MS4A4E — Membrane-Spanning 4-Domains A4E

Introduction

Ms4A4E Gene Membrane Spanning 4 Domains A4E 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

flowchart TD
    MS4A4E["MS4A4E"] -->|"associated with"| Alzheimer["Alzheimer"]
    MS4A4E["MS4A4E"] -->|"interacts with"| CLU["CLU"]
    MS4A4E["MS4A4E"] -->|"interacts with"| APOE["APOE"]
    MS4A4E["MS4A4E"] -->|"interacts with"| BIN1["BIN1"]
    MS4A4E["MS4A4E"] -->|"interacts with"| CD2AP["CD2AP"]
    MS4A4E["MS4A4E"] -->|"interacts with"| TOMM40["TOMM40"]
    MS4A4E["MS4A4E"] -->|"interacts with"| NME8["NME8"]
    MS4A4E["MS4A4E"] -->|"interacts with"| PTK2B["PTK2B"]
    MS4A4E["MS4A4E"] -->|"interacts with"| MS4A6A["MS4A6A"]
    MS4A4E["MS4A4E"] -->|"interacts with"| PICALM["PICALM"]
    MS4A4E["MS4A4E"] -->|"interacts with"| GAB2["GAB2"]
    MS4A4E["MS4A4E"] -->|"interacts with"| ABCA7["ABCA7"]
    MS4A4E["MS4A4E"] -->|"interacts with"| CR1["CR1"]
    MS4A4E["MS4A4E"] -->|"associated with"| MIRNAS["MIRNAS"]
    style MS4A4E fill:#4fc3f7,stroke:#333,color:#000

MS4A4E (Membrane-Spanning 4-Domains A4E) is a gene located on chromosome 11q12.2 that encodes a member of the membrane-spanning 4-domains A (MS4A) family. MS4A4E is primarily expressed in immune cells and is implicated in Alzheimer’s disease risk through genome-wide association studies (GWAS)[^1].

MS4A4E is a member of the MS4A gene cluster on chromosome 11, which includes multiple genes involved in immune function and cell signaling. The protein is structurally related to MS4A4A, and these genes may have overlapping functions in both the brain and peripheral immune system.

Gene Family

The MS4A family includes several genes clustered on chromosome 11q12:

• MS4A1 (CD20): B cell marker and therapeutic target

• MS4A2 (FcεRIβ): IgE receptor subunit

• MS4A3: Myeloid/lymphoid differentiation

• MS4A4A/MS4A4E: Brain and immune function

MS4A4E and MS4A4A are closely related and may have redundant functions in the brain and immune system.

Normal Physiological Functions

Immune Function

MS4A4E is primarily expressed in immune cells and plays roles in immune regulation:

1. B Cell Biology: MS4A family members are involved in B cell receptor signaling and maturation^[2].

2. Mast Cell Function: MS4A2 (FcεRIβ) and related proteins regulate mast cell degranulation and allergic responses.

3. Monocyte/Macrophage Activity: The gene is expressed in myeloid cells and may regulate inflammatory responses.

Brain Expression

While MS4A4E is primarily an immune gene, recent studies detect low-level expression in:

• Microglia

• Certain neuronal populations

• Vascular cells

Alzheimer’s Disease Association

MS4A4E (along with MS4A4A) has been implicated in Alzheimer’s disease risk through GWAS studies^[1]. The genetic association suggests:

1. Immune Dysregulation: Variants in MS4A4E may alter microglial function in the brain.

2. Amyloid Processing: Some evidence suggests MS4A family members may interact with amyloid precursor protein (APP) processing.

3. Neuroinflammation: Altered immune function could contribute to chronic neuroinflammation in AD.

Genetic Evidence

• MS4A gene cluster variants show genome-wide significant association with AD risk.

• The region includes multiple linked genes (MS4A4A, MS4A4E, MS4A6A).

• Expression quantitative trait loci (eQTLs) in this region affect AD risk.

Therapeutic Implications

The MS4A gene cluster represents a potential therapeutic target for Alzheimer’s disease:

1. Immunomodulation: Modulating MS4A4E function could alter microglial responses.

2. Anti-Amyloid Strategies: Understanding MS4A-APP interactions may reveal new drug targets.

3. Biomarker Potential: MS4A4E expression levels may serve as a disease biomarker.

Key Publications

1. MS4A gene cluster and Alzheimer’s disease risk. Neurobiology of Aging, 2019.

2. MS4A family in immune cell function. Immunology Letters, 2018.

3. MS4A4A in Alzheimer’s disease microglia. Nature Aging, 2021.

Background

The study of Ms4A4E Gene Membrane Spanning 4 Domains A4E 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.

See Also

• Alzheimer’s Disease

• Amyloid Hypothesis

• Tau Pathology

• /mechanisms/app-processing

• /mechanisms/amyloid-aggregation

Brain Atlas Resources

• Allen Human Brain Atlas - MS4A4E Expression

• BrainSpan Atlas - MS4A4E Developmental Expression