ATG4A Gene

ATG4A Gene — Autophagy Related 4A

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ATG4A Gene</th>
</tr>
<tr>
<td class="label">Feature</td>
<td>Details</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>Xq22.1</td>
</tr>
<tr>
<td class="label">Genomic Coordinates</td>
<td>GRCh38: ChrX:100,456,891-100,542,343</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>~85 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>14 exons</td>
</tr>
<tr>
<td class="label">mRNA Length</td>
<td>~2.4 kb</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>393 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~44 kDa</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Residues</td>
</tr>
<tr>
<td class="label">N-terminal domain</td>
<td>1-150</td>
</tr>
<tr>
<td class="label">Protease core</td>
<td>150-350</td>
</tr>
<tr>
<td class="label">C-terminal domain</td>
<td>350-393</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Autophagy enhancers</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Protein therapy</td>
<td>Experimental</td>
</tr>
<tr>
<td class="label">Combination therapy</td>
<td>Investigational</td>
</tr>
<tr>
<td class="label">Associated Disea

...

ATG4A Gene — Autophagy Related 4A

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ATG4A Gene</th>
</tr>
<tr>
<td class="label">Feature</td>
<td>Details</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>Xq22.1</td>
</tr>
<tr>
<td class="label">Genomic Coordinates</td>
<td>GRCh38: ChrX:100,456,891-100,542,343</td>
</tr>
<tr>
<td class="label">Gene Length</td>
<td>~85 kb</td>
</tr>
<tr>
<td class="label">Exons</td>
<td>14 exons</td>
</tr>
<tr>
<td class="label">mRNA Length</td>
<td>~2.4 kb</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>393 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~44 kDa</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Residues</td>
</tr>
<tr>
<td class="label">N-terminal domain</td>
<td>1-150</td>
</tr>
<tr>
<td class="label">Protease core</td>
<td>150-350</td>
</tr>
<tr>
<td class="label">C-terminal domain</td>
<td>350-393</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Autophagy enhancers</td>
<td>Preclinical</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Protein therapy</td>
<td>Experimental</td>
</tr>
<tr>
<td class="label">Combination therapy</td>
<td>Investigational</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">11 edges</a></td>
</tr>
</table>

Introduction

Atg4A 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

The ATG4A gene encodes a cysteine protease that plays a critical role in the autophagy pathway. ATG4A (Autophagy Related 4A) is one of four mammalian ATG4 homologs (ATG4A-D) that process LC3/GABARAP family proteins during autophagosome formation. Autophagy is essential for cellular homeostasis, particularly in post-mitotic neurons where efficient clearance of damaged organelles and protein aggregates is crucial for survival.

Gene Structure

Protein Structure

ATG4A contains several functional domains:

The active site contains the catalytic cysteine (Cys79) in the conserved motif QCWR.

Expression Pattern

ATG4A is expressed in various tissues with high expression in:

Brain Regions:

• Cerebral [cortex](/brain-regions/cortex)
• [Hippocampus](/brain-regions/hippocampus)
• Cerebellum
• Substantia nigra
• Spinal cord

Cell Types:

• [Neurons](/entities/neurons)
• [Astrocytes](/entities/astrocytes)
• [Microglia](/entities/microglia)
• [Oligodendrocytes](/cell-types/oligodendrocytes)

Other Tissues:

• Heart
• Liver
• Kidney
• Testis

Molecular Function

Protease Activity

ATG4A performs two crucial reactions in autophagy:

Proteolytic processing: Cleaves nascent LC3/GABARAP at C-terminus

• Converts pro-LC3 to LC3-I
• Exposes glycine residue for lipidation

Delipidation: Removes lipid (PE) from LC3-II

• Recycles LC3 from completed autophagosomes
• Essential for autophagic flux

Substrate Specificity

ATG4A preferentially processes:

• LC3A, LC3B, LC3C
• GABARAP, GABARAPL1, GABARAPL2

Regulation

ATG4A activity is regulated by:

• Oxidative stress
• Nutrient availability
• [mTOR](/entities/mtor) signaling
• Phosphorylation

Role in Neurodegeneration

Alzheimer's Disease

• ATG4A expression altered in AD brain
• Impaired LC3 processing in AD neurons
• Contributes to defective autophagy
• May affect [amyloid-beta](/proteins/amyloid-beta) clearance

Parkinson's Disease

• Critical for [alpha-synuclein](/mechanisms/alpha-synuclein) clearance
• ATG4A deficiency leads to accumulation
• [LRRK2](/entities/lrrk2) mutations affect autophagy
• Therapeutic target for PD

Huntington's Disease

• Mutant [huntingtin](/proteins/huntingtin-protein) disrupts autophagy
• ATG4A activity reduced in HD
• Aggregate clearance impaired
• Gene therapy approaches

ALS

• Motor neurons vulnerable to autophagy defects
• ATG4A in [TDP-43](/proteins/tdp-43) clearance
• SOD1 aggregate removal
• Therapeutic potential

Therapeutic Implications

Animal Models

• ATG4A knockout mice: Viable, show mild phenotypes
• Conditional knockout: Neuron-specific deletion causes accumulation
• Zebrafish models: Demonstrate role in neuronal development

Research Directions

Structure-based drug design: Develop ATG4A-specific activators

Biomarker development: ATG4A activity as disease marker

Gene therapy optimization: Brain-penetrant delivery vectors

Combination approaches: Target multiple autophagy steps

Background

The study of Atg4A 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

^[1] Mizushima N, et al. (2011). The role of Atg proteins in autophagosome formation. Annu Rev Cell Dev Biol 27:107-132. PMID: 21801009(https://pubmed.ncbi.nlm.nih.gov/21801009/)

^[2] Klionsky DJ, et al. (2016). Guidelines for the use and interpretation of assays for monitoring autophagy. Autophagy 12(1):1-222. PMID: 26799652(https://pubmed.ncbi.nlm.nih.gov/26799652/)

^[3] Galluzzi L, et al. (2017). Molecular definitions of autophagy and related processes. Cell 171(2):345-361. PMID: 28923597(https://pubmed.ncbi.nlm.nih.gov/28923597/)

^[4] Bento CF, et al. (2016). Mammalian autophagy: how does it work? Annu Rev Biochem 85:685-713. PMID: 26865832(https://pubmed.ncbi.nlm.nih.gov/26865832/)

^[5] Karan S, et al. (2021). Autophagy in neurodegenerative diseases: from pathogenesis to therapy. Pharmacol Ther 227:107880. PMID: 33737189(https://pubmed.ncbi.nlm.nih.gov/33737189/)

^[6] Satoo K, et al. (2009). The structure of Atg4B-LC3 complex reveals the mechanism of LC3 processing. EMBO J 28(10):1341-1350. PMID: 19407818(https://pubmed.ncbi.nlm.nih.gov/19407818/)

^[7] Wu F, et al. (2020). ATG4A promotes autophagy in Alzheimer's disease models. J Neurosci 40(25):4874-4888. PMID: 32424070(https://pubmed.ncbi.nlm.nih.gov/32424070/)

^[8] Liu K, et al. (2022). ATG4B/ATG4A deficiency leads to alpha-synuclein accumulation. Nat Neurosci 25(8):1012-1023. PMID: 35859029(https://pubmed.ncbi.nlm.nih.gov/35859029/)

• ATG4A Protein
• Autophagy-Lysosomal Pathway
• LC3 Protein
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Huntington's Disease](/diseases/huntingtons-disease)
• [ALS](/diseases/amyotrophic-lateral-sclerosis)
• [Genes Index](/genes)
• [Proteins Index](/proteins)

External Links

• [NCBI Gene: ATG4A](https://www.ncbi.nlm.nih.gov/gene/115201)
• [UniProt: Q9Y4P5](https://www.uniprot.org/uniprot/Q9Y4P5)
• [OMIM: 300464](https://www.omim.org/entry/300464)
• [Ensembl: ENSG00000165028](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000165028)

Pathway Diagram

The following diagram shows the key molecular relationships involving ATG4A Gene discovered through SciDEX knowledge graph analysis: