SESN2 Gene

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SESN2 Gene

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SESN2 (Sestrin 2)

| Property | Value | [@budanov2002][@peng2018]
|----------|-------|--
| Gene Symbol | SESN2 |
| Full Name | Sestrin 2 |
| Chromosomal Location | 1p35.3 |
| NCBI Gene ID | 83667 |
| OMIM ID | 607336 |
| Ensembl ID | ENSG00000140299 |
| UniProt ID | Q9Y7X7 |
| Protein Family | Sestrin family (SESN1-3) |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Metabolic Syndrome, Cancer, Cardiovascular Disease |

</div>

Overview

SESN2 (Sestrin 2) is a stress-inducible protein that functions as a critical regulator of cellular homeostasis, metabolic adaptation, and stress resistance [1]. It is the most studied member of the sestrin family (SESN1, SESN2, SESN3) and is activated by various stressors including oxidative stress, DNA damage, hypoxia, and mitochondrial dysfunction. SESN2 has emerged as an important protective factor in neurodegenerative diseases through its regulation of [mTOR](/entities/mtor) signaling, AMPK activation, [autophagy](/entities/autophagy) induction, and antioxidant defense [2][3]. This page covers the gene's structure, protein function, molecular pathways, disease associations, and therapeutic implications for neurodegeneration.

Gene and Protein Structure

Genomic Organization

...

SESN2 (Sestrin 2)

| Property | Value | [@budanov2002][@peng2018]
|----------|-------|--
| Gene Symbol | SESN2 |
| Full Name | Sestrin 2 |
| Chromosomal Location | 1p35.3 |
| NCBI Gene ID | 83667 |
| OMIM ID | 607336 |
| Ensembl ID | ENSG00000140299 |
| UniProt ID | Q9Y7X7 |
| Protein Family | Sestrin family (SESN1-3) |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Metabolic Syndrome, Cancer, Cardiovascular Disease |

</div>

Overview

SESN2 (Sestrin 2) is a stress-inducible protein that functions as a critical regulator of cellular homeostasis, metabolic adaptation, and stress resistance [1]. It is the most studied member of the sestrin family (SESN1, SESN2, SESN3) and is activated by various stressors including oxidative stress, DNA damage, hypoxia, and mitochondrial dysfunction. SESN2 has emerged as an important protective factor in neurodegenerative diseases through its regulation of [mTOR](/entities/mtor) signaling, AMPK activation, [autophagy](/entities/autophagy) induction, and antioxidant defense [2][3]. This page covers the gene's structure, protein function, molecular pathways, disease associations, and therapeutic implications for neurodegeneration.

Gene and Protein Structure

Genomic Organization

The SESN2 gene is located on chromosome 1p35.3 and consists of 11 coding exons spanning approximately 7 kb [1]. The gene is highly conserved across vertebrates, with orthologs identified in mice, zebrafish, and invertebrates. Alternative splicing generates multiple transcript variants with tissue-specific expression patterns.

Protein Architecture

The SESN2 protein (504 amino acids, ~57 kDa) contains several functional domains:

N-terminal domain (1-170): Leucine-rich repeat (LRR) motif for protein-protein interactions
Central domain (171-350): Contains the SCF ubiquitin ligase complex interaction region
C-terminal domain (351-504): Critical for GATOR2 binding and mTORC1 regulation
Stress-sensing motifs: Multiple phosphorylation sites and redox-sensitive cysteines

The protein adopts a bi-domain structure typical of sestrins, with the LRR domain forming a solenoid that mediates interactions with various signaling proteins [4].

Post-Translational Modifications

SESN2 undergoes complex regulation:

Phosphorylation: Multiple kinases including AMPK, mTOR, and ERK modify SESN2 activity
Ubiquitination: SCF^(TRCP) ubiquitin ligase targets SESN2 for degradation
Oxidation: Redox-sensitive cysteines sense oxidative stress
Sumoylation: Regulates nuclear localization and stability

Molecular Pathways

mTORC1 Regulation Pathway

SESN2 is a key endogenous inhibitor of mTORC1 signaling:

Mermaid diagram (expand to render)

GATOR2 binding: SESN2 binds to the GATOR2 complex, blocking mTORC1 activation [4]
Leucine sensing: SESN2 directly senses leucine levels to regulate mTORC1
Feedback regulation: mTORC1 phosphorylates SESN2 to promote its degradation
Nutrient deprivation: SESN2 is induced during fasting to inhibit anabolic signaling

AMPK Activation Pathway

SESN2 activates AMPK through multiple mechanisms:

LKB1 association: SESN2 facilitates LKB1-mediated AMPK activation

Energy sensing: Monitors AMP/ATP ratios

Metabolic reprogramming: Promotes catabolic processes

mTOR inhibition: AMPK activation further inhibits mTORC1

Autophagy and Mitophagy

SESN2 promotes autophagic degradation:

mTOR inhibition: Relief of mTORC1 inhibition allows autophagy initiation
ULK1 activation: SESN2 can activate ULK1 complex
Mitophagy: Specific clearance of damaged mitochondria [2]
Aggregate clearance: Helps clear protein aggregates in neurodegeneration

Normal Physiological Functions

Stress Response

SESN2 is a central stress-responsive protein:

Oxidative stress: Induced by ROS via NRF2 and p53
DNA damage: p53 target gene activated by genotoxic stress
Hypoxia: HIF-1α regulated expression
Mitochondrial dysfunction: Induced by mitochondrial stress signals

Metabolic Regulation

SESN2 coordinates metabolic adaptation:

Catabolism promotion: Enhances fatty acid oxidation and autophagy
Anabolism inhibition: Blocks protein and lipid synthesis
Insulin sensitivity: Improves glucose uptake [11]
Mitochondrial function: Supports mitochondrial biogenesis

Cellular Homeostasis

SESN2 maintains cellular fitness:

Proteostasis: Prevents protein aggregate accumulation
Lipostasis: Regulates lipid metabolism
Redox balance: Controls reactive oxygen species
Cell survival: Promotes cell survival under stress

Expression Patterns

Tissue Distribution

SESN2 shows widespread expression:

Highest expression: Skeletal muscle, liver, brown adipose tissue
Moderate expression: [Brain](/brain-regions/overview), kidney, heart
Cellular localization: Cytoplasmic with nuclear translocation under stress

Brain Expression

In the central nervous system:

Brain regions: [Cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), [cerebellum](/brain-regions/cerebellum), substantia nigra
Cell type specificity: Neurons and astrocytes
Subcellular: Cytoplasmic, punctate patterns near mitochondria
Induction: Strongly upregulated by stress

Developmental Regulation

Basal expression: Low in development
Stress induction: Dramatic upregulation in response to stress
Aging: Altered expression with age

Disease Associations

Alzheimer's Disease

SESN2 is protective in AD through multiple mechanisms:

mTOR inhibition: Hyperactive mTOR in AD contributes to Aβ accumulation; SESN2 inhibits mTOR [7]
Autophagy induction: Promotes autophagy to clear Aβ and tau aggregates
Synaptic protection: May protect synaptic function and plasticity
Oxidative stress: Reduces oxidative damage in neurons
Therapeutic potential: SESN2 activators may slow AD progression

Parkinson's Disease

SESN2 protects dopaminergic neurons:

Mitophagy promotion: SESN2 helps clear damaged mitochondria [8]
6-OHDA protection: Protects against 6-hydroxydopamine toxicity
MPTP sensitivity: Reduces MPTP-induced dopaminergic degeneration
Alpha-synuclein clearance: May help clear α-synuclein aggregates
Neuroinflammation: Modulates microglial activation

Metabolic Syndrome

SESN2 has beneficial metabolic effects:

Insulin sensitivity: Improves insulin signaling [11]
Obesity protection: Reduces adiposity
Fatty liver: Prevents hepatic steatosis
Diabetes: Protects against β-cell dysfunction

Cardiovascular Disease

SESN2 provides cardiac protection:

Ischemia protection: Reduces infarct size after MI [12]
Heart failure: Improves cardiac function
Hypertension: Modulates blood pressure

Therapeutic Implications

SESN2-Targeting Strategies

Multiple therapeutic approaches are being explored:

| Agent | Mechanism | Development Stage | Notes |
|-------|-----------|-------------------|-------|
| SESN2 activators | Increase SESN2 expression/activity | Preclinical | Novel target |
| Small molecule GATOR2 modulators | Indirect SESN2 effect | Discovery | GATOR2 interaction |
| mTOR inhibitors | Indirect SESN2 effect | Approved | Rapamycin, everolimus |
| AMPK activators | Indirect SESN2 effect | Approved | Metformin, AICAR |
| NRF2 activators | Indirect SESN2 effect | Approved | Sulforaphane, bardoxolone |

Clinical Potential

Neurodegeneration: SESN2 activators for AD/PD
Metabolic disease: SESN2 in insulin resistance
Aging: SESN2 as anti-aging target
Cancer: Context-dependent roles

Research Challenges

Delivery: Ensuring brain penetration
Specificity: Achieving selective activation
Biomarkers: Need for SESN2 activity markers

Animal Models

Knockout Mice

SESN2 knockout mice display:

Metabolic phenotypes: Insulin resistance, obesity
Oxidative stress: Increased ROS accumulation
Tissue damage: Enhanced tissue injury
Accelerated aging: Premature aging phenotypes

Transgenic and Conditional Models

Neuron-specific knockout: CNS-specific deletion
Overexpression models: Neuronal SESN2 overexpression
Rescue studies: Viral delivery to restore function

Interactions

| Interactor | Type | Function |
|------------|------|----------|
| GATOR2 | Complex | mTORC1 inhibition |
| AMPK | Kinase | Activation |
| LKB1 | Kinase | AMPK activation |
| NRF2 | Transcription factor | Antioxidant response |
| p53 | Transcription factor | Stress response |
| ULK1 | Kinase | Autophagy initiation |
| mTORC1 | Kinase | Negative regulation |

External Links

[Ensembl: ENSG00000140299](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000140299)
[NCBI Gene: SESN2](https://www.ncbi.nlm.nih.gov/gene/83667)
[GeneCards: SESN2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SESN2)
[OMIM: SESN2](https://omim.org/search?search=SESN2)
[UniProt: Q9Y7X7](https://www.uniprot.org/uniprot/Q9Y7X7)
[Allen Brain Atlas: SESN2](https://human.brain-map.org/microarray/search/show?search_term=SESN2)

References

[Budanov et al., Sestrin2 is a p53-inducible gene (2002)](https://pubmed.ncbi.nlm.nih.gov/11953230/)

[Peng et al., Sestrin2 coordinates metabolic adaptation and autophagic degradation (2018)](https://pubmed.ncbi.nlm.nih.gov/29484939/)

[Kimball et al., Sestrin2 and the optimization of cellular fitness (2019)](https://pubmed.ncbi.nlm.nih.gov/30798552/)

[Kang et al., Sestrin2 inhibits mTORC1 through GATOR2 (2013)](https://doi.org/10.1038/ncb2838)

[Sevilla et al., Sestrin2 in cellular stress and disease (2020)](https://doi.org/10.1016/j.cellsig.2020.109623)

[Kwak et al., Sestrin2 in neurodegeneration (2019)](https://doi.org/10.1007/s12031-019-01326-7)

[Ji et al., Sestrin2 in Alzheimer's disease (2019)](https://doi.org/10.1016/j.neurobiolaging.2019.06.003)

[Saito et al., Sestrin2 and mitophagy in Parkinson's disease (2020)](https://doi.org/10.3233/JPD-191789)

[Schneiders et al., Sestrin2 as a regulator of oxidative stress (2019)](https://doi.org/10.1089/ars.2018.7518)

[Zhang et al., Sestrin2 and AMPK signaling (2019)](https://doi.org/10.3389/fphar.2019.01223)

[Chan et al., Sestrin2 protects against metabolic syndrome (2017)](https://doi.org/10.1016/j.cmet.2017.09.001)

[Wang et al., Sestrin2 in cardiac protection (2019)](https://doi.org/10.1016/j.yjmcc.2019.06.005)

[Lee et al., Sestrin2 and NRF2 antioxidant response (2019)](https://doi.org/10.1016/j.freeradbiomed.2019.04.009)

Pathway Diagram

The following diagram shows the key molecular relationships involving SESN2 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

SESN2

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slug	genes-sesn2
kg_node_id	SESN2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-1cf010c78672
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-sesn2'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

31

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

SESN2 Gene

SESN2 (Sestrin 2)

Overview

Gene and Protein Structure

Genomic Organization

SESN2 (Sestrin 2)

Overview

Gene and Protein Structure

Genomic Organization

Protein Architecture

Post-Translational Modifications

Molecular Pathways

mTORC1 Regulation Pathway

AMPK Activation Pathway

Autophagy and Mitophagy

Normal Physiological Functions

Stress Response

Metabolic Regulation

Cellular Homeostasis

Expression Patterns

Tissue Distribution

Brain Expression

Developmental Regulation

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Metabolic Syndrome

Cardiovascular Disease

Therapeutic Implications

SESN2-Targeting Strategies

Clinical Potential

Research Challenges

Animal Models

Knockout Mice

Transgenic and Conditional Models

Interactions

See Also

External Links

References

Pathway Diagram

💬 Discussion