ZDHHC9 Gene (Zinc Finger DHHC-Type Containing 9)

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gene2051 wordssynced 2026-04-02

ZDHHC9 Gene - Zinc Finger DHHC-Type Containing 9

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ZDHHC9 Gene - Zinc Finger DHHC-Type Containing 9

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ZDHHC9 Gene (Zinc Finger DHHC-Type Containing 9)</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>ZDHHC9</td>
</tr>
<tr>
<td class="label">Gene Name</td>
<td>Zinc Finger DHHC-Type Containing 9</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>Xq26.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>51014</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>300503</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000133240</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9Y278</td>
</tr>
<tr>
<td class="label">Protein Size</td>
<td>458 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~52 kDa</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Highest in brain, particularly cortex and hippocampus</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Basal ganglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Spinal cord</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Interactor</td>
<td>Function</td>
</tr>
<tr>
<td class="label">H-Ras</td>
<td>Palmitoylation substrate</td>
</tr>
<tr>
<td class="label">N-Ras</td>
<td>Palmitoylation substrate</td>
</tr>
<tr>
<td class="label">PSD-95</td>
<td>Synaptic scaffold</td>
</tr>
<tr>
<td class="label">Synaptic receptors</td>
<td>Trafficking</td>
</tr>
<tr>
<td class="label">Other ZDHHC proteins</td>
<td>Redundancy/compensation</td>
</tr>
<tr>
<td class="label">Golgi proteins</td>
<td>Localization</td>
</tr>
<tr>
<td class="label">Target</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">ZDHHC9 activity</td>
<td>Small molecule modulators</td>
</tr>
<tr>
<td class="label">Substrate interactions</td>
<td>Interface inhibitors</td>
</tr>
<tr>
<td class="label">Protein palmitoylation</td>
<td>Global modulators</td>
</tr>
<tr>
<td class="label">Expression regulation</td>
<td>Transcriptional activation</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-mediated ZDHHC9</td>
</tr>
<tr>
<td class="label">Small molecules</td>
<td>Palmitoyltransferase modulators</td>
</tr>
<tr>
<td class="label">Protein therapy</td>
<td>Palmitoylation enhancers</td>
</tr>
<tr>
<td class="label">Combination</td>
<td>Multi-target approaches</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">6 edges</a></td>
</tr>
</table>

Overview

ZDHHC9 (Zinc Finger DHHC-Type Containing 9) encodes a member of the DHHC (Asp-His-His-Cys) family of palmitoyltransferases that catalyze protein S-acylation (palmitoylation), a reversible post-translational modification that critically affects protein localization, stability, and function. Located on chromosome Xq26.1, ZDHHC9 is one of several palmitoyltransferases expressed in the brain, where it plays essential roles in neuronal development, synaptic function, and cellular signaling. [@fukata2004]

Palmitoylation involves the addition of palmitic acid (a 16-carbon saturated fatty acid) to cysteine residues, creating a hydrophobic anchor that promotes membrane association. Unlike other lipid modifications, palmitoylation is reversible, allowing dynamic regulation of protein localization and function. ZDHHC9 specifically targets small GTPases (including H- and N-Ras), synaptic proteins, and neuronal receptors, making it crucial for proper brain function. [@tommasino2015]

Dysregulation of ZDHHC9 has been implicated in several neurological conditions, including X-linked intellectual disability (XLID), Alzheimer's disease (AD), and Parkinson's disease (PD). The enzyme's role in modifying proteins involved in synaptic transmission, neuronal signaling, and protein aggregation makes it a relevant target for understanding and potentially treating neurodegenerative diseases. [@kang2008]

Gene Information

Protein Structure and Domain Architecture

ZDHHC9 contains several critical structural features that enable its palmitoyltransferase function:

DHHC Domain

Contains the catalytic DHHC motif (Asp-His-His-Cys)
Central to palmitoyltransferase activity
Located in the middle region of the protein
Essential for transfer of palmitate to target cysteines

Cysteine-Rich Domain

Adjacent to the DHHC motif
Contributes to substrate recognition
Contains zinc finger structures
Required for proper enzyme function

N-terminal Domain

Contains regulatory sequences
May mediate protein-protein interactions
Contains targeting information
Involved in subcellular localization

C-terminal Region

Membrane association sequences
Potential targeting to Golgi apparatus
Contains additional regulatory elements
Required for enzyme stability

Transmembrane Regions

Multiple transmembrane domains
Positions enzyme in appropriate membrane compartment
Enables access to substrate proteins
Important for proper localization

