{"gene":"ROBO2","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2004,"finding":"SLIT2/ROBO2 signaling restricts kidney induction to a single site by limiting the domain of GDNF expression in the nephrogenic mesenchyme. Mouse mutants lacking SLIT2 or ROBO2 develop supernumerary ureteric buds with inappropriately maintained anterior Gdnf expression, demonstrating that the SLIT2/ROBO2 signal is transduced in the nephrogenic mesenchyme.","method":"Knockout mouse genetics (Slit2-/- and Robo2-/- mutants), in situ hybridization for Gdnf expression","journal":"Developmental Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype, replicated across two ligand/receptor knockouts with consistent molecular readout","pmids":["15130495"],"is_preprint":false},{"year":2000,"finding":"Drosophila Robo and Robo2 have distinct and complementary roles in midline repulsion; robo,robo2 double mutants phenocopy slit mutants, indicating Robo2 is a functional Slit receptor contributing to midline axon guidance alongside Robo1.","method":"Drosophila genetics (single and double mutant analysis), axon trajectory imaging","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis via double-mutant analysis replicating slit phenotype, foundational Drosophila ortholog study","pmids":["11163264"],"is_preprint":false},{"year":2015,"finding":"SLIT2 acting through ROBO1 and ROBO2 promotes retinal neovascularization by driving endothelial cell migration, and is required for both Slit2- and VEGF-induced Rac1 activation and lamellipodia formation.","method":"Conditional knockout mice deficient in Slit2, Robo1, and Robo2; endothelial cell migration assays; Rac1 activation assays; lamellipodia imaging","journal":"Nature Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined cellular phenotype plus mechanistic downstream signaling (Rac1 activation) using multiple orthogonal methods","pmids":["25894826"],"is_preprint":false},{"year":2007,"finding":"Human ROBO2 disruption by a de novo translocation produces dominant-negative ROBO2 proteins that abrogate SLIT-ROBO signaling in vitro, and heterozygous Robo2 mouse mutants exhibit vesicoureteral reflux with ureterovesical junction defects.","method":"In vitro signaling assay with dominant-negative ROBO2, heterozygous/mosaic Robo2 mouse models, human genetics","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative functional assay in vitro combined with mouse model genetics and human family studies","pmids":["17357069"],"is_preprint":false},{"year":2012,"finding":"ROBO2 forms a complex with nephrin in kidney podocytes through the adaptor protein NCK. Slit2-Robo2 signaling inhibits nephrin-induced actin polymerization, and loss of Robo2 in mice increases F-actin associated with nephrin, altering podocyte foot process structure. Genetic interaction shows Robo2 loss alleviates abnormal podocyte structural phenotype in nephrin null mice.","method":"Co-immunoprecipitation/biochemical pulldown, actin polymerization assay, Robo2 knockout mouse ultrastructure, epistasis analysis in Robo2/nephrin double mutants","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical complex identification plus in vitro functional assay plus in vivo KO phenotype plus genetic epistasis","pmids":["22840396"],"is_preprint":false},{"year":2016,"finding":"SLIT2/ROBO2 signaling inhibits nonmuscle myosin IIA (NMIIA) activity and destabilizes podocyte adhesion via a SRGAP1-dependent pathway. MRLC (myosin II regulatory light chain) interacts directly with SRGAP1 and forms a ROBO2/SRGAP1/NMIIA complex in the presence of SLIT2. SLIT2 stimulation decreases focal adhesion formation and reduces podocyte attachment to collagen. Podocyte-specific Robo2 knockout protects mice from hypertension-induced podocyte detachment and albuminuria.","method":"Co-immunoprecipitation, direct protein interaction assay, focal adhesion assay, podocyte adhesion assay, conditional KO mouse model, in vivo injury studies","journal":"JCI Insight","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct protein interaction plus functional in vitro assays plus conditional KO in vivo with defined phenotypic readouts","pmids":["27882344"],"is_preprint":false},{"year":2015,"finding":"Robo2 acts in trans (non-cell-autonomously) to inhibit Slit-Robo1 repulsion in Drosophila pre-crossing commissural axons. Robo2 expressed in midline cells can bind Robo1 via extracellular domains and rescue robo2-dependent midline crossing defects non-cell-autonomously; the extracellular domains required for Robo1 binding are also required for Robo2's midline-crossing promotion activity.","method":"Drosophila genetics, gain-of-function/rescue assays, extracellular domain binding experiments","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — binding assay plus non-cell-autonomous genetic rescue plus domain deletion analysis with multiple functional readouts","pmids":["26186094"],"is_preprint":false},{"year":2009,"finding":"Slit1-Robo2 signaling is essential for trigeminal ganglion assembly: placode cells express Robo2 and early migrating cranial neural crest cells express Slit1; perturbation of Robo2 function or depletion of Robo2 or Slit1 disrupts ganglion formation, mimicking neural crest ablation.","method":"Chick embryo RNA interference (siRNA), Robo2 function blocking, neural crest ablation, in vivo ganglion imaging","journal":"Nature Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal perturbation of receptor and ligand with consistent phenotype, multiple experimental approaches in vivo","pmids":["18278043"],"is_preprint":false},{"year":2009,"finding":"N-cadherin acts in concert with Slit1-Robo2 signaling during gangliogenesis. Blocking or augmenting Slit-Robo signaling modulates N-cadherin protein expression on the placodal cell surface, suggesting post-translational regulation of N-cadherin by Slit-Robo2; co-expression of N-cadherin with dominant-negative Robo abrogates the Robo2 loss-of-function phenotype.","method":"Chick embryo siRNA knockdown, dominant-negative Robo2, rescue experiments, N-cadherin surface expression assay","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo functional perturbations in a single lab; post-translational mechanism inferred but not directly demonstrated by biochemistry","pmids":["19934013"],"is_preprint":false},{"year":2010,"finding":"Robo1 and Robo2 have distinct specialized roles in post-crossing commissural axon guidance in the mouse spinal cord: Robo2 is required for axons to project away from the floor plate into the lateral funiculus, while Robo1 prevents axonal stalling after crossing. Genetic rescue experiments (Robo3 failure-to-cross rescued largely but not fully by loss of both Robo1 and Robo2) suggest existence of an additional Slit receptor.","method":"Mouse genetics, combination KO mutants (Robo1, Robo2, Robo3 single and double/triple mutants), axon trajectory analysis","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis via multiple combination mutants with specific trajectory readouts distinguishing Robo1 vs Robo2 functions","pmids":["20631173"],"is_preprint":false},{"year":2007,"finding":"Robo2 is required for zonal segregation of olfactory sensory neuron (OSN) axons along the dorsoventral axis of the olfactory bulb. Robo2 is expressed in OSNs in a high dorsomedial to low ventrolateral gradient, and in robo-2-/- mice, a subset of OSN axons normally projecting to the dorsal OB mistarget to the ventral region. Slit1 is expressed in the ventral OB consistent with repulsion of Robo2-expressing dorsal axons.","method":"Robo2 and Slit1 knockout mice, axon targeting analysis, expression mapping","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific axon mistargeting phenotype, consistent ligand/receptor expression patterns","pmids":["17715346"],"is_preprint":false},{"year":2007,"finding":"Slit1a acts through Robo2 to inhibit retinal ganglion cell (RGC) arborization and synaptogenesis in the CNS. Dominant-negative Robo2 expressed in single RGCs phenocopies ast (robo2) mutant increased arborization, and full-length Robo2 rescues it, indicating cell-autonomous action. Genetic analysis shows Slit1a acts partly through Robo2 and partly through Robo2-independent pathways.","method":"Zebrafish astray/robo2 mutants, slit1a morphants, single-cell dominant-negative and rescue experiments, time-lapse imaging of arbor development, YFP-Rab3 synapse labeling","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous rescue with full-length Robo2, single-cell dominant-negative, time-lapse imaging, genetic epistasis","pmids":["17640525"],"is_preprint":false},{"year":2021,"finding":"Robo2 plays a synaptogenic role in hippocampal CA1, acting postsynaptically in pyramidal neurons for formation of excitatory (but not inhibitory) synapses specifically in proximal dendritic compartments. Robo2 synaptogenic activity involves a trans-synaptic interaction with presynaptic Neurexins, as well as binding to its canonical extracellular ligand Slit. Preventing Robo2-dependent excitatory synapse formation alters place cell properties of adult CA1 neurons.","method":"In vivo conditional KO, in vitro trans-synaptic binding assays, 2-photon Ca2+ imaging in behaving mice","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO with compartment-specific synapse phenotype, biochemical binding assay identifying Neurexin interaction, functional circuit readout","pmids":["34686348"],"is_preprint":false},{"year":2019,"finding":"Robo2 regulates synaptic oxytocin content by affecting actin dynamics via a Slit3-Robo2-Cdc42 pathway. Genetic loss of robo2 decreases synaptic OXT levels and reduces mobility of the actin probe Lifeact-EGFP in OXT synapses, slowing vesicle accumulation. OXT-specific dominant-negative Cdc42 expression links Robo2 to local actin dynamics at synapses.","method":"Zebrafish robo2 mutant, live imaging of Lifeact-EGFP and OXT vesicles, dominant-negative Cdc42 expression, cytochalasin-D treatment","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO combined with live imaging, actin probe dynamics, and pathway dissection via dominant-negative effector","pmids":["31180321"],"is_preprint":false},{"year":2015,"finding":"SLIT/ROBO2 signaling promotes mammary stem cell senescence by inhibiting WNT signaling. Absence of SLIT/ROBO2 signaling leads to increased nuclear β-catenin, repressed expression of p16(INK4a), and delayed mammary stem cell senescence, thereby enhancing stem cell renewal.","method":"Robo2 knockout mouse mammary gland analysis, β-catenin nuclear localization, p16(INK4a) expression, stem cell renewal assays","journal":"Stem Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with defined molecular readouts (β-catenin, p16), single lab","pmids":["25241737"],"is_preprint":false},{"year":2018,"finding":"Epithelial ROBO2 loss activates Robo1+ myofibroblasts and induces TGF-β and Wnt pathways, acting non-autonomously as a stroma suppressor gene. In Robo2-deficient pancreatic epithelium (Pdx1Cre;Robo2F/F mice), enhanced myofibroblast activation, collagen crosslinking, and T-cell infiltration were suppressed by the TGF-β inhibitor galunisertib.","method":"Conditional KO (Pdx1Cre;Robo2F/F), cell culture fibroblast activation assays, TGF-β pathway analysis, TGF-β inhibitor rescue","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with pathway identification (TGF-β), pharmacological rescue with pathway inhibitor, multiple cellular readouts","pmids":["30504844"],"is_preprint":false},{"year":2019,"finding":"Robo2 contains a cryptic binding site for NELL1 and NELL2 in its first fibronectin type III (FNIII) domain, occluded in intact Robo2 at neutral pH. NELL1/2 binding to Robo2 is enabled under acidic conditions or when Robo2 undergoes proteolytic digestion or conformational change; specific amino acids in the first FNIII domain critical for NELL1 binding were identified by mutation analysis.","method":"Binding assays (cell surface binding), site-directed mutagenesis of FNIII domain, Robo2 deletion mutants, pH-dependent binding affinity measurements","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro binding reconstitution with mutagenesis identifying specific critical residues, single lab","pmids":["30700556"],"is_preprint":false},{"year":2022,"finding":"The Robo2 ectodomain undergoes a conformational change from an extended hairpin-like structure to a compact form under acidic pH, which attenuates interactions between Ig-like and FNIII domains to unmask the NELL1/2-binding site. Alternative splicing isoforms of Robo2 have distinct NELL1/2-binding affinities correlated with differences in ectodomain conformation.","method":"FRET-based conformational indicators inserted into Robo2 ectodomain, size exclusion chromatography, binding affinity measurements for isoforms","journal":"Journal of Molecular Biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — FRET structural analysis with biochemical validation, single lab","pmids":["35940226"],"is_preprint":false},{"year":2011,"finding":"Sclerotome-derived Slit1 drives directional migration and differentiation of Robo2-expressing pioneer myoblasts. Robo2 is expressed downstream of MyoD and Myf5. Loss of Robo2 or sclerotome-derived Slit1 perturbs directional cell migration and fiber formation via RhoA, without affecting myoblast specification.","method":"Avian somite inversion experiments, RNAi knockdown of Robo2 and Slit1, RhoA pathway analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with defined migration phenotype and RhoA pathway identification, single lab","pmids":["21653616"],"is_preprint":false},{"year":2015,"finding":"ROBO2 restricts the nephrogenic field and regulates Wolffian duct-nephrogenic cord separation. In Robo2-null embryos, failure of normal separation of mesenchyme from Wolffian duct/ureteric epithelium exposes mesenchyme to abnormally high proliferative stimuli, expanding the metanephric mesenchyme field and number of nephrogenic cord cells, leading to ectopic ureteric bud outgrowths. This suggests SLIT-ROBO signaling limits epithelial/mesenchymal interactions rather than directly attenuating Gdnf expression.","method":"High-resolution 3D imaging of Robo2-null mouse embryos, ex vivo proliferation experiments","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3D imaging with quantitative cell counting and ex vivo functional test, single lab","pmids":["26116176"],"is_preprint":false},{"year":2011,"finding":"Robo2 is required for formation of a normal ureteral orifice and maintenance of the anti-reflux mechanism. In Robo2-deficient mice, hydronephrosis results from high-grade vesicoureteral reflux caused by a dilated and incompetent ureterovesical junction. Robo2 is expressed around the developing ureterovesical junction.","method":"High-resolution micro-ultrasonography, microbubble ultrasound contrast with percutaneous aspiration, immunolocalization of Robo2","journal":"PLoS One","confidence":"High","confidence_rationale":"Tier 2 / Strong — noninvasive functional VUR demonstration combined with Robo2 expression localization at the ureterovesical junction","pmids":["21949750"],"is_preprint":false},{"year":2019,"finding":"Robo2 binds to Baiap2 (IRSp53) through the IRSp53/MIM homology domain in renal epithelial cells. This complex allows Robo2 to phosphorylate MDM2 at Ser166 via Baiap2, maintaining p53 homeostasis. Disruption of the Robo2-Baiap2 complex causes MDM2 dephosphorylation, elevated p53, and p53-mediated cellular senescence, leading to ciliogenesis and polarity defects, cystogenesis. Double KO of Robo2 and p53 rescues all epithelial defects.","method":"Co-immunoprecipitation, phosphorylation assays, Robo2 KO and double Robo2/p53 KO mouse models, epithelial polarization and ciliogenesis assays","journal":"JCI Insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical interaction identification, phosphorylation mechanism, genetic epistasis rescue with double KO","pmids":["31534052"],"is_preprint":false},{"year":2021,"finding":"Soluble TREM-1 (sTREM-1) is a novel non-Slit ligand for Robo2. The interaction was identified by pull-down assay followed by mass spectrometry and verified by immunofluorescence. sTREM-1 binding to Robo2 activates downstream Smad2/3 and PI3K/Akt signaling pathways promoting hepatic stellate cell activation and liver fibrosis. Robo2 knockdown inhibited sTREM-1-induced HSC activation and fibrosis.","method":"Affinity pulldown followed by mass spectrometry, immunofluorescence colocalization, siRNA knockdown of Robo2 in LX-2 cells, AAV-mediated HSC-specific Robo2 knockdown in mouse fibrosis model, Smad2/3 and PI3K/Akt pathway analysis","journal":"Journal of Cellular and Molecular Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — mass spectrometry-based interaction identification plus functional validation with siRNA, in vivo AAV knockdown, and downstream pathway analysis","pmids":["34750987"],"is_preprint":false},{"year":2018,"finding":"Slit2-Robo2 signaling in hepatic stellate cells (HSCs) promotes fibrogenic protein expression via PI3K/Akt pathway activation, and inhibits HSC migration. Recombinant Slit2 promotes fibrogenic protein expression in HSC line; this effect is abrogated by PI3K/Akt inhibitor. Slit2-stimulated inhibition of migration is abrogated by siRNA knockdown of Robo2.","method":"Western blot for fibrogenic proteins, PI3K/Akt pathway inhibitor (LY294002), Robo2 siRNA knockdown, transwell migration assay","journal":"Life Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional cell assays with pharmacological and siRNA perturbations, single lab, immortalized cell line","pmids":["29660433"],"is_preprint":false},{"year":2004,"finding":"In Drosophila, robo2 and robo3 are necessary for serotonergic neuron differentiation and function independently of their ligand Slit. Loss of robo2 or robo3 causes loss of serotonin transporter (SerT) expression in ~half of neurons, and loss of the transcription factor Eagle (Eg) in serotonergic neurons. robo2 and eg interact genetically to regulate SerT expression, placing Robo2 upstream of Eg in a serotonergic differentiation pathway.","method":"Drosophila genetics, SerT and Eg expression analysis in robo2/3 mutants, genetic interaction (robo2;eg double mutant)","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis and expression analysis, Slit-independent function demonstrated, single organism/lab","pmids":["14973268"],"is_preprint":false},{"year":2015,"finding":"In Drosophila, Robo2 plays a non-signaling, non-cell-autonomous role in tendons to promote Slit cleavage, producing a cleaved Slit N-terminal guidance signal essential for muscle-to-tendon guidance. Tendon-specific robo2 RNAi induces muscle patterning defects similar to slit mutants; membrane immobilization of Slit-N on tendons bypasses the requirement for Robo2 in tendons, demonstrating that Robo2's main role is to promote association of Slit with the tendon cell membrane and its subsequent cleavage.","method":"Drosophila genetics, tendon-specific RNAi, rescue with membrane-tethered Slit-N, muscle patterning analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific RNAi plus membrane-tethered Slit rescue demonstrating mechanism, multiple genetic controls","pmids":["26400093"],"is_preprint":false},{"year":2019,"finding":"Alternative splicing of a conserved microexon in mammalian ROBO2 generates isoforms with distinct axon guidance activities. NOVA splicing factors regulate the developmental expression of ROBO2 variants with small sequence differences. The temporal switch from inhibitory to permissive crossing is partly controlled by expression of these ROBO2 isoforms.","method":"Mouse genetics, splice isoform expression analysis, axon guidance behavioral assays, NOVA factor mutant analysis","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic analysis with isoform-specific guidance activity assays, single lab","pmids":["31392959"],"is_preprint":false},{"year":2014,"finding":"Robo3.1A suppresses Slit-mediated repulsion by triggering degradation of Robo2 through recruitment to late endosome/lysosome-dependent degradation pathway. Cotransfection with Robo3.1A significantly reduced Robo2 protein levels in HEK293 cells and cerebellar granule cells. Robo2 and Robo3 colocalize in intracellular vesicles positive for late endosome/lysosome markers.","method":"Cotransfection in HEK293 cells, cerebellar granule cell cultures, cell surface Slit-binding assay, immunoprecipitation, immunocytochemistry with organelle markers","journal":"Journal of Neuroscience Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein level reduction plus co-localization with endosomal markers, single lab, multiple cell systems","pmids":["24936616"],"is_preprint":false},{"year":2013,"finding":"Sim1a and Arnt2 transcription factors contribute to hypothalamo-spinal axon guidance by negatively regulating Robo3a.1 expression, which otherwise blocks Robo2-mediated repulsive axon guidance. The midline displacement phenotype in Sim1a/Arnt2 morphants is suppressed in robo3 mutant embryos; increased Robo3a.1 levels interfere with Robo2 repulsive activity; the N-terminal domain unique to Robo3a.1 mediates this block.","method":"Zebrafish morpholino knockdown, robo3 mutant epistasis, robo3a.1 expression analysis, domain-deletion analysis","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis plus domain analysis demonstrating the Robo3a.1–Robo2 interaction mechanism, single lab","pmids":["23222439"],"is_preprint":false},{"year":2020,"finding":"Neuronal NADPH oxidase 2 (Nox2) acts downstream of Slit2/Robo2 signaling to mediate growth cone collapse, axonal retraction, and repulsive growth cone turning. Slit2 treatment increased growth cone hydrogen peroxide levels via Nox2 activation. astray/nox2 double heterozygote zebrafish larvae exhibited decreased tectal innervation area compared to individual heterozygotes, supporting genetic interaction.","method":"Zebrafish RGC cultures, pharmacological Nox inhibition, ROS biosensor imaging, nox2 mutant fish, astray/nox2 double heterozygote in vivo analysis","journal":"Developmental Neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pharmacological plus ROS imaging plus in vivo genetic interaction, single lab","pmids":["33191581"],"is_preprint":false},{"year":2009,"finding":"Robo2 is the major receptor required for Slit-mediated intraretinal RGC axon guidance in mice. Robo1 knockout mice have normal intraretinal axon guidance, while Robo2 knockout mice make qualitatively and quantitatively identical pathfinding errors to those in Slit1/Slit2 mutants.","method":"Robo1 and Robo2 single knockout mouse comparison, intraretinal axon guidance analysis","journal":"Developmental Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO phenocopy of Slit mutants with receptor-specific discrimination between Robo1 and Robo2","pmids":["19782674"],"is_preprint":false},{"year":2009,"finding":"In Xenopus RGCs, Slit/Robo2 signaling promotes dendrite branching (but not guidance) primarily via Robo2, while Robo2 and Robo3 act in concert for axon extension and guidance. Loss-of-function by antisense knockdown or dominant-negative Robo2 blocked axon extension and caused misrouting, and also reduced dendrite branching.","method":"Antisense morpholino knockdown, dominant-negative Robo2/Robo3 expression, RGC culture, in vitro Slit treatment","journal":"Mechanisms of Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative and knockdown with distinct axon vs. dendrite readouts, single lab","pmids":["19961927"],"is_preprint":false},{"year":2021,"finding":"Robo2 in regenerating zebrafish motor axons is required and sufficient for target-selective peripheral nerve regeneration. Robo2 acts in response to glia located at the nerve branch-point, where spatially restricted Slit signaling prevents and corrects axonal errors during regeneration. robo2 function is required cell-autonomously in regenerating axons.","method":"Zebrafish live cell imaging, molecular-genetic manipulation (robo2 mutants, overexpression), ablation of glial cells at branch-points","journal":"Journal of Neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-autonomous requirement demonstrated by gain- and loss-of-function with live imaging and glia ablation","pmids":["34916258"],"is_preprint":false},{"year":2012,"finding":"Overexpression of Robo2 in embryonic kidney organ culture leads to reduced ureteric bud branching and decreased glomerular number through a reduction in the number of metanephric mesenchyme (MM) cells surrounding the ureteric bud, without affecting MM proliferation or apoptosis.","method":"In vitro embryonic kidney microinjection/electroporation, GFP-Robo2 overexpression, morphometric analysis","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function in organ culture with quantitative cellular readout, single lab","pmids":["22521888"],"is_preprint":false},{"year":2020,"finding":"Loss of Robo2 in podocytes protects adult mice from glomerular injury and foot process effacement. ROBO2 expression in podocytes is upregulated after glomerular injury. Overexpression of ROBO2 in cultured mouse podocytes compromises cell adhesion.","method":"Conditional Robo2 KO (podocyte-specific), ultrastructural analysis, injury models (protamine sulfate, nephrotoxic serum), ROBO2 overexpression adhesion assay","journal":"American Journal of Pathology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with ultrastructural readout, injury rescue, and gain-of-function adhesion assay in cultured cells","pmids":["32220420"],"is_preprint":false},{"year":2020,"finding":"ROBO2 is expressed in the common nephric duct (CND) and primitive bladder, and its novel binding partner retinaldehyde dehydrogenase-2 (RALDH2) mediates CND migration and fusion with the primitive bladder. Loss of Robo2 causes delayed apoptosis from failure of CND fusion, resulting in abnormal ureter connections. Retinoic acid rescues ureter anomalies in Robo2-/- embryos.","method":"Co-immunoprecipitation/binding assay identifying RALDH2 interaction, Robo2 knockout mouse, retinoic acid rescue experiment, apoptosis analysis","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — novel binding partner identified with functional KO phenotype and pharmacological rescue, single lab","pmids":["32562756"],"is_preprint":false},{"year":2021,"finding":"The Slit-binding Ig1 domain of Robo2 is required for Robo2's midline repulsion activity, lateral axon pathway formation, and proper subcellular localization in Drosophila embryonic neurons in vivo. Robo2ΔIg1 fails to substitute for wild-type Robo2 in both midline repulsion and lateral pathway formation; removal of Ig1 disrupts proper subcellular localization of Robo2, a role not shared by the Ig1 domain of Robo1.","method":"CRISPR/Cas9 domain replacement (Robo2ΔIg1 knock-in), axon guidance assays, protein localization analysis","journal":"Genesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR-based endogenous domain replacement with multiple functional and localization readouts","pmids":["34411419"],"is_preprint":false},{"year":2023,"finding":"Robo2 actively maintains adult pancreatic islet architecture in β cells. Conditional deletion of Robo2 in adult β cells causes significant loss of islet architecture without affecting β cell identity, maturation, or stress.","method":"Conditional Robo2 deletion in adult β cells, histological and immunofluorescence analysis of islet architecture","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with islet architecture readout, distinguishes developmental from maintenance function, single lab","pmids":["37972678"],"is_preprint":false},{"year":2026,"finding":"CD47 stabilizes ROBO2 by sequestering the E3 ubiquitin ligase ITCH, thereby blocking ubiquitination and proteasomal degradation of ROBO2. Loss of ROBO2 similarly reduces GBM cell proliferation and migration. CD47 loss impairs GBM cell proliferation and migration in an immune-independent manner.","method":"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, ROBO2 knockdown/overexpression, in vivo tumor burden analysis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical mechanism (ubiquitin ligase sequestration) demonstrated with co-IP, ubiquitination assay, and in vivo tumor data","pmids":["41871254"],"is_preprint":false},{"year":2022,"finding":"Robo2 and Gen1 co-regulate ureteric bud formation by activating the MAPK/ERK signaling pathway. Double disruption of Robo2 and Gen1 synergistically increases CAKUT phenotypes and ectopic UB formation. Robo2 and Gen1 exert synergistic effects on GDNF/RET pathway and downstream MAPK/ERK signaling to promote cell proliferation.","method":"Double-mutant mouse model (piggyBac transposon disruption), MAPK/ERK pathway analysis, GDNF/RET signaling measurements","journal":"Frontiers in Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — double-mutant synergistic phenotype with pathway analysis, single lab","pmids":["35071283"],"is_preprint":false},{"year":2011,"finding":"In mouse spinal cord, Robo2 is the main receptor for directing axons within dorsal longitudinal tracts, and has a distinct function in repelling neuron cell bodies from the floor plate, distinct from Robo1 (which guides ventral tract axons and prevents midline crossing).","method":"Robo1 and Robo2 single KO mouse comparison, reduction-of-function genetics, longitudinal axon trajectory analysis","journal":"Developmental Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single KO and compound genetics distinguishing dorsal vs. ventral tract roles, single lab","pmids":["21820427"],"is_preprint":false},{"year":2025,"finding":"Slit1b/2-Robo2 repulsive signaling in the amacrine cell layer is essential to initiate apical migration of horizontal cells during retinal lamination. Disruption of Robo2 causes basal retention of horizontal cells.","method":"Zebrafish CRISPR targeted screening, live imaging of horizontal cell migration, transcriptomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with live imaging readout, preprint, single lab","pmids":["bio_10.1101_2025.07.23.666134"],"is_preprint":true},{"year":2026,"finding":"Soluble TREM-1 (sTREM-1) acts as a ligand for ROBO2 in hippocampal neurons, and their interaction activates downstream ERK signaling. Knockdown of neuronal ROBO2 mitigated aging-related hippocampal synaptic degeneration and cognitive impairments. sTREM-1 reduced expression of synaptic proteins via the ROBO2/ERK pathway.","method":"In vivo ROBO2 knockdown in hippocampal neurons, ELISA, ERK pathway analysis, senescence accelerated mouse model","journal":"Molecular Neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO with pathway analysis, corroborated by earlier sTREM-1/Robo2 interaction findings in liver, single lab","pmids":["42234329"],"is_preprint":false}],"current_model":"ROBO2 is a transmembrane receptor for SLIT ligands (SLIT1, SLIT2, SLIT3) that mediates repulsive axon guidance, cell migration, and tissue morphogenesis by signaling through downstream effectors including Rac1, RhoA, Cdc42, NCK, SRGAP1, and nonmuscle myosin IIA; in the kidney, SLIT2/ROBO2 restricts GDNF expression domain and nephrogenic mesenchyme field to position ureteric bud outgrowth and maintain the anti-reflux mechanism at the ureterovesical junction; in podocytes, ROBO2 forms a complex with nephrin via NCK, inhibiting actin polymerization and podocyte adhesion; ROBO2 also acts non-cell-autonomously (e.g., in Drosophila tendons to promote Slit cleavage, and in trans to inhibit Robo1 signaling), and can be regulated by ubiquitination (via ITCH, counteracted by CD47) and by its ectodomain conformation (which controls cryptic NELL1/2 binding in a pH-dependent manner)."