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Missense exchanges in the TTBK2 gene mutated in SCA11
Ulf Edener1, Ingo Kurth, Annechristin Meiner
1Institut für Humangenetik, Universität zu Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany.
Journal of Neurology
|June 18, 2009
Summary
Genetic testing for spinocerebellar ataxias (SCAs) identified novel variations in the tau tubulin kinase 2 gene (TTBK2). However, these specific TTBK2 variations were unlikely to cause SCA11, highlighting diagnostic challenges.
Area of Science:
- Neurogenetics
- Molecular Neurology
Background:
- Spinocerebellar ataxias (SCAs) are a heterogeneous group of inherited neurological disorders primarily affecting the cerebellum.
- Autosomal dominant SCAs exhibit variable phenotypes, with 28 loci identified, including nine caused by repeat expansions.
Purpose of the Study:
- To investigate the frequency of mutations in the tau tubulin kinase 2 gene (TTBK2) associated with SCA11.
- To analyze TTBK2 gene mutations in familial ataxia cases to understand their role in disease pathogenesis.
Main Methods:
- Molecular genetic analysis involving sequencing of all coding exons of the TTBK2 gene.
- Analysis performed on 49 unrelated familial cases presenting with ataxia.
Main Results:
- Two novel missense variations in TTBK2 were identified at evolutionarily conserved amino acid positions.
- These variations were found to be unique in 98 alleles of ataxia patients and their disease-causing effect was highly improbable.
Conclusions:
- The identified TTBK2 variations are unlikely to be pathogenic for SCA11.
- This study underscores the complexities and challenges encountered in the molecular genetic diagnosis of SCA11.
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