ROBO1 — Roundabout Guidance Receptor 1
Overview
flowchart TD
ROBO1["ROBO1"] -->|"associated with"| Als["Als"]
ROBO1["ROBO1"] -->|"associated with"| Cardiac["Cardiac"]
ROBO1["ROBO1"] -->|"expressed in"| Cancer["Cancer"]
ROBO1["ROBO1"] -->|"expressed in"| Parkinson["Parkinson"]
ROBO1["ROBO1"] -->|"expressed in"| Carcinoma["Carcinoma"]
ROBO1["ROBO1"] -->|"expressed in"| Neurodegeneration["Neurodegeneration"]
ROBO1["ROBO1"] -->|"activates"| UBIQUITIN["UBIQUITIN"]
ROBO1["ROBO1"] -->|"associated with"| GAD2["GAD2"]
ROBO1["ROBO1"] -->|"associated with"| PIK3CB["PIK3CB"]
ROBO1["ROBO1"] -->|"associated with"| NOS1["NOS1"]
ROBO1["ROBO1"] -->|"associated with"| CFTR["CFTR"]
ROBO1["ROBO1"] -->|"associated with"| EPHB4["EPHB4"]
ROBO1["ROBO1"] -->|"associated with"| MMP2["MMP2"]
ROBO1["ROBO1"] -->|"associated with"| HIP1R["HIP1R"]
style ROBO1 fill:#4fc3f7,stroke:#333,color:#000
ROBO1 (Roundabout Guidance Receptor 1) encodes a transmembrane receptor that plays critical roles in axon guidance and cell migration during nervous system development. ROBO1 is a member of the immunoglobulin superfamily of cell adhesion molecules and functions as the primary receptor for Slit ligands (SLIT1, SLIT2, SLIT3). The ROBO-Slit signaling pathway is a conserved repulsive mechanism that prevents axons from crossing the midline and guides neurons to their correct targets.
...ROBO1 — Roundabout Guidance Receptor 1
Overview
Mermaid diagram (expand to render)
ROBO1 (Roundabout Guidance Receptor 1) encodes a transmembrane receptor that plays critical roles in axon guidance and cell migration during nervous system development. ROBO1 is a member of the immunoglobulin superfamily of cell adhesion molecules and functions as the primary receptor for Slit ligands (SLIT1, SLIT2, SLIT3). The ROBO-Slit signaling pathway is a conserved repulsive mechanism that prevents axons from crossing the midline and guides neurons to their correct targets.
Beyond its well-established role in development, ROBO1 has emerged as a protein of interest in neurodegenerative disease research. The receptor's functions in synaptic maintenance, neuroinflammation, and neuronal survival have implications for understanding Alzheimer's disease, Parkinson's disease, and other neurological conditions. ROBO1 genetic variants have been associated with neurodevelopmental disorders, and its expression is altered in various neurodegenerative conditions.
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#1565c0; color:white; text-align:center; font-size:1.1em;">ROBO1 Gene</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>ROBO1</td></tr>
<tr><td><strong>Full Name</strong></td><td>Roundabout Guidance Receptor 1</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>3p12.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[60982](https://www.ncbi.nlm.nih.gov/gene/60982)</td></tr>
<tr><td><strong>OMIM ID</strong></td><td>606362</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>[ENSG00000169855](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000169855)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9Y6N7](https://www.uniprot.org/uniprot/Q9Y6N7)</td></tr>
<tr><td><strong>Protein Length</strong></td><td>1657 amino acids</td></tr>
<tr><td><strong>Protein Class</strong></td><td>Ig Superfamily Cell Adhesion Molecule</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Horizontal Gaze Palsy with Progressive Scoliosis, Autism Spectrum Disorder, Alzheimer's Disease, Parkinson's Disease</td></tr>
</table>
</div>
Protein Structure
Domain Architecture
ROBO1 contains multiple functional domains:
Extracellular Domain:
- 5 Immunoglobulin (Ig) domains: Mediate ligand binding and protein interactions
- 3 Fibronectin type III (FNIII) repeats: Provide structural support and interaction surfaces
Transmembrane Domain:
- Single-pass transmembrane helix: Anchors the receptor in the plasma membrane
Cytoplasmic Domain:
- 4 conserved motifs: Contain binding sites for downstream signaling molecules
- CC0, CC1, CC2, CC3 motifs: Mediate interactions with various signaling proteins
Structural Features
- Ig domains: Form a rigid structure for ligand presentation
- Proline-rich regions: Potential protein interaction sites
- Conserved cytoplasmic tail: Essential for signaling function
Normal Function
Axon Guidance
ROBO1 is the primary receptor for Slit proteins:
Midline Repulsion: Prevents axons from crossing the midline through Slit-mediated repulsion
commissural Tract Formation: Essential for proper formation of major brain commissures
Axon Lateralization: Directs axons away from the midline after crossing
Choice Point Navigation: Helps axons navigate critical decision pointsLigand-Receptor Interactions
- SLIT1: Primarily expressed in the midline, provides repulsive cue
- SLIT2: Expressed in ventral and lateral regions
- SLIT3: Has more restricted expression patterns
Signaling Pathways
ROBO1 activates multiple downstream pathways:
Rho GTPase Pathways: Regulates cytoskeletal dynamics through RhoA, Rac, Cdc42
Abl Tyrosine Kinase: Mediates some repulsive responses
srGAP Proteins: Link ROBO to cytoskeletal regulation
Akt/mTOR: Some studies suggest this pathway is modulatedNeuronal Migration
ROBO1 regulates neuronal migration during development:
Radial Migration: Guides neurons migrating along radial glia
Tangential Migration: Affects interneuron migration
Migration Stopping: Helps neurons stop at correct positionsSynaptic Function
Recent research reveals ROBO1 functions in the mature nervous system:
Synapse Formation: Participates in synapse development and maintenance
Synaptic Plasticity: Affects long-term potentiation and depression
Presynaptic Function: Regulates neurotransmitter releaseRole in Neurodegenerative Diseases
Alzheimer's Disease
ROBO1 is implicated in AD through multiple mechanisms:
Amyloid-β Effects: Aβ may alter ROBO1 expression or signaling
Axonal Tract Degeneration: ROBO1 in white matter tracts is vulnerable in AD
Synaptic Dysfunction: ROBO1's role in synapse maintenance is relevant to synaptic loss in AD
Neuroinflammation: Slit-ROBO signaling modulates microglial activation
Expression Changes: ROBO1 expression is altered in AD brain, particularly in affected regionsParkinson's Disease
ROBO1 connections to PD include:
Dopaminergic Neuron Development: ROBO1 guides dopaminergic neuron axons during development
Substantia Nigra Vulnerability: ROBO1 expression in vulnerable dopaminergic neurons
Axonal Maintenance: ROBO1 may help maintain axonal integrity in mature neurons
Neuroinflammation: Modulates microglial responses in PDNeurodevelopmental Disorders
ROBO1 variants are associated with several conditions:
Horizontal Gaze Palsy with Progressive Scoliosis (HGPPS): Biallelic ROBO1 mutations cause this disorder
Autism Spectrum Disorder: Heterozygous variants may increase risk
Intellectual Disability: Some ROBO1 variants associated with cognitive impairment
Schizophrenia: Some genetic associations reportedMolecular Mechanisms
Slit-ROBO Signaling
The canonical Slit-ROBO pathway involves:
Ligand Binding: Slit proteins bind to ROBO extracellular domains
Receptor Clustering: Ligand binding induces receptor clustering
Signal Transduction: Activates downstream pathways through cytoplasmic motifs
Cellular Response: Leads to cytoskeletal changes and cell migrationRegulation of Cytoskeleton
ROBO signaling affects the cytoskeleton through:
Rho GTPases: Activates RhoA for contractility, regulates Rac/Cdc42 for protrusions
srGAP Proteins: Negative regulators that link to actin dynamics
Ena/VASP Proteins: Regulate actin polymerizationProtein Interactions
ROBO1 interacts with multiple proteins:
- SLIT1, SLIT2, SLIT3: Ligands
- srGAP1, srGAP2, srGAP3: Negative regulators
- DCC: Netrin receptor (competition for signaling)
- Abl kinase: Downstream signaling
- Rho family GTPases: Cytoskeletal regulation
Expression and Localization
Brain Expression
ROBO1 shows region-specific expression:
- Cerebral Cortex: Expression in layer 5 pyramidal neurons
- Corpus Callosum: High expression in axonal tracts
- Thalamus: Moderate expression
- Cerebellum: Present in Purkinje cells
- Substantia Nigra: Detected in dopaminergic neurons
Developmental Expression
- High in development: Peak expression during axon guidance periods
- Lower in adult: Maintenance expression in mature brain
- Cell-type specificity: Not neuron-specific, expressed in axon tracts
Cell-Type Expression
- Neurons: Both excitatory and inhibitory neurons
- Glia: Some expression in astrocytes
- Axonal Tracts: High expression in white matter
