{"gene":"DPYSL5","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2000,"finding":"CRMP5 (DPYSL5) was identified as a novel CRMP family member that interacts with dihydropyrimidinase and all CRMPs (CRMP2, CRMP3, CRMP4, CRMP5 itself) except CRMP1, forming hetero-multimeric complexes. These interactions were demonstrated by yeast two-hybrid and co-immunoprecipitation, suggesting CRMP complexes in developing nervous system can be classified into two populations: those containing CRMP1 and those containing CRMP5.","method":"Yeast two-hybrid screening, co-immunoprecipitation in COS-7 cells, Northern blot, in situ hybridization","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal yeast two-hybrid and co-IP from a single lab with two orthogonal binding methods","pmids":["10956643"],"is_preprint":false},{"year":2000,"finding":"CRAM (CRMP5/DPYSL5) was identified as a CRMP3-associated molecule that physically associates with CRMP3 when co-expressed in COS-7 cells, forms a large complex with CRMP3 and other unidentified proteins in vivo, and co-immunoprecipitates with proteins containing protein-tyrosine kinase activity from rat brain extracts, indicating it interacts with tyrosine kinases in developing brain.","method":"Co-immunoprecipitation from rat brain extracts and COS-7 cells, immunoprecipitation with kinase activity assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP in vivo and in cell overexpression, kinase activity assay, single lab with two orthogonal methods","pmids":["10851247"],"is_preprint":false},{"year":2001,"finding":"Ulip6/CRMP5 (DPYSL5) mediates semaphorin-3A (Sema3A) signaling in adult oligodendrocytes. In the presence of Sema3A, oligodendrocytes (which express neuropilin-1 and CRMP5) showed dramatic reduction in process extension; this was prevented by anti-neuropilin-1, anti-CRMP5, or anti-CRMP2 antibodies, or VEGF-165 (another neuropilin-1 ligand), establishing CRMP5 as a downstream mediator of Sema3A/neuropilin-1 signaling controlling oligodendrocyte process extension.","method":"Primary adult rat oligodendrocyte culture, Sema3A-conditioned medium treatment, antibody blockade experiments, process extension quantification","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional blockade with specific antibodies in primary cell culture, single lab, multiple inhibitor conditions","pmids":["11549731"],"is_preprint":false},{"year":2003,"finding":"M-septin (a mitochondrial septin) was identified as a CRMP/CRAM interacting protein from developing rat brain. M-septin specifically induces mitochondrial translocation of CRAM (CRMP5) but not CRMP2, and is transiently localized to mitochondria before neurite induction, dissociating after neurite extension, suggesting CRMP5 participates in neuronal differentiation via mitochondrial pathway.","method":"Yeast two-hybrid screening, co-immunoprecipitation, subcellular fractionation, immunofluorescence in COS-7 and P19 cells","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-IP plus localization imaging, single lab","pmids":["12581152"],"is_preprint":false},{"year":2004,"finding":"CRAM (CRMP5/DPYSL5) localizes to filopodia of growth cones independently of filamentous actin. Overexpression promotes filopodial growth and supernumerary growth cone formation, and confers resistance to semaphorin-3A-induced growth cone collapse. RNAi knockdown of CRAM blocks filopodial formation and causes aberrant growth cone morphology, establishing CRMP5 as a regulator of filopodial dynamics and growth cone response to repulsive guidance cues.","method":"Immunohistochemistry, cytochalasin D treatment, overexpression in neuronal cells, RNAi knockdown, Sema-3A stimulation assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function (RNAi) and gain-of-function with defined morphological readout, pharmacological validation, multiple orthogonal approaches in single study","pmids":["15509652"],"is_preprint":false},{"year":2005,"finding":"In adult mouse brain, CRMP5 localizes predominantly to dendrites of specific neuronal populations (cortical pyramidal neurons, hippocampal CA1 pyramidal cells, Purkinje cerebellar cells), in contrast to CRMP2A which is axon-specific. In oligodendrocytes, CRMP5 localizes to cell bodies and processes. This cell-type-specific and compartment-specific localization was established by immunostaining with specific antibodies.","method":"Immunohistochemistry with isoform-specific antibodies in brain sections; primary cortical and Purkinje cell cultures","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by specific antibodies replicated across multiple brain regions and culture systems, single lab","pmids":["15834957"],"is_preprint":false},{"year":2010,"finding":"CRMP5 inhibits tubulin polymerization and neurite outgrowth, in contrast to CRMP2 which promotes these processes. CRMP5 forms a ternary complex with MAP2 and tubulin; residues 475-522 of CRMP5 are required for tubulin binding. siRNA knockdown of CRMP5 confirms its inhibitory function. When both CRMP5 and CRMP2 are co-expressed, CRMP5's inhibitory effect dominates (acts as a dominant signal over CRMP2). In hippocampal neurons, CRMP5 specifically inhibits dendrite outgrowth and formation at early developmental stages via its tubulin-binding activity.","method":"In vitro tubulin polymerization assay, siRNA knockdown, overexpression of truncated CRMP5 constructs, hippocampal neuron culture, co-immunoprecipitation for ternary complex","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution (tubulin polymerization), domain mapping by truncation mutagenesis, siRNA, and neuronal phenotype readout in single study","pmids":["20702696"],"is_preprint":false},{"year":2011,"finding":"CRMP5-deficient (crmp5-/-) mice show aberrant Purkinje cell dendrite morphology (decreased soma size and primary dendrite diameter) at P21 and P28 but not P14. Loss of CRMP5 impairs long-term depression (LTD) at parallel fiber-Purkinje cell synapses. CRMP5 is tyrosine phosphorylated when co-expressed with TrkB (BDNF receptor) in HEK293T cells, and the BDNF-induced dendritic branching effect is markedly attenuated in crmp5-/- neurons, placing CRMP5 in the BDNF/TrkB signaling pathway for dendritic development.","method":"crmp5-/- mouse generation, anti-calbindin immunofluorescence, cerebellar slice LTD electrophysiology, HEK293T co-expression with TrkB for tyrosine phosphorylation, cultured neuron BDNF treatment","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic KO with specific morphological and synaptic phenotypes, biochemical phosphorylation assay, BDNF functional test; multiple orthogonal methods","pmids":["21289187"],"is_preprint":false},{"year":2013,"finding":"CRMP5 is present in vivo in brain mitochondria and is targeted to the inner mitochondrial membrane. Mitochondrial localization of CRMP5 induces mitophagy: CRMP5 overexpression triggers mitochondrial morphology changes, increases lysosomes and autophagosomes, enhances LC3 (lipidated LC3-II form) at mitochondria, and causes autophagosome-lysosome fusion leading to lysosomal degradation of mitochondria. Endogenous CRMP5 expression level inversely correlates with mitochondrial content in developing neurons, and CRMP5 knockdown increases mitochondrial numbers in dendrites.","method":"Subcellular fractionation (mitochondrial fraction), immunofluorescence, LC3 lipidation assay, electron microscopy (double membrane vesicles), siRNA knockdown, overexpression in neuronal cultures","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical fractionation, multiple