TUBB2B Mutation in an Adult Patient with Myoclonus-Dystonia

Joshua T. Geiger, Alice B. Schindler, Cornelis Blauwendraat, Harvey S. Singer, Sonja W. Scholz

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Tubulin mutations are a cause of neuronal migrational disorders referred to as tubulinopathies. Mutations in tubulin genes can have a severe impact on microtubule function and result in heterogeneous clinical presentations. Current understanding of the clinical spectrum of tubulinopathies is predominantly based on research in fetal tissue and early-childhood cases. Methods: Testing of candidate genes followed by whole-exome sequencing was performed in an adult woman with a neurodevelopmental, hyperkinetic movement disorder, to identify the underlying genetic cause. Bioinformatic modeling and a systematic review of literature was conducted to investigate genotype-phenotype correlations. Results: The patient was found to carry a heterozygous, de novo c.722G>A, p.R241H mutation in a conserved domain of TUBB2B, encoding the β-isoform of tubulin. In silico analysis indicated that this mutation was pathogenic. On neuroimaging, the patient had asymmetric pachygyria and dysmorphic basal ganglia. Her neurological examination demonstrated mild cognitive impairment, myoclonus-dystonia, and skeletal anomalies. Conclusions: Here, we report the unique phenotype of an adult TUBB2B mutation carrier. This case illustrates a relatively mild phenotype compared to previously described fetal and early childhood cases. This highlights the importance of obtaining molecular genetic testing in individuals with a high probability of a genetic disease, including undiagnosed adult patients.

Original languageEnglish (US)
Pages (from-to)216-221
Number of pages6
JournalCase Reports in Neurology
Volume9
Issue number2
DOIs
StatePublished - Aug 31 2017

Keywords

  • Dystonia
  • Genetic testing
  • Genotype-phenotype correlation
  • Myoclonus
  • Neuronal migration disorder
  • TUBB2B
  • Tubulinopathy

ASJC Scopus subject areas

  • Clinical Neurology

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