NTN1 Gene - Netrin 1

NTN1 Gene

Introduction

Ntn1 Gene Netrin 1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox .infobox-gene"> [@mehlen2021]
| | | [@cirillo2020]
|---|---| [@yebra2019]
| Gene Symbol | NTN1 | [@bradshaw2018]
| Full Name | Netrin 1 |
| Chromosomal Location | 9p13.3 |
| NCBI Gene ID | [9479](https://www.ncbi.nlm.nih.gov/gene/9479) |
| Ensembl ID | [ENSG00000165899](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000165899) |
| UniProt ID | [O00631](https://www.uniprot.org/uniprot/O00631) |
| Associated Diseases | [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis), [Parkinson's Disease](/diseases/parkinsons-disease), [Alzheimer's Disease](/diseases/alzheimers-disease), [Spinal Cord Injury](/diseases/spinal-cord-injury) |
</div>

Overview

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NTN1 Gene

Introduction

Ntn1 Gene Netrin 1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox .infobox-gene"> [@mehlen2021]
| | | [@cirillo2020]
|---|---| [@yebra2019]
| Gene Symbol | NTN1 | [@bradshaw2018]
| Full Name | Netrin 1 |
| Chromosomal Location | 9p13.3 |
| NCBI Gene ID | [9479](https://www.ncbi.nlm.nih.gov/gene/9479) |
| Ensembl ID | [ENSG00000165899](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000165899) |
| UniProt ID | [O00631](https://www.uniprot.org/uniprot/O00631) |
| Associated Diseases | [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis), [Parkinson's Disease](/diseases/parkinsons-disease), [Alzheimer's Disease](/diseases/alzheimers-disease), [Spinal Cord Injury](/diseases/spinal-cord-injury) |
</div>

Overview

Netrin-1 (NTN1) is a member of the netrin family of axon guidance molecules. It plays a critical role in embryonic development of the nervous system by directing axon migration and neuronal cell positioning. In the adult brain, NTN1 continues to regulate synaptic plasticity, neuronal survival, and repair mechanisms.

Molecular Function

Netrin-1 is a diffusible laminin-related protein that functions as a chemotropic guidance cue. It exerts its effects through binding to transmembrane receptors including:

• DCC (Deleted in Colorectal Cancer) - dependence receptor mediating attractive responses
• UNC5H1-4 (UNC5A-D) - dependence receptors mediating repulsive responses
• Neogenin - alternative receptor for netrin-1

Signaling Mechanisms

Upon receptor binding, NTN1 activates multiple downstream signaling pathways:

DCC signaling: Triggers Src family kinases, MAPK/ERK pathway, and PI3K/Akt signaling

UNC5H signaling: Can induce [apoptosis](/entities/apoptosis) in the absence of netrin-1 through caspase activation

Rho GTPase modulation: Regulates cytoskeletal dynamics via Rac1, Cdc42, and RhoA

Expression Pattern

Netrin-1 is expressed throughout the developing and adult central nervous system:

• High expression: Cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia, spinal cord
• Moderate expression: Cerebellum, brainstem
• Peripheral expression: Lung, kidney, pancreas

In the adult brain, NTN1 is produced by [neurons](/entities/neurons) and [astrocytes](/entities/astrocytes), with particular emphasis in regions associated with plasticity and repair.

Role in Neurodegeneration

Alzheimer's Disease

• NTN1 expression is altered in AD brains, particularly in regions with amyloid pathology
• May influence neuronal responses to [Aβ](/proteins/amyloid-beta) toxicity
• Potential therapeutic target for promoting neuronal survival

Parkinson's Disease

• NTN1 promotes dopaminergic neuron survival in experimental models
• May enhance axonal regeneration in PD models
• Investigated for neuroprotective effects

Amyotrophic Lateral Sclerosis

• Netrin-1 signaling is impaired in ALS models
• Motor neurons show reduced responsiveness to netrin-1 guidance cues
• Potential for promoting motor neuron survival

Spinal Cord Injury

• NTN1 is a key target for promoting axonal regeneration after injury
• Recombinant netrin-1 promotes corticospinal tract regeneration in animal models
• Combined approaches with other guidance molecules being explored

Therapeutic Implications

Netrin-1-based therapies are being explored for:

Neurodegenerative diseases: Promoting neuronal survival and axonal integrity

Spinal cord injury: Enhancing axonal regeneration

Stroke: Supporting neuronal repair mechanisms

Delivery methods under investigation include:

• Recombinant protein administration
• Gene therapy vectors (AAV)
• Small molecule mimics

Key Publications

Lai Wing Sun K, et al. (2019). "Netrin-1 and its receptor DCC as prognostic markers and potential therapeutic targets in neurodegenerative diseases." Brain Research. PMID: 30690123(https://pubmed.ncbi.nlm.nih.gov/30690123/)

Hashimoto M, et al. (2018). "Netrin-1 promotes mitochondrial function in dopaminergic neurons." Journal of Neurochemistry. PMID: 29578567(https://pubmed.ncbi.nlm.nih.gov/29578567/)

Wu TW, et al. (2017). "Netrin-1 rescues spinal cord injury by promoting [autophagy](/entities/autophagy)." Neuroscience Letters. PMID: 28435012(https://pubmed.ncbi.nlm.nih.gov/28435012/)

Background

The study of Ntn1 Gene Netrin 1 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

See Also

• [Axon Guidance Pathways](/mechanisms/axon-guidance-neurodegeneration)
• [DCC Gene](/genes/DCC)
• [UNC5C Gene](/genes/unc5c)
• [Axonal Regeneration Therapies](/genes/th)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease-disease)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)

External Links

• [NCBI Gene: NTN1](https://www.ncbi.nlm.nih.gov/gene/9479)
• [UniProt: NTN1](https://www.uniprot.org/uniprot/O00631)
• [Human Protein Atlas: NTN1](https://www.proteinatlas.org/ENSG00000165899-NTN1)
• [OMIM: NTN1](https://www.omim.org/entry/601614)

References

[Lai K, et al, Netrin-1 in CNS development and repair (2022)](https://pubmed.ncbi.nlm.nih.gov/35411041/)

[Mehlen P, et al, Netrin-1 in Alzheimer's disease (2021)](https://pubmed.ncbi.nlm.nih.gov/34583543/)

[Cirillo G, et al, Netrin-1 promotes neural regeneration after spinal cord injury (2020)](https://pubmed.ncbi.nlm.nih.gov/32826841/)

[Yebra M, et al, Netrin-1 in Parkinson's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31376789/)

[Bradshaw TD, et al, Netrin-1 receptor interactions in neurodegeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/30026214/)

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Netrin-1 Gradient Restoration](/hypothesis/h-05b8894a) — <span style="color:#ff8a65;font-weight:600">0.31</span> · Target: NTN1

Pathway Diagram

The following diagram shows the key molecular relationships involving NTN1 Gene - Netrin 1 discovered through SciDEX knowledge graph analysis: