MAP1LC3A Gene

MAP1LC3A Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MAP1LC3A Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>LC3</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>MAP1LC3A</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=LC3" target="_blank">Search NCBI</a></td>
</tr>
</table>

Pathway Diagram

MAP1LC3A Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MAP1LC3A Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>LC3</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>MAP1LC3A</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=LC3" target="_blank">Search NCBI</a></td>
</tr>
</table>

Pathway Diagram

Map1Lc3A 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.

:: infobox .infobox-gene [@kuma2018] Symbol: MAP1LC3A [@boland2018] Full Name: Microtubule Associated Protein 1 Light Chain 3 Alpha [@nixon2013] Chromosomal Location: 20q11.22 [@cheng2022] NCBI Gene ID: [9455](https://www.ncbi.nlm.nih.gov/gene/9455) [@lee2010] OMIM: [609453](https://www.omim.org/entry/609453) [@yamamoto2011] Ensembl ID: [ENSG00000101460](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000101460) [@song2022] UniProt: [Q9Y488](https://www.uniprot.org/uniprot/Q9Y488) [@cai2014] Proteins: [LC3A](/proteins/lc3a) [@ashkenazi2017] Associated Diseases: [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntington-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis)
::

Overview

MAP1LC3A (Microtubule-Associated Protein 1 Light Chain 3 Alpha) encodes LC3A, a fundamental protein in the [autophagy](/entities/autophagy) pathway. LC3A is a member of the LC3/GABARAP family, which are ubiquitin-like proteins essential for autophagosome formation and cargo recruitment. The MAP1LC3A gene produces multiple isoforms through alternative splicing, with LC3A being widely expressed in neural tissue. This protein plays critical roles in neuronal homeostasis, protein quality control, and cellular stress responses—all processes central to neurodegenerative disease pathogenesis.

Molecular Function

Autophagosome Biogenesis

LC3A undergoes post-translational processing to become functional. The precursor LC3 is first cleaved by ATG4B to generate LC3-I, which is then conjugated to phosphatidylethanolamine (PE) by the ATG7/ATG3 system to form LC3-II (lipidated LC3). LC3-II is directly integrated into the expanding autophagosome membrane, where it serves multiple essential functions:

• Membrane recruitment: LC3-II anchors to the growing phagophore membrane through its lipid moiety
• Cargo recognition: LC3A interacts with selective autophagy receptors (p62/SQSTM1, OPTN, NDP52) that recognize ubiquitinated cargo
• Fusion facilitation: LC3A facilitates autophagosome-lysosome fusion through interactions with the HOPS complex and LAMP proteins
• ER contact sites: LC3A localizes to ER-mitochondria contact sites and ER-phagophore contact sites

Homologs and Family

The LC3/GABARAP family includes:

• LC3A (MAP1LC3A), LC3B (MAP1LC3B), LC3C (MAP1LC3C)
• GABARAP, GABARAPL1, GABARAPL2/GATE-16

Expression Pattern

LC3A exhibits tissue-specific expression:

Brain

• [Neurons](/entities/neurons) throughout [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia, and cerebellum
• [Astrocytes](/entities/astrocytes) and oligodendrocytes
• Highest expression in regions with active protein turnover: hippocampus CA1 pyramidal cells, cerebellar Purkinje cells

Peripheral Tissues

• Heart, liver, kidney, lung, pancreas
• Skeletal muscle
• Immune cells (macrophages, dendritic cells)

Disease Associations

Alzheimer's Disease

LC3A and autophagy are implicated in AD through multiple mechanisms:

Research shows decreased LC3A expression in AD brain tissue, correlating with cognitive decline.

Parkinson's Disease

LC3A is central to PD pathogenesis:

Huntington's Disease

Amyotrophic Lateral Sclerosis (ALS)

Therapeutic Implications

Autophagy Modulation

Selective Autophagy Enhancement

Combination Approaches

Research Directions

Biomarkers

• LC3A expression levels in CSF as a biomarker for autophagic flux
• LC3A puncta in neurons as a marker of autophagy induction

See Also

• [Autophagy Pathway](/mechanisms/autophagy)
• [Mitophagy in Neurodegeneration](/mechanisms/mitophagy)
• [Protein Aggregation](/mechanisms/protein-aggregation)
• [LC3A Protein](/proteins/lc3a)
• [Gene index](/genes)

Background

The study of Map1Lc3A 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

Pathway Diagram

The following diagram shows the key molecular relationships involving MAP1LC3A Gene discovered through SciDEX knowledge graph analysis: