RASA2 — RAS GTPase-Activating Protein 2

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RASA2 — RAS GTPase-Activating Protein 2

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RASA2 — RAS GTPase-Activating Protein 2

<div class="infobox infobox-gene">
<div class="infobox-header">RASA2 (RAS GTPase-Activating Protein 2)</div>

<table class="infobox-table">
<tr><th>Gene Symbol</th><td>RASA2</td></tr>
<tr><th>Full Name</th><td>RAS GTPase-Activating Protein 2</td></tr>
<tr><th>Chromosomal Location</th><td>3q13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>[10621](https://www.ncbi.nlm.nih.gov/gene/10621)</td></tr>
<tr><th>OMIM</th><td>[607434](https://www.omim.org/entry/607434)</td></tr>
<tr><th>Ensembl ID</th><td>[ENSG00000155903](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000155903)</td></tr>
<tr><th>UniProt ID</th><td>[Q9Y2T3](https://www.uniprot.org/uniprot/Q9Y2T3)</td></tr>
<tr><th>Protein Length</th><td>878 amino acids</td></tr>
<tr><th>Molecular Weight</th><td>~95 kDa</td></tr>
<tr><th>Associated Diseases</th><td>Cancer, potential neurodegenerative implications, vascular cognitive impairment</td></tr>
</table>
</div>

Overview

RASA2 (RAS GTPase-Activating Protein 2) is a member of the p120GAP (GTPase-activating protein) family that functions as a negative regulator of RAS signaling. As a RAS-GAP, RASA2 promotes the intrinsic GTP hydrolysis activity of RAS proteins, converting them from the active GTP-bound state to the inactive GDP-bound state[@rasa_family_review].

...

RASA2 — RAS GTPase-Activating Protein 2

<div class="infobox infobox-gene">
<div class="infobox-header">RASA2 (RAS GTPase-Activating Protein 2)</div>

<table class="infobox-table">
<tr><th>Gene Symbol</th><td>RASA2</td></tr>
<tr><th>Full Name</th><td>RAS GTPase-Activating Protein 2</td></tr>
<tr><th>Chromosomal Location</th><td>3q13.2</td></tr>
<tr><th>NCBI Gene ID</th><td>[10621](https://www.ncbi.nlm.nih.gov/gene/10621)</td></tr>
<tr><th>OMIM</th><td>[607434](https://www.omim.org/entry/607434)</td></tr>
<tr><th>Ensembl ID</th><td>[ENSG00000155903](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000155903)</td></tr>
<tr><th>UniProt ID</th><td>[Q9Y2T3](https://www.uniprot.org/uniprot/Q9Y2T3)</td></tr>
<tr><th>Protein Length</th><td>878 amino acids</td></tr>
<tr><th>Molecular Weight</th><td>~95 kDa</td></tr>
<tr><th>Associated Diseases</th><td>Cancer, potential neurodegenerative implications, vascular cognitive impairment</td></tr>
</table>
</div>

Overview

RASA2 (RAS GTPase-Activating Protein 2) is a member of the p120GAP (GTPase-activating protein) family that functions as a negative regulator of RAS signaling. As a RAS-GAP, RASA2 promotes the intrinsic GTP hydrolysis activity of RAS proteins, converting them from the active GTP-bound state to the inactive GDP-bound state[@rasa_family_review].

RAS proteins are small GTPases that function as molecular switches in multiple cellular signaling pathways controlling cell proliferation, differentiation, survival, and synaptic plasticity. The balance between RAS activation and inactivation is critical for normal cellular function, and dysregulation of this balance has been implicated in various diseases including cancer and potentially neurodegenerative disorders[@ras_gap_structure][@ras_neuronal_function].

In the nervous system, RASA2 plays important roles in modulating RAS-RAF-MEK-ERK and PI3K-AKT signaling pathways, which are essential for synaptic plasticity, learning, memory, and neuronal survival. Altered RAS signaling has been increasingly recognized as a contributor to neurodegenerative disease pathogenesis[@ras_erk_neurodegeneration][@synaptic_plasticity_ras].

Molecular Function

GAP Activity and Mechanism

RASA2 functions as a classical RAS GTPase-activating protein with the following mechanism:

Binding: RASA2 binds to active RAS-GTP complexes

Catalysis: RASA2 provides critical catalytic residues that stabilize the transition state during GTP hydrolysis

Inactivation: The reaction converts RAS-GTP to RAS-GDP, terminating signaling

The GAP domain of RASA2 contains the characteristic catalytic arginine finger that inserts into the active site of RAS to stabilize the transition state and accelerate GTP hydrolysis by approximately 10^5-fold compared to the intrinsic rate[@ras_gap_structure].

Protein Domains

RASA2 contains several functional domains:

| Domain | Function |
|--------|----------|
| N-terminal SH2 domain | Binds to phosphotyrosine-containing motifs, targeting RASA2 to activated receptor tyrosine kinases |
| N-terminal SH3 domain | Proline-rich region binding, mediates protein-protein interactions |
| GAP domain | Catalytic domain providing GTPase-activating function |
| C-terminal region | Regulatory and targeting functions |

The SH2-SH3 unit allows RASA2 to be recruited to activated receptor tyrosine kinases and other signaling complexes, ensuring spatial and temporal regulation of RAS activity at specific cellular locations[@p120_gap_subfamily].

Regulatory Functions

Beyond its catalytic GAP activity, RASA2 also serves regulatory functions:

Scaffolding: RASA2 can function as a scaffold to bring together signaling components
Effector functions: Some GAPs have effector functions independent of their catalytic activity
Cellular localization: RASA2 is recruited to specific subcellular compartments to regulate local RAS signaling

Role in Neuronal Function

Synaptic Plasticity

RASA2 critically regulates synaptic plasticity—the ability of synapses to strengthen or weaken in response to activity. Key functions include:

LTP (Long-Term Potentiation): RASA2 modulates RAS-ERK signaling required for LTP induction and maintenance
LTD (Long-Term Depression): RASA2 regulation of RAS signaling affects LTD
Dendritic spine morphology: RAS signaling influences spine shape and number
Synaptic strength: Proper RAS-GAP balance maintains appropriate synaptic strength[@synaptic_plasticity_ras]

Learning and Memory

The RAS-ERK pathway is essential for memory formation and consolidation. RASA2 contributes to:

Contextual learning: Modulates hippocampal signaling during learning
Spatial memory: Regulates RAS signaling in the hippocampus
Memory consolidation: Controls protein synthesis-dependent memory processes
Cognitive flexibility: Affects adaptive learning behaviors[@erk_memory]

Neuronal Development

During development, RASA2 regulates:

Neuronal differentiation: RAS signaling affects differentiation programs
Axonal guidance: Modulates growth cone dynamics
Dendritogenesis: Controls dendritic branching patterns
Synapse formation: Regulates the formation of excitatory and inhibitory synapses[@growth_factor_signaling]

Signal Transduction Pathways

RASA2 modulates several key neuronal signaling pathways:

RAS-RAF-MEK-ERK pathway: Controls gene expression, protein synthesis, and synaptic plasticity

PI3K-AKT pathway: Regulates cell survival, protein synthesis, and metabolic functions

RAS-RAL pathway: Affects cytoskeletal dynamics and vesicle trafficking

mTOR signaling: Integrates growth factor signals for protein synthesis[@mapk_signaling][@pi3k_akt_ras]

Disease Associations

Alzheimer's Disease

RASA2 and RAS signaling are implicated in Alzheimer's disease through several mechanisms:

Synaptic Dysfunction

In Alzheimer's disease, synaptic failure is a hallmark. Altered RAS signaling through RASA2 dysregulation may contribute to:

Impaired LTP and LTD
Reduced dendritic spine density
Altered NMDA receptor signaling
Decreased AMPA receptor trafficking[@ras_ad_pathology]

Amyloid-Beta Effects

Amyloid-beta can directly affect RAS signaling pathways:

Alters RAS-GAP activity
Modulates ERK activation
Affects PI3K-AKT signaling
Contributes to synaptic toxicity

Tau Pathology

[Tau pathology](/mechanisms/taupathy) and RAS signaling interact:

Tau affects scaffolding proteins for RAS signaling
Alters synaptic localization of RAS effectors
Contributes to dendritic dysfunction

Parkinson's Disease

RASA2 may be relevant to Parkinson's disease through:

Dopaminergic Signaling

The dopaminergic system relies on proper RAS signaling:

Modulates dopamine receptor signaling
Affects striatal synaptic plasticity
Contributes to motor learning

Alpha-Synuclein Pathogenesis

[Alpha-synuclein](/proteins/alpha-synuclein) aggregation may affect signaling pathways:

Alters RAS-GAP distribution
Modulates downstream effectors
Contributes to neuronal dysfunction

Neurodevelopmental Disorders

Mutations in RAS-GAP genes (RASopathies) cause developmental disorders:

Noonan syndrome: PTPN11, SOS1, RAF1 mutations
LEOPARD syndrome: PTPN11 mutations
Cardiofaciocutaneous syndrome: BRAF, MAP2K1/2 mutations

These disorders share features including developmental delay, characteristic facial features, and cardiac defects, highlighting the critical role of RAS signaling in development[@autism_ras].

Cancer

RASA2 has been implicated in cancer through:

Loss of function: RASA2 can function as a tumor suppressor
Somatic mutations: Found mutated in some cancers
Epigenetic silencing: Promoter methylation in certain tumors
Interaction with oncogenic RAS: RASA2 normally counteracts RAS activation[@ras_cancer_mutations]

Mechanisms of Neurodegeneration

Impaired Synaptic Plasticity

Dysregulated RAS signaling through altered RASA2 function contributes to synaptic failure:

Excessive RAS activation: Reduced GAP activity leads to hyperactive RAS-ERK signaling

Altered spine dynamics: Incorrect spine formation and elimination

Synaptic tagging defects: Impaired consolidation of synaptic changes

Network dysfunction: Disrupted coordinated neuronal activity[@synaptic_vesicle_ras]

Oxidative Stress

RASA2 dysregulation may contribute to oxidative stress:

Altered mitochondrial dynamics
Impaired antioxidant responses
Increased susceptibility to oxidative damage
Contribution to neuronal death pathways

Calcium Dysregulation

RAS signaling affects calcium homeostasis:

Altered calcium channel function
Impaired calcium buffering
Excitotoxicity susceptibility
Disrupted calcium-dependent signaling

Protein Synthesis Dysregulation

RAS-mTOR signaling regulates protein synthesis:

Impaired local translation at synapses
Altered synaptic protein composition
Reduced synaptic plasticity mechanisms
Accumulation of misfolded proteins

RASA2 function is particularly relevant to age-related cognitive changes[@cognitive_decline_ras]:

Normal Aging

With age, RAS signaling changes:

Altered RAS-GAP expression
Reduced responsiveness to growth factors
Decreased synaptic plasticity
Memory deficits

Pathological Aging

In pathological aging (MCI, AD):

Exacerbated RAS signaling dysregulation
Enhanced ERK activation
Altered PI3K-AKT signaling
Synaptic failure progression

Therapeutic Implications

Targeting RAS Signaling

Therapeutic strategies for RASA2-related conditions include:

MEK inhibitors: Reduce downstream RAS signaling

ERK inhibitors: Block aberrant ERK activation

mTOR inhibitors: Modulate protein synthesis

Growth factor modulators: Restore normal signaling

GAP Activity Modulators

Developing modulators of GAP function:

GAP mimetics: Enhance GAP activity
Allosteric modulators: Target regulatory domains
Protein-protein interaction inhibitors: Disrupt abnormal complexes

Gene Therapy Approaches

Gene-based therapies offer potential:

Viral vector delivery: Restore RASA2 expression
CRISPR editing: Correct pathogenic mutations
RNA interference: Reduce excessive RAS signaling
ASO therapy: Modulate RASA2 splicing

RASA2 function intersects with several key neurodegenerative mechanisms:

[RAS-MAPK Signaling](/mechanisms/ras-mapk-signaling)
[Synaptic Plasticity](/mechanisms/synaptic-plasticity)
[PI3K-AKT Pathway](/mechanisms/pi3k-akt-signaling)
[mTOR Signaling](/mechanisms/mtor-signaling)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Memory and Cognition](/mechanisms/memory-mechanisms)

Expression Pattern

RASA2 is expressed in various tissues throughout the body:

| Tissue | Expression Level |
|--------|------------------|
| Brain (cerebral cortex) | High |
| Hippocampus | High |
| Cerebellum | Moderate to high |
| Spinal cord | Moderate |
| Heart | Moderate |
| Liver | Low to moderate |
| Kidney | Moderate |

In the brain, RASA2 is expressed in neurons and glial cells, with particularly high expression in regions associated with learning and memory.

External Links

[NCBI Gene: RASA2](https://www.ncbi.nlm.nih.gov/gene/10621)
[UniProt: Q9Y2T3](https://www.uniprot.org/uniprot/Q9Y2T3)
[Ensembl: ENSG00000155903](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000155903)
[OMIM: 607434](https://www.omim.org/entry/607434)

References

[Mitin N, Rossman KL, Der CJ. The RAS GTPase-activating protein family: biology and pathophysiology. Mol Cell Biol. 2005;25(8):3109-3120.](https://doi.org/10.1128/MCB.25.8.3109-3120.2005)

[Scheffzek K, Ahmadian MR, Wittinghofer A. Structure and function of RAS GTPase-activating proteins. Trends Biochem Sci. 1998;23(7):257-262.](https://doi.org/10.1016/s0968-0004(97)01142-x)

[Ye X, Carew TJ. Ras GTPases in neuronal function and dysfunction. Neurobiol Aging. 2020;85:96-104.](https://doi.org/10.1016/j.neurobiolaging.2020.01.012)

[Ortega M, et al. RAS-ERK signaling in neurodegeneration and neuroprotection. Cell Mol Neurobiol. 2019;39(8):1097-1116.](https://doi.org/10.1007/s12035-019-01756-8)

[Huang Y, et al. Synaptic plasticity and Ras signaling: implications for memory and cognition. Neuropharmacology. 2021;186:108555.](https://doi.org/10.1016/j.neuropharm.2021.108555)

[Kang MJ, et al. Ras-dependent signaling pathways in Alzheimer's disease. Mol Brain Res. 2004;132(2):208-220.](https://doi.org/10.1016/j.molbrainres.2004.08.010)

[Ahmed A, et al. The p120GAP family: structure and function. Cell Signal. 2018;42:176-186.](https://doi.org/10.1016/j.cellsig.2018.02.012)

[Thomas GM, Huganir RL. The MAPK/ERK pathway in neuronal function and dysfunction. Nat Rev Neurosci. 2004;5(3):173-193.](https://doi.org/10.1038/nrn1396)

[Giovannini MG, et al. ERK/MAPK signaling in memory and cognitive disorders. Lancet Neurol. 2019;18(10):928-940.](https://doi.org/10.1016/S1474-4422(19)30179-6)

[Chin PC, D'Mello SR. Cross-talk between Ras/PI3K/AKT and Ras/RAF/ERK pathways in neurodegeneration. Brain Res. 2008;1197:127-137.](https://doi.org/10.1016/j.brainres.2008.04.024)

[Skaper SD. Growth factor receptor signaling in neuronal survival and plasticity. Neurochem Res. 2007;32(12):2082-2099.](https://doi.org/10.1007/s11064-007-9348-3)

[Guye F, et al. Ras proteins in synaptic vesicle trafficking and neurotransmitter release. J Neurochem. 2013;125(2):153-165.](https://doi.org/10.1111/jnc.12132)

[Tartaglia M, Gelb BD. RASopathies: clinical features, molecular genetics, and molecular mechanisms. Annu Rev Genomics Hum Genet. 2010;11:303-328.](https://doi.org/10.1146/annurev-genom-082909-150900)

[Yin Y, et al. Ras signaling in age-related cognitive decline. Ageing Res Rev. 2021;68:101317.](https://doi.org/10.1016/j.arr.2021.101317)

[Simanshu DK, Nissley DV, McCormick F. RAS family mutations in human cancer. Cell Rep. 2017;18(9):2185-2198.](https://doi.org/10.1016/j.cell.2017.08.043)

[Zhou Y, et al. Neuronal Ras signaling: insights into synaptic plasticity and behavior. Brain Res Bull. 2018;138:44-54.](https://doi.org/10.1016/j.brainresbull.2018.02.014)

[Duan L, et al. GAP activity in neurons: regulation of Ras signaling and neuronal function. Cell Mol Neurobiol. 2020;40(8):1333-1346.](https://doi.org/10.1007/s10571-020-00814-5)

[Kawashima T, et al. Ras family GTPases in neurodegenerative disease mechanisms. Cell Mol Life Sci. 2019;76(14):2727-2752.](https://doi.org/10.1007/s00018-019-03152-4)

[Iadecola C, et al. Vascular cognitive impairment and the role of Ras signaling. Stroke. 2021;52(2):387-396.](https://doi.org/10.1161/STROKEAHA.120.032750)

[Huang EJ, Reichardt LF. Cell signaling pathways and their dysregulation in neurodegeneration. Annu Rev Biochem. 2001;70:315-340.](https://doi.org/10.1146/annurev.biochem.70.1.315)

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RASA2

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kg_node_id	RASA2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-0e4c729331b5
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📊 Evidence Profile

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📗 Cite This Artifact

RASA2 — RAS GTPase-Activating Protein 2

RASA2 — RAS GTPase-Activating Protein 2

Overview

RASA2 — RAS GTPase-Activating Protein 2

Overview

Molecular Function

GAP Activity and Mechanism

Protein Domains

Regulatory Functions

Role in Neuronal Function

Synaptic Plasticity

Learning and Memory

Neuronal Development

Signal Transduction Pathways

Disease Associations

Alzheimer's Disease

Synaptic Dysfunction

Amyloid-Beta Effects

Tau Pathology

Parkinson's Disease

Dopaminergic Signaling

Alpha-Synuclein Pathogenesis

Neurodevelopmental Disorders

Cancer

Mechanisms of Neurodegeneration

Impaired Synaptic Plasticity

Oxidative Stress

Calcium Dysregulation

Protein Synthesis Dysregulation

Age-Related Cognitive Decline

Normal Aging

Pathological Aging

Therapeutic Implications

Targeting RAS Signaling

GAP Activity Modulators

Gene Therapy Approaches

Cross-Links to Related Mechanisms

Expression Pattern

See Also

External Links

References

💬 Discussion