ATG2A

ATG2A Gene — Autophagy Related 2A

Introduction

```mermaid
flowchart TD
classDef gene fill:#0a1f0a,stroke:#4caf50
classDef protein fill:#0a1929,stroke:#2196f3
classDef disease fill:#2d0f0f,stroke:#e91e63
classDef pathway fill:#3e2200,stroke:#ff9800
classDef mechanism fill:#1a0a1f,stroke:#9c27b0
classDef therapeutic fill:#e0f2f1,stroke:#009688
ATG2A["ATG2A"] -->|"implicated_in"| neurodegeneration["neurodegeneration"]
ATG2A["ATG2A"] -->|"regulates"| phosphatidylethanolamine["phosphatidylethanolamine"]
ATG2A["ATG2A"] -->|"participates_in"| autophagosome_lysosome_fusion["autophagosome-lysosome fusion"]
ATG2A["ATG2A"] ==>|"activates"| Ms["Ms"]
ATG2A["ATG2A"] ==>|"activates"| Neurodegeneration["Neurodegeneration"]
ATG2A["ATG2A"] ==>|"activates"| Ferroptosis["Ferroptosis"]
ATG2A["ATG2A"] ==>|"activates"| Autophagy["Autophagy"]
ATG2A["ATG2A"] ==>|"activates"| WIPI4["WIPI4"]
ATG2A["ATG2A"] -->|"causes"| WDR45["WDR45"]
ATG2A["ATG2A"] -->|"causes"| Neurodegeneration["Neurodegeneration"]
ATG2A["ATG2A"] -->|"causes"| Ferroptosis["Ferroptosis"]
ATG2A["ATG2A"] -->|"causes"| Autophagy["Autophagy"]
ATG2A["ATG2A"] ==>|"activates"| MITOCHONDRIA["MITOCHONDRIA"]
ATG2A["ATG2A"] -->|"causes"| AND["AND"]
ATG2A["ATG2A"] -->|"causes"| FERROPTOSIS["FERROPTOSIS"]
ATG2A["ATG2A"] -->|"causes"| AUTOPHAGY["AUTOPHAGY"]
ATG2A["ATG2A"] -->|"causes"| NEURODEGENERATION["NEURODEGENERATION"]
ATG2A["ATG2A"] -->|"causes"| Raf["Raf"]
ATG2A["ATG2A"] -->|"mediates"| Phosphatidylserine["Phosphatidylserine"]
E2F4

ATG2A Gene — Autophagy Related 2A

Introduction

Atg2A 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"> [@bozic2020]
<table> [@tang2021]
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">ATG2A</th></tr> [@jiang2022]
<tr><td><strong>Gene Symbol</strong></td><td>ATG2A</td></tr> [@osuna2022]
<tr><td><strong>Full Name</strong></td><td>Autophagy Related 2A</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>11q13.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[23130](https://www.ncbi.nlm.nih.gov/gene/23130)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q9BSB5](https://www.uniprot.org/uniprot/Q9BSB5)</td></tr>
<tr><td><strong>Protein Type</strong></td><td>Peripheral Membrane Protein</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~206 kDa</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/neurodegeneration" style="color:#ef9a9a">Neurodegeneration</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">24 edges</a></td>
</tr>
</table>
</div>

Overview

ATG2A is a crucial [autophagy](/entities/autophagy) protein involved in autophagosome formation and lipid metabolism. It functions as a tether that connects the expanding autophagosome membrane to the ER and facilitates the transfer of lipids from donor membranes. ATG2A is essential for bulk autophagy and selective degradation of protein aggregates and damaged organelles.

