Novel mutation causing partial biotinidase deficiency in a Syrian boy with infantile spasms and retardation.
We report a case of partial biotinidase deficiency (plasma biotinidase levels: 1.30 nm/minute/mL) in a 7-month-old boy who presented with evidence of perinatal distress followed by developmental delay, hypotonia, seizures, and infantile spasms without alopecia or dermatitis. His neurologic symptoms improved markedly on biotin supplementation and antiepileptic drug therapy. DNA mutational analysis revealed that the patient was homozygous for a novel E64K mutation and his parents were heterozygous for the same mutation. Whereas preexisting perinatal distress probably contributed to the severity of the patient's symptoms, the described mutation is novel and is possibly responsible for at least some of his clinical manifestations.
Mikati
Mohamad A
MA
Department of Pediatrics, American University of Beirut Medical Center, Lebanon. mamikati@aub.edu.lb
Zalloua
Pierre
P
Karam
Pascale
P
Habbal
Mohamad-Zuheir
MZ
Rahi
Amal C
AC
D028921:Biotinidase Deficiency / Q000150:complications / Q000235:genetics* / Q000473:pathology; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000150:complications / Q000235:genetics* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D017354:Point Mutation; D013036:Spasms, Infantile / Q000150:complications / Q000235:genetics* / Q000473:pathology; D013593:Syria