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Case of Neonatal Fatality from Neuromuscular Variant of Glycogen Storage Disease Type IV

  • Tavleen Sandhu
  • Michelle Polan
  • Zhongxin Yu
  • Rufei Lu
  • Abhishek Makkar
Research Report
Part of the JIMD Reports book series

Abstract

Glycogen storage disease type IV (GSD-IV), or Andersen disease, is a rare autosomal recessive disorder that results from the deficiency of glycogen branching enzyme (GBE). This in turn results in accumulation of abnormal glycogen molecules that have longer outer chains and fewer branch points. GSD-IV manifests in a wide spectrum, with variable phenotypes depending on the degree and type of tissues in which this abnormal glycogen accumulates. Typically, GSD-IV presents with rapidly progressive liver cirrhosis and death in early childhood. However, there is a severe congenital neuromuscular variant of GSD-IV that has been reported in the literature, with fewer than 20 patient cases thus far. We report an unusual case of GSD-IV neuromuscular variant in a late preterm female infant who was born to non-consanguineous healthy parents with previously healthy children. Prenatally, our patient was found to have decreased fetal movement and polyhydramnios warranting an early delivery. Postnatally, she had severe hypotonia and respiratory failure, with no hepatic or cardiac involvement. Extensive metabolic and neurological workup revealed no abnormalities. However, molecular analysis by whole-exome sequencing revealed two pathogenic variants in the GBE1 gene. Our patient was thus a compound heterozygote of the two pathogenic variants: one of these was inherited from the mother [p.L490WfsX5 (c.1468delC)], and the other pathogenic variant was a de novo change [p.E449X (c.1245G>T)]. As expected in GSD-IV, diffuse intracytoplasmic periodic acid-Schiff-positive, diastase-resistant inclusions were found in the cardiac myocytes, hepatocytes, and skeletal muscle fibers of our patient.

Notes

Acknowledgment

We thank Kathy Kyler for editorial support throughout writing process. We thank Drs. Henry Tran and Kar-Ming Fung for their assistant in sampling and examining the thigh muscular tissue.

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Copyright information

© Society for the Study of Inborn Errors of Metabolism (SSIEM) 2018

Authors and Affiliations

  • Tavleen Sandhu
    • 1
  • Michelle Polan
    • 2
  • Zhongxin Yu
    • 3
  • Rufei Lu
    • 3
  • Abhishek Makkar
    • 1
  1. 1.Department of NeonatologyThe Children’s Hospital at OU Medical CenterOklahoma CityUSA
  2. 2.Division of Human GeneticsThe Children’s Hospital at OU Medical CenterOklahoma CityUSA
  3. 3.Department of PathologyThe Children’s Hospital at OU Medical CenterOklahoma CityUSA

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