Glycogen storage disease: Difference between revisions
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{{SI}} <includeonly>{{Infobox medical condition | |||
| name = Glycogen storage disease | |||
| image = [[File:Glycogen_storage_disorder_(PAS_with_diastase).jpg|250px]] | |||
| caption = Micrograph of a glycogen storage disorder, PAS with diastase stain | |||
| synonyms = Glycogenosis, dextrinosis | |||
| pronounce = | |||
| specialty = [[Endocrinology]], [[Genetics]] | |||
| symptoms = [[Hypoglycemia]], [[hepatomegaly]], [[muscle weakness]], [[cardiomyopathy]] | |||
| onset = Varies by type | |||
| duration = Chronic | |||
| types = [[Glycogen storage disease type I|Type I]], [[Glycogen storage disease type II|Type II]], [[Glycogen storage disease type III|Type III]], etc. | |||
| causes = [[Genetic mutation]] | |||
| risks = Family history | |||
| diagnosis = [[Genetic testing]], [[biopsy]] | |||
| differential = [[Mitochondrial disease]], [[muscular dystrophy]] | |||
| prevention = Genetic counseling | |||
| treatment = [[Dietary management]], [[enzyme replacement therapy]] | |||
| medication = | |||
| prognosis = Varies by type | |||
| frequency = 1 in 20,000 to 25,000 | |||
| deaths = | |||
}} | |||
</includeonly> | |||
{{Documentation}} | |||
{{Short description|Group of inherited metabolic disorders affecting glycogen metabolism}} | {{Short description|Group of inherited metabolic disorders affecting glycogen metabolism}} | ||
'''Glycogen storage disease''' (GSD) refers to a group of inherited [[metabolic disorders]] that affect the body's ability to store and utilize [[glycogen]], a form of [[glucose]] stored in the [[liver]] and [[muscles]]. These disorders are caused by deficiencies in the enzymes responsible for glycogen synthesis or breakdown, leading to an accumulation or deficiency of glycogen in various tissues. | '''Glycogen storage disease''' (GSD) refers to a group of inherited [[metabolic disorders]] that affect the body's ability to store and utilize [[glycogen]], a form of [[glucose]] stored in the [[liver]] and [[muscles]]. These disorders are caused by deficiencies in the enzymes responsible for glycogen synthesis or breakdown, leading to an accumulation or deficiency of glycogen in various tissues. | ||
==Classification== | ==Classification== | ||
Glycogen storage diseases are classified based on the specific enzyme deficiency and the affected tissue. The most common types include: | Glycogen storage diseases are classified based on the specific enzyme deficiency and the affected tissue. The most common types include: | ||
* '''Type I (Von Gierke's disease)''': Caused by a deficiency of the enzyme [[glucose-6-phosphatase]], leading to severe [[hypoglycemia]] and accumulation of glycogen in the liver and kidneys. | * '''Type I (Von Gierke's disease)''': Caused by a deficiency of the enzyme [[glucose-6-phosphatase]], leading to severe [[hypoglycemia]] and accumulation of glycogen in the liver and kidneys. | ||
* '''Type II (Pompe disease)''': Results from a deficiency of [[acid alpha-glucosidase]], affecting the heart and skeletal muscles. | * '''Type II (Pompe disease)''': Results from a deficiency of [[acid alpha-glucosidase]], affecting the heart and skeletal muscles. | ||
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* '''Type V (McArdle's disease)''': Characterized by a deficiency of [[muscle phosphorylase]], affecting muscle metabolism and causing exercise intolerance. | * '''Type V (McArdle's disease)''': Characterized by a deficiency of [[muscle phosphorylase]], affecting muscle metabolism and causing exercise intolerance. | ||
* '''Type VI (Hers disease)''': Due to a deficiency of liver phosphorylase, leading to mild hypoglycemia and hepatomegaly. | * '''Type VI (Hers disease)''': Due to a deficiency of liver phosphorylase, leading to mild hypoglycemia and hepatomegaly. | ||
==Pathophysiology== | ==Pathophysiology== | ||
Glycogen storage diseases result from mutations in genes encoding enzymes involved in glycogen metabolism. These mutations lead to either an accumulation of glycogen in tissues or an inability to mobilize glycogen stores, resulting in various clinical manifestations. The specific symptoms depend on the type of GSD and the tissues affected. | Glycogen storage diseases result from mutations in genes encoding enzymes involved in glycogen metabolism. These mutations lead to either an accumulation of glycogen in tissues or an inability to mobilize glycogen stores, resulting in various clinical manifestations. The specific symptoms depend on the type of GSD and the tissues affected. | ||
==Clinical Manifestations== | ==Clinical Manifestations== | ||
The clinical presentation of glycogen storage diseases varies widely depending on the type and severity of the enzyme deficiency. Common symptoms include: | The clinical presentation of glycogen storage diseases varies widely depending on the type and severity of the enzyme deficiency. Common symptoms include: | ||
* [[Hypoglycemia]] | * [[Hypoglycemia]] | ||
* [[Hepatomegaly]] | * [[Hepatomegaly]] | ||
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* Growth retardation | * Growth retardation | ||
* [[Lactic acidosis]] | * [[Lactic acidosis]] | ||
==Diagnosis== | ==Diagnosis== | ||
Diagnosis of glycogen storage diseases typically involves a combination of clinical evaluation, biochemical tests, and genetic analysis. Key diagnostic steps include: | Diagnosis of glycogen storage diseases typically involves a combination of clinical evaluation, biochemical tests, and genetic analysis. Key diagnostic steps include: | ||
* Measurement of blood glucose and lactate levels | * Measurement of blood glucose and lactate levels | ||
* Liver function tests | * Liver function tests | ||
* Muscle biopsy and enzyme assays | * Muscle biopsy and enzyme assays | ||
* Genetic testing to identify specific mutations | * Genetic testing to identify specific mutations | ||
==Management== | ==Management== | ||
Management of glycogen storage diseases focuses on controlling symptoms and preventing complications. Treatment strategies may include: | Management of glycogen storage diseases focuses on controlling symptoms and preventing complications. Treatment strategies may include: | ||
* Dietary modifications to maintain normal blood glucose levels | * Dietary modifications to maintain normal blood glucose levels | ||
* Enzyme replacement therapy, particularly for Pompe disease | * Enzyme replacement therapy, particularly for Pompe disease | ||
* Liver transplantation in severe cases | * Liver transplantation in severe cases | ||
* Physical therapy to manage muscle symptoms | * Physical therapy to manage muscle symptoms | ||
==Prognosis== | ==Prognosis== | ||
The prognosis for individuals with glycogen storage diseases varies depending on the type and severity of the disorder. Early diagnosis and appropriate management can improve outcomes and quality of life for many patients. | The prognosis for individuals with glycogen storage diseases varies depending on the type and severity of the disorder. Early diagnosis and appropriate management can improve outcomes and quality of life for many patients. | ||
==See also== | |||
== | |||
* [[Metabolic disorder]] | * [[Metabolic disorder]] | ||
* [[Enzyme deficiency]] | * [[Enzyme deficiency]] | ||
Latest revision as of 01:51, 7 April 2025
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
W8MD's medical weight loss NYC, sleep center NYC
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Group of inherited metabolic disorders affecting glycogen metabolism
Glycogen storage disease (GSD) refers to a group of inherited metabolic disorders that affect the body's ability to store and utilize glycogen, a form of glucose stored in the liver and muscles. These disorders are caused by deficiencies in the enzymes responsible for glycogen synthesis or breakdown, leading to an accumulation or deficiency of glycogen in various tissues.
Classification[edit]
Glycogen storage diseases are classified based on the specific enzyme deficiency and the affected tissue. The most common types include:
- Type I (Von Gierke's disease): Caused by a deficiency of the enzyme glucose-6-phosphatase, leading to severe hypoglycemia and accumulation of glycogen in the liver and kidneys.
- Type II (Pompe disease): Results from a deficiency of acid alpha-glucosidase, affecting the heart and skeletal muscles.
- Type III (Cori disease): Due to a deficiency in the debranching enzyme, leading to abnormal glycogen structure and accumulation in the liver and muscles.
- Type IV (Andersen's disease): Caused by a deficiency in the branching enzyme, resulting in abnormal glycogen that can lead to liver cirrhosis.
- Type V (McArdle's disease): Characterized by a deficiency of muscle phosphorylase, affecting muscle metabolism and causing exercise intolerance.
- Type VI (Hers disease): Due to a deficiency of liver phosphorylase, leading to mild hypoglycemia and hepatomegaly.
Pathophysiology[edit]
Glycogen storage diseases result from mutations in genes encoding enzymes involved in glycogen metabolism. These mutations lead to either an accumulation of glycogen in tissues or an inability to mobilize glycogen stores, resulting in various clinical manifestations. The specific symptoms depend on the type of GSD and the tissues affected.
Clinical Manifestations[edit]
The clinical presentation of glycogen storage diseases varies widely depending on the type and severity of the enzyme deficiency. Common symptoms include:
- Hypoglycemia
- Hepatomegaly
- Muscle weakness and cramps
- Cardiomyopathy
- Growth retardation
- Lactic acidosis
Diagnosis[edit]
Diagnosis of glycogen storage diseases typically involves a combination of clinical evaluation, biochemical tests, and genetic analysis. Key diagnostic steps include:
- Measurement of blood glucose and lactate levels
- Liver function tests
- Muscle biopsy and enzyme assays
- Genetic testing to identify specific mutations
Management[edit]
Management of glycogen storage diseases focuses on controlling symptoms and preventing complications. Treatment strategies may include:
- Dietary modifications to maintain normal blood glucose levels
- Enzyme replacement therapy, particularly for Pompe disease
- Liver transplantation in severe cases
- Physical therapy to manage muscle symptoms
Prognosis[edit]
The prognosis for individuals with glycogen storage diseases varies depending on the type and severity of the disorder. Early diagnosis and appropriate management can improve outcomes and quality of life for many patients.
See also[edit]
| Inborn error of carbohydrate metabolism: monosaccharide metabolism disorders (E73–E74, 271) Including glycogen storage diseases (GSD) |
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| Diseases of muscle, neuromuscular junction, and neuromuscular disease | ||||||||||||||
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