| Summary: | Abstract Introduction Fructose‐1,6‐bisphosphatase (FBPase) deficiency is a rare inherited disorder in gluconeogenesis, characterized by hypoglycemia, ketonuria, metabolic acidosis and convulsions. Case presentation We describe two brothers with FBPase deficiency. The proband developed s evere hypoglycemia and progressed to status epilepticus, and the brother showed slightly hypoglycemia with a good prognosis. Whole exome sequencing (WES) identified compound heterozygous variants [c.333+1_333+2delinsTC and c.490G>A (p.Gly164Ser)] in fructose‐1,6‐bisphosphatase 1 gene in the two brothers, which were inherited from the father and the mother, respectively. Conclusion Genetic analysis provided a solid basis for a definite diagnosis and the determination of precision therapies for the patient.
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