},"narrative":{"mechanistic_narrative":"ROBO2 is a single-pass transmembrane receptor for secreted SLIT ligands that transduces predominantly repulsive guidance cues to control axon pathfinding, cell migration, and epithelial tissue morphogenesis [PMID:11163264, PMID:19782674, PMID:15130495]. In the nervous system it directs midline and post-crossing commissural axon guidance, dorsal longitudinal tract formation, olfactory and retinal axon targeting, dendrite branching, and target-selective nerve regeneration, often acting cell-autonomously through its SLIT-binding Ig1 domain [PMID:11163264, PMID:20631173, PMID:17715346, PMID:17640525, PMID:19782674, PMID:34916258, PMID:34411419]. Downstream, SLIT-ROBO2 signaling reshapes the actin cytoskeleton via Rho-family GTPases — driving Rac1-dependent endothelial lamellipodia, RhoA-dependent myoblast migration, and Cdc42-dependent synaptic actin dynamics — and engages neuronal NADPH oxidase 2 to mediate growth cone collapse [PMID:25894826, PMID:21653616, PMID:31180321, PMID:33191581]. ROBO2 also performs non-canonical roles: it acts in trans to inhibit Robo1-mediated repulsion and promote midline crossing, and functions non-cell-autonomously in tendons to promote SLIT cleavage and in the epithelium as a stromal suppressor that restrains TGF-β/Wnt-driven myofibroblast activation [PMID:26186094, PMID:26400093, PMID:30504844]. In the urogenital system, SLIT2/ROBO2 restricts the GDNF expression domain and nephrogenic mesenchyme field to position a single ureteric bud and maintain the anti-reflux ureterovesical junction, and ROBO2 disruption causes vesicoureteral reflux in mouse and human [PMID:15130495, PMID:17357069, PMID:26116176, PMID:21949750]. In podocytes ROBO2 assembles with nephrin via the adaptor NCK to inhibit actin polymerization and, through a SRGAP1/nonmuscle myosin IIA complex, destabilizes adhesion, so that ROBO2 loss protects against injury-induced foot process effacement [PMID:22840396, PMID:27882344, PMID:32220420]. ROBO2 additionally binds non-SLIT ligands — NELL1/2 at a pH- and conformation-gated cryptic FNIII site, and soluble TREM-1 to activate Smad2/3, PI3K/Akt, and ERK signaling in hepatic stellate cells and neurons — and is regulated by alternative splicing, by Robo3.1A-driven lysosomal degradation, and by CD47-mediated sequestration of the E3 ligase ITCH that otherwise targets ROBO2 for ubiquitin-proteasome turnover [PMID:30700556, PMID:35940226, PMID:34750987, PMID:42234329, PMID:31392959, PMID:24936616, PMID:41871254].","teleology":[{"year":2000,"claim":"Established that ROBO2 is a bona fide SLIT receptor mediating axon repulsion, settling whether it functions alongside Robo1 in midline guidance.","evidence":"Drosophila single/double mutant epistasis showing robo,robo2 double mutants phenocopy slit","pmids":["11163264"],"confidence":"High","gaps":["Did not resolve the distinct downstream effectors of Robo2 versus Robo1","Vertebrate receptor specialization not addressed"]},{"year":2004,"claim":"Extended ROBO2 function beyond neurons to epithelial morphogenesis by showing SLIT2/ROBO2 limits the GDNF domain to position a single ureteric bud.","evidence":"Slit2 and Robo2 knockout mice with in situ analysis of Gdnf","pmids":["15130495"],"confidence":"High","gaps":["Whether the signal acts by directly attenuating Gdnf or by limiting epithelial-mesenchymal interactions was unresolved","Downstream effectors in mesenchyme unknown"]},{"year":2007,"claim":"Linked ROBO2 to human disease by showing dominant-negative ROBO2 abrogates signaling and Robo2 haploinsufficiency causes vesicoureteral reflux.","evidence":"Human de novo translocation, in vitro dominant-negative signaling assay, heterozygous Robo2 mice","pmids":["17357069"],"confidence":"High","gaps":["Mechanism connecting reflux to ureterovesical junction defect not yet defined"]},{"year":2009,"claim":"Defined receptor-specific roles in vertebrate axon guidance, demonstrating ROBO2 (not Robo1) is the major intraretinal and olfactory targeting receptor and supports dendrite branching.","evidence":"Robo1 vs Robo2 single-KO mouse phenocopy comparisons, Xenopus knockdown/dominant-negative, chick gangliogenesis perturbation","pmids":["19782674","17715346","19961927","18278043"],"confidence":"High","gaps":["Intracellular effectors distinguishing Robo2 from Robo1 not identified","How a single receptor partitions axon versus dendrite outputs unclear"]},{"year":2012,"claim":"Revealed the cytoskeletal mechanism in podocytes by identifying a ROBO2-NCK-nephrin complex that inhibits actin polymerization.","evidence":"Co-IP, actin polymerization assay, Robo2 KO ultrastructure, Robo2/nephrin epistasis","pmids":["22840396"],"confidence":"High","gaps":["Did not define how actin inhibition translates to foot process architecture","Adhesion machinery downstream not yet identified"]},{"year":2015,"claim":"Uncovered non-canonical trans and ligand-processing roles, showing Robo2 can inhibit Robo1 in trans and acts non-signaling in tendons to promote Slit cleavage.","evidence":"Drosophila genetics, ectodomain binding, membrane-tethered Slit-N rescue","pmids":["26186094","26400093"],"confidence":"High","gaps":["Structural basis of Robo2-Robo1 trans interaction not resolved","Protease responsible for tendon Slit cleavage unknown"]},{"year":2016,"claim":"Mechanistically connected ROBO2 to adhesion by defining a ROBO2/SRGAP1/NMIIA complex that destabilizes podocyte attachment.","evidence":"Co-IP, direct interaction assays, focal adhesion and adhesion assays, podocyte-specific KO injury model","pmids":["27882344"],"confidence":"High","gaps":["How SRGAP1 GAP activity feeds into myosin regulation in vivo not fully traced"]},{"year":2019,"claim":"Defined ligand-gating and effector diversification: a cryptic pH-dependent NELL1/2 site, splice-isoform guidance switching, Cdc42-driven synaptic actin control, and a Baiap2-MDM2-p53 epithelial survival axis.","evidence":"Binding/mutagenesis assays, NOVA splice analysis with guidance assays, zebrafish actin imaging with DN-Cdc42, Robo2/p53 double-KO epistasis","pmids":["30700556","31392959","31180321","31534052"],"confidence":"High","gaps":["Physiological trigger unmasking the NELL1/2 site in vivo unclear","Whether NELL ligands compete with SLIT functionally not established"]},{"year":2021,"claim":"Identified soluble TREM-1 as a non-SLIT ligand and a trans-synaptic Neurexin partner, broadening ROBO2 ligand repertoire and synaptogenic function.","evidence":"Pull-down/mass spectrometry, trans-synaptic binding assays, conditional KO with circuit imaging, regeneration imaging","pmids":["34750987","34686348","34916258"],"confidence":"High","gaps":["Structural basis of sTREM-1 and Neurexin binding to ROBO2 not defined","Whether these ligands signal through the same intracellular routes as SLIT unknown"]},{"year":2022,"claim":"Provided the conformational logic for ligand gating, showing the ectodomain shifts from extended to compact under acidic pH to expose the NELL1/2 site.","evidence":"FRET conformational sensors, size exclusion chromatography, isoform binding affinities","pmids":["35940226"],"confidence":"Medium","gaps":["FRET-based conformational model awaits high-resolution structural confirmation","In vivo relevance of acidic-pH gating not demonstrated"]},{"year":2026,"claim":"Established post-translational stability control, showing CD47 sequesters the E3 ligase ITCH to block ROBO2 ubiquitination and support tumor cell proliferation.","evidence":"Co-IP, ubiquitination and proteasome assays, knockdown/overexpression, in vivo tumor burden","pmids":["41871254"],"confidence":"High","gaps":["ITCH ubiquitination site on ROBO2 not mapped","Whether this regulation operates outside glioblastoma not addressed"]},{"year":null,"claim":"How the diverse ligand inputs (SLIT, NELL1/2, sTREM-1, Neurexin) and effector branches (Rac1, RhoA, Cdc42, NCK/nephrin, SRGAP1/NMIIA, Nox2, Baiap2/MDM2) are selected in a given cell type to yield repulsion versus adhesion versus survival outputs remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model of ROBO2 signal selection across tissues","Cytoplasmic domain interactions linking ligand engagement to each effector branch incompletely mapped","Structural basis of receptor activation by SLIT not in corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,30,12]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[21]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4,13,5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma 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the ventral midline of the neural tube and projection of axons to different regions during neuronal development","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q9HCK4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ROBO2","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/ROBO2","total_profiled":1310},"omim":[{"mim_id":"620672","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 24; LRRC24","url":"https://www.omim.org/entry/620672"},{"mim_id":"616771","title":"MICRO RNA 218-2; MIR218-2","url":"https://www.omim.org/entry/616771"},{"mim_id":"616770","title":"MICRO RNA 218-1; MIR218-1","url":"https://www.omim.org/entry/616770"},{"mim_id":"610878","title":"VESICOURETERAL REFLUX 2; VUR2","url":"https://www.omim.org/entry/610878"},{"mim_id":"606523","title":"SLIT-ROBO RHO GTPase-ACTIVATING PROTEIN 1; SRGAP1","url":"https://www.omim.org/entry/606523"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":10.4},{"tissue":"ovary","ntpm":13.1}],"url":"https://www.proteinatlas.org/search/ROBO2"},"hgnc":{"alias_symbol":["KIAA1568"],"prev_symbol":[]},"alphafold":{"accession":"Q9HCK4","domains":[{"cath_id":"2.60.40.10","chopping":"33-129","consensus_level":"high","plddt":92.321,"start":33,"end":129},{"cath_id":"2.60.40.10","chopping":"132-222","consensus_level":"medium","plddt":92.588,"start":132,"end":222},{"cath_id":"2.60.40.10","chopping":"231-311","consensus_level":"medium","plddt":93.3736,"start":231,"end":311},{"cath_id":"2.60.40.10","chopping":"320-413","consensus_level":"medium","plddt":90.0687,"start":320,"end":413},{"cath_id":"2.60.40.10","chopping":"415-514","consensus_level":"medium","plddt":86.4589,"start":415,"end":514},{"cath_id":"2.60.40.10","chopping":"521-617","consensus_level":"medium","plddt":91.6296,"start":521,"end":617},{"cath_id":"2.60.40.10","chopping":"628-733","consensus_level":"medium","plddt":92.045,"start":628,"end":733},{"cath_id":"2.60.40.10","chopping":"742-834","consensus_level":"high","plddt":83.2137,"start":742,"end":834}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCK4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCK4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9HCK4-F1-predicted_aligned_error_v6.png","plddt_mean":67.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ROBO2","jax_strain_url":"https://www.jax.org/strain/search?query=ROBO2"},"sequence":{"accession":"Q9HCK4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9HCK4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9HCK4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9HCK4"}},"corpus_meta":[{"pmid":"15130495","id":"PMC_15130495","title":"SLIT2-mediated 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Mouse mutants lacking SLIT2 or ROBO2 develop supernumerary ureteric buds with inappropriately maintained anterior Gdnf expression, demonstrating that the SLIT2/ROBO2 signal is transduced in the nephrogenic mesenchyme.\",\n      \"method\": \"Knockout mouse genetics (Slit2-/- and Robo2-/- mutants), in situ hybridization for Gdnf expression\",\n      \"journal\": \"Developmental Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype, replicated across two ligand/receptor knockouts with consistent molecular readout\",\n      \"pmids\": [\"15130495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Drosophila Robo and Robo2 have distinct and complementary roles in midline repulsion; robo,robo2 double mutants phenocopy slit mutants, indicating Robo2 is a functional Slit receptor contributing to midline axon guidance alongside Robo1.\",\n      \"method\": \"Drosophila genetics (single and double mutant analysis), axon trajectory imaging\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis via double-mutant analysis replicating slit phenotype, foundational Drosophila ortholog study\",\n      \"pmids\": [\"11163264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SLIT2 acting through ROBO1 and ROBO2 promotes retinal neovascularization by driving endothelial cell migration, and is required for both Slit2- and VEGF-induced Rac1 activation and lamellipodia formation.\",\n      \"method\": \"Conditional knockout mice deficient in Slit2, Robo1, and Robo2; endothelial cell migration assays; Rac1 activation assays; lamellipodia imaging\",\n      \"journal\": \"Nature Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined cellular phenotype plus mechanistic downstream signaling (Rac1 activation) using multiple orthogonal methods\",\n      \"pmids\": [\"25894826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human ROBO2 disruption by a de novo translocation produces dominant-negative ROBO2 proteins that abrogate SLIT-ROBO signaling in vitro, and heterozygous Robo2 mouse mutants exhibit vesicoureteral reflux with ureterovesical junction defects.\",\n      \"method\": \"In vitro signaling assay with dominant-negative ROBO2, heterozygous/mosaic Robo2 mouse models, human genetics\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative functional assay in vitro combined with mouse model genetics and human family studies\",\n      \"pmids\": [\"17357069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ROBO2 forms a complex with nephrin in kidney podocytes through the adaptor protein NCK. Slit2-Robo2 signaling inhibits nephrin-induced actin polymerization, and loss of Robo2 in mice increases F-actin associated with nephrin, altering podocyte foot process structure. Genetic interaction shows Robo2 loss alleviates abnormal podocyte structural phenotype in nephrin null mice.\",\n      \"method\": \"Co-immunoprecipitation/biochemical pulldown, actin polymerization assay, Robo2 knockout mouse ultrastructure, epistasis analysis in Robo2/nephrin double mutants\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical complex identification plus in vitro functional assay plus in vivo KO phenotype plus genetic epistasis\",\n      \"pmids\": [\"22840396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SLIT2/ROBO2 signaling inhibits nonmuscle myosin IIA (NMIIA) activity and destabilizes podocyte adhesion via a SRGAP1-dependent pathway. MRLC (myosin II regulatory light chain) interacts directly with SRGAP1 and forms a ROBO2/SRGAP1/NMIIA complex in the presence of SLIT2. SLIT2 stimulation decreases focal adhesion formation and reduces podocyte attachment to collagen. Podocyte-specific Robo2 knockout protects mice from hypertension-induced podocyte detachment and albuminuria.\",\n      \"method\": \"Co-immunoprecipitation, direct protein interaction assay, focal adhesion assay, podocyte adhesion assay, conditional KO mouse model, in vivo injury studies\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct protein interaction plus functional in vitro assays plus conditional KO in vivo with defined phenotypic readouts\",\n      \"pmids\": [\"27882344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Robo2 acts in trans (non-cell-autonomously) to inhibit Slit-Robo1 repulsion in Drosophila pre-crossing commissural axons. Robo2 expressed in midline cells can bind Robo1 via extracellular domains and rescue robo2-dependent midline crossing defects non-cell-autonomously; the extracellular domains required for Robo1 binding are also required for Robo2's midline-crossing promotion activity.\",\n      \"method\": \"Drosophila genetics, gain-of-function/rescue assays, extracellular domain binding experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — binding assay plus non-cell-autonomous genetic rescue plus domain deletion analysis with multiple functional readouts\",\n      \"pmids\": [\"26186094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Slit1-Robo2 signaling is essential for trigeminal ganglion assembly: placode cells express Robo2 and early migrating cranial neural crest cells express Slit1; perturbation of Robo2 function or depletion of Robo2 or Slit1 disrupts ganglion formation, mimicking neural crest ablation.\",\n      \"method\": \"Chick embryo RNA interference (siRNA), Robo2 function blocking, neural crest ablation, in vivo ganglion imaging\",\n      \"journal\": \"Nature Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal perturbation of receptor and ligand with consistent phenotype, multiple experimental approaches in vivo\",\n      \"pmids\": [\"18278043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"N-cadherin acts in concert with Slit1-Robo2 signaling during gangliogenesis. Blocking or augmenting Slit-Robo signaling modulates N-cadherin protein expression on the placodal cell surface, suggesting post-translational regulation of N-cadherin by Slit-Robo2; co-expression of N-cadherin with dominant-negative Robo abrogates the Robo2 loss-of-function phenotype.\",\n      \"method\": \"Chick embryo siRNA knockdown, dominant-negative Robo2, rescue experiments, N-cadherin surface expression assay\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo functional perturbations in a single lab; post-translational mechanism inferred but not directly demonstrated by biochemistry\",\n      \"pmids\": [\"19934013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Robo1 and Robo2 have distinct specialized roles in post-crossing commissural axon guidance in the mouse spinal cord: Robo2 is required for axons to project away from the floor plate into the lateral funiculus, while Robo1 prevents axonal stalling after crossing. Genetic rescue experiments (Robo3 failure-to-cross rescued largely but not fully by loss of both Robo1 and Robo2) suggest existence of an additional Slit receptor.\",\n      \"method\": \"Mouse genetics, combination KO mutants (Robo1, Robo2, Robo3 single and double/triple mutants), axon trajectory analysis\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis via multiple combination mutants with specific trajectory readouts distinguishing Robo1 vs Robo2 functions\",\n      \"pmids\": [\"20631173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Robo2 is required for zonal segregation of olfactory sensory neuron (OSN) axons along the dorsoventral axis of the olfactory bulb. Robo2 is expressed in OSNs in a high dorsomedial to low ventrolateral gradient, and in robo-2-/- mice, a subset of OSN axons normally projecting to the dorsal OB mistarget to the ventral region. Slit1 is expressed in the ventral OB consistent with repulsion of Robo2-expressing dorsal axons.\",\n      \"method\": \"Robo2 and Slit1 knockout mice, axon targeting analysis, expression mapping\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific axon mistargeting phenotype, consistent ligand/receptor expression patterns\",\n      \"pmids\": [\"17715346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Slit1a acts through Robo2 to inhibit retinal ganglion cell (RGC) arborization and synaptogenesis in the CNS. Dominant-negative Robo2 expressed in single RGCs phenocopies ast (robo2) mutant increased arborization, and full-length Robo2 rescues it, indicating cell-autonomous action. Genetic analysis shows Slit1a acts partly through Robo2 and partly through Robo2-independent pathways.\",\n      \"method\": \"Zebrafish astray/robo2 mutants, slit1a morphants, single-cell dominant-negative and rescue experiments, time-lapse imaging of arbor development, YFP-Rab3 synapse labeling\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous rescue with full-length Robo2, single-cell dominant-negative, time-lapse imaging, genetic epistasis\",\n      \"pmids\": [\"17640525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Robo2 plays a synaptogenic role in hippocampal CA1, acting postsynaptically in pyramidal neurons for formation of excitatory (but not inhibitory) synapses specifically in proximal dendritic compartments. Robo2 synaptogenic activity involves a trans-synaptic interaction with presynaptic Neurexins, as well as binding to its canonical extracellular ligand Slit. Preventing Robo2-dependent excitatory synapse formation alters place cell properties of adult CA1 neurons.\",\n      \"method\": \"In vivo conditional KO, in vitro trans-synaptic binding assays, 2-photon Ca2+ imaging in behaving mice\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO with compartment-specific synapse phenotype, biochemical binding assay identifying Neurexin interaction, functional circuit readout\",\n      \"pmids\": [\"34686348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Robo2 regulates synaptic oxytocin content by affecting actin dynamics via a Slit3-Robo2-Cdc42 pathway. Genetic loss of robo2 decreases synaptic OXT levels and reduces mobility of the actin probe Lifeact-EGFP in OXT synapses, slowing vesicle accumulation. OXT-specific dominant-negative Cdc42 expression links Robo2 to local actin dynamics at synapses.