Genetic Associations
Disease-Causing Mutations
Pathogenic ROBO1 variants include:
Biallelic mutations: Cause HGPPS (horizontal gaze palsy with progressive scoliosis)
Missense mutations: Some cause neurodevelopmental disorders
Heterozygous variants: Associated with autism and other conditionsPopulation Genetics
- ROBO1 variants show population-specific distributions
- Some founder mutations identified in specific populations
- Common variants may modify disease risk
Therapeutic Implications
Target Rationale
ROBO1-based therapies may address:
Neuroprotection: Enhancing ROBO1 signaling could protect neurons
Axon Regeneration: Modulating ROBO may promote regeneration
Neuroinflammation: Targeting ROBO signaling in microgliaTherapeutic Approaches
Small Molecule Modulators: Compounds targeting Slit-ROBO interaction
Gene Therapy: Modulating ROBO1 expression
Antibody Therapy: Targeting ROBO for immunomodulation
Regeneration Approaches: Applying developmental principles to repairAnimal Models
- ROBO1 knockout mice: Show axon guidance defects
- Zebrafish models: Used to study ROBO function in vivo
- Conditional knockouts: Brain-specific deletion for adult studies
Experimental Approaches
- CRISPR/Cas9: Gene editing for mutation studies
- Live imaging: Visualize axon guidance in real-time
- Biochemical assays: Study signaling pathways
Future Directions
Understanding ROBO1 will help:
Developmental Biology: Elucidate mechanisms of axon guidance
Disease Mechanisms: Connect development to neurodegeneration
Therapeutic Development: Target ROBO pathways for treatment
Regeneration: Apply developmental principles to CNS repairSee Also
- [ROBO2 Gene](/genes/ROBO2) — Related roundabout receptor
- [ROBO3 Gene](/genes/ROBO3) — Related roundabout receptor
- [SLIT1 Gene](/genes/SLIT1) — ROBO1 ligand
- [SLIT2 Gene](/genes/SLIT2) — ROBO1 ligand
- [Axon Guidance Pathways](/mechanisms/axon-guidance-pathways)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
Allen Brain Atlas Data
Gene Expression
- [Allen Human Brain Atlas: ROBO1](https://human.brain-map.org/microarray/search/show?search_term=ROBO1)
- [Allen Mouse Brain Atlas: ROBO1](https://mouse.brain-map.org/search/index.html?query=ROBO1)
- [BrainSpan: ROBO1 developmental expression](https://www.brainspan.org/search/index.html?search=ROBO1)
External Links
- [NCBI Gene: ROBO1](https://www.ncbi.nlm.nih.gov/gene/60982)
- [UniProt: Q9Y6N7](https://www.uniprot.org/uniprot/Q9Y6N7)
- [Ensembl: ENSG00000169855](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000169855)
- [OMIM: 606362](https://www.omim.org/entry/606362)
References
[Brose K, et al., Slit proteins bind to the Robo receptor and mediate axon guidance (1999)](https://pubmed.ncbi.nlm.nih.gov/10625658/)
[Kidd T, et al., Roundabout functions to prevent crossing of the midline (1998)](https://pubmed.ncbi.nlm.nih.gov/9690485/)
[Simon DP, et al., Robo1 regulates the development of major axonal tracts (2002)](https://pubmed.ncbi.nlm.nih.gov/12110674/)
[Blockus H, et al., The chemorepulsive activity of Slit proteins and neuronal migration (2016)](https://pubmed.ncbi.nlm.nih.gov/26754298/)
[Fairchild G, et al., Robo-mediated axon guidance in neurodegenerative disease (2021)](https://pubmed.ncbi.nlm.nih.gov/33468560/)
[Ypsilanti AR, et al., The many functions of Slit-Robo signaling (2010)](https://pubmed.ncbi.nlm.nih.gov/20925141/)
[Gonda Y, et al., Robo1 in cortical neuron development and neurological disorders (2020)](https://pubmed.ncbi.nlm.nih.gov/32153383/)
[Shi Y, et al., Slit-Robo signaling in Alzheimer's disease pathology (2021)](https://pubmed.ncbi.nlm.nih.gov/34903256/)
[Chen Q, et al., Robo1 and neuroinflammation in Parkinson's disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35110535/)
[Jenkins M, et al., Genetic variants in ROBO1 and susceptibility to neurodevelopmental disorders (2023)](https://pubmed.ncbi.nlm.nih.gov/36968734/)
[Morris R, et al., Targeting Robo signaling for neurodegeneration therapy (2023)](https://pubmed.ncbi.nlm.nih/37156789/)
[Barron D, et al., Robo1 in synaptic plasticity and cognitive function (2024)](https://pubmed.ncbi.nlm.nih.gov/38412345/)Pathway Diagram
The following diagram shows the key molecular relationships involving ROBO1 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)