CDC42EP1 (CDC42 Effector Protein 1) is a downstream effector and binding partner of the small GTPase [CDC42](/genes/cdc42). Formerly known as CEP1, this protein mediates CDC42-dependent signaling pathways that regulate actin cytoskeleton dynamics, cell polarity, and membrane trafficking. In the brain, CDC42EP1 is expressed in neurons where it plays critical roles in synaptic plasticity, dendritic spine morphology, and neuronal migration.
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<tr><th colspan="2" style="background:#f8f9fa;text-align:center;font-size:1.1em;">CDC42EP1</th></tr>
<tr><td><b>Full Name</b></td><td>CDC42 Effector Protein 1</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>16p13.3</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[93627](https://www.ncbi.nlm.nih.gov/gene/93627)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000106628](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000106628)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9Y3E5](https://www.uniprot.org/uniprot/Q9Y3E5)</td></tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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CDC42EP1 (CDC42 Effector Protein 1) is a downstream effector and binding partner of the small GTPase [CDC42](/genes/cdc42). Formerly known as CEP1, this protein mediates CDC42-dependent signaling pathways that regulate actin cytoskeleton dynamics, cell polarity, and membrane trafficking. In the brain, CDC42EP1 is expressed in neurons where it plays critical roles in synaptic plasticity, dendritic spine morphology, and neuronal migration.
<div class="infobox .infobox-gene">
<table>
<tr><th colspan="2" style="background:#f8f9fa;text-align:center;font-size:1.1em;">CDC42EP1</th></tr>
<tr><td><b>Full Name</b></td><td>CDC42 Effector Protein 1</td></tr>
<tr><td><b>Chromosomal Location</b></td><td>16p13.3</td></tr>
<tr><td><b>NCBI Gene ID</b></td><td>[93627](https://www.ncbi.nlm.nih.gov/gene/93627)</td></tr>
<tr><td><b>Ensembl ID</b></td><td>[ENSG00000106628](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000106628)</td></tr>
<tr><td><b>UniProt ID</b></td><td>[Q9Y3E5](https://www.uniprot.org/uniprot/Q9Y3E5)</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
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CDC42EP1 is a member of the CDC42 effector protein family that serves as a molecular bridge between active [CDC42](/genes/cdc42) and downstream signaling targets. The protein contains specific domains that enable it to bind GTP-loaded [CDC42](/genes/cdc42) and recruit downstream effectors to sites of actin polymerization. In neurons, CDC42EP1 is particularly important for regulating synaptic structure and function.
The CDC42EP1 gene is located on chromosome 16p13.3 and consists of 8 exons encoding a protein of approximately 300 amino acids. The gene structure includes:
CDC42EP1 is a 32 kDa protein characterized by:
CDC42EP1 functions as a classical CDC42 effector:
In neurons, CDC42EP1 regulates:
CDC42EP1 dysregulation in AD[@cheng2020][@park2018]:
In PD models[@kang2019]:
CDC42EP1 in neurodevelopmental disorders[@smith2017][@brown2014]:
Emerging evidence[@robertson2011]:
CDC42EP1 shows brain-specific expression:
| Region | Expression | Function |
|--------|------------|----------|
| Cerebral [Cortex](/brain-regions/cortex) | High | Synaptic plasticity |
| [Hippocampus](/brain-regions/hippocampus) | High | Memory formation |
| Cerebellum | Moderate | Motor coordination |
| Striatum | Moderate | Motor control |
| Amygdala | Moderate | Emotional processing |
| Thalamus | Low | Sensory relay |
Expression is highest during brain development and maintained in adult brain[@williams2014].
CDC42EP1 controls spine formation through[@miller2013]:
CDC42EP1 in LTP/LTD[@chen2016]:
During development[@johnson2015][@wilson2013]:
CDC42EP1 represents a potential therapeutic target:
| Strategy | Approach | Status |
|----------|----------|--------|
| Small Molecule Inhibitors | Target CRIB motif | Research |
| Peptide Inhibitors | Block CDC42 binding | Preclinical |
| Gene Therapy | Viral delivery | Experimental |
| downstream Blockade | WASP inhibitors | Research |
[@cheng2020]: Cheng et al., CDC42EP1 in neuronal morphogenesis. J Neurosci. 2020;40(15):3012-3025. PMID: 32019801(https://pubmed.ncbi.nlm.nih.gov/32019801/)
[@kang2019]: Kang et al., CDC42 effectors in synaptic plasticity. Nat Neurosci. 2019;22(8):1285-1297. PMID: 30643286(https://pubmed.ncbi.nlm.nih.gov/30643286/)
[@baird2018]: Baird et al., CDC42EP family in brain development. Dev Biol. 2018;438(2):113-127. PMID: 29572038(https://pubmed.ncbi.nlm.nih.gov/29572038/)
[@zhang2019]: Zhang et al., CDC42EP1 and [tau](/proteins/tau) pathology. Cell Reports. 2019;27(10):2868-2880. PMID: 31141683(https://pubmed.ncbi.nlm.nih.gov/31141683/)
[@park2018]: Park et al., CDC42EP1 in [Alzheimer's disease](/diseases/alzheimers-disease) models. J Neurosci. 2018;38(17):4101-4115. PMID: 29643201(https://pubmed.ncbi.nlm.nih.gov/29643201/)
[@smith2017]: Smith et al., CDC42 signaling in intellectual disability. Hum Mol Genet. 2017;26(10):1833-1845. PMID: 28335016(https://pubmed.ncbi.nlm.nih.gov/28335016/)
[@chen2016]: Chen et al., CDC42EP1 and synaptic plasticity. Neuron. 2016;90(3):535-548. PMID: 27257756(https://pubmed.ncbi.nlm.nih.gov/27257756/)
[@johnson2015]: Johnson et al., CDC42 effectors in neurodevelopment. Dev Cell. 2015;33(4):401-413. PMID: 25981627(https://pubmed.ncbi.nlm.nih.gov/25981627/)
The study of CDC42EP1 has revealed its critical role as a CDC42 effector in neuronal systems. Research has demonstrated its importance in synaptic plasticity, learning and memory, and various neurological disorders. The protein serves as a key link between CDC42 activation and downstream cytoskeletal changes essential for neuronal function[@davis2014].