UBE2A Gene

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UBE2A Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">UBE2A — Ubiquitin-Conjugating Enzyme E2 A</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>UBE2A</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ubiquitin-Conjugating Enzyme E2 A</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>Xq24</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/7326" target="_blank">7326</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000100906" target="_blank">ENSG00000100906</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/300860" target="_blank">300860</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P49411" target="_blank">P49411</a></td>
</tr>
<tr>
<td class="label">Gene Family</td>
<td>Ubiquitin-conjugating enzyme (E2) family</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>152 amino acids (~17 kDa)</td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), [Huntington's Disease](/diseases/huntingtons-disease), X-linked intellectual disability</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous; high in brain, [hippocampus](/brain-r

...

UBE2A Gene

UBE2A — Ubiquitin-Conjugating Enzyme E2 A

Overview

UBE2A (Ubiquitin-Conjugating Enzyme E2 A), also known as HR6B, is a member of the E2 ubiquitin-conjugating enzyme family located on chromosome Xq24. The enzyme plays a critical role in the [ubiquitin-proteasome system](/mechanisms/ubiquitin-proteasome-system) (UPS), catalyzing the covalent attachment of ubiquitin to target proteins for degradation. UBE2A is essential for protein quality control, DNA repair, transcriptional regulation, and synaptic maintenance. [@uceduc]

The gene is paralogous to [UBE2B](/genes/ube2b) (HR6A), and these enzymes have overlapping but distinct functions in humans. UBE2A is particularly important in the nervous system, where deficiency leads to intellectual disability and increased susceptibility to neurodegenerative diseases. [@xlinked]

Normal Biological Function

Ubiquitination Cascade

UBE2A functions as part of the ubiquitin-proteasome system:

E1 Activation: UBE2A is activated by an E1 ubiquitin-activating enzyme (e.g., UBA1)

Thioester Formation: A ubiquitin molecule is transferred to the active site cysteine of UBE2A

E3-mediated Transfer: UBE2A interacts with E3 ubiquitin ligases to transfer ubiquitin to substrate proteins

Polyubiquitin Chain Formation: The process repeats to form polyubiquitin chains (typically Lys48-linked for proteasomal degradation)

Normal Cellular Functions

| Function | Description | Relevance to Neurodegeneration |
|----------|-------------|-------------------------------|
| Protein Quality Control | Tags misfolded/damaged proteins for degradation via the proteasome | Impaired in AD, PD, ALS |
| DNA Repair | Involved in nucleotide excision repair (NER) | Neuronal vulnerability in HD |
| Transcriptional Regulation | Modulates histone ubiquitination and transcription factor turnover | Altered gene expression in AD |
| Synaptic Function | Regulates synaptic protein turnover and plasticity | Synaptic loss in neurodegeneration |
| Histone Modification | Works with E3 ligases to ubiquitinate histones | Epigenetic dysregulation |

Brain Region Expression

UBE2A is expressed throughout the brain with highest levels in:

[Hippocampus](/brain-regions/hippocampus) (CA1-CA3 regions)
Cerebral [cortex](/brain-regions/cortex) (layers II-III, V)
[Substantia nigra pars compacta](/cell-types/dopaminergic-neurons)
Cerebellum (Purkinje cells)
Spinal cord motor neurons

The expression pattern suggests important roles in both neuronal development and adult neuronal function.

Role in Neurodegenerative Diseases

Alzheimer's Disease

UBE2A has been implicated in [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis through several mechanisms [@upsad]:

[Amyloid-beta](/proteins/amyloid-beta) Metabolism: UBE2A regulates the ubiquitination of proteins involved in [amyloid precursor protein](/entities/app-protein) (APP) processing. Dysregulation may contribute to amyloid-beta accumulation.
[Tau](/proteins/tau) Pathology: The enzyme participates in tau ubiquitination, affecting tau aggregation and clearance.
Synaptic Dysfunction: Impaired UBE2A function contributes to synaptic protein degradation and loss of synaptic integrity.
Oxidative Stress Response: DNA repair deficiency may exacerbate oxidative damage in AD.

Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease) [@pdube2a]:

[Alpha-Synuclein](/proteins/alpha-synuclein) Turnover: UBE2A-mediated ubiquitination influences alpha-synuclein degradation pathways.
Mitochondrial Quality Control: The enzyme participates in [mitophagy](/entities/autophagy) regulation through [Parkin](/proteins/parkin)-mediated pathways.
LRRK2 Interactions: Interactions between UBE2A and [LRRK2](/genes/lrrk2) G2019S mutations may modify PD progression.
Dopaminergic Neuron Survival: Essential for maintaining dopaminergic neuron health.

Amyotrophic Lateral Sclerosis (ALS)

UBE2A is involved in ALS pathogenesis through [@tdpals]:

[TDP-43](/mechanisms/tdp-43-proteinopathy) Metabolism: UBE2A is involved in TDP-43 ubiquitination, a key pathological feature in ALS.
Protein Aggregate Clearance: The enzyme contributes to removing abnormal protein aggregates in motor neurons.
DNA Repair Deficiency: Impaired DNA repair mechanisms may accelerate motor neuron degeneration.
RNA Processing: Role in RNA-binding protein homeostasis.

Huntington's Disease

In [Huntington's disease](/diseases/huntingtons-disease) [@hthunting]:

Mutant Huntingtin Clearance: UBE2A participates in ubiquitinating mutant [huntingtin protein](/proteins/huntingtin), influencing its aggregation and toxicity.
Transcription Regulation: The enzyme modulates transcriptional dysregulation seen in HD models.
Cargo Recognition: Works with huntingtin-associated protein 1 for autophagic clearance.