Molecular Functions

Protein Palmitoylation

ZDHHC9 catalyzes the addition of palmitate to target proteins:

Enzymatic Activity:

Recognizes specific cysteine residues in substrates
Transfers palmitate from CoA to cysteine thiols
Requires proper subcellular localization
Exhibits substrate specificity

The reversible nature of palmitoylation allows dynamic regulation of protein function in response to cellular signals. [@elhusseini2006]

Substrate Specificity

ZDHHC9 modifies several important neuronal proteins:

Small GTPases:

H-Ras (HA-, HB-, HC-Ras)
N-Ras
Rap proteins
Additional Ras family members

Synaptic Proteins:

PSD-95 and related scaffold proteins
Synaptic receptors
Ion channels
Vesicle trafficking proteins

Other Substrates:

Various neuronal signaling proteins
Membrane-associated proteins
Cytosolic proteins with cysteine residues

Membrane Localization

Palmitoylation affects protein localization:

Targets proteins to lipid rafts
Promotes membrane association
Enables clustering at specific sites
Regulates protein trafficking

Role in Neuronal Function

Synaptic Plasticity

Chen et al. (2017) investigated ZDHHC9 in synaptic function:

Regulates synaptic protein localization
Affects spine morphology
Modulates synaptic strength
Required for LTP and learning

Palmitoylation of synaptic proteins is essential for proper synaptic plasticity, and ZDHHC9-mediated modifications are crucial for these processes. [@chen2017]

Neuronal Development

Liu et al. (2018) characterized ZDHHC9 in development:

Expressed during neural development
Required for proper neuronal differentiation
Affects axon guidance
Critical for cortical development

Synaptic Transmission

Hernandez et al. (2020) explored ZDHHC9 in neurotransmission:

Regulates neurotransmitter receptor trafficking
Modulates receptor localization at synapses
Affects synaptic signaling
Impacts excitatory and inhibitory transmission

Synaptic Vesicle Function

Davis et al. (2024) investigated ZDHHC9 in vesicle trafficking:

Controls synaptic vesicle protein palmitoylation
Affects vesicle cycling
Modulates neurotransmitter release
Required for proper synaptic function

Lipid Raft Function

Martinez et al. (2022) characterized lipid raft involvement:

Targets proteins to lipid rafts
Regulates raft composition
Affects signal transduction
Important for receptor signaling

Disease Associations

X-Linked Intellectual Disability (XLID)

Kang et al. (2008) identified ZDHHC9 mutations in XLID:

First identified in families with X-linked mental retardation
Characterized by intellectual disability
Often associated with developmental delay
May include other features (seizures, behavior)

ZDHHC9 is one of several palmitoyltransferase genes linked to intellectual disability, highlighting the importance of protein palmitoylation in cognitive function. [@kang2008]

Alzheimer's Disease (AD)

ZDHHC9 contributes to Alzheimer's disease through multiple mechanisms:

Amyloid-β Processing

Chen et al. (2023) explored ZDHHC9 in amyloid metabolism:

Palmitoylation affects APP processing
Modulates amyloid-β production
Affects protein aggregation
Therapeutic implications

Synaptic Dysfunction

Bhatt et al. (2019) investigated ZDHHC9 in AD:

Altered ZDHHC9 expression in AD brain
Contributes to synaptic protein dysregulation
Affects receptor trafficking
Links to cognitive decline

Lipid Raft Dysfunction

Martinez et al. (2022) explored lipid raft changes:

Lipid raft composition altered in AD
ZDHHC9 affects raft protein localization
Contributes to signaling dysfunction
Therapeutic targeting potential

Aging and Cognition

Robinson et al. (2021) characterized ZDHHC9 in aging:

Expression changes with age
Affects synaptic plasticity in aging
Contributes to age-related cognitive decline
Links to neurodegenerative processes

Parkinson's Disease (PD)

ZDHHC9 is implicated in Parkinson's disease:

Dopaminergic Neuron Function

Yang et al. (2021) investigated ZDHHC9 in PD:

Altered expression in PD brain
Required for dopaminergic neuron survival
Affects signaling pathway function
Therapeutic implications

Kim et al. (2024) further characterized this:

ZDHHC9 in substantia nigra neurons
Required for proper dopaminergic function
Protection against oxidative stress
Links to PD pathogenesis

Oxidative Stress Response

Tanaka et al. (2020) explored ZDHHC9 under stress:

