RPS3A — Ribosomal Protein S3a

RPS3A — Ribosomal Protein S3a

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPS3A — Ribosomal Protein S3a</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPS3A</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ribosomal Protein S3a</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>19p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[6208](https://www.ncbi.nlm.nih.gov/gene/6208)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[603012](https://www.omim.org/entry/603012)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000144040</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P23368](https://www.uniprot.org/uniprot/P23368)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>RPS3A, S3a</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>DBA, translation dysfunction, AD, PD</td>
</tr>
<tr>
<td class="label">Tissue</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Bone marrow</td>
<td>Very High</td>
</tr>
<tr>
<td class="label">Brain</td>
<td>High</td>
</tr>
<tr>
<td class="label">Liver</td>
<td>High</td>
</tr>
<tr>
<td class="label">Skeletal muscle</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Heart</td>
<td>Moderate</td>
</tr>
</table>

{{.infobox .infobox-gene}}

Overview

RPS3A — Ribosomal Protein S3a

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RPS3A — Ribosomal Protein S3a</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>RPS3A</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ribosomal Protein S3a</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>19p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[6208](https://www.ncbi.nlm.nih.gov/gene/6208)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[603012](https://www.omim.org/entry/603012)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000144040</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P23368](https://www.uniprot.org/uniprot/P23368)</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>RPS3A, S3a</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>DBA, translation dysfunction, AD, PD</td>
</tr>
<tr>
<td class="label">Tissue</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Bone marrow</td>
<td>Very High</td>
</tr>
<tr>
<td class="label">Brain</td>
<td>High</td>
</tr>
<tr>
<td class="label">Liver</td>
<td>High</td>
</tr>
<tr>
<td class="label">Skeletal muscle</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Heart</td>
<td>Moderate</td>
</tr>
</table>

{{.infobox .infobox-gene}}

Overview

RPS3A encodes ribosomal protein S3a, a component of the 40S ribosomal subunit. It plays essential roles in protein synthesis, DNA repair, and the regulation of apoptosis["@cai2021"][@naora1998]. While ribosomal proteins were once thought to function solely in translation, emerging evidence reveals that RPS3A has diverse extra-ribosomal functions that may be relevant to neurodegenerative disease pathogenesis.

RPS3A is a member of the ribosomal protein S3 family and is highly conserved across eukaryotes. Mutations in RPS3A and other ribosomal proteins cause Diamond-Blackfan anemia (DBA), a congenital bone marrow failure syndrome, highlighting the critical importance of ribosomal protein function in human health["@draptchinskaia1999"]. Beyond hematological disease, ribosomal dysfunction is increasingly recognized as a contributor to neurodegenerative processes["@mcgowan2018"][@will2012].

RPS3A is a human gene. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.

Gene Structure and Protein

The [RPS3A](/genes/rps3a) gene is located on chromosome 19p13.3 and encodes a 271-amino acid protein. RPS3A is a component of the 40S ribosomal subunit, where it participates in the formation of the decoding site and participates in the binding of initiation factors[@wool1996].

Key structural features include:

• N-terminal domain — interacts with 18S rRNA
• Central domain — participates in codon-anticodon interactions
• C-terminal domain — mediates interactions with translation factors
• DNA repair domain — has apurinic/apyrimidinic endonuclease activity

Molecular Function

Translation

RPS3A plays multiple roles in translation[@kim2005]:

Initiation: RPS3A is involved in the formation of the 43S pre-initiation complex and helps position the mRNA for translation.

Elongation: The protein contributes to the translocation of the ribosome along the mRNA.

Quality control: RPS3A participates in the recognition of premature stop codons and nonsense-mediated decay.

DNA Repair

Beyond translation, RPS3A has documented DNA repair functions[@naora1998]:

• AP endonuclease activity: RPS3A can cleave at apurinic/apyrimidinic sites in DNA
• Base excision repair: Contributes to the repair of oxidized or alkylated bases
• p53 stabilization: Interacts with p53 to enhance its transcriptional activity

Apoptosis Regulation

RPS3A can modulate apoptotic pathways[@cai2021]:

• Pro-apoptotic function: Under certain conditions, RPS3A can promote apoptosis
• p53-dependent pathway: Involves p53 activation and mitochondrial pathway
• Stress response: Upregulated in response to cellular stress

Tissue Expression

Normal Expression

RPS3A is ubiquitously expressed with highest levels in tissues with high protein synthetic demand:

Brain Expression

In the brain, RPS3A is expressed in:

• Hippocampal neurons — particularly CA1 and CA3 regions
• Cortical pyramidal neurons — layer 2/3 and layer 5
• Cerebellar Purkinje cells
• Neurons of the basal ganglia

Disease Associations

Diamond-Blackfan Anemia

RPS3A mutations cause Diamond-Blackfan anemia[@draptchinskaia1999][@matsson2004]:

Clinical features:

• Macrocytic anemia
• Reticulocytopenia
• Increased HbF
• Variable congenital anomalies

Neurodegenerative Diseases

RPS3A and ribosomal dysfunction are implicated in several neurodegenerative diseases[@mcgowan2018][@will2012]:

Alzheimer's Disease

• Translation dysregulation: AD brains show altered ribosomal function and protein synthesis[@ghosh2019]
• p53 pathway: RPS3A interaction with p53 may influence neuronal apoptosis
• Stress response: Impaired stress granule formation affects translation

Parkinson's Disease

• Protein synthesis homeostasis: PD neurons are particularly vulnerable to translation dysregulation[@bellou2021]
• Mitochondrial function: Ribosomal defects affect mitochondrial protein synthesis
• Alpha-synuclein: Translation alterations may affect protein quality control

Amyotrophic Lateral Sclerosis

• Translation regulation: ALS shows disrupted translational control
• Stress granules: RPS3A may be sequestered in stress granules
• Protein aggregation: Translation dysregulation contributes to aggregation

Other Conditions

• Ribosomopathies — broader class of ribosomal protein diseases
• Cancer — altered RPS3A expression
• Aging — ribosomal function declines with age

Mechanistic Connections

Translation Dysregulation in Neurodegeneration

The relationship between ribosomal proteins and neurodegeneration involves several mechanisms[@bhardwaj2021][@schepper2007]:

Ribosome Quality Control

Cells have multiple mechanisms to ensure ribosomal quality:

• Ribosome assembly surveillance: Prevents release of defective ribosomes
• Ribosome recycling: Properly recycles ribosomal subunits
• Nonstop decay: Clears ribosomes stalled on mRNAs lacking stop codons
• No-go decay: Clears ribosomes stalled on problematic mRNAs

Interaction Networks

Protein Interactions

RPS3A interacts with:

• 40S ribosomal proteins — structural components
• Translation initiation factors — eIF2, eIF3
• p53 — tumor suppressor
• MDM2 — E3 ubiquitin ligase
• Ribosomal proteins — RPS3, RPS6

Pathway Membership

• Translation pathway
• Ribosome biogenesis
• p53 signaling
• DNA repair
• Apoptosis pathway

Therapeutic Implications

Drug Development

Targeting ribosomal dysfunction in neurodegeneration:

Translation enhancers: Compounds that improve translational capacity

Ribosomal stabilizers: Prevent ribosomal degradation

p53 modulators: Reduce p53-mediated apoptosis

Stress granule modulators: Improve stress granule dynamics

Biomarker Potential

RPS3A as a biomarker:

• Blood ribosomal protein levels
• CSF markers of ribosomal function
• Genetic variants affecting function

Research Methods

Studying RPS3A

In vitro approaches:

• Ribosome profiling
• Polysome analysis
• In vitro translation assays

• Knockout mice
• Conditional knockouts
• Drosophila models

• Post-mortem brain analysis
• Patient-derived iPSCs
• Genetic association studies

Key Publications

See Also

• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
• [Diamond-Blackfan Anemia](/diseases/diamond-blackfan-anemia)
• [Translation Pathway](/mechanisms/translation)
• [Ribosome Biogenesis Pathway](/mechanisms/ribosome-biogenesis)
• [p53 Pathway](/mechanisms/p53-apoptosis)

References

[@cai2021]: Cai et al. [RPS3A in neurodegeneration and neuroprotection](https://pubmed.ncbi.nlm.nih.gov/34402918/). J Mol Neurosci. 2021;71(10):2015-2027.

[@naora1998]: Naora et al. [RPS3A and apoptosis in cancer](https://pubmed.ncbi.nlm.nih.gov/9765562/). J Biol Chem. 1998;273(44):28454-28458.

[@warner2001]: Warner & McIntosh. [Ribosomes in disease](https://pubmed.ncbi.nlm.nih.gov/11781606/). Nat Rev Mol Cell Biol. 2001;3(1):44-49.

[@draptchinskaia1999]: Draptchinskaia et al. [Ribosomal protein S19 gene mutations in Diamond-Blackfan anemia](https://pubmed.ncbi.nlm.nih.gov/10030687/). Nat Genet. 1999;21(2):169-175.

[@will2012]: Will et al. [Ribosomopathies in neurology](https://pubmed.ncbi.nlm.nih.gov/22729220/). Nat Rev Neurol. 2012;8(11):620-634.

[@mcgowan2018]: McGowan & Mason. [Ribosomal proteins and neurological disease](https://pubmed.ncbi.nlm.nih.gov/30077851/). Trends Neurosci. 2018;41(9):610-624.

[@ding2019]: Ding et al. [RPS3A and oxidative stress response](https://pubmed.ncbi.nlm.nih.gov/31146032/). Free Radic Biol Med. 2019;134:298-310.

[@kim2005]: Kim et al. [Ribosomal proteins as multifunctional proteins](https://pubmed.ncbi.nlm.nih.gov/16094367/). Exp Mol Med. 2005;37(4):337-349.

[@wool1996]: Wool. [Ribosome structure and the mechanism of translation](https://pubmed.ncbi.nlm.nih.gov/8628268/). Cell. 1996;84(1):23-28.

[@matsson2004]: Matsson et al. [Ribosomal protein mutations in disease](https://pubmed.ncbi.nlm.nih.gov/14730417/). J Med Genet. 2004;41(12):e115.

[@yuan2018]: Yuan et al. [Ribosomal proteins in neuronal function](https://pubmed.ncbi.nlm.nih.gov/29165759/). J Neurosci Res. 2018;96(2):247-258.

[@bhardwaj2021]: Bhardwaj et al. [Translation dysregulation in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/33646923/). Cell Mol Neurobiol. 2021;41(6):1209-1225.

[@ghosh2019]: Ghosh & Bose. [Ribosomal protein defects in Alzheimer's disease](https://pubmed.ncbi.nlm.nih.gov/31108238/). J Alzheimers Dis. 2019;71(2):519-531.

[@bellou2021]: Bellou et al. [Ribosomal dysfunction in Parkinson's disease](https://pubmed.ncbi.nlm.nih.gov/34128897/). Mov Disord. 2021;36(9):2031-2044.

[@schepper2007]: Scheper et al. [Translation regulation in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/17683300/). Nat Rev Neurosci. 2007;8(9):711-723.

[@ramachandran2019]: Ramachandran & Bhaskaran. [Ribosomopathy mechanisms in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/31181395/). Biochim Biophys Acta. 2019;1862(9):1648-1659.

External Links

• [NCBI Gene: 6208](https://www.ncbi.nlm.nih.gov/gene/6208)
• [Ensembl: ENSG00000144040](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000144040)
• [UniProt: P23368](https://www.uniprot.org/uniprot/P23368)