GO:0097379 dorsal spinal cord interneuron posterior axon guidance: Axon Guidance Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0097379 describes the directed migration of an axon growth cone from a dorsal spinal cord interneuron toward a posterior target along the anterior-posterior body axis, driven by a balance of attractive and repulsive cues.
• The process is a specialized form of axon guidance that occurs in the dorsal spinal cord, where roof plate-derived signals and midline-derived cues cooperate to pattern commissural and ascending/descending projections.
• Key molecular players include EphrinB3/EphA4 signaling, which guides ascending and descending spinal tracts, and the cell adhesion molecule MDGA2, which is required for rostral growth of commissural axons.
• Ventral midline cells provide local control of commissural axon guidance, and roof plate-dependent patterning establishes the dorsal central nervous system environment necessary for correct posterior projection.
• Dysregulation of axon guidance mechanisms is linked to spinal cord injury, developmental axon pathfinding disorders, and altered neural circuit formation, making this term relevant to neurodevelopmental and regenerative research.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of candidate guidance genes in dorsal spinal cord interneuron posterior axon guidance.
Description
GO:0097379, dorsal spinal cord interneuron posterior axon guidance, is a biological process that defines how the axon growth cone of a dorsal spinal cord interneuron is directed to a specific target site in the posterior direction along the anterior-posterior body axis in response to a combination of attractive and repulsive cues. This term captures a critical step in neural circuit assembly, where spatial information encoded by guidance molecules is translated into directional axon extension within the developing spinal cord. Understanding this process is essential for researchers studying spinal cord development, sensorimotor circuit formation, and axon regeneration after injury. The dorsal spinal cord contains diverse interneuron populations whose axons must navigate complex environments to reach appropriate targets, and posterior guidance is one of the directional decisions they make. Disruption of these guidance events can lead to miswiring, altered sensory processing, and impaired locomotor function, underscoring the importance of identifying the molecular cues and receptors involved. This article integrates the QuickGO definition with verified PubMed literature to provide a research-grade overview of the genes, mechanisms, and experimental models used to study GO:0097379.
dorsal spinal cord interneuron posterior axon guidance At A Glance
| GO ID | GO:0097379 |
|---|---|
| GO term | dorsal spinal cord interneuron posterior axon guidance |
| Ontology | biological_process |
| Synonym | dorsal interneuron caudal axon projection |
| Major function | Directed migration of a dorsal spinal cord interneuron axon growth cone to a posterior target along the anterior-posterior axis in response to attractive and repulsive cues |
| Directionality | Posterior (caudal) along the anterior-posterior body axis |
| Cell type | Dorsal spinal cord interneuron |
| Key cue types | Attractive and repulsive guidance cues, including Ephrin/Eph and cell adhesion molecules |
| Related processes | Commissural axon guidance, roof plate-dependent dorsal patterning, ascending and descending spinal tract guidance |
What Is GO:0097379?
In simple terms, GO:0097379 describes the process by which an axon from a dorsal spinal cord interneuron is steered toward the posterior end of the body axis. More formally, it is the directed migration of an axon growth cone to a specific posterior target site along the anterior-posterior axis, guided by a combination of attractive and repulsive cues. The anterior-posterior axis runs from the head to the tail, and posterior guidance ensures that axons project in the correct caudal direction within the developing spinal cord. This process is distinct from general axon guidance because it is spatially restricted to dorsal spinal cord interneurons and directionally restricted to the posterior axis.
Why Is dorsal spinal cord interneuron posterior axon guidance Important in Cell Biology?
GO:0097379 is important because correct posterior guidance of dorsal spinal cord interneuron axons is required for assembling functional spinal circuits that relay sensory and motor information. Errors in this process can cause miswiring of ascending and descending tracts, contributing to developmental neurological disorders and impairing recovery after spinal cord injury. Studying this term helps researchers identify the molecular cues, receptors, and intracellular signaling pathways that control directional axon growth, which are candidate targets for regenerative therapies.
• Defines a specific directional axon guidance event essential for spinal cord circuit formation.
• Involves EphrinB3/EphA4 signaling, a well-characterized guidance axis for ascending and descending spinal tracts.
• Requires ventral midline cells for local control of commissural axon guidance, linking midline signaling to posterior projection.
• Depends on roof plate-dependent patterning of the dorsal central nervous system, which establishes the guidance environment.
• Involves the cell adhesion molecule MDGA2 for rostral growth of commissural axons, highlighting adhesion molecules in directional guidance.
• Relevant to spinal cord injury and axon regeneration research, where re-establishing correct posterior projections is a therapeutic goal.
• Provides a framework for studying attractive versus repulsive cue integration at the growth cone.
• Supports development of CRISPR-based models to test candidate guidance genes causally.
• Connects to neurodevelopmental disorders characterized by abnormal axon pathfinding and circuit connectivity.
• Offers a tractable system for live imaging and genetic perturbation in vertebrate embryos.
What Happens During dorsal spinal cord interneuron posterior axon guidance?
Specification of dorsal spinal cord interneurons
In simple terms: First, cells in the dorsal spinal cord are instructed to become interneurons that will send axons toward the posterior.
Dorsal spinal cord interneurons are specified by roof plate-dependent patterning signals that establish dorsal identity in the vertebrate central nervous system. This patterning creates a population of interneurons whose axons must navigate along the anterior-posterior axis. The roof plate acts as a signaling center that influences the dorsal neural tube, and disruption of this patterning alters the guidance environment for dorsal axons. Ventral midline cells also contribute to the local control of commissural axon guidance, indicating that both dorsal and ventral signaling centers cooperate to shape axon trajectories.
Growth cone extension and directional sensing
In simple terms: The tip of the growing axon, called the growth cone, extends and samples the environment to decide which way to go.
The axon growth cone of a dorsal spinal cord interneuron migrates to a specific posterior target site in response to a combination of attractive and repulsive cues. This directional sensing requires the growth cone to integrate multiple signals simultaneously, including guidance molecules and adhesion cues. EphrinB3/EphA4-mediated signaling guides ascending and descending spinal tracts, demonstrating that Ephrin/Eph interactions provide directional information in the spinal cord. The cell adhesion molecule MDGA2 is required for rostral growth of commissural axons, showing that adhesion molecules can bias growth cone direction.
Integration of attractive and repulsive cues
In simple terms: The growth cone balances signals that pull it forward and signals that push it away to choose the posterior direction.
Posterior axon guidance depends on the combined action of attractive and repulsive cues that define the anterior-posterior axis. Ventral midline cells are required for the local control of commissural axon guidance, providing a source of cues that influence growth cone behavior. Roof plate-dependent patterning establishes the dorsal central nervous system environment that shapes the distribution of guidance cues. The integration of these cues ensures that dorsal spinal cord interneuron axons project posteriorly rather than anteriorly or laterally.
Target recognition and synapse formation
In simple terms: Once the axon reaches the correct posterior target, it stops and begins to form connections.
The endpoint of dorsal spinal cord interneuron posterior axon guidance is the directed migration of the growth cone to a specific target site in the posterior direction. Correct target recognition is essential for forming functional spinal circuits that relay sensory and motor information. EphrinB3/EphA4 signaling guides ascending and descending spinal tracts, which are critical for sensorimotor function. MDGA2-dependent rostral growth of commissural axons illustrates how adhesion molecules contribute to precise targeting.
Role of midline and roof plate signaling centers
In simple terms: Two signaling centers, one at the midline and one at the roof plate, help organize the guidance cues.
Ventral midline cells are required for the local control of commissural axon guidance in the mouse spinal cord, highlighting the midline as a key signaling center. Roof plate-dependent patterning of the vertebrate dorsal central nervous system establishes the dorsal environment through which dorsal interneuron axons navigate. Together, these signaling centers create a landscape of attractive and repulsive cues that direct posterior axon projection. Disruption of either center can alter guidance decisions and lead to miswiring.
Key Genes Involved in GO:0097379 dorsal spinal cord interneuron posterior axon guidance
The following genes and proteins have been implicated in dorsal spinal cord interneuron posterior axon guidance and related spinal axon guidance processes based on verified PubMed literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EphrinB3 | Guidance cue for ascending and descending spinal tracts | Studied in EphrinB3/EphA4-mediated guidance of spinal tracts |
| EphA4 | Receptor mediating EphrinB3-dependent guidance | Studied in EphrinB3/EphA4-mediated guidance of spinal tracts |
| MDGA2 | Cell adhesion molecule required for rostral growth of commissural axons | Studied in commissural axon guidance |
| Roof plate-derived signals | Patterning of the dorsal central nervous system | Studied in roof plate-dependent dorsal CNS patterning |
| Ventral midline cell-derived cues | Local control of commissural axon guidance | Studied in mouse spinal cord commissural axon guidance |
| Commissural axon guidance molecules | Direct commissural axon trajectories | Studied in ventral midline-dependent guidance |
| Dorsal interneuron specification genes | Establish dorsal interneuron identity | Studied in roof plate-dependent patterning |
| Ephrin/Eph family members | Attractive and repulsive guidance cues | Studied in spinal tract guidance |
| Cell adhesion molecules | Modulate growth cone adhesion and directionality | Studied in commissural axon growth |
| Guidance cue receptors | Transduce attractive and repulsive signals | Studied in spinal axon guidance |
| Midline signaling molecules | Provide local guidance cues | Studied in commissural axon guidance |
| Roof plate signaling molecules | Pattern the dorsal neural tube | Studied in dorsal CNS patterning |
| Growth cone cytoskeletal regulators | Mediate growth cone turning | Implied by guidance studies |
| Axon guidance transcription factors | Regulate expression of guidance molecules | Implied by patterning studies |
| Commissural neuron guidance receptors | Receive midline-derived cues | Studied in commissural axon guidance |
| Spinal tract guidance molecules | Guide ascending and descending tracts | Studied in EphrinB3/EphA4 guidance |
How Is dorsal spinal cord interneuron posterior axon guidance Regulated?
Regulation of dorsal spinal cord interneuron posterior axon guidance involves the spatial and temporal expression of guidance cues and their receptors, which is controlled by patterning signals from the roof plate and ventral midline. EphrinB3/EphA4 signaling provides a regulated guidance axis for ascending and descending spinal tracts. The cell adhesion molecule MDGA2 is required for rostral growth of commissural axons, indicating that adhesion molecule activity is also regulated during guidance. Ventral midline cells exert local control over commissural axon guidance, suggesting that midline-derived signals dynamically regulate growth cone behavior. Roof plate-dependent patterning establishes the dorsal environment that influences the distribution and activity of guidance cues.
dorsal spinal cord interneuron posterior axon guidance and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EphrinB3 | Spinal cord injury and abnormal spinal tract guidance | Knockout mouse or CRISPR knockout in spinal cord neurons |
| EphA4 | Spinal cord injury and abnormal spinal tract guidance | Point-mutation or knockout models to test receptor function |
| MDGA2 | Abnormal commissural axon pathfinding | Knockout or knockdown models in commissural neurons |
| Roof plate signaling genes | Neurodevelopmental dorsal CNS patterning defects | Conditional knockout or overexpression in dorsal neural tube |
| Ventral midline signaling genes | Commissural axon miswiring | Knockout or knock-in models in mouse spinal cord |
Spinal cord injury and axon regeneration
Axon guidance mechanisms such as those mediated by EphrinB3/EphA4 are relevant to spinal cord injury because they influence the growth of ascending and descending spinal tracts. After injury, the same guidance cues that pattern development can inhibit or redirect axon regeneration, making them candidate targets for therapeutic intervention. Understanding posterior axon guidance in dorsal spinal cord interneurons may inform strategies to promote correct reconnection of spinal circuits.
Neurodevelopmental axon pathfinding disorders
Disruption of roof plate-dependent patterning of the dorsal central nervous system can alter the guidance environment and lead to abnormal axon trajectories. Ventral midline cells are required for local control of commissural axon guidance, and defects in midline signaling are associated with miswiring of commissural axons. The cell adhesion molecule MDGA2 is required for rostral growth of commissural axons, linking adhesion molecule dysfunction to abnormal axon pathfinding. These findings suggest that errors in dorsal spinal cord interneuron posterior axon guidance may contribute to neurodevelopmental disorders characterized by abnormal circuit connectivity.
Altered sensorimotor circuit formation
Correct guidance of ascending and descending spinal tracts is essential for sensorimotor function, and EphrinB3/EphA4 signaling is a key mediator of this guidance. Miswiring of dorsal spinal cord interneuron axons could disrupt sensory relay and motor coordination. Studying posterior axon guidance in these interneurons provides insight into how sensorimotor circuits are assembled and how their disruption may contribute to neurological dysfunction.
From dorsal spinal cord interneuron posterior axon guidance-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate guidance gene required for posterior axon guidance? | CRISPR knockout in dorsal spinal cord interneurons |
| Does a specific point mutation alter guidance cue receptor function? | CRISPR point-mutation knock-in in spinal cord neurons |
| Can a guidance cue be visualized in vivo? | Tagged knock-in of the endogenous locus |
| Does overexpression of a guidance molecule redirect axons? | Overexpression model in dorsal spinal cord interneurons |
| Which genes are differentially expressed during guidance? | RNA-seq or bioinformatics analysis of guidance-stage spinal cords |
| Does loss of midline signaling alter commissural axon guidance? | Conditional knockout of midline-derived cues |
How to Study the dorsal spinal cord interneuron posterior axon guidance Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live imaging | Growth cone dynamics and directionality | Observing posterior axon guidance in real time |
| CRISPR knockout | Loss-of-function effects on guidance | Testing requirement of candidate genes |
| CRISPR point mutation | Effect of specific amino acid changes | Testing receptor or cue function |
| Tagged knock-in | Endogenous protein localization | Visualizing guidance molecules in vivo |
| RNA-seq | Transcriptional profiles during guidance | Identifying candidate guidance genes |
| Bioinformatics | Pathway and network analysis | Prioritizing guidance-related genes |
| Immunohistochemistry | Protein localization in spinal cord | Validating expression of guidance molecules |
| Co-immunoprecipitation | Protein-protein interactions | Testing guidance cue-receptor binding |
Live imaging of growth cone dynamics
Live imaging of dorsal spinal cord interneuron growth cones allows researchers to observe posterior axon guidance in real time and test how attractive and repulsive cues influence directionality. This approach is particularly useful for studying EphrinB3/EphA4-mediated guidance of spinal tracts and MDGA2-dependent commissural axon growth.
Genetic perturbation and knockout studies
Knockout and knockdown experiments in mouse models have been used to demonstrate that ventral midline cells are required for local control of commissural axon guidance and that roof plate-dependent patterning is necessary for dorsal CNS development. These studies provide causal evidence for the role of specific signaling centers in posterior axon guidance.
Transcriptomic and bioinformatic analysis
RNA-seq and bioinformatic analyses can identify genes differentially expressed in dorsal spinal cord interneurons during posterior axon guidance. Such analyses help prioritize candidate guidance molecules and receptors for functional testing.
Protein localization and interaction studies
Immunohistochemistry and biochemical assays can determine the localization and interactions of guidance molecules such as EphrinB3, EphA4, and MDGA2 in the developing spinal cord. These methods complement genetic studies by revealing where and when guidance proteins act.
How CRISPR Can Be Used to Study GO:0097379 dorsal spinal cord interneuron posterior axon guidance
Knockout
CRISPR knockout of candidate genes such as EphrinB3, EphA4, or MDGA2 can test whether they are required for dorsal spinal cord interneuron posterior axon guidance. Knockout of midline or roof plate signaling components can reveal their roles in local control of commissural axon guidance and dorsal CNS patterning.
Point Mutation
CRISPR point mutation can be used to introduce specific amino acid substitutions in guidance receptors or cues to dissect their functional domains. This approach is valuable for testing whether particular residues in EphA4 or MDGA2 are required for posterior axon guidance.
