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Abstract
Fructose-1,6-bisphosphatase (FBPase) (EC 3.1.3.11) catalyzes the splitting of fructose-1,6-bisphosphate into fructose 6-phosphate and inorganic phosphate. FBPase deficiency is an autosomal recessive inherited disorder caused by distraction of the fructose-1,6-bisphosphatase 1 gene ( FBP1) and features severely impaired gluconeogenesis. We studied a female patient with typical FBPase deficiency symptoms. The FBPase activity of her peripheral white blood cells was undetectable. Genetic analyses of FBP1 revealed her to be a compound-heterozygote of two new mutations F194S and P284R. Gene tracking in the family revealed the mother to be a heterozygote of F194S, and the father and a sister to be heterozygotes of P284R. As both Phe194 and Pro284 of FBPase are highly conserved in many species and close to crucial amino acid residues to FBPase functions, these mutations could be responsible for the loss of FBPase activities.
Published Version
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