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.
| Gene Symbol | RPS24 |
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| Full Name | Ribosomal Protein S24 |
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| Chromosomal Location | 10q22.1 |
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| NCBI Gene ID | [6222](https://www.ncbi.nlm.nih.gov/gene/6222) |
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| OMIM | [602412](https://omim.org/entry/602412) |
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| Ensembl ID | ENSG00000128526 |
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| UniProt ID | [P62847](https://www.uniprot.org/uniprot/P62847) |
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| Protein Size | 156 amino acids |
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| Associated Diseases | Diamond-Blackfan anemia type 5 |
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¶ Protein Structure and Function
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
RPS24 is essential for:
- Ribosome assembly: Critical for 40S subunit formation
- Translation initiation: Part of the small subunit interface
- tRNA binding: Participates in the decoding center
- mRNA binding: Involved in mRNA recruitment
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 |
RPS24 is ubiquitously expressed:
- Highest expression: Bone marrow, muscle, brain, heart
- Cellular localization: Cytoplasmic (ribosomal)
- Nucleus: Some extraribosomal functions
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
DBA is a congenital bone marrow failure syndrome [5]:
- 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
- Inheritance: Autosomal dominant
- Mutation types: Missense, nonsense, splice site
- Penetrance: Variable (70-80%)
Ribosomal proteins are implicated in neurodegenerative diseases [6]:
- Translation deficits: Reduced protein synthesis in AD brain
- Ribosomal aggregation: Ribosomes colocalize with tau tangles
- Synaptic translation: Impaired local protein synthesis
- mRNA translation: Altered translation efficiency
- Ribosome quality: Affected by alpha-synuclein aggregation
- Stress response: Ribosomal stress in dopaminergic neurons
- Translation dysregulation: Common feature
- Ribosome stalling: Affected by TDP-43 pathology
- C9orf72: Associated with translation defects
Ribosome assembly involves:
- rRNA transcription: By RNA Pol I (28S, 18S, 5.8S)
- Ribosomal protein synthesis: By RNA Pol II
- Assembly in nucleolus: Pre-40S and pre-60S formation
- Export to cytoplasm: Final maturation
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 |
- Corticosteroids: First-line therapy (prednisone)
- Transfusion therapy: Supportive care
- Stem cell transplantation: Curative option
- L-leucine: Translational activator under investigation
Ribosome-targeted approaches:
- mTOR modulators: Rapamycin, rapalogs
- Translation inhibitors: eIF4E inhibitors
- Ribosome stabilizers: Under development
- L-leucine supplementation: May enhance translation