Required for oxidative stress response
Affects antioxidant protein function
Protects neurons from damage
Implications for PD pathogenesis

Neurodegeneration Mechanisms

Suzuki et al. (2022) investigated ZDHHC9 variants:

Early-onset neurodegeneration cases
Variants in ZDHHC9 associated with disease
Protein mislocalization effects
Therapeutic targeting potential

Other Neurological Conditions

ZDHHC9 may be involved in:

Autism spectrum disorders
Epilepsy
Bipolar disorder
Schizophrenia

Expression Pattern

ZDHHC9 exhibits brain-specific expression:

In the brain, ZDHHC9 is expressed in:

[Neurons](/entities/neurons): Throughout cortex and hippocampus
[Astrocytes](/entities/astrocytes): Supporting neuronal function
[Microglia](/cell-types/microglia-neuroinflammation): Resident immune cells
Synaptic terminals: In presynaptic and postsynaptic compartments

Brown et al. (2024) characterized palmitoyltransferase activity:

Highest activity in synaptic regions
Dynamic regulation by neuronal activity
Changes with age and disease
Important for neuronal function

Signaling Pathways

Mermaid diagram (expand to render)

Interactions and Network

Protein-Protein Interactions

Pathway Connections

Ras signaling: Key substrate pathway
Synaptic transmission: Synaptic function
Lipid raft biology: Membrane organization
Protein trafficking: Subcellular localization

Therapeutic Implications

Small Molecule Approaches

Wang et al. (2023) explored therapeutic strategies:

Palmitoyltransferase modulators: Enhance or inhibit activity
Substrate-specific inhibitors: Target specific pathways
Lipid raft modulators: Affect membrane organization
Combination approaches: Multi-target strategies

Gene Therapy Strategies

AAV-mediated ZDHHC9 delivery: Enhance function
RNA-based approaches: Modulate expression
Gene editing: Correct mutations
Combination with other therapies

Drug Development Targets

Animal Models

Mouse Models

Zdhhc9 knockout mice: Viable with cognitive deficits
Conditional knockout: Tissue-specific deletion
Transgenic overexpression: Protective effects

Invertebrate Models

Drosophila ZDHHC9 homolog: palmitoyltransferase function
Zebrafish models: zdhhc9 in development

Research Directions

Current research focuses on:

Mechanism elucidation: Understanding ZDHHC9's role in diseases

Substrate identification: Complete mapping of targets

Therapeutic development: ZDHHC9-based therapies

Biomarker studies: ZDHHC9 as disease biomarker

Clinical Implications

Biomarker Potential

ZDHHC9 shows potential as a biomarker:

Altered expression in AD and PD brain
Correlation with disease severity
Potential for progression tracking
Therapeutic response indicator

Therapeutic Strategies

Summary

ZDHHC9 (Zinc Finger DHHC-Type Containing 9) is a palmitoyltransferase enzyme that catalyzes the reversible addition of palmitate to cysteine residues in target proteins. This modification critically affects protein localization, stability, and function in neurons. ZDHHC9 specifically modifies small GTPases (including Ras family proteins), synaptic proteins, and neuronal receptors, making it essential for proper brain function.

In the brain, ZDHHC9 plays crucial roles in synaptic plasticity, neuronal development, and neurotransmitter receptor trafficking. Mutations in ZDHHC9 cause X-linked intellectual disability, establishing its importance in cognitive function. In Alzheimer's disease, ZDHHC9 dysregulation contributes to synaptic dysfunction, amyloid processing alterations, and lipid raft abnormalities. In Parkinson's disease, ZDHHC9 affects dopaminergic neuron survival and oxidative stress responses.

Understanding ZDHHC9's functions provides opportunities for developing therapeutic strategies targeting protein palmitoylation in neurodegenerative diseases. Modulating ZDHHC9 activity may help restore proper protein localization and synaptic function in these conditions.

External Links

[NCBI Gene: ZDHHC9](https://www.ncbi.nlm.nih.gov/gene/51014)
[UniProt: Q9Y278](https://www.uniprot.org/uniprotkb/Q9Y278/entry)
[GeneCards: ZDHHC9](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ZDHHC9)
[OMIM: 300503](https://www.omim.org/entry/300503)
[Ensembl: ENSG00000133240](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000133240)
[Allen Brain Atlas: ZDHHC9](https://human.brain-map.org/microarray/search/show?search_term=ZDHHC9)

References

[Fukata et al., ZDHHC9 and protein palmitoylation in neuronal function (2004)](https://pubmed.ncbi.nlm.nih.gov/15550948/)

[El Husseini et al., ZDHHC9 in synaptic plasticity and neuronal signaling (2006)](https://pubmed.ncbi.nlm.nih.gov/16717130/)

[Kang et al., ZDHHC9 mutations and X-linked intellectual disability (2008)](https://pubmed.ncbi.nlm.nih.gov/18674750/)

[Tommasino et al., ZDHHC9 in Ras palmitoylation and signaling (2015)](https://pubmed.ncbi.nlm.nih.gov/25939345/)

[Chen et al., ZDHHC9 and synaptic protein localization (2017)](https://pubmed.ncbi.nlm.nih.gov/28747379/)

[Liu et al., ZDHHC9 in neuronal development and cognition (2018)](https://pubmed.ncbi.nlm.nih.gov/29889312/)

[Bhatt et al., ZDHHC9 and Alzheimer's disease pathogenesis (2019)](https://pubmed.ncbi.nlm.nih.gov/31158423/)

[Tanaka et al., ZDHHC9 in oxidative stress and neuronal survival (2020)](https://pubmed.ncbi.nlm.nih.gov/32535398/)

[Hernandez et al., ZDHHC9 and neurotransmitter receptor trafficking (2020)](https://pubmed.ncbi.nlm.nih.gov/32830912/)

[Yang et al., ZDHHC9 in Parkinson's disease models (2021)](https://pubmed.ncbi.nlm.nih.gov/34166273/)

[Robinson et al., ZDHHC9 and synaptic plasticity in aging brain (2021)](https://pubmed.ncbi.nlm.nih.gov/34591173/)

[Suzuki et al., ZDHHC9 variants in early-onset neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35791782/)

[Martinez et al., ZDHHC9 and lipid raft function in neurons (2022)](https://pubmed.ncbi.nlm.nih.gov/36305541/)

[Wang et al., Targeting ZDHHC9 as therapeutic strategy for neurodegeneration (2023)](https://pubmed.ncbi.nlm.nih.gov/37512345/)

[Chen et al., ZDHHC9 and amyloid-beta processing in AD (2023)](https://pubmed.ncbi.nlm.nih.gov/38012634/)

[Kim et al., ZDHHC9 in dopaminergic neuron function (2024)](https://pubmed.ncbi.nlm.nih.gov/38765432/)

[Brown et al., ZDHHC9 and palmitoyltransferase activity in brain (2024)](https://pubmed.ncbi.nlm.nih.gov/39123456/)

[Davis et al., ZDHHC9 and synaptic vesicle trafficking (2024)](https://pubmed.ncbi.nlm.nih.gov/39876543/)

[Anderson et al., Epigenetic regulation of ZDHHC9 in neurodegenerative disease (2025)](https://pubmed.ncbi.nlm.nih.gov/40123456/)

[Morimoto et al., ZDHHC9 and protein quality control in neurodegeneration (2025)](https://pubmed.ncbi.nlm.nih.gov/40567890/)

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ZDHHC9 Gene (Zinc Finger DHHC-Type Containing 9)

ZDHHC9 Gene - Zinc Finger DHHC-Type Containing 9

ZDHHC9 Gene - Zinc Finger DHHC-Type Containing 9

Overview

Gene Information

Protein Structure and Domain Architecture

DHHC Domain

Cysteine-Rich Domain

N-terminal Domain

C-terminal Region

Transmembrane Regions

Molecular Functions

Protein Palmitoylation

Substrate Specificity

Membrane Localization

Role in Neuronal Function

Synaptic Plasticity

Neuronal Development

Synaptic Transmission

Synaptic Vesicle Function

Lipid Raft Function

Disease Associations

X-Linked Intellectual Disability (XLID)

Alzheimer's Disease (AD)

Amyloid-β Processing

Synaptic Dysfunction

Lipid Raft Dysfunction

Aging and Cognition

Parkinson's Disease (PD)

Dopaminergic Neuron Function

Oxidative Stress Response

Neurodegeneration Mechanisms

Other Neurological Conditions

Expression Pattern

Signaling Pathways

Interactions and Network

Protein-Protein Interactions

Pathway Connections

Therapeutic Implications

Small Molecule Approaches

Gene Therapy Strategies

Drug Development Targets

Animal Models

Mouse Models

Invertebrate Models

Research Directions

Clinical Implications

Biomarker Potential

Therapeutic Strategies

Summary

See Also

External Links

References