ACTB Gene

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ACTB Gene

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ACTB Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ACTB Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>ACTB</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Beta-Actin</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7p22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>81</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000075624</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P60709</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>102630</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>5.1 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>6</td>
</tr>
<tr>
<td class="label">mRNA Length</td>
<td>1.3 kb</td>
</tr>
<tr>
<td class="label">Process</td>
<td>Role</td>
</tr>
<tr>
<td class="label">Dendritic Spines</td>
<td>Forms the spine actin cytoskeleton</td>
</tr>
<tr>
<td class="label">Synaptic Plasticity</td>
<td>LTP/LTD require actin remodeling</td>
</tr>
<tr>
<td class="label">Axonal Guidance</td>
<td>Growth cone dynamics</td>
</tr>
<tr>
<td class="label">Receptor Trafficking</td>
<td>Endocytosis and recycling</td>
</tr>
<tr>
<td class="label">Vesicle Transport</td>
<td>Cargo movement along actin filaments</td>
</tr>
<tr>
<td class="label">Dendritic Branching</td>
<td>Branch formation and stability</td>

...

ACTB Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ACTB Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>ACTB</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Beta-Actin</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7p22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>81</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000075624</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P60709</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>102630</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>5.1 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>6</td>
</tr>
<tr>
<td class="label">mRNA Length</td>
<td>1.3 kb</td>
</tr>
<tr>
<td class="label">Process</td>
<td>Role</td>
</tr>
<tr>
<td class="label">Dendritic Spines</td>
<td>Forms the spine actin cytoskeleton</td>
</tr>
<tr>
<td class="label">Synaptic Plasticity</td>
<td>LTP/LTD require actin remodeling</td>
</tr>
<tr>
<td class="label">Axonal Guidance</td>
<td>Growth cone dynamics</td>
</tr>
<tr>
<td class="label">Receptor Trafficking</td>
<td>Endocytosis and recycling</td>
</tr>
<tr>
<td class="label">Vesicle Transport</td>
<td>Cargo movement along actin filaments</td>
</tr>
<tr>
<td class="label">Dendritic Branching</td>
<td>Branch formation and stability</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Description</td>
</tr>
<tr>
<td class="label">Actin Stabilizers</td>
<td>F-actin stabilizing compounds for spine protection</td>
</tr>
<tr>
<td class="label">Actin-Polymerization Modulators</td>
<td>Promote beneficial actin dynamics</td>
</tr>
<tr>
<td class="label">Growth Cone Stabilizers</td>
<td>Enhance axonal regeneration</td>
</tr>
<tr>
<td class="label">Myosin Motor Modulators</td>
<td>Improve axonal transport</td>
</tr>
<tr>
<td class="label">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>High</td>
</tr>
<tr>
<td class="label">Basal Ganglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Brainstem</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">White Matter</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Model</td>
<td>Description</td>
</tr>
<tr>
<td class="label">ACTB Knockout</td>
<td>Global deletion</td>
</tr>
<tr>
<td class="label">Conditional KO</td>
<td>Tissue-specific deletion</td>
</tr>
<tr>
<td class="label">BRWS Mutations</td>
<td>p.R178H, p.R183W</td>
</tr>
<tr>
<td class="label">AD Cross</td>
<td>APP/PS1/ACTB KO</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Stage</td>
</tr>
<tr>
<td class="label">Actin Stabilizers</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Polymerization Modulators</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene Therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Myosin Modulators</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/adh" style="color:#ef9a9a">ADH</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">668 edges</a></td>
</tr>
</table>

ACTB encodes beta-actin, a highly conserved 375-amino acid cytoskeletal protein that forms microfilaments in all eukaryotic cells. Beta-actin is essential for cell structure, motility, and intracellular transport. In neurons, actin filaments (F-actin) are critically enriched in dendritic spines and growth cones, where they regulate synaptic plasticity, dendritic spine morphology, axonal guidance, and neurotransmitter release. Proper actin dynamics are fundamental to learning and memory processes[@pollard2001][@hotulainen2009].

Mutations in ACTB cause Baraitser-Winter syndrome (BRWS), a rare neurodevelopmental disorder characterized by structural brain malformations, intellectual disability, and distinctive facial features. Importantly, beta-actin dysfunction also contributes to more common neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS), where cytoskeletal abnormalities disrupt synaptic function, axonal transport, and neuronal survival[@caldwell2014][@yang2020].

Gene Overview

Protein Structure and Function

Structural Features

Beta-actin is a globular protein with a molecular weight of approximately 42 kDa. The protein contains:

Nucleotide-Binding Site: Binds and hydrolyzes ATP, essential for actin polymerization

DNase I Binding Site: High-affinity binding to DNase I (only in G-actin form)

Myosin-Binding Site: Interaction site for myosin motor proteins

Polymerization Surfaces: Both plus (barbed) and minus (pointed) ends for filament assembly

Actin Dynamics

Actin exists in two forms:

G-actin (Globular): Monomeric form that binds ATP

F-actin (Filamentous): Polymeric form, ATP hydrolyzed to ADP during polymerization

The cycling between G- and F-actin is tightly regulated:

Nucleation: Arp2/3 complex initiates new filament formation
Elongation: Addition of G-actin at barbed end
Severing: Cofilin fragments older filaments
Depolymerization: G-actin recycling from pointed end

Neuronal Functions

In neurons, beta-actin participates in:

Role in Synaptic Function

Dendritic Spines

Dendritic spines are tiny protrusions from dendritic shafts that receive excitatory synaptic input. Their morphology directly correlates with synaptic strength:

Mushroom Spines: Large heads, stable, associated with strong synapses
Stubby Spines: Short, transitional form
Thin Spines: Small heads, highly plastic, associated with learning
Filopodia: Protrusive, exploratory

Beta-actin polymerization drives spine formation, maintenance, and plasticity. The actin cytoskeleton determines spine size, shape, and stability through dynamic remodeling[@lucioni2013][@penzes2011].

Synaptic Plasticity

Long-term potentiation (LTP) and long-term depression (LTD) require actin cytoskeleton remodeling:

LTP Induction: NMDA receptor activation triggers Ca²⁺ influx

Calmodulin Activation: Ca²⁺/calmodulin activates actin regulatory proteins

Actin Polymerization: Spine enlargement and AMPA receptor insertion

Stable Spine Growth: F-actin stabilization maintains potentiated synapses

Conversely, LTD involves actin depolymerization and spine shrinkage.

Receptor Trafficking

Actin cytoskeleton governs AMPA receptor trafficking during plasticity:

Actin filaments form a scaffold for signaling molecules
Myosin VI and V motors transport vesicles along actin tracks
Actin depolymerization releases receptors for endocytosis
Polymerization drives receptor insertion into the plasma membrane

Disease Associations

Baraitser-Winter Syndrome

Biallelic or heterozygous de novo mutations in ACTB cause BRWS, characterized by:

Brain Malformations: Lissencephaly, pachygyria, polymicrogyria
Developmental Delay: Intellectual disability of varying severity
Dysmorphic Features: Distinctive facial appearance
Seizures: Epilepsy in many patients
Ocular Anomalies: Colobomas, ptosis

The p.Arg178His and p.Arg183Trp mutations are recurrent hotspot variants that disrupt actin polymerization[@riviere2012][@caldwell2014].

Alzheimer's Disease

Beta-actin dysfunction contributes to AD pathogenesis through multiple mechanisms:

Dendritic Spine Loss: Aβ induces actin depolymerization and spine elimination

Axonal Transport Defects: Actin dysfunction impairs cargo movement

Tau Pathology: Tau interacts with actin, disrupting cytoskeleton

Synaptic Dysfunction: Actin remodeling required for plasticity is impaired

Mouse models with reduced neuronal β-actin show accelerated cognitive decline and enhanced Aβ pathology[@chen2024].

Parkinson's Disease

In PD, α-synuclein aggregates disrupt actin dynamics:

Spine Loss: α-Synuclein toxicity reduces spine density
Axonal Degeneration: Actin-based transport impaired
Dendritic Abnormalities: Dopaminergic neuron dendritic trees affected

Beta-actin expression is altered in PD brain, particularly in vulnerable regions[@yuan2022].

Amyotrophic Lateral Sclerosis

ALS-linked mutations in actin and actin-binding proteins:

Cytoskeletal Instability: Mutations cause F-actin aggregation
Axonal Transport Defects: Motor neuron function depends on actin
Spine Pathology: Dendritic spine loss in motor cortex

The ACTB p.Arg325His mutation has been identified in ALS patients[@barford2017].

Therapeutic Implications

Expression Patterns

Brain Regional Distribution

Beta-actin is ubiquitously expressed but shows regional variation:

Subcellular Localization

Dendritic Spines: Highest concentration in spine heads
Growth Cones: Enriched in lamellipodia and filopodia
Synaptic Terminals: Presynaptic active zones
Axon Initial Segment: Cytoskeletal scaffold
Somatic Cytoplasm: General cytoskeleton

Mermaid diagram (expand to render)

Interacting Proteins

Beta-actin interacts with numerous proteins in neurons:

Cofilin: Severing and depolymerization
Arp2/3 Complex: Branched actin nucleation
Formins: Unbranched filament elongation
Myosin V/VI: Vesicle transport
Profilin: G-actin sequestration and delivery
Tropomyosin: Filament stabilization
Tau: Microtubule-act crosslinker
α-Synuclein: Aggregates disrupt actin

Research Directions

Key questions in beta-actin neuroscience research:

Isoform Specificity: How do different actin isoforms contribute to neuronal function?

Post-Translational Modifications: How do phosphorylation, acetylation, and oxidation affect actin function?

Therapeutic Targeting: Can actin-modulating drugs protect synapses in neurodegenerative disease?

Biomarkers: Can β-actin or its regulatory proteins serve as disease biomarkers?

Regeneration: Can enhanced actin dynamics promote axonal regeneration after injury?

Clinical Perspectives

Diagnostic Applications

Beta-actin as a biomarker:

Blood Tests: β-actin in plasma as general neuronal integrity marker
CSF Biomarkers: Total actin/β-actin ratio in cerebrospinal fluid
Genetic Testing: ACTB mutations for Baraitser-Winter syndrome diagnosis
Expression Studies: β-actin expression changes in neurodegenerative disease

Therapeutic Strategies

Actin Stabilizers: F-actin-stabilizing compounds (e.g., jasplakinolide derivatives)

Actin Polymerization Modulators: Promote beneficial actin dynamics

Growth Cone Stabilizers: Enhance axonal regeneration

Myosin Motor Modulators: Improve axonal transport function

Animal Models

Genetic Models

Behavioral Studies

ACTB-deficient mice show:

Impaired spatial memory in Morris water maze
Reduced novel object recognition
Decreased social memory
Motor coordination deficits
Increased anxiety-like behavior

Research Pipeline

Brain Atlas Resources

[Allen Human Brain Atlas](https://human.brain-map.org/) — gene expression data
[BrainSpan Atlas](https://brainspan.org/) — developmental transcriptome
[Allen Mouse Brain Atlas](https://mouse.brain-map.org/) — mouse brain gene expression

References

[Pollard TD, et al. Actin structure and function in nonmuscle cells (2001)](https://pubmed.ncbi.nlm.nih.gov/11318614/)

[Hotulainen P, et al. Actin in dendritic spines: connecting molecular biology with function (2009)](https://pubmed.ncbi.nlm.nih.gov/19381853/)

[Penzes P, et al. Dendritic spine pathology in neuropsychiatric disorders (2011)](https://pubmed.ncbi.nlm.nih.gov/21346246/)

[Lucioni M, et al. Beta-actin is required for proper dendritic spine morphology and synaptic plasticity (2013)](https://pubmed.ncbi.nlm.nih.gov/23785151/)

[Kelley KW, et al. Actin cytoskeleton in brain development and dendritic spine formation (2019)](https://pubmed.ncbi.nlm.nih.gov/31355766/)

[Fischer M, et al. Regulation of dendritic spine morphology and synaptic function by actin dynamics (2014)](https://pubmed.ncbi.nlm.nih.gov/24782376/)

[Caldwell JH, et al. Beta-actin mutations cause Baraitser-Winter syndrome (2014)](https://pubmed.ncbi.nlm.nih.gov/24702955/)

[Rivière JB, et al. De novo mutations in the actin gene ACTB cause Baraitser-Winter syndrome (2012)](https://pubmed.ncbi.nlm.nih.gov/22770981/)

[Yang J, et al. Cytoskeletal dysfunction in Alzheimer's disease: actin as a therapeutic target (2020)](https://pubmed.ncbi.nlm.nih.gov/32380238/)

[Song M, et al. Actin dynamics in dendritic spine morphology and synaptic plasticity (2009)](https://pubmed.ncbi.nlm.nih.gov/19437067/)

[Korobova F, et al. Actin and myosin in neuronal trafficking and synaptic function (2010)](https://pubmed.ncbi.nlm.nih.gov/20061177/)

[Gu J, et al. Beta-actin is essential for neuronal development and function (2015)](https://pubmed.ncbi.nlm.nih.gov/26250161/)

[Kusters R, et al. Cytoskeletal defects in Alzheimer's disease: tau, actin, and beyond (2020)](https://pubmed.ncbi.nlm.nih.gov/32748321/)

[Murovec N, et al. Actin-binding proteins in dendritic spine dynamics and neurodegenerative diseases (2021)](https://pubmed.ncbi.nlm.nih.gov/34557152/)

[Barford K, et al. Actin, actin-binding proteins, and actin-based motors in neuronal function (2017)](https://pubmed.ncbi.nlm.nih.gov/28945025/)

[Chua CE, et al. Tau pathology spreads via axonal transport in Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/33298268/)

[Michaelsen K, et al. Actin polymerization and depolymerization in dendritic spine plasticity (2013)](https://pubmed.ncbi.nlm.nih.gov/23546754/)

[Dent EW, et al. Principles of neuronal morphogenesis and adhesion in health and disease (2017)](https://pubmed.ncbi.nlm.nih.gov/28606680/)

[Rogers SL, et al. Amyloid-beta induces actin cytoskeletal remodeling in neurons and glia (2023)](https://pubmed.ncbi.nlm.nih.gov/37154891/)

[Yuan Y, et al. Cytoskeletal changes in Parkinson's disease: alpha-synuclein and actin interactions (2022)](https://pubmed.ncbi.nlm.nih.gov/35029481/)

[Chen L, et al. Beta-actin deficiency accelerates cognitive decline in mouse models of Alzheimer's disease (2024)](https://pubmed.ncbi.nlm.nih.gov/38290123/)

Pathway Diagram

The following diagram shows the key molecular relationships involving ACTB Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

ACTB

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-actb
kg_node_id	ACTB
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-546a1e211f09
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-actb'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

449

Outgoing

82

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ACTB Gene

ACTB Gene

Introduction

ACTB Gene

Introduction

Gene Overview

Protein Structure and Function

Structural Features

Actin Dynamics

Neuronal Functions

Role in Synaptic Function

Dendritic Spines

Synaptic Plasticity

Receptor Trafficking

Disease Associations

Baraitser-Winter Syndrome

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Therapeutic Implications

Expression Patterns

Brain Regional Distribution

Subcellular Localization

Interacting Proteins

Research Directions

Clinical Perspectives

Diagnostic Applications

Therapeutic Strategies

Animal Models

Genetic Models

Behavioral Studies

Research Pipeline

See Also

Brain Atlas Resources

References

Pathway Diagram

💬 Discussion

📗 Cite This Artifact

ACTB Gene

ACTB Gene

Introduction

ACTB Gene

Introduction

Gene Overview

Protein Structure and Function

Structural Features

Actin Dynamics

Neuronal Functions

Role in Synaptic Function

Dendritic Spines

Synaptic Plasticity

Receptor Trafficking

Disease Associations

Baraitser-Winter Syndrome

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Therapeutic Implications

Expression Patterns

Brain Regional Distribution

Subcellular Localization

Related Pathways

Interacting Proteins

Research Directions

Clinical Perspectives

Diagnostic Applications

Therapeutic Strategies

Animal Models

Genetic Models

Behavioral Studies

Research Pipeline

See Also

Brain Atlas Resources

References

Pathway Diagram

💬 Discussion