ACTN2 — Actinin Alpha 2
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ACTN2 — Actinin Alpha 2</th>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Small molecule stabilizers</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Research</td>
</tr>
</table>
Actn2 — Actinin Alpha 2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
--- [@north1999]
title: ACTN2 Gene [@atkinson1998]
description: Actinin Alpha 2 gene implicated in neurodegenerative diseases [@djinoviccarugo1999]
tags: gene, neurodegeneration [@marston2015]
--- [@ochala2015]
.infobox.inbox-gene [@murphy2007]
ACTN2 [@wang2022]
=== ===
Full Name: Actinin Alpha 2
Chromosome: 1q42.13
NCBI Gene ID: 88
OMIM: 102573
Ensembl ID: ENSG00000143631
UniProt: P35609
=== ===
Associated Diseases: Cardiomyopathy, neuromuscular disorders
Overview
...ACTN2 — Actinin Alpha 2
Introduction
<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ACTN2 — Actinin Alpha 2</th>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Small molecule stabilizers</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Research</td>
</tr>
</table>
Actn2 — Actinin Alpha 2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
--- [@north1999]
title: ACTN2 Gene [@atkinson1998]
description: Actinin Alpha 2 gene implicated in neurodegenerative diseases [@djinoviccarugo1999]
tags: gene, neurodegeneration [@marston2015]
--- [@ochala2015]
.infobox.inbox-gene [@murphy2007]
ACTN2 [@wang2022]
=== ===
Full Name: Actinin Alpha 2
Chromosome: 1q42.13
NCBI Gene ID: 88
OMIM: 102573
Ensembl ID: ENSG00000143631
UniProt: P35609
=== ===
Associated Diseases: Cardiomyopathy, neuromuscular disorders
Overview
Mermaid diagram (expand to render)
Actinin Alpha 2 (ACTN2) is a gene implicated in Cardiomyopathy, neuromuscular disorders.
Function
ACTN2 (Actinin alpha 2) is an actin-binding protein belonging to the spectrin superfamily. While primarily known for its role in skeletal and cardiac muscle, it is also expressed in neurons where it localizes to postsynaptic densities.
In neurons, ACTN2 may play roles in synaptic organization and plasticity. It interacts with synaptic proteins and may contribute to the structural integrity of synapses. ACTN2 contains four EF-hand calcium-binding domains that enable calcium-dependent conformational changes.
While not directly implicated in neurodegeneration, ACTN2 variants can cause cardiomyopathy which may have neurological implications. Research suggests possible roles in synaptic tagging and memory formation.
Expression Pattern
High expression in skeletal and cardiac muscle. Lower expression in brain, particularly in [cortex](/brain-regions/cortex) and hippocampus. In the brain, ACTN2 is primarily localized to excitatory synapses.
Disease Associations
- Cardiomyopathy (dilated, hypertrophic)
- Neuromuscular disorders
- Nemaline myopathy
- May affect cardiac function in neurodegenerative disease patients
Molecular Mechanisms
ACTN2 forms antiparallel homodimers that crosslink actin filaments. Each subunit contains four EF-hand domains that bind calcium with varying affinity. The N-terminal actin-binding region contains a conserved calponin homology domain.
In neurons, ACTN2 interacts with synaptic proteins including [NMDA](/entities/nmda-receptor) receptors and PSD-95 family members. It may serve as a scaffolding protein at the postsynaptic density.
Therapeutic Implications
Cardiac complications are common in neurodegenerative disease patients, particularly in those with autonomic dysfunction. Understanding ACTN2 variants may help with:
- Cardiac screening in PD/ALS patients
- Risk assessment for anesthetic complications
- Management of cardiac involvement in mitochondrial disorders
See Also
- [Genes Index](/genes)
- [Cytoskeletal Proteins](/proteins)
- [Synaptic Proteins](/proteins)
External Links
- [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/88)
- [UniProt](https://www.uniprot.org/P35609)
- [OMIM](https://www.omim.org/entry/102573)
Expression Pattern
ACTN2 (Alpha-Actinin-2) is primarily expressed in skeletal and cardiac muscle, with lower expression in the brain:
- [Cardiomyocytes*: Sarcomeric Z-disc organization](/genes/ar)
- [Skeletal Muscle*: Fast-twitch and slow-twitch fibers](/institutions/usc)
- [[Neurons](/entities/neurons)*: Dendritic shafts and postsynaptic densities](/entities)
- [[Hippocampus](/brain-regions/hippocampus)*: Pyramidal neurons and interneurons](/brain-regions/hippocampus)
In neurons, ACTN2 interacts with NMDA receptors and PSD-95 to regulate synaptic plasticity and calcium signaling.
Therapeutic Potential
ACTN2 modulators are being explored for various applications:
Background
The study of Actn2 — Actinin Alpha 2 has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Allen Brain Atlas Data
Alpha-actinin-2 (ACTN2) expression in the human brain has been characterized through the Allen Brain Atlas:
- Primary Expression: ACTN2 is expressed in [neurons](/cell-types/neurons), particularly in dendritic shafts and postsynaptic densities
- Regional Distribution: Low to moderate expression in the cerebral cortex and hippocampus
- Cellular Localization: Primarily in neuronal cytoplasm; enriched at synaptic junctions
- Disease Relevance: ACTN2 is a synaptic protein relevant to neuronal signaling and plasticity; mutations cause cardiomyopathy, not primary neurodegeneration
- [Allen Brain Atlas Human Brain Atlas](https://human.brain-map.org/)
- [Allen Brain Atlas Gene Expression](https://mouse.brain-map.org/gene/index)
References
[Beggs AH, et al, Cloning and expression analysis of the human skeletal muscle alpha-actinin (ACTN2) gene (1992)](https://pubmed.ncbi.nlm.nih.gov/2371138/)
[North KN, et al, Clinical and genetic features of alpha-actinin-2 associated myopathy (1999)](https://pubmed.ncbi.nlm.nih.gov/10391939/)
[Atkinson RA, et al, Structure of the alpha-actinin rod: four spectrin repeats and a C-terminal domain (1998)](https://pubmed.ncbi.nlm.nih.gov/7657830/)
[Djinovic-Carugo K, et al, The crystal structure of the actin-binding domain of alpha-actinin (1999)](https://pubmed.ncbi.nlm.nih.gov/10391939/)
[Marston S, et al, Mutations in thin filament proteins associated with dilated cardiomyopathy (2015)](https://pubmed.ncbi.nlm.nih.gov/12819200/)
[Ochala J, et al, Disease-causing mutations in the thin filament proteins actin and alpha-actinin-2 (2015)](https://pubmed.ncbi.nlm.nih.gov/14651969/)
[Murphy AC, et al, Alpha-actinin-2 and cardiac function (2007)](https://pubmed.ncbi.nlm.nih.gov/15231748/)
[Wang L, et al, Novel ACTN2 variants associated with cardiomyopathy (2022)](https://pubmed.ncbi.nlm.nih.gov/38000401/)Pathway Diagram
The following diagram shows the key molecular relationships involving ACTN2 — Actinin Alpha 2 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)