Glycogen storage disease type III

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Glycogen storage disease type III

Biochemistry

Biochemistry and metabolism

Glycolysis

Citric acid cycle

Electron transport chain and oxidative phosphorylation

Gluconeogenesis

Glycogen metabolism

Pentose phosphate pathway

Physiological changes during exercise

Amino acid metabolism

Nitrogen and urea cycle

Fatty acid synthesis

Fatty acid oxidation

Ketone body metabolism

Cholesterol metabolism

Metabolic disorders

Essential fructosuria

Hereditary fructose intolerance

Galactosemia

Pyruvate dehydrogenase deficiency

Glucose-6-phosphate dehydrogenase (G6PD) deficiency

Lactose intolerance

Glycogen storage disease type I

Glycogen storage disease type II (NORD)

Glycogen storage disease type III

Glycogen storage disease type IV

Glycogen storage disease type V

Leukodystrophy

Metachromatic leukodystrophy (NORD)

Krabbe disease

Gaucher disease (NORD)

Niemann-Pick disease types A and B (NORD)

Niemann-Pick disease type C

Fabry disease (NORD)

Tay-Sachs disease (NORD)

Mucopolysaccharide storage disease type 1 (Hurler syndrome) (NORD)

Mucopolysaccharide storage disease type 2 (Hunter syndrome) (NORD)

Cystinosis

Hartnup disease

Alkaptonuria

Ornithine transcarbamylase deficiency

Phenylketonuria (NORD)

Cystinuria (NORD)

Homocystinuria

Maple syrup urine disease

Abetalipoproteinemia

Familial hypercholesterolemia

Hypertriglyceridemia

Hyperlipidemia

Disorders of carbohydrate metabolism: Pathology review

Disorders of fatty acid metabolism: Pathology review

Dyslipidemias: Pathology review

Glycogen storage disorders: Pathology review

Lysosomal storage disorders: Pathology review

Disorders of amino acid metabolism: Pathology review

Assessments

Glycogen storage disease type III

Flashcards

0 / 12 complete

USMLE® Step 1 questions

0 / 3 complete

High Yield Notes

7 pages

Flashcards

Glycogen storage disease type III

of complete

Questions

USMLE® Step 1 style questions USMLE

of complete

A 1-year-old girl is brought to the clinic for evaluation of poor growth and poor muscle tone. The mother states that the patient “doesn’t seem to be gaining weight,” despite adequate feedings. Temperature is 36.4°C (97.5°F), pulse is 98/min, blood pressure is 104/64, and respiratory rate is 35/min. Motor examination reveals diffuse hypotonia in all 4 limbs. Abdominal examination reveals hepatomegaly. Rapid fingerstick glucose is 40 mg/dL. Echocardiogram reveals left ventricular hypertrophy. Serum lactate levels are within normal limits. A liver biopsy reveals widespread fibrosis with minimal fat infiltration. Further analysis reveals accumulation of limit dextrin-like complexes in the cytosol of hepatocytes. Which of the following is the most likely diagnosis? 

External References

First Aid

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Cori disease p. 85

Debranching enzyme

Cori disease p. 85

External Links

Summary

Glycogen storage disease type III is one of the genetic disorders affecting how the body stores and uses glycogen. People with glycogen storage disease type III have a deficiency of the glycogen debrancher enzyme (α-1,6-glucosidase), one of the enzymes that help to break down glycogen. The symptoms of glycogen storage disease type III generally appear during childhood and include generalized muscle weakness, hepatosplenomegaly, fasting hypoglycemia, and ketosis.

Elsevier

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