DDX17 Gene

DDX17 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ddx17</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DDX17</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>DEAD-Box Helicase 17</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>22q11.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>16532</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000146001</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9NR11</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DDX17 (p72)</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~72 kDa</td>
</tr>
<tr>
<td class="label">Amino Acids</td>
<td>610 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Nucleus, cytoplasm</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>DEAD-box helicase family</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>DDX17 Expression</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">Substantia Nigra</td>
<td>High</td>
</tr>
<tr>
<td class="label">Spinal Cord</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</t

DDX17 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ddx17</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DDX17</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>DEAD-Box Helicase 17</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>22q11.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>16532</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000146001</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9NR11</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DDX17 (p72)</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~72 kDa</td>
</tr>
<tr>
<td class="label">Amino Acids</td>
<td>610 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Nucleus, cytoplasm</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>DEAD-box helicase family</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>DDX17 Expression</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">Substantia Nigra</td>
<td>High</td>
</tr>
<tr>
<td class="label">Spinal Cord</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Helicase modulation</td>
<td>Modulate activity</td>
</tr>
<tr>
<td class="label">Stress granule therapy</td>
<td>Normalize dynamics</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Restore expression</td>
</tr>
<tr>
<td class="label">Small molecules</td>
<td>Target protein-protein interactions</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Residues</td>
</tr>
<tr>
<td class="label">N-terminal domain</td>
<td>1-150</td>
</tr>
<tr>
<td class="label">Helicase core</td>
<td>151-450</td>
</tr>
<tr>
<td class="label">C-terminal domain</td>
<td>451-610</td>
</tr>
<tr>
<td class="label">C-terminal extension</td>
<td>540-610</td>
</tr>
<tr>
<td class="label">ATPase Km</td>
<td>~1 mM</td>
</tr>
<tr>
<td class="label">Helicase activity</td>
<td>ATP-dependent</td>
</tr>
<tr>
<td class="label">Unwinding rate</td>
<td>~100 bp/s</td>
</tr>
<tr>
<td class="label">Processivity</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Salt optimum</td>
<td>50-150 mM KCl</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">TDP-43</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">FUS</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">p72</td>
<td>Dimerization</td>
</tr>
<tr>
<td class="label">SIRT1</td>
<td>Deacetylase</td>
</tr>
<tr>
<td class="label">SMN complex</td>
<td>Assembly</td>
</tr>
<tr>
<td class="label">Trial</td>
<td>Compound</td>
</tr>
<tr>
<td class="label">Species</td>
<td>Ortholog</td>
</tr>
<tr>
<td class="label">Human</td>
<td>DDX17</td>
</tr>
<tr>
<td class="label">Mouse</td>
<td>Ddx17</td>
</tr>
<tr>
<td class="label">Zebrafish</td>
<td>ddx17</td>
</tr>
<tr>
<td class="label">Drosophila</td>
<td>p72</td>
</tr>
<tr>
<td class="label">C. elegans</td>
<td>hel-1</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Helicase activators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Stress granule modulators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Introduction

DDX17 (DEAD-Box Helicase 17), also known as p72, is a member of the highly conserved DEAD-box RNA helicase family. DDX17 functions as an ATP-dependent RNA helicase with critical roles in transcription regulation, alternative splicing, microRNA processing, and stress response pathways. DDX17 has emerging importance in neurodegenerative diseases including amyotrophic lateral sclerosis (ALS), Parkinson's disease (PD), and Alzheimer's disease (AD) through its roles in RNA metabolism, stress granule dynamics, and protein homeostasis. [@jankowsky2011]

Gene Information

Protein Overview

Normal Function

RNA Helicase Activity

DDX17 possesses ATP-dependent RNA unwinding activity through its conserved helicase core. [@linder2011]

Transcriptional Regulation

DDX17 functions as a transcriptional coactivator for nuclear hormone receptors.

Alternative Splicing

As part of the spliceosome, DDX17 regulates alternative exon inclusion.

microRNA Processing

DDX17 participates in primary microRNA processing.

