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- $Unique_ID{BRK03758}
- $Pretitle{}
- $Title{Fructose Intolerance, Hereditary}
- $Subject{Fructose Intolerance, Hereditary Fructosemia Fructose-1-phosphate
- Aldolase Deficiency Fructosuria}
- $Volume{}
- $Log{}
-
- Copyright (C) 1986, 1987, 1990, 1992 National Organization for Rare Disorders,
- Inc.
-
- 227:
- Fructose Intolerance, Hereditary
-
- ** IMPORTANT **
- It is possible the main title of the article (Hereditary Fructose
- Intolerance) is not the name you expected. Please check the SYNONYMS listing
- to find the alternate names and disorder subdivisions covered by this
- article.
-
- Synonyms
-
- Fructosemia
- Fructose-1-phosphate Aldolase Deficiency
- Fructosuria
-
- 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.
-
-
- Hereditary Fructose Intolerance is an autosomal recessive genetically caused
- inability to digest fructose or its precursors sucrose (sugar, sorbitol and
- brown sugar). This is due to a deficiency of the enzyme
- 1-phosphofructoaldolase in the liver, kidney cortex and small intestine.
-
- Symptoms
-
- Soon after adding fructose (fruit sugar) to the diet of an infant with
- Hereditary Fructose Intolerance, prolonged vomiting, failure to thrive,
- occasional unconsciousness, jaundice, and enlargement of the liver, and
- tending to bleed because of deficiency of clotting factors may be present.
- There will be decreased levels of glucose and phosphate in the blood and
- increased levels of fructose in the blood and urine.
-
- Patients with Hereditary Fructose Intolerance usually develop a strong
- dislike for sweets and fruit. There is no intellectual impairment.
-
- It is very important to recognize the intolerance early to avoid damage
- to the liver, kidney, and small intestine.
-
- Causes
-
- Hereditary Fructose Intolerance is an autosomal recessively inherited disease
- caused by a deficiency of the enzyme 1-phospofructoaldolase. (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
-
- Hereditary Fructose Intolerance begins at birth and is present in both males
- and females.
-
- Related Disorders
-
- Essential Fructosuria is the presence of fructose in the urine after
- ingesting fructose, due to a deficiency of the hepatic enzyme fructokinase.
- It is an autosomal recessively inherited disorder.
-
- Therapies: Standard
-
- As long as patients with Hereditary Fructose Intolerance do not ingest
- fructose, they can lead a normal life. However, it is important that this
- disorder be diagnosed early so that they can be placed on a special fructose-
- free diet to prevent permanent physical damage.
-
- Therapies: Investigational
-
- Clinical trials are underway to study the metabolic pathogenesis of Fructose
- Intolerance. Interested persons may wish to contact:
-
- Donald M. Mock, M.D., Ph.D.
- Dept. of Pediatrics, W126 GH
- University of Iowa Hospitals and Clinics
- Iowa City, IA 52242
- (319) 356-3636
-
- to see if further patients are needed for this research.
-
- This disease entry is based upon medical information available through
- January 1992. 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 Hereditary Fructose Intolerance, please contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- National Digestive Diseases Information Clearinghouse
- Box NDIC
- Bethesda, MD 20892
- (301) 468-2162
-
- For information on genetics and genetic counseling referrals, please
- contact:
-
- March of Dimes Birth Defects Foundation
- 1275 Mamaroneck Ave.
- 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
-
- THE MERCK MANUAL 15th ed: R. Berkow, et al: eds; Merck, Sharp & Dohme
- Research Laboratories, 1987. P. 2079.
-
- THE METABOLIC BASIS OF INHERITED DISEASE, 6th ed.: Charles R. Scriver,
- et al.; eds., McGraw Hill, 1989. Pp. 399, 407-13.
-
-