{"gene":"RELN","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2000,"finding":"RELN encodes a large (388 kDa) secreted protein that acts on migrating cortical neurons by binding to VLDLR, ApoER2, alpha3beta1 integrin, and protocadherins; loss-of-function mutations cause lissencephaly with cerebellar hypoplasia (LCH) in humans, paralleling the reeler mouse phenotype.","method":"Human genetic mutation analysis (splice-site mutations), protein expression analysis, phenotypic characterization","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — human loss-of-function mutations with defined molecular and cellular phenotype, replicated across independent families and consistent with mouse model","pmids":["10973257"],"is_preprint":false},{"year":1997,"finding":"The C-terminal region of Reelin is essential for its secretion; the Orleans reeler mutation produces a truncated Reelin protein that is retained intracellularly and not secreted, demonstrating that the Orleans phenotype results from defective secretion rather than secretion of an inactive protein.","method":"Immunohistochemistry with N-terminal and C-terminal antibodies, vital staining of living cells, protein detection in Orleans vs. wild-type embryos","journal":"Brain research. Molecular brain research","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal antibody approaches demonstrating C-terminal dependence of secretion, functionally validated in vivo","pmids":["9406921"],"is_preprint":false},{"year":2001,"finding":"Reelin is secreted from Cajal-Retzius cells via an axonal pathway involving bulk transport in smooth endoplasmic reticulum cisterns along axons, forming 'axonal reelin reservoirs' that release Reelin into the cortical marginal zone.","method":"Light and electron microscopy immunohistochemistry comparing normal and Reln(Orl) mutant mice","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 — ultrastructural evidence in vivo with mutant comparison, single lab study","pmids":["11745613"],"is_preprint":false},{"year":2003,"finding":"Reelin is required for proper lateral migration and positioning of nigral dopaminergic neurons; in reeler mutant mice lacking Reelin, dopaminergic neurons fail to migrate laterally and cluster near the ventral tegmental area, and Reelin can act at remote sites via transaxonal delivery from striatal neurons.","method":"Comparison of normal vs. reeler mutant mice using CR-50 immunolabeling and anterograde axonal tracing","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined cellular phenotype, single lab","pmids":["12724835"],"is_preprint":false},{"year":2017,"finding":"The C-terminal region (CTR) domain of RELN confers receptor-binding specificity: CTR truncation significantly decreases RELN binding to VLDLR but not to APOER2, and genetic epistasis shows that CTR-truncation disrupts the VLDLR signaling pathway while leaving APOER2 signaling intact.","method":"Chemically induced splice-site mutant mice, genetic epistasis (double/triple homozygotes with Vldlr-null and Apoer2-null), RELN-binding assay in vitro","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding assay plus genetic epistasis with multiple mutant combinations, orthogonal approaches in one study","pmids":["28123028"],"is_preprint":false},{"year":2017,"finding":"The de novo ASD mutation RELN R2290C (and other mutations in arginine-amino acid-arginine domains) reduces Reelin protein secretion; RELN R2290C heterozygous neurospheres show up-regulation of Protein Disulfide Isomerase A1 (an ER chaperone), suggesting pathologic ER stress contributes to ASD risk.","method":"Functional characterization of RELN R2290C in neurospheres, Western blot, comparison with heterozygous Reln mouse mutant with defective secretion","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — functional secretion assay in patient-derived neurospheres replicated in mouse model, single lab","pmids":["28419454"],"is_preprint":false},{"year":2018,"finding":"Rare compound heterozygous missense RELN variants in an ASD patient lead to diminished Reelin secretion and impaired Reelin-DAB1 signal transduction in iPSC-derived neural progenitor cells; mTORC1 pathway overactivation acts as a second hit that further downregulates the Reelin-DAB1 cascade, and rapamycin inhibition of mTORC1 attenuates this signaling impairment.","method":"iPSC-derived neural progenitor cells from patient, functional secretion assay, phospho-DAB1 signaling assay, rapamycin treatment","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 — patient-derived iPSC model with functional secretion and signaling assays, single lab","pmids":["29969175"],"is_preprint":false},{"year":2016,"finding":"RELN and its downstream effector DAB1 are silenced in glioblastoma via promoter hypermethylation; RELN signaling reduces glioblastoma cell proliferation through DAB1 tyrosine phosphorylation-dependent reduction in E2F targets and ERK1/2 dephosphorylation, and regulates migration in both DAB1-dependent and -independent fashions depending on substrate.","method":"Bisulfite sequencing, 5'-Azacytidine/trichostatin A treatment, DAB1-5F phosphorylation mutant, proteomic analysis, proliferation and migration assays","journal":"Brain pathology","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays including phosphorylation-deficient mutant establishing DAB1 dependency, single lab","pmids":["29222813"],"is_preprint":false},{"year":2016,"finding":"The histone demethylase KDM5B (Jarid1b) represses Reln transcription in adult subventricular zone neural stem cells by occupying the proximal Reln promoter and reducing H3K4me3; KDM5B depletion increases extracellular Reelin, enhances DAB1 phosphorylation, and promotes neural stem cell migration in a Reelin-dependent manner.","method":"shRNA knockdown, chromatin immunoprecipitation (ChIP), H3K4me3 profiling, CR-50 antibody sequestration, DAB1 phosphorylation assay, migration assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP demonstrating KDM5B binding at Reln promoter, H3K4me3 changes, functional rescue with blocking antibody, multiple orthogonal methods","pmids":["26739753"],"is_preprint":false},{"year":2020,"finding":"EGR3 is a transcriptional activator of RELN: ChIP and luciferase reporter assays demonstrate EGR3 directly binds the RELN promoter and activates its expression; EGR3 overexpression reduces neurite outgrowth, which is partially reversed by RELN knockdown, placing EGR3 upstream of RELN in a neurite outgrowth pathway.","method":"ChIP assay, luciferase reporter assay, siRNA knockdown, neurite outgrowth assay in SH-SY5Y cells","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding demonstrated by ChIP and reporter assay, epistasis by double knockdown, single lab","pmids":["33113163"],"is_preprint":false},{"year":2008,"finding":"Pafah1b2 (Alpha2 subunit of Lis1 complex) mutations suppress the hydrocephalus phenotype of compound Pafah1b1;Reln and Pafah1b1;Dab1 mutant mice, while Pafah1b3 exacerbates layering defects, demonstrating that the two Pafah1b Alpha subunits interact differently with the Reelin signaling pathway.","method":"Genetic epistasis with triple mouse mutants","journal":"Neuroscience letters","confidence":"Medium","confidence_rationale":"Tier 2 — clean genetic epistasis in triple mutant mice, single lab","pmids":["18514414"],"is_preprint":false},{"year":2021,"finding":"ADAMTS-3 cleaves Reelin at the N-terminal site to inactivate it; knockdown of ADAMTS-3 by shRNA suppresses Reelin cleavage in conditioned medium and reduces DAB1 expression in primary cultured cortical neurons, indicating enhanced Reelin signaling, suggesting ADAMTS-3 inhibition as a therapeutic approach.","method":"shRNA knockdown of ADAMTS-3, Western blot of conditioned medium for Reelin cleavage products, DAB1 expression measurement in primary cortical neuron cultures","journal":"Neurochemistry international","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic demonstration of cleavage and downstream DAB1 changes in primary neurons, single lab","pmids":["33388358"],"is_preprint":false},{"year":2018,"finding":"Single-cell trajectory analysis of CRISPR-engineered human iPSC-derived dopaminergic neurons carrying a rare RELN deletion shows impaired Reelin signaling and decreased expression of cell movement genes, resulting in a wandering (non-directional) migration pattern rather than the directional migration seen in control neurons.","method":"CRISPR genome editing, iPSC differentiation to dopaminergic neurons, single-cell trajectory analysis, gene expression profiling","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 — isogenic comparison in human neurons with single-cell functional readout, replicated in patient-derived neurons","pmids":["30022058"],"is_preprint":false},{"year":1994,"finding":"The murine reeler (rl) gene was mapped to the proximal region of chromosome 5 between Hgf and D5Mit66, flanked by D5Nam1 and D5Mit72 markers, providing the genetic locus for the Reln gene.","method":"Interspecific crosses between BALB/c and Mus spretus, high-resolution linkage mapping","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mapping in interspecific cross, foundational locus identification","pmids":["7851897"],"is_preprint":false}],"current_model":"RELN encodes a large secreted glycoprotein (Reelin) whose C-terminal region is required for secretion and confers binding specificity to VLDLR (but not APOER2); secreted Reelin signals through VLDLR and APOER2 receptors to phosphorylate the adaptor DAB1, regulating neuronal migration and positioning during brain development, as well as synaptic plasticity postnatally, with transcriptional control exerted by EGR3 and epigenetic repression by KDM5B at the RELN promoter, and proteolytic inactivation by ADAMTS-3."},"narrative":{"teleology":[{"year":1994,"claim":"Genetic mapping of the reeler locus to mouse chromosome 5 established the chromosomal position of Reln, enabling its subsequent molecular cloning.","evidence":"Interspecific crosses and high-resolution linkage mapping in BALB/c × Mus spretus","pmids":["7851897"],"confidence":"Medium","gaps":["Gene not yet cloned or sequenced","No functional characterization of the encoded protein"]},{"year":1997,"claim":"Demonstrating that the C-terminal region is required for Reelin secretion resolved whether the Orleans reeler phenotype arises from failure of secretion versus secretion of an inactive protein, establishing that secretion itself is the critical step.","evidence":"N-terminal and C-terminal antibody immunohistochemistry comparing wild-type and Orleans mutant mouse embryos","pmids":["9406921"],"confidence":"High","gaps":["Molecular mechanism by which the C-terminal region enables secretion not defined","Receptor interactions of secreted Reelin not yet mapped"]},{"year":2000,"claim":"Identification of homozygous RELN mutations causing lissencephaly with cerebellar hypoplasia in humans established RELN as a disease gene and confirmed its conserved role in cortical lamination across species.","evidence":"Human genetic analysis identifying splice-site mutations in consanguineous families, phenotypic characterization paralleling reeler mouse","pmids":["10973257"],"confidence":"High","gaps":["Downstream signaling pathway in human neurons not yet dissected","Contribution of individual Reelin receptors to disease phenotype unknown"]},{"year":2001,"claim":"Ultrastructural localization of Reelin secretion via axonal smooth ER cisterns from Cajal-Retzius cells revealed a non-canonical secretory route and explained how Reelin reaches the marginal zone.","evidence":"Electron microscopy immunohistochemistry comparing normal and Reln(Orl) mutant mice","pmids":["11745613"],"confidence":"Medium","gaps":["Mechanism of ER-mediated axonal transport of Reelin not characterized","Whether this secretory route operates outside Cajal-Retzius cells unknown"]},{"year":2003,"claim":"Showing that Reelin controls lateral migration of midbrain dopaminergic neurons extended its role beyond cortical lamination to subcortical neuronal positioning.","evidence":"CR-50 immunolabeling and anterograde tracing in reeler mutant versus wild-type mice","pmids":["12724835"],"confidence":"Medium","gaps":["Receptor(s) mediating dopaminergic neuron migration not identified","Whether DAB1 phosphorylation operates in this context not tested"]},{"year":2008,"claim":"Genetic epistasis between Pafah1b subunits and the Reelin-DAB1 pathway demonstrated that LIS1 complex components differentially modulate Reelin signaling output, connecting Reelin to the broader lissencephaly gene network.","evidence":"Triple-mutant mouse genetic epistasis (Pafah1b1/Pafah1b2/Reln and Pafah1b1/Pafah1b3/Dab1 combinations)","pmids":["18514414"],"confidence":"Medium","gaps":["Biochemical mechanism linking Pafah1b subunits to Reelin-DAB1 cascade not defined","Whether interactions are direct or via shared cytoskeletal targets unknown"]},{"year":2016,"claim":"Two studies established that Reelin transcription and signaling are regulated at the chromatin level: KDM5B represses RELN by removing H3K4me3 at its promoter in neural stem cells, while promoter hypermethylation silences RELN and DAB1 in glioblastoma, with functional consequences for proliferation and migration.","evidence":"ChIP for KDM5B and H3K4me3 at Reln promoter with shRNA rescue in neural stem cells; bisulfite sequencing and 5-Aza/TSA treatment plus DAB1 phosphorylation-deficient mutant in glioblastoma cells","pmids":["26739753","29222813"],"confidence":"High","gaps":["Whether KDM5B regulation occurs in cortical neurons in vivo not tested","Mechanism linking Reelin-DAB1 to E2F target repression incompletely characterized"]},{"year":2017,"claim":"The CTR domain was shown to confer receptor selectivity — its truncation reduces VLDLR binding while sparing APOER2 binding — resolving how a single ligand differentially engages two co-receptors.","evidence":"Chemically induced CTR-truncation mutant mice combined with Vldlr-null and Apoer2-null genetic epistasis, plus in vitro binding assays","pmids":["28123028"],"confidence":"High","gaps":["Structural basis of CTR-VLDLR interaction not resolved","Whether CTR truncation affects other reported receptors (integrins, protocadherins) not tested"]},{"year":2017,"claim":"Functional characterization of the ASD-associated RELN R2290C variant revealed that arginine-residue mutations reduce Reelin secretion and induce ER stress, providing a biochemical mechanism linking RELN variants to neurodevelopmental disease.","evidence":"Secretion assays and PDI-A1 upregulation in patient neurospheres and heterozygous Reln mouse model","pmids":["28419454"],"confidence":"Medium","gaps":["Whether ER stress is a universal feature of RELN missense variants not established","In vivo neuronal migration phenotype of R2290C not shown"]},{"year":2018,"claim":"Patient-derived and CRISPR-engineered iPSC models demonstrated that RELN variants impair DAB1 signal transduction and directional neuronal migration in human dopaminergic neurons, with mTORC1 overactivation acting as a convergent hit that is partially reversible