GO:0048671 negative regulation of collateral sprouting: Axon Branching Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0048671 (negative regulation of collateral sprouting) describes any process that stops, prevents, or reduces the frequency, rate or extent of collateral sprouting, a biological_process in the Gene Ontology.
• Collateral sprouting is the formation of new axonal branches from intact axons; its negative regulation is essential to prevent excessive or misdirected wiring after injury.
• Key molecular brakes include caspase 3 signaling in developing neurons, transsynaptic activity-dependent cues, MAP3K stress kinases DLK/LZK, and the Ras/MAPK pathway via NF1.
• Loss of negative regulation, for example Nf1 deletion in neurons, leads to increased axon collateral branching after dorsal root injury, linking the term to neurofibromatosis and neuropathic pain.
• The term is studied using axon arborization assays, transsynaptic tracing, zebrafish peripheral nerve injury models, and genetic knockout or knock-in mice.
• Therapeutic interest spans nerve regeneration, vascular collateral growth, and diseases of aberrant sprouting such as neurofibromatosis type 1 and epilepsy.
Description
GO:0048671, negative regulation of collateral sprouting, is a Gene Ontology biological_process term defined as any process that stops, prevents, or reduces the frequency, rate or extent of collateral sprouting. Collateral sprouting is the extension of new axonal branches from uninjured or partially injured neurons, a form of structural plasticity that can restore function after damage but can also cause maladaptive circuit rewiring. Understanding the negative regulation of this process is therefore central to neurodevelopment, regeneration, and disease. Experimental work in the developing chick ciliary ganglion has shown that caspase 3 activity regulates axon arborization patterns, providing evidence that apoptotic and signaling molecules can act as brakes on branch formation. Transsynaptic activity-dependent regulation of axon branching and neurotrophin expression further demonstrates that target-derived and activity-dependent cues can suppress or refine collateral branches in vivo. In the peripheral nervous system, the MAP3Ks DLK and LZK direct diverse responses to axon damage in zebrafish, including regulation of regenerative branching. Genetic deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury, directly linking loss of a negative regulator to excessive sprouting. Finally, inhibition of tyrosine phosphatases augments collateral blood flow in a rat model of peripheral vascular disease, showing that negative regulation of collateral growth extends beyond neurons to vascular beds. These studies establish GO:0048671 as a convergence point for developmental, injury, and disease-related signaling.
negative regulation of collateral sprouting At A Glance
| GO ID | GO:0048671 |
|---|---|
| GO term | negative regulation of collateral sprouting |
| Ontology | biological_process |
| Synonym | down regulation of collateral sprouting; down-regulation of collateral sprouting; downregulation of collateral sprouting; inhibition of collateral sprouting |
| Major function | Suppression of new axonal branch formation from existing axons |
| Related process | Collateral sprouting, axon branching, axon regeneration |
| Key regulators | Caspase 3, DLK, LZK, NF1, neurotrophins, tyrosine phosphatases |
| Disease relevance | Neurofibromatosis type 1, neuropathic pain, vascular disease, aberrant circuit rewiring |
| Research models | Chick ciliary ganglion, zebrafish peripheral neurons, mouse dorsal root injury, rat hindlimb ischemia |
What Is GO:0048671?
In plain terms, GO:0048671 describes the cellular processes that put the brakes on collateral sprouting. The QuickGO definition states: Any process that stops, prevents, or reduces the frequency, rate or extent of collateral sprouting. This includes molecular signals that inhibit the initiation, extension, or stabilization of new axonal branches from existing axons. The term is a biological_process and has synonyms including down regulation of collateral sprouting, down-regulation of collateral sprouting, downregulation of collateral sprouting, and inhibition of collateral sprouting. It is the negative counterpart to positive regulation of collateral sprouting and is distinct from general axon guidance or synapse formation. Researchers use this term when annotating genes or pathways that suppress branch formation, such as caspase 3 signaling in the developing ciliary ganglion, transsynaptic activity-dependent cues, DLK/LZK stress kinase pathways, and NF1-dependent Ras/MAPK signaling.
Why Is negative regulation of collateral sprouting Important in Cell Biology?
Negative regulation of collateral sprouting is important because unchecked branch formation can disrupt neural circuits, cause pain, and contribute to tumor-associated nerve growth, while controlled sprouting is needed for functional recovery after injury. The term provides a framework for identifying molecular brakes that could be targeted to promote or inhibit regeneration in specific contexts. In the vascular system, collateral growth is similarly regulated, and its manipulation can improve blood flow in peripheral vascular disease.
• Prevents excessive or misdirected axonal branching during development and after injury.
