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- $Unique_ID{BRK03775}
- $Pretitle{}
- $Title{Glutaricaciduria I}
- $Subject{Glutaricaciduria I GA I Glutaric Acidemia I Glutaric Aciduria I
- Glutaricacidemia I Glutaryl-CoA Dehydrogenase Deficiency Dicarboxylic
- Aminoaciduria Glutaurate-Aspartate Transport Defect Glutaricaciduria IIA GA
- IIA Glutaricaciduria IIB GA IIB}
- $Volume{}
- $Log{}
-
- Copyright (C) 1987, 1990 National Organization for Rare Disorders, Inc.
-
- 383:
- Glutaricaciduria I
-
- ** IMPORTANT **
- It is possible the main title of the article (Glutaricaciduria I) 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
-
- GA I
- Glutaric Acidemia I
- Glutaric Aciduria I
- Glutaricacidemia I
- Glutaryl-CoA Dehydrogenase Deficiency
- Dicarboxylic Aminoaciduria
- Glutaurate-Aspartate Transport Defect
-
- Information on the following diseases can be found in the Related
- Disorders section of this report:
-
- Glutaricaciduria IIA (GA IIA)
- Glutaricaciduria IIB (GA IIB)
-
- 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.
-
- Glutaricaciduria is a rare hereditary metabolic disorder, caused by a
- deficiency of the enzyme glutaryl-CoA dehydrogenase. One of a group of
- disorders known as "organic acidemias", it is characterized by decreased
- muscle tone (hypotonia), vomiting, and excess acid in the blood. The patient
- may also have involuntary movements of the trunk and limbs (dystonia or
- athetosis) and mental retardation may also occur.
-
- Symptoms
-
- Babies with Glutaricaciduria usually appear normal at birth. During the
- first year of life decreased muscle tone (hypotonia), vomiting, and acidity
- of the blood may occur. Taking on strange positions due to disordered muscle
- tone (dystonia), involuntary and ceaseless slow, sinuous, writhing
- (athetotic) or jerky (choreic) movements of the trunk and limbs may also
- occur in combination with mental retardation.
-
- Elevated concentrations of glutaric acid, beta-hydroxy-glutaric acid and
- occasionally glutaconic acid appears in the urine of children with this
- disorder. Excretion of glutaric acid in the urine may exceed 1 gram per day,
- an excessive amount. Glutaric acid concentrations are also elevated in blood
- serum, cerebrospinal fluid, and body tissues. Some of these patients may
- have unusual facial features (dysmorphia). A type of spasm in which the head
- and the heels are bent backward while the trunk is bowed forward
- (opisthotonus) may also occur.
-
- Causes
-
- Glutaricaciduria is an autosomal recessive hereditary disorder caused by a
- deficiency of the enzyme glutaryl-CoA dehydrogenase. Accumulation of 5-
- carbon dicarboxylic acids may impair synthesis of gamma-aminobutyric acid
- (GABA) which functions as a neurotransmitter in the brain, inhibiting nerve
- excitation.
-
- 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
-
- Glutaricaciduria is a very rare inborn error of metabolism that affects males
- as often as females. There may be less than 100 cases of this type of
- organic aciduria in the United States.
-
- Related Disorders
-
- There are many rare disorders caused by enzyme deficiencies. To locate these
- disorders in the Rare Disease Database choose "Enzyme Deficiency" as your
- search term.
-
- There are two forms of Glutaricaciduria II which occur during different
- stages of life. They are both forms of organic acidemias which are a group
- of metabolic disorders characterized by excess acid in the blood and urine.
-
- 1) Glutaricaciduria IIA (GA IIA), Neonatal Form of Glutaricaciduria II.
- This neonatal form of Glutaricaciduria II is a very rare, sex-linked
- hereditary disorder characterized by large amounts of glutaric and other
- acids in blood and urine. Some researchers believe the disorder is caused by
- a defect in the breakdown of acyl-CoA compounds.
-
- 2) Glutaricaciduria IIB (GA IIB; Ethylmalonic Adipicaciduria), Adult Form
- of Glutaricaciduria II.
- This milder form of the disorder is inherited as an autosomal recessive
- trait. Acidity of the body tissues (metabolic acidosis), and a low blood
- sugar level (hypoglycemia) without an elevated level of ketones in body
- tissues (ketosis), occur during adulthood. Large amounts of glutaric acid
- in the blood and urine are caused by a deficiency of the enzyme "multiple
- acyl-CoA dehydrogenase". (For more information on this disorder, choose
- "Glutaricaciduria II" as your search term in the Rare Disease Database.)
-
- Therapies: Standard
-
- Glutaricaciduria is diagnosed when excessive glutaric acid is found in the
- urine or by analysis of the deficient enzyme in white blood cells
- (leukocytes). Detection of the disorder in a fetus may be possible by
- testing for the enzyme glutaryl CoA dehydrogenase. It is imperative to test
- for this disorder as soon after birth as possible. Peritoneal dialysis
- hemodialysis may be necessary. The usefulness of restricting the amino acids
- lysine, hydroxylysine, and tryptophan (which generate glutaric acid when they
- are metabolized), is not established at the present time. Acute episodes of
- acidity in blood and body tissues (acidosis) and dehydration are treated with
- fluids and bicarbonate. Many of the adverse effects of organic acidemias are
- due to secondary carnitine depletion. Such patients should have plasma
- carnitine measured and, if deficient, begin a supplement of 100-300 mg/kg/day
- of oral l-carnitine.
-
- Genetic counseling is recommended for families of children with
- Glutaricaciduria.
-
- Therapies: Investigational
-
- Glutaricaciduria has been treated on an experimental basis with a low protein
- diet, riboflavin and Lioresal, a gamma-aminobutyric acid (GABA)-analog. Diet
- and riboflavin has had a slight-to-moderate effect on the clinical symptoms.
- The excretion of glutaric acid and 2-amino-adipic acid in the urine decreased
- considerably during this treatment. Some neurological symptoms regressed
- during treatment with Lioresal. Although this treatment is experimental,
- some researchers suggest that patients with Glutaricaciduria should be
- treated as early as possible with this method. However, long-term effects
- are unknown.
-
- Clinical trials are underway to study isotope technique in glucogenesis
- and Krebs cycle and patient response to treatment. Interested persons may
- wish to contact:
-
- Dr. W.N. Paul Lee
- Habor - University of CA, Los Angeles Medical Center
- Dept. of Pediatrics, Box 16
- 1000 W. Carson St.
- (213) 533-2503
-
- to see if further patients are needed for this study.
-
- 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 Glutaricaciduria I, please contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- National Urea Cycle Disorders Foundation
- 4559 Vauxhall Rd.
- Richmond, VA 23234-3556
-
- Saul Brusilow, M.D.
- 301 Children's Medical and Surgical Center
- Johns Hopkins Hospital
- 600 N. Wolfe St.
- Baltimore, MD 21205
- (310) 955-0885
-
- Organic Acidemia Association
- 522 Lander St.
- Reno, NV 89512
- (703) 322-5542
-
- British Organic Acidemia Association
- 5 Saxon Rd.
- Ashford, Middlesex TW15 1QL
- England
-
- 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
-
- SYMPTOMATIC INBORN ERRORS OF METABOLISM IN THE NEONATE: Saul W. Brusilow and
- David L. Vallee; In: Current Therapy in Neonatal-Perinatal Medicine. Marcel
- Decker, 1985. Pp. 24-27.
-
- TREATMENT OF GLUTARYL-CoA DEHYDROGENASE DEFICIENCY (GLUTARIC ACIDURIA).
- EXPERIENCE WITH DIET, RIBOFLAVIN, AND GABA ANALOG: N.J. Brandt, et al.;
- Journal of Pediatrics (April 1979: issue 94,4). Pp. 669-673.
-
-