RPL18A Gene - Ribosomal Protein L18a

RPL18A Gene - Ribosomal Protein L18a

Overview

RPL18A (Ribosomal Protein L18a) encodes a ribosomal protein component of the 60S large ribosomal subunit. While primarily characterized as a structural protein involved in protein synthesis, RPL18A has emerging connections to disease processes including ribosomopathies and viral interactions[@cervantes2015][@kim2025]. The protein is ubiquitously expressed and plays essential roles in ribosome assembly and function, with potential implications for understanding neurodegenerative processes through ribosomal dysfunction[@zhou2022][@ding2005].

Gene Information

<div class="infobox infobox-gene">
<h3>RPL18A</h3>
<table>
<tr><th>Full Name</th><td>Ribosomal Protein L18a</td></tr>
<tr><th>Gene Symbol</th><td>RPL18A</td></tr>
<tr><th>Chromosomal Location</th><td>19p13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>6141</td></tr>
<tr><th>OMIM</th><td>604210</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000105640</td></tr>
<tr><th>UniProt ID</th><td>P62748</td></tr>
<tr><th>Protein Length</th><td>176 amino acids</td></tr>
<tr><th>Protein Molecular Weight</th><td>~20 kDa</td></tr>
<tr><th>Associated Diseases</th><td>[Ribosomopathies](/diseases/ribosomopathies), [Various Cancers](/diseases/cancer), [Viral Infections](/diseases/viral-infections), [Neurodegeneration](/diseases/neurodegeneration)</td></tr>
</table>
</div>

Molecular Function

Role in 60S Ribosomal Subunit

RPL18A Gene - Ribosomal Protein L18a

Overview

RPL18A (Ribosomal Protein L18a) encodes a ribosomal protein component of the 60S large ribosomal subunit. While primarily characterized as a structural protein involved in protein synthesis, RPL18A has emerging connections to disease processes including ribosomopathies and viral interactions[@cervantes2015][@kim2025]. The protein is ubiquitously expressed and plays essential roles in ribosome assembly and function, with potential implications for understanding neurodegenerative processes through ribosomal dysfunction[@zhou2022][@ding2005].

Gene Information

<div class="infobox infobox-gene">
<h3>RPL18A</h3>
<table>
<tr><th>Full Name</th><td>Ribosomal Protein L18a</td></tr>
<tr><th>Gene Symbol</th><td>RPL18A</td></tr>
<tr><th>Chromosomal Location</th><td>19p13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>6141</td></tr>
<tr><th>OMIM</th><td>604210</td></tr>
<tr><th>Ensembl ID</th><td>ENSG00000105640</td></tr>
<tr><th>UniProt ID</th><td>P62748</td></tr>
<tr><th>Protein Length</th><td>176 amino acids</td></tr>
<tr><th>Protein Molecular Weight</th><td>~20 kDa</td></tr>
<tr><th>Associated Diseases</th><td>[Ribosomopathies](/diseases/ribosomopathies), [Various Cancers](/diseases/cancer), [Viral Infections](/diseases/viral-infections), [Neurodegeneration](/diseases/neurodegeneration)</td></tr>
</table>
</div>

Molecular Function

Role in 60S Ribosomal Subunit

RPL18A is a component of the 60S large ribosomal subunit, contributing to the structural integrity and functional capacity of the ribosome[@warner2009]. As part of the translation machinery, RPL18A participates in:

• Protein synthesis: Contributes to peptide bond formation at the peptidyl transferase center
• Ribosome assembly: Essential for proper 60S subunit biogenesis
• rRNA interaction: Interacts with 28S rRNA to stabilize the large subunit
• Translation termination: Participates in the release factor binding site
• Subunit association: Critical for proper 60S assembly and 80S ribosome formation

Structural Features

RPL18A has several structural features relevant to its function:

• N-terminal domain: Contains RNA-binding regions
• Central region: Involved in protein-protein interactions with other ribosomal proteins
• Surface localization: Positioned to interact with both ribosomal components and extraribosomal factors

Extraribosomal Functions

Beyond its ribosomal role, RPL18A has important extraribosomal functions:

Viral Interaction:

• RPL18A interacts with Dengue virus NS1 protein[@cervantes2015]
• This interaction is required for viral translation and replication
• Suggests role in viral pathogenesis
• May have implications for understanding host-pathogen interactions

• Ribosomal proteins including RPL18A are involved in developmental processes
• Mutations can affect cell migration and tissue patterning[@kim2025]
• Essential for proper embryonic development

Disease Associations

Ribosomopathies

RPL18A is associated with ribosomopathies, a class of disorders characterized by ribosomal dysfunction[@mills2017][@narla2010]:

Disease Spectrum:

• While RPL18A mutations are less common than RPS19 or RPL5 mutations in Diamond-Blackfan anemia
• RPL18A mutations may contribute to the broader ribosomopathy spectrum
• Characterized by impaired ribosome biogenesis leading to translational defects

• Ribosomal protein haploinsufficiency leads to impaired 60S biogenesis
• Ribosomal stress activates p53 through MDM2 inhibition
• Cell type-specific vulnerabilities (particularly erythroid precursors)
• p53-mediated apoptosis reduces affected cell populations

• Growth retardation
• Variable skeletal anomalies
• Predisposition to cancers
• Tissue-specific manifestations depending on the specific protein affected

Cancer Susceptibility

RPL18A has connections to cancer biology through ribosomal dysfunction[@chen2022][@de2015]:

• Ribosomal protein alterations are found in various cancers
• Altered RPL18A expression may contribute to tumor progression
• Ribosomal stress response provides fail-safe against oncogenic transformation
• Context-dependent functions in different cancer types

Viral Infections

RPL18A has a unique connection to viral infections[@cervantes2015]:

Dengue Virus:

• RPL18A directly interacts with Dengue virus NS1 protein
• This interaction is required for efficient viral translation
• Required for viral replication in host cells
• Represents a potential therapeutic target

• Other ribosomal proteins may have similar viral interactions
• Understanding RPL18A's role may inform antiviral strategies
• Host ribosomal proteins as drug targets

Connections to Neurodegeneration

While not directly implicated in neurodegenerative diseases, RPL18A biology informs our understanding of neurodegeneration[@zhou2022][@ding2005]:

Ribosomal Stress and Neuronal Death:

• Chronic ribosomal stress can lead to p53 activation in neurons
• p53 activation can trigger neuronal apoptosis
• Ribosomal dysfunction is observed in Alzheimer's, Parkinson's, and ALS

• Impaired ribosome function disrupts proteostasis
• Protein aggregation is a hallmark of neurodegenerative diseases
• Ribosomal stress response may be relevant to proteostatic failure

• Proper translation is essential for synaptic function
• RPL18A dysfunction may affect neuronal protein synthesis
• May contribute to synaptic failure in neurodegeneration

Expression Pattern

RPL18A is ubiquitously expressed across all tissues, with particularly high expression in:

• Bone marrow (hematopoietic cells)
• Liver
• Brain tissue, particularly in neurons
• Rapidly proliferating cells

Brain Expression

RPL18A expression in the nervous system:

• Expressed in neurons and glial cells
• Important for neuronal protein synthesis
• Required for synaptic function
• May be affected in neurodegenerative conditions

Viral Infection Contexts

During viral infection:

• RPL18A interaction with viral proteins
• May be sequestered for viral translation
• Potential impact on host translation capacity
• Therapeutic target potential

Protein Structure

RPL18A has several structural features:

• RNA-binding domain: Contains regions for 28S rRNA interaction
• Protein interaction sites: Interfaces with other ribosomal proteins
• Surface localization: Positioned to interact with extraribosomal factors

Therapeutic Implications

Ribosomopathies

Therapeutic approaches include:

• Corticosteroids: First-line treatment for DBA; mechanism involves translational enhancement
• L-leucine: Amino acid that improves translation efficiency
• Gene therapy: Autologous hematopoietic stem cell gene addition
• Supportive care: Transfusions for steroid-non-responsive patients

Viral Infections

RPL18A's role in viral replication suggests:

• Antiviral therapy: Targeting host-viral protein interactions
• NS1 inhibitors: Blocking the RPL18A-NS1 interaction
• Host-directed therapy: Modulating ribosomal protein function

Cancer Therapy

Understanding RPL18A has therapeutic implications:

• Ribosome-targeting drugs: Some chemotherapeutics work through ribosomal stress
• Synthetic lethality: RPL18A-deficient cells may be selectively sensitive to certain agents
• Combination therapy: Targeting ribosomal stress pathways

Neurodegeneration

Insights from RPL18A biology inform:

• mTOR modulators: Can reduce ribosomal stress
• p53 modulators: Downstream targeting of stress response
• Translation enhancers: Supporting healthy protein synthesis

Mermaid Diagram: RPL18A in Ribosomal Function and Disease

Cross-References

• [Ribosomopathies](/diseases/ribosomopathies)
• [Diamond-Blackfan Anemia](/diseases/diamond-blackfan-anemia)
• [RPL5 Gene](/genes/rpl5)
• [RPL11 Gene](/genes/rpl11)
• [RPL27 Gene](/genes/rpl27)
• [Ribosomal Proteins](/proteins/ribosomal-proteins)
• [Neurodegeneration](/diseases/neurodegeneration)
• [Viral Infections](/diseases/viral-infections)

External Resources

• [NCBI Gene: RPL18A](https://www.ncbi.nlm.nih.gov/gene/6141)
• [UniProt: RPL18A](https://www.uniprot.org/uniprot/P62748)
• [OMIM: RPL18A](https://www.omim.org/entry/604210)
• [Ensembl: RPL18A](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000105640)

References

See Also

• [Genes](/genes)
• [Ribosomal Proteins](/proteins/ribosomal-proteins)
• [Ribosomopathies](/diseases/ribosomopathies)
• [Neurodegenerative Diseases](/diseases/neurodegeneration)
• [Viral Diseases](/diseases/viral-infections)