Hepatology : official journal of the American Association for the Study of Liver Diseases
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Case Reports
A novel two-nucleotide deletion in the ornithine transcarbamylase gene causing fatal hyperammonia in early pregnancy.
Ornithine transcarbamylase (OTC) deficiency shows X-linked inheritance. Typically, symptomatic females (who constitute 15%-20% of all carriers) have markedly reduced enzyme activity and show first symptoms in late infancy or early childhood. ⋯ DNA analysis revealed a novel mutation in form of the deletion of two nucleotides (T892, G893) in exon 9 of the OTC gene, leading to a frame shift and an aberrant gene product. We suggest that OTC deficiency should be suspected in any patient who presents with hyperammonia in the presence of otherwise normal liver function.