MAP1A Gene

MAP1A Gene

Introduction

Map1A 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.

<div class="infobox infox-gene"> [@vaillant1999]
<div class="infobox-header">Gene Information</div> [@mandelkow2014]
<table class="infobox-table"> [@dubey2007]
<tr><th>Symbol</th><td><strong>MAP1A</strong></td></tr> [@baas1990]
<tr><th>Full Name</th><td>Microtubule Associated Protein 1A</td></tr> [@kneussel2013]
<tr><th>Chromosome</th><td>15q15.2</td></tr> [@giacomello2020]
<tr><th>NCBI Gene ID</th><td>[4130](https://www.ncbi.nlm.nih.gov/gene/4130)</td></tr> [@guo2023]
<tr><th>OMIM</th><td>[157138](https://www.omim.org/entry/157138)</td></tr> [@wang2006]
<tr><th>Ensembl ID</th><td>[ENSG00000118789](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000118789)</td></tr> [@kanaan2023]
<tr><th>UniProt ID</th><td>[P78527](https://www.uniprot.org/uniprot/P78527)</td></tr>
<tr><th>Protein Length</th><td>2,248 amino acids</td></tr>
<tr><th>Molecular Weight</th><td>~250 kDa</td></tr>
<tr><th>Expression</th><td>Brain-specific, high in hippocampus and cortex</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

MAP1A Gene

Introduction

Map1A 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.

<div class="infobox infox-gene"> [@vaillant1999]
<div class="infobox-header">Gene Information</div> [@mandelkow2014]
<table class="infobox-table"> [@dubey2007]
<tr><th>Symbol</th><td><strong>MAP1A</strong></td></tr> [@baas1990]
<tr><th>Full Name</th><td>Microtubule Associated Protein 1A</td></tr> [@kneussel2013]
<tr><th>Chromosome</th><td>15q15.2</td></tr> [@giacomello2020]
<tr><th>NCBI Gene ID</th><td>[4130](https://www.ncbi.nlm.nih.gov/gene/4130)</td></tr> [@guo2023]
<tr><th>OMIM</th><td>[157138](https://www.omim.org/entry/157138)</td></tr> [@wang2006]
<tr><th>Ensembl ID</th><td>[ENSG00000118789](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000118789)</td></tr> [@kanaan2023]
<tr><th>UniProt ID</th><td>[P78527](https://www.uniprot.org/uniprot/P78527)</td></tr>
<tr><th>Protein Length</th><td>2,248 amino acids</td></tr>
<tr><th>Molecular Weight</th><td>~250 kDa</td></tr>
<tr><th>Expression</th><td>Brain-specific, high in hippocampus and cortex</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

Microtubule Associated Protein 1A (MAP1A) is a neuron-specific cytoskeletal protein encoded by the MAP1A gene located on chromosome 15q15.2. MAP1A plays essential roles in microtubule stabilization, axonal transport, synaptic plasticity, and neuronal survival. As a member of the microtubule-associated protein family, MAP1A is critically involved in maintaining neuronal architecture and function, making it a protein of significant interest in neurodegenerative disease research.

Gene Structure and Expression

The MAP1A gene spans approximately 45 kb of genomic DNA and consists of multiple exons that undergo alternative splicing to generate distinct protein isoforms. The gene is expressed predominantly in the central nervous system, with highest expression levels in the hippocampus, cerebral cortex, and cerebellum. Within [neurons](/entities/neurons), MAP1A is enriched in dendrites and axons, where it associates with microtubules to regulate cytoskeletal dynamics and intracellular trafficking.

Regional Expression Patterns

MAP1A expression varies across brain regions and cell types:

• [Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
• [Cortex](/brain-regions/cortex): Strong expression in layer II-III pyramidal neurons
• Cerebellum: Abundant in Purkinje cells and granule cells
• Basal ganglia: Moderate expression in striatal medium spiny neurons
• Brainstem: Present in various nuclei including the locus coeruleus

Protein Structure and Molecular Function

Domain Architecture

MAP1A is a large protein (~250 kDa) characterized by several functional domains:

Molecular Functions

MAP1A participates in several critical cellular processes:

• Microtubule Stabilization: Promotes microtubule assembly and prevents depolymerization, essential for maintaining axonal integrity
• Axonal Transport Facilitation: Functions as a molecular scaffold for motor protein complexes, enabling efficient transport of vesicles, organelles, and signaling molecules along microtubules
• Synaptic Plasticity: Regulates dendritic spine morphology and synaptic vesicle cycling, influencing learning and memory
• Neuronal Development: Supports axonal growth cone guidance and neuronal polarization during development

Role in Neurodegenerative Diseases

Alzheimer's Disease

MAP1A has emerged as a significant player in Alzheimer's disease pathogenesis:

• [Tau Protein](/proteins/tau) Interaction: MAP1A shares functional similarities with tau protein and may compensate for tau loss in certain contexts. In AD, tau pathology may disrupt MAP1A-microtubule interactions
• Altered Expression: Post-mortem studies show reduced MAP1A expression in AD hippocampus, correlating with cognitive decline
• [Amyloid-Beta](/proteins/amyloid-beta) Effects: Aβ oligomers disrupt microtubule function and may downregulate MAP1A expression
• Axonal Transport Deficits: Early axonal transport defects in AD involve microtubule dysfunction, in which MAP1A plays a role

Parkinson's Disease

In Parkinson's disease, MAP1A contributes to:

• [Alpha-Synuclein](/mechanisms/alpha-synuclein) Transport: MAP1A may facilitate intracellular trafficking of α-synuclein; dysfunction could contribute to protein aggregation
• Dopaminergic Neuron Vulnerability: The microtubule cytoskeleton in dopaminergic neurons may be particularly susceptible to MAP1A dysfunction
• Axonal Degeneration: Early axonal pathology in PD involves microtubule destabilization

Huntington's Disease

MAP1A alterations in HD include:

• Microtubule Dysfunction: Mutant [huntingtin](/proteins/huntingtin-protein) protein impairs microtubule-based transport, affecting MAP1A function
• Dendritic Spine Loss: Synaptic pathology in HD involves alterations in MAP1A-mediated plasticity
• Energy Metabolism: Axonal transport deficits compound mitochondrial dysfunction in HD

Amyotrophic Lateral Sclerosis

In ALS, MAP1A plays a role in:

• Axonal Transport Defects: Early and prominent axonal transport dysfunction in ALS involves microtubule disruption
• Motor Neuron Vulnerability: MAP1A dysfunction may contribute to the selective vulnerability of upper motor neurons
• Protein Aggregation: Co-localization studies suggest interactions between MAP1A and ALS-associated protein aggregates

Therapeutic Implications

Microtubule-Targeting Strategies

Given the central role of microtubule dysfunction in neurodegeneration, MAP1A-related pathways offer therapeutic opportunities:

• Microtubule-Stabilizing Drugs: Compounds like taxols and their derivatives may compensate for MAP1A loss
• Small Molecule Modulators: Development of drugs that enhance MAP1A-microtubule interactions
• Phosphorylation Modulators: Kinase inhibitors targeting tau kinases (GSK3β, CDK5) may indirectly improve MAP1A function

Gene Therapy Approaches

• MAP1A Overexpression: Viral vector-mediated delivery to restore MAP1A levels
• Microtubule Motor Enhancers: Gene therapy to boost motor protein function
• Combination Therapies: Targeting multiple aspects of cytoskeletal dysfunction

Biomarker Potential

MAP1A in cerebrospinal fluid (CSF) has been investigated as a biomarker:

• CSF Levels: Altered MAP1A concentrations in neurodegenerative disease CSF
• Diagnostic Utility: Potential for differential diagnosis
• Disease Progression: Correlation with disease severity

See Also

• [Microtubules](/entities/microtubules) - The cytoskeletal structures stabilized by MAP1A
• [Tau Protein](/proteins/tau) - Another microtubule-associated protein in AD
• [Alpha-Synuclein](/proteins/alpha-synuclein) - Protein aggregator in PD
• [Axonal Transport](/mechanisms/axonal-transport) - Process facilitated by MAP1A
• [Alzheimer's Disease](/diseases/alzheimers-disease) - AD disease page
• [Parkinson's Disease](/diseases/parkinsons-disease) - PD disease page
• [Amyotrophic Lateral Sclerosis](/diseases/als) - ALS disease page

Background

The study of Map1A 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 MAP1A Gene discovered through SciDEX knowledge graph analysis: