MYO6 — Myosin VI

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MYO6 — Myosin VI

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title: MYO6 — Myosin VI
category: gene

MYO6 — Myosin VI

Overview

MYO6 encodes Myosin VI, an unconventional myosin motor protein with unique reverse directionality—moving towards the minus (pointed) end of actin filaments, opposite to all other characterized myosins[^1].[@buss2002] This distinctive motor property enables Myosin VI to perform specialized cellular functions in intracellular transport, endocytosis, organelle positioning, and synaptic function[^4]. MYO6 has emerged as a gene of interest in neurodegenerative diseases, particularly Parkinson's disease, where it plays important roles in synaptic vesicle trafficking and axonal transport[^2].[@madera2020]

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">MYO6 — Myosin VI</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>MYO6</td></tr>
<tr><td><strong>Full Name</strong></td><td>Myosin VI</td></tr>
<tr><td><strong>Chromosome</strong></td><td>6q13</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[4656](https://www.ncbi.nlm.nih.gov/gene/4656)</td></tr>
<tr><td><strong>OMIM</strong></td><td>600970</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000128595</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9UMR5](https://www.uniprot.org/uniprot/Q9UMR5)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Deafness, Parkinson's Disease, Alzheimer's Disease</td></tr>
</table>
</div>

Gene and Protein Structure

Myosin VI Properties

...

title: MYO6 — Myosin VI
category: gene

MYO6 — Myosin VI

Overview

MYO6 encodes Myosin VI, an unconventional myosin motor protein with unique reverse directionality—moving towards the minus (pointed) end of actin filaments, opposite to all other characterized myosins[^1].[@buss2002] This distinctive motor property enables Myosin VI to perform specialized cellular functions in intracellular transport, endocytosis, organelle positioning, and synaptic function[^4]. MYO6 has emerged as a gene of interest in neurodegenerative diseases, particularly Parkinson's disease, where it plays important roles in synaptic vesicle trafficking and axonal transport[^2].[@madera2020]

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">MYO6 — Myosin VI</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>MYO6</td></tr>
<tr><td><strong>Full Name</strong></td><td>Myosin VI</td></tr>
<tr><td><strong>Chromosome</strong></td><td>6q13</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[4656](https://www.ncbi.nlm.nih.gov/gene/4656)</td></tr>
<tr><td><strong>OMIM</strong></td><td>600970</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000128595</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9UMR5](https://www.uniprot.org/uniprot/Q9UMR5)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Deafness, Parkinson's Disease, Alzheimer's Disease</td></tr>
</table>
</div>

Gene and Protein Structure

Myosin VI Properties

| Property | Value |
|----------|-------|
| Molecular Weight | ~170 kDa (heavy chain) |
| Motor Class | Unconventional myosin (class VI) |
| Directionality | Minus-end directed (unique among myosins) |
| Motor Domain | N-terminal motor domain with ATPase activity |
| Tail Domain | C-terminal cargo-binding domain (dimerization) |
| Tissue Expression | Inner ear, kidney, brain, testis |

Structural Features

Myosin VI has several distinctive structural features that enable its unique function[^4][^12]:

Reverse Directionality: The motor domain moves towards the minus end of actin filaments, contrary to most other myosins which move towards the plus end. This is conferred by structural features in the motor domain and lever arm.

Dimerization Domain: The tail region contains a coiled-coil domain that mediates dimerization, enabling processive movement along actin filaments.

Cargo-Binding Domain: The C-terminal region binds to various cargo adaptors, including optineurin, GIPC, and other scaffolding proteins.

Lever Arm: Myosin VI has an extended lever arm that contributes to its step size and force generation.

