RAB23 Gene

RAB23 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">rab23</th>
</tr>
<tr>
<td class="label">:---</td>
<td>:---</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>RAB23</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>RAB23, Member RAS Oncogene Family</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>6p11.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[51684](https://www.ncbi.nlm.nih.gov/gene/51684)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[607039](https://www.omim.org/entry/607039)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000102710</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9ULC5](https://www.uniprot.org/uniprot/Q9ULC5)</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Carpenter Syndrome](/diseases/carpenter-syndrome), [Parkinson's Disease](/diseases/parkinsons-disease)</td>
</tr>
</table>

Overview

RAB23 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">rab23</th>
</tr>
<tr>
<td class="label">:---</td>
<td>:---</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>RAB23</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>RAB23, Member RAS Oncogene Family</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>6p11.2</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[51684](https://www.ncbi.nlm.nih.gov/gene/51684)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[607039](https://www.omim.org/entry/607039)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000102710</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9ULC5](https://www.uniprot.org/uniprot/Q9ULC5)</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Carpenter Syndrome](/diseases/carpenter-syndrome), [Parkinson's Disease](/diseases/parkinsons-disease)</td>
</tr>
</table>

Overview

RAB23 (RAB23, Member RAS Oncogene Family) encodes a member of the Rab GTPase family, essential regulators of intracellular membrane trafficking. RAB23 functions as a molecular switch, cycling between an active GTP-bound state and an inactive GDP-bound state to control vesicle transport between cellular compartments. In the brain, RAB23 plays critical roles in endocytic trafficking, autophagy, synaptic function, and has been implicated in the pathogenesis of Alzheimer's disease and other neurodegenerative disorders.

Gene Information

Molecular Function

GTPase Activity and Regulation

RAB23 functions as a small GTPase with the following characteristics:

• GTP binding: RAB23 binds GTP with high affinity, adopting its active conformation
• GTP hydrolysis: Intrinsic GTPase activity hydrolyzes GTP to GDP, switching to the inactive state
• GDP/GTP cycling: This cycle is regulated by:
• GEFs (Guanine nucleotide Exchange Factors): Activate RAB23 by promoting GTP binding
• GAPs (GTPase Activating Proteins): Inactivate RAB23 by accelerating GTP hydrolysis
• GDIs (GDP Dissociation Inhibitors): Extract RAB23 from membranes

Cellular Localization

RAB23 is localized to:

• Endocytic vesicles: Early and late endosomes
• Golgi apparatus: Involved in Golgi-to-endosome trafficking
• Autophagosomes: Participates in autophagy
• Plasma membrane: Involved in endocytosis and exocytosis

Key Functions

Normal Function in the Brain

Neuronal Expression

RAB23 is expressed in various brain regions:

• [Cerebral cortex](/brain-regions/cortex) — particularly layer 5 pyramidal neurons
• [Hippocampus](/brain-regions/hippocampus) — CA1-CA3 pyramidal cells and dentate gyrus
• Cerebellum — Purkinje cells and granule cells
• [Substantia nigra](/brain-regions/substantia-nigra) — dopaminergic neurons

Synaptic Function

In neurons, RAB23 participates in:

• Synaptic vesicle recycling: Controls the fate of synaptic vesicle components after endocytosis
• Dendritic spine morphology: Regulates the formation and maintenance of dendritic spines
• Postsynaptic trafficking: Involved in the delivery and recycling of postsynaptic receptors

Autophagy and Protein Quality Control

RAB23 plays a key role in the autophagy-lysosome pathway:

• Autophagosome formation: Participates in the early stages of autophagosome biogenesis
• Maturation: Controls the fusion of autophagosomes with lysosomes
• Aggregate clearance: Facilitates the clearance of misfolded proteins and aggregates

Disease Associations

Alzheimer's Disease

RAB23 has emerged as an important player in AD pathogenesis:

Endocytic Dysfunction: The endocytic pathway is disrupted early in AD. RAB23, as a key regulator of endocytic trafficking, shows altered expression and function in AD brains. Studies demonstrate reduced RAB23 levels in AD temporal cortex, correlating with disease severity.

Amyloid-beta Metabolism: RAB23 is involved in the trafficking and processing of [amyloid precursor protein](/proteins/app) and [amyloid-beta](/proteins/amyloid-beta). Dysregulated RAB23 function may contribute to Aβ accumulation by altering the balance between amyloidogenic and non-amyloidogenic processing.

Autophagy Impairment: Autophagy is compromised in AD. RAB23 dysfunction contributes to impaired autophagic clearance, leading to the accumulation of autophagic vacuoles containing Aβ and tau pathology.

Tau Pathology: RAB23 may influence tau pathology through its effects on lysosomal function and protein trafficking. Dysregulated RAB23 could contribute to the spread of tau pathology.

Parkinson's Disease

RAB23 involvement in PD includes:

Alpha-synuclein Trafficking: RAB23 regulates the intracellular trafficking of [alpha-synuclein](/proteins/alpha-synuclein). Altered RAB23 function may contribute to the aggregation and spread of synuclein pathology.

Lysosomal Function: RAB23-mediated regulation of lysosomal positioning and function is relevant to PD, where lysosomal dysfunction is a key feature.

Exosome Release: RAB23 regulates exosome release, which may be involved in the cell-to-cell propagation of pathology in PD.

Carpenter Syndrome

RAB23 mutations cause Carpenter syndrome, a rare genetic disorder characterized by:

• Craniosynostosis (premature fusion of skull sutures)
• Polysyndactyly (extra fingers/toes)
• Obesity
• Intellectual disability

Mechanisms of Dysfunction

Transcriptional Dysregulation

• Reduced RAB23 expression in AD brain
• Altered promoter methylation in disease states
• miRNA-mediated post-transcriptional regulation

Protein Localization

• Mislocalization of RAB23 in neurodegeneration
• Reduced membrane association
• Altered interaction with effectors

Pathway Crosstalk

• Impaired crosstalk between endocytic and autophagic pathways
• Dysregulated interaction with other Rab proteins
• Altered connection to cytoskeletal dynamics

Therapeutic Implications

Targeting RAB23 Pathways

Challenges

• Specificity: Achieving pathway-specific effects
• BBB penetration: Therapeutic delivery to the brain
• Timing: Optimal intervention window

Research Directions

• Developing RAB23-targeted therapeutics
• Understanding genetic susceptibility variants
• Biomarker development
• Investigating RAB23 in specific cell types

Pathway & Interaction Diagram

Interactive diagram showing RAB23's key relationships in the SciDEX knowledge graph (9 connections shown).

See Also

• [Endocytic Pathway](/mechanisms/endocytic-pathway)
• [Autophagy](/mechanisms/autophagy)
• [Amyloid-beta Metabolism](/mechanisms/amyloid-metabolism)
• [Alpha-synuclein](/proteins/alpha-synuclein)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Lysosomal Function](/mechanisms/lysosomal-dysfunction)

External Links

• [NCBI Gene: RAB23](https://www.ncbi.nlm.nih.gov/gene/51684)
• [UniProt: Q9ULC5](https://www.uniprot.org/uniprot/Q9ULC5)
• [Ensembl: ENSG00000102710](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000102710)
• [OMIM: 607039](https://www.omim.org/entry/607039)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving RAB23 Gene discovered through SciDEX knowledge graph analysis: