glycogen storage disease


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glycogen

 [gli´ko-jen]
a polysaccharide that is the chief carbohydrate storage material in animals, being converted to glucose by depolymerization; it is formed by and largely stored in the liver, and to a lesser extent in muscles, and is liberated as needed.
glycogen disease glycogen storage disease.
glycogen storage disease any of a group of genetically determined disorders of glycogen metabolism, marked by abnormal storage of glycogen in the body tissues. Type I is called gierke's disease; type II is called pompe's disease; type III is called forbes' disease; type IV is called amylopectinosis; type V is called mcardle disease; and type VI is called hers' disease. In type VII, a deficiency in phosphofructokinase affects muscle and erythrocytes, with temporary weakness and cramping of skeletal muscle after exercise. In type VIII, the enzyme deficiency is unknown, but the liver and brain are affected, with hepatomegaly, truncal ataxia, and nystagmus; the neurologic deterioration progresses to hypertonia, spasticity, and death. In type IX, a deficiency in liver phosphorylase kinase results in marked hepatomegaly, which may disappear in early adulthood. In type X, a lack of activity of cyclic AMP–dependent kinase affects the liver and muscle, with mild clinical symptoms. Called also glycogen disease and glycogenosis.

glycogen storage disease

n.
Any of various genetic diseases caused by deficiency of one of the enzymes involved in breaking down or synthesizing glycogen, resulting in storage of abnormal amounts or types of glycogen and often affecting the liver, muscles, or both. Also called glycogenosis.

glycogen storage disease

Etymology: Gk, glykys + genein + L, instaurare, to renew, dis, opposite of; Fr, aise, ease
any of a group of inherited disorders of glycogen metabolism. An enzyme deficiency or defect in glycogen transport causes glycogen to accumulate in abnormally large amounts in various parts of the body. Biopsy and chemical analysis reveal the missing enzyme. Also called glycogenosis.

glycogen storage disease, type Ia


glycogen storage disease, type Ib

a form of glycogen storage disease in which excessive amounts of glycogen are deposited in the liver and leukocytes. Some symptoms are similar to, but less severe than, those of glycogen storage disease, type Ia (von Gierke's disease). Additional symptoms include neutropenia and recurrent GI inflammatory disease. Biopsy of the affected organs reveals the absence of glucose-6-phosphatase translocase, an enzyme necessary for glycogen metabolism.

glycogen storage disease, type II


glycogen storage disease, type III


glycogen storage disease, type IV


glycogen storage disease, type V


glycogen storage disease, type VI


glycogen storage disease, type VII

A clinically benign autosomal recessive [MIM 232700] metabolic disorder caused by a deficit of glycogen phosphorylase [EC 2.4.1.1] encoded on 14q21-q22

glycogen storage disease

Glycogenosis Any of a group of 12 inherited AR defects in the ability to store and/or retrieve glucose from intracellular depots, resulting in accumulation of glycogen in liver, muscle, heart, kidney, and other tissues enzyme defects, and hepatosplenomegaly, cardiomegaly, mental retardation–eg, dancing eyes syndrome–GSD VIII
Glycogen storage disease
Type  Deficient enzyme
0 Hepatic glycogen synthetase
I Glucose-6-phosphatase
II Lysosomal acid maltase alpha-1,4 glucosidase
III Amylo-1,6 glucosidase ('debrancher' disease)
IV Amylo-1,4-1,6-trans-glucosidase–'brancher' disease
V  Myophosphorylase
VI Hepatic phosphorylase
VII Phosphofructokinase
VIII Inactive hepatic phosphorylase  

glycogen storage disease

any of a group of genetically determined disorders of glycogen metabolism, marked by abnormal storage of glycogen in the body tissues. Includes Pompe's disease, Cori's disease, phosphofructokinase deficiency. See also glycogenosis.
References in periodicals archive ?
Identification of eight novel mutations of the acid alpha-glucosidase gene causing the infantile or juvenile form of glycogen storage disease type II.
Prenatal diagnosis in a Chinese family with type Ia glycogen storage disease by PCR-based genetic analysis.
Diarrhea episodes which worsen with age may be observed in patients with glycogen storage disease 1 (5).
Within the innate errors of metabolism, glycogen storage diseases are infrequent and, as with all of them, these should be considered in patients with unusual symptomatology.
The glucose-6-phosphate transporter is a phosphate-linked antiporter deficient in glycogen storage disease type Ib and Ic.
Glycogen storage disease type II: Acid alpha-glucosidase (acid maltase) deficiency.
A diagnosis of glycogen storage disease was made as a result of histopathologic examination by liver needle biopsy in the patients who were being followed up in Akdeniz University Medical Faculty, Division of Pediatric Gastroenterology, Hepatology and Nutrition.
We ruled out Type I glycogen storage disease first because no abnormality in her body growth or intelligence development and no hepatomegaly could be seen.
A final diagnosis was made based on the confirmatory investigations as 70% (23 cases) being glycogen storage disease, 15% (5 cases) being Gaucher's disease and the other 15% (5 cases) being Niemann-Pick's disease.
Glycogen storage disease type II: acid [alpha]-glucosidase (acid maltase) deficiency.
Glycogen storage disease type 1A is caused by the absence of a key enzyme involved in metabolizing, or breaking down, glycogen, the stored form of sugar in the body.
M2 PHARMA-February 15, 2017-PoC Capital to Fund Viking Therapeutics' Development of VK2809 in Glycogen Storage Disease Ia

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