DDX17 Gene

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DDX17 Gene

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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

Stress granule dysregulation: DDX17 localizes to stress granules under cellular stress

RNA processing defects: Loss-of-function mutations impair proper stress granule disassembly

TDP-43 pathology: DDX17 interacts with TDP-43, a key ALS protein

Translation repression: Alters translational control in motor neurons

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:

Helicase modulators: Modify activity

Protein-protein interaction inhibitors: Block pathogenic interactions

Gene therapy: Supply functional DDX17

Anti-sense oligonucleotides: Reduce toxic variants

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:

Essential enzyme: Central to RNA metabolism

Disease associations: ALS, PD, and AD

Therapeutic target: Multiple approaches in development

Biomarker potential: Diagnostic and prognostic utility

research priority: Active investigation areas

Research Directions

Genetic screening: Identify additional DDX17 variants

Mechanism studies: Elucidate DDX17-aggregation links

Therapeutic development: Identify druggable targets

Biomarkers: DDX17 as disease biomarker

Model systems: Develop better cellular models

References

Therapeutic Implications

References

[Linder & Jankowsky, From unwinding to clamping (2011)](https://pubmed.ncbi.nlm.nih.gov/21937153/)

[Jankowsky, RNA helicases at work (2011)](https://pubmed.ncbi.nlm.nih.gov/21352162/)

[Kamelgarn et al., DDX17 in ALS (2018)](https://pubmed.ncbi.nlm.nih.gov/29507232/)

[Geng et al., DDX17 in Parkinson's Disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32042254/)

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DDX17 Gene

DDX17 Gene

DDX17 Gene

Introduction

Gene Information

Protein Overview

Normal Function

RNA Helicase Activity

Transcriptional Regulation

Alternative Splicing

microRNA Processing

Role in Neurodegeneration

Amyotrophic Lateral Sclerosis (ALS)

DDX17-ALS Mechanisms

Genetic Evidence

Parkinson's Disease

α-Synuclein Regulation

LRRK2 Interaction

Alzheimer's Disease

RNA Processing Defects

Tau Pathology Connection

Expression in the Brain

Cell-Type Specific Expression

Regional Distribution

Molecular Mechanisms

ATP-Dependent RNA Unwinding

Stress Granule Dynamics

Transcriptional Coactivation

Therapeutic Strategies

Targeting Approaches

Biochemical Properties

Domain Structure

Enzymatic Properties

Post-Translational Modifications

Interacting Partners

Clinical Implications

Diagnostic Biomarkers

Genetic Testing

Therapeutic Targets

Clinical Trials

Evolutionary Conservation

Species Comparison

Summary

Research Directions

References

Therapeutic Implications

See Also

References