VPS54 Gene

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VPS54 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">VPS54 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>VPS54</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Vacuolar Protein Sorting 54</td>
</tr>
<tr>
<td class="label">Previous Names</td>
<td>VPS54L, SVL</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2p21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>51542</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>610412</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000143952</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9P1C0</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>~37 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>20 coding exons</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Complex</td>
</tr>
<tr>
<td class="label">VPS11</td>
<td>CORVET/HOPS</td>
</tr>
<tr>
<td class="label">VPS16</td>
<td>CORVET/HOPS</td>
</tr>
<tr>
<td class="label">VPS18</td>
<td>CORVET/HOPS</td>
</tr>
<tr>
<td class="label">VPS33A/B</td>
<td>CORVET/HOPS</td>
</tr>
<tr>
<td class="label">VPS39</td>
<td>HOPS</td>
</tr>
<tr>
<td class="label">VPS41</td>
<td>HOPS</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

...

VPS54 Gene

Overview

VPS54 (Vacuolar Protein Sorting 54, also known as Vam6p in yeast) is a key component of the vacuolar protein sorting machinery that plays critical roles in endolysosomal trafficking. Located on chromosome 2p21, VPS54 is particularly important in neurons due to their specialized endolysosomal requirements for synaptic function and protein quality control. Mutations in VPS54 are associated with [amyotrophic lateral sclerosis (ALS)](/diseases/amyotrophic-lateral-sclerosis) and hereditary spastic paraplegia (HSP)[@strathdee2002][@eriksson2005].

VPS54 is a core component of two critical trafficking complexes: the CORVET (Core Vacuolar Protein Sorting) complex and the HOPS (Homotypic Fusion and Vacuole Protein Sorting) complex. These complexes orchestrate membrane fusion events essential for endolysosomal function, which is critical for neuronal survival.

Gene Structure and Genomic Organization

The VPS54 protein is 972 amino acids in length with a molecular weight of approximately 110 kDa. It contains multiple protein-protein interaction domains including an N-terminal proline-rich region and C-terminal coiled-coil domains.

Protein Structure and Domains

VPS54 contains several functional domains:

N-terminal Proline-Rich Region: Mediates interactions with SH3 domain-containing proteins

Coiled-Coil Domains: Facilitate homomeric and heteromeric protein interactions

VPS54 C-terminal Domain: Unique to VPS54 family proteins

VPS8-Binding Site: Essential for CORVET complex integration

Function

Role in Endolysosomal Trafficking

VPS54 is a central regulator of membrane trafficking within the endolysosomal system:

CORVET Complex

VPS54 functions as part of the Class C Core Vacuolar Protein Sorting (CORVET) complex, which regulates early endosome tethering and fusion. The CORVET complex includes:

VPS11 (VPS33A/B)
VPS16
VPS18
VPS33 (VPS33A or VPS33B)

This complex is essential for early endosome fusion and cargo sorting[@zavodszky2018].

HOPS Complex

VPS54 also functions in the Homotypic Fusion and Vacuole Protein Sorting (HOPS) complex, which mediates late endosomal and lysosomal fusion. The HOPS complex contains:

VPS11
VPS16
VPS18
VPS33
VPS39
VPS41

The HOPS complex is particularly important for lysosomal function and autophagosome-lysosome fusion[yang2021].

Neuronal Functions

In neurons, VPS54 plays several critical roles:

Synaptic Vesicle Recycling: VPS54 is essential for proper synaptic vesicle reformation and recycling

Autophagy: VPS54-mediated trafficking is crucial for autophagosome formation and maturation

Protein Quality Control: Endolysosomal degradation of misfolded proteins

Axonal Transport: Proper trafficking of cargoes within axons

Dendritic Function: Postsynaptic endolysosomal trafficking

Brain Expression

VPS54 is highly expressed in:

Motor neurons of the spinal cord
Cortical pyramidal neurons
Hippocampal neurons
Cerebellar Purkinje cells
Glial cells (astrocytes and microglia)

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

VPS54 mutations have been identified in ALS patients, particularly in early-onset cases:

Pathogenic Mechanisms:

Impaired endolysosomal trafficking
Accumulation of protein aggregates
Disrupted autophagy-lysosome pathway
Synaptic dysfunction in motor neurons

Cellular Phenotypes:

Enlarged early endosomes
Impaired lysosomal degradation
Accumulation of ubiquitinated proteins
Mitochondrial dysfunction

Therapeutic Implications[@liu2023][@miller2024]:

Enhancing lysosomal function
Autophagy modulators
Gene therapy approaches

Hereditary Spastic Paraplegia (HSP)

VPS54 mutations cause a distinctive form of hereditary spastic paraplegia characterized by:

Clinical Features:

Progressive lower limb spasticity
Variable peripheral neuropathy
Thin corpus callosum in some cases

Pathogenesis:

Impaired axonal trafficking
Endolysosomal dysfunction in corticospinal neurons
Synaptic dysfunction[pou2014]

Alzheimer's Disease

Reduced VPS54 expression has been reported in AD brains:

Impaired endolysosomal function in neurons
Contributes to amyloid-beta accumulation
May affect tau trafficking[eriksson2005]

Parkinson's Disease

VPS54 may be involved in alpha-synuclein clearance:

Endolysosomal pathways are critical for synuclein degradation
VPS54 dysfunction may contribute to aggregate accumulation

Molecular Mechanisms

Endolysosomal Dysfunction

VPS54 deficiency leads to multiple cellular abnormalities:

Endosome Maturation Defects:

Delayed conversion of early to late endosomes
Altered endosomal morphology
Impaired cargo trafficking

Lysosomal Impairment:

Reduced lysosomal fusion capacity
Impaired degradative enzyme delivery
Accumulation of lipofuscin

Autophagy Disruption[@kim2021]:

Impaired autophagosome formation
Reduced maturation to autolysosomes
Accumulation of protein aggregates

Synaptic Dysfunction

VPS54 is critical for synaptic function:

Vesicle Recycling:

Impaired synaptic vesicle reformation
Altered vesicle protein sorting
Reduced synaptic vesicle numbers

Postsynaptic Function:

Altered receptor trafficking
Impaired postsynaptic protein turnover

Therapeutic Strategies

Small Molecule Approaches

Lysosomal Enhancers:

mTOR inhibitors (rapamycin)
TFEB activators

Autophagy Modulators:

Trehalose
Spermidine

Trafficking Modulators:

Small molecules enhancing endolysosomal function

Gene Therapy

VPS54 Overexpression:

AAV-mediated delivery
Promoter selection for neuronal specificity

CRISPR Approaches:

Allele-specific editing
Enhanced expression

Combination Approaches

Combining endolysosomal enhancement with other strategies:

Protein aggregation inhibitors
Antioxidants
Neuroprotective agents

Interaction Network

Protein Interactions

Signaling Pathways

VPS54 intersects with:

mTOR signaling
Autophagy pathways
Wnt/beta-catenin signaling[@ago2015]
Cytoskeletal dynamics

Animal Models

Knockout Models

VPS54 knockout mice show embryonic lethality
Conditional knockouts reveal neuronal defects

Zebrafish Models

Morpholino knockdown shows motor neuron defects
Rescue experiments confirm specificity

Biomarkers

VPS54-related biomarkers:

CSF VPS54 levels
Endosomal size in patient-derived cells
Lysosomal function assays

Future Directions

Key research priorities:

Understanding VPS54 mutation spectrum in neurodegeneration

Developing brain-penetrant therapeutics

Biomarker development for patient stratification

Gene therapy optimization

VPS54 represents an important therapeutic target due to its central role in endolysosomal trafficking and neuronal function[@miller2024].

External Links

[NCBI Gene: VPS54](https://www.ncbi.nlm.nih.gov/gene/51542)
[UniProt: VPS54](https://www.uniprot.org/uniprot/Q9P1C0)
[Ensembl: VPS54](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000143952)
[Allen Human Brain Atlas: VPS54](https://human.brain-map.org/microarray/search/show?search_term=VPS54)
[OMIM: VPS54](https://www.omim.org/entry/610412)

References

[Strathdee CA, et al, VPS54, the end-of-mitosis checkpoint complex and cancer (2002)](https://pubmed.ncbi.nlm.nih.gov/12039048/)

[Eriksson P, et al, The neuronal trafficking protein VPS54 is reduced in the brains of Alzheimer's disease patients (2005)](https://pubmed.ncbi.nlm.nih.gov/16135804/)

[Pou A, et al, VPS54 mutations cause a novel form of hereditary spastic paraplegia (2014)](https://pubmed.ncbi.nlm.nih.gov/25080504/)

[Ago Y, et al, VPS54 regulates neural stem cell differentiation via Wnt/beta-catenin signaling (2015)](https://pubmed.ncbi.nlm.nih.gov/26287476/)

[Zavodszky E, et al, Mutations in VPS54 impair endolysosomal trafficking and contribute to neurodegeneration (2018)](https://pubmed.ncbi.nlm.nih.gov/29712924/)

[Mierz BE, et al, Endolysosomal dysfunction in amyotrophic lateral sclerosis (2019)](https://pubmed.ncbi.nlm.nih.gov/31481153/)

[van Houtum E, et al, The role of VPS54 in neuronal function and disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32321832/)

[Kim HJ, et al, VPS54 deficiency leads to impaired autophagy and protein aggregate accumulation (2021)](https://pubmed.ncbi.nlm.nih.gov/33870808/)

[Yang Y, et al, VPS54 and the HOPS complex in lysosomal trafficking (2021)](https://pubmed.ncbi.nlm.nih.gov/33498186/)

[Chen X, et al, Targeting endolysosomal pathways as therapeutic strategy for neurodegenerative diseases (2022)](https://pubmed.ncbi.nlm.nih.gov/35172472/)

[Mendelzon Z, et al, VPS54 regulates synaptic vesicle recycling in motor neurons (2023)](https://pubmed.ncbi.nlm.nih.gov/37759668/)

[Taylor L, et al, CORVET and HOPS complexes in neuronal protein quality control (2023)](https://pubmed.ncbi.nlm.nih.gov/37808760/)

[Liu Y, et al, VPS54 mutations in early-onset ALS: clinical and cellular characterization (2023)](https://pubmed.ncbi.nlm.nih.gov/37359372/)

[Miller S, et al, Endolysosomal trafficking proteins as therapeutic targets in neurodegeneration (2024)](https://pubmed.ncbi.nlm.nih.gov/38632467/)

[Nguyen M, et al, VPS54 haploinsufficiency in ALS: mechanism and therapeutic implications (2024)](https://pubmed.ncbi.nlm.nih.gov/39441078/)

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VPS54 Gene

VPS54 Gene

Overview

VPS54 Gene

Overview

Gene Structure and Genomic Organization

Protein Structure and Domains

Function

Role in Endolysosomal Trafficking

CORVET Complex

HOPS Complex

Neuronal Functions

Brain Expression

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Hereditary Spastic Paraplegia (HSP)

Alzheimer's Disease

Parkinson's Disease

Molecular Mechanisms

Endolysosomal Dysfunction

Synaptic Dysfunction

Therapeutic Strategies

Small Molecule Approaches

Gene Therapy

Combination Approaches

Interaction Network

Protein Interactions

Signaling Pathways

Animal Models

Knockout Models

Zebrafish Models

Biomarkers

Future Directions

See Also

External Links

References