Subtopic Deep Dive
Eph Receptor Mediated Axon Repulsion
Research Guide
What is Eph Receptor Mediated Axon Repulsion?
Eph receptor mediated axon repulsion is the process where Eph receptors on growth cones bind ephrin ligands, triggering signaling cascades that cause growth cone collapse and axon retraction to establish topographic neural maps.
Eph-ephrin interactions provide contact-dependent repulsion essential for axon pathfinding in the retinotectal system (Drescher et al., 1995; 850 citations). Downstream Rho GTPases mediate cytoskeletal changes leading to repulsion (Govek et al., 2005; 992 citations). Regulated ephrin cleavage enables rapid axon detachment post-repulsion (Hattori et al., 2000; 515 citations).
Why It Matters
Eph-mediated repulsion defects disrupt topographic mapping, contributing to neurodevelopmental disorders like autism spectrum disorders. Adams et al. (1999; 1026 citations) showed EphB-ephrinB signaling demarcates domains critical for neural and vascular patterning, with implications for regenerative therapies targeting spinal cord injuries. Govek et al. (2005; 992 citations) linked Rho GTPase dysregulation in Eph signaling to neuronal circuit malformations, informing drug targets for neurorepair. Kolodkin and Tessier-Lavigne (2010; 640 citations) outlined how Eph repulsion integrates with other cues for precise wiring, essential for vision restoration strategies.
Key Research Challenges
Ephrin Cleavage Mechanisms
Axons must detach rapidly from high-affinity Eph-ephrin complexes to avoid stalling. Hattori et al. (2000; 515 citations) identified metalloprotease-mediated ephrin-B cleavage as key, but regulation in vivo remains unclear. Temporal control of cleavage impacts repulsion efficiency in dynamic environments.
Rho GTPase Pathway Specificity
Eph signals activate RhoA for repulsion but Rac1 for attraction, requiring precise balance. Govek et al. (2005; 992 citations) detailed Rho GTPase roles in growth cone dynamics, yet cross-talk with other pathways confounds specificity. This challenges modeling of topographic mapping.
In Vivo Topographic Mapping
In vitro repulsion does not fully replicate in vivo gradient effects on retinal axons. Drescher et al. (1995; 850 citations) demonstrated RAGS-guided repulsion, but integrating with netrin/Slit cues in 3D tissues is unresolved. Nakamoto et al. (1996; 419 citations) showed ELF-1 topographic effects needing in vivo validation.
Essential Papers
Roles of ephrinB ligands and EphB receptors in cardiovascular development: demarcation of arterial/venous domains, vascular morphogenesis, and sprouting angiogenesis
Ralf H. Adams, George A. Wilkinson, Chana Weiss et al. · 1999 · Genes & Development · 1.0K citations
Eph receptor tyrosine kinases and their cell-surface-bound ligands, the ephrins, regulate axon guidance and bundling in the developing brain, control cell migration and adhesion, and help patternin...
The role of the Rho GTPases in neuronal development
Eve-Ellen Govek, Sarah E. Newey, Linda Van Aelst · 2005 · Genes & Development · 992 citations
Our brain serves as a center for cognitive function and neurons within the brain relay and store information about our surroundings and experiences. Modulation of this complex neuronal circuitry al...
In vitro guidance of retinal ganglion cell axons by RAGS, a 25 kDa tectal protein related to ligands for Eph receptor tyrosine kinases
Uwe Drescher, Claus Kremoser, Claudia Handwerker et al. · 1995 · Cell · 850 citations
Mechanisms and Molecules of Neuronal Wiring: A Primer
Alex L. Kolodkin, Marc Tessier‐Lavigne · 2010 · Cold Spring Harbor Perspectives in Biology · 640 citations
The complex patterns of neuronal wiring in the adult nervous system depend on a series of guidance events during neural development that establish a framework on which functional circuits can be bu...
Regulated Cleavage of a Contact-Mediated Axon Repellent
Mitsuharu Hattori, Miriam Osterfield, John G. Flanagan · 2000 · Science · 515 citations
Contact-mediated axon repulsion by ephrins raises an unresolved question: these cell surface ligands form a high-affinity multivalent complex with their receptors present on axons, yet rather than ...
PDZ interaction site in ephrinB2 is required for the remodeling of lymphatic vasculature
Taija Mäkinen, Ralf H. Adams, J. S. Bailey et al. · 2005 · Genes & Development · 455 citations
The transmembrane ligand ephrinB2 and its cognate Eph receptor tyrosine kinases are important regulators of embryonic blood vascular morphogenesis. However, the molecular mechanisms required for ep...
