RPL27 — Ribosomal Protein L27

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RPL27 — Ribosomal Protein L27

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RPL27 — Ribosomal Protein L27

Introduction

RPL27 (Ribosomal Protein L27) is a component of the 60S large ribosomal subunit and is encoded by the RPL27 gene located on chromosome 17q. RPL27 is one of the many ribosomal proteins that have been increasingly recognized for functions beyond protein synthesis, termed "extraribosomal functions" [1][2]. These include roles in DNA repair, cell cycle regulation, apoptosis, and neuronal development. Within neurons, where protein synthesis is crucial for synaptic plasticity, memory formation, and neuronal survival, ribosomal proteins like RPL27 play critical regulatory roles. Dysregulation of ribosomal protein expression and function has been implicated in neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis [3][4].

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RPL27 — Ribosomal Protein L27

Introduction

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">RPL27 — Ribosomal Protein L27</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>RPL27</td></tr>
<tr><td><strong>Full Name</strong></td><td>ribosomal protein L27</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>17q21.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td><a href="https://www.ncbi.nlm.nih.gov/gene/6157" target="_blank">6157</a></td></tr>
<tr><td><strong>OMIM</strong></td><td><a href="https://www.omim.org/entry/604199" target="_blank">604199</a></td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000131469</td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprot/P61353" target="_blank">P61353</a></td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Ribosomopathy, [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/als)</td></tr>
</table>
</div>

Ribosomal Function

###Ribosome Structure

RPL27 is one of approximately 47 proteins that compose the eukaryotic large (60S) ribosomal subunit, alongside 3 rRNA molecules (28S, 5.8S, 5S). The ribosome catalyzes protein synthesis by:

tRNA binding: Accommodates peptidyl-tRNA and aminoacyl-tRNA
Peptide bond formation: Catalyzes the formation of peptide bonds
Translocation: Moves the ribosome along the mRNA

Protein Synthesis

Within the ribosome, RPL27 participates in:

60S subunit assembly: Component of the large subunit

tRNA binding site: Forms part of the peptidyl transferase center

mRNA binding: Facilitates mRNA-tRNA alignment

Translation fidelity: Ensures accurate protein synthesis

Extraribosomal Functions

DNA Damage Response

RPL27 has been implicated in DNA repair pathways:

p53 regulation: Interacts with p53 and modifies its activity

DNA repair complexes: Associates with repair machinery

Cell cycle control: Modulates cell cycle progression

Genome stability: Maintains genomic integrity

Apoptosis Regulation

RPL27 can modulate apoptotic pathways:

Pro-apoptotic effects: Under certain stress conditions
Anti-apoptotic effects: Via p53-independent pathways
Mitochondrial regulation: Links to intrinsic apoptosis

Neuronal Functions

In neurons, RPL27 has several important roles [5][6][7]:

Synaptic Plasticity

Local translation: Required for synaptic protein synthesis
Synapse formation: Drosophila studies show RPL27 regulates synaptic growth
Plasticity mechanisms: Supports activity-dependent translation

Neuronal Survival

Neurotrophin signaling: Interacts with BDNF and other factors
Stress response: Modulates cellular stress responses
Development: Essential for neuronal development

Expression Pattern

Tissue Distribution

RPL27 is ubiquitously expressed:

Highest: Liver, pancreas (high metabolic activity)
Moderate: Brain, kidney, spleen
Cellular: All proliferating cells

Brain Expression

In the CNS, RPL27 is expressed in:

Neurons: High expression in pyramidal neurons
Astrocytes: Moderate expression
Oligodendrocytes: Required for myelination
Microglia: Lower expression

Synaptic Localization

RPL27 localizes to:

Synaptic vesicles: Present in presynaptic terminals
Dendritic shafts: Distributed in dendrites
Growth cones: High expression during development
Postsynaptic densities: Supports local translation

Role in Neurodegenerative Diseases

Alzheimer's Disease

In AD, ribosomal dysfunction is a prominent feature [14]:

Translation impairment: Reduced protein synthesis capacity

Ribosome availability: Fewer ribosomes available for translation

mRNA sequestration: mRNAs trapped in defective complexes

Synaptic protein loss: Specific vulnerability of synaptic translation

The "Ribosome Stalling Hypothesis" proposes that:

Aberrant proteins stall ribosomes on mRNAs
RPL27 and other proteins are dysregulated
Synaptic proteins are particularly affected

Parkinson's Disease

In PD, RPL27 alterations contribute to:

Dopaminergic neuron vulnerability: Translation deficits

α-Synuclein translation: May alter synuclein expression

Mitochondrial translation: Links to mitochondrial dysfunction

Stress granules: Sequestration in stress conditions

Amyotrophic Lateral Sclerosis (ALS)

In ALS, RPL27 is implicated in:

Motor neuron degeneration: Translation dysregulation

RNA granules: Sequestration in RNA granules

Stress response: Altered stress granule dynamics

TDP-43 pathology: Interaction with TDP-43 aggregates

Ribosomopathies

Ribosomopathies are diseases caused by ribosomal protein dysfunction:

Diamond-Blackfan anemia: RPL5, RPL11 mutations

5q- syndrome: RPL14, RPL5 deletions

T-cell acute lymphoblastic leukemia: RPL10 mutations

Although RPL27 mutations are not a common cause of ribosomopathy, RPL27 dysregulation contributes to disease phenotypes.

Therapeutic Implications

Targeting Translation

Therapeutic strategies include:

Translation modulators: e.g., ISRIB (integrated stress response inhibitor)

mTOR modulators: Rapamycin, resveratrol

Synaptic translation enhancers: Specific targets

Protein Synthesis Boosting

Approaches to enhance protein synthesis:

tRNA modifications: Target tRNA modifying enzymes
Ribosome assembly: Enhance ribosome biogenesis
mRNA stability: Stabilize mRNA transcripts

Stress Response Modulation

Managing cellular stress:

Antioxidants: Reduce oxidative stress
ER stress modulators: UPR modulators
Autophagy enhancers: Clear defective components

Animal Models

Knockout Studies

RPL27 knockout in various models:

Yeast: Essential for viability
Drosophila:show developmental defects [7]
Mice: Embryonic lethal in some backgrounds

Transgenic Models

Overexpression studies show:

Neuroprotection: In some disease models
Cancer association: Altered proliferation

Neuronal Studies

Neuron-specific manipulation:

Synapse formation: Altered synaptic growth
Learning deficits:Impaired memory formation

Mermaid Diagram: RPL27 Functions

Mermaid diagram (expand to render)

Protein Interactions

Ribosomal Partners

| Partner | Function |
|---------|---------|
| 28S rRNA | Large subunit rRNA |
| RPL5 | Ribosomal protein |
| RPL11 | Ribosomal protein |
| RPL23 | Ribosomal protein |

Non-Ribosomal Partners

| Partner | Function |
|---------|---------|
| p53 | Tumor suppressor |
| MDM2 | E3 ubiquitin ligase |
| c-Myc | Transcription factor |
| eIF2α | Translation factor |

Clinical Relevance

Biomarkers

RPL27 expression: May serve as disease marker
Translation capacity: Correlates with disease stage
Therapeutic response: Target engagement

Therapeutic Targets

Translation enhancement: Boost protein synthesis

Ribosome assembly: Improve biogenesis

Stress responses: Manage cellular stress

Key Publications

[Warner and McIntosh, Extraribosomal functions (2009)](https://pubmed.ncbi.nlm.nih.gov/19362532/)

[Warren et al., Ribosome biogenesis in cancer (2012)](https://pubmed.ncbi.nlm.nih.gov/23061042/)

[De Keersmaecker et al., Ribosomes translate cancer (2015)](https://pubmed.ncbi.nlm.nih.gov/26358383/)

[Khodorov et al., Protein synthesis in neurons (2002)](https://pubmed.ncbi.nlm.nih.gov/12031324/)

[Ding et al., Ribosomal proteins in neuronal survival (2005)](https://pubmed.ncbi.nlm.nih.gov/16203865/)

[Besse et al., RPL27 and synaptic growth (2011)](https://pubmed.ncbi.nlm.nih.gov/22022417/)

[Zhou et al., Functions beyond the ribosome (2015)](https://pubmed.ncbi.nlm.nih.gov/25663712/)

[Volpon et al., RPL27 in neuronal development (2018)](https://doi.org/10.1016/j.neuroscience.2018.05.023)

References

[Warner and McIntosh, Extraribosomal functions (2009)](https://pubmed.ncbi.nlm.nih.gov/19362532/)

[Warren et al., Ribosome biogenesis in cancer (2012)](https://pubmed.ncbi.nlm.nih.gov/23061042/)

[Teng et al., RPL5 structure (2013)](https://pubmed.ncbi.nlm.nih.gov/23713252/)

[De Keersmaecker et al., Ribosomes translate cancer (2015)](https://pubmed.ncbi.nlm.nih.gov/26358383/)

[Khodorov et al., Protein synthesis in neurons (2002)](https://pubmed.ncbi.nlm.nih.gov/12031324/)

[Ding et al., Ribosomal proteins in neuronal survival (2005)](https://pubmed.ncbi.nlm.nih.gov/16203865/)

[Besse et al., RPL27 and synaptic growth (2011)](https://pubmed.ncbi.nlm.nih.gov/22022417/)

[Zhou et al., Functions beyond the ribosome (2015)](https://pubmed.ncbi.nlm.nih.gov/25663712/)

[Volpon et al., RPL27 in neuronal development (2018)](https://doi.org/10.1016/j.neuroscience.2018.05.023)

[Kim et al., Ribosomal protein alterations (2020)](https://doi.org/10.1016/j.neurobiolaging.2020.02.012)

[Ma et al., RPL27 and translational control (2019)](https://doi.org/10.1016/j.molcel.2019.02.015)

[Chen et al., Ribosomopathies and neurodegeneration (2021)](https://doi.org/10.1093/hmg/ddab012)

[Liu et al., Ribosomal protein mutations (2022)](https://doi.org/10.1016/j.tig.2022.02.007)

[Yang et al., Extra-ribosomal functions (2020)](https://doi.org/10.1016/j.tcb.2020.01.005)

[Martin et al., Translation dysregulation in AD (2023)](https://doi.org/10.1016/j.neurobiolaging.2022.08.012)

Molecular Mechanisms

Ribosome Assembly

RPL27 contributes to ribosome biogenesis through:

Pre-rRNA processing: Assists in rRNA processing steps

60S assembly: Required for proper large subunit formation

Ribosome export: Nuclear export of 60S subunits

Quality control: Ensures proper assembly

Translation Regulation

RPL27 modulates translation:

Rate limiting: Can be rate-limiting for specific mRNAs

Selective translation: Affects specific transcript classes

Feedback control: Part of ribosome biogenesis feedback

Stress response: Altered under stress conditions

Signaling Integration

RPL27 integrates with signaling pathways:

mTOR pathway: Ribosome biogenesis regulation

p53 pathway: Links DNA damage to translation

MAPK pathway: Stress responses

Integrin signaling: Links to cell adhesion

Disease Mechanisms

Translation Defects in Neurodegeneration

Multiple mechanisms link translation to neurodegeneration:

Global translation reduction: Reduced protein synthesis

Selective translation defects: Specific mRNA classes affected

Ribosome pausing: Stalled translation complexes

RNA granule formation: Pathological RNA granules

Specific Disease Pathways

Alzheimer's Disease

eIF2α phosphorylation: Reduces global translation
mTOR dysregulation: Alters ribosome assembly
Synaptic translation: Specifically affected
Proteostatic stress: Accumulates defective proteins

Parkinson's Disease

Leucine-rich repeat kinase: Linked to translation
Mitochondrial translation: Combined defect
Stress granules: Sequester translation machinery
Autophagy-translation cross-talk: Impaired protein synthesis

ALS

RNA granules: Pathological RNP granules
Translation initiation: Altered eIF4F complex
Ribosome occupancy: Reduced on mRNAs
TDP-43 pathology: Affects translation regulation

Research Directions

Biomarker Development

RPL27 as a potential biomarker:

Blood levels: Easily measurable

Disease correlation: Varies with disease stage

Therapeutic response: Target engagement marker

Therapeutic Targets

Strategies targeting translation:

Translation enhancers: Boost protein synthesis

Ribosome modulators: Improve assembly

Stress response: Modulate integrated stress response

Autophagy enhancers: Clear defective components

Gene Therapy Approaches

Gene therapy for translation defects:

RPL27 overexpression: Increase ribosomal protein levels

Translation factor delivery: eIF4E, eIF4G delivery

Ribosome engineering: Modified ribosomes

mRNA therapy: mRNA-based protein expression

Molecular Interactions

Protein-Protein Interactions

| Partner | Interaction Type | Functional Consequence |
|---------|------------------|------------------------|
| RPL5 | Direct binding | Ribosome assembly |
| RPL11 | Direct binding | Ribosome assembly |
| RPL23 | Indirect | Ribosome stability |
| RPL28 | Co-complex | Cofunctional |
| p53 | Direct binding | DNA damage response |
| MDM2 | Indirect regulation | p53 regulation |
| eIF4E | Functional link | Translation initiation |
| eIF4G | Functional link | Translation initiation |

RNA Interactions

RPL27 interacts with:

5S rRNA: Component of ribosome
28S rRNA: Large subunit rRNA
5.8S rRNA: Small subunit rRNA
mRNA: Translated transcripts

Comparative Biology

Evolutionary Conservation

RPL27 is highly conserved across species:

Yeast: Essential for viability
Drosophila: Developmental function
Zebrafish: Development
Mouse: Essential
Human: Functional conservation

Ortholog Studies

Model organism studies reveal:

Drosophila RPL27: Synaptic function critical
Zebrafish RPL27: Developmental required
Mouse RPL27: Embryonic lethal when null

Clinical Relevance

Diagnostic Applications

RPL27 in diagnostics:

Disease biomarkers: Altered in neurodegeneration

Therapeutic monitoring: Treatment response

Disease progression: Stage correlation

Clinical Trials

Translation-targeted therapies in trials:

ISRIB: Integrated stress response inhibitor

eIF4E inhibitors: mTOR-independent targets

Ribosome enhancers: Direct ribosomal protein targeting

Summary and Future Directions

The field of ribosomal biology and neurodegeneration continues to evolve. Key questions remain:

Mechanism specificity: How does RPL27 contribute specifically to neurons?

Therapeutic targeting: Can translation be safely enhanced?

Disease selectivity: Why are specific neurons vulnerable?

Combination approaches: How to combine with other therapies?

Future research directions include:

Single-cell analysis: Neuron-type specific responses
Temporal dynamics: Time-resolved molecular studies
Therapeutic development: Translation-enhancing drugs
Biomarker development: Patient stratification

💬 Discussion

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slug	genes-rpl27
kg_node_id	RPL27
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-62e81a5823cf
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-rpl27'}
_schema_version	1

📗 Cite This Artifact

RPL27 — Ribosomal Protein L27

RPL27 — Ribosomal Protein L27

Introduction

RPL27 — Ribosomal Protein L27

Introduction

Ribosomal Function

Protein Synthesis

Extraribosomal Functions

DNA Damage Response

Apoptosis Regulation

Neuronal Functions

Synaptic Plasticity

Neuronal Survival

Expression Pattern

Tissue Distribution

Brain Expression

Synaptic Localization

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Ribosomopathies

Therapeutic Implications

Targeting Translation

Protein Synthesis Boosting

Stress Response Modulation

Animal Models

Knockout Studies

Transgenic Models

Neuronal Studies

Mermaid Diagram: RPL27 Functions

Protein Interactions

Ribosomal Partners

Non-Ribosomal Partners

Clinical Relevance

Biomarkers

Therapeutic Targets

Key Publications

References

Molecular Mechanisms

Ribosome Assembly

Translation Regulation

Signaling Integration

Disease Mechanisms

Translation Defects in Neurodegeneration

Specific Disease Pathways

Alzheimer's Disease

Parkinson's Disease

ALS

Research Directions

Biomarker Development

Therapeutic Targets

Gene Therapy Approaches

Molecular Interactions

Protein-Protein Interactions

RNA Interactions

Comparative Biology

Evolutionary Conservation

Ortholog Studies

Clinical Relevance

Diagnostic Applications

Clinical Trials

Summary and Future Directions

See Also

💬 Discussion