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$Unique_ID{BRK04254}
$Pretitle{}
$Title{Tarui Disease}
$Subject{Tarui Disease Glycogen Disease of Muscle Glycogen Storage Disease VII
Glycogenosis Type VII Muscle Phosphofructokinase Deficiency
Phosphofructokinase Deficiency McArdle Disease Pompe Disease Forbes Disease }
$Volume{}
$Log{}
Copyright (C) 1987, 1990, 1991 National Organization for Rare Disorders,
Inc.
397:
Tarui Disease
** IMPORTANT **
It is possible the main title of the article (Tarui Disease) is not the
name you expected. Please check the SYNONYMS listing on the next page to
find alternate names, disorder subdivisions, and related disorders covered by
this article.
Synonyms
Glycogen Disease of Muscle
Glycogen Storage Disease VII
Glycogenosis Type VII
Muscle Phosphofructokinase Deficiency
Phosphofructokinase Deficiency
Information on the following diseases can be found in the Related
Disorders section of this report:
McArdle Disease
Pompe Disease
Forbes Disease
General Discussion
** REMINDER **
The information contained in the Rare Disease Database is provided for
educational purposes only. It should not be used for diagnostic or treatment
purposes. If you wish to obtain more information about this disorder, please
contact your personal physician and/or the agencies listed in the "Resources"
section of this report.
Tarui Disease is a glycogen storage disease. Symptoms of this hereditary
metabolic disorder are caused by a lack of the enzyme phosphofructokinase in
muscle and a partial deficiency of the enzyme in red blood cells. The enzyme
deficiency prevents the breakdown of glucose into energy. Tarui Disease is
characterized by pain and cramps in muscles during heavy exercise.
Symptoms
Symptoms of Tarui Disease include pain and cramps in muscles during strenuous
exercise. These symptoms usually are not severe.
Causes
Tarui Disease is a disorder inherited through autosomal recessive genes. The
condition is caused by a deficiency of the enzyme phosphofructokinase. This
enzyme normally converts fructose-6-phosphate to fructose-1,6-diphosphate.
This is the controlling step in the breakdown of glucose into available
energy. Therefore, energy is not available to a muscle during heavy
exercise. Consequently, pain and cramps occur in the muscle.
Human traits including the classic genetic diseases, are the product of
the interaction of two genes for that condition, one received from the father
and one from the mother. In recessive disorders, the condition does not
appear unless a person inherits the same defective gene from each parent. If
one receives one normal gene and one gene for the disease, the person will be
a carrier for the disease, but usually will show no symptoms. The risk of
transmitting the disease to the children of a couple, both of whom are
carriers for a recessive disorder, is twenty-five percent. Fifty percent of
their children will be carriers, but healthy as described above. Twenty-five
percent of their children will receive both normal genes, one from each
parent and will be genetically normal.
Affected Population
All Glycogen Storage Diseases together affect about 1 in 40,000 persons in
the United States. Tarui Disease affects males and females in equal numbers.
Related Disorders
Glycogen Storage Diseases are caused by inborn errors of metabolism in which
the balance between stored energy (glycogen) and available energy (sugar or
glucose) is disturbed. Too much glycogen to be stored in the liver and
muscles and too little sugar available in the blood.
The following disorders are similar to Tarui Disease. These can be
compared to Tarui Disease for a differential diagnosis:
McArdle Disease is a glycogen storage disease. Symptoms of this
hereditary metabolic disorder are caused by an inborn lack of the enzyme
myophosphorylase. This enzyme is needed for the breakdown of glycogen (the
body's form of stored energy) into sugar (glucose). In McArdle Disease the
breakdown of glucose cannot take place. Severe muscle cramps occur as a
result of heavy exercise.
Pompe Disease is a glycogen storage disease. This hereditary metabolic
disorder is caused by an inborn lack of the enzyme alpha-1,4 glucosidase
(lysosomal glucosidase; acid maltase). This enzyme deficiency causes excess
amounts of glycogen (the stored form of energy that comes from carbohydrates)
to accumulate in all body tissues, especially in the heart muscle.
Forbes Disease is a glycogen storage disorder inherited through autosomal
recessive genes. Symptoms are caused by a lack of the enzyme amylo-1,6
glucosidase (debrancher enzyme). This enzyme deficiency causes excess
amounts of glycogen (the stored form of energy that comes from carbohydrates)
to be deposited in the liver, muscles and heart. The nerves ic the back of
the legs and on the sides of the heel and foot (sural nerves) also accumulate
excess glycogen. The heart may be involved in some cases.
For more information on the above disorders, choose "McArdle," "Pompe,"
and "Forbes" as your search terms in the Rare Disease Database.
Therapies: Standard
Treatment of Tarui Disease is symptomatic and supportive. Strenuous exercise
should be avoided to prevent muscle pain and cramps.
Therapies: Investigational
Dr. Y.T. Chen at Duke University Medical Center, at the request of the
Glycogen Storage Disease Association, is collecting DNA from patients with
Glycogen Storage Disease Type I to form a DNA bank for GSDI. Interested
patients may contact the Glycogen Storage Diseases Association for further
information. The address and phone number of the organization are listed in
the Resources section of this report.
This disease entry is based upon medical information available through
February 1991. Since NORD's resources are limited, it is not possible to
keep every entry in the Rare Disease Database completely current and
accurate. Please check with the agencies listed in the Resources section for
the most current information about this disorder.
Resources
For more information on Tarui Disease, please contact:
National Organization for Rare Disorders (NORD)
P.O. Box 8923
New Fairfield, CT 06812-1783
(203) 746-6518
Association for Glycogen Storage Disease
P.O. Box 896
Durant, IA 52747
(319) 785-6038
National Digestive Diseases Information Clearinghouse
Box NDDIC
Bethesda, MD 20892
(301) 468-6344
Research Trust for Metabolic Diseases in Children
Golden Gates Lodge, Weston Rd.
Crewe CW1 1XN, England
Telephone: (0270) 250244
For information on genetics and genetic counseling referrals, please
contact:
March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
(914) 428-7100
Alliance of Genetic Support Groups
35 Wisconsin Circle, Suite 440
Chevy Chase, MD 20815
(800) 336-GENE
(301) 652-5553
References
EXCESS PURINE DEGRADATION IN EXERCISING MUSCLES OF PATIENTS WITH MUSCLE
GLYCOGEN STORAGE DISEASE TYPES V AND VII: I. Mineo, et al.; Journal Clin
Invest (August 1985: issue 76,2). Pp. 556-560.