In vivo cell sorting in complementary segmental domains mediated by Eph receptors and ephrins
Qiling Xu, Georg Mellitzer, Vicky Robinson et al. · 1999 · Nature · 424 citations
Reading Guide
Foundational Papers
Start with Drescher et al. (1995; 850 citations) for in vitro RAGS repulsion assay establishing Eph-ephrin role, then Govek et al. (2005; 992 citations) for Rho GTPase mechanisms, and Hattori et al. (2000; 515 citations) for cleavage resolving adhesion paradox.
Recent Advances
Kolodkin and Tessier-Lavigne (2010; 640 citations) primer integrates Eph into wiring mechanisms. Lisabeth et al. (2013; 423 citations) reviews Eph signaling features. Hall and Lalli (2010; 424 citations) details Rho/Ras in guidance.
Core Methods
Stripe assays (Drescher 1995), growth cone collapse assays (Govek 2005), metalloprotease cleavage assays (Hattori 2000), and in vivo retinal mapping (Nakamoto 1996).
How PapersFlow Helps You Research Eph Receptor Mediated Axon Repulsion
Discover & Search
Research Agent uses searchPapers('Eph receptor axon repulsion Rho GTPases') to find core papers like Govek et al. (2005), then citationGraph reveals downstream citations from Drescher et al. (1995; 850 citations), and findSimilarPapers expands to Rho pathway analogs; exaSearch queries 'Eph-ephrin cleavage in vivo' for recent extensions.
Analyze & Verify
Analysis Agent applies readPaperContent on Hattori et al. (2000) to extract cleavage kinetics data, verifyResponse with CoVe cross-checks claims against Govek et al. (2005), and runPythonAnalysis simulates Rho GTPase activation curves using pandas/matplotlib for statistical verification; GRADE scores evidence strength for pathway integration.
Synthesize & Write
Synthesis Agent detects gaps in cleavage timing via contradiction flagging across Adams et al. (1999) and Hattori et al. (2000), while Writing Agent uses latexEditText for pathway diagrams, latexSyncCitations to bibtex Adams/Govek, and latexCompile for publication-ready reviews; exportMermaid generates Eph-Rho signaling flowcharts.
Use Cases
"Analyze Rho GTPase activation kinetics in Eph repulsion from Govek 2005"
Analysis Agent → readPaperContent(Govek et al., 2005) → runPythonAnalysis(pandas curve fitting on activation data) → matplotlib plot of RhoA vs Rac1 dynamics with statistical p-values.
"Write LaTeX review of Eph-ephrin repulsion mechanisms"
Synthesis Agent → gap detection(Adams 1999, Hattori 2000) → Writing Agent → latexEditText(intro section) → latexSyncCitations(5 papers) → latexCompile(PDF review with Eph signaling figure).
"Find code for simulating Eph gradient repulsion"
Research Agent → paperExtractUrls(Drescher 1995 analogs) → paperFindGithubRepo → githubRepoInspect → runPythonAnalysis(adapt simulation code for Rho GTPase model output).
Automated Workflows
Deep Research workflow scans 50+ Eph papers via searchPapers → citationGraph(Adams 1999 hub) → structured report on repulsion pathways. DeepScan's 7-step chain verifies Govek (2005) Rho claims with CoVe checkpoints and runPythonAnalysis. Theorizer generates hypotheses on cleavage timing gaps from Hattori (2000) integrated with in vivo data.
Frequently Asked Questions
What defines Eph receptor mediated axon repulsion?
Eph receptors on axons bind ephrin ligands on target cells, activating repulsion via growth cone collapse (Drescher et al., 1995). Rho GTPases drive cytoskeletal contraction (Govek et al., 2005).
What are key methods in Eph repulsion studies?
In vitro stripe assays test repulsion by RAGS/ELF-1 gradients (Drescher et al., 1995; Nakamoto et al., 1996). Biochemical assays measure ephrin cleavage (Hattori et al., 2000).
What are foundational papers?
Drescher et al. (1995; Cell, 850 citations) identified tectal RAGS for retinal axon guidance. Govek et al. (2005; 992 citations) detailed Rho GTPases. Hattori et al. (2000; 515 citations) showed ephrin cleavage.
What are open problems?
In vivo integration of Eph repulsion with attractive cues remains unclear (Kolodkin and Tessier-Lavigne, 2010). Specificity of RhoA vs Rac1 in gradients needs resolution (Govek et al., 2005).
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