ultrastructural and autophagy markers, loss-of-function and gain-of-function in neurons, single lab with multiple orthogonal methods","pmids":["24324268"],"is_preprint":false},{"year":2013,"finding":"A short nuclear isoform of CRMP5, derived from C-terminal processing, localizes to the nucleus of cancer cells (glioblastoma, H69, GL15) via a nuclear localization signal (NLS) with essential residue K391 (identified by mutational analysis). In cancer cells, cytosolic CRMP5 does not interact with tubulin (unlike during normal development), enabling C-terminal truncation and nuclear translocation. The nuclear CRMP5 isoform increases cell proliferation.","method":"Mutational analysis of NLS (K391), immunofluorescence in human GBM biopsies and cancer cell lines, co-immunoprecipitation for tubulin interaction, cell proliferation assay","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutational analysis of NLS plus localization and proliferation assay, single lab","pmids":["23298946"],"is_preprint":false},{"year":2014,"finding":"Phosphorylation of CRMP5 at Threonine 516 (T516) by GSK-3β is required for neurite outgrowth inhibition. Non-phosphorylatable T516 mutant loses inhibitory function; phosphomimetic T516 mutant retains inhibitory function. T516 phosphorylation is essential for the tubulin-binding property of CRMP5. Other identified phosphorylation sites (T509, T514, S534) are not required for this function.","method":"Mutational analysis of phosphorylation sites (T509, T514, T516, S534), non-phosphorylatable and phosphomimetic constructs, PC12 and hippocampal neuron neurite outgrowth assay, GSK-3β kinase assay","journal":"The European journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis with defined gain/loss of function, kinase identification (GSK-3β), tubulin-binding assay linked to phosphorylation state","pmids":["25040932"],"is_preprint":false},{"year":2015,"finding":"CRMP5 controls GBM cell proliferation and survival through Notch-dependent signaling. Elevated CRMP5 promotes Notch receptor expression and Akt activation. Mechanistically, CRMP5 prevents Itch-dependent lysosomal degradation of Notch receptors, thereby stabilizing Notch signaling in GBM cells and GBM stem cells.","method":"Overexpression and knockdown in GBM cell lines and GBM stem cells, GBM xenograft, Western blot for Notch/Akt, Itch-dependent degradation assay, GBM biopsy immunostaining","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with mechanistic link to Notch degradation pathway, single lab, multiple cell types","pmids":["26122847"],"is_preprint":false},{"year":2015,"finding":"CRMP-5 interacts with actin in addition to tubulin in growth cones of developing hippocampal neurons. Co-immunoprecipitation shows CRMP-5 binds actin, with higher affinity for actin than microtubules. CRMP-5 colocalizes with actin predominantly in the C-domain and T-zone of growth cones. siRNA knockdown of CRMP-5 suppresses actin expression, growth cone development, and neurite outgrowth; overexpression promotes these processes.","method":"Co-immunoprecipitation from hippocampal neurons, immunocytochemistry, siRNA knockdown, overexpression","journal":"Molecular medicine reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP plus functional siRNA/overexpression in neurons, single lab, two orthogonal methods","pmids":["26677106"],"is_preprint":false},{"year":2017,"finding":"Sox5 transcription factor directly regulates CRMP5 expression. Sox5 increases CRMP5 promoter activity via a Sox5 consensus binding sequence upstream of the CRMP5 gene; mutation of this site abolishes activation. Sox5 physically binds to the CRMP5 promoter DNA (gel mobility shift and ChIP assays). Sox5 upregulates CRMP5 transcript and protein in N1E115 cells; Sox5-induced neurite outgrowth inhibition requires CRMP5 (CRMP5 knockdown prevents Sox5 effect). Confirmed in mouse primary hippocampal neurons.","method":"Luciferase reporter assay, gel mobility shift assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, RT-PCR and immunocytochemistry, primary hippocampal neurons","journal":"Cellular and molecular life sciences","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ChIP, gel shift, luciferase assay with site mutation, and functional rescue/knockdown in neurons; multiple orthogonal methods in single study","pmids":["28864883"],"is_preprint":false},{"year":2018,"finding":"Spastin (microtubule-severing protein) interacts with CRMP5 both in vitro and in vivo. The binding domain of spastin is residues 270-328 (N-terminal fragment) and of CRMP5 is residues 472-564 (C-terminal fragment). CRMP5 promotes microtubule polymerization which interferes with microtubule-severing function of spastin. Co-transfection of spastin and CRMP5 promotes neurite outgrowth (both dendrites and axons) in hippocampal neurons beyond either alone.","method":"Co-immunoprecipitation in vitro and in vivo, domain mapping by truncation mutants, microtubule polymerization assay, siRNA knockdown, overexpression in hippocampal neurons","journal":"Developmental neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal domain mapping, in vitro and in vivo binding, functional assay in neurons, single lab","pmids":["30257070"],"is_preprint":false},{"year":2019,"finding":"CRMP5 regulates AMPA receptor surface trafficking; specifically, CRMP5 can regulate surface GluA2 levels and GluA2 S880 phosphorylation. In 3xTg-AD mice, elevated hippocampal CRMP5 is associated with social deficits and memory loss; CRMP5 knockdown reverses social deficits and rescues memory impairment, while CRMP5 overexpression accelerates memory loss and decreases social interaction.","method":"Lentiviral CRMP5 knockdown/overexpression in mice, behavioral assays (social interaction, memory), Western blot for surface GluA2 and GluA2-S880 phosphorylation","journal":"Neuropharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss/gain-of-function with defined behavioral and molecular (AMPAR trafficking) readout, single lab","pmids":["31233825"],"is_preprint":false},{"year":2021,"finding":"Missense mutations in DPYSL5 (p.Glu41Lys and p.Gly47Arg), located in the same surface loop of DPYSL5 monomers and oligomers, impair dendritic outgrowth in hippocampal neurons and reduce the interaction of DPYSL5 with MAP2 and βIII-tubulin, preventing formation of the ternary DPYSL5/MAP2/βIII-tubulin complex required for normal dendritic outgrowth regulation. These de novo variants cause brain malformations including corpus callosum agenesis in humans.","method":"Functional analysis of missense mutants in primary hippocampal neurons (dendritic outgrowth), co-immunoprecipitation for MAP2 and βIII-tubulin interaction, structural localization of mutations on DPYSL5 oligomer surface","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — disease-variant functional validation with mutant proteins, binding assay, neuronal phenotype, structural localization; multiple orthogonal methods","pmids":["33894126"],"is_preprint":false},{"year":2023,"finding":"Elevated hippocampal CRMP5 causes chronic stress-induced cognitive deficits by: (1) disrupting synaptic plasticity through glucocorticoid receptor (GR) phosphorylation-dependent mechanisms, (2) impairing AMPAR (GluA2) trafficking, and (3) triggering cytokine release. shRNA-mediated CRMP5 knockdown rescues CUS-induced cognitive impairment; lentiviral CRMP5 overexpression exacerbates memory decline after subthreshold stress.","method":"Chronic unpredictable stress (CUS) mouse model, shRNA and lentiviral CRMP5 manipulation, synaptic