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TOR2A Variants in Blepharospasm.

Samira Saeirad1, Mark S LeDoux1,2

  • 1University of Memphis, Memphis, Tennessee, USA.

Tremor and Other Hyperkinetic Movements (New York, N.Y.)
|December 11, 2023
PubMed
Summary
This summary is machine-generated.

Genetic analysis of the TOR2A gene in blepharospasm (BSP) patients found no highly deleterious variants. This suggests TOR2A is not a common cause of BSP or related dystonias, though its role remains unclear.

Keywords:
Sanger sequencingTOR2Ablepharospasmdystoniavariant analysis

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Blepharospasm (BSP) is a dystonia linked to genetic factors.
  • Previous studies suggested a role for TOR2A variants in BSP pathogenesis.
  • TOR2A is a homologue of TOR1A (DYT1), a known dystonia gene.

Purpose of the Study:

  • To investigate the role of TOR2A gene variants in the development of blepharospasm (BSP) and related dystonias.
  • To screen a cohort of BSP patients for deleterious TOR2A variants.
  • To assess the pathogenicity of previously identified TOR2A variants.

Main Methods:

  • Sanger sequencing was employed to screen 307 subjects with isolated BSP or BSP-plus dystonia.
  • Computational tools were used to evaluate the deleteriousness of TOR2A variants.
  • Analysis focused on coding and contiguous splice site regions of the TOR2A gene.

Main Results:

  • No highly deleterious TOR2A variants were identified in the coding or splice site regions of the 307-subject cohort.
  • The study found a low frequency of highly deleterious TOR2A variants in patients with BSP/BSP+ phenotypes.

Conclusions:

  • Highly deleterious TOR2A variants appear to be rare in patients presenting with blepharospasm (BSP) or BSP-plus dystonia.
  • The specific contribution of TOR2A to the etiology of BSP and other dystonias requires further investigation.
  • The genetic basis of blepharospasm remains complex and may involve multiple genes.