DNAJC26 (also known as G3BP2 - Ras GTPase-Activating Protein-Binding Protein 2) is a stress granule-associated protein that plays critical roles in RNA metabolism, stress response, and protein homeostasis. It is a member of the DNAJ/Hsp40 family of molecular chaperones and has been increasingly recognized for its involvement in neurodegenerative diseases, particularly amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD)[@wolozin2019].
Gene Information
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | DNAJC26 (G3BP2) | | Gene Name | DnaJ Heat Shock Protein Family Member C26 | | Aliases | G3BP2, RAS-GTPASE-ACTIVATING PROTEIN-BINDING PROTEIN 2 | | Chromosomal Location | 4p16.3 | | NCBI Gene ID | [9907](https://www.ncbi.nlm.nih.gov/gene/9907) | | OMIM | [604393](https://www.omim.org/entry/604393) | | UniProt | [Q9UQF2](https://www.uniprot.org/uniprot/Q9UQF2) |
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Function
Stress Granule Biology
DNAJC26/G3BP2 is a central component of stress granules (SGs), membrane-less organelles that form in response to cellular stress. Key functions include:
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title: DNAJC26 Gene
DNAJC26 Gene
Overview
DNAJC26 (also known as G3BP2 - Ras GTPase-Activating Protein-Binding Protein 2) is a stress granule-associated protein that plays critical roles in RNA metabolism, stress response, and protein homeostasis. It is a member of the DNAJ/Hsp40 family of molecular chaperones and has been increasingly recognized for its involvement in neurodegenerative diseases, particularly amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD)[@wolozin2019].
Gene Information
<div class="infobox infobox-gene">
| Property | Value | |----------|-------| | Gene Symbol | DNAJC26 (G3BP2) | | Gene Name | DnaJ Heat Shock Protein Family Member C26 | | Aliases | G3BP2, RAS-GTPASE-ACTIVATING PROTEIN-BINDING PROTEIN 2 | | Chromosomal Location | 4p16.3 | | NCBI Gene ID | [9907](https://www.ncbi.nlm.nih.gov/gene/9907) | | OMIM | [604393](https://www.omim.org/entry/604393) | | UniProt | [Q9UQF2](https://www.uniprot.org/uniprot/Q9UQF2) |
</div>
Function
Stress Granule Biology
DNAJC26/G3BP2 is a central component of stress granules (SGs), membrane-less organelles that form in response to cellular stress. Key functions include:
mRNA Binding and Regulation — G3BP2 binds to specific mRNA sequences and regulates translation during stress[@matsumoto2015]
Stress Granule Assembly — Acts as a scaffold protein, nucleating stress granule formation through interactions with multiple SG components
Translation Repression — Participates in mechanisms that stall translation under stress conditions
mRNA Decay — Associates with machinery involved in mRNA degradation pathways
Protein-Protein Interactions
G3BP2 interacts with several proteins relevant to neurodegeneration:
TDP-43 — Sequestration of TDP-43 in stress granules is a hallmark of ALS/FTD[@nonaka2023]
FUS — Another ALS/FTD-associated protein that localizes to stress granules
TGF-β Signaling — Modulates cellular signaling pathways relevant to neuroinflammation
Disease Associations
Amyotrophic Lateral Sclerosis (ALS)
DNAJC26/G3BP2 is genetically and functionally linked to ALS:
Genetic Associations — Rare variants in DNAJC26 have been identified in ALS patients[@markovinovic2022]
Stress Granule Dysregulation — G3BP2-positive stress granules are altered in ALS, with abnormal persistence and composition
Protein Aggregation — G3BP2 is found in pathological inclusions in ALS/FTD brains
Frontotemporal Dementia (FTD)
G3BP2 pathology is observed in FTD subtypes, particularly in cases with TDP-43 pathology
Stress granule dysfunction contributes to the characteristic protein aggregation in FTD
Neurodegeneration
Protein Homeostasis Failure — G3BP2 dysfunction impairs the cellular machinery for protein quality control