Function and Mechanism

Autophagosome Expansion

ATG2A operates at the interface between the autophagosome and the endoplasmic reticulum:

• Membrane tethering: ATG2A bridges the growing autophagosome (phagophore) with ER-derived membranes
• Lipid transfer: ATG2A functions as a lipid transfer protein (LTP), mediating phospholipid delivery from ER to autophagosomal membranes
• WIPI proteins: ATG2A interacts with WIPI1/2/3/4 (WD repeat domain phosphoinositide-interacting proteins) to localize to the autophagosomal membrane

The ATG2A-WIPI4 Complex

Recent structural studies have revealed the molecular mechanism:

Selective Autophagy

ATG2A participates in multiple selective autophagy pathways:

• Aggrephagy: Clearance of ubiquitin-positive protein aggregates
• Mitophagy: Degradation of damaged mitochondria
• Xenophagy: Elimination of intracellular pathogens
• Ribophagy: Selective degradation of ribosomes

Role in Neurodegenerative Diseases

Alzheimer's Disease

• Amyloid metabolism: ATG2A-mediated autophagy contributes to [Aβ](/proteins/amyloid-beta) clearance; dysfunction may lead to Aβ accumulation
• [Tau](/proteins/tau) clearance: ATG2A is involved in the autophagic degradation of phosphorylated tau
• ER stress: ATG2A dysfunction exacerbates ER stress in AD [neurons](/entities/neurons)
• Lipid metabolism: Altered lipid homeostasis in AD brains involves ATG2A dysregulation

Parkinson's Disease

• Mitophagy impairment: ATG2A deficiency leads to accumulation of dysfunctional mitochondria
• [Alpha-synuclein](/proteins/alpha-synuclein): ATG2A-mediated autophagy is crucial for clearing α-synuclein aggregates
• [LRRK2](/entities/lrrk2) connection: LRRK2 mutations affect ATG2A-dependent autophagic flux
• Dopaminergic vulnerability: ATG2A may be particularly important in dopaminergic neuron survival

Amyotrophic Lateral Sclerosis

• [TDP-43](/mechanisms/tdp-43-proteinopathy) pathology: ATG2A-mediated selective autophagy is impaired in TDP-43 ALS
• Protein aggregate clearance: Loss of ATG2A function leads to accumulation of toxic protein aggregates
• Axonal transport: ATG2A deficiency affects autophagosome transport in motor neurons

Other Neurodegenerative Conditions

• Huntington's Disease: ATG2A activity helps clear mutant [huntingtin](/proteins/huntingtin) aggregates
• Frontotemporal Dementia: ATG2A dysfunction contributes to protein aggregation
• Lysosomal Storage Disorders: ATG2A compensates for lysosomal dysfunction in certain contexts

Therapeutic Implications

Targeting ATG2A represents a promising therapeutic strategy:

| Approach | Mechanism | Status |
|----------|-----------|--------|
| ATG2A overexpression | Enhance autophagy flux to clear aggregates | Preclinical |
| Small molecule activators | Promote ATG2A recruitment to autophagosomes | Research |
| Gene therapy | Viral delivery of ATG2A to neurons | Preclinical |
| Combination therapy | ATG2A activation with [mTOR](/mechanisms/mtor-signaling-pathway) inhibitors | Research |

Interactions

• Core complex: WIPI4 (WDR45), WIPI3 (WDR45B), ATG2B
• PI3K complex: Beclin-1, PIK3C3/VPS34
• Autophagy machinery: LC3, GABARAP, ATG5-ATG12
• ER proteins: VAP proteins (ER membrane contact sites)

Background

The study of Atg2A 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.

Cross-References

• [ATG2A Protein](/proteins/atg2a-protein)
• [Autophagy in Neurodegeneration](/mechanisms/autophagy-lysosome-neurodegeneration)mechanisms/autophagy-lysosomal-pathway)
• [WIPI Proteins in Autophagy](/mechanisms/wipi-autophagy)
• [ER-Mitochondria Contact Sites](/mechanisms/er-mitochondria-contact-sites)

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/) - Gene database
• [UniProt](https://www.uniprot.org/) - Protein database

References

Pathway Diagram

The following diagram shows the key molecular relationships involving ATG2A discovered through SciDEX knowledge graph analysis: