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GTR Home > Conditions/Phenotypes > Glucose-6-phosphate transport defect

Glucose-6-phosphate transport defect

Synonyms
GSD Ib; Glycogen Storage Disease Type Ib; Glycogen storage disease type 1B

Summary

Excerpted from the GeneReview: Glycogen Storage Disease Type I
Glycogen storage disease type I (GSD I) is characterized by accumulation of glycogen and fat in the liver and kidneys resulting in hepatomegaly and nephromegaly. Severely affected infants present in the neonatal period with severe hypoglycemia due to fasting intolerance. More commonly, untreated infants present at age three to four months with hepatomegaly, severe hypoglycemia with or without seizures, lactic acidosis, hyperuricemia, and hypertriglyceridemia. Affected children typically have doll-like faces with full cheeks, relatively thin extremities, short stature, and a protuberant abdomen. Xanthoma and diarrhea may be present. Impaired platelet function and development of reduced or dysfunctional von Willebrand factor can lead to a bleeding tendency with frequent epistaxis and menorrhagia in females. Individuals with untreated GSD Ib are more likely to develop impaired neutrophil and monocyte function as well as chronic neutropenia resulting in recurrent bacterial infections, gingivitis, periodontitis, and genital and intestinal ulcers. Long-term complications of untreated GSD I include short stature, osteoporosis, delayed puberty, renal disease (including proximal and distal renal tubular acidosis, renal stones, and kidney failure), gout, systemic hypertension, pulmonary hypertension, hepatic adenomas with potential for malignancy, pancreatitis, and polycystic ovaries. Seizures and cognitive impairment may occur in individuals with prolonged periods of hypoglycemia. Normal growth and puberty are expected in treated children. Most affected individuals live into adulthood.
Full text of GeneReview (by section):
Summary
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Deeksha S Bali
Areeg El-Gharbawy
Stephanie Austin
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Available tests

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Clinical tests (99 available)

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Molecular Genetics Tests

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  • Also known as: CDG2W, G6PT, G6PT1, G6PT2, G6PT3, GSD1b, GSD1c, GSD1d, PRO0685, SPX4, TRG-19, TRG19, SLC37A4
    Summary: solute carrier family 37 member 4

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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