plasticity assays, AMPAR trafficking, cytokine measurement, GR phosphorylation Western blot","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain/loss-of-function with multiple molecular readouts (GR, AMPAR, cytokines), single lab","pmids":["36902337"],"is_preprint":false},{"year":2024,"finding":"DPYSL5 promotes prostate cancer cell plasticity (neuroendocrine transformation) via EZH2-mediated PRC2 activation. Androgen receptor (AR) suppresses DPYSL5, providing a mechanism for neuroendocrine transformation under androgen deprivation therapy. DPYSL5 overexpression induces neuron-like phenotype, enhances invasion and proliferation, upregulates stemness and NE markers; depletion decreases proliferation, induces G1 arrest, reverses NE phenotype, and upregulates luminal genes. The AR/DPYSL5/EZH2/PRC2 axis was proposed and supported mechanistically.","method":"Overexpression and siRNA knockdown in prostate cancer cells, EZH2/PRC2 activity assay, cell cycle analysis, patient tumor cohort (135 samples including 55 t-NEPC) for correlation","journal":"Communications biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with pathway (EZH2/PRC2) mechanistic follow-up, single lab, multiple orthogonal methods","pmids":["38238517"],"is_preprint":false},{"year":2024,"finding":"ATM (ataxia-telangiectasia mutated kinase) phosphorylates CRMP5 as a substrate; ATM depletion leads to reduced CRMP5 phosphorylation (identified by phosphoproteomics), ATM physically associates with CRMP5, and ATM-null conditions result in stabilized microtubules and neurite retraction, implicating CRMP5 in the semaphorin-CRMP5-microtubule signaling axis downstream of ATM.","method":"Global proteome and phosphoproteomics of ATM-null mouse cerebellum and human neuroblastoma cells, co-immunoprecipitation (ATM-CRMP5 association), microtubule stabilization assay, neurite retraction measurement","journal":"Neurobiology of disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphoproteomics plus co-IP validation plus functional microtubule assay, single study","pmids":["39615799"],"is_preprint":false},{"year":2025,"finding":"Patient-derived CV2/CRMP5 autoantibodies bind to CRMP5 antigen on rat dorsal root ganglion (DRG) neurons and superficial laminae of the spinal cord, induce DRG neuron hyperexcitability and mechanical hypersensitivity in vivo. Preventing antibody binding to CRMP5 abolishes these effects. Anti-CD20 B cell depletion in immunized rats ameliorates autoimmunity and neuropathy, establishing a direct mechanism for antibody-mediated nociceptor sensitization.","method":"Patient-derived antibody injection into rats, DRG electrophysiology (neuron hyperexcitability), mechanical hypersensitivity behavioral testing, DNA vaccine immunization model, anti-CD20 depletion therapy","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived antibodies replicated in genetic immunization model, electrophysiological mechanistic readout, therapeutic intervention confirms mechanism, multiple orthogonal approaches","pmids":["40775229"],"is_preprint":false},{"year":2025,"finding":"Novel DPYSL5 missense variants (including recurrent p.Glu41Lys, novel recurrent p.Glu25Lys, and others) impair dendritic arborization, axonal elongation, and synaptic density in both mouse embryonic primary neuronal cultures and hiPSC-derived human neural stem cells, demonstrating a fundamental role of DPYSL5 in neuronal maturation.","method":"Mouse embryonic primary neuronal cultures, hiPSC-derived human neural stem cells, morphological analysis of dendritic arborization, axonal elongation, synaptic density with variant DPYSL5 proteins","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional characterization of disease variants in two independent model systems (mouse and human iPSC-derived), single study","pmids":["41286434"],"is_preprint":false}],"current_model":"DPYSL5/CRMP5 is a cytosolic phosphoprotein that inhibits tubulin polymerization and dendrite outgrowth (via a ternary complex with MAP2 and tubulin requiring residues 475–522 and GSK-3β-mediated T516 phosphorylation), antagonizes pro-outgrowth CRMP2 function, localizes to inner mitochondrial membranes to induce mitophagy, mediates Sema3A/neuropilin-1 repulsive signaling in oligodendrocytes and growth cones, interacts with spastin to coordinate microtubule severing and polymerization during neurite growth, is transcriptionally activated by Sox5, is phosphorylated by ATM and TrkB, promotes Notch receptor stabilization and EZH2/PRC2 activation in cancer contexts, and—when targeted by patient-derived autoantibodies—directly sensitizes DRG nociceptors to cause neuropathic pain."},"narrative":{"mechanistic_narrative":"DPYSL5 (CRMP5) is a cytosolic phosphoprotein of the collapsin response mediator family that acts as a negative regulator of neurite and dendrite outgrowth during nervous system development [PMID:10956643, PMID:20702696]. Unlike the pro-outgrowth CRMP2, CRMP5 inhibits tubulin polymerization by forming a ternary complex with MAP2 and βIII-tubulin through its C-terminal residues 475–522, and its inhibitory effect dominates when both proteins are co-expressed [PMID:20702696]. This tubulin-binding activity requires GSK-3β-mediated phosphorylation at Threonine 516 [PMID:25040932]. CRMP5 functions as a downstream mediator of Sema3A/neuropilin-1 repulsive guidance signaling, controlling process extension in oligodendrocytes and filopodial dynamics in growth cones [PMID:11549731, PMID:15509652], and it coordinates microtubule dynamics with the severing protein spastin during neurite growth [PMID:30257070]. Its expression is transcriptionally activated by Sox5, which requires CRMP5 to exert outgrowth inhibition [PMID:28864883]. Beyond the cytoskeleton, CRMP5 localizes to the inner mitochondrial membrane and drives mitophagy, inversely controlling mitochondrial content in developing neurons [PMID:24324268]. De novo missense variants in DPYSL5 (e.g. p.Glu41Lys, p.Gly47Arg) disrupt the DPYSL5/MAP2/βIII-tubulin complex and impair dendritic and axonal maturation, causing brain malformations including corpus callosum agenesis [PMID:33894126, PMID:41286434]. In cancer, CRMP5 stabilizes Notch receptors by blocking Itch-dependent degradation to promote glioblastoma proliferation [PMID:26122847] and drives prostate neuroendocrine transformation through an AR/DPYSL5/EZH2/PRC2 axis [PMID:38238517]. Patient-derived CV2/CRMP5 autoantibodies bind CRMP5 on dorsal root ganglion neurons to sensitize nociceptors and cause neuropathic pain [PMID:40775229].","teleology":[{"year":2000,"claim":"Establishing CRMP5 as a distinct CRMP family member that forms hetero-multimeric complexes defined how it might integrate into the CRMP signaling network of the developing brain.","evidence":"Yeast two-hybrid and co-IP in COS-7 cells showing interaction with dihydropyrimidinase and CRMP2/3/4 but not CRMP1; parallel identification as a CRMP3/tyrosine-kinase-associated molecule in rat brain","pmids":["10956643","10851247"],"confidence":"Medium","gaps":["Functional consequence of hetero-complex formation not defined","Identity of the associated tyrosine kinases not established"]},{"year":2001,"claim":"Placing CRMP5 downstream of Sema3A/neuropilin-1 answered how repulsive guidance cues are transduced to inhibit glial and neuronal process extension.","evidence":"Antibody blockade against neuropilin-1, CRMP5, and CRMP2 in primary adult oligodendrocyte cultures with Sema3A-conditioned medium","pmids":["11549731"],"confidence":"Medium","gaps":["Direct molecular link between neuropilin-1 