Role in Neurodegeneration

Amyotrophic Lateral Sclerosis (ALS)

DDX17 has been directly implicated in ALS pathogenesis: [@kamelgarn2018]

• DDX17 mutations identified in familial and sporadic ALS patients
• Alters stress granule dynamics
• Impaired RNA granule clearance in ALS models

DDX17-ALS Mechanisms

Genetic Evidence

• Missense mutations: Several DDX17 missense variants identified in ALS cohorts
• Splice variants: Aberrant splicing of DDX17 transcripts in ALS brain
• Co-aggregation: DDX17 found in ALS inclusions

Parkinson's Disease

DDX17 involvement in PD: [@geng2020]

• Interacts with alpha-synuclein
• Regulates LRRK2 kinase activity
• Modulates mitochondrial function

α-Synuclein Regulation

DDX17 directly regulates α-synuclein expression:

• Transcriptional control: DDX17 affects SNCA transcription
• mRNA stability: Modulates alpha-synuclein mRNA half-life
• Translation regulation: Controls SNCA mRNA translation
• Feedback inhibition: α-Synuclein can inhibit DDX17 function

LRRK2 Interaction

DDX17 interacts with LRRK2, the most common PD-associated kinase:

• Kinase regulation: DDX17 modulates LRRK2 activity
• Substrate targeting: May serve as LRRK2 substrate
• Pathogenic pathways: LRRK2-mediated phosphorylation altered

Alzheimer's Disease

In AD:

• Global RNA processing alterations in AD brain
• Connection to tau pathology
• Effects on neuronal plasticity genes

RNA Processing Defects

AD neurons show widespread RNA processing abnormalities:

• Alternative splicing: Aberrant splicing patterns in AD
• microRNA dysregulation: Altered miRNA processing
• Transport defects: Impaired RNA transport to synapses

Tau Pathology Connection

DDX17 interacts with tau:

• Tau phosphorylation: May affect tau kinase pathways
• Aggregation: Evidence for DDX17 in tau aggregates
• Clearance: Role in tau turnover mechanisms

Expression in the Brain

DDX17 shows region and cell-type specific expression in cortex, hippocampus, basal ganglia, substantia nigra.

Cell-Type Specific Expression

• Neurons: High expression in pyramidal neurons and dopaminergic neurons
• Microglia: Moderate expression, increases in activated states
• Astrocytes: Lower baseline, reactive changes in neurodegeneration
• Oligodendrocytes: Present, affects myelination

Regional Distribution

Molecular Mechanisms

ATP-Dependent RNA Unwinding

DDX17 uses ATP hydrolysis to unwind RNA secondary structures:

• Helicase core: Conserved helicase domains ( motifs I, II, III, IV, V, VI)
• Substrate specificity: Prefers specific RNA structures
• Directionality: 3' to 5' unwinding
• Coupled reactions: Often coupled to ATPase activity

Stress Granule Dynamics

DDX17 localizes to stress granules (SGs):

• Stress response: Recruited to SGs under various stresses
• mRNA sequestration: Temporarily stores translationally arrested mRNAs
• Liquid-liquid phase separation: SG formation via LLPS
• Disassembly: Normally disassembled after stress resolution

Transcriptional Coactivation

DDX17 functions as coactivator:

• Nuclear receptors: Binds to nuclear hormone receptors
• Histone modification: Affects chromatin state
• Mediator complex: Part of transcriptional complexes
• Enhancer RNA: Processes eRNAs from enhancers

Therapeutic Strategies

Targeting Approaches

Biochemical Properties

Domain Structure

DDX17 contains several conserved domains:

The helicase core contains conserved motifs:

• Motif I (Walker A): ATP binding - GxxxxGKST
• Motif II (Walker B): ATP hydrolysis - DEAD
• Motif III: Signal propagation
• Motif IV: RNA interaction
• Motif V: Coupling
• Motif VI: ATP release

Enzymatic Properties

Post-Translational Modifications

DDX17 undergoes various PTMs:

• Phosphorylation: Serine/threonine kinases
• Methylation: Arginine methyltransferases
• Acetyltransferase: p300/CBP
• SUMOylation: SUMO proteins
• Ubiquitination: Degradation signals

Interacting Partners

DDX17 interacts with numerous proteins:

Clinical Implications

Diagnostic Biomarkers

DDX17 has potential as biomarker:

• Blood levels: Altered in neurodegenerative disease
• CSF detection: Measurable in cerebrospinal fluid
• Cellular models: iPSC-derived neurons

Genetic Testing

• Panel testing: Included in ALS/PD gene panels
• Interpretation: Pathogenic vs. benign variants
• Family testing: Cascade screening

Therapeutic Targets

Direct targeting strategies:

Clinical Trials

Evolutionary Conservation

Species Comparison

DDX17 is highly conserved across species:

The conservation suggests essential cellular functions.

Summary

DDX17 is a multifunctional RNA helicase with emerging roles in neurodegeneration. Key points:

Research Directions

References

Therapeutic Implications

See Also

• [DEAD-box RNA helicases](/mechanisms/rna-helicases)
• [ALS genes](/entities/als-genes)
• [Parkinson's disease genes](/entities/parkinsons-genes)

References