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Implantation of Osmotic Pumps and Induction of Stress to Establish a Symptomatic, Pharmacological Mouse Model for DYT/PARK-ATP1A3 Dystonia
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Classical homocystinuria presenting with transient basal ganglia pathology and dystonia

Luisa Averdunk1, Eva Thimm1, Dirk Klee2

  • 1Department of General Pediatrics and Neonatology, University Children's Hospital, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany.

Journal of Inherited Metabolic Disease
|September 17, 2023
PubMed

Insights

Classical homocystinuria, a genetic disorder, can cause dystonia. Prompt vitamin B6 treatment normalized homocysteine levels and improved neurological symptoms in a child, highlighting homocystinuria as a treatable cause of dystonia.

Area of Science:

  • Biochemistry
  • Genetics
  • Neurology

Background:

  • Classical homocystinuria results from CBS gene variants, causing cystathionine beta-synthase deficiency.
  • This condition leads to elevated homocysteine levels and diverse clinical manifestations, including developmental delay, psychiatric issues, thromboembolism, lens dislocation, and marfanoid habitus.

Purpose of the Study:

  • To report a case of classical homocystinuria presenting atypically with dystonia and basal ganglia abnormalities.
  • To emphasize homocystinuria as a treatable differential diagnosis for movement disorders.

Main Methods:

  • Clinical case presentation.
  • Biochemical analysis of homocysteine levels.
  • Neuroimaging studies (brain MRI).
  • Therapeutic intervention with vitamin B6.

Main Results:

  • The patient exhibited acute dystonia and symmetrical basal ganglia abnormalities, mimicking mitochondrial disease.
  • Vitamin B6 treatment normalized homocysteine levels and resolved dystonic episodes.
  • Neuroimaging abnormalities significantly improved after treatment.

Conclusions:

  • Homocystinuria should be considered in the differential diagnosis of unexplained dystonia, especially when basal ganglia abnormalities are present.
  • Early diagnosis and treatment with vitamin B6 can lead to favorable neurological outcomes.

Keywords:
basal gangliacentral tegmental tractcorpus callosumdystoniavitamin B6

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