by rapamycin.","evidence":"iPSC-derived neural progenitors from ASD patient with compound heterozygous RELN variants (phospho-DAB1 and rapamycin rescue); CRISPR-engineered RELN deletion in iPSC-derived dopaminergic neurons with single-cell trajectory analysis","pmids":["29969175","30022058"],"confidence":"Medium","gaps":["Whether rapamycin rescues migration phenotype in vivo not tested","Molecular link between Reelin-DAB1 and mTORC1 not defined"]},{"year":2020,"claim":"Identification of EGR3 as a direct transcriptional activator of RELN placed an upstream transcription factor in the Reelin regulatory hierarchy and linked it to neurite outgrowth control.","evidence":"ChIP and luciferase reporter assay for EGR3 binding at RELN promoter; siRNA epistasis in SH-SY5Y cells","pmids":["33113163"],"confidence":"Medium","gaps":["Whether EGR3 regulation of RELN operates in primary cortical neurons or in vivo not shown","Other transcriptional activators of RELN not systematically identified"]},{"year":2021,"claim":"ADAMTS-3 was identified as a physiological N-terminal protease that inactivates Reelin, establishing a specific extracellular mechanism for terminating Reelin signaling.","evidence":"shRNA knockdown of ADAMTS-3 with Western blot detection of Reelin cleavage products and DAB1 expression changes in primary cortical neurons","pmids":["33388358"],"confidence":"Medium","gaps":["In vivo validation of ADAMTS-3 as the principal Reelin protease lacking","Whether other ADAMTS family members contribute redundantly not assessed"]},{"year":null,"claim":"The structural basis for Reelin's selective engagement of VLDLR versus APOER2 remains unresolved, and how Reelin-DAB1 signaling intersects mechanistically with the mTORC1 pathway and LIS1 complex is incompletely defined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structural model of Reelin-receptor complexes","Biochemical mechanism connecting DAB1 phosphorylation to mTORC1 unknown","In vivo contribution of ADAMTS-3 versus other proteases to Reelin inactivation not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,4,7]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2,11]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,5]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,6,7,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,3,12]}],"complexes":[],"partners":["VLDLR","APOER2","DAB1","KDM5B","EGR3","ADAMTS3","PAFAH1B1"],"other_free_text":[]},"mechanistic_narrative":"RELN encodes Reelin, a large secreted glycoprotein that functions as a master regulator of neuronal migration and cortical lamination during brain development and continues to modulate synaptic signaling and cell migration in the postnatal brain. Secreted Reelin signals through the lipoprotein receptors VLDLR and APOER2 to induce tyrosine phosphorylation of the intracellular adaptor DAB1, with the C-terminal region (CTR) of Reelin being essential both for secretion and for selective binding to VLDLR but not APOER2 [PMID:9406921, PMID:28123028]. Reelin transcription is positively regulated by EGR3 and repressed by the histone demethylase KDM5B through H3K4me3 removal at the RELN promoter, while extracellular Reelin is proteolytically inactivated by ADAMTS-3 cleavage at its N-terminal site [PMID:26739753, PMID:33113163, PMID:33388358]. Loss-of-function mutations in RELN cause autosomal recessive lissencephaly with cerebellar hypoplasia in humans, and rare missense or deletion variants that impair Reelin secretion or DAB1 signaling are associated with autism spectrum disorder [PMID:10973257, PMID:28419454, PMID:29969175]."},"prefetch_data":{"uniprot":{"accession":"P78509","full_name":"Reelin","aliases":[],"length_aa":3460,"mass_kda":388.4,"function":"Extracellular matrix serine protease secreted by pioneer neurons that plays a role in layering of neurons in the cerebral cortex and cerebellum by coordinating cell positioning during neurodevelopment. Regulates microtubule function in neurons and neuronal migration. Binding to the extracellular domains of lipoprotein receptors VLDLR and LRP8/APOER2 induces tyrosine phosphorylation of DAB1 and modulation of TAU phosphorylation. Affects migration of sympathetic preganglionic neurons in the spinal cord, where it seems to act as a barrier to neuronal migration. Enzymatic activity is important for the modulation of cell adhesion","subcellular_location":"Secreted, extracellular space, extracellular matrix","url":"https://www.uniprot.org/uniprotkb/P78509/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RELN","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RELN","total_profiled":1310},"omim":[{"mim_id":"616436","title":"EPILEPSY, FAMILIAL TEMPORAL LOBE, 7; ETL7","url":"https://www.omim.org/entry/616436"},{"mim_id":"613065","title":"LEUKEMIA, ACUTE LYMPHOBLASTIC; ALL","url":"https://www.omim.org/entry/613065"},{"mim_id":"608626","title":"STE20-RELATED KINASE ADAPTOR ALPHA; STRADA","url":"https://www.omim.org/entry/608626"},{"mim_id":"607432","title":"LISSENCEPHALY 1; LIS1","url":"https://www.omim.org/entry/607432"},{"mim_id":"607414","title":"FEZ FAMILY ZINC FINGER PROTEIN 2; FEZF2","url":"https://www.omim.org/entry/607414"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":26.2},{"tissue":"liver","ntpm":12.6}],"url":"https://www.proteinatlas.org/search/RELN"},"hgnc":{"alias_symbol":["RL","PRO1598"],"prev_symbol":[]},"alphafold":{"accession":"P78509","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P78509","model_url":"","pae_url":"","plddt_mean":null},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RELN","jax_strain_url":"https://www.jax.org/strain/search?query=RELN"},"sequence":{"accession":"P78509","fasta_url":"https://rest.uniprot.org/uniprotkb/P78509.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P78509/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P78509"}},"corpus_meta":[{"pmid":"10973257","id":"PMC_10973257","title":"Autosomal recessive lissencephaly with cerebellar hypoplasia is associated with human RELN mutations.","date":"2000","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10973257","citation_count":636,"is_preprint":false},{"pmid":"15717292","id":"PMC_15717292","title":"Hypermethylation of the reelin (RELN) promoter in the brain of schizophrenic patients: a preliminary report.","date":"2005","source":"American journal of medical genetics. 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demonstrating that the Orleans phenotype results from defective secretion rather than secretion of an inactive protein.\",\n      \"method\": \"Immunohistochemistry with N-terminal and C-terminal antibodies, vital staining of living cells, protein detection in Orleans vs. wild-type embryos\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal antibody approaches demonstrating C-terminal dependence of secretion, functionally validated in vivo\",\n      \"pmids\": [\"9406921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Reelin is secreted from Cajal-Retzius cells via an axonal pathway involving bulk transport in smooth endoplasmic reticulum cisterns along axons, forming 'axonal reelin reservoirs' that release Reelin into the cortical marginal zone.\",\n      \"method\": \"Light and electron microscopy immunohistochemistry comparing normal and Reln(Orl) mutant mice\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ultrastructural evidence in vivo with mutant comparison, single lab study\",\n      \"pmids\": [\"11745613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Reelin is required for proper lateral migration and positioning of nigral dopaminergic neurons; in reeler mutant mice lacking Reelin, dopaminergic neurons fail to migrate laterally and cluster near the ventral tegmental area, and Reelin can act at remote sites via transaxonal delivery from striatal neurons.\",\n      \"method\": \"Comparison of normal vs. reeler mutant mice using CR-50 immunolabeling and anterograde axonal tracing\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined cellular phenotype, single lab\",\n      \"pmids\": [\"12724835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The C-terminal region (CTR) domain of RELN confers receptor-binding specificity: CTR truncation significantly decreases RELN binding to VLDLR but not to APOER2, and genetic epistasis shows that CTR-truncation disrupts the VLDLR signaling pathway while leaving APOER2 signaling intact.\",\n      \"method\": \"Chemically induced splice-site mutant mice, genetic epistasis (double/triple homozygotes with Vldlr-null and Apoer2-null), RELN-binding assay in vitro\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assay plus genetic epistasis with multiple mutant combinations, orthogonal approaches in one study\",\n      \"pmids\": [\"28123028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The de novo ASD mutation RELN R2290C (and other mutations in arginine-amino acid-arginine domains) reduces Reelin protein secretion; RELN R2290C heterozygous neurospheres show up-regulation of Protein Disulfide Isomerase A1 (an ER chaperone), suggesting pathologic ER stress contributes to ASD risk.\",\n      \"method\": \"Functional characterization of RELN R2290C in neurospheres, Western blot, comparison with heterozygous Reln mouse mutant with defective secretion\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional secretion assay in patient-derived neurospheres replicated in mouse model, single lab\",\n      \"pmids\": [\"28419454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Rare compound heterozygous missense RELN variants in an ASD patient lead to diminished Reelin secretion and impaired Reelin-DAB1 signal transduction in iPSC-derived neural progenitor cells; mTORC1 pathway overactivation acts as a second hit that further downregulates the Reelin-DAB1 cascade, and rapamycin inhibition of mTORC1 attenuates this signaling impairment.\",\n      \"method\": \"iPSC-derived neural progenitor cells from patient, functional secretion assay, phospho-DAB1 signaling assay, rapamycin treatment\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived iPSC model with functional secretion and signaling assays, single lab\",\n      \"pmids\": [\"29969175\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RELN and its downstream effector DAB1 are silenced in glioblastoma via promoter hypermethylation; RELN signaling reduces glioblastoma cell proliferation through DAB1 tyrosine phosphorylation-dependent reduction in E2F targets and ERK1/2 dephosphorylation, and regulates migration in both DAB1-dependent and -independent fashions depending on substrate.\",\n      \"method\": \"Bisulfite sequencing, 5'-Azacytidine/trichostatin A treatment, DAB1-5F phosphorylation mutant, proteomic analysis, proliferation and migration assays\",\n      \"journal\": \"Brain pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays including phosphorylation-deficient mutant establishing DAB1 dependency, single lab\",\n      \"pmids\": [\"29222813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The histone demethylase KDM5B (Jarid1b) represses Reln transcription in adult subventricular zone neural stem cells by occupying the proximal Reln promoter and reducing H3K4me3; KDM5B depletion increases extracellular Reelin, enhances DAB1 phosphorylation, and promotes neural stem cell migration in a Reelin-dependent manner.\",\n      \"method\": \"shRNA knockdown, chromatin immunoprecipitation (ChIP), H3K4me3 profiling, CR-50 antibody sequestration, DAB1 phosphorylation assay, migration assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP demonstrating KDM5B binding at Reln promoter, H3K4me3 changes, functional rescue with blocking antibody, multiple orthogonal methods\",\n      \"pmids\": [\"26739753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EGR3 is a transcriptional activator of RELN: ChIP and luciferase reporter assays demonstrate EGR3 directly binds the RELN promoter and activates its expression; EGR3 overexpression reduces neurite outgrowth, which is partially reversed by RELN knockdown, placing EGR3 upstream of RELN in a neurite outgrowth pathway.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, siRNA knockdown, neurite outgrowth assay in SH-SY5Y cells\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding demonstrated by ChIP and reporter assay, epistasis by double knockdown, single lab\",\n      \"pmids\": [\"33113163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Pafah1b2 (Alpha2 subunit of Lis1 complex) mutations suppress the hydrocephalus phenotype of compound Pafah1b1;Reln and Pafah1b1;Dab1 mutant mice, while Pafah1b3 exacerbates layering defects, demonstrating that the two Pafah1b Alpha subunits interact differently with the Reelin signaling pathway.\",\n      \"method\": \"Genetic epistasis with triple mouse mutants\",\n      \"journal\": \"Neuroscience letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis in triple mutant mice, single lab\",\n      \"pmids\": [\"18514414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADAMTS-3 cleaves Reelin at the N-terminal site to inactivate it; knockdown of ADAMTS-3 by shRNA suppresses Reelin cleavage in conditioned medium and reduces DAB1 expression in primary cultured cortical neurons, indicating enhanced Reelin signaling, suggesting ADAMTS-3 inhibition as a therapeutic approach.\",\n      \"method\": \"shRNA knockdown of ADAMTS-3, Western blot of conditioned medium for Reelin cleavage products, DAB1 expression measurement in primary cortical neuron cultures\",\n      \"journal\": \"Neurochemistry international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic demonstration of cleavage and downstream DAB1 changes in primary neurons, single lab\",\n      \"pmids\": [\"33388358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Single-cell trajectory analysis of CRISPR-engineered human iPSC-derived dopaminergic neurons carrying a rare RELN deletion shows impaired Reelin signaling and decreased expression of cell movement genes, resulting in a wandering (non-directional) migration pattern rather than the directional migration seen in control neurons.\",\n      \"method\": \"CRISPR genome editing, iPSC differentiation to dopaminergic neurons, single-cell trajectory analysis, gene expression profiling\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — isogenic comparison in human neurons with single-cell functional readout, replicated in patient-derived neurons\",\n      \"pmids\": [\"30022058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The murine reeler (rl) gene was mapped to the proximal region of chromosome 5 between Hgf and D5Mit66, flanked by D5Nam1 and D5Mit72 markers, providing the genetic locus for the Reln gene.\",\n      \"method\": \"Interspecific crosses between BALB/c and Mus spretus, high-resolution linkage mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mapping in interspecific cross, foundational locus identification\",\n      \"pmids\": [\"7851897\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RELN encodes a large secreted glycoprotein (Reelin) whose C-terminal region is required for secretion and confers binding specificity to VLDLR (but not APOER2); secreted Reelin signals through VLDLR and APOER2 receptors to phosphorylate the adaptor DAB1, regulating neuronal migration and positioning during brain development, as well as synaptic plasticity postnatally, with transcriptional control exerted by EGR3 and epigenetic repression by KDM5B at the RELN promoter, and proteolytic inactivation by ADAMTS-3.