THRA (thyroid hormone receptor alpha)
The THRA gene encodes thyroid hormone receptor alpha, a key member of the nuclear receptor superfamily that functions as a ligand-activated transcription factor to regulate gene expression in response to thyroid hormones. This receptor belongs to the thyroid hormone receptor (THR) family, which also includes the THRB subtype, and both share conserved structural domains, specifically a DNA-binding domain (DBD) and a ligand-binding domain (LBD), that enable them to bind thyroid hormone response elements (TREs) on DNA. While THRA and THRB exhibit functional redundancy in certain metabolic processes, THRA is particularly critical for the development and homeostasis of the heart, skeletal muscle, brain, and bone, tissues where it is highly expressed. The THRA gene produces two distinct isoforms: TRα1, the functional receptor that binds triiodothyronine (T3) and thyroxine (T4), and TRα2, a non-functional variant that cannot bind hormone but acts as a dominant-negative regulator. Upon ligand binding, TRα1 undergoes a conformational change that facilitates dimerization and high-affinity binding to TREs, thereby modulating the transcription of target genes involved in cell proliferation, differentiation, and energy metabolism, such as MYH7 and DIO2. Disruptions in THRA function, such as the p.A263V mutation which impairs hormone binding, lead to thyroid hormone resistance syndrome alpha (RTHα), a condition characterized by growth retardation, skeletal abnormalities, and gastrointestinal issues like constipation. Furthermore, the precise expression levels of THRA are vital for cardiovascular health; overexpression of TRα1 can suppress TSH secretion and induce tachycardia resembling hyperthyroidism, whereas insufficient expression results in decreased myocardial contractility. Beyond endocrine and cardiac functions, THRA is implicated in neurodegenerative processes, as reduced expression may compromise neuronal survival and contribute to the pathogenesis of Alzheimer’s disease, highlighting its broad role in maintaining tissue-specific developmental and metabolic homeostasis.
Gene Ontology
Subcellular localization of THRA (and its protein):
- plasma membrane
- cytoplasm
- extracellular
- golgi
- vesicle
- cytoskeleton
- endoplasmic reticulum
- nucleus
- endosome
- lysosome
- mitochondrion
Gene Ontology (GO) terms for THRA:
| Interacting Gene | Interaction | Source/Score |
| Name |
|---|
| 4080 Neuroactive ligand-receptor interaction [PATH:hsa04080] |
| 4919 Thyroid hormone signaling pathway [PATH:hsa04919] |
| Name |
|---|
| Gene Expression |
| Generic Transcription Pathway |
| Nuclear Receptor transcription pathway |
| Disease | Score | NofPmids | NofSnps | Source |
| HYPOTHYROIDISM, CONGENITAL, NONGOITROUS, 6 | 0.24 | 2 | 2 | CLINVAR_UNIPROT |
| Endometriosis | 0.12 | 1 | 0 | CTD_human |
| Diaphragmatic Hernia | 0.12 | 1 | 0 | CTD_human |
| Left Ventricular Hypertrophy | 0.08 | 1 | 0 | RGD |
| Alzheimer's Disease | 0.007101096 | 3 | 0 | GAD |
| Thyroid Neoplasm | 0.005362824 | 2 | 0 | BeFree_GAD_LHGDN |
| Thyroid carcinoma | 0.003724241 | 5 | 0 | BeFree_GAD |
| Liver carcinoma | 0.002995792 | 2 | 0 | BeFree_LHGDN |
| Mammary Neoplasms | 0.00272435 | 1 | 0 | LHGDN |
| Adenoma | 0.00272435 | 1 | 0 | LHGDN |
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