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Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models
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Identification and functional analysis of novel THAP1 mutations.

Katja Lohmann1, Nils Uflacker, Alev Erogullari

  • 1Section of Clinical and Molecular Neurogenetics, Department of Neurology, University of Lübeck, Lübeck, Germany. katja.lohmann@neuro.uni-luebeck.de

European Journal of Human Genetics : EJHG
|August 18, 2011
PubMed
Summary

THAP1 gene mutations are rare in dystonia patients, with six novel pathogenic variants identified. Functional analysis is crucial for distinguishing disease-causing mutations from benign variants in dystonia diagnosis.

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Area of Science:

  • Genetics
  • Neurology
  • Molecular Biology

Background:

  • Mutations in the THAP1 gene are linked to dystonia 6 (DYT6).
  • THAP1 encodes a transcription factor that regulates DYT1 expression.
  • Understanding THAP1's role is crucial for diagnosing and potentially treating dystonia.

Purpose of the Study:

  • To investigate the spectrum of THAP1 mutations in patients with dystonia.
  • To correlate identified THAP1 variants with clinical phenotypes.
  • To assess the pathogenicity of novel THAP1 variants.

Main Methods:

  • Sequencing of the THAP1 gene in 567 dystonia patients.
  • In silico prediction tools and luciferase reporter gene assays for variant functional analysis.
  • Subcellular localization studies for assessing mutation impact.

Main Results:

  • Ten novel THAP1 variants were identified, with six deemed pathogenic.
  • Pathogenic mutations were associated with early-onset dystonia, often starting in the neck or arm.
  • Three patients experienced generalized dystonia, two had segmental dystonia, and speech was affected in four carriers.
  • The Ile80Val substitution was classified as benign, while Asp191Thrfs*9 indicated disturbed nuclear import.

Conclusions:

  • THAP1 mutations are infrequent in unselected dystonia cohorts.
  • Distinguishing pathogenic THAP1 variants from benign ones requires functional assessments.
  • This study expands the known spectrum of THAP1 mutations and their associated phenotypes.