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RELN encodes Reelin, a large secreted glycoprotein that functions as a master regulator of neuronal migration and cortical lamination during brain development and continues to modulate synaptic signaling and cell migration in the postnatal brain. Secreted Reelin signals through the lipoprotein receptors VLDLR and APOER2 to induce tyrosine phosphorylation of the intracellular adaptor DAB1, with the C-terminal region (CTR) of Reelin being essential both for secretion and for selective binding to VLDLR but not APOER2 [PMID:9406921, PMID:28123028]. Reelin transcription is positively regulated by EGR3 and repressed by the histone demethylase KDM5B through H3K4me3 removal at the RELN promoter, while extracellular Reelin is proteolytically inactivated by ADAMTS-3 cleavage at its N-terminal site [PMID:26739753, PMID:33113163, PMID:33388358]. Loss-of-function mutations in RELN cause autosomal recessive lissencephaly with cerebellar hypoplasia in humans, and rare missense or deletion variants that impair Reelin secretion or DAB1 signaling are associated with autism spectrum disorder [PMID:10973257, PMID:28419454, PMID:29969175].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Genetic mapping of the reeler locus to mouse chromosome 5 established the chromosomal position of Reln, enabling its subsequent molecular cloning.\",\n      \"evidence\": \"Interspecific crosses and high-resolution linkage mapping in BALB/c × Mus spretus\",\n      \"pmids\": [\"7851897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Gene not yet cloned or sequenced\", \"No functional characterization of the encoded protein\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Demonstrating that the C-terminal region is required for Reelin secretion resolved whether the Orleans reeler phenotype arises from failure of secretion versus secretion of an inactive protein, establishing that secretion itself is the critical step.\",\n      \"evidence\": \"N-terminal and C-terminal antibody immunohistochemistry comparing wild-type and Orleans mutant mouse embryos\",\n      \"pmids\": [\"9406921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which the C-terminal region enables secretion not defined\", \"Receptor interactions of secreted Reelin not yet mapped\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of homozygous RELN mutations causing lissencephaly with cerebellar hypoplasia in humans established RELN as a disease gene and confirmed its conserved role in cortical lamination across species.\",\n      \"evidence\": \"Human genetic analysis identifying splice-site mutations in consanguineous families, phenotypic characterization paralleling reeler mouse\",\n      \"pmids\": [\"10973257\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling pathway in human neurons not yet dissected\", \"Contribution of individual Reelin receptors to disease phenotype unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Ultrastructural localization of Reelin secretion via axonal smooth ER cisterns from Cajal-Retzius cells revealed a non-canonical secretory route and explained how Reelin reaches the marginal zone.\",\n      \"evidence\": \"Electron microscopy immunohistochemistry comparing normal and Reln(Orl) mutant mice\",\n      \"pmids\": [\"11745613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ER-mediated axonal transport of Reelin not characterized\", \"Whether this secretory route operates outside Cajal-Retzius cells unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showing that Reelin controls lateral migration of midbrain dopaminergic neurons extended its role beyond cortical lamination to subcortical neuronal positioning.\",\n      \"evidence\": \"CR-50 immunolabeling and anterograde tracing in reeler mutant versus wild-type mice\",\n      \"pmids\": [\"12724835\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor(s) mediating dopaminergic neuron migration not identified\", \"Whether DAB1 phosphorylation operates in this context not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic epistasis between Pafah1b subunits and the Reelin-DAB1 pathway demonstrated that LIS1 complex components differentially modulate Reelin signaling output, connecting Reelin to the broader lissencephaly gene network.\",\n      \"evidence\": \"Triple-mutant mouse genetic epistasis (Pafah1b1/Pafah1b2/Reln and Pafah1b1/Pafah1b3/Dab1 combinations)\",\n      \"pmids\": [\"18514414\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical mechanism linking Pafah1b subunits to Reelin-DAB1 cascade not defined\", \"Whether interactions are direct or via shared cytoskeletal targets unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two studies established that Reelin transcription and signaling are regulated at the chromatin level: KDM5B represses RELN by removing H3K4me3 at its promoter in neural stem cells, while promoter hypermethylation silences RELN and DAB1 in glioblastoma, with functional consequences for proliferation and migration.\",\n      \"evidence\": \"ChIP for KDM5B and H3K4me3 at Reln promoter with shRNA rescue in neural stem cells; bisulfite sequencing and 5-Aza/TSA treatment plus DAB1 phosphorylation-deficient mutant in glioblastoma cells\",\n      \"pmids\": [\"26739753\", \"29222813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KDM5B regulation occurs in cortical neurons in vivo not tested\", \"Mechanism linking Reelin-DAB1 to E2F target repression incompletely characterized\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The CTR domain was shown to confer receptor selectivity — its truncation reduces VLDLR binding while sparing APOER2 binding — resolving how a single ligand differentially engages two co-receptors.\",\n      \"evidence\": \"Chemically induced CTR-truncation mutant mice combined with Vldlr-null and Apoer2-null genetic epistasis, plus in vitro binding assays\",\n      \"pmids\": [\"28123028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CTR-VLDLR interaction not resolved\", \"Whether CTR truncation affects other reported receptors (integrins, protocadherins) not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Functional characterization of the ASD-associated RELN R2290C variant revealed that arginine-residue mutations reduce Reelin secretion and induce ER stress, providing a biochemical mechanism linking RELN variants to neurodevelopmental disease.\",\n      \"evidence\": \"Secretion assays and PDI-A1 upregulation in patient neurospheres and heterozygous Reln mouse model\",\n      \"pmids\": [\"28419454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ER stress is a universal feature of RELN missense variants not established\", \"In vivo neuronal migration phenotype of R2290C not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Patient-derived and CRISPR-engineered iPSC models demonstrated that RELN variants impair DAB1 signal transduction and directional neuronal migration in human dopaminergic neurons, with mTORC1 overactivation acting as a convergent hit that is partially reversible by rapamycin.\",\n      \"evidence\": \"iPSC-derived neural progenitors from ASD patient with compound heterozygous RELN variants (phospho-DAB1 and rapamycin rescue); CRISPR-engineered RELN deletion in iPSC-derived dopaminergic neurons with single-cell trajectory analysis\",\n      \"pmids\": [\"29969175\", \"30022058\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether rapamycin rescues migration phenotype in vivo not tested\", \"Molecular link between Reelin-DAB1 and mTORC1 not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of EGR3 as a direct transcriptional activator of RELN placed an upstream transcription factor in the Reelin regulatory hierarchy and linked it to neurite outgrowth control.\",\n      \"evidence\": \"ChIP and luciferase reporter assay for EGR3 binding at RELN promoter; siRNA epistasis in SH-SY5Y cells\",\n      \"pmids\": [\"33113163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether EGR3 regulation of RELN operates in primary cortical neurons or in vivo not shown\", \"Other transcriptional activators of RELN not systematically identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"ADAMTS-3 was identified as a physiological N-terminal protease that inactivates Reelin, establishing a specific extracellular mechanism for terminating Reelin signaling.\",\n      \"evidence\": \"shRNA knockdown of ADAMTS-3 with Western blot detection of Reelin cleavage products and DAB1 expression changes in primary cortical neurons\",\n      \"pmids\": [\"33388358\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo validation of ADAMTS-3 as the principal Reelin protease lacking\", \"Whether other ADAMTS family members contribute redundantly not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for Reelin's selective engagement of VLDLR versus APOER2 remains unresolved, and how Reelin-DAB1 signaling intersects mechanistically with the mTORC1 pathway and LIS1 complex is incompletely defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structural model of Reelin-receptor complexes\", \"Biochemical mechanism connecting DAB1 phosphorylation to mTORC1 unknown\", \"In vivo contribution of ADAMTS-3 versus other proteases to Reelin inactivation not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 2, 11]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 6, 7, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 3, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"VLDLR\",\n      \"APOER2\",\n      \"DAB1\",\n      \"KDM5B\",\n      \"EGR3\",\n      \"ADAMTS3\",\n      \"PAFAH1B1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}