| Property | Value | [@klein1999] |----------|-------| [@goodchild2011] | Gene Symbol | DYT1 / TOR1A | | Full Name | Torsin Family 1 Member A | | Chromosomal Location | 9q34.2 | | NCBI Gene ID | 1896 | | OMIM ID | 605204 | | Ensembl ID | ENSG00000136827 | | UniProt ID | Q9UHD8 | | Encoded Protein | Torsin-1A | | Associated Diseases | Early-Onset Generalized Dystonia (DYT1), Early-Onset Paroxysmal Dyskinesia |
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Overview
DYT1 (also known as TOR1A) is a gene that encodes torsin-1A, an AAA+ ATPase family protein primarily localized to the endoplasmic reticulum and nuclear envelope. Mutations in DYT1 cause early-onset generalized dystonia (DYT1 dystonia), the most common form of inherited dystonia. The primary pathogenic mutation is a ΔE302/303 deletion in the torsin-1A protein, which results in loss of ATPase function and impaired ER protein quality control. DYT1 is expressed throughout the brain, with highest expression in the basal ganglia, cerebellum, and [cortex](/brain-regions/cortex). The gene follows an autosomal dominant inheritance pattern with reduced penetrance (~30%).
Function
DYT1 (also known as TOR1A) encodes torsin-1A, an AAA+ ATPase family member located primarily in the endoplasmic reticulum and nuclear envelope. Torsin-1A is involved in multiple cellular processes critical to neuronal function.
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DYT1 (Torsin A)
<div class="infobox infobox-gene">
| Property | Value | [@klein1999] |----------|-------| [@goodchild2011] | Gene Symbol | DYT1 / TOR1A | | Full Name | Torsin Family 1 Member A | | Chromosomal Location | 9q34.2 | | NCBI Gene ID | 1896 | | OMIM ID | 605204 | | Ensembl ID | ENSG00000136827 | | UniProt ID | Q9UHD8 | | Encoded Protein | Torsin-1A | | Associated Diseases | Early-Onset Generalized Dystonia (DYT1), Early-Onset Paroxysmal Dyskinesia |
</div>
Overview
DYT1 (also known as TOR1A) is a gene that encodes torsin-1A, an AAA+ ATPase family protein primarily localized to the endoplasmic reticulum and nuclear envelope. Mutations in DYT1 cause early-onset generalized dystonia (DYT1 dystonia), the most common form of inherited dystonia. The primary pathogenic mutation is a ΔE302/303 deletion in the torsin-1A protein, which results in loss of ATPase function and impaired ER protein quality control. DYT1 is expressed throughout the brain, with highest expression in the basal ganglia, cerebellum, and [cortex](/brain-regions/cortex). The gene follows an autosomal dominant inheritance pattern with reduced penetrance (~30%).
Function
DYT1 (also known as TOR1A) encodes torsin-1A, an AAA+ ATPase family member located primarily in the endoplasmic reticulum and nuclear envelope. Torsin-1A is involved in multiple cellular processes critical to neuronal function.
Key normal physiological functions include:
ER dynamics and nuclear envelope integrity - Regulates ER shape and nuclear envelope membrane curvature
Neurotransmitter release - Modulates dopamine release in the striatum
Cytoskeletal organization - Interacts with the actin cytoskeleton
Protein quality control - Involved in ER-associated degradation (ERAD)
Axonal transport - Regulates microtubule-based vesicle trafficking
Synaptic vesicle cycling - Important for synaptic vesicle recycling
Disease Associations
Early-Onset Generalized Dystonia (DYT1)
The most common form of inherited dystonia, characterized by involuntary muscle contractions leading to twisting postures:
Inheritance - Autosomal dominant with reduced penetrance (~30%)
Age of onset - Typically childhood (1-28 years, median 12)
Initial symptoms - Focal dystonia (often leg or foot) progressing to generalized
Penetrance - ~30% of carriers develop symptoms
Primary mutation: ΔE302/303 (glutamic acid deletion) in torsin-1A
Pathogenic mechanisms:
Loss of function - Mutant torsin-1A has reduced ATPase activity
ER stress - Impairs ER protein processing and quality control