Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Contactin Associated Protein 2 (CNTNAP2 Protein)</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">Contactin-2</td>
<td>Heterophilic</td>
</tr>
<tr>
<td class="label">DARP32</td>
<td>PDZ-mediated</td>
</tr>
<tr>
<td class="label">CASK</td>
<td>PDZ-mediated</td>
</tr>
<tr>
<td class="label">K+ channels</td>
<td>Complex</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">6 edges</a></td>
</tr>
</table>
Contactin Associated Protein 2 (Cntnap2 Protein) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
--- [@bellen1998]
title: CNTNAP2 Protein [@saintmartin2019]
description: Contactin Associated Protein 2 - Cell adhesion, synapse formation, neuronal migration, circuit assembly [@zuber2005]
tags: protein, neurodegeneration, Neurexin family [@patzke2020]
...Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Contactin Associated Protein 2 (CNTNAP2 Protein)</th>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">Contactin-2</td>
<td>Heterophilic</td>
</tr>
<tr>
<td class="label">DARP32</td>
<td>PDZ-mediated</td>
</tr>
<tr>
<td class="label">CASK</td>
<td>PDZ-mediated</td>
</tr>
<tr>
<td class="label">K+ channels</td>
<td>Complex</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">6 edges</a></td>
</tr>
</table>
Contactin Associated Protein 2 (Cntnap2 Protein) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
--- [@bellen1998]
title: CNTNAP2 Protein [@saintmartin2019]
description: Contactin Associated Protein 2 - Cell adhesion, synapse formation, neuronal migration, circuit assembly [@zuber2005]
tags: protein, neurodegeneration, Neurexin family [@patzke2020]
.infobox.inbox-protein [^7]
CNTNAP2 Protein [^8]
=== ===
Protein Name: Contactin Associated Protein 2
Gene: [CNTNAP2](/proteins/cntnap2-protein)
UniProt ID: O14520
Molecular Weight: 200 kDa
Protein Family: Neurexin family
Subcellular Localization: Synaptic membranes
=== ===
Overview
Contactin Associated Protein 2 is a protein encoded by the [CNTNAP2](/proteins/cntnap2-protein) gene. It belongs to the Neurexin family and is primarily localized to Synaptic membranes.
Structure
CNTNAP2 is a 200 kDa protein with multiple domains that enable its functions in neuronal development and synaptic communication.
Normal Function
Cell adhesion, synapse formation, neuronal migration, circuit assembly. This protein plays critical roles in brain development and function.
Role in Neurodegeneration
Alterations in CNTNAP2 have been associated with several neurological and neurodevelopmental disorders. The protein's role in synaptic function makes it relevant to understanding neurodegenerative processes.
Therapeutic Targeting
Research is ongoing to develop therapeutic approaches targeting CNTNAP2.
Key Publications
[1] https://pubmed.ncbi.nlm.nih.gov/9182613/
[2] https://pubmed.ncbi.nlm.nih.gov/10574462/
[3] https://pubmed.ncbi.nlm.nih.gov/11891228/
[4] https://pubmed.ncbi.nlm.nih.gov/15231748/
[5] https://pubmed.ncbi.nlm.nih.gov/16033772/
Molecular Mechanisms
CNTNAP2 (Contactin-Associated Protein 2), also known as CASPR2, is a large neuronal adhesion protein of the neurexin family. It plays essential roles in neuronal development and synaptic function through multiple mechanisms:
Domain Structure
- Neurexin-like repeats: Six laminin G-like domains for protein interactions
- Discoidin domain: Involved in lipid binding and membrane association
- EGF-like domains: For extracellular protein interactions
- Fibrillin domain: Structural support
- PDZ-binding motif: C-terminal interaction with PDZ domain proteins
Key Interactions
Expression Pattern
CNTNAP2 shows region-specific expression:
- [Cortex](/brain-regions/cortex): High in layer 2/3 pyramidal [neurons](/entities/neurons)
- [Hippocampus](/brain-regions/hippocampus): CA1 pyramidal cells
- Cerebellum: Purkinje cells
- Striatum: Medium spiny neurons
- Olfactory bulb: Mitral/tufted cells
This expression pattern correlates with its roles in language, social cognition, and motor function.
Disease Associations
Autism Spectrum Disorders (ASD)
- CNTNAP2 mutations cause Pitt-Hopkins-like syndrome
- Associated with language regression and seizures
- Risk factor for idiopathic autism
- Involved in social behavior regulation
Epilepsy
- CNTNAP2 mutations cause familial epilepsy
- Associated with cortical dysplasia-focal epilepsy syndrome
- Role in epileptogenesis
Parkinson's Disease
- Altered CNTNAP2 expression in PD brains
- May affect dopaminergic circuit function
- Possible role in L-DOPA dyskinesias
Alzheimer's Disease
- Changes in CNTNAP2 in AD hippocampus
- May affect synaptic plasticity
- Potential biomarker applications
Animal Models
- Cntnap2 knockout mice: Show reduced social interaction, vocalization deficits
- Zebrafish models: Reveal neuronal migration defects
- iPSC models: Human neurons with mutations show synaptic deficits
Therapeutic Approaches
Current therapeutic strategies include:
- Targeting protein-protein interactions
- Gene therapy for loss-of-function mutations
- Small molecule modulators of neurexin function
- Symptomatic treatment for epilepsy
Research Directions
Future research focuses on:
- Understanding CNTNAP2 isoform functions
- Developing blood-based biomarkers
- Epigenetic regulation of CNTNAP2
- Circuit-specific mechanisms
Background
The study of Contactin Associated Protein 2 (Cntnap2 Protein) 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
- [Proteins Index](/proteins)
External Links
- [UniProt](https://www.uniprot.org/uniprot/O14520)
- [NCBI Protein](https://www.ncbi.nlm.nih.gov/protein/)
References
[Poliak S, Gollan L, Martinez R, Custer A, Einheber S, Salzer JL, Trimmer JS, Shrager P, Peles E, (1999) (1999)](https://pubmed.ncbi.nlm.nih.gov/10431657/)
[Bellen HJ, Lu Y, Beckstead R, Bhat MA, (1998) (1998)](https://pubmed.ncbi.nlm.nih.gov/9719903/)
[Saint-Martin M, Ewing E, Triller A, Boudin H, (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/29900698/)
[Zuber B, Nikonenko I, Klauser P, Muller D, Dubochet J, (2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/16357228/)
[Patzke H, Erlenhardt C, Nwosu G, Yee Y, Hogan B, Lein ES, Haley JD, (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32327561/)