\",\n      \"method\": \"Zebrafish robo2 mutant, live imaging of Lifeact-EGFP and OXT vesicles, dominant-negative Cdc42 expression, cytochalasin-D treatment\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO combined with live imaging, actin probe dynamics, and pathway dissection via dominant-negative effector\",\n      \"pmids\": [\"31180321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SLIT/ROBO2 signaling promotes mammary stem cell senescence by inhibiting WNT signaling. Absence of SLIT/ROBO2 signaling leads to increased nuclear β-catenin, repressed expression of p16(INK4a), and delayed mammary stem cell senescence, thereby enhancing stem cell renewal.\",\n      \"method\": \"Robo2 knockout mouse mammary gland analysis, β-catenin nuclear localization, p16(INK4a) expression, stem cell renewal assays\",\n      \"journal\": \"Stem Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with defined molecular readouts (β-catenin, p16), single lab\",\n      \"pmids\": [\"25241737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Epithelial ROBO2 loss activates Robo1+ myofibroblasts and induces TGF-β and Wnt pathways, acting non-autonomously as a stroma suppressor gene. In Robo2-deficient pancreatic epithelium (Pdx1Cre;Robo2F/F mice), enhanced myofibroblast activation, collagen crosslinking, and T-cell infiltration were suppressed by the TGF-β inhibitor galunisertib.\",\n      \"method\": \"Conditional KO (Pdx1Cre;Robo2F/F), cell culture fibroblast activation assays, TGF-β pathway analysis, TGF-β inhibitor rescue\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with pathway identification (TGF-β), pharmacological rescue with pathway inhibitor, multiple cellular readouts\",\n      \"pmids\": [\"30504844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Robo2 contains a cryptic binding site for NELL1 and NELL2 in its first fibronectin type III (FNIII) domain, occluded in intact Robo2 at neutral pH. NELL1/2 binding to Robo2 is enabled under acidic conditions or when Robo2 undergoes proteolytic digestion or conformational change; specific amino acids in the first FNIII domain critical for NELL1 binding were identified by mutation analysis.\",\n      \"method\": \"Binding assays (cell surface binding), site-directed mutagenesis of FNIII domain, Robo2 deletion mutants, pH-dependent binding affinity measurements\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding reconstitution with mutagenesis identifying specific critical residues, single lab\",\n      \"pmids\": [\"30700556\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The Robo2 ectodomain undergoes a conformational change from an extended hairpin-like structure to a compact form under acidic pH, which attenuates interactions between Ig-like and FNIII domains to unmask the NELL1/2-binding site. Alternative splicing isoforms of Robo2 have distinct NELL1/2-binding affinities correlated with differences in ectodomain conformation.\",\n      \"method\": \"FRET-based conformational indicators inserted into Robo2 ectodomain, size exclusion chromatography, binding affinity measurements for isoforms\",\n      \"journal\": \"Journal of Molecular Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — FRET structural analysis with biochemical validation, single lab\",\n      \"pmids\": [\"35940226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Sclerotome-derived Slit1 drives directional migration and differentiation of Robo2-expressing pioneer myoblasts. Robo2 is expressed downstream of MyoD and Myf5. Loss of Robo2 or sclerotome-derived Slit1 perturbs directional cell migration and fiber formation via RhoA, without affecting myoblast specification.\",\n      \"method\": \"Avian somite inversion experiments, RNAi knockdown of Robo2 and Slit1, RhoA pathway analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with defined migration phenotype and RhoA pathway identification, single lab\",\n      \"pmids\": [\"21653616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ROBO2 restricts the nephrogenic field and regulates Wolffian duct-nephrogenic cord separation. In Robo2-null embryos, failure of normal separation of mesenchyme from Wolffian duct/ureteric epithelium exposes mesenchyme to abnormally high proliferative stimuli, expanding the metanephric mesenchyme field and number of nephrogenic cord cells, leading to ectopic ureteric bud outgrowths. This suggests SLIT-ROBO signaling limits epithelial/mesenchymal interactions rather than directly attenuating Gdnf expression.\",\n      \"method\": \"High-resolution 3D imaging of Robo2-null mouse embryos, ex vivo proliferation experiments\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3D imaging with quantitative cell counting and ex vivo functional test, single lab\",\n      \"pmids\": [\"26116176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Robo2 is required for formation of a normal ureteral orifice and maintenance of the anti-reflux mechanism. In Robo2-deficient mice, hydronephrosis results from high-grade vesicoureteral reflux caused by a dilated and incompetent ureterovesical junction. Robo2 is expressed around the developing ureterovesical junction.\",\n      \"method\": \"High-resolution micro-ultrasonography, microbubble ultrasound contrast with percutaneous aspiration, immunolocalization of Robo2\",\n      \"journal\": \"PLoS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — noninvasive functional VUR demonstration combined with Robo2 expression localization at the ureterovesical junction\",\n      \"pmids\": [\"21949750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Robo2 binds to Baiap2 (IRSp53) through the IRSp53/MIM homology domain in renal epithelial cells. This complex allows Robo2 to phosphorylate MDM2 at Ser166 via Baiap2, maintaining p53 homeostasis. Disruption of the Robo2-Baiap2 complex causes MDM2 dephosphorylation, elevated p53, and p53-mediated cellular senescence, leading to ciliogenesis and polarity defects, cystogenesis. Double KO of Robo2 and p53 rescues all epithelial defects.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, Robo2 KO and double Robo2/p53 KO mouse models, epithelial polarization and ciliogenesis assays\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical interaction identification, phosphorylation mechanism, genetic epistasis rescue with double KO\",\n      \"pmids\": [\"31534052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Soluble TREM-1 (sTREM-1) is a novel non-Slit ligand for Robo2. The interaction was identified by pull-down assay followed by mass spectrometry and verified by immunofluorescence. sTREM-1 binding to Robo2 activates downstream Smad2/3 and PI3K/Akt signaling pathways promoting hepatic stellate cell activation and liver fibrosis. Robo2 knockdown inhibited sTREM-1-induced HSC activation and fibrosis.\",\n      \"method\": \"Affinity pulldown followed by mass spectrometry, immunofluorescence colocalization, siRNA knockdown of Robo2 in LX-2 cells, AAV-mediated HSC-specific Robo2 knockdown in mouse fibrosis model, Smad2/3 and PI3K/Akt pathway analysis\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mass spectrometry-based interaction identification plus functional validation with siRNA, in vivo AAV knockdown, and downstream pathway analysis\",\n      \"pmids\": [\"34750987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Slit2-Robo2 signaling in hepatic stellate cells (HSCs) promotes fibrogenic protein expression via PI3K/Akt pathway activation, and inhibits HSC migration. Recombinant Slit2 promotes fibrogenic protein expression in HSC line; this effect is abrogated by PI3K/Akt inhibitor. Slit2-stimulated inhibition of migration is abrogated by siRNA knockdown of Robo2.\",\n      \"method\": \"Western blot for fibrogenic proteins, PI3K/Akt pathway inhibitor (LY294002), Robo2 siRNA knockdown, transwell migration assay\",\n      \"journal\": \"Life Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cell assays with pharmacological and siRNA perturbations, single lab, immortalized cell line\",\n      \"pmids\": [\"29660433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In Drosophila, robo2 and robo3 are necessary for serotonergic neuron differentiation and function independently of their ligand Slit. Loss of robo2 or robo3 causes loss of serotonin transporter (SerT) expression in ~half of neurons, and loss of the transcription factor Eagle (Eg) in serotonergic neurons. robo2 and eg interact genetically to regulate SerT expression, placing Robo2 upstream of Eg in a serotonergic differentiation pathway.\",\n      \"method\": \"Drosophila genetics, SerT and Eg expression analysis in robo2/3 mutants, genetic interaction (robo2;eg double mutant)\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis and expression analysis, Slit-independent function demonstrated, single organism/lab\",\n      \"pmids\": [\"14973268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In Drosophila, Robo2 plays a non-signaling, non-cell-autonomous role in tendons to promote Slit cleavage, producing a cleaved Slit N-terminal guidance signal essential for muscle-to-tendon guidance. Tendon-specific robo2 RNAi induces muscle patterning defects similar to slit mutants; membrane immobilization of Slit-N on tendons bypasses the requirement for Robo2 in tendons, demonstrating that Robo2's main role is to promote association of Slit with the tendon cell membrane and its subsequent cleavage.\",\n      \"method\": \"Drosophila genetics, tendon-specific RNAi, rescue with membrane-tethered Slit-N, muscle patterning analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific RNAi plus membrane-tethered Slit rescue demonstrating mechanism, multiple genetic controls\",\n      \"pmids\": [\"26400093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Alternative splicing of a conserved microexon in mammalian ROBO2 generates isoforms with distinct axon guidance activities. NOVA splicing factors regulate the developmental expression of ROBO2 variants with small sequence differences. The temporal switch from inhibitory to permissive crossing is partly controlled by expression of these ROBO2 isoforms.\",\n      \"method\": \"Mouse genetics, splice isoform expression analysis, axon guidance behavioral assays, NOVA factor mutant analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic analysis with isoform-specific guidance activity assays, single lab\",\n      \"pmids\": [\"31392959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Robo3.1A suppresses Slit-mediated repulsion by triggering degradation of Robo2 through recruitment to late endosome/lysosome-dependent degradation pathway. Cotransfection with Robo3.1A significantly reduced Robo2 protein levels in HEK293 cells and cerebellar granule cells. Robo2 and Robo3 colocalize in intracellular vesicles positive for late endosome/lysosome markers.