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European Journal of Pediatrics 2019-Nov

Glycogen storage disease type VI: clinical course and molecular background.

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Tim Aeppli
Daisy Rymen
Gabriella Allegri
Peter Bode
Johannes Häberle

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概要

Glycogen storage disease type VI (GSD-VI; also known as Hers disease, liver phosphorylase deficiency) is caused by mutations in the gene coding for glycogen phosphorylase (PYGL) leading to a defect in the degradation of glycogen. Since there are only about 40 patients described in literature, our knowledge about the course of the disease is limited. In order to evaluate the long-term outcome of patients with GSD-VI, an observational retrospective case study of six patients was performed at the University Children's Hospital Zurich. The introduction of small, frequent meals as well as cornstarch has led to normal growth in all patients and to normalization of liver transaminases in most patients. After starting the dietary regimen, there were no signs of hypoglycemia. However, three of six patients showed persistent elevation of triglycerides. Further, we identified four novel pathogenic PYGL mutations and describe here their highly variable impact on phosphorylase function.Conclusions: After establishing the diagnosis, dietary treatment led to metabolic stability and to prevention of hypoglycemia. Molecular genetics added important information for the understanding of the clinical variability in this disease. While outcome was overall excellent in all patients, half of the patients showed persistent hypertriglyceridemia even after initiating treatment.What is Known:• Glycogen storage disease type VI (GSD-VI) is a metabolic disorder causing a defect in glycogen degradation. Dietary treatment normally leads to metabolic stability and prevention of hypoglycemia.• However, our knowledge about the natural course of patients with GSD-VI is limited.What is New:• While outcome was overall excellent in all patients, half of the patients showed persistent hypertriglyceridemia even after initiating treatment.• Molecular genetics added important information for the understanding of the clinical variability in this disease.

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