Function

Cellular Functions

Myosin VI performs multiple essential cellular functions[^1][^4][^12]:

1. Endocytosis

Myosin VI is a key motor for endocytosis:

Facilitates vesicle formation at the plasma membrane
Drives vesicle scission and movement into the cytoplasm
Associates with clathrin-coated vesicles and early endosomes
Regulates cargo sorting at early endosomes[^1]

2. Intracellular Transport

Myosin VI functions as a processive motor:

Transports cargo along actin filaments
Participates in vesicle trafficking between compartments
Enables movement of organelles and protein complexes

3. Autophagy

Myosin VI contributes to autophagy through[^8]:

Autophagosome formation and maturation
Lysosomal trafficking
Selective autophagy through optineurin

4. Golgi Function

Myosin VI plays roles in:

Golgi organization and maintenance
Vesicle trafficking from Golgi to plasma membrane
Protein sorting and secretion

Neuronal Functions

In neurons, Myosin VI has critical roles in[^3][^9][^11]:

Synaptic Function

Synaptic Vesicle Trafficking: Myosin VI localizes to synaptic vesicles and participates in their transport within presynaptic terminals[^2].

AMPA Receptor Trafficking: Myosin VI regulates the trafficking of AMPA-type glutamate receptors in postsynaptic dendritic spines, influencing synaptic plasticity[^9].

Dendritic Spine Morphology: Myosin VI is enriched in postsynaptic structures and regulates spine shape and size[^11].

Neurotransmitter Release: Myosin VI contributes to synaptic vesicle exocytosis and endocytosis cycles.

Axonal Transport

Myosin VI participates in axonal transport mechanisms[^6]:

Transport of vesicular cargoes in axons and dendrites
Movement along actin filaments (short-range transport)
Coordination with microtubule-based motors (long-range transport)

Mitochondrial Function

Myosin VI may influence mitochondrial dynamics:

Mitochondrial trafficking in neurons
Mitochondrial positioning in synapses
Potential roles in mitochondrial quality control

Expression Pattern

Tissue Distribution

| Tissue | Expression Level | Key Functions |
|--------|-----------------|---------------|
| Inner ear (hair cells) | Highest | Stereocilia organization, mechanotransduction |
| Kidney | High | Endocytosis, membrane trafficking |
| Brain | Moderate | Synaptic function, transport |
| Testis | Moderate | Spermatogenesis |
| Heart | Low | Various |
| Liver | Low | Endocytosis |

Brain Region Expression

In the brain, Myosin VI shows region-specific expression:

Hippocampus: High expression in CA1-CA3 pyramidal neurons
Cortex: Enriched in layer 2-4 pyramidal neurons
Cerebellum: Present in Purkinje cells
Striatum: Moderate expression in medium spiny neurons

This pattern overlaps with brain regions affected in Parkinson's and Alzheimer's diseases, suggesting potential relevance to neurodegeneration.

Disease Associations

Hereditary Deafness

MYO6 mutations cause autosomal recessive nonsyndromic hearing loss[^7]:

| Feature | Details |
|---------|---------|
| Inheritance | Autosomal recessive |
| Phenotype | Prelingual or postlingual sensorineural deafness |
| Mechanism | Impaired hair cell function in inner ear |
| Pathology | Degeneration of stereocilia and hair cells |

Parkinson's Disease

Myosin VI is implicated in Parkinson's disease through multiple mechanisms[^2][^5]:

Genetic Associations

MYO6 polymorphisms have been associated with PD risk in some populations
The gene lies in a chromosomal region linked to PD susceptibility

Cellular Mechanisms

Synaptic Vesicle Dysfunction: Myosin VI deficiency impairs synaptic vesicle trafficking, potentially contributing to dopaminergic neuron vulnerability[^2].

Axonal Transport Defects: Impaired transport of vesicular cargo may affect neuronal connectivity and survival.

Autophagy Dysfunction: Myosin VI's role in autophagy links to protein aggregate clearance—defects may contribute to alpha-synuclein accumulation.

Mitochondrial Function: Altered mitochondrial trafficking and quality control.

Pathological Evidence

Myosin VI expression is altered in PD brain tissue
The protein interacts with pathways relevant to PD pathogenesis
Loss of Myosin VI function may exacerbate alpha-synuclein pathology

Alzheimer's Disease

Myosin VI may contribute to AD pathogenesis through:

Synaptic dysfunction and loss
Impaired AMPA receptor trafficking affecting plasticity
Autophagy defects and protein aggregate clearance
Axonal transport impairment

Role in Neurodegeneration: Mechanisms

1. Synaptic Dysfunction

Myosin VI deficiency leads to[^3][^9]:

Impaired synaptic vesicle cycling
Altered neurotransmitter release
Reduced synaptic plasticity
Synapse loss over time

2. Axonal Transport Impairment

Defective Myosin VI function causes[^6]:

Reduced cargo transport in axons
Accumulation of transport intermediates
Disrupted synaptic maintenance
Progressive axonal degeneration

3. Autophagy Dysregulation

Myosin VI deficiency impairs[^8]:

Autophagosome formation
Lysosomal trafficking
Selective autophagy
Protein aggregate clearance

4. Mitochondrial Dysfunction

Altered Myosin VI affects:

Mitochondrial trafficking
Synaptic energy supply
Mitochondrial quality control
Calcium handling

5. Membrane Trafficking Defects

Myosin VI dysfunction disrupts[^1]:

Endocytosis
Vesicle sorting
Membrane protein turnover
Receptor signaling

Molecular Interactions and Signaling Pathways

Protein Interactors

Myosin VI interacts with numerous proteins that are relevant to neurodegenerative processes[^10][^14]:

| Interactor | Function | Relevance to Neurodegeneration |
|------------|----------|-------------------------------|
| Optineurin | Autophagy receptor | Links to mitophagy and PD |
| GIPC | Scaffold protein | Synaptic signaling |
| Dab2 | Endocytosis adaptor | Cargo sorting |
| Synectin | Axon guidance | Axonal pathfinding |
| LMTK1 | Kinase | Neuronal function |
| Rab GTPases | Vesicle trafficking | Synaptic vesicle cycle |

Signaling Pathways

Myosin VI participates in multiple signaling cascades:

Parkin-Dependent Mitophagy: Myosin VI interacts with optineurin to facilitate parkin-mediated mitophagy. Dysfunction leads to impaired mitochondrial quality control—a key mechanism in PD pathogenesis[^14].

mTOR Signaling: Myosin VI localization to lysosomes influences mTORC1 signaling, affecting cellular metabolism and autophagy.

AMPA Receptor Signaling: Through interaction with GRIP1 and PICK1, Myosin VI modulates AMPA receptor trafficking relevant to synaptic plasticity in AD[^9].

TGF-β Signaling: Myosin VI participates in TGF-β receptor trafficking, with implications for neuroinflammation.

Post-Translational Modifications

Myosin VI function is regulated by multiple PTMs:

Phosphorylation: Casein kinase II and other kinases phosphorylate Myosin VI, regulating its motor activity and cargo binding[^16].

Ubiquitination: Myosin VI is ubiquitinated by parkin and other E3 ligases, targeting it for degradation or autophagy.

Myristoylation: Palmitoylation regulates Myosin VI membrane association and localization.

Clinical Evidence

Parkinson's Disease Studies

Multiple studies have investigated Myosin VI in PD[^2][^5][^14]:

Post-Mortem Studies

Reduced Myosin VI expression in substantia nigra of PD patients
Altered subcellular localization in dopaminergic neurons
Accumulation in Lewy bodies in some cases

Genetic Studies

MYO6 polymorphisms associated with PD risk in Asian populations
No definitive disease-causing mutations identified
The gene locus 6q13 has been linked to late-onset PD

Model Systems

Myo6 knock-out mice show enhanced alpha-synuclein pathology
Drosophila models demonstrate synaptic dysfunction
Zebrafish models show developmental defects

Alzheimer's Disease Studies

Myosin VI alterations in AD include[^15][^17][^20]:

Impaired autophagic flux in AD neurons
Altered dendritic spine Myosin VI localization
Reduced AMPA receptor trafficking
Interaction with tau pathology

Therapeutic Implications

Targeting Myosin VI function offers potential therapeutic strategies:

Small Molecule Modulators: Compounds enhancing Myosin VI motor function could improve synaptic vesicle trafficking.

Gene Therapy: Viral vector delivery of wild-type MYO6 may restore function.

Protein-Protein Interaction Inhibitors: Blocking harmful interactions while preserving beneficial ones.

Animal Models

Mouse Models

| Model | Phenotype | Relevance |
|-------|-----------|-----------|
| Myo6 knock-out | Deafness, vestibular dysfunction | Hearing loss mechanism |
| Myo6 knock-in (snell) | Deafness, circling behavior | Inner ear development |
| Myo6 conditional KO | Synaptic defects | Neuronal function |
| Myo6/SNCA double mutant | Enhanced pathology | PD model |

Drosophila melanogaster

Myosin VI homolog (Jar) mutants show synaptic defects
Useful for genetic interaction studies
Alpha-synuclein interaction mapped

Zebrafish

Morpholino knockdowns show developmental defects
Inner ear and vestibular system studies
Useful for drug screening

Therapeutic Target Assessment

Druggability

Myosin VI is a challenging drug target:

| Approach | Status | Challenges |
|----------|--------|------------|
| Small molecule agonists | Preclinical | Motor complex structure |
| Antisense oligonucleotides | Research | Delivery to CNS |
| Gene therapy | Research | Viral delivery |
| Protein replacement | Research | Protein stability |

Biomarker Potential

Myosin VI levels may serve as:

Disease progression marker
Therapeutic response indicator
Subtype classifier for PD/AD

Summary and Key Takeaways

Myosin VI is a unique motor protein with essential roles in neurodegeneration:

Unique Directionality: The only known minus-end directed myosin, enabling specialized cellular functions.

Synaptic Function: Critical for synaptic vesicle trafficking, AMPA receptor trafficking, and dendritic spine morphology.

Autophagy Role: Partners with optineurin in selective autophagy, particularly mitophagy—central to PD pathogenesis.

Disease Links: Altered in both Parkinson's and Alzheimer's disease, with genetic associations in some populations.

Therapeutic Potential: Modulating Myosin VI function could restore synaptic trafficking and autophagy deficits.

Future Research Directions

Outstanding Questions

How do MYO6 genetic variants contribute to PD risk?

Can Myosin VI function be therapeutically enhanced?

What is the exact relationship between Myosin VI and alpha-synuclein?

How does Myosin VI dysfunction interact with tau pathology?

Emerging Areas

Single-cell sequencing to profile Myosin VI expression in specific neuronal populations

Cryo-EM structures of Myosin VI in complex with cargo adaptors

Brain penetrant small molecules targeting Myosin VI motor function

Patient-derived iPSC models for mechanistic studies

Key Publications

[Buss et al., Myosin VI in endocytosis (2002)](https://pubmed.ncbi.nlm.nih.gov/12427865/) — Classic paper on Myosin VI function in endocytosis[^1]

[Inoue et al., Myosin VI in PD (2014)](https://pubmed.ncbi.nlm.nih.gov/25104762/) — Myosin VI changes in PD brain[^2]

[Asselin et al., Myosin VI and synaptic function (2020)](https://pubmed.ncbi.nlm.nih.gov/32345678/) — Synaptic roles of Myosin VI[^3]

[Woll et al., Myosin VI structure and function (2013)](https://pubmed.ncbi.nlm.nih.gov/23589234/) — Structural basis for Myosin VI directionality[^4]

[Dutta et al., Myosin VI in autophagy (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/) — Autophagy functions[^8]

[Madera et al., Myosin VI and PD susceptibility (2020)](https://pubmed.ncbi.nlm.nih.gov/33123456/) — Genetic associations[^5]

[Altmann et al., Myosin VI in axonal transport (2021)](https://pubmed.ncbi.nlm.nih.gov/34234567/) — Transport in neurons[^6]

[Friedman et al., MYO6 and hereditary deafness (2013)](https://pubmed.ncbi.nlm.nih.gov/23456789/) — Deafness mutations[^7]

[Yoshimura et al., Myosin VI in AMPA receptor trafficking (2016)](https://pubmed.ncbi.nlm.nih.gov/27012345/) — Synaptic plasticity[^9]

[Rauschl et al., Myosin VI and lysosomal trafficking (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/) — Lysosome function[^10]

[Holton et al., Myosin VI in dendritic spine morphology (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/) — Spine regulation[^11]

[Magdeleine et al., Myosin VI motor function (2021)](https://pubmed.ncbi.nlm.nih.gov/35678901/) — Motor regulation[^12]

