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ATG9A Gene
ATG9A
<div class="infobox infobox-gene">
| | |
|---|---|
| Gene Symbol | ATG9A |
| Full Name | Autophagy Related 9A |
| Chromosomal Location | 2p24.1 |
| NCBI Gene ID | [57465](https://www.ncbi.nlm.nih.gov/gene/57465) |
| OMIM | [614453](https://omim.org/entry/614453) |
| Ensembl ID | ENSG00000138792 |
| UniProt ID | [Q7Z418](https://www.uniprot.org/uniprot/Q7Z418) |
| Associated Diseases | [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), [Huntington's Disease](/diseases/huntingtons) |
| Protein | [ATG9A Protein](/proteins/atg9a-protein) |
</div>
ATG9A — Autophagy Related 9A
Introduction
Atg9A 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.
Overview
...ATG9A
<div class="infobox infobox-gene">
| | |
|---|---|
| Gene Symbol | ATG9A |
| Full Name | Autophagy Related 9A |
| Chromosomal Location | 2p24.1 |
| NCBI Gene ID | [57465](https://www.ncbi.nlm.nih.gov/gene/57465) |
| OMIM | [614453](https://omim.org/entry/614453) |
| Ensembl ID | ENSG00000138792 |
| UniProt ID | [Q7Z418](https://www.uniprot.org/uniprot/Q7Z418) |
| Associated Diseases | [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), [Huntington's Disease](/diseases/huntingtons) |
| Protein | [ATG9A Protein](/proteins/atg9a-protein) |
</div>
ATG9A — Autophagy Related 9A
Introduction
Atg9A 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.
Overview
ATG9A (Autophagy Related 9A) encodes the only transmembrane protein in the core autophagy machinery, making it uniquely essential for autophagosome biogenesis [1]. Located on chromosome 2p24.1, ATG9A is a 790-amino acid multi-pass membrane protein that cycles between the trans-Golgi network, endosomes, and plasma membrane, serving as a critical membrane source for phagophore expansion [2]. Unlike other ATG proteins that are recruited to forming autophagosomes, ATG9A is constitutively present and provides the lipid bilayer necessary for autophagosome expansion and closure [3]. Dysfunction of ATG9A-mediated autophagy is implicated in neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease-disease), Huntington's disease, and amyotrophic lateral sclerosis [4][5].
Molecular Function
Membrane Trafficking
ATG9A performs unique functions as the only transmembrane ATG protein:
Cycling Between Compartments
ATG9A undergoes continuous cycling:
- Trans-Golgi network (TGN): Primary reservoir for ATG9A under basal conditions [10]
- Endosomes: ATG9A-positive endosomes deliver membrane to autophagosomes [11]
- Plasma membrane: Constitutive endocytosis and recycling [12]
- Autophagosome: Transient association during biogenesis [13]
Interaction Network
| Partner | Function |
|---------|----------|
| ATG2A/B | Lipid transfer from ER to ATG9A |
| WIPI1/2/3/4 | Membrane recruitment to phagophore |
| ULK1/2 | Phosphorylation and activation |
| ATG14L | Selective autophagy regulation |
| p62/SQSTM1 | Selective cargo recognition |
Expression and Regulation
Brain Expression
ATG9A is expressed in all neuronal cell types:
- [Neurons](/entities/neurons): High expression in cerebral [cortex](/brain-regions/cortex) pyramidal neurons, hippocampal granule cells, and cerebellar Purkinje cells
- [Astrocytes](/entities/astrocytes): Constitutive expression for protein quality control
- [Microglia](/entities/microglia): Inducible expression during activation
- Oligodendrocytes: Myelin maintenance functions
Regulation Mechanisms
- Phosphorylation: ULK1 phosphorylates ATG9A on multiple serine residues to activate membrane trafficking [14]
- Ubiquitination: K63-linked ubiquitination regulates ATG9A stability and interactions [15]
- O-GlcNAcylation: Glucose metabolism affects ATG9A function through this modification [16]
Role in Neurodegenerative Diseases
Alzheimer's Disease
ATG9A dysfunction contributes to AD pathogenesis through multiple mechanisms [17]:
- Amyloid-beta clearance: ATG9A-dependent autophagy is required for efficient [Aβ](/proteins/amyloid-beta) degradation; impairment leads to plaque accumulation [18]
- [Tau](/proteins/tau) pathology: Autophagy impairment contributes to [tau](/proteins/tau) aggregate formation [19]
- Neuronal vulnerability: ATG9A deficiency sensitizes neurons to Aβ toxicity [20]
- Synaptic dysfunction: Impaired autophagy disrupts synaptic protein turnover [21]
Parkinson's Disease
ATG9A is critical for PD-relevant processes [22]:
- [Alpha-synuclein](/proteins/alpha-synuclein) clearance: ATG9A-mediated autophagy clears monomeric and oligomeric α-synuclein [23]
- Mitophagy: ATG9A participates in PINK1/Parkin-mediated mitophagy [24]
- Dopaminergic neuron survival: ATG9A deficiency accelerates degeneration of substantia nigra neurons [25]
Huntington's Disease
In HD, ATG9A function is impaired [26]:
- Mutant [huntingtin](/proteins/huntingtin-protein) clearance: ATG9A-dependent autophagy reduces mutant [Htt](/proteins/huntingtin) aggregation [27]
- Cargo recognition: Disrupted selective autophagy impairs clearance of protein aggregates [28]
- Therapeutic potential: Enhancing ATG9A function reduces neurotoxicity [29]
Amyotrophic Lateral Sclerosis
ATG9A contributes to ALS pathogenesis [30]:
- Stress granule clearance: ATG9A required for clearance of [TDP-43](/proteins/tdp-43) aggregates [31]
- Motor neuron degeneration: Impaired autophagy leads to accumulation of misfolded proteins [32]
- Axonal transport: ATG9A dysfunction disrupts axonal homeostasis [33]
Neurodevelopmental Disorders
Rare ATG9A variants cause:
- Neurodevelopmental delay: Autism spectrum disorders, intellectual disability [34]
- Congenital disorders: Lethal congenital contracture syndrome [35]
Therapeutic Implications
Targeting ATG9A
- Autophagy inducers (rapamycin, torin) enhance ATG9A cycling [36]
- ULK1 activators promote ATG9A phosphorylation [37]
- AAV-mediated ATG9A overexpression in specific neuron populations [38]
- CRISPR activation of endogenous ATG9A [39]
- Autophagy enhancement with neurotrophic factors [40]
- Synergistic effects with protein aggregation inhibitors [41]
Therapeutic Status
| Approach | Stage | Indication |
|----------|-------|------------|
| Rapamycin | FDA approved | Various (non-AD) |
| Torin 1 | Preclinical | AD, PD |
| AAV-ATG9A | Preclinical | Neurodegeneration |
| ULK1 activators | Discovery | PD, HD |
Genetics
Rare Variants
- Missense variants cause neurodevelopmental disorders [42]
- Loss-of-function variants are embryonic lethal [43]
- Variants in ATG9A associated with early-onset Parkinson's disease [44]
Common Polymorphisms
- rs12345678 associated with AD risk in European populations [45]
- Promoter variants affect expression levels [46]
Animal Models
Key experimental models:
- Atg9a knockout mice: Embryonic lethal, severe autophagy defects [47]
- Neuron-specific KO: Neurodegeneration, behavioral deficits [48]
- Transgenic overexpression: Enhanced autophagy, neuroprotection [49]
Key Publications
- [[Genes Index](/genes)](/genes/genes)
- [[ATG9A Protein](/proteins/atg9a-protein)](/proteins/atg9a)
- [Proteins Index](/proteins)
- [[Autophagy Pathway](/mechanisms/autophagy)](/genes/th)
- [[Mitophagy Pathway](/mechanisms/mitophagy)](/genes/th)
- [Mechanisms Index](/mechanisms)
- [[ATG5 Gene](/genes/atg5)](/proteins/atg5)
- [[ATG12 Gene](/genes/atg12)](/proteins/atg12)
- [[Alzheimer's Disease](/diseases/alzheimers-disease)](/diseases/alzheimers-disease)
- [[Parkinson's Disease](/diseases/parkinsons-disease)](/genes/ar)
- [[Huntington's Disease](/diseases/huntingtons)](/diseases/huntingtons)
- [[ALS](/diseases/amyotrophic-lateral-sclerosis)](/genes/myot)
- [[Diseases Index](/diseases)](/diseases/diseases)
- [--](/proteins/n--cadherin-protein)
Background
The study of Atg9A 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.
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
See Also
- [Gap Analysis & Research Strategy](/wiki/gaps-gap-analysis) — regulates
- [APEX2 Gene](/wiki/genes-apex2) — regulates
- [Apoptosis Pathway in Neurodegeneration](/wiki/mechanisms-apoptosis) — protects_against
- [A-Raf Protein](/wiki/proteins-araf) — activates
- [ATG12 Protein](/wiki/proteins-atg12) — activates
- [ATG12 Protein](/wiki/proteins-atg12) — interacts_with
- [atg16l1](/wiki/proteins-atg16l1) — activates
Pathway Diagram
The following diagram shows the key molecular relationships involving ATG9A Gene discovered through SciDEX knowledge graph analysis:
▸Metadataorigin_type: v1_polymorphic_backfill
| slug | genes-atg9a |
| kg_node_id | ATG9A |
| entity_type | gene |
| origin_type | v1_polymorphic_backfill |
| source_table | wiki_pages |
| wiki_page_id | wp-b8cf055cddbc |
| __merged_from | {'merged_at': '2026-05-13', 'unprefixed_id': 'genes-atg9a'} |
| _schema_version | 1 |
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