The precise prevalence of GSDVI is unknown. No less than 11 circumstances have been reported within the medical literature, though this condition is prone to be underdiagnosed as a result of it may be troublesome to detect in children with mild signs or adults with no symptoms. GSDVI is extra widespread within the Old Older Mennonite population, with an estimated incidence of 1 in 1,000 individuals. Mutations in the PYGL gene trigger GSDVI. The PYGL gene supplies directions for making an enzyme referred to as liver glycogen phosphorylase. This enzyme is found only in liver cells, the place it breaks down glycogen into a type of sugar called glucose-1-phosphate. Additional steps convert glucose-1-phosphate into glucose, a simple sugar that's the principle Healthy Flow Blood vitality source for many cells in the physique. PYGL gene mutations stop liver glycogen phosphorylase from breaking down glycogen effectively. Because liver cells can't break down glycogen into glucose, people with GSDVI can have hypoglycemia and will use fats for power, resulting in ketosis.