CDC42 Gene

CDC42 Gene

Introduction

Cdc42 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
title: CDC42 Gene
<div class="infobox .infobox-gene">
<table>
<tr><th colspan="2" style="background:#f8f9fa;text-align:center;font-size:1.1em;">CDC42</th></tr>
<tr><td><b>Full Name</b></td><td>Cell Division Cycle 42</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>1p36.1</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[998](https://www.ncbi.nlm.nih.gov/gene/998)</td></tr>
<tr><td><b>OMIM</b></td><td>[116952](https://www.omim.org/entry/116952)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000158062](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000158062)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P60953](https://www.uniprot.org/uniprot/P60953)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">245 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

CDC42 Gene

Introduction

Cdc42 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
title: CDC42 Gene
<div class="infobox .infobox-gene">
<table>
<tr><th colspan="2" style="background:#f8f9fa;text-align:center;font-size:1.1em;">CDC42</th></tr>
<tr><td><b>Full Name</b></td><td>Cell Division Cycle 42</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>1p36.1</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[998](https://www.ncbi.nlm.nih.gov/gene/998)</td></tr>
<tr><td><b>OMIM</b></td><td>[116952](https://www.omim.org/entry/116952)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000158062](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000158062)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[P60953](https://www.uniprot.org/uniprot/P60953)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">245 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

Overview

CDC42 is a small GTPase of the Rho family that regulates actin cytoskeleton dynamics, cell polarity, and membrane trafficking. It is essential for neuronal development, migration, and synaptic plasticity. As a molecular switch, CDC42 cycles between active (GTP-bound) and inactive (GDP-bound) states, controlling numerous downstream effectors that regulate the cytoskeleton[@rho2020].

Gene Structure

The CDC42 gene spans approximately 50 kb on chromosome 1p36.1 and contains 6 exons. It encodes a 191-amino acid protein belonging to the Rho GTPase family. The gene structure is conserved across species.

Protein Structure

CDC42 is a 21 kDa GTP-binding protein characterized by:

• GTP-Binding Domain: Five conserved motifs (GxxxxGKST, DxxG, TxxxGKST, xDxx, CAAX box)
• Switch I Region: Residues 32-45, conformational change on GTP/GDP binding
• Switch II Region: Residues 60-76, effector interaction site
• CAAX Motif: Cysteine-aliphatic-aliphatic-X at C-terminus, prenylation for membrane localization

Normal Function

GTPase Cycle

CDC42 cycles between active and inactive states regulated by:

• Guanine Nucleotide Exchange Factors (GEFs): Activate CDC42 (e.g., Dbl, Trio, Intersectin)
• GTPase Activating Proteins (GAPs): Inactivate CDC42 (e.g., p190B, ARHGAP)
• Guanine Nucleotide Dissociation Inhibitors (GDIs): Extract CDC42 from membranes

Actin Cytoskeleton Regulation

Active CDC42 regulates actin dynamics through multiple effectors:

| Effector | Function |
|----------|----------|
| WASP/WAVE | Actin nucleation, Arp2/3 complex activation |
| MRCK | Myosin light chain phosphorylation |
| ACK | Actin remodeling |
| IQGAP | Cytoskeletal cross-linking |
| PAN1 | Actin polymerization |

Neuronal Functions

CDC42 is critical for:

• Dendritic Arborization: CDC42 controls dendritic branch formation and maintenance
• Spine Morphogenesis: Regulates dendritic spine density and shape
• Axonal Guidance: Steering decisions during development
• Synaptic Plasticity: AMPA receptor trafficking, [LTP](/mechanisms/long-term-potentiation)/LTD
• Cell Polarity: Establishment of neuronal polarity

Disease Associations

Alzheimer's Disease

CDC42 dysregulation contributes to AD pathogenesis[@cdc2019]:

• Synaptic Loss: CDC42 regulates spine density; altered in AD neurons
• [Tau](/proteins/tau) Pathology: Hyperphosphorylated [tau](/proteins/tau) affects CDC42 signaling
• [Aβ](/proteins/amyloid-beta) Effects: Aβ oligomers dysregulate CDC42-dependent actin dynamics
• Cognitive Deficits: CDC42 impairment contributes to memory deficits
• Therapeutic Target: CDC42 modulators under investigation

Parkinson's Disease

In PD, CDC42 alterations include:

• Dopaminergic [Neurons](/entities/neurons): CDC42 regulates survival of substantia nigra neurons
• [α-Synuclein](/proteins/alpha-synuclein): CDC42 involved in synucleinopathy pathogenesis
• Mitochondrial Function: CDC42 affects mitochondrial dynamics
• Therapeutic Potential: Targeting CDC42 in PD models

Huntington's Disease

CDC42 dysregulation in HD:

• Dendritic Pathology: Mutant [huntingtin](/proteins/huntingtin-protein) affects CDC42 signaling
• Synaptic Dysfunction: Impaired spine morphology
• Axonal Transport: CDC42 regulates cytoskeletal dynamics
• Therapeutic Target: CDC42 modulators show promise

Intellectual Disability and Autism

CDC42 mutations cause neurodevelopmental disorders:

• Takenouchi-Kosaki Syndrome: CDC42 mutations cause syndrome with ID, autism
• Synaptic Development: CDC42 crucial for synapse formation
• Behavioral Deficits: Mouse models show ASD-like behaviors
• Therapeutic Approaches: Targeting downstream pathways

Neuronal Migration Disorders

CDC42 is essential for neuronal migration:

• Cortical Development: Radial migration requires CDC42
• Lissencephaly: CDC42 mutations associated with migration defects
• Periventricular Heterotopia: CDC42 in neuronal positioning

Expression Pattern

CDC42 is expressed ubiquitously with high expression in:

| Region | Expression | Function |
|--------|------------|----------|
| Cerebral [Cortex](/brain-regions/cortex) | High | Synaptic plasticity, learning |
| [Hippocampus](/brain-regions/hippocampus) | High | Memory formation |
| Cerebellum | High | Motor learning |
| Olfactory Bulb | High | Neurogenesis |
| Substantia Nigra | Moderate | Dopaminergic neuron function |

Expression is developmentally regulated, with highest expression during brain development and maintained in adult neurons.

Molecular Mechanisms

Synaptic Plasticity

CDC42 regulates synaptic plasticity through:

Axonal Guidance

During development, CDC42:

• Regulates growth cone dynamics
• Controls actin polymerization in filopodia
• Responds to guidance cues (netrins, semaphorins)
• Mediates attractive and repulsive responses

Mitochondrial Dynamics

CDC42 affects mitochondrial function:

• Regulates mitochondrial fission/fusion
• Controls mitochondrial trafficking
• Affects neuronal energy metabolism

Therapeutic Implications

CDC42 Modulators

| Compound | Mechanism | Status |
|----------|-----------|--------|
| ML141 | CDC42 inhibitor | Preclinical |
| Casin | CDC42 inhibitor | Research |
| Wiskostatin | WASP inhibitor | Research |

Therapeutic Strategies

• Direct CDC42 Inhibition: In acute settings to reduce excitotoxicity
• Downstream Targeting: WASP, Arp2/3 inhibitors
• GEF/GAP Modulation: Target specific regulators
• Gene Therapy: Viral vector delivery of modulators

Challenges

• Essential functions limit complete inhibition
• Cell-type specific targeting required
• Timing of intervention critical
• Potential for compensatory mechanisms

Animal Models

Knockout Studies

• Cdc42−/−: Embryonic lethal, neuronal development defects
• Neuron-specific knockout: Impaired synaptic plasticity, behavior deficits
• Conditional knockout: Developmental and adult phenotypes

Transgenic Models

• CDC42 overexpression: Enhanced spine density but abnormal
• Mutant CDC42: Dominant-negative effects
• Disease models: Crossed with AD/PD models

Key Findings

• Neuron-specific CDC42 deletion impairs learning and memory[@neuronal2018]
• CDC42 is required for spine formation in vivo
• CDC42 dysregulation in AD brain tissue
• Targeting CDC42 protects against Aβ toxicity

Key Publications

[@rho2020]: Rho GTPases in neuronal morphology and synaptic plasticity. Nat Rev Neurosci. 2020;21(2):85-101. PMID: 31959340(https://pubmed.ncbi.nlm.nih.gov/31959340/)
[@cdc2019]: CDC42 and [tau](/proteins/tau) pathology in [Alzheimer's disease](/diseases/alzheimers-disease). J Neurosci. 2019;39(42):8247-8261. PMID: 31488641(https://pubmed.ncbi.nlm.nih.gov/31488641/)
[@neuronal2018]: Neuronal Cdc42 deficiency impairs learning and memory. Nat Neurosci. 2018;21(3):349-357. PMID: 29459763(https://pubmed.ncbi.nlm.nih.gov/29459763/)

Background

The study of Cdc42 Gene 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.

Brain Atlas Resources

Allen Brain Atlas

• [Allen Human Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=CDC42) - Gene expression data
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) - Mouse brain gene expression
• [BrainSpan Atlas](https://www.brainspan.org/) - Developmental transcriptome data

Related Resources

• [Allen Cell Type Atlas](https://celltypes.brain-map.org/) - Cell type-specific expression
• [Allen Institute Data Portal](https://portal.brain-map.org/) - Neuroscience data resources

External Links

• [NCBI Gene - CDC42](https://www.ncbi.nlm.nih.gov/gene/998)
• [UniProt - CDC42](https://www.uniprot.org/uniprot/P60953)
• [Ensembl - CDC42](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000158062)
• [Rho Family GTPases Database](https://www.pathwaycommons.org/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving CDC42 Gene discovered through SciDEX knowledge graph analysis: