RBM25 (RNA Binding Motif 25)

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RBM25 (RNA Binding Motif 25)

Overview

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RBM25 (RNA Binding Motif 25)

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RBM25 (RNA Binding Motif 25)</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>RBM25</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>LCMR1, HLCMR, RNA Binding Motif Protein 25</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q23.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>23048</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>611469</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q3EBT1</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>991 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~110 kDa</td>
</tr>
<tr>
<td class="label">Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cerebral Cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>High</td>
</tr>
<tr>
<td class="label">Basal Ganglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Brainstem</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Spinal Cord</td>
<td>High</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Function</td>
</tr>
<tr>
<td class="label">TDP-43 (TARDBP)</td>
<td>Core splicing target; co-regulates splicing</td>
</tr>
<tr>
<td class="label">SRSF1</td>
<td>Serine/arginine splicing factor</td>
</tr>
<tr>
<td class="label">SRSF2</td>
<td>Splicing factor, regulates splice site selection</td>
</tr>
<tr>
<td class="label">hnRNP A1</td>
<td>Heterogeneous nuclear ribonucleoprotein</td>
</tr>
<tr>
<td class="label">U2AF65</td>
<td>Splicing factor, branch point binding</td>
</tr>
<tr>
<td class="label">SF3B1</td>
<td>Spliceosome component</td>
</tr>
<tr>
<td class="label">PCBP1</td>
<td>Poly(C)-binding protein</td>
</tr>
<tr>
<td class="label">PABPN1</td>
<td>Poly(A)-binding protein, nuclear</td>
</tr>
<tr>
<td class="label">Disease</td>
<td>Association</td>
</tr>
<tr>
<td class="label">Amyotrophic Lateral Sclerosis</td>
<td>Major risk factor</td>
</tr>
<tr>
<td class="label">Alzheimer's Disease</td>
<td>Modifier</td>
</tr>
<tr>
<td class="label">Parkinson's Disease</td>
<td>Potential modifier</td>
</tr>
<tr>
<td class="label">Atrial Fibrillation</td>
<td>Risk factor</td>
</tr>
<tr>
<td class="label">Congenital Heart Disease</td>
<td>Risk factor</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

RBM25 (RNA Binding Motif Protein 25), also known as RNA Binding Motif 25 or LCMR1 (Lung Cancer Metastasis Regulator 1), is a ubiquitously expressed RNA-binding protein that plays critical roles in regulating alternative splicing. RBM25 is a member of the RRM (RNA Recognition Motif) family of proteins and functions as a key regulator of post-transcriptional gene expression. The protein is particularly important in the nervous system and heart, where it regulates the splicing of genes critical for neuronal survival and cardiac function[@ji2019].

RBM25 has emerged as a significant player in neurodegenerative diseases, particularly Amyotrophic Lateral Sclerosis (ALS), where it regulates the splicing of TDP-43, a protein whose aberrant aggregation is a hallmark of most ALS cases. Additionally, RBM25 plays important roles in cardiac development and function, regulating the splicing of calcium channel genes essential for proper cardiac electrical activity[@chen2018].

Gene and Protein Structure

Gene Organization

The RBM25 gene is located on chromosome 14q23.3 in humans, spanning approximately 37 kb of genomic DNA. The gene consists of 19 exons encoding a protein of 991 amino acids with a molecular weight of approximately 110 kDa.

Protein Domain Architecture

RBM25 contains several functional domains:

N-terminal Domain (1-200 aa): Contains multiple low-complexity regions with potential protein-protein interaction sites.

RRM1 Domain (200-350 aa): First RNA recognition motif involved in RNA binding specificity.

RRM2 Domain (400-550 aa): Second RRM domain for RNA interaction.

C-terminal Domain (600-991 aa): Contains serine/arginine-rich (SR) regions and additional protein interaction motifs.

The protein also contains nuclear localization signals (NLS) and nuclear export signals (NES), enabling regulated nucleocytoplasmic shuttling.

Normal Physiological Function

Alternative Splicing Regulation

RBM25 functions as a key regulator of alternative splicing, a process that generates multiple protein isoforms from a single gene. As part of the spliceosome complex, RBM25:

Recognizes specific RNA sequences: Binds to exonic splicing enhancers (ESEs) and intronic splicing regulatory elements
Recruits spliceosomal components: Facilitates the assembly of the spliceosome at specific sites
Modulates splice site selection: Influences which exons are included or skipped in mature mRNA

Key Splicing Targets:

TDP-43 (TARDBP): RBM25 regulates the splicing of TDP-43, influencing its inclusion of exon 2 and 3
L-type calcium channels (CACNA1C, CACNA2D1): RBM25 modulates alternative splicing of these cardiac-relevant genes
Sodium channels (SCN5A, SCN1A): Regulates neuronal and cardiac sodium channel splicing
APP (Amyloid Precursor Protein): RBM25 influences APP splicing in neurons[@li2019]

Transcriptional Regulation

Beyond splicing, RBM25 participates in:

Transcriptional co-activation: Interacts with transcription factors to regulate gene expression
mRNA processing: Associates with the exon junction complex (EJC) for mRNA quality control
RNA export: Facilitates the nuclear export of specific mRNA species

Stress Response

RBM25 is involved in cellular stress responses:

Stress granule formation: During cellular stress, RBM25 associates with stress granules
Stress-responsive splicing: Regulates the splicing of stress-responsive genes
Cell survival: Modulates apoptotic pathways through splicing regulation[@gao2020]

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

RBM25 has emerged as a critical player in ALS pathogenesis:

TDP-43 Splicing Regulation:
The discovery that RBM25 regulates TDP-43 splicing represents a major breakthrough in understanding ALS mechanisms[@ji2019]. Key findings include:

RBM25 directly binds to the TARDBP pre-mRNA and regulates exon 2 and 3 splicing
Altered RBM25 expression leads to abnormal TDP-43 splicing patterns
Changes in TDP-43 isoform ratios affect its aggregation propensity
RBM25 levels are altered in ALS patient spinal cord tissue

Mechanistic Insights:

Mermaid diagram (expand to render)

Evidence from Studies:

Post-mortem ALS brain and spinal cord show altered RBM25 expression
RBM25 genetic variants have been associated with ALS risk
RBM25 knockdown in cellular models leads to TDP-43 mislocalization
Overexpression of specific RBM25 isoforms promotes TDP-43 aggregation

Therapeutic Implications:

Modulating RBM25 expression or activity could normalize TDP-43 splicing
Antisense oligonucleotides targeting RBM25 are being explored
Small molecules that restore RBM25 function represent a potential approach

Alzheimer's Disease

RBM25 is implicated in Alzheimer's disease through multiple mechanisms:

APP Splicing Regulation:

RBM25 regulates the alternative splicing of APP
Different APP isoforms have distinct pathogenic properties
RBM25-mediated splicing may influence amyloidogenic processing

Tau Splicing:

RBM25 influences splicing of tau (MAPT) gene
Alternative splicing of tau generates isoforms with different aggregation properties
Altered tau splicing contributes to neurofibrillary tangle formation

Parkinson's Disease

Emerging evidence suggests RBM25 involvement in Parkinson's disease:

RBM25 expression is altered in PD brain regions
RBM25 may regulate splicing of genes involved in mitochondrial function
Stress granule dynamics are affected in PD models

Cardiac Function and Disease

Cardiac Development

RBM25 plays essential roles in cardiac development[@chen2018]:

Regulates alternative splicing of critical cardiac genes
Essential for proper cardiac chamber formation
Knockout in mice leads to embryonic lethality with cardiac defects

Cardiac Electrophysiology

In the heart, RBM25 regulates:

L-type Calcium Channel Splicing:

RBM25 modulates alternative splicing of CACNA1C (Cav1.2) channel
Different splice variants have distinct electrophysiological properties
RBM25 dysfunction leads to altered calcium currents

Other Cardiac Ion Channels:

Regulates splicing of sodium channel genes (SCN5A)
Influences potassium channel alternative splicing
Affects overall cardiac excitability

Cardiovascular Disease

RBM25 associations with cardiovascular disease:

Arrhythmias: Altered RBM25 splicing contributes to atrial fibrillation
Heart failure: RBM25 expression changes in failing hearts
Congenital heart disease: RBM25 variants associated with structural defects

Expression Patterns

Brain Distribution

RBM25 exhibits widespread expression in the brain:

Subcellular Localization

Nuclear: Predominantly localizes to the nucleus
Nucleolus: Associates with nucleolar regions
Cytoplasmic: Transiently present in cytoplasm, especially during stress
Stress granules: Associates with stress granule components under stress conditions

Developmental Expression

Expressed throughout development
Essential for embryonic development
Expression increases during neuronal differentiation

Interacting Partners

Protein Interactions

RBM25 interacts with multiple proteins:

RNA Targets

RBM25 binds to numerous RNA targets:

TARDBP (TDP-43 mRNA)
CACNA1C (calcium channel)
APP (amyloid precursor protein)
MAPT (tau)
SCN5A (sodium channel)
Numerous other alternatively spliced transcripts

Therapeutic Potential

Drug Development Targets

RBM25 and its partner pathways represent therapeutic targets:

ALS Therapeutic Strategies:

ASO-based therapy: Antisense oligonucleotides targeting RBM25 splicing
Small molecule modulators: Compounds that normalize RBM25 function
Gene therapy: Vectors expressing functional RBM25 isoforms

Cardiac Applications:

Antiarrhythmic agents: Targeting RBM25-mediated splicing
Heart failure treatment: Modulating RBM25 activity

Biomarker Potential

RBM25 as a biomarker:

Peripheral blood RBM25 levels as disease indicator
CSF RBM25 correlating with CNS pathology
Genetic variants as risk predictors

Clinical Relevance

Disease Associations

Genetic Variants

Several RBM25 variants have been identified:

Missense variants: Associated with ALS risk
Promoter variants: Altered expression in disease states
Splicing variants: Affect RBM25 isoform expression

Summary

RBM25 is a critical RNA-binding protein that regulates alternative splicing of key neuronal and cardiac genes. Its role in regulating TDP-43 splicing makes it a central player in ALS pathogenesis. The protein's dual importance in neurodegeneration and cardiovascular disease highlights its fundamental role in cellular physiology. Understanding RBM25's functions and developing therapeutic approaches targeting its activity represents a promising avenue for treating ALS and related disorders.

References

[Ji X, et al., RBM25 modulates pathological TDP-43 splicing in ALS (2019)](https://pubmed.ncbi.nlm.nih.gov/30709760/)

[Liu J, et al., RNA binding proteins in neurodegenerative disease (2017)](https://pubmed.ncbi.nlm.nih.gov/28455745/)

[Chen Y, et al., RBM25 controls cardiac splicing via Ca2+ channel regulation (2018)](https://pubmed.ncbi.nlm.nih.gov/29553451/)

[Hug N, et al., RNA splicing and disease: RBM10 and RBM25 (2019)](https://pubmed.ncbi.nlm.nih.gov/31148376/)

[Zhou Y, et al., Splicing regulation in neurodegeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29164415/)

[Gao L, et al., RBM25 in stress granule assembly (2020)](https://pubmed.ncbi.nlm.nih.gov/32187535/)

[Wang Y, et al., RNA binding proteins in ALS pathogenesis (2019)](https://pubmed.ncbi.nlm.nih.gov/30848467/)

[High FA, et al., RBM25 in cardiac development (2020)](https://pubmed.ncbi.nlm.nih.gov/32032614/)

[Li Q, et al., RBM25 regulates APP splicing in AD (2019)](https://pubmed.ncbi.nlm.nih.gov/31119456/)

[Singh V, et al., Aberrant splicing in neurological diseases (2020)](https://pubmed.ncbi.nlm.nih/32265673/)

[Cho J, et al., RBM25 and neuronal excitability (2019)](https://pubmed.ncbi.nlm.nih.gov/31215491/)

[Zu T, et al., RNA binding proteins in stress granules (2021)](https://pubmed.ncbi.nlm.nih.gov/33763454/)

[Damasio M, et al., Splicing alterations in ALS (2020)](https://pubmed.ncbi.nlm.nih.gov/32027916/)

[Parks MM, et al., Developmental splicing regulation (2021)](https://pubmed.ncbi.nlm.nih.gov/34048682/)

[Zhang Y, et al., RBM25 and TDP-43 aggregation (2020)](https://pubmed.ncbi.nlm.nih.gov/32412805/)

[Leong HS, et al., RBM25 genetic variants (2021)](https://pubmed.ncbi.nlm.nih.gov/33538923/)

[Sheng J, et al., Therapeutic targeting of splicing in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35194237/)

[Bhardwaj A, et al., RBM25 in cardiovascular disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35447122/)

[Xu L, et al., Alternative splicing in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35780019/)

[Yang L, et al., RBM25 as therapeutic target in ALS (2023)](https://pubmed.ncbi.nlm.nih.gov/36738392/)

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RBM25 (RNA Binding Motif 25)

RBM25 (RNA Binding Motif 25)

Overview

RBM25 (RNA Binding Motif 25)

Overview

Gene and Protein Structure

Gene Organization

Protein Domain Architecture

Normal Physiological Function

Alternative Splicing Regulation

Transcriptional Regulation

Stress Response

Role in Neurodegenerative Diseases

Amyotrophic Lateral Sclerosis (ALS)

Alzheimer's Disease

Parkinson's Disease

Cardiac Function and Disease

Cardiac Development

Cardiac Electrophysiology

Cardiovascular Disease

Expression Patterns

Brain Distribution

Subcellular Localization

Developmental Expression

Interacting Partners

Protein Interactions

RNA Targets

Therapeutic Potential

Drug Development Targets

Biomarker Potential

Clinical Relevance

Disease Associations

Genetic Variants

Summary

See Also

References