MAP1LC3A Gene

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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

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MAP1LC3A Gene

Introduction

Pathway Diagram

Mermaid diagram (expand to render)

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

These proteins have overlapping but distinct functions in autophagy.

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:

Amyloid clearance: Autophagy normally degrades [Aβ](/proteins/amyloid-beta); impaired LC3A function leads to Aβ accumulation

[Tau](/proteins/tau) pathology: Autophagy dysfunction contributes to tau aggregation and spread

Synaptic vulnerability: LC3A-mediated selective autophagy of synaptic proteins is disrupted in AD

Neuronal loss: Defective autophagy in vulnerable neurons precedes clinical symptoms

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

Parkinson's Disease

LC3A is central to PD pathogenesis:

[Alpha-synuclein](/proteins/alpha-synuclein) clearance: Selective autophagy via LC3A-p62 removes abnormal α-synuclein

Mitophagy: PINK1/Parkin-mediated mitophagy uses LC3A for damaged mitochondrion elimination

LRRK2 interaction: G2019S LRRK2 mutation impairs autophagic flux

Dopaminergic neuron vulnerability: High metabolic demand makes neurons dependent on LC3A-mediated quality control

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin) clearance: LC3A-mediated selective autophagy removes mutant HTT aggregates

Transcriptional dysregulation: LC3A interacts with transcription factors including REST

Neuronal dysfunction: Autophagy impairment contributes to progressive neurodegeneration

Amyotrophic Lateral Sclerosis (ALS)

Protein aggregate clearance: LC3A helps remove [TDP-43](/mechanisms/tdp-43-proteinopathy), SOD1, FUS aggregates

Stress granules: LC3A localizes to stress granules; prolonged stress leads to toxic aggregation

Axonal transport: LC3A-dependent autophagy maintains axonal homeostasis

Therapeutic Implications

Autophagy Modulation

LC3A activators: Small molecules enhancing LC3A lipidation (e.g., rapamycin analogs)

ATG4B modulators: Inhibitors to prevent LC3A delipidation and stabilize autophagosomes

Gene therapy: Viral vectors delivering functional MAP1LC3A to enhance autophagy

Selective Autophagy Enhancement

p62/OPTN agonists: Enhance selective autophagy of protein aggregates

Mitophagy inducers: Target PINK1/Parkin pathway to enhance mitochondrial clearance

ER-phagophore contact modulation: Improve early autophagosome formation

Combination Approaches

Autophagy + anti-aggregation: Combined autophagy enhancement with Aβ/α-synuclein immunotherapies

Neuroprotective compounds: Flavonoids and polyphenols that upregulate LC3A expression

Lifestyle interventions: Caloric restriction and exercise that enhance neuronal autophagy

Research Directions

Biomarkers

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

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

[Mizushima N, Yoshimori T, Ohsumi Y, "The role of Atg proteins in autophagosome formation." Annual Review of Cell and Developmental Biology (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21801009/)

[Kuma A, Komatsu M, Mizushima N, "Autophagy-independent function of MAP1LC3 family proteins." Autophagy (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29257353/)

[Boland B, Yu WH, Corti O, et al, "Promoting the clearance of neurotoxic proteins in neurodegenerative disorders." Nature Reviews Neurology (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29980754/)

[Nixon RA, "The role of autophagy in neurodegenerative disease." Nature Medicine (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/23921753/)

[Cheng J, Laird AE, Mauczuk K, et al, "Autophagy regulation by LC3 family proteins in neurodegenerative diseases." Cell Death & Disease (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35654814/)

[Lee JH, Yu WH, Kumar A, et al, "Lysosomal proteolysis inhibition causes selective accumulation of autophagosomes in Alzheimer's disease." Nature (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20445626/)

[Yamamoto A, Simonsen A, "The impairment of autophagy as a pathological mechanism in Alzheimer's disease." Molecular and Cellular Neurosciences (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21893245/)

[Song P, Li S, Wu H, et al, "LRRK2 and autophagic dysfunction in Parkinson's disease." Neurobiology of Disease (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35247688/)

[Cai Q, Zakaria HM, Lee JG, "Spatial parkin entanglement in mitochondrial quality control." Trends in Neurosciences (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24429115/)

[Ashkenazi A, Bento CF, Ricketts T, et al, "Polyglutamine disease: when aggregation goes awry." Neuron (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28577976/)

Pathway Diagram

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

Mermaid diagram (expand to render)

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MAP1LC3A Gene

MAP1LC3A Gene

Introduction

Pathway Diagram

MAP1LC3A Gene

Introduction

Pathway Diagram

Overview

Molecular Function

Autophagosome Biogenesis

Homologs and Family

Expression Pattern

Brain

Peripheral Tissues

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Huntington's Disease

Amyotrophic Lateral Sclerosis (ALS)

Therapeutic Implications

Autophagy Modulation

Selective Autophagy Enhancement

Combination Approaches

Research Directions

Biomarkers

See Also

Background

External Links

References

Pathway Diagram