Ribosomal Protein S24 (RPS24)

RPS24 Gene

Introduction

The RPS24 gene encodes Ribosomal Protein S24, a component of the 40S ribosomal subunit. Ribosomal proteins are essential for protein synthesis and have increasingly been recognized for their extraribosomal functions in cellular regulation, including roles in neurodegeneration [1][2].

RPS24 is highly conserved across species and is expressed in all tissues, with particularly high expression in tissues with active protein synthesis such as bone marrow, muscle, and brain [3]. Mutations in RPS24 cause Diamond-Blackfan anemia (DBA) type 5, a pure red cell aplasia with diverse clinical manifestations.

<div class="infobox infobox-gene">
<h3>RPS24</h3>
<table>
<tr><th>Gene Symbol</th><td>RPS24</td></tr>
<tr><th>Full Name</th><td>Ribosomal Protein S24</td></tr>
<tr><th>Chromosomal Location</th><td>10q22.1</td></tr>
<tr><th>NCBI Gene ID</th><td>[6222](https://www.ncbi.nlm.nih.gov/gene/6222)</td></tr>
<tr><th>OMIM</th><td>[602412](https://omim.org/entry/602412)</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000128526</td></tr>
<tr><th>UniProt ID</th><td>[P62847](https://www.uniprot.org/uniprot/P62847)</td></tr>
<tr><th>Protein Size</th><td>156 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>Diamond-Blackfan anemia type 5</td></tr>
</table>
</div>

Protein Structure and Function

Protein Structure

RPS24 is a small ribosomal protein:

RPS24 Gene

Introduction

The RPS24 gene encodes Ribosomal Protein S24, a component of the 40S ribosomal subunit. Ribosomal proteins are essential for protein synthesis and have increasingly been recognized for their extraribosomal functions in cellular regulation, including roles in neurodegeneration [1][2].

RPS24 is highly conserved across species and is expressed in all tissues, with particularly high expression in tissues with active protein synthesis such as bone marrow, muscle, and brain [3]. Mutations in RPS24 cause Diamond-Blackfan anemia (DBA) type 5, a pure red cell aplasia with diverse clinical manifestations.

<div class="infobox infobox-gene">
<h3>RPS24</h3>
<table>
<tr><th>Gene Symbol</th><td>RPS24</td></tr>
<tr><th>Full Name</th><td>Ribosomal Protein S24</td></tr>
<tr><th>Chromosomal Location</th><td>10q22.1</td></tr>
<tr><th>NCBI Gene ID</th><td>[6222](https://www.ncbi.nlm.nih.gov/gene/6222)</td></tr>
<tr><th>OMIM</th><td>[602412](https://omim.org/entry/602412)</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000128526</td></tr>
<tr><th>UniProt ID</th><td>[P62847](https://www.uniprot.org/uniprot/P62847)</td></tr>
<tr><th>Protein Size</th><td>156 amino acids</td></tr>
<tr><th>Associated Diseases</th><td>Diamond-Blackfan anemia type 5</td></tr>
</table>
</div>

Protein Structure and Function

Protein Structure

RPS24 is a small ribosomal protein:

• Size: 156 amino acids (~17 kDa)
• Location: 40S ribosomal subunit (small subunit)
• Domain structure: Binds to 18S rRNA
• Conservation: Highly conserved across eukaryotes

Ribosomal Functions

RPS24 is essential for:

Extraribosomal Functions

Beyond translation, ribosomal proteins have diverse functions [4]:

| Function | Mechanism | Relevance |
|----------|-----------|-----------|
| DNA repair | Direct involvement in DNA damage response | Genome stability |
| Cell cycle | Regulation of p53 and other checkpoints | Cell proliferation |
| Apoptosis | Regulation of apoptotic pathways | Cell survival |
| Development | Tissue-specific expression patterns | Cell differentiation |

Expression Pattern

Tissue Distribution

RPS24 is ubiquitously expressed:

• Highest expression: Bone marrow, muscle, brain, heart
• Cellular localization: Cytoplasmic (ribosomal)
• Nucleus: Some extraribosomal functions

Brain Expression

In the central nervous system:

• Neurons: High expression in cortical and hippocampal neurons
• Glia: Present in astrocytes and oligodendrocytes
• Synaptic compartments: Local translation in dendrites

Disease Associations

Diamond-Blackfan Anemia Type 5

DBA is a congenital bone marrow failure syndrome [5]:

Clinical Features

• Anemia: Macrocytic, normoblastic
• Reticulocytopenia: Low reticulocyte count
• Growth retardation: Short stature in some patients
• Physical anomalies: Craniofacial, thumb abnormalities
• Cancer risk: Increased risk of myelodysplasia and leukemia

Genetics

• Inheritance: Autosomal dominant
• Mutation types: Missense, nonsense, splice site
• Penetrance: Variable (70-80%)

Ribosomal Dysfunction in Neurodegeneration

Ribosomal proteins are implicated in neurodegenerative diseases [6]:

Alzheimer's Disease

• Translation deficits: Reduced protein synthesis in AD brain
• Ribosomal aggregation: Ribosomes colocalize with tau tangles
• Synaptic translation: Impaired local protein synthesis

Parkinson's Disease

• mRNA translation: Altered translation efficiency
• Ribosome quality: Affected by alpha-synuclein aggregation
• Stress response: Ribosomal stress in dopaminergic neurons

ALS

• Translation dysregulation: Common feature
• Ribosome stalling: Affected by TDP-43 pathology
• C9orf72: Associated with translation defects

Molecular Mechanisms

Ribosome Biogenesis

Ribosome assembly involves:

Ribosomal Stress Responses

Cells respond to ribosomal dysfunction:

| Stress Type | Response | Outcome |
|-------------|-----------|---------|
| Ribosome biogenesis stress | p53 activation | Cell cycle arrest |
| Translational stress | eIF2α phosphorylation | Translation halt |
| Oxidative stress | ATF4 translation | Pro-survival genes |
| Proteostatic stress | UPR activation | Protein quality control |

Therapeutic Implications

Diamond-Blackfan Anemia Treatment

• Corticosteroids: First-line therapy (prednisone)
• Transfusion therapy: Supportive care
• Stem cell transplantation: Curative option
• L-leucine: Translational activator under investigation

Neurodegeneration

Ribosome-targeted approaches:

See Also

• [Ribosomal Proteins](/proteins/ribosomal-proteins)
• [Translation Machinery](/entities/translation)
• [Diamond-Blackfan Anemia](/diseases/diamond-blackfan-anemia)
• [Alzheimer's Disease](/diseases/alzheimer-disease)
• [Parkinson's Disease](/diseases/parkinson-disease)
• [Neurodegeneration](/diseases/neurodegeneration)

External Links

• [NCBI Gene: RPS24](https://www.ncbi.nlm.nih.gov/gene/6222)
• [UniProt: RPS24](https://www.uniprot.org/uniprot/P62847)
• [OMIM: RPS24](https://omim.org/entry/602412)
• [Ensembl: RPS24](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000128526)
• [GeneCards: RPS24](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RPS24)

References

Additional Research and Therapeutic Directions

Ribosome Quality Control

Cells have evolved quality control mechanisms:

Neurodegenerative Disease Mechanisms

Ribosomal dysfunction contributes to neurodegeneration through:

| Mechanism | Description | Therapeutic Target |
|-----------|-------------|-------------------|
| Translation impairment | Reduced protein synthesis | Translation enhancers |
| Ribosome aggregation | Aggregation with protein inclusions | Protein homeostasis modulators |
| Ribosomal stress | p53-mediated apoptosis | Ribosome protectors |
| Local translation failure | Synaptic protein synthesis loss | Synaptic modulators |

Animal Models

• RPS24 knockout: Embryonic lethal in mice
• Heterozygous mice: Show anemia phenotype
• Zebrafish models: Morpholino knockdown studies

Summary

RPS24 encodes ribosomal protein S24, a component of the 40S subunit essential for protein synthesis. Mutations cause Diamond-Blackfan anemia type 5, while ribosomal dysfunction more broadly contributes to Alzheimer's disease, Parkinson's disease, and ALS. Beyond their ribosomal functions, these proteins have important extraribosomal roles in DNA repair, cell cycle regulation, and apoptosis. Understanding ribosomal biology in neurodegeneration offers therapeutic opportunities through modulation of translation, ribosome quality control, and protein homeostasis.