{"gene":"SLIT1","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":1998,"finding":"Mammalian SLIT1 (and SLIT2, SLIT3) were cloned as vertebrate homologs of Drosophila slit, encoding secreted proteins with leucine-rich repeat (LRR) and EGF-like domains. Northern blot analysis showed SLIT1 mRNA is exclusively expressed in the brain, and in situ hybridization confirmed rat Slit1 is specifically expressed in neurons of fetal and adult forebrains, suggesting a conserved role in nervous system formation.","method":"cDNA cloning, Northern blot, in situ hybridization","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 2 — original cloning with expression characterization, moderate methods, single lab","pmids":["9813312"],"is_preprint":false},{"year":1998,"finding":"SLIT1 and SLIT2 were identified as large secreted proteins with multiple EGF-like motifs and LRR domains. Both genes are expressed during CNS development in the floor plate, roof plate, and developing motor neurons, paralleling Drosophila slit midline glial expression and implying conserved function in vertebrate midline axon guidance.","method":"cDNA cloning, in situ hybridization, protein domain analysis","journal":"Mechanisms of development","confidence":"Medium","confidence_rationale":"Tier 2 — original cloning with expression pattern, single lab, moderate methods","pmids":["10349621"],"is_preprint":false},{"year":2002,"finding":"Slit1 and Slit2 cooperate in vivo to repel retinal ganglion cell (RGC) axons and define the site of optic chiasm formation. Mice deficient in both Slit1 and Slit2 (but not single mutants) develop an ectopic anterior chiasm, with retinal axons projecting into the contralateral optic nerve and extending dorsally and laterally, demonstrating that Slit proteins establish a repulsive corridor channeling axons to the correct chiasm position.","method":"Genetic knockout (Slit1-/-, Slit2-/-, double mutant mice), anterograde axon tracing","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — clean genetic loss-of-function with specific in vivo phenotypic readout, highly cited, replicated by independent studies","pmids":["11804570"],"is_preprint":false},{"year":2002,"finding":"Slit1 and Slit2 together act as the septal chemorepellent controlling lateral olfactory tract (LOT) development. Explant co-culture with septum from Slit1/Slit2 double-deficient mice progressively abolished septal repulsive activity for olfactory bulb axons in a gene dose-dependent manner. In vivo anterograde tracing showed LOT is completely disorganized only in double-deficient embryos, with axons reaching the midline and entering the septum.","method":"Genetic knockout, in vitro explant co-culture repulsion assay, anterograde axon tracing in vivo","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro functional assay plus in vivo genetic epistasis, multiple methods, single lab","pmids":["12097499"],"is_preprint":false},{"year":2002,"finding":"Slit1 and Slit2 are expressed in the rat CNS with highly dynamic, largely complementary patterns relative to their Robo receptors from embryonic to adult stages. Postnatally, slit and robo expression is up-regulated in most brain regions, suggesting roles beyond axon pathfinding and in adult brain function.","method":"In situ hybridization (spatiotemporal expression mapping)","journal":"The Journal of comparative neurology","confidence":"Low","confidence_rationale":"Tier 3 — expression characterization only, no functional manipulation","pmids":["11754167"],"is_preprint":false},{"year":2002,"finding":"Genomic structure analysis showed SLIT1 is encoded by 37 exons covering at least 183 kb of human genomic DNA. EST database analysis revealed no additional Slit family members in mouse or human. Alternative splicing potential was identified through modular exon-intron organization, and mammalian SLIT1 promoters contain conserved double TCF/LEF and bHLH-binding sites, identifying SLIT1 as an evolutionarily conserved target of the WNT/β-catenin signaling pathway.","method":"Long-distance PCR, in silico genomic mapping, EST database analysis, comparative genomics","journal":"The International journal of developmental biology","confidence":"Low","confidence_rationale":"Tier 4 — computational/genomic analysis, no functional validation of WNT regulation","pmids":["12141424"],"is_preprint":false},{"year":2003,"finding":"Slit1 and Slit2 are not required for tangential migration of cortical interneurons from the basal telencephalon to the cortex, but are required for proper positioning of cholinergic neurons of the basal magnocellular complex. In vitro experiments with Slit1/Slit2 double-deficient mice showed the basal telencephalon repulsive activity for tangentially migrating cells is maintained, indicating other factors account for this repulsion, while Slit1/Slit2 regulate cell positioning near the midline.","method":"Genetic knockout (Slit1-/-, Slit2-/-, triple Slit1/Slit2/netrin1 mutants), in vitro repulsion assay, in vivo cell migration analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple mutant combinations plus in vitro validation, defines pathway specificity","pmids":["12642493"],"is_preprint":false},{"year":2003,"finding":"The homeobox transcription factor Irx4 is a crucial regulator of Slit1 expression in the chicken retina. Overexpression of Irx4 specifically downregulated Slit1 expression, while inhibition of Irx4 by a dominant-negative mutant induced Slit1 expression. Functional assays showed that Slit1 acts positively to guide retinal axons inside the optic fiber layer, providing intermediate targets during their growth within the retina.","method":"Gain-of-function overexpression, dominant-negative inhibition, in vivo retinal axon guidance assays","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal manipulations (gain/loss of Irx4 function) with mechanistic link to Slit1 expression and axon behavior, single lab","pmids":["12571096"],"is_preprint":false},{"year":2003,"finding":"Two divergent zebrafish slit1 orthologs, slit1a and slit1b, were cloned. Both predicted proteins contain conserved LRR and EGF motifs. slit1a is broadly expressed in the CNS, somites, and fin buds; slit1b is restricted to the olfactory system and retina. Both are expressed at the midline, suggesting conserved axon guidance roles, while divergent expression patterns imply distinct functions.","method":"cDNA cloning, in situ hybridization (zebrafish embryos)","journal":"Developmental dynamics","confidence":"Low","confidence_rationale":"Tier 3 — expression characterization of orthologs, no functional manipulation","pmids":["14579375"],"is_preprint":false},{"year":2004,"finding":"A novel alternative splice product of Slit1, designated Slit1alpha, was identified with highest expression in rat hippocampus and cerebral cortex. Slit1alpha arises through alternative splicing at the C-terminus causing a defect in the cysteine knot domain. In vitro assays demonstrated that Slit1alpha acts as a chemorepellent for olfactory bulb axon guidance, indicating it is a biologically active isoform specific to the vertebrate nervous system.","method":"RT-PCR, in situ hybridization, in vitro olfactory bulb chemorepulsion assay","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — functional in vitro assay demonstrating chemorepellent activity of the isoform, single lab","pmids":["15632296"],"is_preprint":false},{"year":2004,"finding":"SLIT1 promoter CpG islands are hypermethylated in glioma tumor cell lines (5 out of 6; 83%), with much lower frequency in primary glioma tumors (2 out of 20; 10%), demonstrating that epigenetic silencing via promoter hypermethylation contributes to SLIT1 transcriptional downregulation in brain tumors.","method":"Bisulfite sequencing, methylation analysis, RT-PCR, 5-aza-2'-deoxycytidine re-expression assay","journal":"British journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 — direct bisulfite sequencing of methylation plus pharmacological demethylation rescue of expression, single lab","pmids":["15534609"],"is_preprint":false},{"year":2005,"finding":"Slit1 and Slit2 proteins are selective inhibitors and repellents for dorsally projecting cranial motor axons in the hindbrain, but not for ventrally projecting motor axons. Analysis of Slit/Robo-deficient mice showed cranial motor axons aberrantly enter the midline; ectopic Slit1 expression in chick caused specific motor axon projection errors; and dominant-negative Robo expression in chick motoneurons caused axons to enter the midline or fail to exit the hindbrain.","method":"In vitro explant repulsion assay, genetic knockout analysis, ectopic overexpression in chick, dominant-negative Robo in vivo","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods across species (mouse KO, chick gain-of-function, dominant-negative) with defined cellular phenotype","pmids":["16162649"],"is_preprint":false},{"year":2006,"finding":"Slit1 and its receptor Robo2 are dynamically upregulated in adult rat dorsal root ganglion (DRG) after peripheral nerve injury (sciatic transection) but not after central axon injury (dorsal rhizotomy). Slit1 protein is expressed in satellite cells surrounding primary sensory neurons and accumulates in traumatic neuroma after axotomy, suggesting a role in peripheral nerve regeneration that is injury type-specific.","method":"In situ hybridization, immunohistochemistry, western blot, DRG axotomy model","journal":"Neuroscience research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple detection methods with injury-specific expression changes and cellular localization, single lab","pmids":["16979769"],"is_preprint":false},{"year":2007,"finding":"Slit1 is required for zonal segregation of olfactory sensory neuron (OSN) axons along the dorsoventral axis of the olfactory bulb. In slit-1-/- mice, a subset of OSN axons that normally project to the dorsal olfactory bulb mistarget and form glomeruli in the ventral region. Robo-2 is expressed in OSNs in a high dorsomedial to low ventrolateral gradient, and Slit-1 and Slit-3 are expressed in the ventral olfactory bulb, defining a repulsive mechanism for dorsoventral OSN targeting.","method":"Genetic knockout (slit-1-/-, robo-2-/-), axon tracing, in situ hybridization","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — clean genetic loss-of-function with specific in vivo targeting phenotype, receptor expression gradient characterized","pmids":["17715346"],"is_preprint":false},{"year":2008,"finding":"Robo2-Slit1 signaling mediates reciprocal cell-cell interactions between neural crest cells (which express Slit1) and placode cells (which express Robo2) required for trigeminal ganglion assembly in chick. Blocking Robo2 function or depleting either Robo2 or Slit1 by RNAi disrupted ganglion formation, mimicking neural crest ablation, establishing a novel role for Slit1 as a neural crest-derived ligand in cranial gangliogenesis.","method":"RNAi knockdown (Robo2 and Slit1), function-blocking antibodies, neural crest ablation, in ovo perturbation","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal loss-of-function experiments with specific cellular phenotype, multiple orthogonal approaches, published in high-impact journal","pmids":["18278043"],"is_preprint":false},{"year":2009,"finding":"N-cadherin acts in concert with Slit1-Robo2 signaling to mediate placodal cell adhesion during trigeminal gangliogenesis. Slit1-Robo2 signaling modulates N-cadherin protein levels on the placodal cell surface post-translationally (without changing total mRNA or protein). Co-expression of N-cadherin with dominant-negative Robo rescued the Robo2 loss-of-function phenotype, while N-cadherin loss reversed aberrant aggregation induced by increased Slit-Robo signaling.","method":"RNAi knockdown, dominant-negative receptor, overexpression, in ovo perturbation, epistasis analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with multiple orthogonal manipulations establishing post-translational mechanism and pathway hierarchy","pmids":["19934013"],"is_preprint":false},{"year":2010,"finding":"Recombinant soluble Slit1 protein promotes neurite outgrowth and elongation in adult rat dorsal root ganglion (DRG) neurons in vitro via binding to the Robo2 receptor. A recombinant human Robo2/Fc chimera competed with endogenous Robo2, inhibiting neurite outgrowth, and pre-treatment with Robo2/Fc chimera blocked Slit1-induced neurite growth, establishing Slit1-Robo2 as a signaling axis that promotes peripheral nerve regeneration.","method":"In vitro neurite outgrowth assay, recombinant protein treatment, competitive receptor blocking with Robo2/Fc chimera","journal":"Journal of chemical neuroanatomy","confidence":"Medium","confidence_rationale":"Tier 2 — receptor-ligand blocking experiment plus functional readout, single lab","pmids":["20172023"],"is_preprint":false},{"year":2010,"finding":"SLIT1 mRNA is enriched in the prefrontal cortex of Old World monkeys compared to primary sensory areas. This area-specific enrichment emerges postnatally: SLIT1 is broadly expressed perinatally, then progressively downregulated in early sensory areas around postnatal day 60, followed by association areas, resulting in relative enrichment in prefrontal cortex. Robo1 and Robo2 are more uniformly distributed, suggesting SLIT1 has a specific postnatal role in prefrontal connectivity.","method":"Restriction landmark cDNA scanning, in situ hybridization (developmental time series in Old World monkeys)","journal":"Cerebral cortex","confidence":"Low","confidence_rationale":"Tier 3 — expression characterization without functional manipulation, single species","pmids":["20123755"],"is_preprint":false},{"year":2011,"finding":"Sclerotome-derived Slit1 drives directional migration and fiber differentiation of Robo2-expressing pioneer myoblasts in avian embryos. Loss of Robo2 or sclerotome-derived Slit1 function perturbed directional cell migration and myofiber formation without affecting myoblast specification, and these effects were mediated through RhoA. Pioneer myoblasts express Robo2 downstream of MyoD and Myf5, and Slit1 is expressed in dermomyotome and caudal sclerotome.","method":"In ovo somite inversion, loss-of-function perturbations, expression analysis, RhoA pathway analysis","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined cellular phenotype and downstream pathway (RhoA) identified, single lab","pmids":["21653616"],"is_preprint":false},{"year":2011,"finding":"The SH2/SH3 adaptor protein Nck2 (but not Nck1) binds to Robo receptors via an atypical SH3-mediated mechanism and is specifically required for Slit1-induced changes in cortical neuron morphology in vitro. Slit1 stimulates cortical dendrite branching and promotes axon elongation; neurons from Robo1/Robo2-deficient mice do not show Slit1-induced neurite growth, establishing Robo as the mediator. Nck2 knockdown selectively abrogates Slit1-driven morphological changes, linking Robo to cytoskeletal rearrangement.","method":"Co-immunoprecipitation (SH3-mediated Nck-Robo binding), RNAi knockdown of Nck1/Nck2, Robo1/2 knockout neurons, in vitro morphology assays","journal":"Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 1-2 — Co-IP identifying binding partner, combined with genetic loss-of-function and specific morphological readout, defines adaptor-mediated signaling mechanism","pmids":["21600986"],"is_preprint":false},{"year":2013,"finding":"Steerable-filter quantitative analysis of optic chiasm axons in Slit1-/-, Slit2-/-, and double mutant mice revealed that Slit2 alone can act to control aspects of retinal axon routing across the ventral diencephalon midline. Slit1 single mutants showed very few axon defects, while Slit2 single mutants showed previously unreported misorientation and anterior shift of chiasm axons, confirming cooperative but distinct roles for the two proteins.","method":"Steerable-filter image analysis of labeled axon populations, genetic knockout (single and double mutants)","journal":"BMC neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — quantitative analysis across multiple genotypes with defined axon phenotypes, single lab","pmids":["23320558"],"is_preprint":false},{"year":2015,"finding":"At subrepellent (subthreshold) doses, Slit1 acts as a potent promoter of Netrin-1 chemotactic responses rather than as a repellent. On rostral thalamic axons, only a subthreshold concentration of Slit1 enabled an attractive response to a Netrin-1 gradient; on hippocampal neurons, subthreshold Slit1 triggered either attractive or repulsive responses to Netrin-1 depending on substrate. This combinatorial activity was demonstrated using a microfluidic gradient device with both dissociated neurons and explant cultures.","method":"Microfluidic gradient device, dissociated neuron cultures and explant cultures, quantitative axon turning assays","journal":"Neural development","confidence":"High","confidence_rationale":"Tier 1-2 — innovative quantitative method with multiple cell types and substrates, reveals unexpected combinatorial guidance mechanism","pmids":["25888985"],"is_preprint":false},{"year":2018,"finding":"Fibroblast growth factor receptor 1 (Fgfr1) signaling transcriptionally regulates slit1 expression in a cell-autonomous manner. A 2.3 kb Fgfr1-responsive slit1 promoter sequence was identified that recapitulates endogenous spatiotemporal expression in the neural tube and eye of Xenopus embryos. Signaling through Fgfr1 (but not other Fgfr subtypes, even when co-expressed) specifically controls slit1 forebrain expression both in vitro and in vivo.","method":"Reporter gene assay (promoter-GFP in Xenopus), in vitro promoter activity in A6 cells, Fgfr subtype-specific manipulation, in vivo Xenopus forebrain expression analysis","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — multiple complementary approaches (in vitro and in vivo) identifying specific upstream regulator of slit1 transcription, single lab","pmids":["29705951"],"is_preprint":false},{"year":2018,"finding":"SUV39H2, a histone H3 lysine 9 methyltransferase, directly binds the SLIT1 promoter and suppresses SLIT1 transcription by catalyzing H3K9 tri-methylation. SUV39H2 knockdown relieved SLIT1 repression, and rescue assays showed SLIT1 antagonizes SUV39H2-driven colorectal cancer proliferation and metastasis, establishing SLIT1 as a direct epigenetic target of SUV39H2.","method":"ChIP (SUV39H2 binding to SLIT1 promoter), H3K9me3 ChIP, siRNA knockdown, rescue overexpression, in vitro and in vivo cancer assays","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 1-2 — direct ChIP evidence for promoter binding and H3K9me3 mark, combined with functional rescue, identifies specific epigenetic writer-target relationship","pmids":["29458143"],"is_preprint":false},{"year":2019,"finding":"ATP-P2X7 receptor signaling in satellite glial cells (SGCs) regulates Slit1 expression in dorsal root ganglia after peripheral nerve injury. After sciatic nerve crush, Slit1 expression increases first in neurons then with a time lag in surrounding SGCs, induced by contact with adjacent neuronal somas. Inhibition of P2X7 receptor with BBG reduced Slit1 expression in SGCs and increased VNUT (vesicular nucleotide transporter) in neurons, identifying the ATP-P2X7R pathway as a signal transduction mechanism from injured neurons to SGCs that drives Slit1 upregulation.","method":"Immunohistochemistry, western blot, fluorescent gold retrograde tracing, double immunofluorescence, P2X7R inhibitor injection in vivo","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods identifying upstream signaling pathway for Slit1 regulation in SGCs with pharmacological intervention, single lab","pmids":["31607866"],"is_preprint":false},{"year":2020,"finding":"Slit1 protein regulates the mobilization of SVZ-derived neural precursor cells (NPCs) after CNS demyelination. In Slit1-/- mice, the number of SVZ-NPCs recruited to demyelinating corpus callosum lesions is increased, leading to higher numbers of Olig2+ cells within the lesion. Time-lapse video-microscopy showed Slit1-deficient NPCs migrate faster and make more frequent directional changes than controls, supporting a cell-autonomous mechanism. Slits and Robos are also transcriptionally regulated in the SVZ in response to demyelination.","method":"Slit1 knockout mice, lysolecithin-induced demyelination model, SVZ microdissection, RT-PCR, time-lapse video-microscopy of immunopurified NPCs, immunohistochemistry","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with specific cellular phenotype, cell-autonomous mechanism confirmed by live imaging, multiple methods","pmids":["32670024"],"is_preprint":false},{"year":2020,"finding":"Lhx2 functions as an indirect repressor of slit1 expression in the Xenopus forebrain: Lhx2 overexpression downregulates slit1 mRNA and decreases slit1 promoter activity in vitro; the constitutive repressor fusion Lhx2-En increases slit1 induction. Conversely, Etv1 gain-of-function transactivates slit1 both in vitro and in the forebrain. Together, Lhx2/9 and Etv1 act as complementary downstream effectors of Fgf signaling to establish proper slit1 expression boundaries.","method":"Promoter-reporter assay, gain-of-function overexpression, constitutive activator/repressor fusion constructs, in vivo Xenopus forebrain expression analysis","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — multiple complementary transcription factor manipulations with both in vitro and in vivo validation, single lab","pmids":["32200077"],"is_preprint":false},{"year":2021,"finding":"SLIT1 is downregulated specifically in the ventromedial prefrontal cortex (vmPFC) of women (but not men) with depression. Knockdown of Slit1 in vmPFC of female mice combined with stress induced sex-specific increases in anxiety- and depression-related behaviors, decreased dendritic arborization of pyramidal neurons, and decreased neuronal excitability—effects not observed in males. RNA sequencing after Slit1 knockdown revealed an augmented transcriptional stress signature in females.","method":"Viral-mediated Slit1 knockdown in vmPFC, chronic variable stress, behavioral testing, electrophysiology, dendritic morphology analysis, RNA sequencing","journal":"Biological psychiatry","confidence":"High","confidence_rationale":"Tier 2 — targeted loss-of-function in specific brain region with multiple orthogonal readouts (behavior, electrophysiology, morphology, transcriptomics), defines sex-specific mechanism","pmids":["33896623"],"is_preprint":false},{"year":2022,"finding":"miR-640 targets SLIT1 and the miR-640-SLIT1 axis regulates radiosensitivity of glioma cells through the Wnt/β-catenin signaling pathway. SLIT1 knockdown reduced radioresistance, migration, and invasion while increasing apoptosis. Loss of miR-640 activity upregulated SLIT1, Wnt, and β-catenin protein expression and inhibited p-GSK-3β, suggesting SLIT1 activates Wnt/β-catenin signaling to promote glioma radioresistance.","method":"siRNA knockdown, miRNA inhibitor transfection, western blot, CCK-8 proliferation assay, wound healing, transwell invasion, caspase-3 assay","journal":"British journal of biomedical science","confidence":"Medium","confidence_rationale":"Tier 3 — functional assays with pathway analysis, single lab, limited mechanistic depth","pmids":["35996510"],"is_preprint":false},{"year":2024,"finding":"Slit1 inhibits ovarian follicle development and female fertility in mice via an autocrine/paracrine mechanism. Slit1-null female mice produce larger litters due to increased ovulation rates and greater numbers of healthy antral follicles. Exogenous SLIT1 induces granulosa cell apoptosis and inhibits gonadotropin-stimulated AKT phosphorylation. SLIT1 pretreatment of cultured granulosa cells inhibited both FSH- and LH-induced AKT phosphorylation, identifying SLIT1 as a novel antagonist of gonadotropin-AKT signaling in the ovary.","method":"Slit1 knockout mice, granulosa cell culture, exogenous recombinant SLIT1 treatment, AKT phosphorylation assays, apoptosis assays, follicle counting, ovulation rate measurement","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function plus in vitro mechanistic dissection with specific signaling readout (AKT phosphorylation), multiple orthogonal methods","pmids":["38943353"],"is_preprint":false},{"year":2024,"finding":"Slit1 promotes hypertrophic scar (HTS) formation through TGF-β signaling. Recombinant Slit1 treatment of normal human fibroblasts promoted cell proliferation, differentiation (increased α-SMA, collagen I/III, fibronectin), migration (with increased N-cadherin and vimentin, decreased E-cadherin), and activated both SMAD pathway proteins (SMAD2, SMAD3, SMAD1/5/8) and non-SMAD pathway proteins (TAK1, JNK1, ERK1/2, p38).","method":"Recombinant human Slit1 protein treatment, western blot, RT-qPCR, cell viability assay, scratch migration assay, phospho-protein analysis","journal":"Medicina (Kaunas, Lithuania)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple signaling readouts with recombinant protein, single lab, no genetic loss-of-function validation","pmids":["39768930"],"is_preprint":false},{"year":2025,"finding":"Neuronal Slit1 secreted from hypoxic neurons directly targets oligodendrocyte precursor cells (OPCs) via Robo2-srGAP1-RhoA signaling to promote oligodendrocyte differentiation and myelination. Conditional ablation of Slit1 in neurons exacerbated hypoxia-induced hypomyelination and motor/cognitive deficits. Pharmacological RhoA inhibition restored myelination in adolescent mice. A natural variant with higher Slit1 expression was identified in Tibetan populations adapted to low oxygen, validating the pathway's physiological importance.","method":"Conditional neuron-specific Slit1 knockout, chronic hypoxia mouse model, pharmacological RhoA inhibition, behavioral testing, pathway analysis (Robo2-srGAP1-RhoA), natural selection/population genetics analysis","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — cell-type-specific conditional knockout with defined downstream signaling pathway (Robo2-srGAP1-RhoA), pharmacological rescue, and evolutionary validation","pmids":["40117292"],"is_preprint":false},{"year":2025,"finding":"SLIT1 and SLIT2 share redundant functions and mechanisms of action in ovarian granulosa cells. RNA-seq showed SLIT1 upregulated 612 and downregulated 601 genes in granulosa cells. SLIT1 antagonizes FSH- (but not LH-) induced FOXO1 phosphorylation; SLIT2 (but not SLIT3) similarly antagonizes FSH-stimulated AKT and FOXO1 signaling. Both SLIT1 and SLIT2 induce granulosa cell apoptosis. Loss of ROBO1 did not inhibit SLIT1 or SLIT2 AKT/FOXO1 antagonism, indicating ROBO1 is not the sole receptor.","method":"RNA-seq, exogenous recombinant SLIT1/2/3 treatment, AKT and FOXO1 phosphorylation assays, Robo1 knockout granulosa cells, apoptosis assays","journal":"Reproduction (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 1-2 — RNA-seq combined with defined signaling pathway analysis (AKT/FOXO1), receptor knockout validation, multiple ligand comparisons, establishes specificity","pmids":["40996529"],"is_preprint":false}],"current_model":"SLIT1 is a secreted glycoprotein with LRR and EGF-like domains that acts as a repulsive axon guidance cue through Robo receptors (primarily Robo2), cooperating with SLIT2 to channel retinal axons at the optic chiasm, organize olfactory tract and olfactory bulb zonal targeting, and guide motor axons in the hindbrain; beyond axon guidance, SLIT1 regulates neural crest-placode interactions during trigeminal gangliogenesis via Robo2 (modulating N-cadherin surface levels post-translationally), promotes peripheral nerve regeneration and SVZ-derived precursor migration, drives pioneer myoblast directional migration through RhoA downstream of Robo2, promotes oligodendrocyte differentiation under hypoxia via Robo2-srGAP1-RhoA, enables combinatorial guidance by potentiating Netrin-1 responses at subthreshold concentrations, inhibits ovarian follicle development by antagonizing gonadotropin-AKT/FOXO1 signaling, and modulates stress-induced neurophysiology in the female vmPFC; its transcription is controlled by Fgfr1 signaling (through Etv1/Lhx2), Irx4, and is silenced by SUV39H2-mediated H3K9 tri-methylation and by promoter CpG hypermethylation in tumors."},"narrative":{"teleology":[{"year":1998,"claim":"Cloning of mammalian SLIT1 established it as a brain-specific secreted protein with conserved LRR and EGF-like domains, providing the molecular foundation for investigating vertebrate axon guidance.","evidence":"cDNA cloning, Northern blot, and in situ hybridization in rat and human tissues","pmids":["9813312","10349621"],"confidence":"Medium","gaps":["No functional assay performed","Receptor identity unknown","No loss-of-function data"]},{"year":2002,"claim":"Double-knockout studies revealed that SLIT1 and SLIT2 cooperatively establish repulsive corridors for retinal axons at the optic chiasm and for olfactory bulb axons in the lateral olfactory tract, demonstrating genetic redundancy and defining the first in vivo guidance functions.","evidence":"Slit1−/−, Slit2−/−, and double-mutant mice with anterograde axon tracing and explant co-culture repulsion assays","pmids":["11804570","12097499"],"confidence":"High","gaps":["Relative contribution of each Slit ligand to individual guidance decisions unclear","Downstream signaling mediators not identified","Whether Robo1 vs Robo2 mediates these specific responses not resolved"]},{"year":2005,"claim":"SLIT1 was shown to selectively repel dorsally projecting cranial motor axons but not ventrally projecting ones, establishing subtype specificity of Slit-Robo guidance in the hindbrain.","evidence":"Slit/Robo-deficient mouse analysis, ectopic Slit1 expression in chick, dominant-negative Robo expression in motoneurons","pmids":["16162649"],"confidence":"High","gaps":["Molecular basis for selectivity between dorsal and ventral motor neuron subtypes unresolved","Identity of Robo subtype(s) mediating this selectivity not determined"]},{"year":2007,"claim":"Slit1 knockout mice revealed a specific role for SLIT1 in dorsoventral zonal targeting of olfactory sensory neuron axons, distinguishing its function from the redundant Slit1/Slit2 roles seen in other systems.","evidence":"Slit-1−/− and Robo-2−/− mice with axon tracing and expression gradient analysis in the olfactory bulb","pmids":["17715346"],"confidence":"High","gaps":["Contribution of Slit3 to ventral repulsion not genetically dissected","How Robo2 gradient is established in OSNs unknown"]},{"year":2008,"claim":"Discovery that neural crest-derived SLIT1 signals through placodal Robo2 to assemble the trigeminal ganglion established a non-canonical role for Slit-Robo in cell–cell adhesive interactions during gangliogenesis.","evidence":"RNAi knockdown of Slit1/Robo2, function-blocking antibodies, neural crest ablation in chick embryos","pmids":["18278043"],"confidence":"High","gaps":["Intracellular signaling cascade in placodal cells not fully elucidated"]},{"year":2009,"claim":"Epistasis experiments showed SLIT1-Robo2 signaling modulates N-cadherin surface levels post-translationally in placode cells, providing the first mechanistic link between Slit-Robo and adhesion molecule trafficking.","evidence":"RNAi, dominant-negative Robo, N-cadherin co-expression rescue, in ovo perturbation with epistasis analysis","pmids":["19934013"],"confidence":"High","gaps":["Trafficking mechanism (endocytosis vs exocytosis of N-cadherin) not defined","Whether this mechanism operates in other Slit-Robo contexts unknown"]},{"year":2011,"claim":"Identification of the adaptor Nck2 as a Robo-binding partner specifically required for Slit1-induced cortical neurite morphology changes linked the receptor to cytoskeletal remodeling, and parallel work showed Slit1-Robo2-RhoA drives pioneer myoblast migration.","evidence":"Co-immunoprecipitation of Nck2-Robo, Nck2 RNAi in Robo1/2 KO cortical neurons; in ovo somite manipulations with RhoA pathway analysis for myoblast migration","pmids":["21600986","21653616"],"confidence":"High","gaps":["Whether Nck2 and RhoA operate in the same or parallel downstream branches unresolved","Structural basis of Nck2-Robo interaction not determined"]},{"year":2015,"claim":"Subthreshold concentrations of Slit1 were found to potentiate Netrin-1 chemotactic responses rather than simply repelling axons, revealing an unexpected combinatorial guidance code.","evidence":"Microfluidic gradient device with quantitative axon turning assays on rostral thalamic and hippocampal neurons","pmids":["25888985"],"confidence":"High","gaps":["Molecular mechanism of Slit-Netrin crosstalk at the receptor level not identified","Whether this combinatorial activity operates in vivo not tested"]},{"year":2018,"claim":"SLIT1 transcription was shown to be under dual epigenetic and signaling control: Fgfr1-Etv1 activates the slit1 promoter in the forebrain, while SUV39H2-mediated H3K9me3 silences SLIT1 in colorectal cancer, identifying upstream regulatory nodes.","evidence":"Promoter-reporter assays in Xenopus and cell lines for Fgfr1/Etv1; ChIP for SUV39H2 binding and H3K9me3 at SLIT1 promoter with siRNA rescue in cancer cells","pmids":["29705951","29458143"],"confidence":"Medium","gaps":["Whether Fgfr1-Etv1 regulation is conserved in mammals not confirmed","Identity of chromatin readers downstream of H3K9me3 at SLIT1 locus unknown","Fgfr1 study in Xenopus only"]},{"year":2021,"claim":"Targeted Slit1 knockdown in female mouse vmPFC combined with stress produced depression-related behaviors, reduced dendritic arborization, and decreased neuronal excitability, establishing SLIT1 as a sex-specific modulator of stress vulnerability in the adult brain.","evidence":"Viral-mediated vmPFC Slit1 knockdown, chronic variable stress, behavioral testing, electrophysiology, dendritic morphology, RNA-seq","pmids":["33896623"],"confidence":"High","gaps":["Downstream receptor and signaling pathway in vmPFC neurons not identified","Whether SLIT1 acts cell-autonomously or through paracrine signaling in vmPFC not resolved","Basis of sex specificity unknown"]},{"year":2024,"claim":"SLIT1 was identified as an inhibitor of ovarian follicle development that antagonizes gonadotropin-stimulated AKT phosphorylation in granulosa cells, extending SLIT1 function to reproductive physiology.","evidence":"Slit1 knockout mice with increased ovulation and fertility, recombinant SLIT1 treatment of granulosa cells with AKT phosphorylation and apoptosis assays","pmids":["38943353"],"confidence":"High","gaps":["Identity of the SLIT1 receptor on granulosa cells not established (ROBO1 knockout did not abolish signaling)","Mechanism of AKT antagonism not defined"]},{"year":2025,"claim":"Neuron-derived SLIT1 was shown to promote oligodendrocyte differentiation under hypoxia via a Robo2–srGAP1–RhoA pathway, with pharmacological RhoA inhibition rescuing myelination deficits, and a human population genetics link to high-altitude adaptation was identified.","evidence":"Conditional neuron-specific Slit1 knockout in chronic hypoxia model, RhoA inhibitor rescue, behavioral testing, Tibetan population variant analysis","pmids":["40117292"],"confidence":"High","gaps":["How hypoxia regulates neuronal SLIT1 secretion not defined","Whether srGAP1 is the sole RhoGAP mediating this response not tested"]},{"year":2025,"claim":"RNA-seq and receptor-knockout analysis in granulosa cells demonstrated that SLIT1 and SLIT2 share redundant antagonism of FSH-AKT/FOXO1 signaling and that ROBO1 is not the sole mediating receptor, narrowing the receptor identity question.","evidence":"RNA-seq of SLIT1-treated granulosa cells, recombinant SLIT1/2/3 comparative treatment, Robo1 knockout granulosa cells, AKT/FOXO1 phosphorylation assays","pmids":["40996529"],"confidence":"High","gaps":["Identity of the non-ROBO1 receptor for SLIT1 in granulosa cells remains unknown","In vivo genetic validation of SLIT2 redundancy in fertility not yet performed"]},{"year":null,"claim":"The identity of the SLIT1 receptor in non-neuronal tissues (granulosa cells, fibroblasts), the structural basis of concentration-dependent switching between repulsion and Netrin-1 potentiation, and the mechanism underlying sex-specific SLIT1 effects in the adult prefrontal cortex remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of SLIT1-Robo2 complex available","Concentration-dependent signaling switch mechanism not defined at molecular level","Sex-specific chromatin or hormonal regulation of SLIT1 in brain not characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[2,3,11,13,14,16,21,29,31]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[21,29,32]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0,1,2,3,14,16,29,31]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,3,7,11,13,14,15,18]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[2,3,11,13,19,21,25,27,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[15,19,29,31,32]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[29,32]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[29,32]}],"complexes":[],"partners":["ROBO2","ROBO1","NCK2","SRGAP1","SLIT2"],"other_free_text":[]},"mechanistic_narrative":"SLIT1 is a secreted glycoprotein containing leucine-rich repeat and EGF-like domains that functions as a repulsive axon guidance cue through Robo receptors, with roles extending beyond neural wiring to cell migration, myelination, ovarian physiology, and stress-related neuroplasticity. During development, SLIT1 cooperates with SLIT2 to channel retinal ganglion cell axons at the optic chiasm, organize the lateral olfactory tract, and repel dorsally projecting cranial motor axons, while independently directing olfactory sensory neuron zonal targeting via Robo2 and mediating neural crest–placode interactions during trigeminal gangliogenesis through post-translational modulation of N-cadherin surface levels [PMID:11804570, PMID:12097499, PMID:17715346, PMID:18278043, PMID:19934013]. Beyond axon guidance, SLIT1 promotes oligodendrocyte differentiation under hypoxia through a Robo2–srGAP1–RhoA signaling axis, inhibits ovarian follicle development by antagonizing gonadotropin-stimulated AKT/FOXO1 signaling in granulosa cells, and modulates stress-induced dendritic remodeling and neuronal excitability in the female ventromedial prefrontal cortex [PMID:40117292, PMID:38943353, PMID:33896623]. SLIT1 transcription is positively regulated by Fgfr1 signaling through Etv1 and negatively regulated by Irx4, Lhx2, and SUV39H2-mediated H3K9 trimethylation, and its promoter is subject to CpG hypermethylation-driven silencing in tumors [PMID:29705951, PMID:29458143, PMID:12571096]."},"prefetch_data":{"uniprot":{"accession":"O75093","full_name":"Slit homolog 1 protein","aliases":["Multiple epidermal growth factor-like domains protein 4","Multiple EGF-like domains protein 4"],"length_aa":1534,"mass_kda":167.9,"function":"Thought to act as molecular guidance cue in cellular migration, and function appears to be mediated by interaction with roundabout homolog receptors. During neural development involved in axonal navigation at the ventral midline of the neural tube and projection of axons to different regions (By similarity). SLIT1 and SLIT2 together seem to be essential for midline guidance in the forebrain by acting as repulsive signal preventing inappropriate midline crossing by axons projecting from the olfactory bulb","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/O75093/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLIT1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLIT1","total_profiled":1310},"omim":[{"mim_id":"621003","title":"TRANSCRIPTION FACTOR Sp9; SP9","url":"https://www.omim.org/entry/621003"},{"mim_id":"618687","title":"INTELLECTUAL DEVELOPMENTAL DISORDER WITH SHORT STATURE AND BEHAVIORAL ABNORMALITIES; IDDSSBA","url":"https://www.omim.org/entry/618687"},{"mim_id":"615146","title":"UBIQUITIN-SPECIFIC PROTEASE 33; USP33","url":"https://www.omim.org/entry/615146"},{"mim_id":"612810","title":"LEUCINE-RICH REPEAT AND FIBRONECTIN TYPE III DOMAIN-CONTAINING PROTEIN 4; LRFN4","url":"https://www.omim.org/entry/612810"},{"mim_id":"612809","title":"LEUCINE-RICH REPEAT AND FIBRONECTIN TYPE III DOMAIN-CONTAINING PROTEIN 3; LRFN3","url":"https://www.omim.org/entry/612809"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"brain","ntpm":32.7},{"tissue":"pituitary gland","ntpm":12.6}],"url":"https://www.proteinatlas.org/search/SLIT1"},"hgnc":{"alias_symbol":["MEGF4","Slit-1","SLIT3"],"prev_symbol":["SLIL1"]},"alphafold":{"accession":"O75093","domains":[{"cath_id":"3.80.10.10","chopping":"280-441","consensus_level":"medium","plddt":87.3114,"start":280,"end":441},{"cath_id":"3.80.10.10","chopping":"514-673","consensus_level":"medium","plddt":90.0444,"start":514,"end":673},{"cath_id":"3.80.10.10","chopping":"737-927","consensus_level":"medium","plddt":87.0874,"start":737,"end":927},{"cath_id":"-","chopping":"935-962","consensus_level":"medium","plddt":76.9389,"start":935,"end":962},{"cath_id":"2.60.120.200","chopping":"1153-1341","consensus_level":"high","plddt":77.1599,"start":1153,"end":1341},{"cath_id":"2.10.90","chopping":"1458-1533","consensus_level":"high","plddt":83.8584,"start":1458,"end":1533}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75093","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75093-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75093-F1-predicted_aligned_error_v6.png","plddt_mean":79.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLIT1","jax_strain_url":"https://www.jax.org/strain/search?query=SLIT1"},"sequence":{"accession":"O75093","fasta_url":"https://rest.uniprot.org/uniprotkb/O75093.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75093/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75093"}},"corpus_meta":[{"pmid":"11804570","id":"PMC_11804570","title":"Slit1 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B","url":"https://pubmed.ncbi.nlm.nih.gov/35256949","citation_count":66,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"16162649","id":"PMC_16162649","title":"Slit-mediated repulsion is a key regulator of motor axon pathfinding in the hindbrain.","date":"2005","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16162649","citation_count":64,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20163849","id":"PMC_20163849","title":"Polymorphisms involved in the miR-218-LAMB3 pathway and susceptibility of cervical cancer, a case-control study in Chinese women.","date":"2010","source":"Gynecologic oncology","url":"https://pubmed.ncbi.nlm.nih.gov/20163849","citation_count":55,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18566128","id":"PMC_18566128","title":"Novel regulated expression of the SLIT/ROBO pathway in the ovary: possible role during luteolysis in women.","date":"2008","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/18566128","citation_count":50,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36138187","id":"PMC_36138187","title":"NUDT21 limits CD19 levels through alternative mRNA polyadenylation in B cell acute lymphoblastic leukemia.","date":"2022","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36138187","citation_count":46,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21465248","id":"PMC_21465248","title":"Expression and roles of Slit/Robo in human ovarian cancer.","date":"2011","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/21465248","citation_count":42,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"11748139","id":"PMC_11748139","title":"Slit proteins are not dominant chemorepellents for olfactory tract and spinal motor axons.","date":"2001","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/11748139","citation_count":40,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"26542734","id":"PMC_26542734","title":"Function of Slit/Robo signaling in breast cancer.","date":"2015","source":"Frontiers of medicine","url":"https://pubmed.ncbi.nlm.nih.gov/26542734","citation_count":29,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"24158112","id":"PMC_24158112","title":"Experimental validation of 5 in-silico predicted glioma biomarkers.","date":"2013","source":"Neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/24158112","citation_count":28,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"18628988","id":"PMC_18628988","title":"Neither replication nor simulation supports a role for the axon guidance pathway in the genetics of Parkinson's disease.","date":"2008","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/18628988","citation_count":16,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"19228371","id":"PMC_19228371","title":"Non-replication of an association of CTNNBL1 polymorphisms and obesity in a population of Central European ancestry.","date":"2009","source":"BMC medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19228371","citation_count":12,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12141424","id":"PMC_12141424","title":"Conserved modularity and potential for alternate splicing in mouse and human Slit genes.","date":"2002","source":"The International journal of developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/12141424","citation_count":11,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52597,"output_tokens":5153,"usd":0.117543},"stage2":{"model":"claude-opus-4-6","input_tokens":8685,"output_tokens":3171,"usd":0.18405},"total_usd":0.709842,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":66171,"output_tokens":9784,"usd":0.172636},"round2_rules_fired":"R2","round2_stage2":{"model":"claude-opus-4-6","input_tokens":13245,"output_tokens":3634,"usd":0.235613}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"Slit1 and Slit2 cooperate to repel retinal ganglion cell axons in vivo, channeling them through a corridor that defines the optic chiasm position; double knockout mice develop an ectopic anterior chiasm, demonstrating functional redundancy between the two ligands.\",\n      \"method\": \"Genetic knockout (single and double Slit1/Slit2 null mice), anterograde axon tracing\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, replicated across double-mutant combinations\",\n      \"pmids\": [\"11804570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Slit1 and Slit2 together constitute the chemorepellent activity of the embryonic septum that guides lateral olfactory tract axons; loss of both genes abolishes septal repulsion in vitro and completely disorganizes the LOT in vivo, with axons reaching the midline.\",\n      \"method\": \"Co-culture repulsion assay with Slit1/Slit2 single and double null septum explants; anterograde tracing of olfactory bulb axons in vivo\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (in vitro repulsion assay + in vivo tracing) in KO animals\",\n      \"pmids\": [\"12097499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Slit1 and Slit2 regulate neuronal positioning within the basal telencephalon (e.g., cholinergic neurons of the basal magnocellular complex), but are not required for tangential migration of interneurons to the cortex; the repulsive activity driving interneuron migration is maintained in Slit1/Slit2/Netrin-1 triple null mice.\",\n      \"method\": \"Genetic epistasis (Slit1-/-, Slit2-/-, double and triple knockout mice with netrin-1); in vitro migration assays; in vivo analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistatic analysis in multiple KO combinations with defined cellular phenotypes\",\n      \"pmids\": [\"12642493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Irx4 homeodomain transcription factor negatively regulates Slit1 expression in the chicken retina; Irx4 overexpression downregulates Slit1, dominant-negative Irx4 induces Slit1, and Slit1 positively guides retinal axons within the optic fiber layer.\",\n      \"method\": \"In vivo overexpression of Irx4 and dominant-negative Irx4 in chicken retina; in vivo axon guidance assays for Slit1\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss/gain-of-function with defined phenotype, single lab\",\n      \"pmids\": [\"12571096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Slit1 expressed in the ventral olfactory bulb acts through Robo2 (expressed in a high dorsomedial to low ventrolateral gradient on olfactory sensory neurons) to segregate OSN axons along the dorsoventral axis; slit1-/- and robo2-/- mice show mistargeting of dorsal OSN axons to the ventral OB.\",\n      \"method\": \"Genetic knockout (slit1-/-, robo2-/-), receptor expression gradient mapping, in vivo axon targeting analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal KO phenotypes in two genes of the same pathway with defined axon targeting defect\",\n      \"pmids\": [\"17715346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Slit1 expressed on early migrating cranial neural crest cells signals through Robo2 on ingressing placode cells to mediate neural crest–placode cell interactions required for trigeminal ganglion assembly; siRNA depletion of either Robo2 or Slit1 disrupts ganglion formation, mimicking neural crest ablation.\",\n      \"method\": \"Robo2 blocking antibody, siRNA knockdown of Robo2 and Slit1 in chick embryo, neural crest ablation\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal perturbations (antibody block, siRNA for ligand and receptor) with consistent phenotype\",\n      \"pmids\": [\"18278043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Slit1–Robo2 signaling modulates N-cadherin protein levels on the placodal cell surface (post-translationally, without changing total N-cadherin mRNA or protein), thereby controlling placodal cell adhesion and gangliogenesis; N-cadherin and Slit1-Robo2 act in concert to aggregate placode-derived trigeminal neurons.\",\n      \"method\": \"Dominant-negative Robo, siRNA knockdown, N-cadherin depletion, co-expression rescue experiments in chick embryo\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genetic manipulations demonstrating epistatic and co-regulatory relationship\",\n      \"pmids\": [\"19934013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Slit1 promotes neurite outgrowth and elongation of adult dorsal root ganglion neurons through binding to the Robo2 receptor; recombinant Robo2/Fc chimera (acting as decoy) blocks Slit1-induced outgrowth.\",\n      \"method\": \"Recombinant Slit1 protein treatment of cultured adult DRG neurons; recombinant Robo2/Fc chimera blocking experiment\",\n      \"journal\": \"Journal of chemical neuroanatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro gain- and loss-of-function with receptor decoy, single lab\",\n      \"pmids\": [\"20172023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sclerotome-derived Slit1 signals through Robo2 on pioneer myoblasts to direct their rostrocaudal migration and differentiation into myotomal fibers via RhoA; loss of Robo2 or sclerotome-specific Slit1 function perturbs directional migration and desmin expression without affecting myoblast specification.\",\n      \"method\": \"Avian somite inversion, Robo2/Slit1 loss-of-function in chick embryo, RhoA pathway analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined phenotype and pathway placement (RhoA), single lab\",\n      \"pmids\": [\"21653616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Slit1 stimulates cortical axon elongation and dendrite branching through Robo1/Robo2 receptors; Robo1;Robo2 double-deficient neurons fail to respond to Slit1. The adaptor protein Nck2, but not Nck1, is specifically required downstream of Robo for Slit1-induced cortical neuron morphological changes; Nck1 and Nck2 bind Robo via an atypical SH3-mediated mechanism.\",\n      \"method\": \"Robo1;Robo2 double-knockout neurons, Nck1/Nck2 knockdown, Robo pulldown/binding assays, in vitro neurite outgrowth assays\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — KO neurons + adaptor binding pulldown + morphological phenotype rescue, multiple orthogonal methods\",\n      \"pmids\": [\"21600986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"At subrepellent (subthreshold) concentrations, Slit1 promotes Netrin-1 chemotactic responses in rostral thalamic axons and hippocampal neurons; the nature of the response (attractive vs. repulsive) to Netrin-1 depends on the substrate context.\",\n      \"method\": \"Microfluidic gradient device with explant and dissociated neuron cultures; quantitative axon turning assays\",\n      \"journal\": \"Neural development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative combinatorial guidance assay with substrate variation, single lab\",\n      \"pmids\": [\"25888985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SUV39H2 directly binds the SLIT1 promoter and catalyzes H3K9 tri-methylation to suppress SLIT1 transcription, thereby promoting colorectal cancer proliferation and metastasis; SLIT1 antagonizes these SUV39H2-driven effects.\",\n      \"method\": \"ChIP showing SUV39H2 binding to SLIT1 promoter and H3K9me3 deposition; rescue assay with SLIT1 re-expression; in vitro and in vivo cancer models\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP (writer identified) plus rescue assay, single lab\",\n      \"pmids\": [\"29458143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FGFR1 signaling is the primary transcriptional regulator of slit1 expression; a 2.3 kb slit1 promoter sequence is Fgf-responsive and recapitulates endogenous slit1 expression in Xenopus neural tube and eye; signaling specifically through Fgfr1 (not other Fgfr subtypes) drives slit1 forebrain expression in a cell-autonomous manner.\",\n      \"method\": \"Slit1 promoter reporter assay in Xenopus embryos; Fgfr subtype-specific signaling perturbations in vitro and in vivo\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter + in vivo Fgfr subtype perturbation, single lab\",\n      \"pmids\": [\"29705951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Slit1 regulates adult SVZ-derived neural precursor cell (NPC) migration in response to CNS demyelination: Slit1-deficient NPCs migrate faster and make more directional changes (cell-autonomous effect), and more NPCs are recruited to demyelination lesions in Slit1-/- mice, increasing oligodendrocyte renewal.\",\n      \"method\": \"Slit1-null mouse model; cuprizone demyelination model; time-lapse video-microscopy of immuno-purified NPCs; Olig2+ cell quantification in lesions\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined cellular phenotype and live-imaging confirmation of cell-autonomous migration effect\",\n      \"pmids\": [\"32670024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SLIT1 knockdown in the female (but not male) vmPFC increases anxiety- and depression-like behaviors when combined with stress, decreases dendritic arborization and excitability of vmPFC pyramidal neurons, and augments the transcriptional stress signature—establishing a sex-specific role for SLIT1 in stress susceptibility.\",\n      \"method\": \"Viral-mediated Slit1 knockdown in mouse vmPFC; chronic variable stress; electrophysiology; dendritic morphology analysis; RNA sequencing\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KD with multiple orthogonal readouts (behavior, electrophysiology, morphology, transcriptomics), single lab\",\n      \"pmids\": [\"33896623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A splice variant of Slit1, termed Slit1α, is generated by alternative splicing at the C-terminus causing loss of the cysteine knot domain; it is expressed in hippocampus and cerebral cortex and retains chemorepellent activity on olfactory bulb axons in vitro.\",\n      \"method\": \"RT-PCR cloning; in situ hybridization; olfactory bulb axon repulsion assay in vitro\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, partial characterization of isoform function\",\n      \"pmids\": [\"15632296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SLIT1 promotes hypertrophic scar formation by activating SMAD (SMAD2/3/1/5/8) and non-SMAD (TAK1, JNK1, ERK1/2, p38) TGF-β signaling pathways in fibroblasts, as well as promoting EMT (increased N-cadherin/vimentin, decreased E-cadherin) and ECM component production (α-SMA, collagen I/III, fibronectin).\",\n      \"method\": \"Recombinant SLIT1 protein treatment of normal human fibroblasts; Western blot for phospho-SMAD/non-SMAD pathways; migration assay; proliferation assay\",\n      \"journal\": \"Medicina\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, in vitro only with recombinant protein, no receptor identification\",\n      \"pmids\": [\"39768930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SLIT1 inhibits ovarian follicle development by inducing granulosa cell apoptosis and antagonizing gonadotropin (FSH and LH)-induced AKT and FOXO1 phosphorylation; Slit1-null female mice show increased ovulation rates due to more healthy antral follicles.\",\n      \"method\": \"Slit1-null mouse model; exogenous SLIT1 treatment of cultured granulosa cells; AKT/FOXO1 phosphorylation assays; apoptosis assay\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype validated with in vitro signaling assays, multiple orthogonal methods\",\n      \"pmids\": [\"38943353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLIT1 (and SLIT2 redundantly) antagonizes FSH-induced FOXO1 phosphorylation in granulosa cells; ROBO1 is not the sole receptor mediating this AKT/FOXO1 antagonism; SLIT1 regulates 612 upregulated and 601 downregulated genes in granulosa cells including metabolic, reproductive and developmental processes.\",\n      \"method\": \"RNA-seq of SLIT1-treated granulosa cells; SLIT1/SLIT2/SLIT3 comparative treatments; Robo1 knockout cells; AKT/FOXO1 phosphorylation assays\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (RNA-seq, KO, signaling assays), single lab\",\n      \"pmids\": [\"40996529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Neuronal Slit1 protects against hypoxia-induced hypomyelination by directly targeting oligodendrocytes through Robo2-srGAP1-RhoA signaling; conditional ablation of Slit1 in neurons (but not globally) exacerbates hypoxic white matter injury; pharmacological RhoA inhibition restores myelination.\",\n      \"method\": \"Conditional (neuron-specific) Slit1 knockout; hypoxia model in mice; Robo2-srGAP1-RhoA pathway dissection; pharmacological RhoA inhibition\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular phenotype + pathway placement (Robo2-srGAP1-RhoA) + pharmacological rescue\",\n      \"pmids\": [\"40117292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Lhx2/9 acts as an indirect transcriptional repressor of slit1 and sema3a expression in the Xenopus forebrain, while Etv1 acts as a transcriptional activator; both are proposed downstream effectors of Fgf signaling that define the boundaries of slit1 expression.\",\n      \"method\": \"Gain-of-function (Lhx2, Lhx2-VP16, Lhx2-En, Etv1) in Xenopus forebrain; slit1 promoter luciferase assays in vitro; mRNA expression analysis\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — in vitro promoter assay + in vivo overexpression, no loss-of-function for transcription factors, single lab\",\n      \"pmids\": [\"32200077\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLIT1 is a secreted glycoprotein that signals through Robo receptors (primarily Robo1 and Robo2) to mediate repulsive axon guidance, neuronal migration, and cell positioning in the developing nervous system; it cooperates redundantly with SLIT2 to repel retinal and olfactory axons away from the midline, directs pioneer myoblast migration via Robo2-RhoA signaling, controls trigeminal gangliogenesis through neural crest–placode Robo2 interactions (modulating N-cadherin surface levels post-translationally), promotes DRG neurite outgrowth through Robo2, regulates adult SVZ precursor migration and oligodendrocyte renewal after demyelination, protects against hypoxia-induced hypomyelination via Robo2-srGAP1-RhoA, antagonizes gonadotropin-induced AKT/FOXO1 signaling in ovarian granulosa cells to promote atresia, and displays a sex-specific role in suppressing stress-induced synaptic and transcriptional changes in the female prefrontal cortex; its transcription is regulated upstream by FGFR1 signaling, Irx4, Etv1/Lhx2, and by SUV39H2-mediated H3K9me3 at its promoter.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify papers first, then extract discoveries only from KEEP papers.\n\n**Classification notes:**\n- KEEP: Papers about canonical SLIT1 protein function\n- EXCLUDE: Papers about SLIT2, SLIT3, SLIT3-only studies, circ_SLIT3 (alt-locus product), GWAS/expression-only, or unrelated genes\n\nPapers about SLIT1 specifically (KEEP): 1, 5, 8, 11, 12, 16, 19, 23, 30, 32 (partial), 33, 39, 43, 44, 52, 53, 59, 65, 70, 73, 74, 76, 77, 81, 88, 90, 93, 95, 97 + gene2pubmed: 9, 11, 15, 18, 20, 22, 25, 30\n\nPapers about SLIT3 only (EXCLUDE): 2, 3, 6, 7, 9, 13, 14, 15, 17, 18, 20, 21, 22, 24, 25, 27, 28, 29, 31, 35, 36, 37, 38, 40, 41, 42, 45, 46, 47, 48, 49, 50, 51, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 66, 67 (SLIT1+2 only, not SLIT1 canonical discovery), 68, 69, 71, 72, 78, 79, 80, 82, 83, 84, 85, 86, 87, 92, 94, 96, 98, 99, 100\n- Paper 34: circ_SLIT3 — EXCLUDE (alt-locus product)\n- gene2pubmed papers 1,2,3,4,5,6,7,13,14,16,17,19,21,23,24,26,27,28,29: EXCLUDE (not mechanistic SLIT1)\n\nNow extracting from KEEP papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Mammalian SLIT1 (and SLIT2, SLIT3) were cloned as vertebrate homologs of Drosophila slit, encoding secreted proteins with leucine-rich repeat (LRR) and EGF-like domains. Northern blot analysis showed SLIT1 mRNA is exclusively expressed in the brain, and in situ hybridization confirmed rat Slit1 is specifically expressed in neurons of fetal and adult forebrains, suggesting a conserved role in nervous system formation.\",\n      \"method\": \"cDNA cloning, Northern blot, in situ hybridization\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning with expression characterization, moderate methods, single lab\",\n      \"pmids\": [\"9813312\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SLIT1 and SLIT2 were identified as large secreted proteins with multiple EGF-like motifs and LRR domains. Both genes are expressed during CNS development in the floor plate, roof plate, and developing motor neurons, paralleling Drosophila slit midline glial expression and implying conserved function in vertebrate midline axon guidance.\",\n      \"method\": \"cDNA cloning, in situ hybridization, protein domain analysis\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original cloning with expression pattern, single lab, moderate methods\",\n      \"pmids\": [\"10349621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Slit1 and Slit2 cooperate in vivo to repel retinal ganglion cell (RGC) axons and define the site of optic chiasm formation. Mice deficient in both Slit1 and Slit2 (but not single mutants) develop an ectopic anterior chiasm, with retinal axons projecting into the contralateral optic nerve and extending dorsally and laterally, demonstrating that Slit proteins establish a repulsive corridor channeling axons to the correct chiasm position.\",\n      \"method\": \"Genetic knockout (Slit1-/-, Slit2-/-, double mutant mice), anterograde axon tracing\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic loss-of-function with specific in vivo phenotypic readout, highly cited, replicated by independent studies\",\n      \"pmids\": [\"11804570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Slit1 and Slit2 together act as the septal chemorepellent controlling lateral olfactory tract (LOT) development. Explant co-culture with septum from Slit1/Slit2 double-deficient mice progressively abolished septal repulsive activity for olfactory bulb axons in a gene dose-dependent manner. In vivo anterograde tracing showed LOT is completely disorganized only in double-deficient embryos, with axons reaching the midline and entering the septum.\",\n      \"method\": \"Genetic knockout, in vitro explant co-culture repulsion assay, anterograde axon tracing in vivo\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro functional assay plus in vivo genetic epistasis, multiple methods, single lab\",\n      \"pmids\": [\"12097499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Slit1 and Slit2 are expressed in the rat CNS with highly dynamic, largely complementary patterns relative to their Robo receptors from embryonic to adult stages. Postnatally, slit and robo expression is up-regulated in most brain regions, suggesting roles beyond axon pathfinding and in adult brain function.\",\n      \"method\": \"In situ hybridization (spatiotemporal expression mapping)\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression characterization only, no functional manipulation\",\n      \"pmids\": [\"11754167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Genomic structure analysis showed SLIT1 is encoded by 37 exons covering at least 183 kb of human genomic DNA. EST database analysis revealed no additional Slit family members in mouse or human. Alternative splicing potential was identified through modular exon-intron organization, and mammalian SLIT1 promoters contain conserved double TCF/LEF and bHLH-binding sites, identifying SLIT1 as an evolutionarily conserved target of the WNT/β-catenin signaling pathway.\",\n      \"method\": \"Long-distance PCR, in silico genomic mapping, EST database analysis, comparative genomics\",\n      \"journal\": \"The International journal of developmental biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/genomic analysis, no functional validation of WNT regulation\",\n      \"pmids\": [\"12141424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Slit1 and Slit2 are not required for tangential migration of cortical interneurons from the basal telencephalon to the cortex, but are required for proper positioning of cholinergic neurons of the basal magnocellular complex. In vitro experiments with Slit1/Slit2 double-deficient mice showed the basal telencephalon repulsive activity for tangentially migrating cells is maintained, indicating other factors account for this repulsion, while Slit1/Slit2 regulate cell positioning near the midline.\",\n      \"method\": \"Genetic knockout (Slit1-/-, Slit2-/-, triple Slit1/Slit2/netrin1 mutants), in vitro repulsion assay, in vivo cell migration analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple mutant combinations plus in vitro validation, defines pathway specificity\",\n      \"pmids\": [\"12642493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The homeobox transcription factor Irx4 is a crucial regulator of Slit1 expression in the chicken retina. Overexpression of Irx4 specifically downregulated Slit1 expression, while inhibition of Irx4 by a dominant-negative mutant induced Slit1 expression. Functional assays showed that Slit1 acts positively to guide retinal axons inside the optic fiber layer, providing intermediate targets during their growth within the retina.\",\n      \"method\": \"Gain-of-function overexpression, dominant-negative inhibition, in vivo retinal axon guidance assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal manipulations (gain/loss of Irx4 function) with mechanistic link to Slit1 expression and axon behavior, single lab\",\n      \"pmids\": [\"12571096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Two divergent zebrafish slit1 orthologs, slit1a and slit1b, were cloned. Both predicted proteins contain conserved LRR and EGF motifs. slit1a is broadly expressed in the CNS, somites, and fin buds; slit1b is restricted to the olfactory system and retina. Both are expressed at the midline, suggesting conserved axon guidance roles, while divergent expression patterns imply distinct functions.\",\n      \"method\": \"cDNA cloning, in situ hybridization (zebrafish embryos)\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression characterization of orthologs, no functional manipulation\",\n      \"pmids\": [\"14579375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A novel alternative splice product of Slit1, designated Slit1alpha, was identified with highest expression in rat hippocampus and cerebral cortex. Slit1alpha arises through alternative splicing at the C-terminus causing a defect in the cysteine knot domain. In vitro assays demonstrated that Slit1alpha acts as a chemorepellent for olfactory bulb axon guidance, indicating it is a biologically active isoform specific to the vertebrate nervous system.\",\n      \"method\": \"RT-PCR, in situ hybridization, in vitro olfactory bulb chemorepulsion assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional in vitro assay demonstrating chemorepellent activity of the isoform, single lab\",\n      \"pmids\": [\"15632296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SLIT1 promoter CpG islands are hypermethylated in glioma tumor cell lines (5 out of 6; 83%), with much lower frequency in primary glioma tumors (2 out of 20; 10%), demonstrating that epigenetic silencing via promoter hypermethylation contributes to SLIT1 transcriptional downregulation in brain tumors.\",\n      \"method\": \"Bisulfite sequencing, methylation analysis, RT-PCR, 5-aza-2'-deoxycytidine re-expression assay\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct bisulfite sequencing of methylation plus pharmacological demethylation rescue of expression, single lab\",\n      \"pmids\": [\"15534609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Slit1 and Slit2 proteins are selective inhibitors and repellents for dorsally projecting cranial motor axons in the hindbrain, but not for ventrally projecting motor axons. Analysis of Slit/Robo-deficient mice showed cranial motor axons aberrantly enter the midline; ectopic Slit1 expression in chick caused specific motor axon projection errors; and dominant-negative Robo expression in chick motoneurons caused axons to enter the midline or fail to exit the hindbrain.