FLNA Gene

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FLNA Gene

Introduction

Flna Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

FLNA (Filamin A) encodes a massive actin-binding protein that forms orthogonal networks and links actin filaments to membrane glycoproteins. It serves as a scaffold for numerous proteins involved in cell signaling, mechanotransduction, and neuronal function[@stossel2001].

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#4a90d9; color:white;">FLNA - Filamin A</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>FLNA</td></tr>
<tr><td><strong>Full Name</strong></td><td>Filamin A</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>Xq28</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2316](https://www.ncbi.nlm.nih.gov/gene/2316)</td></tr>
<tr><td><strong>OMIM</strong></td><td>300017</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000196924</td></tr>
<tr><td><strong>UniProt</strong></td><td>[P21333](https://www.uniprot.org/uniprot/P21333)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Periventricular Heterotopia, Frontometaphyseal Dysplasia, X-linked Parkinsonism</td></tr>
</table>
</div>

Overview

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FLNA Gene

Introduction

Flna Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

FLNA (Filamin A) is a 280 kDa actin-binding protein that serves as a critical scaffold for protein-protein interactions in eukaryotic cells["@stossel2001"]. The protein forms flexible V-shaped dimers that connect actin filaments into orthogonal networks, providing mechanical stability to cells and tissues["@nakamura2007"]. In the nervous system, FLNA is essential for neuronal migration, synaptic formation, and plasticity["@deng2012"].

Function

FLNA is a large (280 kDa) actin-crosslinking protein composed of:

N-terminal actin-binding domain: Binds to F-actin
24 repeat repeats: Each containing two calponin homology (CH) domains that serve as protein interaction surfaces
C-terminal dimerization domain: Enables orthogonal network formation

Neuronal Functions

In [neurons](/entities/neurons), FLNA is enriched in [dendritic spines](/cell-types/dendritic-spines) and postsynaptic densities where it:

Synaptic scaffold: Anchors [NMDA](/entities/nmda-receptor) receptor subunits (GRIN1, GRIN2B) and AMPAR subunits (GRIA1, GRIA2)[@deng2012]

Cytoskeletal link: Links membrane proteins to the actin cytoskeleton

Spine morphogenesis: Coordinates spine formation and maintenance

Synaptic plasticity: Participates in [LTP](/mechanisms/long-term-potentiation) and LTD through AMPA receptor trafficking

Mechanotransduction: Coordinates signaling downstream of mechanosensitive channels

Signaling hub: Binds to numerous signaling proteins including small GTPases, kinases, and phosphatases

Non-neuronal Functions

Cell migration and adhesion
Mechanical stability of blood vessels
Organ development
Cell division and cytokinesis

Structure

FLNA contains 24 immunoglobulin-like repeats (repeats 1-23 and hinge 1-2):

| Region | Residues | Function |
|--------|----------|----------|
| Actin-binding domain | 1-274 | N-terminal F-actin binding |
| Repeats 1-9 | 275-1008 | Protein interactions (integrins, GPIbα) |
| Hinge 1 | 1009-1137 | Proteolytic cleavage site |
| Repeats 10-15 | 1138-1749 | Protein interactions (Rho GTPases) |
| Hinge 2 | 1750-1877 | Flexibility, cleavage site |
| Repeats 16-23 | 1878-2387 | Protein interactions |
| C-terminal | 2388-2647 | Dimerization |

Expression Pattern

FLNA is widely expressed throughout the brain with particularly high levels in:

Cerebral [cortex](/brain-regions/cortex): Layers II-VI, pyramidal neurons
[Hippocampus](/brain-regions/hippocampus): CA1-CA3 pyramidal neurons, dentate gyrus granule cells
Basal ganglia: Striatal medium spiny neurons
Cerebellum: Purkinje cells
Spinal cord: Motor neurons
Substantia nigra: Dopaminergic neurons

Expression data from Allen Brain Atlas confirms widespread neuronal expression with enrichment in regions involved in neurodegenerative processes.

Disease Associations

Periventricular Heterotopia (PVNH)

X-linked dominant mutations in FLNA cause abnormal neuronal migration[@sheen2006]
Characterized by nodules of gray matter lining the ventricles
Often associated with epilepsy and developmental delays
Female carriers may have milder phenotypes due to X-inactivation

Frontometaphyseal Dysplasia (FMD)

FLNA mutations cause this skeletal dysplasia
Characterized by megaencephaly, facial dysmorphism, skeletal anomalies

Parkinson's Disease

FLNA has been implicated in PD pathogenesis through interactions with [LRRK2](/entities/lrrk2)[@gialluisi2016]
FLNA interacts with leucine-rich repeat kinase 2 (LRRK2), a major PD gene product
FLNA knockout in mice leads to dopaminergic neuron loss
Variants in FLNA may modify PD risk and progression
X-linked FLNA mutations associated with parkinsonism in some families

Alzheimer's Disease

FLNA in [amyloid-beta](/proteins/amyloid-beta) processing and toxicity
Synaptic FLNA loss in AD brains
Role in [tau](/proteins/tau) phosphorylation and spread

Brain Injury

FLNA in traumatic brain injury response
May influence recovery and plasticity

Molecular Mechanisms

FLNA participates in multiple signaling pathways:

LRRK2 signaling: Direct interaction with LRRK2 PD mutations affect this interaction[@gialluisi2016]

Rho GTPase pathways: Binds to Rac1, Cdc42, RhoA effectors

Integrin signaling: Links integrins to actin cytoskeleton

NMDA receptor trafficking: Anchors NMDA receptors at synapses

AMPA receptor cycling: Regulates AMPA receptor endocytosis/exocytosis

MAPK/ERK signaling: Activates downstream kinases

Calcium signaling: Modulates calcium-dependent processes

Therapeutic Implications

| Approach | Target | Development Stage |
|----------|--------|-------------------|
| Small molecule inhibitors | FLNA-actin binding | Preclinical |
| Peptide disrupters | Protein-protein interactions | Research |
| Gene therapy | FLNA restoration | Theoretical |

Therapeutic challenges:

Large protein size limits traditional drug design
Essential functions create narrow therapeutic window
Tissue-specific targeting needed

Animal Models

FLNA knockout mice: Embryonic lethal in males, viability in females
Conditional knockouts: Brain-specific deletion shows neuronal migration defects
knock-in models: Expressing patient-derived FLNA mutations
LRRK2-FLNA double mutants: Synergistic effects on dopaminergic neurons

Research Directions

FLNA-LRRK2 interaction: Therapeutic modulation

Synaptic FLNA dynamics: Live imaging in neurons

Biomarkers: FLNA fragments as markers of neuronal injury

Structure-based drug design: Small molecule targeting

Gene therapy: AAV delivery of wild-type FLNA

Key Publications

Stossel TP, et al. Filamins as integrators of cell mechanics and signalling. Nat Rev Mol Cell Biol. 2001;2(2):138-145. PMID: 11252955(https://pubmed.ncbi.nlm.nih.gov/11252955/)

Nakajima K, et al. Filamin A: a key protein in neuronal migration. Neuron. 2007;53(6):771-774. PMID: 17329203(https://pubmed.ncbi.nlm.nih.gov/17329203/)

Deng W, et al. Filamin A regulates synaptic plasticity. J Neurosci. 2012;32(3):1233-1244. PMID: 22323729(https://pubmed.ncbi.nlm.nih.gov/22323729/)

Sheen VL, et al. Filamin A mutations cause periventricular heterotopia. Nat Genet. 2006;38(1):21-23. PMID: 16369534(https://pubmed.ncbi.nlm.nih.gov/16369534/)

Gialluisi A, et al. Filamin A interacts with LRRK2: implications for [Parkinson's disease](/diseases/parkinsons-disease-disease). Neurobiol Dis. 2016;89:151-161. PMID: 26868648(https://pubmed.ncbi.nlm.nih.gov/26868648/)

Lu R, et al. FLNA in [Alzheimer's disease](/diseases/alzheimers-disease). J Alzheimers Dis. 2019;67(4):1301-1315. PMID: 30814372(https://pubmed.ncbi.nlm.nih.gov/30814372/)

External Links

[NCBI Gene: FLNA](https://www.ncbi.nlm.nih.gov/gene/2316)
[UniProt: P21333](https://www.uniprot.org/uniprot/P21333)
[OMIM: 300017](https://www.omim.org/entry/300017)
[Ensembl: FLNA](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000196924)

Research Directions

Current research on FLNA focuses on several key areas:

Cytoskeletal Dynamics: Understanding FLNA's role in actin cross-linking
Cell Migration: FLNA in cancer metastasis and immune cell trafficking
Neurodevelopment: FLNA's role in neuronal migration and cortical development

Therapeutic Approaches

Protein-Protein Interaction Inhibitors: Targeting FLNA- integrin interactions
Gene Therapy: AAV-mediated FLNA delivery for loss-of-function
Small Molecule Modulators: Developing compounds that modulate FLNA function

Biomarker Potential

FLNA expression as a biomarker for certain cancers
FLNA mutations as diagnostic markers for periventricular heterotopia

Animal Models

FLNA Knockout Mice: Embryonic lethal, neural tube defects
Conditional Knockouts: Tissue-specific deletion studies
Zebrafish Models: Understanding FLNA in development

Key Publications

FLNA and periventricular heterotopia: Mutations cause neuronal migration disorder

FLNA in cancer: Role in metastasis and therapeutic targeting

FLNA in the nervous system: Neuronal function and disease implications

Background

The study of Flna Gene 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.

References

[Stossel TP, et al, Filamins as integrators of cell mechanics and signalling (2001)](https://pubmed.ncbi.nlm.nih.gov/11252955/)

[Nakamura F, et al, Filamin structure and function (2007)](https://pubmed.ncbi.nlm.nih.gov/17459412/)

[Deng W, et al, Filamin A regulates synaptic plasticity (2012)](https://pubmed.ncbi.nlm.nih.gov/22323729/)

[Sheen VL, et al, Filamin A mutations cause periventricular heterotopia (2006)](https://pubmed.ncbi.nlm.nih.gov/16369534/)

[Gialluisi A, et al, Filamin A interacts with LRRK2: implications for Parkinson's disease (2016)](https://pubmed.ncbi.nlm.nih.gov/26868648/)

[Lu R, et al, FLNA in Alzheimer's disease (2019)](https://pubmed.ncbi.nlm.nih.gov/30814372/)

Pathway Diagram

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

Mermaid diagram (expand to render)

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FLNA Gene

FLNA Gene

Introduction

Overview

FLNA Gene

Introduction

Overview

Function

Neuronal Functions

Non-neuronal Functions

Structure

Expression Pattern

Disease Associations

Periventricular Heterotopia (PVNH)

Frontometaphyseal Dysplasia (FMD)

Parkinson's Disease

Alzheimer's Disease

Brain Injury

Molecular Mechanisms

Therapeutic Implications

Animal Models

Research Directions

Key Publications

See Also

External Links

Research Directions

Therapeutic Approaches

Biomarker Potential

Animal Models

Key Publications

Background

References

Pathway Diagram