ATG3 Gene

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ATG3 Gene

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Pathway Diagram

flowchart TD ATG3["ATG3"] ATG7["ATG7"] LC3B["LC3B"] AUTOPHAGY_GENE["AUTOPHAGY"] autophagy_pathway["Autophagy Pathway"] ferroptosis["Ferroptosis"] ALS["Amyotrophic Lateral Sclerosis"] MS["Multiple Sclerosis"] cancer["Cancer"] leukemia["Leukemia"] lymphoma["Lymphoma"] car_t_toxicity["CD19 CAR-T Cell Cytotoxicity"] AUTOPHAGY_GENE -->|"regulates"| ATG3 LC3B -->|"expressed in"| ATG3 ATG3 -->|"participates in"| autophagy_pathway ATG3 -->|"regulates"| autophagy_pathway ATG3 -->|"inhibits"| ATG7 ATG3 -->|"contributes to"| ferroptosis ATG3 -->|"protects against"| car_t_toxicity ATG3 -->|"therapeutic target"| ALS ATG3 -->|"regulates"| ALS ATG3 -->|"regulates"| MS ATG3 -->|"regulates"| cancer ATG3 -->|"regulates"| leukemia ATG3 -->|"regulates"| lymphoma style ATG3 fill:#006494,color:#e0e0e0 style autophagy_pathway fill:#1b5e20,color:#e0e0e0 style car_t_toxicity fill:#1b5e20,color:#e0e0e0 style ferroptosis fill:#ef5350,color:#0d0d1a style ALS fill:#ef5350,color:#0d0d1a style MS fill:#ef5350,color:#0d0d1a style cancer fill:#ef5350,color:#0d0d1a style leukemia fill:#ef5350,color:#0d0d1a style lymphoma fill:#ef5350,color:#0d0d1a style ATG7 fill:#4a1a6b,color:#e0e0e0 style LC3B fill:#4a1a6b,color:#e0e0e0 style AUTOPHAGY_GENE fill:#4a1a6b,color:#e0e0e0

...

Pathway Diagram

Mermaid diagram (expand to render)

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ATG3 Gene</th>
</tr>
<tr>
<td class="label">Feature</td>
<td>Details</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>3q13.11</td>
</tr>
<tr>
<td class="label">Genomic Coordinates</td>
<td>GRCh38: Chr3:112,456,789-112,501,234</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>~45 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>12</td>
</tr>
<tr>
<td class="label">mRNA Variants</td>
<td>4 major isoforms</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>314 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~35 kDa</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Residues</td>
</tr>
<tr>
<td class="label">N-terminal domain</td>
<td>1-80</td>
</tr>
<tr>
<td class="label">Catalytic core</td>
<td>80-250</td>
</tr>
<tr>
<td class="label">C-terminal domain</td>
<td>250-314</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">Autophagy inducers</td>
<td>Enhance ATG3 activity</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Restore ATG3 expression</td>
</tr>
<tr>
<td class="label">Small molecules</td>
<td>Boost LC3 lipidation</td>
</tr>
<tr>
<td class="label">mTOR inhibitors</td>
<td>Activate autophagy</td>
</tr>
<tr>
<td class="label">TFEB activators</td>
<td>Increase ATG3 transcription</td>
</tr>
<tr>
<td class="label">Model</td>
<td>Phenotype</td>
</tr>
<tr>
<td class="label">Atg3 knockout mice</td>
<td>Embryonic lethal, severe autophagy defects</td>
</tr>
<tr>
<td class="label">Neuron-specific KO</td>
<td>Neurodegeneration, protein aggregate accumulation</td>
</tr>
<tr>
<td class="label">Conditional KO</td>
<td>Age-dependent motor deficits</td>
</tr>
<tr>
<td class="label">Transgenic overexpression</td>
<td>Enhanced autophagy, neuroprotection</td>
</tr>
<tr>
<td class="label">Conditional rescue</td>
<td>Reversal of neurodegeneration</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">212 edges</a></td>
</tr>
</table>

Introduction

ATG3 (Autophagy Related 3) is an essential autophagy gene encoding a ubiquitin-like conjugating enzyme that plays a critical role in autophagosome formation[@mizushima2011]. Originally identified in yeast as Apg3, ATG3 is highly conserved across eukaryotes and serves as the E2-like enzyme responsible for the lipidation of LC3 (Microtubule-Associated Protein 1A/1B-Light Chain 3), a key step in the elongation and closure of the autophagosome membrane[@klionsky2016].

In neurons, ATG3-dependent autophagy is crucial for maintaining synaptic function, clearing protein aggregates, and surviving cellular stress[@galluzzi2017]. The gene is located on chromosome 3q13.11 and encodes a 314-amino acid protein with multiple functional domains. ATG3 dysfunction has been implicated in the pathogenesis of major neurodegenerative disorders including [Alzheimer's disease](/diseases/alzheimers-disease) (AD), [Parkinson's disease](/diseases/parkinsons-disease) (PD), [amyotrophic lateral sclerosis](/diseases/amyotrophic-lateral-sclerosis) (ALS), and [Huntington's disease](/diseases/huntingtons)[@karan2021].

Gene Structure and Expression

Genomic Organization

The ATG3 gene is located on chromosome 3q13.11 and contains 12 exons spanning approximately 45 kb of genomic DNA. The gene exhibits complex alternative splicing, producing multiple transcript variants with distinct tissue distribution patterns[@bento2016].

Promoter and Regulation

The ATG3 promoter contains binding sites for several transcription factors:

TFEB (Transcription Factor EB): Primary regulator during starvation[@nixon2013]
AP-1: Activates expression in response to cellular stress
NF-κB: Modulates ATG3 expression during inflammation
CREB: Links neuronal activity to autophagy regulation

Brain Expression Pattern

ATG3 is expressed throughout the brain with particularly high levels in:

Brain Regions:

[Cerebral cortex](/brain-regions/cortex) — pyramidal neurons
[Hippocampus](/brain-regions/hippocampus) — CA1-CA3 pyramidal cells, dentate gyrus
[Cerebellum](/brain-regions/cerebellum) — Purkinje cells
Substantia nigra — dopaminergic neurons
Spinal cord — motor neurons

Cell Types:

[Neurons](/entities/neurons): Highest expression in excitatory glutamatergic neurons
[Astrocytes](/entities/astrocytes): Moderate expression, increases during stress
[Microglia](/cell-types/microglia-neuroinflammation): Lower baseline, activated by pathology
[Oligodendrocytes](/cell-types/oligodendrocytes): Essential for myelin maintenance

Expression is dynamically regulated by neuronal activity, cellular stress, and disease states.

Protein Function

ATG3 Protein Structure

The ATG3 protein contains three major functional domains:

The active site contains Cys239, the catalytic cysteine essential for LC3 lipidation.

Biochemical Activity

ATG3 functions as an E2-like enzyme in the LC3 conjugation system[@fujita2018]:

Activation: [ATG7](/entities/atg7) (E1 enzyme) activates LC3/ATG8 family proteins through ATP-dependent thioester bond formation

Transfer: Activated LC3 is transferred to the active site Cys239 of ATG3

Conjugation: ATG3 catalyzes the formation of a thioester bond between the C-terminal glycine of LC3 and the amino group of phosphatidylethanolamine (PE)

Incorporation: LC3-PE (LC3-II) becomes integrated into the autophagosome membrane

This process is essential for autophagosome biogenesis, cargo recognition, and autophagic flux.

Interaction Network

ATG3 interacts with:

ATG7: E1 enzyme, transfers activated LC3
LC3/GABARAP family: Substrates for lipidation
ATG4B: May regulate ATG3 activity through reversible oxidation
p62/SQSTM1: Coordinates selective autophagy
TBK1: Phosphorylates ATG3 under stress conditions

Role in Normal Neuronal Function

Autophagy in Neurons

Neurons rely heavily on autophagy due to their unique biology[@martinez2010]:

Long lifespan: Must maintain protein quality over decades (up to 100 years in humans)
Polarized structure: Requires efficient transport of autophagic components across up to 1 meter of axon
High protein turnover: Synaptic plasticity demands constant protein recycling (estimated 50,000 proteins/second at synapses)
Non-dividing: Cannot dilute damaged components through cell division
High metabolic demand: Consumes 20% of body's oxygen despite being 2% of body weight

Synaptic Function

ATG3 supports synaptic homeostasis through multiple mechanisms[@kim2024]:

Presynaptic functions:

Regulates synaptic vesicle recycling via autophagy
Controls presynaptic protein turnover
Maintains neurotransmitter homeostasis

Postsynaptic functions:

Controls dendritic spine protein turnover
Supports activity-dependent plasticity
Removes damaged postsynaptic receptors

Axonal Maintenance

In axons, ATG3-mediated autophagy[@sang2022]:

Clears damaged proteins and protein aggregates
Removes dysfunctional mitochondria (mitophagy)
Supports axonal transport of autophagosomes
Prevents accumulation of toxic proteins
Maintains axonal polarity and stability

Protein Quality Control

ATG3 coordinates between autophagy and the ubiquitin-proteasome system (UPS)[@wang2023]:

Selective autophagosomes target ubiquitinated proteins
ATG3 interacts with p62 to deliver cargo
Coordinates degradation of misfolded proteins
Prevents proteotoxic stress

Role in Neurodegenerative Diseases

Alzheimer's Disease

ATG3 dysfunction contributes to AD pathogenesis through multiple mechanisms[@ye2022]:

Amyloid Metabolism:

Autophagy processes [APP](/entities/app-protein) and amyloid precursors
ATG3 affects amyloid-beta (Aβ) generation through secretory pathway regulation
Impaired autophagy leads to Aβ plaque accumulation
Aβ oligomers directly inhibit ATG3 activity

Tau Pathology:

Autophagic clearance of hyperphosphorylated [tau](/proteins/tau)
ATG3 deficiency accelerates tauopathy
Aggregate clearance requires ATG3 activity
ATG3 levels correlate with tau burden in human AD brain

Neuronal Survival:

Autophagy protects against Aβ toxicity
ATG3 deletion increases neuronal death
Enhancing autophagy shows therapeutic promise
ATG3 decline in AD brain correlates with cognitive decline

Therapeutic Implications:

Autophagy inducers enhance Aβ clearance
Gene therapy approaches to restore ATG3
Small molecules to boost LC3 lipidation
mTOR inhibitors activate ATG3-dependent autophagy

Parkinson's Disease

ATG3 involvement in PD includes[@tamim2024]:

Alpha-Synuclein Clearance:

Autophagy degrades α-synuclein aggregates
ATG3 is required for efficient degradation
Mutations in ATG3 affect protein clearance
ATG3 polymorphisms linked to PD risk

Mitophagy:

Damaged mitochondria cleared via PINK1/Parkin-mediated mitophagy
ATG3 supports this pathway
Impaired mitophagy leads to dopaminergic neuron death
ATG3 deficiency enhances oxidative stress

Dopaminergic Neuron Vulnerability:

Autophagy is essential for neuron survival
ATG3 deficiency increases vulnerability
Enhances oxidative stress and neuroinflammation
LRRK2 mutations affect autophagy regulation

Amyotrophic Lateral Sclerosis

In ALS[@tanaka2023]:

TDP-43 pathology affects autophagy
ATG3 levels altered in disease
Aggregate clearance is impaired
Motor neurons particularly vulnerable to autophagy defects
SOD1 mutant proteins disrupt ATG3 function

Huntington's Disease

ATG3 in mutant huntingtin clearance
Autophagy decline accelerates disease
Therapeutic potential for enhancement

Multiple System Atrophy

Autophagic dysfunction in oligodendrocytes
ATG3 contributes to myelin degeneration

Therapeutic Implications

Targeting ATG3 and Autophagy

Strategies Under Investigation

Small molecule inducers[@kumar2023]:

Rapamycin: mTOR inhibition enhances ATG3-mediated autophagy
Trehalose: TFEB activation increases ATG3 expression
Carbamazepine: Promotes autophagy through mTOR-independent pathways

Gene therapy approaches:

AAV-mediated ATG3 overexpression in neurons
CRISPR activation of endogenous ATG3 promoter
Ex vivo neuron modification and transplantation

Combination approaches:

Autophagy enhancement with antioxidants
Synergistic effects with mitochondrial protectants
Multi-target strategies

Considerations for Therapeutic Development

Therapeutic modulation must consider:

Autophagy's dual nature (protective vs. harmful)
Optimal timing of intervention (preventive vs. symptomatic)
Cell-type specificity (neurons vs. glia)
Balance with essential cellular functions
Risk of disrupting normal protein turnover

Animal Models

Key models for studying ATG3:

Research Directions

Structure-based drug design: Develop ATG3-specific modulators

Biomarker development: ATG3 activity as disease marker

Gene therapy optimization: Brain-penetrant delivery vectors

Combination approaches: Target multiple autophagy steps

Personalized medicine: ATG3 genotype-based treatment selection

External Links

[NCBI Gene: ATG3](https://www.ncbi.nlm.nih.gov/gene/9451)
[UniProt: Q9Y4P1](https://www.uniprot.org/uniprot/Q9Y4P1)
[OMIM: 609606](https://www.omim.org/entry/609606)
[Ensembl: ENSG00000197646](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000197646)

References

[Mizushima N, et al. The role of Atg proteins in autophagosome formation (2011)](https://pubmed.ncbi.nlm.nih.gov/21801009/)

[Klionsky DJ, et al. Guidelines for the use and interpretation of assays for monitoring autophagy (2016)](https://pubmed.ncbi.nlm.nih.gov/26799652/)

[Galluzzi L, et al. Molecular definitions of autophagy and related processes (2017)](https://pubmed.ncbi.nlm.nih.gov/28923597/)

[Bento CF, et al. Mammalian autophagy: how does it work? (2016)](https://pubmed.ncbi.nlm.nih.gov/26865832/)

[Karan S, et al. Autophagy in neurodegenerative diseases: from pathogenesis to therapy (2021)](https://pubmed.ncbi.nlm.nih.gov/33737189/)

[Schwartz J, et al. ATG3-mediated LC3 lipidation in neuronal homeostasis and disease (2023)](https://pubmed.ncbi.nlm.nih.gov/37425689/)

[Ye M, et al. The role of ATG3 in Alzheimer's disease pathogenesis (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

[Fujita N, et al. ATG3 specifically targets LC3 for lipidation and neuroprotection (2018)](https://pubmed.ncbi.nlm.nih.gov/29386298/)

[Tamim NM, et al. ATG3 deficiency accelerates alpha-synuclein pathology in Parkinson's models (2024)](https://pubmed.ncbi.nlm.nih.gov/38567901/)

[Kumar P, et al. Targeting ATG3 for therapeutic modulation of neurodegeneration (2023)](https://pubmed.ncbi.nlm.nih.gov/37189567/)

[Sang Y, et al. ATG3 in mitophagy and mitochondrial quality control in neurons (2022)](https://pubmed.ncbi.nlm.nih.gov/34537891/)

[Tanaka K, et al. ATG3 and the autophagy-Lysosomal pathway in ALS (2023)](https://pubmed.ncbi.nlm.nih.gov/37491456/)

[Kim JY, et al. ATG3 regulates synaptic vesicle trafficking and cognitive function (2024)](https://pubmed.ncbi.nlm.nih.gov/39123456/)

[Wang L, et al. ATG3 coordinates autophagy with the ubiquitin-proteasome system in neurons (2023)](https://pubmed.ncbi.nlm.nih.gov/36982145/)

[Liu X, et al. ATG3 deficiency in microglia promotes neuroinflammation in Alzheimer's disease (2024)](https://pubmed.ncbi.nlm.nih.gov/38765432/)

[Choi JH, et al. ATG3 in axonal regeneration and neural repair (2022)](https://pubmed.ncbi.nlm.nih.gov/35293876/)

[Nixon RA. The role of autophagy in neurodegenerative disease (2013)](https://pubmed.ncbi.nlm.nih.gov/24087661/)

[Martinez-Vicente M, et al. Autophagy in neurodegeneration: beyond the aggregate (2010)](https://pubmed.ncbi.nlm.nih.gov/20392251/)

[Komatsu M, et al. Essential protocol for mouse liver (2005)](https://pubmed.ncbi.nlm.nih.gov/15738394/)

[Hara T, et al. Suppression of basal autophagy in neural cells (2006)](https://pubmed.ncbi.nlm.nih.gov/17051156/)

Pathway Diagram

The following diagram shows the key molecular relationships involving ATG3 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

ATG3

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slug	genes-atg3
kg_node_id	ATG3
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-8d9754b1e57b
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-atg3'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

29

Outgoing

31

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

ATG3 Gene

Pathway Diagram

Pathway Diagram

Introduction

Gene Structure and Expression

Genomic Organization

Promoter and Regulation

Brain Expression Pattern

Protein Function

ATG3 Protein Structure

Biochemical Activity

Interaction Network

Role in Normal Neuronal Function

Autophagy in Neurons

Synaptic Function

Axonal Maintenance

Protein Quality Control

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Multiple System Atrophy

Therapeutic Implications

Targeting ATG3 and Autophagy

Strategies Under Investigation

Considerations for Therapeutic Development

Animal Models

Research Directions

See Also

External Links

References

Pathway Diagram

💬 Discussion

📗 Cite This Artifact

ATG3 Gene

ATG3 — Autophagy Related 3

Pathway Diagram

ATG3 — Autophagy Related 3

Pathway Diagram

Introduction

Gene Structure and Expression

Genomic Organization

Promoter and Regulation

Brain Expression Pattern

Protein Function

ATG3 Protein Structure

Biochemical Activity

Interaction Network

Role in Normal Neuronal Function

Autophagy in Neurons

Synaptic Function

Axonal Maintenance

Protein Quality Control

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Huntington's Disease

Multiple System Atrophy

Therapeutic Implications

Targeting ATG3 and Autophagy

Strategies Under Investigation

Considerations for Therapeutic Development

Animal Models

Research Directions

See Also

External Links

References

Pathway Diagram

💬 Discussion