• Controls circuit refinement and target innervation through activity-dependent cues.
• Involves stress kinase pathways (DLK/LZK) that coordinate injury responses and regenerative branching.
• Loss of negative regulators such as NF1 leads to increased collateral branching and neurofibromatosis-related pathology.
• Modulates collateral blood flow in peripheral vascular disease, a non-neuronal example of the process.
• Provides therapeutic targets for neuropathic pain, epilepsy, and nerve regeneration.
• Helps interpret single-cell and spatial transcriptomics of sprouting neurons.
• Guides CRISPR screens for genes that suppress or permit collateral sprouting.
• Informs bioinformatics annotation of axon branching gene sets.
• Supports development of precision medicine for neurofibromatosis and related disorders.
What Happens During negative regulation of collateral sprouting?
Initiation of collateral sprouting and its brakes
In simple terms: New branches start to grow from an axon, but specific signals can stop them before they extend.
Collateral sprouting begins with cytoskeletal reorganization at the axon shaft, often triggered by injury or activity changes. Negative regulation at this stage involves caspase 3 signaling, which regulates axon arborization patterns in the developing chick ciliary ganglion. Transsynaptic activity-dependent cues can also suppress branch initiation by modulating neurotrophin expression in vivo.
Elongation and stabilization checkpoints
In simple terms: Even if a branch starts, it can be halted or destabilized before it becomes permanent.
During elongation, MAP3Ks DLK and LZK direct diverse responses to axon damage in zebrafish peripheral neurons, including regulation of regenerative branching. NF1 acts as a negative regulator of Ras/MAPK signaling; deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury, showing that this checkpoint is critical for limiting sprouting.
Activity-dependent refinement
In simple terms: Neuronal activity helps decide which branches survive and which are removed.
Transsynaptic activity-dependent regulation of axon branching and neurotrophin expression in vivo demonstrates that target-derived signals and synaptic activity can refine or eliminate collateral branches. This refinement is a form of negative regulation that ensures appropriate connectivity.
Injury-induced suppression
In simple terms: After nerve damage, specific stress kinases can either promote repair or suppress excessive branching.
The MAP3Ks DLK and LZK are central to injury signaling in zebrafish peripheral neurons, where they direct diverse responses including regulation of axon branching. In mammals, Nf1 deletion after dorsal root injury increases collateral branching, indicating that intact NF1 signaling normally suppresses this response.
Vascular collateral growth and its inhibition
In simple terms: The same principle applies to blood vessels, where collateral growth can be enhanced or inhibited.
In a rat model of peripheral vascular disease, tyrosine phosphatase inhibition augments collateral blood flow, showing that endogenous phosphatases negatively regulate collateral growth. This extends the concept of negative regulation of collateral sprouting beyond neurons to vascular remodeling.
Key Genes Involved in GO:0048671 negative regulation of collateral sprouting
The following genes and proteins have been experimentally implicated in the negative regulation of collateral sprouting or related collateral growth processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CASP3 | Caspase 3 signaling regulates axon arborization patterns | Studied in developing chick ciliary ganglion for branch suppression |
| NF1 | Negative regulator of Ras/MAPK; loss increases collateral branching | Mouse dorsal root injury model shows increased sprouting after neuronal Nf1 deletion |
| DLK (MAP3K12) | Stress kinase directing injury responses | Zebrafish peripheral neuron axon damage model |
| LZK (MAP3K13) | Stress kinase cooperating with DLK | Zebrafish peripheral neuron axon damage model |
| NTRK1 (TrkA) | Neurotrophin receptor affecting branching | Transsynaptic activity-dependent regulation of axon branching |
| NTRK2 (TrkB) | Neurotrophin receptor affecting branching | Transsynaptic activity-dependent regulation of axon branching |
| BDNF | Neurotrophin modulating branch stability | Activity-dependent regulation of neurotrophin expression in vivo |
| NGF | Neurotrophin influencing sprouting | Transsynaptic regulation of axon branching |
| PTPN (tyrosine phosphatases) | Negatively regulate collateral blood flow | Rat model of peripheral vascular disease |
| RAS | Downstream of NF1; promotes growth signaling | Implicated in NF1-dependent branching |
| MAPK1/3 (ERK) | Downstream effectors of Ras | Implicated in NF1-dependent branching |
| Caspase 3 substrates | Cytoskeletal and signaling targets | Potential mediators of arborization suppression |
| DLK/LZK substrates | Injury signaling effectors | Zebrafish axon damage responses |
| Neurotrophin receptors | Activity-dependent branch refinement | In vivo transsynaptic regulation |
| Tyrosine phosphatase targets | Vascular collateral growth | Rat hindlimb ischemia model |
How Is negative regulation of collateral sprouting Regulated?
Negative regulation of collateral sprouting is controlled by multiple signaling pathways. Caspase 3 activity regulates axon arborization patterns in the developing chick ciliary ganglion. Transsynaptic activity and neurotrophin expression provide activity-dependent control of branching in vivo. The MAP3Ks DLK and LZK direct diverse responses to axon damage in zebrafish peripheral neurons, including regulation of regenerative branching. NF1 acts as a negative regulator of Ras/MAPK signaling; deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury. In the vascular system, tyrosine phosphatase inhibition augments collateral blood flow in a rat model of peripheral vascular disease, indicating that phosphatases negatively regulate collateral growth.
negative regulation of collateral sprouting and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NF1 | Neurofibromatosis type 1, neuropathic pain | Neuron-specific Nf1 knockout mouse with dorsal root injury |
| CASP3 | Developmental circuit formation | Chick ciliary ganglion explants or caspase 3 knockout |
| DLK/LZK | Axon injury response, regeneration | Zebrafish peripheral neuron injury model |
| NTRK1/NTRK2 | Activity-dependent branching disorders | Transsynaptic tracing in vivo |
| PTPN | Peripheral vascular disease | Rat hindlimb ischemia model with phosphatase inhibitors |
Neurofibromatosis type 1 and aberrant sprouting
NF1 is a negative regulator of Ras/MAPK signaling, and deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury. This links loss of negative regulation of collateral sprouting to neurofibromatosis type 1 pathology, where excessive nerve branching and tumor formation occur.
Neuropathic pain and sensory circuit rewiring
Increased collateral branching after dorsal root injury can contribute to maladaptive sensory circuit rewiring and neuropathic pain. Negative regulation of collateral sprouting is therefore relevant to understanding and treating chronic pain states.
Peripheral vascular disease and collateral blood flow
In a rat model of peripheral vascular disease, tyrosine phosphatase inhibition augments collateral blood flow, showing that negative regulation of collateral growth limits vascular compensation. This has implications for therapeutic angiogenesis in ischemic diseases.
Developmental disorders of circuit formation
Caspase 3 signaling regulates axon arborization patterns in the developing chick ciliary ganglion, and transsynaptic activity-dependent cues refine branching in vivo. Disruption of these negative regulatory mechanisms may contribute to developmental circuit disorders, though direct human evidence is still limited.
From negative regulation of collateral sprouting-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate collateral sprouting after injury? | Conditional knockout mouse with dorsal root injury |
| What is the role of caspase 3 in arborization? | Chick ciliary ganglion culture with caspase inhibitors |
| How do DLK/LZK control injury-induced branching? | Zebrafish peripheral neuron axon damage |
| Do neurotrophins mediate activity-dependent branch refinement? | In vivo transsynaptic activity manipulation |
| Can phosphatase inhibition enhance collateral blood flow? | Rat model of peripheral vascular disease |
| Is a point mutation in NF1 sufficient to increase branching? | Knock-in mouse expressing mutant Nf1 |
How to Study the negative regulation of collateral sprouting Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Axon arborization assay | Branch number and length | Chick ciliary ganglion cultures |
| Transsynaptic tracing | Activity-dependent branch refinement | In vivo neurotrophin regulation |
| Zebrafish live imaging | Axon damage responses | DLK/LZK function in peripheral neurons |
| Conditional knockout | Gene requirement for sprouting suppression | Nf1 deletion in mouse dorsal root injury |
| Laser Doppler perfusion | Collateral blood flow | Rat hindlimb ischemia |
| Immunohistochemistry | Protein localization in branches | Caspase 3 and neurotrophin staining |
| RNA-seq | Transcriptional changes during sprouting | Injury models |
| CRISPR screening | Identify negative regulators | In vitro neuron cultures |
Axon arborization assays
Quantifying branch number and length in cultured neurons or explants, such as the chick ciliary ganglion, allows direct assessment of negative regulation of collateral sprouting.
Transsynaptic tracing and activity manipulation
In vivo transsynaptic activity-dependent regulation of axon branching can be studied using neurotrophin expression reporters and synaptic activity modulators.
Zebrafish peripheral nerve injury models
Zebrafish peripheral neurons enable live imaging of axon damage responses and genetic manipulation of DLK/LZK to study regenerative branching.
Genetic knockout and injury models
Conditional deletion of Nf1 in neurons combined with dorsal root injury provides a robust model for increased collateral branching.
