the STMN2 promoter, and siRNA knockdown of STMN2 abolished anchorage-independent growth in β-catenin/TCF-activated hepatoma cells.\",\n      \"method\": \"Promoter deletion, ChIP assay, transient transfection, siRNA knockdown, soft agar colony assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP and promoter mapping with functional siRNA readout, single lab\",\n      \"pmids\": [\"16712787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Protocadherin-γ-b1 (and other Pcdhγ-b subfamily isoforms) interact with SCG10 as a cytoplasmic binding partner, and SCG10 and Pcdhγ-b1 are found together in neuronal growth cones.\",\n      \"method\": \"Yeast two-hybrid, co-localization in growth cones\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid with co-localization, no reciprocal co-IP or functional validation, single lab\",\n      \"pmids\": [\"15581637\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"BRI3 binds SCG10 (GST pull-down, co-IP) and blocks SCG10's ability to induce microtubule disassembly in vitro; co-expression of BRI3 attenuates SCG10-mediated neurite outgrowth in NGF-stimulated PC12 cells.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation, turbidimetric microtubule assay, PC12 neurite outgrowth assay\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro microtubule assay plus co-IP and functional cell assay, single lab\",\n      \"pmids\": [\"18452648\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STMN2 (SCG10) is a membrane-palmitoylated (at Cys22/Cys24), neuron-enriched microtubule-destabilizing protein that traffics from the trans-Golgi network to growth cones, where it promotes axonal outgrowth and regeneration by destabilizing microtubule minus ends while stabilizing plus ends; its activity is negatively regulated by phosphorylation at Ser50/Ser97 (PKA), Ser62/Ser73 (MAPK/JNK), with JNK1-mediated phosphorylation governing neuronal migration and axonal maintenance; nuclear TDP-43 sterically blocks a cryptic splice site in STMN2 pre-mRNA, so TDP-43 nuclear loss (as in ALS/FTD) causes cryptic splicing and STMN2 depletion, impairing axon regeneration and NMJ integrity; soluble STMN2 is stabilized by tubulin binding and degraded by the ubiquitin-proteasome system when released from both tubulin and membranes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STMN2 (SCG10) is a neuron-enriched, microtubule-destabilizing protein that traffics from the trans-Golgi network to growth cones, where it controls the microtubule dynamics underlying axonal outgrowth, guidance, and regeneration [#0, #3, #7]. It functions asymmetrically on microtubule ends, stabilizing plus ends while destabilizing minus ends, and binds along the microtubule lattice [#14]; loss- and gain-of-function in neurons confirm it tunes growth-cone microtubule morphology toward a dynamic state to permit neurite extension [#13]. Membrane association is conferred by an N-terminal domain whose palmitoylation at Cys22/Cys24 is required for Golgi sorting and growth-cone targeting [#4, #7], while the tubulin-binding stathmin-like domain stabilizes a soluble pool; STMN2 interconverts between a soluble tubulin-bound form and a membrane-bound tubulin-free form and is otherwise turned over by the ubiquitin-proteasome system [#29]. Its destabilizing activity is held in check by phosphorylation at Ser50/Ser97 (PKA) and Ser62/Ser73 (MAPK/JNK), with phosphomimetic mutants losing activity [#6]; JNK1-mediated phosphorylation specifically governs cortical neuron migration and axodendritic length in vivo [#12, #17], and JNK-dependent phosphorylation drives STMN2 degradation in axons, coupling its loss to injury-induced axon fragmentation [#19]. STMN2 is required for motor-system maintenance: knockout mice show neuromuscular junction denervation, muscle atrophy, and motor deficits rescued by human STMN2 [#26]. In ALS/FTD, nuclear TDP-43 binds a GU-rich region of STMN2 pre-mRNA to sterically block a cryptic 3' splice site; TDP-43 nuclear loss or stress-induced condensation triggers cryptic splicing and STMN2 depletion, impairing axon regeneration—a defect reversible by ASO or dCasRx targeting of the cryptic site [#24, #27, #28].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Established where STMN2 protein resides in neurons, the first clue that it acts at the growth cone rather than as a soluble cytoplasmic factor.\",\n      \"evidence\": \"Cell fractionation and immunocytochemistry in cultured neurons\",\n      \"pmids\": [\"3272176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular activity unknown at this stage\", \"Mode of membrane association undefined\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Explained how STMN2 achieves neuron-specific expression, identifying an NRSE/silencer derepression mechanism active in nonneuronal cells.\",\n      \"evidence\": \"Promoter deletion mapping, EMSA, point mutagenesis, and reporter assays\",\n      \"pmids\": [\"2322462\", \"1321646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the silencing factor not molecularly defined here\", \"Does not address protein function\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defined STMN2's core molecular activity as a microtubule destabilizer and linked it functionally to neurite outgrowth, while mapping the N-terminal palmitoylated domain that targets it to membranes/Golgi.\",\n      \"evidence\": \"In vitro microtubule assembly assays, neurite outgrowth in transfected cells, [3H]palmitate labeling, and fusion constructs\",\n      \"pmids\": [\"9012855\", \"9030585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"End-specific effects on microtubules not yet resolved\", \"In vivo neuronal requirement untested\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated that phosphorylation negatively regulates STMN2's destabilizing activity, mapping PKA (Ser50/Ser97) and MAPK/CDK (Ser62/Ser73) sites and validating with phospho-mutants.\",\n      \"evidence\": \"2D gels, mass spectrometry, in vitro kinase assays, mutagenesis, and cell microtubule disruption assays\",\n      \"pmids\": [\"9525956\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological kinase governing each site in vivo not yet assigned\", \"Connection to specific neuronal processes pending\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified direct binding partners (RGSZ1, RGS6) that modulate STMN2's microtubule activity, beginning to place it within signaling networks at the Golgi and during NGF-induced differentiation.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, co-IP, in vitro microtubule assays, and PC12 differentiation\",\n      \"pmids\": [\"11882662\", \"12140291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous relevance of these interactions in neurons unclear\", \"Opposite effects (inhibition vs potentiation) not mechanistically reconciled\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved STMN2's distinctive biochemistry, showing it stabilizes plus ends while destabilizing minus ends and binds along the lattice, distinguishing it from stathmin.\",\n      \"evidence\": \"In vitro dynamic instability assays at single-microtubule resolution and co-sedimentation\",\n      \"pmids\": [\"17311410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of end-specific activity unresolved\", \"Relevance to growth-cone microtubule arrays not directly tested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established JNK1-STMN2 phosphorylation as an in vivo regulator of cortical neuron migration and axodendritic length, moving the phospho-regulation from biochemistry to developmental physiology.\",\n      \"evidence\": \"Jnk1-/- mice, in utero electroporation of phospho-mutants, FRAP, and live cortical imaging\",\n      \"pmids\": [\"16618812\", \"21297631\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other kinases' developmental roles not dissected\", \"Downstream microtubule events in migrating neurons inferred\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed that JNK-dependent phosphorylation targets axonal STMN2 for degradation, coupling its loss to axon fragmentation and identifying it as a regulator of injury-induced degeneration.\",\n      \"evidence\": \"DRG axotomy, JNK inhibition, knockdown/overexpression, and live mitochondrial imaging\",\n      \"pmids\": [\"23188802\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating degradation not identified\", \"Link between STMN2 maintenance and mitochondrial transport mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected STMN2 to ALS/FTD by showing TDP-43 depletion causes cryptic splicing and STMN2 loss, and that STMN2 is required for axon regeneration with stabilization rescuing the deficit.\",\n      \"evidence\": \"TDP-43 knockdown in iPSC-derived motor neurons, RNA-seq, RT-PCR, and regeneration rescue\",\n      \"pmids\": [\"30643292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Steric mechanism of TDP-43 splice control not yet shown\", \"Therapeutic targeting not yet demonstrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided in vivo genetic proof that STMN2 is required for motor-system maintenance, with NMJ denervation and motor deficits rescued by human STMN2.\",\n      \"evidence\": \"Stmn2 knockout mice, BAC transgenic rescue, NMJ histology, behavioral testing\",\n      \"pmids\": [\"35294901\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous vs non-autonomous requirement not fully resolved\", \"Relationship to human disease dosage unaddressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined the molecular mechanism of TDP-43 splice regulation as steric blockade of a cryptic 3' splice site and demonstrated ASO/dCasRx correction in cells and humanized mice, establishing a therapeutic strategy.\",\n      \"evidence\": \"TDP-43 binding assays, dCasRx and ASO targeting, iPSC motor neuron and humanized mouse models with CSF ASO injection\",\n      \"pmids\": [\"36927019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term efficacy and safety not addressed\", \"Whether STMN2 restoration alone suffices in patients unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved STMN2's turnover logic, showing UPS degradation, an N-terminal domain promoting fast turnover, and a tubulin-bound soluble form versus a membrane-bound form, defining how its pools are partitioned.\",\n      \"evidence\": \"Proteasome inhibition, proximity labeling, pull-downs, and domain-deletion imaging in U2OS and iPSC neurons\",\n      \"pmids\": [\"41171096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific E3 ligase still unidentified\", \"Regulation of soluble/membrane interconversion in living axons unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How STMN2's end-specific microtubule activity, membrane/soluble interconversion, and phospho-degradation circuitry are integrated to enable axon regeneration in disease contexts remains to be fully assembled.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No identified E3 ligase for STMN2\", \"No structural model explaining plus-end stabilization vs minus-end destabilization\", \"Causal contribution of STMN2 loss versus other TDP-43 targets to ALS pathology unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3, 14, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 14, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 14]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 17, 13]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [24, 27, 28]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 19, 29]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TUBB\", \"TARDBP\", \"RGS6\", \"RGSZ1\", \"KIF1BP\", \"CIB1\", \"BRI3\", \"SRSF7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}