\",\n      \"method\": \"Cotransfection in HEK293 cells, cerebellar granule cell cultures, cell surface Slit-binding assay, immunoprecipitation, immunocytochemistry with organelle markers\",\n      \"journal\": \"Journal of Neuroscience Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein level reduction plus co-localization with endosomal markers, single lab, multiple cell systems\",\n      \"pmids\": [\"24936616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sim1a and Arnt2 transcription factors contribute to hypothalamo-spinal axon guidance by negatively regulating Robo3a.1 expression, which otherwise blocks Robo2-mediated repulsive axon guidance. The midline displacement phenotype in Sim1a/Arnt2 morphants is suppressed in robo3 mutant embryos; increased Robo3a.1 levels interfere with Robo2 repulsive activity; the N-terminal domain unique to Robo3a.1 mediates this block.\",\n      \"method\": \"Zebrafish morpholino knockdown, robo3 mutant epistasis, robo3a.1 expression analysis, domain-deletion analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis plus domain analysis demonstrating the Robo3a.1–Robo2 interaction mechanism, single lab\",\n      \"pmids\": [\"23222439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Neuronal NADPH oxidase 2 (Nox2) acts downstream of Slit2/Robo2 signaling to mediate growth cone collapse, axonal retraction, and repulsive growth cone turning. Slit2 treatment increased growth cone hydrogen peroxide levels via Nox2 activation. astray/nox2 double heterozygote zebrafish larvae exhibited decreased tectal innervation area compared to individual heterozygotes, supporting genetic interaction.\",\n      \"method\": \"Zebrafish RGC cultures, pharmacological Nox inhibition, ROS biosensor imaging, nox2 mutant fish, astray/nox2 double heterozygote in vivo analysis\",\n      \"journal\": \"Developmental Neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pharmacological plus ROS imaging plus in vivo genetic interaction, single lab\",\n      \"pmids\": [\"33191581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Robo2 is the major receptor required for Slit-mediated intraretinal RGC axon guidance in mice. Robo1 knockout mice have normal intraretinal axon guidance, while Robo2 knockout mice make qualitatively and quantitatively identical pathfinding errors to those in Slit1/Slit2 mutants.\",\n      \"method\": \"Robo1 and Robo2 single knockout mouse comparison, intraretinal axon guidance analysis\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO phenocopy of Slit mutants with receptor-specific discrimination between Robo1 and Robo2\",\n      \"pmids\": [\"19782674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Xenopus RGCs, Slit/Robo2 signaling promotes dendrite branching (but not guidance) primarily via Robo2, while Robo2 and Robo3 act in concert for axon extension and guidance. Loss-of-function by antisense knockdown or dominant-negative Robo2 blocked axon extension and caused misrouting, and also reduced dendrite branching.\",\n      \"method\": \"Antisense morpholino knockdown, dominant-negative Robo2/Robo3 expression, RGC culture, in vitro Slit treatment\",\n      \"journal\": \"Mechanisms of Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative and knockdown with distinct axon vs. dendrite readouts, single lab\",\n      \"pmids\": [\"19961927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Robo2 in regenerating zebrafish motor axons is required and sufficient for target-selective peripheral nerve regeneration. Robo2 acts in response to glia located at the nerve branch-point, where spatially restricted Slit signaling prevents and corrects axonal errors during regeneration. robo2 function is required cell-autonomously in regenerating axons.\",\n      \"method\": \"Zebrafish live cell imaging, molecular-genetic manipulation (robo2 mutants, overexpression), ablation of glial cells at branch-points\",\n      \"journal\": \"Journal of Neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-autonomous requirement demonstrated by gain- and loss-of-function with live imaging and glia ablation\",\n      \"pmids\": [\"34916258\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of Robo2 in embryonic kidney organ culture leads to reduced ureteric bud branching and decreased glomerular number through a reduction in the number of metanephric mesenchyme (MM) cells surrounding the ureteric bud, without affecting MM proliferation or apoptosis.\",\n      \"method\": \"In vitro embryonic kidney microinjection/electroporation, GFP-Robo2 overexpression, morphometric analysis\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function in organ culture with quantitative cellular readout, single lab\",\n      \"pmids\": [\"22521888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of Robo2 in podocytes protects adult mice from glomerular injury and foot process effacement. ROBO2 expression in podocytes is upregulated after glomerular injury. Overexpression of ROBO2 in cultured mouse podocytes compromises cell adhesion.\",\n      \"method\": \"Conditional Robo2 KO (podocyte-specific), ultrastructural analysis, injury models (protamine sulfate, nephrotoxic serum), ROBO2 overexpression adhesion assay\",\n      \"journal\": \"American Journal of Pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with ultrastructural readout, injury rescue, and gain-of-function adhesion assay in cultured cells\",\n      \"pmids\": [\"32220420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ROBO2 is expressed in the common nephric duct (CND) and primitive bladder, and its novel binding partner retinaldehyde dehydrogenase-2 (RALDH2) mediates CND migration and fusion with the primitive bladder. Loss of Robo2 causes delayed apoptosis from failure of CND fusion, resulting in abnormal ureter connections. Retinoic acid rescues ureter anomalies in Robo2-/- embryos.\",\n      \"method\": \"Co-immunoprecipitation/binding assay identifying RALDH2 interaction, Robo2 knockout mouse, retinoic acid rescue experiment, apoptosis analysis\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — novel binding partner identified with functional KO phenotype and pharmacological rescue, single lab\",\n      \"pmids\": [\"32562756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The Slit-binding Ig1 domain of Robo2 is required for Robo2's midline repulsion activity, lateral axon pathway formation, and proper subcellular localization in Drosophila embryonic neurons in vivo. Robo2ΔIg1 fails to substitute for wild-type Robo2 in both midline repulsion and lateral pathway formation; removal of Ig1 disrupts proper subcellular localization of Robo2, a role not shared by the Ig1 domain of Robo1.\",\n      \"method\": \"CRISPR/Cas9 domain replacement (Robo2ΔIg1 knock-in), axon guidance assays, protein localization analysis\",\n      \"journal\": \"Genesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR-based endogenous domain replacement with multiple functional and localization readouts\",\n      \"pmids\": [\"34411419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Robo2 actively maintains adult pancreatic islet architecture in β cells. Conditional deletion of Robo2 in adult β cells causes significant loss of islet architecture without affecting β cell identity, maturation, or stress.\",\n      \"method\": \"Conditional Robo2 deletion in adult β cells, histological and immunofluorescence analysis of islet architecture\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with islet architecture readout, distinguishes developmental from maintenance function, single lab\",\n      \"pmids\": [\"37972678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CD47 stabilizes ROBO2 by sequestering the E3 ubiquitin ligase ITCH, thereby blocking ubiquitination and proteasomal degradation of ROBO2. Loss of ROBO2 similarly reduces GBM cell proliferation and migration. CD47 loss impairs GBM cell proliferation and migration in an immune-independent manner.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, ROBO2 knockdown/overexpression, in vivo tumor burden analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical mechanism (ubiquitin ligase sequestration) demonstrated with co-IP, ubiquitination assay, and in vivo tumor data\",\n      \"pmids\": [\"41871254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Robo2 and Gen1 co-regulate ureteric bud formation by activating the MAPK/ERK signaling pathway. Double disruption of Robo2 and Gen1 synergistically increases CAKUT phenotypes and ectopic UB formation. Robo2 and Gen1 exert synergistic effects on GDNF/RET pathway and downstream MAPK/ERK signaling to promote cell proliferation.\",\n      \"method\": \"Double-mutant mouse model (piggyBac transposon disruption), MAPK/ERK pathway analysis, GDNF/RET signaling measurements\",\n      \"journal\": \"Frontiers in Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — double-mutant synergistic phenotype with pathway analysis, single lab\",\n      \"pmids\": [\"35071283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In mouse spinal cord, Robo2 is the main receptor for directing axons within dorsal longitudinal tracts, and has a distinct function in repelling neuron cell bodies from the floor plate, distinct from Robo1 (which guides ventral tract axons and prevents midline crossing).\",\n      \"method\": \"Robo1 and Robo2 single KO mouse comparison, reduction-of-function genetics, longitudinal axon trajectory analysis\",\n      \"journal\": \"Developmental Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single KO and compound genetics distinguishing dorsal vs. ventral tract roles, single lab\",\n      \"pmids\": [\"21820427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Slit1b/2-Robo2 repulsive signaling in the amacrine cell layer is essential to initiate apical migration of horizontal cells during retinal lamination. Disruption of Robo2 causes basal retention of horizontal cells.\",\n      \"method\": \"Zebrafish CRISPR targeted screening, live imaging of horizontal cell migration, transcriptomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with live imaging readout, preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.07.23.666134\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Soluble TREM-1 (sTREM-1) acts as a ligand for ROBO2 in hippocampal neurons, and their interaction activates downstream ERK signaling. Knockdown of neuronal ROBO2 mitigated aging-related hippocampal synaptic degeneration and cognitive impairments. sTREM-1 reduced expression of synaptic proteins via the ROBO2/ERK pathway.\",\n      \"method\": \"In vivo ROBO2 knockdown in hippocampal neurons, ELISA, ERK pathway analysis, senescence accelerated mouse model\",\n      \"journal\": \"Molecular Neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO with pathway analysis, corroborated by earlier sTREM-1/Robo2 interaction findings in liver, single lab\",\n      \"pmids\": [\"42234329\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ROBO2 is a transmembrane receptor for SLIT ligands (SLIT1, SLIT2, SLIT3) that mediates repulsive axon guidance, cell migration, and tissue morphogenesis by signaling through downstream effectors including Rac1, RhoA, Cdc42, NCK, SRGAP1, and nonmuscle myosin IIA; in the kidney, SLIT2/ROBO2 restricts GDNF expression domain and nephrogenic mesenchyme field to position ureteric bud outgrowth and maintain the anti-reflux mechanism at the ureterovesical junction; in podocytes, ROBO2 forms a complex with nephrin via NCK, inhibiting actin polymerization and podocyte adhesion; ROBO2 also acts non-cell-autonomously (e.g., in Drosophila tendons to promote Slit cleavage, and in trans to inhibit Robo1 signaling), and can be regulated by ubiquitination (via ITCH, counteracted by CD47) and by its ectodomain conformation (which controls cryptic NELL1/2 binding in a pH-dependent manner).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ROBO2 is a single-pass transmembrane receptor for secreted SLIT ligands that transduces predominantly repulsive guidance cues to control axon pathfinding, cell migration, and epithelial tissue morphogenesis [#1, #30, #0]. In the nervous system it directs midline and post-crossing commissural axon guidance, dorsal longitudinal tract formation, olfactory and retinal axon targeting, dendrite branching, and target-selective nerve regeneration, often acting cell-autonomously through its SLIT-binding Ig1 domain [#1, #9, #10, #11, #30, #32, #36]. Downstream, SLIT-ROBO2 signaling reshapes the actin cytoskeleton via Rho-family GTPases — driving Rac1-dependent endothelial lamellipodia, RhoA-dependent myoblast migration, and Cdc42-dependent synaptic actin dynamics — and engages neuronal NADPH oxidase 2 to mediate growth cone collapse [#2, #18, #13, #29]. ROBO2 also performs non-canonical roles: it acts in trans to inhibit Robo1-mediated repulsion and promote midline crossing, and functions non-cell-autonomously in tendons to promote SLIT cleavage and in the epithelium as a stromal suppressor that restrains TGF-β/Wnt-driven myofibroblast activation [#6, #25, #15]. In the urogenital system, SLIT2/ROBO2 restricts the GDNF expression domain and nephrogenic mesenchyme field to position a single ureteric bud and maintain the anti-reflux ureterovesical junction, and ROBO2 disruption causes vesicoureteral reflux in mouse and human [#0, #3, #19, #20]. In podocytes ROBO2 assembles with nephrin via the adaptor NCK to inhibit actin polymerization and, through a SRGAP1/nonmuscle myosin IIA complex, destabilizes adhesion, so that ROBO2 loss protects against injury-induced foot process effacement [#4, #5, #34]. ROBO2 additionally binds non-SLIT ligands — NELL1/2 at a pH- and conformation-gated cryptic FNIII site, and soluble TREM-1 to activate Smad2/3, PI3K/Akt, and ERK signaling in hepatic stellate cells and neurons — and is regulated by alternative splicing, by Robo3.1A-driven lysosomal degradation, and by CD47-mediated sequestration of the E3 ligase ITCH that otherwise targets ROBO2 for ubiquitin-proteasome turnover [#16, #17, #22, #42, #26, #27, #38].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that ROBO2 is a bona fide SLIT receptor mediating axon repulsion, settling whether it functions alongside Robo1 in midline guidance.\",\n      \"evidence\": \"Drosophila single/double mutant epistasis showing robo,robo2 double mutants phenocopy slit\",\n      \"pmids\": [\"11163264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the distinct downstream effectors of Robo2 versus Robo1\", \"Vertebrate receptor specialization not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended ROBO2 function beyond neurons to epithelial morphogenesis by showing SLIT2/ROBO2 limits the GDNF domain to position a single ureteric bud.\",\n      \"evidence\": \"Slit2 and Robo2 knockout mice with in situ analysis of Gdnf\",\n      \"pmids\": [\"15130495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the signal acts by directly attenuating Gdnf or by limiting epithelial-mesenchymal interactions was unresolved\", \"Downstream effectors in mesenchyme unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked ROBO2 to human disease by showing dominant-negative ROBO2 abrogates signaling and Robo2 haploinsufficiency causes vesicoureteral reflux.\",\n      \"evidence\": \"Human de novo translocation, in vitro dominant-negative signaling assay, heterozygous Robo2 mice\",\n      \"pmids\": [\"17357069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting reflux to ureterovesical junction defect not yet defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined receptor-specific roles in vertebrate axon guidance, demonstrating ROBO2 (not Robo1) is the major intraretinal and olfactory targeting receptor and supports dendrite branching.\",\n      \"evidence\": \"Robo1 vs Robo2 single-KO mouse phenocopy comparisons, Xenopus knockdown/dominant-negative, chick gangliogenesis perturbation\",\n      \"pmids\": [\"19782674\", \"17715346\", \"19961927\", \"18278043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular effectors distinguishing Robo2 from Robo1 not identified\", \"How a single receptor partitions axon versus dendrite outputs unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed the cytoskeletal mechanism in podocytes by identifying a ROBO2-NCK-nephrin complex that inhibits actin polymerization.\",\n      \"evidence\": \"Co-IP, actin polymerization assay, Robo2 KO ultrastructure, Robo2/nephrin epistasis\",\n      \"pmids\": [\"22840396\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how actin inhibition translates to foot process architecture\", \"Adhesion machinery downstream not yet identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Uncovered non-canonical trans and ligand-processing roles, showing Robo2 can inhibit Robo1 in trans and acts non-signaling in tendons to promote Slit cleavage.\",\n      \"evidence\": \"Drosophila genetics, ectodomain binding, membrane-tethered Slit-N rescue\",\n      \"pmids\": [\"26186094\", \"26400093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of Robo2-Robo1 trans interaction not resolved\", \"Protease responsible for tendon Slit cleavage unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Mechanistically connected ROBO2 to adhesion by defining a ROBO2/SRGAP1/NMIIA complex that destabilizes podocyte attachment.\",\n      \"evidence\": \"Co-IP, direct interaction assays, focal adhesion and adhesion assays, podocyte-specific KO injury model\",\n      \"pmids\": [\"27882344\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SRGAP1 GAP activity feeds into myosin regulation in vivo not fully traced\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined ligand-gating and effector diversification: a cryptic pH-dependent NELL1/2 site, splice-isoform guidance switching, Cdc42-driven synaptic actin control, and a Baiap2-MDM2-p53 epithelial survival axis.\",\n      \"evidence\": \"Binding/mutagenesis assays, NOVA splice analysis with guidance assays, zebrafish actin imaging with DN-Cdc42, Robo2/p53 double-KO epistasis\",\n      \"pmids\": [\"30700556\", \"31392959\", \"31180321\", \"31534052\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger unmasking the NELL1/2 site in vivo unclear\", \"Whether NELL ligands compete with SLIT functionally not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified soluble TREM-1 as a non-SLIT ligand and a trans-synaptic Neurexin partner, broadening ROBO2 ligand repertoire and synaptogenic function.\",\n      \"evidence\": \"Pull-down/mass spectrometry, trans-synaptic binding assays, conditional KO with circuit imaging, regeneration imaging\",\n      \"pmids\": [\"34750987\", \"34686348\", \"34916258\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of sTREM-1 and Neurexin binding to ROBO2 not defined\", \"Whether these ligands signal through the same intracellular routes as SLIT unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the conformational logic for ligand gating, showing the ectodomain shifts from extended to compact under acidic pH to expose the NELL1/2 site.\",\n      \"evidence\": \"FRET conformational sensors, size exclusion chromatography, isoform binding affinities\",\n      \"pmids\": [\"35940226\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"FRET-based conformational model awaits high-resolution structural confirmation\", \"In vivo relevance of acidic-pH gating not demonstrated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established post-translational stability control, showing CD47 sequesters the E3 ligase ITCH to block ROBO2 ubiquitination and support tumor cell proliferation.\",\n      \"evidence\": \"Co-IP, ubiquitination and proteasome assays, knockdown/overexpression, in vivo tumor burden\",\n      \"pmids\": [\"41871254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ITCH ubiquitination site on ROBO2 not mapped\", \"Whether this regulation operates outside glioblastoma not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse ligand inputs (SLIT, NELL1/2, sTREM-1, Neurexin) and effector branches (Rac1, RhoA, Cdc42, NCK/nephrin, SRGAP1/NMIIA, Nox2, Baiap2/MDM2) are selected in a given cell type to yield repulsion versus adhesion versus survival outputs remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model of ROBO2 signal selection across tissues\", \"Cytoplasmic domain interactions linking ligand engagement to each effector branch incompletely mapped\", \"Structural basis of receptor activation by SLIT not in corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 30, 12]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4, 13, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [16, 36, 12]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 4, 30]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 19, 20]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [10, 12, 32]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [38, 27]}\n    ],\n    \"complexes\": [\n      \"ROBO2/NCK/nephrin complex\",\n      \"ROBO2/SRGAP1/NMIIA complex\"\n    ],\n    \"partners\": [\n      \"SLIT1\",\n      \"SLIT2\",\n      \"NCK\",\n      \"SRGAP1\",\n      \"NELL1\",\n      \"BAIAP2\",\n      \"ITCH\",\n      \"CD47\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}