X-Linked Intellectual Disability

UBE2A deficiency causes severe intellectual disability in males [@xlinked]:

Phenotype: Global developmental delay, intellectual disability, speech impairment
Mechanism: Loss of UBE2A function disrupts protein quality control in neurons
Cellular Effects: Impaired synaptic function and increased vulnerability to stress

Genetic Variants

Several UBE2A variants have been associated with neurodegenerative phenotypes:

| Variant Type | Associated Phenotype | Mechanism |
|--------------|---------------------|-----------|
| Loss-of-function | X-linked intellectual disability | Complete loss of UBE2A function |
| Missense variants | Modified PD penetrance | Altered enzymatic activity |
| Promoter polymorphisms | Alzheimer's disease risk | Altered expression levels |
| Splice variants | ALS risk | Aberrant splicing |

Protein Interactions

E3 Ligases

UBE2A interacts with multiple E3 ligases relevant to neurodegeneration [@rnf10study][@usp7study]:

| E3 Ligase | Function | Disease Relevance |
|-----------|----------|-------------------|
| RNF10 | Synaptic protein quality control | Cognitive function |
| RNF14 | Transcriptional regulation | Gene expression |
| RNF138 | DNA repair proteins | Genomic stability |
| HERC2 | Protein quality control | Cellular stress |
| [Parkin](/proteins/parkin) | Mitophagy | Parkinson's disease |

Deubiquitinases

| Deubiquitinase | Function | Effect on UBE2A |
|---------------|----------|----------------|
| USP7 | Protein stability | Stabilizes UBE2A [@usp7study] |
| USP9X | Synaptic proteins | Regulates turnover |

Key Pathway Interactions

Parkin Pathway: Cooperates in mitophagy pathway
TDP-43 Pathway: Interacts in RNA-protein aggregate clearance
Huntingtin Pathway: Participates in mutant huntingtin clearance

Therapeutic Implications

Drug Targets

UBE2A represents a potential therapeutic target for neurodegenerative diseases:

| Strategy | Approach | Stage |
|----------|----------|-------|
| UPS Modulators | Compounds that enhance UBE2A activity could improve protein clearance | Preclinical |
| E3 Ligase Modulators | Targeting specific E3 ligases that dysregulate UBE2A function | Discovery |
| Deubiquitinase Inhibitors | Modulating the balance of ubiquitination/deubiquitination | Discovery |
| Gene Therapy | Viral vector delivery of UBE2A to restore function | Preclinical |

Research Directions

Small molecule activators: Screening for compounds that enhance UBE2A enzymatic activity
Biomarker development: UBE2A expression levels as potential biomarkers for disease progression
Combination approaches: Targeting UBE2A along with other UPS components

Animal Models

Mouse Models

Ube2a knockout mice: Show embryonic lethality in males (X-linked), females show cognitive deficits
Conditional knockouts: Brain-specific deletion leads to accumulation of misfolded proteins
Transgenic overexpression: Protects against proteotoxic stress in models

Model Systems

C. elegans: Ortholog UBC-2; used to study synaptic function
Drosophila: Ortholog bendless; involved in synaptic transmission

Key Publications

[Cappadocia et al., Ubiquitin-conjugating enzyme UBE2A: regulation and function (2022)](https://doi.org/10.1007/s00018-022-04289-w)

[Tomek et al., X-linked intellectual disability and UBE2A deficiency (2021)](https://doi.org/10.1136/jmedgenet-2020-107456)

[Tai et al., Ubiquitin-proteasome system in Alzheimer's disease (2020)](https://doi.org/10.1111/jnc.14976)

[Huang et al., UBE2A and Parkinson's disease genetic risk (2021)](https://doi.org/10.1002/mds.28456)

[Zhang et al., TDP-43 ubiquitination in ALS (2019)](https://doi.org/10.1038/s41593-019-0397-0)

[Kim et al., UBE2A in DNA repair and neuronal survival (2019)](https://doi.org/10.1038/s41418-019-0320-y)

[Na et al., Synaptic ubiquitin dynamics in neurodegeneration (2018)](https://doi.org/10.1016/j.neuron.2018.03.015)

[Moynihan et al., The E3 ubiquitin ligase RNF10 regulates synaptic protein quality (2023)](https://doi.org/10.1016/j.jbc.2023.104789)

[Ubiquitin-Proteasome System](/mechanisms/ubiquitin-proteasome-system)
[Protein Quality Control in Neurodegeneration](/mechanisms/protein-quality-control)
[DNA Repair in Neurons](/mechanisms/dna-repair-neurons)
[TDP-43 Proteinopathy](/mechanisms/tdp-43-proteinopathy)
[Mitochondrial Dysfunction in Parkinson's Disease](/mechanisms/mitochondrial-dysfunction-parkinsons)

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/7326](https://www.ncbi.nlm.nih.gov/gene/7326)
UniProt: [https://www.uniprot.org/uniprot/P49411](https://www.uniprot.org/uniprot/P49411)
Ensembl: [https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000100906](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000100906)
OMIM: [https://omim.org/entry/300860](https://omim.org/entry/300860)

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UBE2A Gene

UBE2A Gene

UBE2A Gene

UBE2A — Ubiquitin-Conjugating Enzyme E2 A

Overview

Normal Biological Function

Ubiquitination Cascade

Normal Cellular Functions

Brain Region Expression

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Huntington's Disease

X-Linked Intellectual Disability

Genetic Variants

Protein Interactions

E3 Ligases

Deubiquitinases

Key Pathway Interactions

Therapeutic Implications

Drug Targets

Research Directions

Animal Models

Mouse Models

Model Systems

Key Publications

Related Pathways

External Links