SESN3 — Sestrin 3
Introduction
Sesn3 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.
<div class="infobox infobox-gene"> [@cai2016]
<div class="infobox-header">SESN3</div>
<div class="infobox-content">
Full Name: Sestrin 3<br>
Chromosomal Location: 11q21<br>
NCBI Gene ID: 286826<br>
OMIM: 607336<br>
Ensembl ID: ENSG00000148231<br>
UniProt: Q9Y5P4<br>
Associated Diseases: Alzheimer's Disease, Parkinson's Disease, Metabolic Disease
</div>
</div>
Overview
flowchart TD
SESN3["SESN3"] -->|"expressed in"| Ms["Ms"]
SESN3["SESN3"] -->|"expressed in"| Als["Als"]
SESN3["SESN3"] -->|"expressed in"| ATG7["ATG7"]
SESN3["SESN3"] -->|"expressed in"| CSF1R["CSF1R"]
SESN3["SESN3"] -->|"expressed in"| LGALS1["LGALS1"]
SESN3["SESN3"] -->|"expressed in"| GPNMB["GPNMB"]
SESN3["SESN3"] -->|"expressed in"| GAIN["GAIN"]
SESN3["SESN3"] -->|"expressed in"| LGALS3["LGALS3"]
SESN3["SESN3"] -->|"expressed in"| AND["AND"]
SESN3["SESN3"] -->|"expressed in"| MICROGLIA["MICROGLIA"]
SESN3["SESN3"] -->|"expressed in"| RNA["RNA"]
SESN3["SESN3"] -->|"expressed in"| White_Matter["White Matter"]
LGALS3["LGALS3"] -->|"expressed in"| SESN3["SESN3"]
CD44["CD44"] -->|"expressed in"| SESN3["SESN3"]
style SESN3 fill:#4fc3f7,stroke:#333,color:#000
...SESN3 — Sestrin 3
Introduction
Sesn3 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.
<div class="infobox infobox-gene"> [@cai2016]
<div class="infobox-header">SESN3</div>
<div class="infobox-content">
Full Name: Sestrin 3<br>
Chromosomal Location: 11q21<br>
NCBI Gene ID: 286826<br>
OMIM: 607336<br>
Ensembl ID: ENSG00000148231<br>
UniProt: Q9Y5P4<br>
Associated Diseases: Alzheimer's Disease, Parkinson's Disease, Metabolic Disease
</div>
</div>
Overview
Mermaid diagram (expand to render)
SESN3 (Sestrin 3) is a member of the sestrin family of stress-responsive proteins that regulate cellular metabolism, antioxidant defense, and stress responses. It is induced by various stress conditions and plays important roles in maintaining cellular homeostasis. SESN3 is increasingly studied for its protective roles in neurodegeneration["@budanov2008"].
Function
SESN3 shares functional similarities with other sestrins (SESN1 and SESN2):
mTORC1 Inhibition
SESN3 regulates mTORC1 through the GATOR2 complex:
- GATOR2 senses amino acid availability
- SESN3 binding relieves mTORC1 inhibition
- Important for protein synthesis and autophagy balance
AMPK Activation
SESN3 activates AMPK signaling:
- AMPK senses cellular energy status
- Phosphorylates downstream targets (TSC2, ULK1)
- Promotes catabolism, inhibits anabolism
Antioxidant Defense
SESN3 contributes to NRF2-mediated antioxidant response:
- Promotes NRF2 nuclear translocation
- Leads to transcription of antioxidant genes
- Includes HO-1, NQO1, GCLM
Autophagy Regulation
SESN3 promotes autophagy:
- ULK1 activation by AMPK
- Clearance of damaged proteins and organelles
- Protection against proteotoxic stress
Helps regulate cellular energy homeostasis:
- Responds to oxidative stress
- Links metabolism to stress responses
- Protects against metabolic dysfunction
Expression
SESN3 is expressed in various tissues:
- Brain: [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), cerebellum
- Liver, kidney, muscle
- Inducible by stress conditions (oxidative, metabolic)
Role in Neurodegeneration
Alzheimer's Disease
SESN3 may protect against AD pathogenesis through multiple mechanisms:
- [mTOR](/entities/mtor) regulation: Relevant to [amyloid-beta](/proteins/amyloid-beta) metabolism and [tau](/proteins/tau) phosphorylation[@cai2016]
- Antioxidant properties: Combat oxidative stress in AD brain
- [Autophagy](/entities/autophagy) promotion: May help clear Aβ and tau aggregates
- Synaptic protection: May preserve synaptic function
Parkinson's Disease
Potential neuroprotective effects in PD:
- Dopaminergic neuron protection: May protect substantia nigra [neurons](/entities/neurons)
- Metabolic support: Helps maintain neuronal energy metabolism
- Oxidative stress mitigation: Counteracts [ROS](/entities/reactive-oxygen-species) in dopaminergic cells
- [α-Synuclein](/proteins/alpha-synuclein) clearance: Autophagy promotion may reduce aggregation
Other Neurodegenerative Disorders
- Metabolic diseases: Diabetes-associated cognitive decline
- FTD: Protein homeostasis maintenance
- Huntington's disease: Aggregate clearance
Signaling Pathways
mTORC1 Regulation
SESN3 inhibits mTORC1 signaling through the GATOR2 complex, which senses amino acid availability. This regulation is important for protein synthesis and autophagy balance.
AMPK Activation
SESN3 activates AMPK, which then phosphorylates downstream targets including TSC2 and ULK1, promoting catabolism and inhibiting anabolism.
NRF2 Antioxidant Response
SESN3 promotes NRF2 activation, leading to transcription of antioxidant genes including HO-1, NQO1, and GCLM.
Therapeutic Implications
Targeting SESN3 may offer therapeutic benefits:
[mTOR](/mechanisms/mtor-signaling-pathway) modulators: SESN3 activators could restore mTOR balance in neurodegeneration
Antioxidant therapy: Enhancing NRF2 activation via SESN3
Autophagy enhancers: Promoting clearance of protein aggregates
Metabolic support: Improving neuronal energy metabolismSee Also
- [mTOR Signaling in Neurodegeneration](/mechanisms/mtor-signaling-neurodegeneration)
- [Autophagy in Neurodegeneration](/mechanisms/autophagy-lysosome-neurodegeneration)mechanisms/autophagy-lysosomal-pathway)
- [NRF2 Antioxidant Pathway](/mechanisms/nrf2-antioxidant-pathway)
- [Sestrin Protein Family](/proteins/sestrin-family)
External Links
- [NCBI Gene: SESN3](https://www.ncbi.nlm.nih.gov/gene/286826)
- [UniProt: Q9Y5P4](https://www.uniprot.org/uniprot/Q9Y5P4)
- [Ensembl: ENSG00000148231](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000148231)
Background
The study of Sesn3 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
[Unknown, Budanov AV, Karin M. p53 target genes sestrin1 and sestrin2 connect genotoxic stress and mTOR signaling. Cell. 2008 (2008)](https://pubmed.ncbi.nlm.nih.gov/18451129/)
[Cai Z, et al., Role of mTOR in Alzheimer's disease. Cell Mol Neurobiol. 2016 (2016)](https://pubmed.ncbi.nlm.nih.gov/26485762/)