Vascular collateral flow measurement
Rat models of peripheral vascular disease with tyrosine phosphatase inhibition allow measurement of collateral blood flow as a readout of negative regulation.
How CRISPR Can Be Used to Study GO:0048671 negative regulation of collateral sprouting
Knockout
CRISPR knockout of candidate genes such as Nf1 or Casp3 in neurons or animal models can test whether they are required for negative regulation of collateral sprouting.
Point Mutation
Introducing point mutations in genes like NF1 can dissect specific signaling domains required for suppressing collateral branching.
Knock-in
Knock-in of tagged or reporter alleles allows visualization of protein localization during collateral sprouting and its inhibition.
Overexpression
Overexpression of negative regulators such as NF1 or caspase 3 can test sufficiency for suppressing collateral sprouting in vitro and in vivo.
How EDITGENE Supports negative regulation of collateral sprouting Research
Researchers studying negative regulation of collateral sprouting-related genes often need to determine whether a candidate gene is causally involved in suppressing or permitting branch formation. EDITGENE provides CRISPR-based cell and animal models to accelerate this discovery.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of collateral sprouting research.
Frequently Asked Questions About negative regulation of collateral sprouting
What is GO:0048671?
GO:0048671 is the Gene Ontology term for negative regulation of collateral sprouting, defined as any process that stops, prevents, or reduces the frequency, rate or extent of collateral sprouting.
What is collateral sprouting?
Collateral sprouting is the formation of new axonal branches from existing axons, a form of structural plasticity that can be suppressed by negative regulatory mechanisms.
What genes are involved in negative regulation of collateral sprouting?
Key genes include NF1, CASP3, DLK (MAP3K12), LZK (MAP3K13), and neurotrophin receptors such as NTRK1 and NTRK2.
How is negative regulation of collateral sprouting studied?
It is studied using axon arborization assays, transsynaptic tracing, zebrafish injury models, conditional knockout mice, and vascular flow measurements.
Why is negative regulation of collateral sprouting important?
It prevents excessive or misdirected branching that can cause pain, circuit dysfunction, and disease, while allowing controlled regeneration.
What diseases are linked to defective negative regulation of collateral sprouting?
Neurofibromatosis type 1, neuropathic pain, and peripheral vascular disease have been linked to altered regulation of collateral sprouting or growth.
What is the role of NF1 in collateral sprouting?
NF1 is a negative regulator of Ras/MAPK signaling; deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury.
How do DLK and LZK regulate collateral sprouting?
DLK and LZK are MAP3Ks that direct diverse responses to axon damage in zebrafish peripheral neurons, including regulation of regenerative branching.
Can CRISPR be used to study negative regulation of collateral sprouting?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models can test the role of candidate genes in this process.
What model organisms are used for collateral sprouting research?
Chick ciliary ganglion, zebrafish peripheral neurons, mouse dorsal root injury models, and rat hindlimb ischemia models are commonly used.
Conclusion
GO:0048671, negative regulation of collateral sprouting, is a critical biological process that restrains axon branch formation to maintain proper neural wiring and prevent disease. Key regulators such as caspase 3, DLK/LZK, NF1, and neurotrophin signaling have been identified through developmental and injury models. The concept extends to vascular collateral growth, where tyrosine phosphatases limit blood flow recovery. Understanding these mechanisms offers therapeutic opportunities for neurofibromatosis, neuropathic pain, and ischemic vascular disease. EDITGENE provides comprehensive CRISPR services to accelerate research on this term.
References
- 1. Katow H et al.. 2017. Regulation of axon arborization pattern in the developing chick ciliary ganglion: Possible involvement of caspase 3.. Dev Growth Differ 59(3):115-128 PMID: 28430358
- 2. Calinescu AA et al.. 2011. Transsynaptic activity-dependent regulation of axon branching and neurotrophin expression in vivo.. J Neurosci 31(36):12708-15 PMID: 21900550
- 3. Adula KP et al.. 2022. The MAP3Ks DLK and LZK Direct Diverse Responses to Axon Damage in Zebrafish Peripheral Neurons.. J Neurosci 42(32):6195-6210 PMID: 35840323
- 4. Romero MI et al.. 2007. Deletion of Nf1 in neurons induces increased axon collateral branching after dorsal root injury.. J Neurosci 27(8):2124-34 PMID: 17314307
- 5. Carr AN et al.. 2004. Tyrosine phosphatase inhibition augments collateral blood flow in a rat model of peripheral vascular disease.. Am J Physiol Heart Circ Physiol 287(1):H268-76 PMID: 14988069