and CRMP5 not mapped","Antibody blockade does not reveal intracellular signaling steps"]},{"year":2004,"claim":"Loss- and gain-of-function at the growth cone showed CRMP5 directly governs filopodial dynamics and the response to repulsive cues.","evidence":"RNAi knockdown, overexpression, cytochalasin D treatment, and Sema3A collapse assays in neuronal cells","pmids":["15509652"],"confidence":"High","gaps":["Molecular basis of actin-independent filopodial localization unresolved","Link to tubulin regulation not yet made at this stage"]},{"year":2010,"claim":"Biochemical reconstitution and domain mapping resolved CRMP5's core mechanism: inhibition of tubulin polymerization via a MAP2/tubulin ternary complex, opposing CRMP2.","evidence":"In vitro tubulin polymerization assay, truncation mutagenesis (residues 475-522), siRNA, and hippocampal neuron dendrite assays","pmids":["20702696"],"confidence":"High","gaps":["Regulation of the switch between inhibitory and permissive states not defined","Structural basis of ternary complex not solved"]},{"year":2014,"claim":"Identifying GSK-3β phosphorylation of T516 as essential for tubulin binding established the post-translational switch controlling CRMP5 inhibitory activity.","evidence":"Phospho-site mutagenesis (non-phosphorylatable vs phosphomimetic), GSK-3β kinase assay, and neurite outgrowth assays in PC12 and hippocampal neurons","pmids":["25040932"],"confidence":"High","gaps":["Upstream signals controlling GSK-3β toward CRMP5 not defined","Whether other kinases modulate the same site in vivo unresolved"]},{"year":2013,"claim":"Discovery of inner-mitochondrial CRMP5 driving mitophagy revealed a cytoskeleton-independent role in controlling neuronal mitochondrial content.","evidence":"Subcellular fractionation, LC3 lipidation, electron microscopy, and siRNA/overexpression in neurons","pmids":["24324268"],"confidence":"High","gaps":["Mechanism targeting CRMP5 to the inner membrane unresolved","Relationship between mitophagy role and tubulin role not integrated"]},{"year":2011,"claim":"A knockout mouse linked CRMP5 to dendritic morphology, synaptic plasticity, and BDNF/TrkB signaling, anchoring its developmental function in vivo.","evidence":"crmp5-/- mice with Purkinje cell morphology and LTD analysis, plus TrkB co-expression tyrosine phosphorylation in HEK293T","pmids":["21289187"],"confidence":"High","gaps":["Site and functional role of TrkB-induced tyrosine phosphorylation not mapped","Cell-autonomy of synaptic phenotype not established"]},{"year":2017,"claim":"Identifying Sox5 as a direct transcriptional activator showed how CRMP5 outgrowth-inhibitory function is engaged at the gene-regulatory level.","evidence":"ChIP, gel shift, luciferase reporter with promoter site mutation, and CRMP5 knockdown rescue in N1E115 and hippocampal neurons","pmids":["28864883"],"confidence":"High","gaps":["Other transcriptional inputs to DPYSL5 not characterized","Temporal regulation during development not defined"]},{"year":2018,"claim":"The spastin interaction explained how CRMP5 coordinates microtubule severing with polymerization, with the combination promoting net neurite growth.","evidence":"Reciprocal domain-mapped co-IP, microtubule polymerization assay, and co-transfection in hippocampal neurons","pmids":["30257070"],"confidence":"Medium","gaps":["In vivo relevance of the spastin-CRMP5 partnership not tested","Reconciliation with CRMP5's inhibitory role under other conditions unclear"]},{"year":2021,"claim":"Functional validation of de novo DPYSL5 missense variants established a causative link to human brain malformations through disruption of the MAP2/tubulin complex.","evidence":"Mutant proteins (p.Glu41Lys, p.Gly47Arg) in hippocampal neuron dendrite assays, co-IP for MAP2/βIII-tubulin, and surface mapping on oligomers","pmids":["33894126"],"confidence":"High","gaps":["Full genotype-phenotype spectrum not delineated","Whether variants alter mitochondrial or other functions not tested"]},{"year":2024,"claim":"Cancer studies extended CRMP5 mechanism beyond neurons, defining roles in Notch stabilization, EZH2/PRC2-driven neuroendocrine plasticity, and AR-regulated transcription.","evidence":"Gain/loss-of-function in glioblastoma and prostate cancer cells with Notch/Itch degradation assays, EZH2/PRC2 activity, cell cycle analysis, and patient cohorts","pmids":["26122847","38238517"],"confidence":"Medium","gaps":["Direct physical interaction of CRMP5 with Notch/EZH2 machinery not fully resolved","Relationship between cytosolic, nuclear, and cancer functions not unified"]},{"year":2025,"claim":"Demonstrating that CV2/CRMP5 autoantibodies directly sensitize DRG nociceptors established an antibody-mediated mechanism for paraneoplastic neuropathic pain.","evidence":"Patient-derived antibody injection, DRG electrophysiology, mechanical hypersensitivity, DNA vaccine immunization, and anti-CD20 B cell depletion in rats","pmids":["40775229"],"confidence":"High","gaps":["Intracellular consequence of autoantibody binding to a cytosolic antigen not mechanistically explained","How surface accessibility of CRMP5 on DRG neurons arises unresolved"]},{"year":null,"claim":"How CRMP5's distinct functional pools — cytosolic tubulin inhibition, mitochondrial mitophagy, nuclear/cancer signaling, and autoantibody target — are coordinated within a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating tubulin, mitochondrial, and nuclear roles","Switch governing subcellular partitioning unknown","Phosphorylation code linking GSK-3β, TrkB, and ATM inputs not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,10,14,12]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[6,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,4]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,9]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[8,3]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,6,12]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,4,6,16]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,11]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[7,15]}],"complexes":["DPYSL5/MAP2/βIII-tubulin ternary complex"],"partners":["CRMP2","CRMP3","MAP2","TUBB3","SPAST","TRKB","ATM","SOX5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BPU6","full_name":"Dihydropyrimidinase-related protein 5","aliases":["CRMP3-associated molecule","CRAM","Collapsin response mediator protein 5","CRMP-5","UNC33-like phosphoprotein 6","ULIP-6"],"length_aa":564,"mass_kda":61.4,"function":"Involved in the negative regulation of dendrite outgrowth","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9BPU6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DPYSL5","classification":"Not 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Patient: A Rare Paraneoplastic Phenomenon.","date":"2024","source":"Cureus","url":"https://pubmed.ncbi.nlm.nih.gov/39720375","citation_count":0,"is_preprint":false},{"pmid":"41291493","id":"PMC_41291493","title":"Lambert-Eaton myasthenic syndrome presenting with occult mediastinal small cell carcinoma and positivity for anti-CV2/CRMP5 and anti-SOX1 antibodies: a case report.","date":"2025","source":"BMC neurology","url":"https://pubmed.ncbi.nlm.nih.gov/41291493","citation_count":0,"is_preprint":false},{"pmid":"31118171","id":"PMC_31118171","title":"Inflammatory flaccid myelitis in a patient with both anti-CRMP-5 IgG and CNS HIV escape.","date":"2019","source":"BMJ case reports","url":"https://pubmed.ncbi.nlm.nih.gov/31118171","citation_count":0,"is_preprint":false},{"pmid":"40109803","id":"PMC_40109803","title":"Reforming Cancer Multidisciplinary Team Meetings: Introducing a Novel Clinical Radiological Assessment Meeting (CRAM) to Reduce Response Times and 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member that interacts with dihydropyrimidinase and all CRMPs (CRMP2, CRMP3, CRMP4, CRMP5 itself) except CRMP1, forming hetero-multimeric complexes. These interactions were demonstrated by yeast two-hybrid and co-immunoprecipitation, suggesting CRMP complexes in developing nervous system can be classified into two populations: those containing CRMP1 and those containing CRMP5.