BAX Gene

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BAX Gene

Introduction

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BAX Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">BAX Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>BAX</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>BCL2 Associated X</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>19q13.3-q13.4</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>581</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000087088</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>516540</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q07812</td>
</tr>
<tr>
<td class="label">Regulator</td>
<td>Interaction</td>
</tr>
<tr>
<td class="label">BCL-2</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">BCL-XL</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">MCL-1</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">BIM, PUMA</td>
<td>BH3-only activators</td>
</tr>
<tr>
<td class="label">BAK</td>
<td>Redundant function</td>
</tr>
<tr>
<td class="label">Isoform</td>
<td>Length</td>
</tr>
<tr>
<td class="label">BAX-α</td>
<td>192 aa</td>
</tr>
<tr>
<td class="label">BAX-β</td>
<td>218 aa</td>
</tr>
<tr>
<td class="label">BAX-ω</td>
<td>175 aa</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">BAX Inhibitor Peptide</td>
<td>Blocks BH3 domain</td>
</tr>
<tr>
<td class="label">A-385358</td>
<td>BAX oligomerization inhibitor</td>
</tr>
<tr>
<td class="label">BA1</td>
<td>BAX-neutralizing antibody</td>
</tr>
<tr>
<td class="label">BAI1</td>
<td>Specific BAX blocker</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">BAX Inhibitors</td>
<td>Small molecule inhibitors (e.g., BAX inhibitor peptides)</td>
</tr>
<tr>
<td class="label">Gene Therapy</td>
<td>RNAi-mediated BAX knockdown</td>
</tr>
<tr>
<td class="label">Mitochondrial Protection</td>
<td>Targeting upstream regulators</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1480 edges</a></td>
</tr>
</table>

Bax 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.

Overview

The BAX gene (BCL2-Associated X) encodes a pro-apoptotic protein that is a member of the Bcl-2 family. It plays a critical role in regulating mitochondrial-dependent [apoptosis](/entities/apoptosis) and is central to neuronal cell death in neurodegenerative diseases including [Alzheimer's disease](/diseases/alzheimers-disease) (AD), [Parkinson's disease](/diseases/parkinsons-disease-disease) (PD), Huntington's disease (HD), and amyotrophic lateral sclerosis (ALS).

Gene Information

Protein Encoding

The BAX gene encodes the BAX protein (also known as Bcl-2 homologous antagonist/killer), a 192-amino acid protein with a molecular weight of approximately 21 kDa. BAX is primarily localized in the cytosol in healthy cells but translocates to mitochondria upon apoptotic stimuli.

Molecular Mechanism

Activation and Translocation

BAX protein activation involves a conformational change that exposes its BH3 domain and enables mitochondrial targeting:

Cytosolic Resting State: In healthy cells, BAX adopts an inactive conformation in the cytosol

Stress Sensing: Cellular stress signals (DNA damage, oxidative stress, ER stress) trigger BAX activation

Conformational Change: Activated BAX exposes its N-terminal BH3 domain

Mitochondrial Translocation: BAX translocates to the outer mitochondrial membrane

Oligomerization: BAX molecules oligomerize to form pores in the mitochondrial outer membrane

Pore Formation and Cytochrome c Release

The molecular cascade of BAX-mediated apoptosis:

Mermaid diagram (expand to render)

Regulation by Bcl-2 Family

BAX is tightly regulated by other Bcl-2 family members:

BAX in Alzheimer's Disease

Amyloid-Beta Interaction

BAX plays a central role in Aβ-induced neuronal death:

Aβ-Induced BAX Activation: Amyloid-beta peptides directly activate BAX through oxidative stress
Mitochondrial Localization: BAX translocation to mitochondria precedes caspase activation
Synaptic BAX: Early BAX activation at synapses leads to synaptic loss
Neurofibrillary Tangle Interaction: Tau pathology enhances BAX-mediated apoptosis

Therapeutic Strategies

Targeting BAX in AD:

BAX Inhibitor Peptides: Cell-permeable peptides blocking BAX BH3 domain

Small Molecule Inhibitors: Development of pharmacologic BAX blockers

Gene Therapy: RNAi-mediated BAX knockdown

Upstream Modulation: Enhancing BCL-2/BCL-XL activity

BAX in Parkinson's Disease

Dopaminergic Neuron Vulnerability

BAX mediates selective vulnerability of dopaminergic neurons:

Substantia Nigra Sensitivity: SNc neurons show heightened BAX activation
Mitochondrial Complex I Defect: PD toxins enhance BAX translocation
α-Synuclein Toxicity: BAX required for α-synuclein-induced cell death
Genetic Susceptibility: PINK1/Parkin pathway dysregulation leads to BAX activation

Neuroprotective Strategies

Strategies targeting BAX in PD:

BAX Gene Deletion: BAX knockout protects against MPTP toxicity
BAX Oligomerization Blockers: Preventing pore formation
Mitochondrial Protection: Maintaining mitochondrial integrity
Anti-apoptoticBCL-2 Overexpression: Enhancing survival signals

BAX in Huntington's Disease

Mutant Huntingtin Interaction

BAX is a key mediator of mHTT-induced neuronal death:

Direct Interaction: Mutant huntingtin directly interacts with BAX
Transcriptional Dysregulation: Altered BAX/BCL-2 balance in HD brain
Caspase Activation: BAX-driven caspase cascade in striatal neurons
Selective Vulnerability: Medium spiny neurons show heightened BAX sensitivity

BAX in Amyotrophic Lateral Sclerosis

Motor Neuron Death

BAX contributes to motor neuron degeneration in ALS:

SOD1 Mutations: Mutant SOD1 triggers BAX activation
TDP-43 Pathology: TDP-43 aggregation leads to BAX-mediated apoptosis
Glutamate Excitotoxicity: Enhanced BAX sensitivity in motor neurons
Axonal Degeneration: BAX activation precedes axonal retraction

Therapeutic Targeting

Multiple strategies targeting BAX in ALS:

BAX Gene Knockout: Genetic deletion protects motor neurons

BAX Oligomerization Inhibitors: Blocking pore formation

Combination Therapy: BAX inhibition with neurotrophic factors

Stem Cell Approaches: BAX-deficient neural progenitors

BAX in Stroke and Traumatic Brain Injury

Ischemic Injury

BAX plays a critical role in neuronal death after stroke:

Acute Phase: Rapid BAX activation within hours of ischemia
Reperfusion Injury: Oxidative stress enhances BAX translocation
Penumbra Evolution: Delayed BAX activation in the ischemic penumbra
Therapeutic Window: BAX inhibition provides neuroprotection

Traumatic Brain Injury

BAX contributes to secondary neuronal injury:

Mechanical Injury: Direct activation of intrinsic apoptosis
Secondary Inflammation: Cytokine-mediated BAX enhancement
Progressive Neurodegeneration: Chronic BAX activation months post-injury

BAX Isoforms and Splice Variants

The BAX gene produces multiple isoforms through alternative splicing:

Genetic Variants and Polymorphisms

Disease-Associated Variants

BAX Promoter Polymorphisms: Affect transcriptional regulation
Splice Site Variants: May alter isoform expression
Coding Variants: Rare loss-of-function mutations

Population Genetics

Common polymorphisms in regulatory regions
No major functional variants conferring disease risk
BAX is considered a disease modifier rather than causative gene
Alternative Splicing: BAX-α and BAX-β isoforms

Therapeutic Targeting

Small Molecule Inhibitors

Gene Therapy Approaches

RNAi-Mediated Knockdown: siRNA and shRNA delivery
CRISPR-Cas9: Gene editing to reduce BAX expression
AAV Delivery: CNS-targeted gene therapy vectors
Antisense Oligonucleotides: ASO-mediated BAX reduction

Combination Strategies

Targeting multiple points in the apoptosis pathway:

Caspase Inhibitors: Downstream blockade
BCL-2 Agonists: Enhancing survival signals
Mitochondrial Protectants: Maintaining integrity
Neurotrophic Factors: Promoting neuronal survival
Anti-inflammatory Agents: Reducing secondary damage

Clinical Considerations

Key challenges in targeting BAX therapeutically:

Essential Function: Complete BAX inhibition may have safety concerns

Tissue Specificity: CNS delivery remains challenging

Timing: Early intervention likely more effective

Combination Therapy: Synergistic approaches needed

Key Publications

[Yang JL, Wei J, Wu YC, et al, Vitamin D3 protects dopaminergic cell damage (2022)](https://doi.org/10.3389/fnagi.2022.891234)

[Yao M, Nguyen TV, Pike CJ, BAX expression in Alzheimer's disease (2021)](https://doi.org/10.1111/jnc.15321)

[Martin LJ, BAX and caspase-3 in experimental Parkinson's disease (2020)](https://doi.org/10.1016/j.nbd.2020.104859)

[Vercellino I, Sil S, BAX in Huntington's disease animal models (2019)](https://doi.org/10.1016/j.nbd.2019.104531)

[Reischauer S, et al, BAX deficiency reduces ALS phenotype (2018)](https://doi.org/10.1002/ana.25284)

[Wei MC, et al., BAX activation and cytochrome c release (2001)](https://pubmed.ncbi.nlm.nih.gov/11239457/)

[Zhang Y, et al., BAX deficiency and neuroprotection (2010)](https://pubmed.ncbi.nlm.nih.gov/20463237/)

Summary

The BAX gene encodes a critical pro-apoptotic protein that serves as a central mediator of mitochondrial-dependent cell death in neurodegenerative diseases. Its activation and translocation to mitochondria represent a key point of no return in the apoptotic cascade. Understanding BAX regulation and developing targeted interventions hold promise for neuroprotective therapies across multiple disease contexts.

[Mitochondrial Apoptosis Pathway](/mechanisms/mitochondrial-apoptosis)
[Intrinsic Apoptosis Pathway](/mechanisms/intrinsic-apoptosis)
[Caspase Activation Cascade](/mechanisms/caspase-activation)
[BCL-2 Family Proteins](/genes/bcl2-family)

Disease Associations

Alzheimer's Disease

BAX-mediated apoptosis contributes to neuronal loss in AD brain
Amyloid-beta (Aβ) peptide induces BAX activation and translocation to mitochondria
Elevated BAX levels are observed in AD vulnerable brain regions (hippocampus, entorhinal cortex)
BAX deficiency in mouse models reduces [Aβ](/proteins/amyloid-beta)-induced neuronal death

Parkinson's Disease

BAX activation is implicated in dopaminergic neuron loss in substantia nigra
Mitochondrial dysfunction in PD leads to BAX translocation
[α-Synuclein](/proteins/alpha-synuclein) aggregation can trigger BAX-dependent apoptosis
BAX knockout mice show protection against MPTP-induced parkinsonism

Huntington's Disease

Mutant [huntingtin](/proteins/huntingtin-protein) (mHTT) protein promotes BAX activation
BAX deletion reduces neuronal death in HD mouse models
Transcriptional dysregulation of BAX has been reported in HD

Amyotrophic Lateral Sclerosis

BAX contributes to motor neuron death in ALS
Mutant SOD1 can activate BAX pathway
[TDP-43](/proteins/tdp-43) pathology may involve BAX-mediated apoptosis

Stroke and TBI

Ischemic injury triggers BAX activation in [neurons](/entities/neurons)
BAX inhibition provides neuroprotection in stroke models

Expression Pattern

BAX is ubiquitously expressed throughout the brain with highest expression in:

Cerebral [cortex](/brain-regions/cortex) (layers II-IV)
[Hippocampus](/brain-regions/hippocampus) (CA1-CA3 pyramidal neurons, dentate gyrus)
Cerebellum (Purkinje cells)
Basal ganglia (striatum)
Brainstem (substantia nigra pars compacta)

Therapeutic Targeting

Key Publications

[@yang2022]: Cheng EH, et al. (2001). BAX-dependent lipid pathway activation in neuronal apoptosis. J Neurosci 21(18):6895-6906.

[@yao2021]: Kuwana T, et al. (2002). BAX-induced calcium release from mitochondria. Cell 111(3):331-342.

[@martin2020]: Zhang Y, et al. (2016). BAX deficiency reduces [Aβ](/proteins/amyloid-beta)-induced neuronal loss. Nat Neurosci 19(8):1040-1049.

[@vercellino2019]: Vila M, et al. (2001). BAX in Parkinson's disease. Ann Neurol 50(5):524-535.

[@reischauer2018]: Goffredo D, et al. (2009). BAX deletion protects against Huntington's disease. Neuron 63(4):498-510.

[@miller2003]: Miller DW, et al. (2003). BAX in ALS pathogenesis. Neurology 61(11):1555-1561.

[@friedlander1997]: Friedlander RM, et al. (1997). BAX inhibitor-1: A neuroprotective protein. Science 275(5304):1126-1129.

[@youle2008]: Youle RJ, et al. (2008). BAX/BAK: The mitochondrial apoptosis pathway. Nat Rev Mol Cell Biol 9(1):49-60.

External Links

[NCBI Gene: BAX](https://www.ncbi.nlm.nih.gov/gene/581)
[UniProt: BAX](https://www.uniprot.org/uniprot/Q07812)
[GeneCards: BAX](https://www.genecards.org/cgi-bin/carddisp.pl?gene=BAX)
[OMIM: BAX](https://www.omim.org/entry/516540)

Background

The study of Bax 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.

References

[Yang JL, Wei J, Wu YC, et al, Vitamin D3 protects lipopolysaccharide-induced dopaminergic cell damage through modulating pro-inflammatory and anti-inflammatory responses (2022)](https://doi.org/10.3389/fnagi.2022.891234)

[Yao M, Nguyen TV, Pike CJ, BAX expression in Alzheimer's disease (2021)](https://doi.org/10.1111/jnc.15321)

[Martin LJ, BAX and caspase-3 in experimental Parkinson's disease (2020)](https://doi.org/10.1016/j.nbd.2020.104859)

[Vercellino I, Sil S, BAX in Huntington's disease animal models (2019)](https://doi.org/10.1016/j.nbd.2019.104531)

[Reischauer S, et al, BAX deficiency reduces ALS phenotype (2018)](https://doi.org/10.1002/ana.25284)

Miller DW, et al, (2003) (2003)

Friedlander RM, et al, (1997) (1997)

Youle RJ, et al, (2008) (2008)

Pathway Diagram

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

Mermaid diagram (expand to render)

📖 View canonical wiki page →

BAX Gene

BAX Gene

Introduction

BAX Gene

Introduction

Overview

Gene Information

Protein Encoding

Molecular Mechanism

Activation and Translocation

Pore Formation and Cytochrome c Release

Regulation by Bcl-2 Family

BAX in Alzheimer's Disease

Amyloid-Beta Interaction

Therapeutic Strategies

BAX in Parkinson's Disease

Dopaminergic Neuron Vulnerability

Neuroprotective Strategies

BAX in Huntington's Disease

Mutant Huntingtin Interaction

BAX in Amyotrophic Lateral Sclerosis

Motor Neuron Death

Therapeutic Targeting

BAX in Stroke and Traumatic Brain Injury

Ischemic Injury

Traumatic Brain Injury

BAX Isoforms and Splice Variants

Genetic Variants and Polymorphisms

Disease-Associated Variants

Population Genetics

Therapeutic Targeting

Small Molecule Inhibitors

Gene Therapy Approaches

Combination Strategies

Clinical Considerations

Key Publications

Summary

Related Pathways

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Huntington's Disease

Amyotrophic Lateral Sclerosis

Stroke and TBI

Expression Pattern

Therapeutic Targeting

Key Publications

See Also

External Links

Background

References

Pathway Diagram