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The variable clinical phenotype of liver glycogen synthase deficiency

R Spiegel1, J Mahamid, M Orho-Melander

  • 1Pediatric Department A, HaEmek Medical Center, Afula. spiegelr@zahav.net.il

Journal of Pediatric Endocrinology & Metabolism : JPEM
|March 18, 2008
PubMed

Insights

Liver glycogen synthase deficiency (GSD0) presents variably, with two new cases showing distinct symptoms from seizures to hyperglycemia. Genetic analysis of the GYS2 gene is key for diagnosing this increasingly recognized condition.

Area of Science:

  • Biochemistry
  • Genetics
  • Pediatrics

Background:

  • Liver glycogen synthase deficiency (GSD0) is a rare metabolic disorder affecting glycogen synthesis.
  • Understanding the GYS2 gene's role is crucial for diagnosing and managing GSD0.

Observation:

  • Two pediatric cases of GSD0 were identified with differing clinical presentations.
  • One patient exhibited recurrent hypoglycemic seizures, while the other had asymptomatic hyperglycemia.
  • Continuous glucose monitoring revealed significant daily fluctuations between hypoglycemia and hyperglycemia in both patients.

Findings:

  • Genetic analysis confirmed GSD0 diagnosis through mutations in the GYS2 gene.
  • The study highlights the diverse clinical spectrum of GSD0, challenging previous assumptions about its rarity.
  • The GYS2 gene is confirmed as the primary genetic cause of this condition.

Implications:

  • Early recognition of GSD0's variable phenotypes is vital for timely diagnosis and intervention.
  • Routine genetic analysis of the GYS2 gene should be considered for patients with unexplained glucose dysregulation.
  • This research underscores the importance of genetic testing in pediatric metabolic disorders.

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