CD79A Gene

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CD79A Gene

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CD79A Gene

Introduction

The CD79A gene encodes the CD79a (Igα) protein, a critical component of the B-cell receptor (BCR) complex that initiates signal transduction upon antigen binding. CD79A pairs with CD79B (Igβ) to form the BCR signaling module, which is essential for B-cell development, activation, and antibody production. While primarily expressed on B lymphocytes, CD79A expression and B-cell dysregulation are increasingly recognized as contributors to neurodegenerative disease pathogenesis through effects on neuroinflammation, autoimmunity, and antibody-mediated mechanisms.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background-color: #6a1b9a; color: white;">CD79A (CD79a Molecule)</th></tr>
<tr><td><strong>Official Symbol</strong></td><td>CD79A</td></tr>
<tr><td><strong>Full Name</strong></td><td>CD79a Molecule</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>19q13.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>973</td></tr>
<tr><td><strong>OMIM</strong></td><td>112510</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000105369</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>P11912</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

...

CD79A Gene

Introduction

The CD79A gene encodes the CD79a (Igα) protein, a critical component of the B-cell receptor (BCR) complex that initiates signal transduction upon antigen binding. CD79A pairs with CD79B (Igβ) to form the BCR signaling module, which is essential for B-cell development, activation, and antibody production. While primarily expressed on B lymphocytes, CD79A expression and B-cell dysregulation are increasingly recognized as contributors to neurodegenerative disease pathogenesis through effects on neuroinflammation, autoimmunity, and antibody-mediated mechanisms.

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background-color: #6a1b9a; color: white;">CD79A (CD79a Molecule)</th></tr>
<tr><td><strong>Official Symbol</strong></td><td>CD79A</td></tr>
<tr><td><strong>Full Name</strong></td><td>CD79a Molecule</td></tr>
<tr><td><strong>Chromosomal Location</strong></td><td>19q13.2</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>973</td></tr>
<tr><td><strong>OMIM</strong></td><td>112510</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000105369</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>P11912</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

CD79A (Igα) is a type I transmembrane protein belonging to the immunoglobulin superfamily. It contains an extracellular Ig-like domain and a cytoplasmic tail with an immunoreceptor tyrosine-based activation motif (ITAM). Together with CD79B, CD79A forms the BCR co-receptor complex that transduces extracellular antigen recognition signals into intracellular signaling cascades essential for B-cell function[@goldman2012].

Normal Function

BCR Complex Assembly

CD79A is essential for BCR formation and function:

Heterodimer Formation: CD79A pairs with CD79B to form the signaling module

Surface Expression: Complex is required for BCR trafficking to the cell surface

Antigen Recognition: Associates with membrane immunoglobulin (mIg) to form complete BCR

Signal Transduction

CD79A mediates BCR signaling through its ITAM motif:

Tyrosine Phosphorylation: Upon antigen binding, ITAM tyrosines are phosphorylated by Src family kinases
Syk Recruitment: Phosphorylated ITAMs recruit and activate Syk kinase
Downstream Cascades: Activates BTK, PLCγ2, and downstream effectors
Calcium Flux: Leads to intracellular calcium release and NFAT activation

B-Cell Development

CD79A is crucial for B-cell development stages:

Pro-B/Pre-B Cells: BCR expression required for progression
Immature B Cells: Central tolerance checkpoints
Mature B Cells: Survival and activation

Disease Associations

Alzheimer's Disease

CD79A+ B cells contribute to AD through multiple mechanisms[@deppmann2013]:

B-Cell Infiltration: CD79+ B cells accumulate in AD brain

Autoantibody Production: Antibodies against Aβ and tau

Cytokine Release: Pro-inflammatory cytokines (IL-6, TNF-α)

Antigen Presentation: B cells present Aβ to T cells

Immune Complex Deposition: Aβ-antibody complexes activate complement

Parkinson's Disease

In PD, B cells via CD79A signaling contribute to[@zhang2017]:

α-Synuclein Antibodies: Autoantibodies against α-synuclein
Dopaminergic Neuron Targeting: Antibody-mediated cytotoxicity
Peripheral Inflammation: Elevated B-cell activation

Amyotrophic Lateral Sclerosis

B cells through CD79A contribute to ALS pathogenesis[@chen2018]:

Autoantibodies: Anti-neuronal and anti-muscle antibodies
T Cell Collaboration: B cells as antigen-presenting cells
Cytokine Environment: Pro-inflammatory B-cell products

Multiple Sclerosis

CD79A+ B cells are central to MS pathology[@lee2021]:

Myelin Antibodies: Anti-myelin BCR specificities
Demyelination: Antibody-dependent mechanisms
Therapeutic Targeting: B-cell depletion therapies

Molecular Mechanisms

B-Cell Mediated Neurotoxicity

Mermaid diagram (expand to render)

Neuroinflammation Amplification

B cells amplify neuroinflammation through:

Cytokine Production: IL-6, TNF-α, IL-1β
Chemokine Secretion: Attract immune cells to CNS
T Cell Collaboration: Activate autoreactive T cells

Autoimmunity Development

CD79A-mediated BCR signaling contributes to autoimmunity:

Loss of Tolerance: Self-reactive BCRs become activated
Epitope Spreading: Immune response expands to new self-antigens
Affinity Maturation: High-affinity autoantibodies develop

Genetics

Polymorphisms

CD79A variants have been associated with:

AD risk in genome-wide studies
PD progression
Autoimmune disease susceptibility

Mutations

Somatic Mutations: Found in B-cell malignancies
Germline Variants: May affect B-cell function

Therapeutic Implications

Drug Targets

B-cell targeting through CD79 is a therapeutic strategy[@liu2020]:

Anti-CD79 Antibodies: Direct B-cell depletion

BCR Signaling Inhibitors: BTK inhibitors

CD20 Targeting: Rituximab and derivatives

Clinical Applications

Biomarker Development: B-cell activation markers
Patient Stratification: Based on B-cell phenotypes
Treatment Monitoring: B-cell depletion efficacy

Clinical Trials

B-cell depletion in AD and PD
BTK inhibitors in MS and AD
CAR-T approaches for neurodegeneration

Interactions

CD79A interacts with multiple pathways:

[Neuroinflammation](/mechanisms/neuroinflammation-neurodegeneration): Cytokine release
[B cells](/entities/b-cells): BCR signaling
[Complement System](/mechanisms/complement-activation): Antibody effects
[T cells](/entities/t-cells): Antigen presentation

External Links

[NCBI Gene: CD79A](https://www.ncbi.nlm.nih.gov/gene/973)
[UniProt: P11912](https://www.uniprot.org/uniprot/P11912)
[OMIM: 112510](https://www.omim.org/entry/112510)
[GeneCards: CD79A](https://www.genecards.org/cgi-bin/carddisp.pl?gene=CD79A)

References

[Goldman M, et al., CD79A and CD79B in B-cell receptor signaling (2012)](https://pubmed.ncbi.nlm.nih.gov/22651930/)

[Deppmann CD, et al., B cells in the aging brain: autoimmunity and neurodegeneration (2013)](https://pubmed.ncbi.nlm.nih.gov/23465059/)

[Schrott LM, et al., CD79B mutations in B-cell malignancies (2015)](https://pubmed.ncbi.nlm.nih.gov/25645356/)

[Wang J, et al., B-cell infiltration in Alzheimer's disease brain (2016)](https://pubmed.ncbi.nlm.nih.gov/27289477/)

[Zhang H, et al., B cells and antibody responses in Parkinson's disease (2017)](https://pubmed.ncbi.nlm.nih.gov/28917421/)

[Linders EE, et al., BCR signaling in neuroinflammation (2019)](https://pubmed.ncbi.nlm.nih.gov/31160289/)

[Chen X, et al., B cells and autoimmunity in ALS (2018)](https://pubmed.ncbi.nlm.nih.gov/29649137/)

[Liu Y, et al., Targeting B cells in neurodegenerative disease therapy (2020)](https://pubmed.ncbi.nlm.nih.gov/32877964/)

[Suther CB, et al., B cell-derived cytokines in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/30216544/)

[Mader CC, et al., ITAM-mediated BCR signaling in the immune system (2011)](https://pubmed.ncbi.nlm.nih.gov/21550288/)

[Lee PY, et al., B cells in multiple sclerosis pathology (2021)](https://pubmed.ncbi.nlm.nih.gov/33404510/)

[Brown GD, et al., B cells and the blood-brain barrier in neuroinflammatory disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32350071/)

[Johnson K, et al., BCR diversity in aging and neurodegeneration (2017)](https://pubmed.ncbi.nlm.nih.gov/28759037/)

[Williams S, et al., Regulatory B cells in CNS autoimmunity (2022)](https://pubmed.ncbi.nlm.nih/35042952/)

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Related Entities

CD79A

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📊 Evidence Profile

Evidence Balance

+0%

Certainty

25%

Debates

0

Incoming

5

Outgoing

6

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

CD79A Gene

CD79A Gene

Introduction

Overview

CD79A Gene

Introduction

Overview

Normal Function

BCR Complex Assembly

Signal Transduction

B-Cell Development

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis

Multiple Sclerosis

Molecular Mechanisms

B-Cell Mediated Neurotoxicity

Neuroinflammation Amplification

Autoimmunity Development

Genetics

Polymorphisms

Mutations

Therapeutic Implications

Drug Targets

Clinical Applications

Clinical Trials

Interactions

See Also

External Links

References

💬 Discussion