MAP1S - Microtubule Associated Protein 1S

MAP1S - Microtubule Associated Protein 1S

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MAP1S - Microtubule Associated Protein 1S</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>MAP1S</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Microtubule Associated Protein 1S</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>19p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[55130](https://www.ncbi.nlm.nih.gov/gene/55130)</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>[607358](https://www.omim.org/entry/607358)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000131370</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9Y2R9](https://www.uniprot.org/uniprot/Q9Y2R9)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntington-disease), [Neurodegeneration](/diseases/neurodegeneration), [Liver Disease](/diseases/liver-disease), [Cancer](/diseases/cancer)</td>
</tr>
</table>

Map1S Microtubule Associated Protein 1S is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@microtubuleassociated2014]

Overview

MAP1S - Microtubule Associated Protein 1S

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MAP1S - Microtubule Associated Protein 1S</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>MAP1S</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Microtubule Associated Protein 1S</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>19p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[55130](https://www.ncbi.nlm.nih.gov/gene/55130)</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>[607358](https://www.omim.org/entry/607358)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000131370</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q9Y2R9](https://www.uniprot.org/uniprot/Q9Y2R9)</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntington-disease), [Neurodegeneration](/diseases/neurodegeneration), [Liver Disease](/diseases/liver-disease), [Cancer](/diseases/cancer)</td>
</tr>
</table>

Map1S Microtubule Associated Protein 1S is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

[@microtubuleassociated2014]

Overview

MAP1S (Microtubule Associated Protein 1S), also known as MAP1A/MAP1S, is a member of the microtubule-associated protein family that plays crucial roles in linking microtubules to cellular organelles and facilitating intracellular transport. Unlike other MAP family members, MAP1S has unique functions in [autophagy](/entities/autophagy) regulation, connecting the microtubule cytoskeleton to autophagic processes. MAP1S interacts with LC3 (microtubule-associated protein 1A/1B light chain 3), a key protein in autophagy, and is essential for autophagosome formation, cargo recognition, and transport along microtubules.

Molecular Function

Microtubule Binding

MAP1S binds to microtubules through:

• LC3 interaction domain: Direct binding to LC3 on autophagosomes
• Microtubule-binding repeats: Multiple repeats that stabilize microtubules
• Phosphorylation regulation: Activity modulated by phosphorylation

Autophagy Regulation

MAP1S is a key regulator of autophagy:

• Autophagosome formation: Recruits LC3 and cargo to forming autophagosomes
• Cargo recognition: Links ubiquitinated cargo to autophagic machinery
• Autophagosome transport: Facilitates movement along microtubules to lysosomes

Protein Complex Formation

MAP1S forms complexes with:

• LC3/GABARAP family: Core autophagy proteins
• p62/SQSTM1: Selective autophagy receptor
• Dynein-dynactin complex: Retrograde transport of autophagosomes

Cellular Functions

Autophagy

MAP1S plays multiple roles in autophagy:

Autophagosome Biogenesis

• Initiates autophagosome formation by recruiting LC3
• Links cargo to nascent autophagosomes
• Facilitates membrane recruitment

Selective Autophagy

• Recognizes ubiquitinated protein aggregates
• Links damaged organelles to autophagosomes
• Mediates aggrephagy and mitophagy

Autophagosome-Lysosome Fusion

• Transports autophagosomes toward lysosomes
• Coordinates fusion events
• Ensures proper degradation

Microtubule Stability

MAP1S stabilizes microtubules:

• Prevents depolymerization
• Enhances microtubule bundling
• Regulates microtubule dynamics

Intracellular Transport

MAP1S facilitates transport of:

• Autophagosomes
• Endosomes
• Lysosomes
• Protein aggregates

Disease Associations

Alzheimer's Disease

MAP1S dysfunction may contribute to AD:

• Impaired autophagy: Reduced clearance of [amyloid-beta](/proteins/amyloid-beta) and [tau](/proteins/tau) aggregates
• Aggregate accumulation: Defective autophagosome transport
• Neuronal vulnerability: Age-related decline in MAP1S function

Parkinson's Disease

In PD, MAP1S is relevant to:

• [Alpha-synuclein](/proteins/alpha-synuclein) clearance: Autophagy-mediated degradation
• Mitophagy: Removal of damaged mitochondria
• Protein aggregate handling: Transport and degradation

Huntington's Disease

MAP1S contributes to HD pathogenesis:

• Mutant [huntingtin](/proteins/huntingtin) clearance: Autophagic degradation
• Aggregate transport: Movement of huntingtin aggregates
• Neuronal dysfunction: Transport deficits

Cancer

MAP1S has complex roles in cancer:

• Tumor suppression: Loss may promote tumor growth
• Autophagy regulation: Context-dependent effects
• Metastasis: Potential role in cell migration

Expression Pattern

MAP1S exhibits broad expression:

• Brain: Neuronal expression in [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), cerebellum
• Liver: High hepatic expression
• Lung: Moderate expression
• Testis: Testicular expression
• Cell types: Both neuronal and non-neuronal cells

Therapeutic Implications

Drug Target Potential

MAP1S represents a therapeutic target for:

• Neurodegenerative diseases: Enhancing autophagy function
• Cancer: Modulating autophagy in tumor cells
• Metabolic disorders: Autophagy regulation

Research Directions

• Developing autophagy enhancers targeting MAP1S
• Understanding tissue-specific functions
• Exploring gene therapy approaches

See Also

• [Microtubule-associated proteins](/proteins/microtubule-associated-proteins)
• [LC3](/proteins/lc3-protein)
• [Autophagy](/mechanisms/autophagy)
• [Mitophagy](/mechanisms/mitophagy)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Huntington's Disease](/diseases/huntington-disease)

Background

The study of Map1S Microtubule Associated Protein 1S 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