Easy way to remember all glycogen storage disease
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Now I have everything I need. Here is a complete, easy-to-remember breakdown of all Glycogen Storage Diseases:
Glycogen Storage Diseases - Easy Memory Guide
The Master Mnemonic
"Very Poor Carbohydrate Affects Muscle and Hepatic Tissue"
| Letter | Type | Eponym | Enzyme Deficient |
|---|---|---|---|
| Very | Type I | Von Gierke | Glucose-6-phosphatase |
| Poor | Type II | Pompe | Acid maltase (α-1,4-glucosidase) |
| Carbohydrate | Type III | Cori / Forbes | Debranching enzyme |
| Affects | Type IV | Anderson | Branching enzyme |
| Muscle | Type V | McArdle | Muscle phosphorylase |
| Hepatic | Type VI | Hers | Liver phosphorylase |
| Tissue | Type VII | Tarui | Phosphofructokinase |
Remember Each Type with a Story
Type I - Von Gierke's ("The Big Liver Baby")
- Enzyme: Glucose-6-phosphatase
- Think: "Von Gierke Goes nowhere" - glucose-6-phosphatase missing = glucose can't Go out of liver
- Features: Massive hepatomegaly, severe hypoglycemia, lactic acidosis, hyperuricemia, hyperlipidemia
- Treatment: Uncooked cornstarch (slow-release glucose), avoid fructose/galactose/sucrose
Type II - Pompe's ("The Heart Pump Fails")
- Enzyme: Acid maltase (lysosomal α-glucosidase)
- Think: "Pompe needs a Pump" - heart pump fails (cardiomegaly is hallmark)
- Features: Cardiomegaly, muscle weakness, respiratory failure; only GSD that is a lysosomal storage disease
- Key: Only GSD with cardiomegaly in infants
- Treatment: Alglucosidase alfa (enzyme replacement) - Goldman-Cecil Medicine
Type III - Cori's / Forbes ("Debranching - Half the Problem")
- Enzyme: Debranching enzyme (amylo-1,6-glucosidase)
- Think: "Cori Corrects Core branches" - the de-branching fails
- Features: Like Type I but milder; hepatomegaly + muscle involvement; gluconeogenesis is INTACT (unlike Type I)
- Diet: High protein diet helps because gluconeogenesis works
Type IV - Anderson's ("Bad Branches")
- Enzyme: Branching enzyme (amylo-1,4 → 1,6-glucan transferase)
- Think: "Anderson Adds bad branches" - glycogen has abnormally long outer chains (like amylopectin)
- Features: Progressive liver cirrhosis, cardiomyopathy; liver transplant is the treatment
Type V - McArdle's ("Muscle Can't Exercise")
- Enzyme: Muscle phosphorylase
- Think: "McArdle = Muscle Cannot" - muscles can't break glycogen during exercise
- Features: Exercise intolerance, muscle cramps, myoglobinuria; no rise in lactate with forearm exercise test
- Key sign: "Second wind phenomenon" - symptoms improve after initial exercise as fatty acids kick in
Type VI - Hers' ("Hepatic - mostly benign")
- Enzyme: Liver phosphorylase
- Think: "Hers = Hepatic, Harmless" - mild liver disease, usually benign
- Features: Hepatomegaly, mild hypoglycemia; best prognosis of all hepatic GSDs
Type VII - Tarui's ("Tarui Traps muscle like McArdle")
- Enzyme: Phosphofructokinase (PFK)
- Think: "Tarui = Type V twin" - same symptoms as McArdle (exercise intolerance, cramps), but also has hemolytic anemia
- Difference from McArdle: Eating glucose makes it worse (avoid glucose before exercise)
Quick Classification by Organ
| Hepatic Forms (liver + hypoglycemia) | Myopathic Forms (muscle + exercise) | Both |
|---|---|---|
| Type I (Von Gierke) | Type V (McArdle) | Type III (Cori) |
| Type VI (Hers) | Type VII (Tarui) | Type II (Pompe) - generalized |
| Type IV (Anderson) |
The "AB CD" Sub-Mnemonic (for Types III & IV)
- Type III → Debranching enzyme (Branch removal)
- Type IV → Branching enzyme (Branch addition fails)
- "3 removes branches, 4 can't add them"
High-Yield Exam Points
| Feature | Disease |
|---|---|
| Only lysosomal GSD | Type II (Pompe) |
| Cardiomegaly in infant | Type II (Pompe) |
| No rise in lactate on exercise | Type V (McArdle) |
| "Second wind" phenomenon | Type V (McArdle) |
| Eating glucose worsens symptoms | Type VII (Tarui) |
| Hepatic adenomas + severe hypoglycemia | Type I (Von Gierke) |
| Progressive cirrhosis in childhood | Type IV (Anderson) |
| Best prognosis | Type VI (Hers) |
| Intact gluconeogenesis (unlike Type I) | Type III (Cori) |
| Neutropenia + IBD (in Type Ib) | Type I (Von Gierke) |
| All autosomal recessive | All (except Type IX a/b = X-linked) |
One-Line Story to Remember Order
"Von Gierke's Poor kid Can'tAlways Make His Target"
Type I → II → III → IV → V → VI → VII
(Goldman-Cecil Medicine; Tietz Textbook of Laboratory Medicine, 7th Ed.)
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