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Thiamine metabolism dysfunction syndrome type 2, caused by an SLC19A3 gene defect, presents varied symptoms triggered by stressors. Early diagnosis via free thiamine levels and genetic testing, followed by lifelong thiamine and biotin treatment, is crucial.

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Area of Science:

  • Genetics
  • Neurology
  • Metabolic Disorders

Background:

  • Thiamine metabolism dysfunction syndrome type 2, also known as biotin-responsive basal ganglia disease (BBGD), stems from defects in the SLC19A3 gene.
  • Its global incidence and prevalence remain unknown, with a notable concentration of reported cases in Saudi Arabia.

Purpose of the Study:

  • To review all reported cases of SLC19A3 gene defects.
  • To discuss the disorder's history, epidemiology, metabolic pathways, clinical phenotypes, and diagnosis.
  • To highlight treatment strategies and recommend an international registry for further research.

Main Methods:

  • Comprehensive review of all reported cases of SLC19A3 gene defects.
  • Analysis of clinical presentations, biochemical abnormalities, and brain pathology.
  • Evaluation of diagnostic methods, including molecular testing and potential biomarkers like free thiamine.

Main Results:

  • The syndrome exhibits heterogeneous clinical presentations, classified into childhood BBGD, early-infantile Leigh-like syndrome, and adult Wernicke-like encephalopathy.
  • Symptoms are often triggered by stressors like fever or trauma, affecting brain areas such as the basal ganglia and thalamus.
  • Molecular testing for SLC19A3 gene defects confirms diagnosis, with treatment involving lifelong thiamine and biotin supplementation.

Conclusions:

  • Early identification and intervention are critical for managing this devastating neurological disorder.
  • Free thiamine may serve as a valuable biomarker for diagnosis and treatment monitoring.
  • Establishing an international registry is recommended to advance research and address unanswered questions regarding SLC19A3 gene syndromes.