Biotin Thiamin Responsive Basal Ganglia Disease in Siblings.

Abstract

Biotin Thiamine responsive Basal Ganglia Disease (BTBGD) is a rare treatable autosomal recessive metabolic disorder caused by mutations in SLC19A3 gene. It usually presents with encephalopathy and dystonia; if not treated, can progress to quadriparesis and death. Two Indian siblings born to a consanguineous marriage presented with regression of milestones, epilepsy and dystonia. Neuroimaging showed signal changes in basal ganglia and thalami. Genetic testing showed a homozygous missense substitution p.Gly23Val (c.68G>T) in exon 2 of the SLC19A3 gene. Thus to conclude, any child who presents with neuroregression, epilepsy and dystonia in the background of basal ganglia changes on neuroimaging, a possibility of biotin thiamine responsive basal ganglia disease should be considered.