Genetics of Glycogen-Storage Disease Type VI Follow-up
- Author: Lynne Ierardi-Curto, MD, PhD; Chief Editor: Bruce Buehler, MD more...
Further Outpatient Care
Perform follow-up evaluation to assess physical growth and to prevent hypoglycemic episodes by adjusting diet, as needed.
Deterrence/Prevention
Instruct patients who exhibit episodes of fasting hypoglycemia to avoid prolonged fasts exceeding 5-7 hours. During an acute illness with decreased oral intake, maintain normoglycemia with intravenous infusion of glucose-containing solution.
Prognosis
Patients have an excellent prognosis for normal stature and development, even without dietary management during childhood. Most patients exhibit resolution of hepatomegaly, hypotonia, muscle weakness, risk of fasting hypoglycemia, and abnormal biochemical parameters before or at puberty. The overall prognosis of rare variants with associated muscle or cardiac involvement depends on the severity of organ dysfunction.
Patient Education
Educate patients and parents about proper diet management and fasting avoidance techniques. Parents and primary physicians of an affected child with episodes of fasting hypoglycemia should know how to administer intravenous glucose solutions during periods of acute illness with decreased oral intake.
Chen ST, Chen HL, Ni YH, et al. X-linked liver glycogenosis in a Taiwanese family: transmission from undiagnosed males. Pediatr Neonatol. Oct 2009;50(5):230-3. [Medline].
Chang S, Rosenberg MJ, Morton H. Identification of a mutation in liver glycogen phosphorylase in glycogen storage disease type VI. Hum Mol Genet. May 1998;7(5):865-70. [Medline].
Burwinkel B, Rootwelt T, Kvittingen EA. Severe phenotype of phosphorylase kinase-deficient liver glycogenosis with mutations in the PHKG2 gene. Pediatr Res. 2003;54(6):834-839. [Medline].
Burwinkel B, Amat L, Gray RG. Variability of biochemical and clinical phenotype in X-linked liver glycogenosis with mutations in the phosphorylase kinase PHKA2 gene. Hum Genet. Apr 1998;102(4):423-9. [Medline].
Bashan N, Iancu TC, Lerner A. Glycogenosis due to liver and muscle phosphorylase kinase deficiency. Pediatr Res. Apr 1981;15(4 Pt 1):299-303. [Medline].
Beauchamp NJ, Dalton A, Ramaswami U, et al. Glycogen storage disease type IX: High variability in clinical phenotype. Mol Genet Metab. Sep-Oct 2007;92(1-2):88-99. [Medline].
Beauchamp NJ, Taybert J, Champion MP et al. High frequency of missense mutations in glycogen storage disease type VI. J Inherit Metab Dis. Oct 2007;30:722-734. [Medline].
Burwinkel B, Bakker HD, Herschkovitz E. Mutations in the liver glycogen phosphorylase gene (PYGL) underlying glycogenosis type VI. Am J Hum Genet. Apr 1998;62(4):785-91. [Medline].
Burwinkel B, Bakker HD, Herschkovitz E, et al. Mutations in the liver glycogen phosphorylase gene (PYGL) underlying glycogenosis type VI. Am J Hum Genet. Apr 1998;62(4):785-91. [Medline].
Chen Y-T, Burchell A. Glycogen storage diseases. In: The Metabolic and Molecular Bases of Inherited Disease. Vol 1. 1995:935-65.
Goldberg T, Slonim AE. Nutrition therapy for hepatic glycogen storage diseases. J Am Diet Assoc. Dec 1993;93(12):1423-30. [Medline].
Hendrickx J, Bosshard NU, Willems P. Clinical, biochemical and molecular findings in a patient with X-linked liver glycogenosis followed for 40 years. Eur J Pediatr. Nov 1998;157(11):919-23. [Medline].
Hendrickx J, Lee P, Keating JP. Complete genomic structure and mutational spectrum of PHKA2 in patients with x-linked liver glycogenosis type I and II. Am J Hum Genet. Jun 1999;64(6):1541-9. [Medline].
Kotb MA, Abdallah HK, Kotb A. Liver glycogenoses: are they a possible cause of polyneuropathy? A cross-sectional study. J Trop Pediatr. Aug 2004;50(4):196-202. [Medline].
Newgard CB, Fletterick RJ, Anderson LA. The polymorphic locus for glycogen storage disease VI (liver glycogen phosphorylase) maps to chromosome 14. Am J Hum Genet. Apr 1987;40(4):351-64. [Medline].
Ozen H. Glycogen storage diseases: new perspectives. World J Gastroenterol. May 2007;13:2541-2553. [Medline].
Tang NL, Hui J, Young E, et al. A novel mutation (G233D) in the glycogen phosphorylase gene in a patient with hepatic glycogen storage disease and residual enzyme activity. Mol Genet Metab. Jun 2003;79(2):142-5. [Medline].
Willems PJ, Gerver WJ, Berger R. The natural history of liver glycogenosis due to phosphorylase kinase deficiency: a longitudinal study of 41 patients. Eur J Pediatr. Jan 1990;149(4):268-71. [Medline].

