DHX36 (DEAH-Box Helicase 36), also known as G4RNA helicase or G4R1, is a member of the DEAH-box family of RNA helicases that recognizes and resolves G-quadruplex (G4) structures in both DNA and RNA. This ATP-dependent helicase plays critical roles in regulating gene expression at multiple levels, including transcription, mRNA translation, and RNA stability. DHX36 has emerged as an important factor in neurodegenerative diseases, particularly Amyotrophic Lateral Sclerosis (ALS), where G-quadruplex dysregulation contributes to RNA metabolism defects.
| Symbol | DHX36 |
|---|---|
| Full Name | DEAH-Box Helicase 36 |
| Aliases | G4RNA helicase, G4R1, DDX36 |
| Chromosomal Location | 3q25.2 |
| NCBI Gene ID | 170506 |
| Ensembl ID | ENSG00000147050 |
| UniProt ID | Q9H2U9 |
| Gene Family | DEAH-box helicase family |
| Associated Diseases | ALS, RTTN, Neurodegeneration, Cancer |
DHX36 is a ~114 kDa protein composed of multiple functional domains that enable its diverse functions:
The unique C-terminal region of DHX36 contains a specific G4-binding domain (G4BD) that distinguishes it from other DEAH-box helicases. This domain specifically recognizes parallel G-quadruplex structures with high affinity[2].
DHX36 is one of the most efficient G-quadruplex unwinding enzymes identified to date[3]. G-quadruplexes are four-stranded DNA/RNA structures formed by stacks of guanine tetrads, which can form in G-rich promoter regions, telomeres, and RNA transcripts. DHX36 resolves these structures through:
DHX36 regulates transcription through multiple mechanisms[4]:
DHX36 modulates mRNA translation at multiple levels[5]:
DHX36 is recruited to stress granules (SGs)—membrane-less organelles formed during cellular stress[6]. In stress conditions:
DHX36 participates in multiple RNA processing pathways:
Key interaction partners include:
DHX36 variants have been associated with increased ALS risk[7][8]. The mechanistic link involves:
While primarily associated with a rare developmental disorder, RTTN involves neural progenitor cell dysfunction where DHX36's role in cell division and gene regulation may be relevant.
The broader connection between DHX36 and neurodegeneration involves[9]:
DHX36 shows high expression in the central nervous system, particularly in:
DHX36 represents a potential therapeutic target for neurodegenerative diseases[10]:
Key open questions include:
Bourbigot et al. DEAH-box helicase structure (2020). Trends in Biochemical Sciences. 2020. ↩︎
Mauger et al. DHX36 G4-binding domain (2015). Nucleic Acids Research. 2015. ↩︎
Vaughn et al. DHX36 G4 helicase function (2015). Proceedings of the National Academy of Sciences. 2015. ↩︎
Takahama et al. DHX36 regulates transcription (2013). Molecular Cell. 2013. ↩︎
Frye et al. DHX36 and translation regulation (2018). RNA Biology. 2018. ↩︎
Japot et al. DHX36 in stress granules (2018). Journal of Cell Science. 2018. ↩︎
Chen et al. DHX36 variants in ALS (2020). Brain. 2020. ↩︎
Sznajder et al. DHX36 and ALS pathogenesis (2018). Acta Neuropathologica Communications. 2018. ↩︎
Silva et al. G-quadruplexes in neurodegeneration (2019). Neurobiology of Aging. 2019. ↩︎
Welters et al. Targeting G4 helicases for therapy (2021). Journal of Medicinal Chemistry. 2021. ↩︎