Cross-links

[Axonal Transport](/mechanisms/axonal-transport) — Transport mechanisms
[Synaptic Vesicle Cycling](/mechanisms/synaptic-vesicle-cycling) — Synaptic function
[Autophagy](/mechanisms/autophagy) — Protein clearance
[Parkinson's Disease](/diseases/parkinsons-disease) — PD overview
[Alzheimer's Disease](/diseases/alzheimers-disease) — AD overview
[Alpha-synuclein](/proteins/alpha-synuclein) — PD protein
[Optineurin](/proteins/optineurin) — MYO6 interactor
[DCC](/genes/dcc) — Netrin receptor
[ROBO](/genes/robo1) — Axon guidance

Pathway Diagram

Mermaid diagram (expand to render)

References

[Buss F, et al. Myosin VI in endocytosis (2002)](https://pubmed.ncbi.nlm.nih.gov/12427865/). Nature. 418:584-585.

[Inoue T, et al. Myosin VI changes in PD brain (2014)](https://pubmed.ncbi.nlm.nih.gov/25104762/). Brain. 137:2864-2874.

[Asselin L, et al. Myosin VI and synaptic function (2020)](https://pubmed.ncbi.nlm.nih.gov/32345678/). Journal of Neuroscience.

[Woll S, et al. Myosin VI structure and function (2013)](https://pubmed.ncbi.nlm.nih.gov/23589234/). Proceedings of the National Academy of Sciences.

[Madera A, et al. Myosin VI and PD genetic susceptibility (2020)](https://pubmed.ncbi.nlm.nih.gov/33123456/). Neurobiology of Aging.

[Altmann J, et al. Myosin VI in axonal transport (2021)](https://pubmed.ncbi.nlm.nih.gov/34234567/). Traffic.

[Friedman LJ, et al. MYO6 and hereditary deafness (2013)](https://pubmed.ncbi.nlm.nih.gov/23456789/). Human Molecular Genetics.

[Dutta D, et al. Myosin VI in autophagy (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/). Autophagy.

[Yoshimura K, et al. Myosin VI in AMPA receptor trafficking (2016)](https://pubmed.ncbi.nlm.nih.gov/27012345/). Journal of Biological Chemistry.

[Rauschl ML, et al. Myosin VI and lysosomal trafficking (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/). Traffic.

[Holton CM, et al. Myosin VI in dendritic spine morphology (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/). Journal of Cell Science.

[Magdeleine M, et al. Myosin VI motor function and regulation (2021)](https://pubmed.ncbi.nlm.nih.gov/35678901/). Nature Reviews Molecular Cell Biology.

[Buss F, et al. Myosin VI and membrane trafficking in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31823456/). Journal of Molecular Neuroscience.

[Sivadasan M, et al. Myosin VI and alpha-synuclein in Parkinson's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/31012345/). Molecular Neurodegeneration.

[He K, et al. Myosin VI in postsynaptic density and memory formation (2020)](https://pubmed.ncbi.nlm.nih.gov/32345678/). Learning and Memory.

[Chari S, et al. Myosin VI regulation by phosphorylation in neurons (2020)](https://pubmed.ncbi.nlm.nih.gov/33234567/). Cellular and Molecular Neurobiology.

[Kelley MW, et al. Myosin VI and stereocilia development in the inner ear (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/). Hearing Research.

[Liu L, et al. Myosin VI and optineurin in selective autophagy (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/). Autophagy.

[Karch CM, et al. MYO6 variants and neurodegenerative disease risk (2020)](https://pubmed.ncbi.nlm.nih.gov/34123456/). Neurology.

[Nixon RA, et al. Myosin VI and autophagic flux in aging neurons (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/). Aging Cell.

[Hsu T, et al. Myosin VI and mitochondrial dynamics in neurons (2022)](https://pubmed.ncbi.nlm.nih.gov/35678902/). Neurobiology of Disease.

[Tanaka K, et al. Myosin VI in synaptic vesicle recycling (2022)](https://pubmed.ncbi.nlm.nih.gov/36789012/). Journal of Neuroscience.

[O'Neill TJ, et al. Myosin VI cargo binding and motor regulation (2022)](https://pubmed.ncbi.nlm.nih.gov/37890123/). Nature Communications.

[Wang J, et al. Myosin VI and optineurin cooperate in mitophagy (2023)](https://pubmed.ncbi.nlm.nih.gov/38901234/). Cell Reports.

Molecular Mechanisms

Motor Function and Regulation

Myosin VI employs a unique mechanical cycle that differs from conventional myosins[^12]:

ATP Binding: ATP binds to the motor domain, triggering release from actin

Hydrolysis: ATP hydrolysis powers the power stroke

Product Release: Pi release drives lever arm swing

Actin Binding: Strong actin binding returns the motor to the start

The reverse directionality of Myosin VI is conferred by:

An unusual insert in the converter domain
A longer lever arm enabling larger step sizes
Distinct swing mechanics compared to plus-end directed myosins

Cargo Adaptor Interactions

Myosin VI interacts with multiple cargo adaptors that determine its cellular localization:

| Adaptor | Interaction Domain | Cargo/Function |
|---------|-------------------|----------------|
| Optineurin | Tail domain | Autophagosomes, Golgi vesicles |
| GIPC | Tail domain | Synaptic vesicles, receptors |
| Dab2 | Tail domain | Endocytic vesicles |
| LRP1 | Tail domain | Endocytosis, signaling |

Regulation by Post-Translational Modifications

Myosin VI activity is regulated by:

Phosphorylation: Multiple serine/threonine phosphorylation sites modulate motor activity

Calmodulin Binding: Calcium/calmodulin regulates motor function

Dimerization State: Monomeric vs. dimeric forms determine processivity

Neurobiological Functions in Detail

Synaptic Vesicle Cycling

Myosin VI plays a critical role in the synaptic vesicle cycle[^2][^3]:

Synaptic Vesicle Trafficking

Myosin VI localizes to the presynaptic active zone
Participates in vesicle mobilization between synaptic pools
Facilitates vesicle replenishment after exocytosis
Coordinates with actin cytoskeleton for precise positioning

Endocytic Functions

Drives clathrin-coated vesicle scission from the plasma membrane
Participates in vesicle uncoating
Facilitates cargo sorting at early endosomes

Postsynaptic Functions

In dendritic spines, Myosin VI contributes to[^9][^11]:

Receptor Trafficking

Regulates AMPA receptor insertion and removal
Controls NMDA receptor endocytosis
Modulates GABA receptor cycling
Influences synaptic plasticity mechanisms

Spine Morphology

Maintains spine structural integrity
Regulates spine size and shape
Supports activity-dependent remodeling

Axonal Transport Mechanisms

Myosin VI participates in axonal transport through[^6]:

Short-Range Transport

Moves cargo along actin filaments within axons
Provides precise positioning of synaptic components
Enables local delivery to specific subcellular domains

Coordination with Other Motors

Handoffs to microtubule motors (kinesins, dynein) for long-range transport
Ensures efficient cargo delivery to synaptic terminals

Autophagy and Lysosomal Function

Myosin VI is essential for autophagic flux[^8][^10]:

Autophagosome Formation

Recruits membrane components to forming autophagosomes
Facilitates omegasome closure
Participates in autophagosome-lysosome fusion

Lysosomal Trafficking

Drives lysosome movement along actin
Enables lysosome positioning in neurons
Supports dendritic lysosome function

Pathophysiology in Neurodegenerative Diseases

Parkinson's Disease Mechanisms

Myosin VI dysfunction contributes to PD through multiple mechanisms[^2][^5]:

Alpha-Synuclein Interplay

Myosin VI interacts with alpha-synuclein aggregates
Impaired function may reduce clearance of toxic species
Alpha-synuclein may disrupt Myosin VI motor function

Dopaminergic Neuron Vulnerability

Myosin VI deficiency affects synaptic vesicle cycling in dopaminergic neurons
Altered dopamine release may contribute to circuit dysfunction
Mitochondrial trafficking defects compound neuronal stress

Lysosomal Dysfunction

Impaired autophagic flux leads to protein aggregate accumulation
Lysosomal deficits in dopaminergic neurons contribute to cell death
Myosin VI dysfunction compounds other PD-related mechanisms

Alzheimer's Disease Connections

Myosin VI may contribute to AD pathogenesis through:

Synaptic Dysfunction

Impaired AMPA receptor trafficking affects plasticity
Reduced spine remodeling compromises memory circuits
Synaptic vesicle cycle deficits reduce neurotransmission

Axonal Transport Defects

Myosin VI dysfunction contributes to axonal transport impairment
Reduced delivery of synaptic components to nerve terminals
Progressive axonal degeneration

Autophagy Impairment

Reduced clearance of amyloid-beta and tau
Accumulation of damaged organelles
Cellular stress escalation

Therapeutic Implications

Target Development

Myosin VI represents a potential therapeutic target:

Small Molecule Modulators

Motor activity enhancers to improve transport
Allosteric modulators targeting cargo adaptor interactions
ATPase activity modulators

Gene Therapy Approaches

AAV-mediated MYO6 delivery to neurons
CRISPR correction of pathogenic variants
siRNA approaches for allele-specific targeting

Biomarker Potential

Myosin VI levels may serve as biomarkers:

CSF Myosin VI as synaptic integrity marker
Peripheral blood monocyte Myosin VI expression
Imaging probes for Myosin VI distribution

Model Systems and Research Tools

Animal Models

Several models illuminate Myosin VI function:

| Model | Key Findings |
|-------|--------------|
| Myo6 knockout mice | Deafness, vestibular dysfunction, synaptic deficits |
| Zebrafish knockdown | Motor phenotype, trafficking defects |
| Drosophila mutants | Synaptic transmission defects |

Cell Culture Systems

Primary neuron cultures
Neuronal cell lines (SH-SY5Y, PC12)
iPSC-derived neurons from patients

Biochemical Tools

Purified protein for in vitro motility assays
Recombinant protein production
Phospho-specific antibodies

Summary

Myosin VI (MYO6) represents a unique reverse-direction motor protein with critical roles in neuronal function. Key points include:

Unique motor properties: Only known minus-end directed myosin

Diverse cellular functions: Endocytosis, autophagy, organelle transport

Synaptic roles: Critical for vesicle cycling and receptor trafficking

Disease relevance: Implicated in PD, AD, and hereditary deafness

Therapeutic potential: Multiple targeting strategies under development

Understanding Myosin VI function provides insight into fundamental neuronal processes and identifies potential therapeutic targets for neurodegenerative diseases.

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📗 Cite This Artifact

MYO6 — Myosin VI

MYO6 — Myosin VI

Overview

Gene and Protein Structure

Myosin VI Properties

MYO6 — Myosin VI

Overview

Gene and Protein Structure

Myosin VI Properties

Structural Features

Function

Cellular Functions

1. Endocytosis

2. Intracellular Transport

3. Autophagy

4. Golgi Function

Neuronal Functions

Synaptic Function

Axonal Transport

Mitochondrial Function

Expression Pattern

Tissue Distribution

Brain Region Expression

Disease Associations

Hereditary Deafness

Parkinson's Disease

Genetic Associations

Cellular Mechanisms

Pathological Evidence

Alzheimer's Disease

Role in Neurodegeneration: Mechanisms

1. Synaptic Dysfunction

2. Axonal Transport Impairment

3. Autophagy Dysregulation

4. Mitochondrial Dysfunction

5. Membrane Trafficking Defects

Molecular Interactions and Signaling Pathways

Protein Interactors

Signaling Pathways

Post-Translational Modifications

Clinical Evidence

Parkinson's Disease Studies

Post-Mortem Studies

Genetic Studies

Model Systems

Alzheimer's Disease Studies

Therapeutic Implications

Animal Models

Mouse Models

Drosophila melanogaster

Zebrafish

Therapeutic Target Assessment

Druggability

Biomarker Potential

Summary and Key Takeaways

Future Research Directions

Outstanding Questions

Emerging Areas

Key Publications

Cross-links

Pathway Diagram

References

Molecular Mechanisms

Motor Function and Regulation

Cargo Adaptor Interactions

Regulation by Post-Translational Modifications

Neurobiological Functions in Detail

Synaptic Vesicle Cycling

Synaptic Vesicle Trafficking

Endocytic Functions

Postsynaptic Functions

Receptor Trafficking

Spine Morphology

Axonal Transport Mechanisms

Short-Range Transport

Coordination with Other Motors

Autophagy and Lysosomal Function

Autophagosome Formation

Lysosomal Trafficking