ARHGAP1 Gene

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ARHGAP1 Gene

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ARHGAP1 Gene

| Property | Value |
|----------|-------|
| Gene Symbol | ARHGAP1 |
| Full Name | Rho GTPase Activating Protein 1 |
| Chromosomal Location | 11p15.5 |
| NCBI Gene ID | 393 |
| OMIM ID | 602737 |
| Ensembl ID | ENSG00000103540 |
| UniProt ID | Q9UINT8 |
| Encoded Protein | Rho GTPase-activating protein 1 |
| Protein Family | Rho GTPase activating protein family |
| Molecular Weight | ~22 kDa |
| Tissue Expression | Brain, heart, lung, kidney, testis |

</div>

Overview

ARHGAP1 (Rho GTPase Activating Protein 1), also known as p190RhoGAP or ARHGAP1, is a critical regulator of Rho GTPases. Rho GTPases are molecular switches that control a wide range of cellular processes including actin cytoskeleton dynamics, cell adhesion, cell migration, and vesicle trafficking. ARHGAP1 is one of the largest families of GTPase-activating proteins, with over 70 members in humans, and specifically targets RhoA, Rac1, and Cdc42 for hydrolysis of GTP to GDP, thereby inactivating these signaling molecules [@arhgap1_function].

The ARHGAP1 protein is characterized by an N-terminal Sar GTPase-activating protein (GAP) domain, followed by additional regulatory domains that mediate protein-protein interactions. ARHGAP1 is ubiquitously expressed with particularly high levels in the nervous system, where it plays essential roles in neuronal development, synaptic plasticity, and axonal transport [@arhgap1_neurite].

...

ARHGAP1 Gene

| Property | Value |
|----------|-------|
| Gene Symbol | ARHGAP1 |
| Full Name | Rho GTPase Activating Protein 1 |
| Chromosomal Location | 11p15.5 |
| NCBI Gene ID | 393 |
| OMIM ID | 602737 |
| Ensembl ID | ENSG00000103540 |
| UniProt ID | Q9UINT8 |
| Encoded Protein | Rho GTPase-activating protein 1 |
| Protein Family | Rho GTPase activating protein family |
| Molecular Weight | ~22 kDa |
| Tissue Expression | Brain, heart, lung, kidney, testis |

</div>

Overview

ARHGAP1 (Rho GTPase Activating Protein 1), also known as p190RhoGAP or ARHGAP1, is a critical regulator of Rho GTPases. Rho GTPases are molecular switches that control a wide range of cellular processes including actin cytoskeleton dynamics, cell adhesion, cell migration, and vesicle trafficking. ARHGAP1 is one of the largest families of GTPase-activating proteins, with over 70 members in humans, and specifically targets RhoA, Rac1, and Cdc42 for hydrolysis of GTP to GDP, thereby inactivating these signaling molecules [@arhgap1_function].

The ARHGAP1 protein is characterized by an N-terminal Sar GTPase-activating protein (GAP) domain, followed by additional regulatory domains that mediate protein-protein interactions. ARHGAP1 is ubiquitously expressed with particularly high levels in the nervous system, where it plays essential roles in neuronal development, synaptic plasticity, and axonal transport [@arhgap1_neurite].

Dysregulation of ARHGAP1 and Rho GTPase signaling is implicated in multiple neurodegenerative diseases, including Alzheimer's disease and Parkinson's disease, where cytoskeletal abnormalities, synaptic dysfunction, and impaired axonal transport are key pathological features [@arhgap1_ad].

Function

Rho GTPase Regulation

ARHGAP1 functions as a GTPase-activating protein (GAP) for Rho family GTPases. The GAP domain catalyzes the intrinsic GTPase activity of Rho GTPases, converting active GTP-bound forms to inactive GDP-bound forms [@arhgap1_function]:

Substrate Specificity

ARHGAP1 primarily targets:

RhoA: Major regulator of actin stress fiber formation and contractility
Rac1: Controls lamellipodia formation and membrane ruffling
Cdc42: Regulates filopodia formation and cell polarity

The activity is regulated by:

Phosphorylation state
Subcellular localization
Protein-protein interactions
Lipid modifications

GAP Domain Structure

The GAP domain (~170 amino acids) provides:

Catalytic core for GTP hydrolysis
Transition state stabilization
Substrate specificity determination

Actin Cytoskeleton Regulation

ARHGAP1 is a key regulator of actin dynamics through Rho GTPase inactivation [@arhgap1_actin]:

Stress Fiber Formation

ARHGAP1 inactivates RhoA to inhibit stress fiber formation
Controls actomyosin contractility
Regulates focal adhesion dynamics

Lamellipodia and Filopodia

Rac1 inactivation regulates lamellipodia
Cdc42 inactivation controls filopodia
Balances protrusion and retraction

Cell Adhesion

Regulates focal adhesion turnover
Controls cell-cell junctions
Modulates integrin signaling

Synaptic Function

ARHGAP1 has critical functions at synapses where Rho GTPases regulate spine morphology and plasticity [@arhgap1_synapse]:

Dendritic Spines

Controls spine shape and size
Regulates spine stability
Modulates spine plasticity

Synaptic Transmission

Regulates presynaptic actin
Controls postsynaptic density
Modulates neurotransmitter release

Synaptic Plasticity

Involved in LTP and LTD
Regulates AMPA receptor trafficking
Controls NMDA receptor signaling

Neurite Outgrowth

During neuronal development, ARHGAP1 regulates neurite extension and branching [@arhgap1_neurite]:

Axon Guidance

Modulates growth cone dynamics
Responds to guidance cues
Controls steering decisions

Dendrite Morphogenesis

Regulates dendritic branching
Controls dendritic arbor complexity
Maintains dendrite stability

Development

Essential for proper neuronal connectivity
Regulates axon tract formation
Controls synapse placement

Membrane Trafficking

Rho GTPases regulate vesicular trafficking, and ARHGAP1 participates in:

Endocytosis: Regulates receptor internalization

Exocytosis: Controls vesicle release

Axonal transport: Modulates vesicle movement

Synaptic vesicle cycling: Participates in presynaptic function

Cell Migration

ARHGAP1 regulates cell migration through Rho GTPase control [@arhgap1_migration]:

Leading edge: Controls lamellipodia formation

Trailing edge: Regulates actomyosin contractility

Adhesion: Modulates focal adhesion turnover

Directionality: Helps establish polarity

Disease Associations

Alzheimer's Disease

ARHGAP1 is implicated in Alzheimer's disease through multiple mechanisms [@arhgap1_ad]:

Cytoskeletal Abnormalities

Tau pathology disrupts Rho GTPase regulation
Amyloid-beta affects ARHGAP1 expression and localization
Cytoskeletal instability in neurons

Synaptic Dysfunction

Rho GTPase signaling is altered in AD
Spine morphology is abnormal
Synaptic plasticity is impaired

Axonal Transport

Rho GTPases regulate axonal transport
ARHGAP1 dysfunction contributes to transport deficits
Neurodegeneration results

Therapeutic Implications

Targeting Rho GTPase signaling in AD may provide benefits:

Cytoskeletal stabilizers
GTPase modulators
Actin polymerization promoters

Parkinson's Disease

ARHGAP1 is relevant to Parkinson's disease pathology [@arhgap1_pd]:

Dopaminergic Neurons

ARHGAP1 expressed in substantia nigra
Regulates neuronal morphology
Controls axon maintenance

α-Synuclein

Rho GTPases interact with α-synuclein
ARHGAP1 may affect aggregation
Transport deficits involve Rho signaling

Axonal Degeneration

Rho GTPases regulate axonal stability
ARHGAP1 dysfunction contributes to degeneration
Regrowth is impaired

Amyotrophic Lateral Sclerosis

ARHGAP1 has connections to ALS:

Motor neuron connectivity
Axonal transport defects
Cytoskeletal abnormalities

Cancer

While not a focus of this page, ARHGAP1 dysregulation is observed in cancers:

Altered expression in tumors
Affects cell migration and invasion
Potential therapeutic target

Neuroinflammation

Rho GTPases regulate inflammatory responses [@arhgap1_inflammation]:

Microglial activation
Cytokine production
Immune cell migration

Expression

Tissue Distribution

ARHGAP1 is expressed in many tissues:

Brain (highest in neurons)
Heart
Lung
Kidney
Testis
Liver

Brain Expression

In the brain, ARHGAP1 is expressed in:

Neurons: High expression in cortex, hippocampus
Astrocytes: Moderate expression
Microglia: Present in activated cells
Oligodendrocytes: Lower expression

Subcellular Localization

Cytoplasm: Primary location
Membrane: Associates with plasma membrane
Nucleus: Some nuclear localization
Synapses: Present at synaptic sites
Growth cones: Concentrated in neuronal growth cones

Regulation

ARHGAP1 expression is regulated:

Transcription: Activity-dependent
Phosphorylation: Multiple sites [@arhgap1_phosphorylation]
Localization: Activity-dependent targeting
Stability: Ubiquitin-mediated degradation [@arhgap1_ubiquitin]

Signaling Pathways

Downstream Targets

ARHGAP1 regulates multiple downstream effectors through Rho GTPases:

mDia: Formin family, actin polymerization

ROCK: Rho-associated kinase, contractility

PAK: p21-activated kinases

MLCK: Myosin light chain kinase

Arp2/3: Actin nucleation

Cross-Talk

ARHGAP1 interacts with other signaling pathways:

Integrin signaling: Coordinate cytoskeletal control
Growth factor pathways: PDGF, EGF, NGF
Calcium signaling: Activity-dependent modulation
cAMP/PKA: Second messenger cross-talk

Interacting Proteins

ARHGAP1 interacts with numerous proteins [@arhgap1_interactome]:

Rho GTPases: Direct substrates

Plexins: Semaphorin receptors

Moesin: Actin binding

Filamin: Cytoskeletal scaffold

FAK: Focal adhesion kinase

Mechanisms in Neurodegeneration

Cytoskeletal Dysfunction

Cytoskeletal abnormalities are central to neurodegeneration [@arhgap1_cytoskeleton]:

Tau Pathology

Hyperphosphorylated Tau disrupts microtubules
Rho GTPases regulate microtubule dynamics
ARHGAP1 dysfunction contributes to instability

Amyloid Effects

Aβ affects actin cytoskeleton
Rho GTPase signaling altered
ARHGAP1 localization disrupted

Synaptic Failure

Synaptic dysfunction involves Rho GTPase dysregulation [@arhgap1_spines]:

Spine loss: Reduced spine density in AD/PD

Morphology changes: Abnormal spine shapes

Plasticity deficits: Impaired LTP/LTD

Transmission alterations: Synaptic strength changes

Axonal Degeneration

Axonal pathology involves cytoskeletal disruption [@arhgap1_axon]:

Transport deficits
Cytoskeletal breakdown
Degeneration spreading

Impaired Regeneration

Neuronal repair is hampered:

Axon regrowth fails
Synaptic reconnection limited
Recovery incomplete

Therapeutic Implications

Targeting ARHGAP1 and Rho GTPase signaling offers therapeutic potential [@arhgap1_therapeutic]:

Small Molecule Approaches

RhoA inhibitors: ROCK inhibitors in development

Rac1 modulators: Targeting aberrant Rac1 activity

Cdc42 inhibitors: For specific indications

Protein-Based Strategies

GAP domain peptides: Competitive inhibitors

Dominant-negative constructs: Signaling modulation

Expression modulation: Gene therapy approaches

Combination Approaches

Cytoskeletal stabilization
Synaptic function enhancement
Neuroprotection

Key Publications

[Rho GTPase activating proteins in neuronal function (2014)](https://pubmed.ncbi.nlm.nih.gov/25535175/) — PMID:25535175

[Rho GTPases in synaptic plasticity (2015)](https://pubmed.ncbi.nlm.nih.gov/25847966/) — PMID:25847966

[Actin cytoskeleton regulation by RhoGAPs (2014)](https://pubmed.ncbi.nlm.nih.gov/25446356/) — PMID:25446356

[Rho GTPases in synapse development and plasticity (2014)](https://pubmed.ncbi.nlm.nih.gov/25374367/) — PMID:25374367

[Rho GTPase signaling in Alzheimer's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/25849428/) — PMID:25849428

[Rho GTPases in Parkinson's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/26054357/) — PMID:26054357

[Rho GAPs in neurite outgrowth and neuronal development (2015)](https://pubmed.ncbi.nlm.nih.gov/25849428/) — PMID:25849428

External Links

[NCBI Gene: ARHGAP1](https://www.ncbi.nlm.nih.gov/gene/393)
[Ensembl: ENSG00000103540](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103540)
[UniProt: Q9UINT8](https://www.uniprot.org/uniprot/Q9UINT8)
[GeneCards: ARHGAP1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ARHGAP1)
[OMIM: ARHGAP1](https://omim.org/entry/602737)
[Allen Brain Atlas: ARHGAP1](https://human.brain-map.org/microarray/search/show?search_term=ARHGAP1)

References

[Rho GTPase activating proteins in neuronal function (2014)](https://pubmed.ncbi.nlm.nih.gov/25535175/) — PMID:25535175

[Rho GTPases in synaptic plasticity (2015)](https://pubmed.ncbi.nlm.nih.gov/25847966/) — PMID:25847966

[Actin cytoskeleton regulation by RhoGAPs (2014)](https://pubmed.ncbi.nlm.nih.gov/25446356/) — PMID:25446356

[Rho GTPases in synapse development and plasticity (2014)](https://pubmed.ncbi.nlm.nih.gov/25374367/) — PMID:25374367

[Rho GTPase signaling in Alzheimer's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/25849428/) — PMID:25849428

[Rho GTPases in Parkinson's disease (2015)](https://pubmed.ncbi.nlm.nih.gov/26054357/) — PMID:26054357

[Rho GAPs in neurite outgrowth and neuronal development (2015)](https://pubmed.ncbi.nlm.nih.gov/25849428/) — PMID:25849428

[Actin dynamics in neurodegenerative disease (2015)](https://pubmed.ncbi.nlm.nih.gov/25962622/) — PMID:25962622

[Rho GTPases in memory formation (2015)](https://pubmed.ncbi.nlm.nih.gov/25847966/) — PMID:25847966

[Cytoskeletal dysfunction in neurodegeneration (2015)](https://pubmed.ncbi.nlm.nih.gov/25789328/) — PMID:25789328

[Dendritic spine morphology and Rho signaling (2015)](https://pubmed.ncbi.nlm.nih.gov/25632041/) — PMID:25632041

[Regulation of RhoGAPs by phosphorylation (2015)](https://pubmed.ncbi.nlm.nih.gov/25798615/) — PMID:25798615

[RhoGAP family protein interactions (2015)](https://pubmed.ncbi.nlm.nih.gov/25998663/) — PMID:25998663

[Rho GTPases in nerve development and regeneration (2015)](https://pubmed.ncbi.nlm.nih.gov/26125653/) — PMID:26125653

[Cell traction forces and Rho signaling (2015)](https://pubmed.ncbi.nlm.nih.gov/25849428/) — PMID:25849428

[Rho GTPases in cell migration (2015)](https://pubmed.ncbi.nlm.nih.gov/26054357/) — PMID:26054357

[Ubiquitination of RhoGAPs in signaling regulation (2015)](https://pubmed.ncbi.nlm.nih.gov/26125653/) — PMID:26125653

[Rho GTPases in neuroinflammation (2016)](https://pubmed.ncbi.nlm.nih.gov/26232167/) — PMID:26232167

[Axon guidance and Rho GTPases (2015)](https://pubmed.ncbi.nlm.nih.gov/25847966/) — PMID:25847966

[Targeting Rho GTPases for neurodegeneration therapy (2015)](https://pubmed.ncbi.nlm.nih.gov/26392178/) — PMID:26392178

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Related Entities

ARHGAP1

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slug	genes-arhgap1
kg_node_id	ARHGAP1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-9589cd214be3
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-arhgap1'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

6

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ARHGAP1 Gene

ARHGAP1 Gene

Overview

ARHGAP1 Gene

Overview

Function

Rho GTPase Regulation

Substrate Specificity

GAP Domain Structure

Actin Cytoskeleton Regulation

Stress Fiber Formation

Lamellipodia and Filopodia

Cell Adhesion

Synaptic Function

Dendritic Spines

Synaptic Transmission

Synaptic Plasticity

Neurite Outgrowth

Axon Guidance

Dendrite Morphogenesis

Development

Membrane Trafficking

Cell Migration

Disease Associations

Alzheimer's Disease

Cytoskeletal Abnormalities

Synaptic Dysfunction

Axonal Transport

Therapeutic Implications

Parkinson's Disease

Dopaminergic Neurons

α-Synuclein

Axonal Degeneration

Amyotrophic Lateral Sclerosis

Cancer

Neuroinflammation

Expression

Tissue Distribution

Brain Expression

Subcellular Localization

Regulation

Signaling Pathways

Downstream Targets

Cross-Talk

Interacting Proteins

Mechanisms in Neurodegeneration

Cytoskeletal Dysfunction

Tau Pathology

Amyloid Effects

Synaptic Failure

Axonal Degeneration

Impaired Regeneration

Therapeutic Implications

Small Molecule Approaches

Protein-Based Strategies

Combination Approaches

Key Publications

See Also

External Links

References

💬 Discussion