\",\n      \"method\": \"In vitro explant repulsion assay, genetic knockout analysis, ectopic overexpression in chick, dominant-negative Robo in vivo\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods across species (mouse KO, chick gain-of-function, dominant-negative) with defined cellular phenotype\",\n      \"pmids\": [\"16162649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Slit1 and its receptor Robo2 are dynamically upregulated in adult rat dorsal root ganglion (DRG) after peripheral nerve injury (sciatic transection) but not after central axon injury (dorsal rhizotomy). Slit1 protein is expressed in satellite cells surrounding primary sensory neurons and accumulates in traumatic neuroma after axotomy, suggesting a role in peripheral nerve regeneration that is injury type-specific.\",\n      \"method\": \"In situ hybridization, immunohistochemistry, western blot, DRG axotomy model\",\n      \"journal\": \"Neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple detection methods with injury-specific expression changes and cellular localization, single lab\",\n      \"pmids\": [\"16979769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Slit1 is required for zonal segregation of olfactory sensory neuron (OSN) axons along the dorsoventral axis of the olfactory bulb. In slit-1-/- mice, a subset of OSN axons that normally project to the dorsal olfactory bulb mistarget and form glomeruli in the ventral region. Robo-2 is expressed in OSNs in a high dorsomedial to low ventrolateral gradient, and Slit-1 and Slit-3 are expressed in the ventral olfactory bulb, defining a repulsive mechanism for dorsoventral OSN targeting.\",\n      \"method\": \"Genetic knockout (slit-1-/-, robo-2-/-), axon tracing, in situ hybridization\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic loss-of-function with specific in vivo targeting phenotype, receptor expression gradient characterized\",\n      \"pmids\": [\"17715346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Robo2-Slit1 signaling mediates reciprocal cell-cell interactions between neural crest cells (which express Slit1) and placode cells (which express Robo2) required for trigeminal ganglion assembly in chick. Blocking Robo2 function or depleting either Robo2 or Slit1 by RNAi disrupted ganglion formation, mimicking neural crest ablation, establishing a novel role for Slit1 as a neural crest-derived ligand in cranial gangliogenesis.\",\n      \"method\": \"RNAi knockdown (Robo2 and Slit1), function-blocking antibodies, neural crest ablation, in ovo perturbation\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal loss-of-function experiments with specific cellular phenotype, multiple orthogonal approaches, published in high-impact journal\",\n      \"pmids\": [\"18278043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"N-cadherin acts in concert with Slit1-Robo2 signaling to mediate placodal cell adhesion during trigeminal gangliogenesis. Slit1-Robo2 signaling modulates N-cadherin protein levels on the placodal cell surface post-translationally (without changing total mRNA or protein). Co-expression of N-cadherin with dominant-negative Robo rescued the Robo2 loss-of-function phenotype, while N-cadherin loss reversed aberrant aggregation induced by increased Slit-Robo signaling.\",\n      \"method\": \"RNAi knockdown, dominant-negative receptor, overexpression, in ovo perturbation, epistasis analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple orthogonal manipulations establishing post-translational mechanism and pathway hierarchy\",\n      \"pmids\": [\"19934013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Recombinant soluble Slit1 protein promotes neurite outgrowth and elongation in adult rat dorsal root ganglion (DRG) neurons in vitro via binding to the Robo2 receptor. A recombinant human Robo2/Fc chimera competed with endogenous Robo2, inhibiting neurite outgrowth, and pre-treatment with Robo2/Fc chimera blocked Slit1-induced neurite growth, establishing Slit1-Robo2 as a signaling axis that promotes peripheral nerve regeneration.\",\n      \"method\": \"In vitro neurite outgrowth assay, recombinant protein treatment, competitive receptor blocking with Robo2/Fc chimera\",\n      \"journal\": \"Journal of chemical neuroanatomy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — receptor-ligand blocking experiment plus functional readout, single lab\",\n      \"pmids\": [\"20172023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SLIT1 mRNA is enriched in the prefrontal cortex of Old World monkeys compared to primary sensory areas. This area-specific enrichment emerges postnatally: SLIT1 is broadly expressed perinatally, then progressively downregulated in early sensory areas around postnatal day 60, followed by association areas, resulting in relative enrichment in prefrontal cortex. Robo1 and Robo2 are more uniformly distributed, suggesting SLIT1 has a specific postnatal role in prefrontal connectivity.\",\n      \"method\": \"Restriction landmark cDNA scanning, in situ hybridization (developmental time series in Old World monkeys)\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — expression characterization without functional manipulation, single species\",\n      \"pmids\": [\"20123755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sclerotome-derived Slit1 drives directional migration and fiber differentiation of Robo2-expressing pioneer myoblasts in avian embryos. Loss of Robo2 or sclerotome-derived Slit1 function perturbed directional cell migration and myofiber formation without affecting myoblast specification, and these effects were mediated through RhoA. Pioneer myoblasts express Robo2 downstream of MyoD and Myf5, and Slit1 is expressed in dermomyotome and caudal sclerotome.\",\n      \"method\": \"In ovo somite inversion, loss-of-function perturbations, expression analysis, RhoA pathway analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cellular phenotype and downstream pathway (RhoA) identified, single lab\",\n      \"pmids\": [\"21653616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The SH2/SH3 adaptor protein Nck2 (but not Nck1) binds to Robo receptors via an atypical SH3-mediated mechanism and is specifically required for Slit1-induced changes in cortical neuron morphology in vitro. Slit1 stimulates cortical dendrite branching and promotes axon elongation; neurons from Robo1/Robo2-deficient mice do not show Slit1-induced neurite growth, establishing Robo as the mediator. Nck2 knockdown selectively abrogates Slit1-driven morphological changes, linking Robo to cytoskeletal rearrangement.\",\n      \"method\": \"Co-immunoprecipitation (SH3-mediated Nck-Robo binding), RNAi knockdown of Nck1/Nck2, Robo1/2 knockout neurons, in vitro morphology assays\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — Co-IP identifying binding partner, combined with genetic loss-of-function and specific morphological readout, defines adaptor-mediated signaling mechanism\",\n      \"pmids\": [\"21600986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Steerable-filter quantitative analysis of optic chiasm axons in Slit1-/-, Slit2-/-, and double mutant mice revealed that Slit2 alone can act to control aspects of retinal axon routing across the ventral diencephalon midline. Slit1 single mutants showed very few axon defects, while Slit2 single mutants showed previously unreported misorientation and anterior shift of chiasm axons, confirming cooperative but distinct roles for the two proteins.\",\n      \"method\": \"Steerable-filter image analysis of labeled axon populations, genetic knockout (single and double mutants)\",\n      \"journal\": \"BMC neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — quantitative analysis across multiple genotypes with defined axon phenotypes, single lab\",\n      \"pmids\": [\"23320558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"At subrepellent (subthreshold) doses, Slit1 acts as a potent promoter of Netrin-1 chemotactic responses rather than as a repellent. On rostral thalamic axons, only a subthreshold concentration of Slit1 enabled an attractive response to a Netrin-1 gradient; on hippocampal neurons, subthreshold Slit1 triggered either attractive or repulsive responses to Netrin-1 depending on substrate. This combinatorial activity was demonstrated using a microfluidic gradient device with both dissociated neurons and explant cultures.\",\n      \"method\": \"Microfluidic gradient device, dissociated neuron cultures and explant cultures, quantitative axon turning assays\",\n      \"journal\": \"Neural development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — innovative quantitative method with multiple cell types and substrates, reveals unexpected combinatorial guidance mechanism\",\n      \"pmids\": [\"25888985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Fibroblast growth factor receptor 1 (Fgfr1) signaling transcriptionally regulates slit1 expression in a cell-autonomous manner. A 2.3 kb Fgfr1-responsive slit1 promoter sequence was identified that recapitulates endogenous spatiotemporal expression in the neural tube and eye of Xenopus embryos. Signaling through Fgfr1 (but not other Fgfr subtypes, even when co-expressed) specifically controls slit1 forebrain expression both in vitro and in vivo.\",\n      \"method\": \"Reporter gene assay (promoter-GFP in Xenopus), in vitro promoter activity in A6 cells, Fgfr subtype-specific manipulation, in vivo Xenopus forebrain expression analysis\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary approaches (in vitro and in vivo) identifying specific upstream regulator of slit1 transcription, single lab\",\n      \"pmids\": [\"29705951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SUV39H2, a histone H3 lysine 9 methyltransferase, directly binds the SLIT1 promoter and suppresses SLIT1 transcription by catalyzing H3K9 tri-methylation. SUV39H2 knockdown relieved SLIT1 repression, and rescue assays showed SLIT1 antagonizes SUV39H2-driven colorectal cancer proliferation and metastasis, establishing SLIT1 as a direct epigenetic target of SUV39H2.\",\n      \"method\": \"ChIP (SUV39H2 binding to SLIT1 promoter), H3K9me3 ChIP, siRNA knockdown, rescue overexpression, in vitro and in vivo cancer assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct ChIP evidence for promoter binding and H3K9me3 mark, combined with functional rescue, identifies specific epigenetic writer-target relationship\",\n      \"pmids\": [\"29458143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATP-P2X7 receptor signaling in satellite glial cells (SGCs) regulates Slit1 expression in dorsal root ganglia after peripheral nerve injury. After sciatic nerve crush, Slit1 expression increases first in neurons then with a time lag in surrounding SGCs, induced by contact with adjacent neuronal somas. Inhibition of P2X7 receptor with BBG reduced Slit1 expression in SGCs and increased VNUT (vesicular nucleotide transporter) in neurons, identifying the ATP-P2X7R pathway as a signal transduction mechanism from injured neurons to SGCs that drives Slit1 upregulation.\",\n      \"method\": \"Immunohistochemistry, western blot, fluorescent gold retrograde tracing, double immunofluorescence, P2X7R inhibitor injection in vivo\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods identifying upstream signaling pathway for Slit1 regulation in SGCs with pharmacological intervention, single lab\",\n      \"pmids\": [\"31607866\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Slit1 protein regulates the mobilization of SVZ-derived neural precursor cells (NPCs) after CNS demyelination. In Slit1-/- mice, the number of SVZ-NPCs recruited to demyelinating corpus callosum lesions is increased, leading to higher numbers of Olig2+ cells within the lesion. Time-lapse video-microscopy showed Slit1-deficient NPCs migrate faster and make more frequent directional changes than controls, supporting a cell-autonomous mechanism. Slits and Robos are also transcriptionally regulated in the SVZ in response to demyelination.\",\n      \"method\": \"Slit1 knockout mice, lysolecithin-induced demyelination model, SVZ microdissection, RT-PCR, time-lapse video-microscopy of immunopurified NPCs, immunohistochemistry\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with specific cellular phenotype, cell-autonomous mechanism confirmed by live imaging, multiple methods\",\n      \"pmids\": [\"32670024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Lhx2 functions as an indirect repressor of slit1 expression in the Xenopus forebrain: Lhx2 overexpression downregulates slit1 mRNA and decreases slit1 promoter activity in vitro; the constitutive repressor fusion Lhx2-En increases slit1 induction. Conversely, Etv1 gain-of-function transactivates slit1 both in vitro and in the forebrain. Together, Lhx2/9 and Etv1 act as complementary downstream effectors of Fgf signaling to establish proper slit1 expression boundaries.\",\n      \"method\": \"Promoter-reporter assay, gain-of-function overexpression, constitutive activator/repressor fusion constructs, in vivo Xenopus forebrain expression analysis\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple complementary transcription factor manipulations with both in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"32200077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SLIT1 is downregulated specifically in the ventromedial prefrontal cortex (vmPFC) of women (but not men) with depression. Knockdown of Slit1 in vmPFC of female mice combined with stress induced sex-specific increases in anxiety- and depression-related behaviors, decreased dendritic arborization of pyramidal neurons, and decreased neuronal excitability—effects not observed in males. RNA sequencing after Slit1 knockdown revealed an augmented transcriptional stress signature in females.\",\n      \"method\": \"Viral-mediated Slit1 knockdown in vmPFC, chronic variable stress, behavioral testing, electrophysiology, dendritic morphology analysis, RNA sequencing\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — targeted loss-of-function in specific brain region with multiple orthogonal readouts (behavior, electrophysiology, morphology, transcriptomics), defines sex-specific mechanism\",\n      \"pmids\": [\"33896623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-640 targets SLIT1 and the miR-640-SLIT1 axis regulates radiosensitivity of glioma cells through the Wnt/β-catenin signaling pathway. SLIT1 knockdown reduced radioresistance, migration, and invasion while increasing apoptosis. Loss of miR-640 activity upregulated SLIT1, Wnt, and β-catenin protein expression and inhibited p-GSK-3β, suggesting SLIT1 activates Wnt/β-catenin signaling to promote glioma radioresistance.\",\n      \"method\": \"siRNA knockdown, miRNA inhibitor transfection, western blot, CCK-8 proliferation assay, wound healing, transwell invasion, caspase-3 assay\",\n      \"journal\": \"British journal of biomedical science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional assays with pathway analysis, single lab, limited mechanistic depth\",\n      \"pmids\": [\"35996510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Slit1 inhibits ovarian follicle development and female fertility in mice via an autocrine/paracrine mechanism. Slit1-null female mice produce larger litters due to increased ovulation rates and greater numbers of healthy antral follicles. Exogenous SLIT1 induces granulosa cell apoptosis and inhibits gonadotropin-stimulated AKT phosphorylation. SLIT1 pretreatment of cultured granulosa cells inhibited both FSH- and LH-induced AKT phosphorylation, identifying SLIT1 as a novel antagonist of gonadotropin-AKT signaling in the ovary.\",\n      \"method\": \"Slit1 knockout mice, granulosa cell culture, exogenous recombinant SLIT1 treatment, AKT phosphorylation assays, apoptosis assays, follicle counting, ovulation rate measurement\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function plus in vitro mechanistic dissection with specific signaling readout (AKT phosphorylation), multiple orthogonal methods\",\n      \"pmids\": [\"38943353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Slit1 promotes hypertrophic scar (HTS) formation through TGF-β signaling. Recombinant Slit1 treatment of normal human fibroblasts promoted cell proliferation, differentiation (increased α-SMA, collagen I/III, fibronectin), migration (with increased N-cadherin and vimentin, decreased E-cadherin), and activated both SMAD pathway proteins (SMAD2, SMAD3, SMAD1/5/8) and non-SMAD pathway proteins (TAK1, JNK1, ERK1/2, p38).\",\n      \"method\": \"Recombinant human Slit1 protein treatment, western blot, RT-qPCR, cell viability assay, scratch migration assay, phospho-protein analysis\",\n      \"journal\": \"Medicina (Kaunas, Lithuania)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple signaling readouts with recombinant protein, single lab, no genetic loss-of-function validation\",\n      \"pmids\": [\"39768930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Neuronal Slit1 secreted from hypoxic neurons directly targets oligodendrocyte precursor cells (OPCs) via Robo2-srGAP1-RhoA signaling to promote oligodendrocyte differentiation and myelination. Conditional ablation of Slit1 in neurons exacerbated hypoxia-induced hypomyelination and motor/cognitive deficits. Pharmacological RhoA inhibition restored myelination in adolescent mice. A natural variant with higher Slit1 expression was identified in Tibetan populations adapted to low oxygen, validating the pathway's physiological importance.\",\n      \"method\": \"Conditional neuron-specific Slit1 knockout, chronic hypoxia mouse model, pharmacological RhoA inhibition, behavioral testing, pathway analysis (Robo2-srGAP1-RhoA), natural selection/population genetics analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific conditional knockout with defined downstream signaling pathway (Robo2-srGAP1-RhoA), pharmacological rescue, and evolutionary validation\",\n      \"pmids\": [\"40117292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLIT1 and SLIT2 share redundant functions and mechanisms of action in ovarian granulosa cells. RNA-seq showed SLIT1 upregulated 612 and downregulated 601 genes in granulosa cells. SLIT1 antagonizes FSH- (but not LH-) induced FOXO1 phosphorylation; SLIT2 (but not SLIT3) similarly antagonizes FSH-stimulated AKT and FOXO1 signaling. Both SLIT1 and SLIT2 induce granulosa cell apoptosis. Loss of ROBO1 did not inhibit SLIT1 or SLIT2 AKT/FOXO1 antagonism, indicating ROBO1 is not the sole receptor.\",\n      \"method\": \"RNA-seq, exogenous recombinant SLIT1/2/3 treatment, AKT and FOXO1 phosphorylation assays, Robo1 knockout granulosa cells, apoptosis assays\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — RNA-seq combined with defined signaling pathway analysis (AKT/FOXO1), receptor knockout validation, multiple ligand comparisons, establishes specificity\",\n      \"pmids\": [\"40996529\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLIT1 is a secreted glycoprotein with LRR and EGF-like domains that acts as a repulsive axon guidance cue through Robo receptors (primarily Robo2), cooperating with SLIT2 to channel retinal axons at the optic chiasm, organize olfactory tract and olfactory bulb zonal targeting, and guide motor axons in the hindbrain; beyond axon guidance, SLIT1 regulates neural crest-placode interactions during trigeminal gangliogenesis via Robo2 (modulating N-cadherin surface levels post-translationally), promotes peripheral nerve regeneration and SVZ-derived precursor migration, drives pioneer myoblast directional migration through RhoA downstream of Robo2, promotes oligodendrocyte differentiation under hypoxia via Robo2-srGAP1-RhoA, enables combinatorial guidance by potentiating Netrin-1 responses at subthreshold concentrations, inhibits ovarian follicle development by antagonizing gonadotropin-AKT/FOXO1 signaling, and modulates stress-induced neurophysiology in the female vmPFC; its transcription is controlled by Fgfr1 signaling (through Etv1/Lhx2), Irx4, and is silenced by SUV39H2-mediated H3K9 tri-methylation and by promoter CpG hypermethylation in tumors.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLIT1 is a secreted glycoprotein that functions as a key ligand for Robo-family receptors to direct axon guidance, neuronal migration, cell positioning, and myelination across multiple developmental and adult contexts. SLIT1 signals through Robo1 and Robo2 to repel retinal ganglion cell and olfactory tract axons from the midline (acting redundantly with SLIT2), segregate olfactory sensory neuron axons along the dorsoventral axis, promote cortical axon elongation via the adaptor Nck2, and direct pioneer myoblast migration via RhoA [PMID:11804570, PMID:12097499, PMID:17715346, PMID:21600986, PMID:21653616]. In cranial gangliogenesis, neural crest–derived SLIT1 signals through placodal Robo2 to modulate N-cadherin surface levels post-translationally, controlling cell adhesion and trigeminal ganglion assembly [PMID:18278043, PMID:19934013]. Beyond the nervous system, SLIT1 inhibits ovarian follicle development by antagonizing gonadotropin-induced AKT/FOXO1 signaling in granulosa cells, and neuronal SLIT1 protects against hypoxia-induced hypomyelination through a Robo2–srGAP1–RhoA pathway targeting oligodendrocytes [PMID:38943353, PMID:40117292].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing that SLIT1 functions redundantly with SLIT2 as a midline-derived chemorepellent resolved how retinal and olfactory axons are channeled away from inappropriate territories during development.\",\n      \"evidence\": \"Slit1/Slit2 single and double knockout mice with anterograde axon tracing showing ectopic optic chiasm and disorganized lateral olfactory tract\",\n      \"pmids\": [\"11804570\", \"12097499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative individual contributions of Slit1 vs Slit2 in each tract not fully separated\", \"Receptor requirements (Robo1 vs Robo2) not addressed in these studies\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining SLIT1's role in neuronal positioning (cholinergic neuron placement in basal telencephalon) while excluding it from cortical interneuron tangential migration clarified the specificity of Slit signaling among different migratory populations.\",\n      \"evidence\": \"Slit1/Slit2 double and Slit1/Slit2/Netrin-1 triple knockout mice with in vivo and in vitro migration analysis\",\n      \"pmids\": [\"12642493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the remaining repulsive cue driving interneuron migration is unknown\", \"Cell-autonomous vs non-autonomous roles not distinguished\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying Robo2 as the receptor mediating SLIT1-dependent dorsoventral axon sorting in the olfactory bulb linked graded receptor expression to topographic map formation.\",\n      \"evidence\": \"Reciprocal knockout phenotypes in slit1−/− and robo2−/− mice showing mistargeting of dorsal olfactory sensory neuron axons\",\n      \"pmids\": [\"17715346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Slit2/Slit3 also contribute to ventral OB repulsion not resolved\", \"Downstream intracellular signaling in olfactory sensory neurons not characterized\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that neural crest–expressed SLIT1 signals through Robo2 on placodal cells to assemble the trigeminal ganglion revealed a non-canonical (attractive/adhesive) role for SLIT–Robo in tissue condensation rather than repulsion.\",\n      \"evidence\": \"Robo2 blocking antibody and siRNA knockdown of Slit1/Robo2 in chick embryo disrupting ganglion formation\",\n      \"pmids\": [\"18278043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this attractive mechanism operates in other ganglia or tissues is unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showing that SLIT1–Robo2 signaling modulates N-cadherin surface levels post-translationally identified a downstream cell adhesion mechanism through which SLIT1 controls gangliogenesis.\",\n      \"evidence\": \"Dominant-negative Robo, siRNA, and N-cadherin co-expression rescue experiments in chick embryo\",\n      \"pmids\": [\"19934013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking mechanism by which Robo2 regulates N-cadherin surface localization not identified\", \"No biochemical characterization of the N-cadherin endocytic/recycling step\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying Nck2 as a specific intracellular adaptor downstream of Robo1/Robo2 for SLIT1-induced cortical axon elongation and dendrite branching provided a molecular link from receptor activation to cytoskeletal remodeling, while parallel work showed SLIT1–Robo2–RhoA controls myoblast directional migration.\",\n      \"evidence\": \"Robo1;Robo2 double-KO neurons unresponsive to Slit1; Nck2 knockdown abolishing morphological response; Robo2/Slit1 loss-of-function in chick somites with RhoA pathway analysis\",\n      \"pmids\": [\"21600986\", \"21653616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise GEF/GAP linking Nck2 to cytoskeletal effectors in cortical neurons not identified\", \"Whether RhoA activation in myoblasts is direct via srGAP or through another mediator not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying upstream transcriptional regulators of SLIT1—FGFR1 signaling driving slit1 promoter activity, and SUV39H2-mediated H3K9me3 silencing at the SLIT1 promoter in colorectal cancer—established how SLIT1 expression is controlled in normal development and pathologically repressed in cancer.\",\n      \"evidence\": \"Slit1 promoter reporter in Xenopus with FGFR subtype perturbations; ChIP for SUV39H2 and H3K9me3 at SLIT1 promoter with rescue assay in cancer models\",\n      \"pmids\": [\"29705951\", \"29458143\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct transcription factor binding sites within the slit1 promoter responding to FGFR1 signaling not mapped\", \"Whether SUV39H2-mediated silencing occurs outside colorectal cancer contexts unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showing that Slit1 loss cell-autonomously accelerates SVZ precursor migration and enhances oligodendrocyte renewal after demyelination revealed an adult function for SLIT1 in restraining reparative neural precursor mobilization.\",\n      \"evidence\": \"Slit1-null mice in cuprizone demyelination model; time-lapse microscopy of immunopurified NPCs\",\n      \"pmids\": [\"32670024\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating the migration-restraining effect on SVZ-derived NPCs not identified\", \"Whether enhanced oligodendrocyte renewal translates to functional remyelination improvement not tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that SLIT1 knockdown in female vmPFC increases stress susceptibility, reduces dendritic complexity and neuronal excitability, and amplifies the stress transcriptome established a sex-specific neuroprotective role for SLIT1 in the adult prefrontal cortex.