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation in COS-7 cells, Northern blot, in situ hybridization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal yeast two-hybrid and co-IP from a single lab with two orthogonal binding methods\",\n      \"pmids\": [\"10956643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CRAM (CRMP5/DPYSL5) was identified as a CRMP3-associated molecule that physically associates with CRMP3 when co-expressed in COS-7 cells, forms a large complex with CRMP3 and other unidentified proteins in vivo, and co-immunoprecipitates with proteins containing protein-tyrosine kinase activity from rat brain extracts, indicating it interacts with tyrosine kinases in developing brain.\",\n      \"method\": \"Co-immunoprecipitation from rat brain extracts and COS-7 cells, immunoprecipitation with kinase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP in vivo and in cell overexpression, kinase activity assay, single lab with two orthogonal methods\",\n      \"pmids\": [\"10851247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Ulip6/CRMP5 (DPYSL5) mediates semaphorin-3A (Sema3A) signaling in adult oligodendrocytes. In the presence of Sema3A, oligodendrocytes (which express neuropilin-1 and CRMP5) showed dramatic reduction in process extension; this was prevented by anti-neuropilin-1, anti-CRMP5, or anti-CRMP2 antibodies, or VEGF-165 (another neuropilin-1 ligand), establishing CRMP5 as a downstream mediator of Sema3A/neuropilin-1 signaling controlling oligodendrocyte process extension.\",\n      \"method\": \"Primary adult rat oligodendrocyte culture, Sema3A-conditioned medium treatment, antibody blockade experiments, process extension quantification\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional blockade with specific antibodies in primary cell culture, single lab, multiple inhibitor conditions\",\n      \"pmids\": [\"11549731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"M-septin (a mitochondrial septin) was identified as a CRMP/CRAM interacting protein from developing rat brain. M-septin specifically induces mitochondrial translocation of CRAM (CRMP5) but not CRMP2, and is transiently localized to mitochondria before neurite induction, dissociating after neurite extension, suggesting CRMP5 participates in neuronal differentiation via mitochondrial pathway.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, subcellular fractionation, immunofluorescence in COS-7 and P19 cells\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-IP plus localization imaging, single lab\",\n      \"pmids\": [\"12581152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CRAM (CRMP5/DPYSL5) localizes to filopodia of growth cones independently of filamentous actin. Overexpression promotes filopodial growth and supernumerary growth cone formation, and confers resistance to semaphorin-3A-induced growth cone collapse. RNAi knockdown of CRAM blocks filopodial formation and causes aberrant growth cone morphology, establishing CRMP5 as a regulator of filopodial dynamics and growth cone response to repulsive guidance cues.\",\n      \"method\": \"Immunohistochemistry, cytochalasin D treatment, overexpression in neuronal cells, RNAi knockdown, Sema-3A stimulation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function (RNAi) and gain-of-function with defined morphological readout, pharmacological validation, multiple orthogonal approaches in single study\",\n      \"pmids\": [\"15509652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In adult mouse brain, CRMP5 localizes predominantly to dendrites of specific neuronal populations (cortical pyramidal neurons, hippocampal CA1 pyramidal cells, Purkinje cerebellar cells), in contrast to CRMP2A which is axon-specific. In oligodendrocytes, CRMP5 localizes to cell bodies and processes. This cell-type-specific and compartment-specific localization was established by immunostaining with specific antibodies.\",\n      \"method\": \"Immunohistochemistry with isoform-specific antibodies in brain sections; primary cortical and Purkinje cell cultures\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by specific antibodies replicated across multiple brain regions and culture systems, single lab\",\n      \"pmids\": [\"15834957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CRMP5 inhibits tubulin polymerization and neurite outgrowth, in contrast to CRMP2 which promotes these processes. CRMP5 forms a ternary complex with MAP2 and tubulin; residues 475-522 of CRMP5 are required for tubulin binding. siRNA knockdown of CRMP5 confirms its inhibitory function. When both CRMP5 and CRMP2 are co-expressed, CRMP5's inhibitory effect dominates (acts as a dominant signal over CRMP2). In hippocampal neurons, CRMP5 specifically inhibits dendrite outgrowth and formation at early developmental stages via its tubulin-binding activity.\",\n      \"method\": \"In vitro tubulin polymerization assay, siRNA knockdown, overexpression of truncated CRMP5 constructs, hippocampal neuron culture, co-immunoprecipitation for ternary complex\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution (tubulin polymerization), domain mapping by truncation mutagenesis, siRNA, and neuronal phenotype readout in single study\",\n      \"pmids\": [\"20702696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CRMP5-deficient (crmp5-/-) mice show aberrant Purkinje cell dendrite morphology (decreased soma size and primary dendrite diameter) at P21 and P28 but not P14. Loss of CRMP5 impairs long-term depression (LTD) at parallel fiber-Purkinje cell synapses. CRMP5 is tyrosine phosphorylated when co-expressed with TrkB (BDNF receptor) in HEK293T cells, and the BDNF-induced dendritic branching effect is markedly attenuated in crmp5-/- neurons, placing CRMP5 in the BDNF/TrkB signaling pathway for dendritic development.\",\n      \"method\": \"crmp5-/- mouse generation, anti-calbindin immunofluorescence, cerebellar slice LTD electrophysiology, HEK293T co-expression with TrkB for tyrosine phosphorylation, cultured neuron BDNF treatment\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic KO with specific morphological and synaptic phenotypes, biochemical phosphorylation assay, BDNF functional test; multiple orthogonal methods\",\n      \"pmids\": [\"21289187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRMP5 is present in vivo in brain mitochondria and is targeted to the inner mitochondrial membrane. Mitochondrial localization of CRMP5 induces mitophagy: CRMP5 overexpression triggers mitochondrial morphology changes, increases lysosomes and autophagosomes, enhances LC3 (lipidated LC3-II form) at mitochondria, and causes autophagosome-lysosome fusion leading to lysosomal degradation of mitochondria. Endogenous CRMP5 expression level inversely correlates with mitochondrial content in developing neurons, and CRMP5 knockdown increases mitochondrial numbers in dendrites.\",\n      \"method\": \"Subcellular fractionation (mitochondrial fraction), immunofluorescence, LC3 lipidation assay, electron microscopy (double membrane vesicles), siRNA knockdown, overexpression in neuronal cultures\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical fractionation, multiple ultrastructural and autophagy markers, loss-of-function and gain-of-function in neurons, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"24324268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A short nuclear isoform of CRMP5, derived from C-terminal processing, localizes to the nucleus of cancer cells (glioblastoma, H69, GL15) via a nuclear localization signal (NLS) with essential residue K391 (identified by mutational analysis). In cancer cells, cytosolic CRMP5 does not interact with tubulin (unlike during normal development), enabling C-terminal truncation and nuclear translocation. The nuclear CRMP5 isoform increases cell proliferation.\",\n      \"method\": \"Mutational analysis of NLS (K391), immunofluorescence in human GBM biopsies and cancer cell lines, co-immunoprecipitation for tubulin interaction, cell proliferation assay\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutational analysis of NLS plus localization and proliferation assay, single lab\",\n      \"pmids\": [\"23298946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Phosphorylation of CRMP5 at Threonine 516 (T516) by GSK-3β is required for neurite outgrowth inhibition. Non-phosphorylatable T516 mutant loses inhibitory function; phosphomimetic T516 mutant retains inhibitory function. T516 phosphorylation is essential for the tubulin-binding property of CRMP5. Other identified phosphorylation sites (T509, T514, S534) are not required for this function.\",\n      \"method\": \"Mutational analysis of phosphorylation sites (T509, T514, T516, S534), non-phosphorylatable and phosphomimetic constructs, PC12 and hippocampal neuron neurite outgrowth assay, GSK-3β kinase assay\",\n      \"journal\": \"The European journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis with defined gain/loss of function, kinase identification (GSK-3β), tubulin-binding assay linked to phosphorylation state\",\n      \"pmids\": [\"25040932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CRMP5 controls GBM cell proliferation and survival through Notch-dependent signaling. Elevated CRMP5 promotes Notch receptor expression and Akt activation. Mechanistically, CRMP5 prevents Itch-dependent lysosomal degradation of Notch receptors, thereby stabilizing Notch signaling in GBM cells and GBM stem cells.\",\n      \"method\": \"Overexpression and knockdown in GBM cell lines and GBM stem cells, GBM xenograft, Western blot for Notch/Akt, Itch-dependent degradation assay, GBM biopsy immunostaining\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with mechanistic link to Notch degradation pathway, single lab, multiple cell types\",\n      \"pmids\": [\"26122847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CRMP-5 interacts with actin in addition to tubulin in growth cones of developing hippocampal neurons. Co-immunoprecipitation shows CRMP-5 binds actin, with higher affinity for actin than microtubules. CRMP-5 colocalizes with actin predominantly in the C-domain and T-zone of growth cones. siRNA knockdown of CRMP-5 suppresses actin expression, growth cone development, and neurite outgrowth; overexpression promotes these processes.\",\n      \"method\": \"Co-immunoprecipitation from hippocampal neurons, immunocytochemistry, siRNA knockdown, overexpression\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP plus functional siRNA/overexpression in neurons, single lab, two orthogonal methods\",\n      \"pmids\": [\"26677106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Sox5 transcription factor directly regulates CRMP5 expression. Sox5 increases CRMP5 promoter activity via a Sox5 consensus binding sequence upstream of the CRMP5 gene; mutation of this site abolishes activation. Sox5 physically binds to the CRMP5 promoter DNA (gel mobility shift and ChIP assays). Sox5 upregulates CRMP5 transcript and protein in N1E115 cells; Sox5-induced neurite outgrowth inhibition requires CRMP5 (CRMP5 knockdown prevents Sox5 effect). Confirmed in mouse primary hippocampal neurons.\",\n      \"method\": \"Luciferase reporter assay, gel mobility shift assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, RT-PCR and immunocytochemistry, primary hippocampal neurons\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ChIP, gel shift, luciferase assay with site mutation, and functional rescue/knockdown in neurons; multiple orthogonal methods in single study\",\n      \"pmids\": [\"28864883\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Spastin (microtubule-severing protein) interacts with CRMP5 both in vitro and in vivo. The binding domain of spastin is residues 270-328 (N-terminal fragment) and of CRMP5 is residues 472-564 (C-terminal fragment). CRMP5 promotes microtubule polymerization which interferes with microtubule-severing function of spastin. Co-transfection of spastin and CRMP5 promotes neurite outgrowth (both dendrites and axons) in hippocampal neurons beyond either alone.\",\n      \"method\": \"Co-immunoprecipitation in vitro and in vivo, domain mapping by truncation mutants, microtubule polymerization assay, siRNA knockdown, overexpression in hippocampal neurons\",\n      \"journal\": \"Developmental neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal domain mapping, in vitro and in vivo binding, functional assay in neurons, single lab\",\n      \"pmids\": [\"30257070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CRMP5 regulates AMPA receptor surface trafficking; specifically, CRMP5 can regulate surface GluA2 levels and GluA2 S880 phosphorylation. In 3xTg-AD mice, elevated hippocampal CRMP5 is associated with social deficits and memory loss; CRMP5 knockdown reverses social deficits and rescues memory impairment, while CRMP5 overexpression accelerates memory loss and decreases social interaction.\",\n      \"method\": \"Lentiviral CRMP5 knockdown/overexpression in mice, behavioral assays (social interaction, memory), Western blot for surface GluA2 and GluA2-S880 phosphorylation\",\n      \"journal\": \"Neuropharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss/gain-of-function with defined behavioral and molecular (AMPAR trafficking) readout, single lab\",\n      \"pmids\": [\"31233825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Missense mutations in DPYSL5 (p.Glu41Lys and p.Gly47Arg), located in the same surface loop of DPYSL5 monomers and oligomers, impair dendritic outgrowth in hippocampal neurons and reduce the interaction of DPYSL5 with MAP2 and βIII-tubulin, preventing formation of the ternary DPYSL5/MAP2/βIII-tubulin complex required for normal dendritic outgrowth regulation. These de novo variants cause brain malformations including corpus callosum agenesis in humans.\",\n      \"method\": \"Functional analysis of missense mutants in primary hippocampal neurons (dendritic outgrowth), co-immunoprecipitation for MAP2 and βIII-tubulin interaction, structural localization of mutations on DPYSL5 oligomer surface\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — disease-variant functional validation with mutant proteins, binding assay, neuronal phenotype, structural localization; multiple orthogonal methods\",\n      \"pmids\": [\"33894126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Elevated hippocampal CRMP5 causes chronic stress-induced cognitive deficits by: (1) disrupting synaptic plasticity through glucocorticoid receptor (GR) phosphorylation-dependent mechanisms, (2) impairing AMPAR (GluA2) trafficking, and (3) triggering cytokine release. shRNA-mediated CRMP5 knockdown rescues CUS-induced cognitive impairment; lentiviral CRMP5 overexpression exacerbates memory decline after subthreshold stress.\",\n      \"method\": \"Chronic unpredictable stress (CUS) mouse model, shRNA and lentiviral CRMP5 manipulation, synaptic plasticity assays, AMPAR trafficking, cytokine measurement, GR phosphorylation Western blot\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain/loss-of-function with multiple molecular readouts (GR, AMPAR, cytokines), single lab\",\n      \"pmids\": [\"36902337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DPYSL5 promotes prostate cancer cell plasticity (neuroendocrine transformation) via EZH2-mediated PRC2 activation. Androgen receptor (AR) suppresses DPYSL5, providing a mechanism for neuroendocrine transformation under androgen deprivation therapy. DPYSL5 overexpression induces neuron-like phenotype, enhances invasion and proliferation, upregulates stemness and NE markers; depletion decreases proliferation, induces G1 arrest, reverses NE phenotype, and upregulates luminal genes. The AR/DPYSL5/EZH2/PRC2 axis was proposed and supported mechanistically.\",\n      \"method\": \"Overexpression and siRNA knockdown in prostate cancer cells, EZH2/PRC2 activity assay, cell cycle analysis, patient tumor cohort (135 samples including 55 t-NEPC) for correlation\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with pathway (EZH2/PRC2) mechanistic follow-up, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"38238517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ATM (ataxia-telangiectasia mutated kinase) phosphorylates CRMP5 as a substrate; ATM depletion leads to reduced CRMP5 phosphorylation (identified by phosphoproteomics), ATM physically associates with CRMP5, and ATM-null conditions result in stabilized microtubules and neurite retraction, implicating CRMP5 in the semaphorin-CRMP5-microtubule signaling axis downstream of ATM.\",\n      \"method\": \"Global proteome and phosphoproteomics of ATM-null mouse cerebellum and human neuroblastoma cells, co-immunoprecipitation (ATM-CRMP5 association), microtubule stabilization assay, neurite retraction measurement\",\n      \"journal\": \"Neurobiology of disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphoproteomics plus co-IP validation plus functional microtubule assay, single study\",\n      \"pmids\": [\"39615799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Patient-derived CV2/CRMP5 autoantibodies bind to CRMP5 antigen on rat dorsal root ganglion (DRG) neurons and superficial laminae of the spinal cord, induce DRG neuron hyperexcitability and mechanical hypersensitivity in vivo. Preventing antibody binding to CRMP5 abolishes these effects. Anti-CD20 B cell depletion in immunized rats ameliorates autoimmunity and neuropathy, establishing a direct mechanism for antibody-mediated nociceptor sensitization.\",\n      \"method\": \"Patient-derived antibody injection into rats, DRG electrophysiology (neuron hyperexcitability), mechanical hypersensitivity behavioral testing, DNA vaccine immunization model, anti-CD20 depletion therapy\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived antibodies replicated in genetic immunization model, electrophysiological mechanistic readout, therapeutic intervention confirms mechanism, multiple orthogonal approaches\",\n      \"pmids\": [\"40775229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Novel DPYSL5 missense variants (including recurrent p.Glu41Lys, novel recurrent p.Glu25Lys, and others) impair dendritic arborization, axonal elongation, and synaptic density in both mouse embryonic primary neuronal cultures and hiPSC-derived human neural stem cells, demonstrating a fundamental role of DPYSL5 in neuronal maturation.\",\n      \"method\": \"Mouse embryonic primary neuronal cultures, hiPSC-derived human neural stem cells, morphological analysis of dendritic arborization, axonal elongation, synaptic density with variant DPYSL5 proteins\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional characterization of disease variants in two independent model systems (mouse and human iPSC-derived), single study\",\n      \"pmids\": [\"41286434\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DPYSL5/CRMP5 is a cytosolic phosphoprotein that inhibits tubulin polymerization and dendrite outgrowth (via a ternary complex with MAP2 and tubulin requiring residues 475–522 and GSK-3β-mediated T516 phosphorylation), antagonizes pro-outgrowth CRMP2 function, localizes to inner mitochondrial membranes to induce mitophagy, mediates Sema3A/neuropilin-1 repulsive signaling in oligodendrocytes and growth cones, interacts with spastin to coordinate microtubule severing and polymerization during neurite growth, is transcriptionally activated by Sox5, is phosphorylated by ATM and TrkB, promotes Notch receptor stabilization and EZH2/PRC2 activation in cancer contexts, and—when targeted by patient-derived autoantibodies—directly sensitizes DRG nociceptors to cause neuropathic pain.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DPYSL5 (CRMP5) is a cytosolic phosphoprotein of the collapsin response mediator family that acts as a negative regulator of neurite and dendrite outgrowth during nervous system development [#0, #6]. Unlike the pro-outgrowth CRMP2, CRMP5 inhibits tubulin polymerization by forming a ternary complex with MAP2 and \\u03b2III-tubulin through its C-terminal residues 475\\u2013522, and its inhibitory effect dominates when both proteins are co-expressed [#6]. This tubulin-binding activity requires GSK-3\\u03b2-mediated phosphorylation at Threonine 516 [#10]. CRMP5 functions as a downstream mediator of Sema3A/neuropilin-1 repulsive guidance signaling, controlling process extension in oligodendrocytes and filopodial dynamics in growth cones [#2, #4], and it coordinates microtubule dynamics with the severing protein spastin during neurite growth [#14]. Its expression is transcriptionally activated by Sox5, which requires CRMP5 to exert outgrowth inhibition [#13]. Beyond the cytoskeleton, CRMP5 localizes to the inner mitochondrial membrane and drives mitophagy, inversely controlling mitochondrial content in developing neurons [#8]. De novo missense variants in DPYSL5 (e.g. p.Glu41Lys, p.Gly47Arg) disrupt the DPYSL5/MAP2/\\u03b2III-tubulin complex and impair dendritic and axonal maturation, causing brain malformations including corpus callosum agenesis [#16, #21]. In cancer, CRMP5 stabilizes Notch receptors by blocking Itch-dependent degradation to promote glioblastoma proliferation [#11] and drives prostate neuroendocrine transformation through an AR/DPYSL5/EZH2/PRC2 axis [#18]. Patient-derived CV2/CRMP5 autoantibodies bind CRMP5 on dorsal root ganglion neurons to sensitize nociceptors and cause neuropathic pain [#20].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Establishing CRMP5 as a distinct CRMP family member that forms hetero-multimeric complexes defined how it might integrate into the CRMP signaling network of the developing brain.