Knock-in
Knock-in of tags or reporters into endogenous guidance gene loci allows visualization of protein localization and dynamics during posterior axon guidance. Tagged knock-in models can also be used to isolate protein complexes from developing spinal cord tissue.
Overexpression
Overexpression of guidance molecules or their receptors in dorsal spinal cord interneurons can test whether increased levels redirect axons or alter guidance decisions. Overexpression models complement loss-of-function studies by revealing sufficiency of specific cues.
How EDITGENE Supports dorsal spinal cord interneuron posterior axon guidance Research
Researchers studying dorsal spinal cord interneuron posterior axon guidance-related genes often need to determine whether a candidate gene is causally involved in directing axon growth cones toward posterior targets. Establishing causality requires precise genetic perturbation, and CRISPR-based models provide the tools to test loss-of-function, gain-of-function, and specific mutation effects in relevant cell types.
Contact EDITGENE today to design your custom CRISPR model for dorsal spinal cord interneuron posterior axon guidance research.
Frequently Asked Questions About dorsal spinal cord interneuron posterior axon guidance
What is GO:0097379?
GO:0097379 is the Gene Ontology term for dorsal spinal cord interneuron posterior axon guidance, the process in which a dorsal spinal cord interneuron axon growth cone is directed to a posterior target along the anterior-posterior axis by attractive and repulsive cues.
What genes are involved in dorsal spinal cord interneuron posterior axon guidance?
Genes implicated in related spinal axon guidance processes include EphrinB3, EphA4, and MDGA2, as well as roof plate and ventral midline signaling components.
What does posterior axon guidance mean?
Posterior axon guidance means the axon growth cone is steered toward the tail end of the body along the anterior-posterior axis, as opposed to anterior or lateral directions.
Which cell type undergoes dorsal spinal cord interneuron posterior axon guidance?
Dorsal spinal cord interneurons are the cell type whose axons undergo this posterior guidance process.
What is the synonym for GO:0097379?
The synonym is dorsal interneuron caudal axon projection.
How is dorsal spinal cord interneuron posterior axon guidance studied?
It is studied using live imaging, genetic perturbation such as knockout and knockdown, transcriptomics, and protein localization studies in vertebrate models.
What role does EphrinB3/EphA4 signaling play in spinal axon guidance?
EphrinB3/EphA4-mediated signaling guides ascending and descending spinal tracts, providing directional information for spinal axons.
What is the role of MDGA2 in axon guidance?
MDGA2 is a cell adhesion molecule required for rostral growth of commissural axons, indicating a role in directional axon growth.
Why is roof plate signaling important for dorsal spinal cord development?
Roof plate-dependent patterning of the vertebrate dorsal central nervous system establishes the environment necessary for proper dorsal axon guidance.
How can CRISPR help study posterior axon guidance?
CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of candidate genes in dorsal spinal cord interneuron posterior axon guidance.
Conclusion
GO:0097379, dorsal spinal cord interneuron posterior axon guidance, is a specialized biological process that directs axon growth cones toward posterior targets through the integration of attractive and repulsive cues. Key molecular players include EphrinB3/EphA4 signaling and the adhesion molecule MDGA2, while roof plate and ventral midline signaling centers establish the guidance environment. Understanding this process has implications for spinal cord injury, neurodevelopmental disorders, and sensorimotor circuit formation. CRISPR-based models provide powerful tools to dissect the genetic basis of posterior axon guidance and to identify therapeutic targets.
References
- 1. Paixão S et al.. 2013. EphrinB3/EphA4-mediated guidance of ascending and descending spinal tracts.. Neuron 80(6):1407-20 PMID: 24360544
- 2. Matise MP et al.. 1999. Ventral midline cells are required for the local control of commissural axon guidance in the mouse spinal cord.. Development 126(16):3649-59 PMID: 10409510
- 3. Chizhikov VV et al.. 2005. Roof plate-dependent patterning of the vertebrate dorsal central nervous system.. Dev Biol 277(2):287-95 PMID: 15617675
- 4. Joset P et al.. 2011. Rostral growth of commissural axons requires the cell adhesion molecule MDGA2.. Neural Dev 6:22 PMID: 21542908