\",\n      \"evidence\": \"Viral Slit1 knockdown in mouse vmPFC; chronic variable stress; electrophysiology, morphology, and RNA-seq\",\n      \"pmids\": [\"33896623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating SLIT1's effects in vmPFC neurons not identified\", \"Mechanism underlying sex specificity unexplained\", \"Whether SLIT1 acts on local circuits or cell-autonomously on pyramidal neurons not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying SLIT1 as an inhibitor of ovarian follicle development through antagonism of gonadotropin-induced AKT/FOXO1 phosphorylation in granulosa cells expanded SLIT1's functional repertoire beyond the nervous system to reproductive biology.\",\n      \"evidence\": \"Slit1-null mice showing increased ovulation; exogenous SLIT1 treatment inhibiting AKT/FOXO1 phosphorylation in cultured granulosa cells\",\n      \"pmids\": [\"38943353\", \"40996529\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the receptor mediating AKT/FOXO1 antagonism remains unresolved (ROBO1 knockout does not fully abolish effect)\", \"Whether SLIT1 regulates folliculogenesis through direct paracrine signaling from a defined source cell or systemically is unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Conditional neuron-specific Slit1 ablation exacerbating hypoxic white matter injury, rescued by RhoA inhibition, defined a neuron-to-oligodendrocyte Robo2–srGAP1–RhoA protective signaling axis for myelination.\",\n      \"evidence\": \"Conditional neuronal Slit1 knockout under hypoxia; Robo2–srGAP1–RhoA pathway dissection; pharmacological RhoA inhibition restoring myelination\",\n      \"pmids\": [\"40117292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SLIT1 promotes oligodendrocyte precursor differentiation, survival, or both is not fully resolved\", \"Structural basis of SLIT1–Robo2 interaction in oligodendrocytes not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The receptor identity and downstream signaling cascade mediating SLIT1's functions in several contexts—adult SVZ migration, vmPFC neuroprotection, and granulosa cell AKT antagonism—remain unresolved, and no structural model of the SLIT1–Robo interface exists.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of SLIT1 or SLIT1–Robo complex\", \"Receptor specificity for non-neural SLIT1 functions largely undefined\", \"Whether SLIT1 processing (cleavage) generates functionally distinct fragments in vivo is uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 1, 4, 5, 7, 9, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [17, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 4, 5, 7, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 17, 18, 19]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 4, 9, 14]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [17, 18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ROBO2\",\n      \"ROBO1\",\n      \"NCK2\",\n      \"SRGAP1\",\n      \"RHOA\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SLIT1 is a secreted glycoprotein containing leucine-rich repeat and EGF-like domains that functions as a repulsive axon guidance cue through Robo receptors, with roles extending beyond neural wiring to cell migration, myelination, ovarian physiology, and stress-related neuroplasticity. During development, SLIT1 cooperates with SLIT2 to channel retinal ganglion cell axons at the optic chiasm, organize the lateral olfactory tract, and repel dorsally projecting cranial motor axons, while independently directing olfactory sensory neuron zonal targeting via Robo2 and mediating neural crest–placode interactions during trigeminal gangliogenesis through post-translational modulation of N-cadherin surface levels [PMID:11804570, PMID:12097499, PMID:17715346, PMID:18278043, PMID:19934013]. Beyond axon guidance, SLIT1 promotes oligodendrocyte differentiation under hypoxia through a Robo2–srGAP1–RhoA signaling axis, inhibits ovarian follicle development by antagonizing gonadotropin-stimulated AKT/FOXO1 signaling in granulosa cells, and modulates stress-induced dendritic remodeling and neuronal excitability in the female ventromedial prefrontal cortex [PMID:40117292, PMID:38943353, PMID:33896623]. SLIT1 transcription is positively regulated by Fgfr1 signaling through Etv1 and negatively regulated by Irx4, Lhx2, and SUV39H2-mediated H3K9 trimethylation, and its promoter is subject to CpG hypermethylation-driven silencing in tumors [PMID:29705951, PMID:29458143, PMID:12571096].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Cloning of mammalian SLIT1 established it as a brain-specific secreted protein with conserved LRR and EGF-like domains, providing the molecular foundation for investigating vertebrate axon guidance.\",\n      \"evidence\": \"cDNA cloning, Northern blot, and in situ hybridization in rat and human tissues\",\n      \"pmids\": [\"9813312\", \"10349621\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional assay performed\", \"Receptor identity unknown\", \"No loss-of-function data\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Double-knockout studies revealed that SLIT1 and SLIT2 cooperatively establish repulsive corridors for retinal axons at the optic chiasm and for olfactory bulb axons in the lateral olfactory tract, demonstrating genetic redundancy and defining the first in vivo guidance functions.\",\n      \"evidence\": \"Slit1−/−, Slit2−/−, and double-mutant mice with anterograde axon tracing and explant co-culture repulsion assays\",\n      \"pmids\": [\"11804570\", \"12097499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each Slit ligand to individual guidance decisions unclear\", \"Downstream signaling mediators not identified\", \"Whether Robo1 vs Robo2 mediates these specific responses not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"SLIT1 was shown to selectively repel dorsally projecting cranial motor axons but not ventrally projecting ones, establishing subtype specificity of Slit-Robo guidance in the hindbrain.\",\n      \"evidence\": \"Slit/Robo-deficient mouse analysis, ectopic Slit1 expression in chick, dominant-negative Robo expression in motoneurons\",\n      \"pmids\": [\"16162649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for selectivity between dorsal and ventral motor neuron subtypes unresolved\", \"Identity of Robo subtype(s) mediating this selectivity not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Slit1 knockout mice revealed a specific role for SLIT1 in dorsoventral zonal targeting of olfactory sensory neuron axons, distinguishing its function from the redundant Slit1/Slit2 roles seen in other systems.\",\n      \"evidence\": \"Slit-1−/− and Robo-2−/− mice with axon tracing and expression gradient analysis in the olfactory bulb\",\n      \"pmids\": [\"17715346\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of Slit3 to ventral repulsion not genetically dissected\", \"How Robo2 gradient is established in OSNs unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that neural crest-derived SLIT1 signals through placodal Robo2 to assemble the trigeminal ganglion established a non-canonical role for Slit-Robo in cell–cell adhesive interactions during gangliogenesis.\",\n      \"evidence\": \"RNAi knockdown of Slit1/Robo2, function-blocking antibodies, neural crest ablation in chick embryos\",\n      \"pmids\": [\"18278043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling cascade in placodal cells not fully elucidated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Epistasis experiments showed SLIT1-Robo2 signaling modulates N-cadherin surface levels post-translationally in placode cells, providing the first mechanistic link between Slit-Robo and adhesion molecule trafficking.\",\n      \"evidence\": \"RNAi, dominant-negative Robo, N-cadherin co-expression rescue, in ovo perturbation with epistasis analysis\",\n      \"pmids\": [\"19934013\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking mechanism (endocytosis vs exocytosis of N-cadherin) not defined\", \"Whether this mechanism operates in other Slit-Robo contexts unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of the adaptor Nck2 as a Robo-binding partner specifically required for Slit1-induced cortical neurite morphology changes linked the receptor to cytoskeletal remodeling, and parallel work showed Slit1-Robo2-RhoA drives pioneer myoblast migration.\",\n      \"evidence\": \"Co-immunoprecipitation of Nck2-Robo, Nck2 RNAi in Robo1/2 KO cortical neurons; in ovo somite manipulations with RhoA pathway analysis for myoblast migration\",\n      \"pmids\": [\"21600986\", \"21653616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Nck2 and RhoA operate in the same or parallel downstream branches unresolved\", \"Structural basis of Nck2-Robo interaction not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Subthreshold concentrations of Slit1 were found to potentiate Netrin-1 chemotactic responses rather than simply repelling axons, revealing an unexpected combinatorial guidance code.\",\n      \"evidence\": \"Microfluidic gradient device with quantitative axon turning assays on rostral thalamic and hippocampal neurons\",\n      \"pmids\": [\"25888985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of Slit-Netrin crosstalk at the receptor level not identified\", \"Whether this combinatorial activity operates in vivo not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"SLIT1 transcription was shown to be under dual epigenetic and signaling control: Fgfr1-Etv1 activates the slit1 promoter in the forebrain, while SUV39H2-mediated H3K9me3 silences SLIT1 in colorectal cancer, identifying upstream regulatory nodes.\",\n      \"evidence\": \"Promoter-reporter assays in Xenopus and cell lines for Fgfr1/Etv1; ChIP for SUV39H2 binding and H3K9me3 at SLIT1 promoter with siRNA rescue in cancer cells\",\n      \"pmids\": [\"29705951\", \"29458143\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Fgfr1-Etv1 regulation is conserved in mammals not confirmed\", \"Identity of chromatin readers downstream of H3K9me3 at SLIT1 locus unknown\", \"Fgfr1 study in Xenopus only\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Targeted Slit1 knockdown in female mouse vmPFC combined with stress produced depression-related behaviors, reduced dendritic arborization, and decreased neuronal excitability, establishing SLIT1 as a sex-specific modulator of stress vulnerability in the adult brain.\",\n      \"evidence\": \"Viral-mediated vmPFC Slit1 knockdown, chronic variable stress, behavioral testing, electrophysiology, dendritic morphology, RNA-seq\",\n      \"pmids\": [\"33896623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream receptor and signaling pathway in vmPFC neurons not identified\", \"Whether SLIT1 acts cell-autonomously or through paracrine signaling in vmPFC not resolved\", \"Basis of sex specificity unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SLIT1 was identified as an inhibitor of ovarian follicle development that antagonizes gonadotropin-stimulated AKT phosphorylation in granulosa cells, extending SLIT1 function to reproductive physiology.\",\n      \"evidence\": \"Slit1 knockout mice with increased ovulation and fertility, recombinant SLIT1 treatment of granulosa cells with AKT phosphorylation and apoptosis assays\",\n      \"pmids\": [\"38943353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the SLIT1 receptor on granulosa cells not established (ROBO1 knockout did not abolish signaling)\", \"Mechanism of AKT antagonism not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Neuron-derived SLIT1 was shown to promote oligodendrocyte differentiation under hypoxia via a Robo2–srGAP1–RhoA pathway, with pharmacological RhoA inhibition rescuing myelination deficits, and a human population genetics link to high-altitude adaptation was identified.\",\n      \"evidence\": \"Conditional neuron-specific Slit1 knockout in chronic hypoxia model, RhoA inhibitor rescue, behavioral testing, Tibetan population variant analysis\",\n      \"pmids\": [\"40117292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How hypoxia regulates neuronal SLIT1 secretion not defined\", \"Whether srGAP1 is the sole RhoGAP mediating this response not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"RNA-seq and receptor-knockout analysis in granulosa cells demonstrated that SLIT1 and SLIT2 share redundant antagonism of FSH-AKT/FOXO1 signaling and that ROBO1 is not the sole mediating receptor, narrowing the receptor identity question.\",\n      \"evidence\": \"RNA-seq of SLIT1-treated granulosa cells, recombinant SLIT1/2/3 comparative treatment, Robo1 knockout granulosa cells, AKT/FOXO1 phosphorylation assays\",\n      \"pmids\": [\"40996529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the non-ROBO1 receptor for SLIT1 in granulosa cells remains unknown\", \"In vivo genetic validation of SLIT2 redundancy in fertility not yet performed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the SLIT1 receptor in non-neuronal tissues (granulosa cells, fibroblasts), the structural basis of concentration-dependent switching between repulsion and Netrin-1 potentiation, and the mechanism underlying sex-specific SLIT1 effects in the adult prefrontal cortex remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of SLIT1-Robo2 complex available\", \"Concentration-dependent signaling switch mechanism not defined at molecular level\", \"Sex-specific chromatin or hormonal regulation of SLIT1 in brain not characterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [2, 3, 11, 13, 14, 16, 21, 29, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [21, 29, 32]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [0, 1, 2, 3, 14, 16, 29, 31]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 3, 7, 11, 13, 14, 15, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [2, 3, 11, 13, 19, 21, 25, 27, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15, 19, 29, 31, 32]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [29, 32]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [29, 32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ROBO2\",\n      \"ROBO1\",\n      \"NCK2\",\n      \"SRGAP1\",\n      \"SLIT2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}