\",\n      \"evidence\": \"Yeast two-hybrid and co-IP in COS-7 cells showing interaction with dihydropyrimidinase and CRMP2/3/4 but not CRMP1; parallel identification as a CRMP3/tyrosine-kinase-associated molecule in rat brain\",\n      \"pmids\": [\"10956643\", \"10851247\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of hetero-complex formation not defined\", \"Identity of the associated tyrosine kinases not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placing CRMP5 downstream of Sema3A/neuropilin-1 answered how repulsive guidance cues are transduced to inhibit glial and neuronal process extension.\",\n      \"evidence\": \"Antibody blockade against neuropilin-1, CRMP5, and CRMP2 in primary adult oligodendrocyte cultures with Sema3A-conditioned medium\",\n      \"pmids\": [\"11549731\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between neuropilin-1 and CRMP5 not mapped\", \"Antibody blockade does not reveal intracellular signaling steps\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Loss- and gain-of-function at the growth cone showed CRMP5 directly governs filopodial dynamics and the response to repulsive cues.\",\n      \"evidence\": \"RNAi knockdown, overexpression, cytochalasin D treatment, and Sema3A collapse assays in neuronal cells\",\n      \"pmids\": [\"15509652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of actin-independent filopodial localization unresolved\", \"Link to tubulin regulation not yet made at this stage\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Biochemical reconstitution and domain mapping resolved CRMP5's core mechanism: inhibition of tubulin polymerization via a MAP2/tubulin ternary complex, opposing CRMP2.\",\n      \"evidence\": \"In vitro tubulin polymerization assay, truncation mutagenesis (residues 475-522), siRNA, and hippocampal neuron dendrite assays\",\n      \"pmids\": [\"20702696\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of the switch between inhibitory and permissive states not defined\", \"Structural basis of ternary complex not solved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying GSK-3\\u03b2 phosphorylation of T516 as essential for tubulin binding established the post-translational switch controlling CRMP5 inhibitory activity.\",\n      \"evidence\": \"Phospho-site mutagenesis (non-phosphorylatable vs phosphomimetic), GSK-3\\u03b2 kinase assay, and neurite outgrowth assays in PC12 and hippocampal neurons\",\n      \"pmids\": [\"25040932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals controlling GSK-3\\u03b2 toward CRMP5 not defined\", \"Whether other kinases modulate the same site in vivo unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery of inner-mitochondrial CRMP5 driving mitophagy revealed a cytoskeleton-independent role in controlling neuronal mitochondrial content.\",\n      \"evidence\": \"Subcellular fractionation, LC3 lipidation, electron microscopy, and siRNA/overexpression in neurons\",\n      \"pmids\": [\"24324268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism targeting CRMP5 to the inner membrane unresolved\", \"Relationship between mitophagy role and tubulin role not integrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A knockout mouse linked CRMP5 to dendritic morphology, synaptic plasticity, and BDNF/TrkB signaling, anchoring its developmental function in vivo.\",\n      \"evidence\": \"crmp5-/- mice with Purkinje cell morphology and LTD analysis, plus TrkB co-expression tyrosine phosphorylation in HEK293T\",\n      \"pmids\": [\"21289187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site and functional role of TrkB-induced tyrosine phosphorylation not mapped\", \"Cell-autonomy of synaptic phenotype not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying Sox5 as a direct transcriptional activator showed how CRMP5 outgrowth-inhibitory function is engaged at the gene-regulatory level.\",\n      \"evidence\": \"ChIP, gel shift, luciferase reporter with promoter site mutation, and CRMP5 knockdown rescue in N1E115 and hippocampal neurons\",\n      \"pmids\": [\"28864883\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other transcriptional inputs to DPYSL5 not characterized\", \"Temporal regulation during development not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The spastin interaction explained how CRMP5 coordinates microtubule severing with polymerization, with the combination promoting net neurite growth.\",\n      \"evidence\": \"Reciprocal domain-mapped co-IP, microtubule polymerization assay, and co-transfection in hippocampal neurons\",\n      \"pmids\": [\"30257070\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of the spastin-CRMP5 partnership not tested\", \"Reconciliation with CRMP5's inhibitory role under other conditions unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Functional validation of de novo DPYSL5 missense variants established a causative link to human brain malformations through disruption of the MAP2/tubulin complex.\",\n      \"evidence\": \"Mutant proteins (p.Glu41Lys, p.Gly47Arg) in hippocampal neuron dendrite assays, co-IP for MAP2/\\u03b2III-tubulin, and surface mapping on oligomers\",\n      \"pmids\": [\"33894126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full genotype-phenotype spectrum not delineated\", \"Whether variants alter mitochondrial or other functions not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cancer studies extended CRMP5 mechanism beyond neurons, defining roles in Notch stabilization, EZH2/PRC2-driven neuroendocrine plasticity, and AR-regulated transcription.\",\n      \"evidence\": \"Gain/loss-of-function in glioblastoma and prostate cancer cells with Notch/Itch degradation assays, EZH2/PRC2 activity, cell cycle analysis, and patient cohorts\",\n      \"pmids\": [\"26122847\", \"38238517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction of CRMP5 with Notch/EZH2 machinery not fully resolved\", \"Relationship between cytosolic, nuclear, and cancer functions not unified\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that CV2/CRMP5 autoantibodies directly sensitize DRG nociceptors established an antibody-mediated mechanism for paraneoplastic neuropathic pain.\",\n      \"evidence\": \"Patient-derived antibody injection, DRG electrophysiology, mechanical hypersensitivity, DNA vaccine immunization, and anti-CD20 B cell depletion in rats\",\n      \"pmids\": [\"40775229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular consequence of autoantibody binding to a cytosolic antigen not mechanistically explained\", \"How surface accessibility of CRMP5 on DRG neurons arises unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CRMP5's distinct functional pools \\u2014 cytosolic tubulin inhibition, mitochondrial mitophagy, nuclear/cancer signaling, and autoantibody target \\u2014 are coordinated within a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating tubulin, mitochondrial, and nuclear roles\", \"Switch governing subcellular partitioning unknown\", \"Phosphorylation code linking GSK-3\\u03b2, TrkB, and ATM inputs not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 10, 14, 12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [6, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 9]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [8, 3]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 6, 12]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 4, 6, 16]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 11]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [7, 15]}\n    ],\n    \"complexes\": [\"DPYSL5/MAP2/\\u03b2III-tubulin ternary complex\"],\n    \"partners\": [\"CRMP2\", \"CRMP3\", \"MAP2\", \"TUBB3\", \"SPAST\", \"TRKB\", \"ATM\", \"SOX5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":9,"faith_total":9,"faith_pct":100.0}}