HBA1 Gene

HBA1 Gene

Overview

HBA1 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">HBA1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>HBA1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Hemoglobin Subunit Alpha 1</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>HBA-T1, alpha-globin</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>16p13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[3039](https://www.ncbi.nlm.nih.gov/gene/3039)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>[ENSG00000188536](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000188536)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[P69905](https://www.uniprot.org/uniprot/P69905)</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Hemoglobin subunit alpha</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a>, <a href="/wiki/hypertension" style="color:#ef9a9a">Hypertension</a>, <a href="/wiki/nephropathy" style="color:#ef9a9a">Nephropathy</a>, <a href="/wiki/retinopathy" style="color:#ef9a9a">Retinopathy</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">10 edges</a></td>
</tr>
</table>

HBA1 (Hemoglobin Subunit Alpha 1) encodes the alpha-globin chain of hemoglobin, the oxygen-carrying protein in red blood cells. While traditionally associated with erythrocytes, HBA1/HBA2 expression has been detected in the brain, including [neurons](/entities/neurons) and glial cells, where it may serve neuroprotective functions related to oxygen sensing, [reactive oxygen species](/entities/reactive-oxygen-species) (ROS) scavenging, and response to hypoxic stress["@biagioli2009"].

Emerging research suggests that neuronal hemoglobin expression may play protective roles in neurodegenerative diseases, particularly in conditions involving mitochondrial dysfunction and oxidative stress["@richter2017"].

Gene Information

Function

Canonical Function

HBA1 encodes the alpha chain of hemoglobin, which forms a tetramer with two alpha and two beta chains (HbA). The hemoglobin tetramer[@storz2023]:

• Binds oxygen cooperatively in the lungs
• Releases oxygen in tissues
• Transports carbon dioxide
• Buffers blood pH

Non-Erythroid/CNS Functions

Hemoglobin expression in neurons and glia may serve several functions[@schelshorn2012]:

Expression

Peripheral Expression

• Erythroid cells: Primary site of expression
• Erythroblasts: During erythropoiesis

CNS Expression[@wang2021]

• Neurons: Detected in cortical and hippocampal neurons
• [Astrocytes](/entities/astrocytes): Low-level expression
• Substantia nigra: Particularly relevant for Parkinson's disease
• Retina: Expression in retinal neurons

Disease Associations

Neurodegenerative Diseases

Alzheimer's Disease

• Decreased neuronal HBA1 expression in affected regions
• May contribute to reduced antioxidant capacity
• Possible protective role in early disease stages

Parkinson's Disease

• May protect dopaminergic neurons from oxidative stress
• Expression changes with disease progression
• Potential therapeutic target for neuroprotection

Amyotrophic Lateral Sclerosis

• Altered in spinal cord motor neurons
• May reflect adaptive response to oxidative stress
• Potential biomarker

Hemoglobinopathies

Mutations in HBA1 cause:

• Alpha-thalassemia: Reduced alpha-globin production
• HbH disease: Moderate hemolytic anemia
• Hydrops fetalis: Severe, often fatal (with HBA2 mutations)

Cerebral Implications of Hemoglobinopathies

Cerebrovascular complications in thalassemia include[@singer2016]:

• Stroke risk (both ischemic and hemorrhagic)
• Silent cerebral infarcts
• Cognitive impairment
• Iron deposition in brain

Neuroprotective Mechanisms

Antioxidant Function

Neuronal hemoglobin may provide antioxidant protection through[@fleming2018]:

• Heme-mediated free radical scavenging
• Peroxidase activity
• Protection against lipid peroxidation

Hypoxia Response

During hypoxic conditions:

• HBA1 expression may be upregulated
• Provides oxygen buffering capacity
• May protect against ischemic injury

Iron Handling

Hemoglobin may influence neuronal iron metabolism:

• Heme iron recycling
• Protection against iron-mediated oxidative damage
• Cross-talk with ferritin and other iron proteins

Related Pages

• [HBB](/genes/hbb)
• [Iron Metabolism](/mechanisms/iron-metabolism-neurodegeneration)
• [Oxidative Stress](/mechanisms/oxidative-stress-neurodegeneration)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction-neurodegeneration)

Key Publications

See Also

• [Iron Metabolism](/mechanisms/iron-metabolism-neurodegeneration)
• [Oxidative Stress](/mechanisms/oxidative-stress-neurodegeneration)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction-neurodegeneration)

External Links

• [NCBI Gene: HBA1](https://www.ncbi.nlm.nih.gov/gene/3039)
• [Ensembl: ENSG00000188536](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000188536)
• [UniProt: P69905](https://www.uniprot.org/uniprot/P69905)
• [GeneCards: HBA1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=HBA1)
• [OMIM: HBA1](https://omim.org/search?search=HBA1)
• [Allen Brain Atlas: HBA1](https://human.brain-map.org/microarray/search/show?search_term=HBA1)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving HBA1 Gene discovered through SciDEX knowledge graph analysis: