+1 credit
| Version | Summary | Created by | Modification | Content Size | Created at | Operation |
|---|---|---|---|---|---|---|
| 1 | Camila Xu | + 406 word(s) | 406 | 2020-12-15 07:25:33 |
Video Upload Options
Glutathione synthetase deficiency is a disorder that prevents the production of an important molecule called glutathione. Glutathione helps prevent damage to cells by neutralizing harmful molecules generated during energy production. Glutathione also plays a role in processing medications and cancer-causing compounds (carcinogens), and building DNA, proteins, and other important cellular components.
1. Introduction
Glutathione synthetase deficiency can be classified into three types: mild, moderate, and severe. Mild glutathione synthetase deficiency usually results in the destruction of red blood cells (hemolytic anemia). In addition, affected individuals may release large amounts of a compound called 5-oxoproline in their urine (5-oxoprolinuria). This compound builds up when glutathione is not processed correctly in cells.
Individuals with moderate glutathione synthetase deficiency may experience symptoms beginning shortly after birth including hemolytic anemia, 5-oxoprolinuria, and elevated acidity in the blood and tissues (metabolic acidosis).
In addition to the features present in moderate glutathione synthetase deficiency, individuals affected by the severe form of this disorder may experience neurological symptoms. These problems may include seizures; a generalized slowing down of physical reactions, movements, and speech (psychomotor retardation); intellectual disability; and a loss of coordination (ataxia). Some people with severe glutathione synthetase deficiency also develop recurrent bacterial infections.
2. Frequency
Glutathione synthetase deficiency is very rare. This disorder has been described in more than 70 people worldwide.
3. Causes
Mutations in the GSS gene cause glutathione synthetase deficiency. The GSS gene provides instructions for making an enzyme called glutathione synthetase. This enzyme is involved in a process called the gamma-glutamyl cycle, which takes place in most of the body's cells. This cycle is necessary for producing a molecule called glutathione. Glutathione protects cells from damage caused by unstable oxygen-containing molecules, which are byproducts of energy production. Glutathione is called an antioxidant because of its role in protecting cells from the damaging effects of these unstable molecules. Mutations in the GSS gene prevent cells from making adequate levels of glutathione, leading to the signs and symptoms of glutathione synthetase deficiency.
4. Inheritance
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
5. Other Names for This Condition
-
5-oxoprolinemia
-
5-oxoprolinuria
-
deficiency of glutathione synthase
-
deficiency of glutathione synthetase
-
pyroglutamic acidemia
-
pyroglutamic aciduria
References
- Al-Jishi E, Meyer BF, Rashed MS, Al-Essa M, Al-Hamed MH, Sakati N, Sanjad S,Ozand PT, Kambouris M. Clinical, biochemical, and molecular characterization ofpatients with glutathione synthetase deficiency. Clin Genet. 1999Jun;55(6):444-9.
- Ben Ameur S, Aloulou H, Nasrallah F, Kamoun T, Kaabachi N, Hachicha M.Hemolytic anemia and metabolic acidosis: think about glutathione synthetasedeficiency. Fetal Pediatr Pathol. 2015 Feb;34(1):18-20. doi:10.3109/15513815.2014.947543.
- Njålsson R, Norgren S. Physiological and pathological aspects of GSHmetabolism. Acta Paediatr. 2005 Feb;94(2):132-7. Review.
- Njålsson R, Ristoff E, Carlsson K, Winkler A, Larsson A, Norgren S. Genotype, enzyme activity, glutathione level, and clinical phenotype in patients withglutathione synthetase deficiency. Hum Genet. 2005 Apr;116(5):384-9.
- Njålsson R. Glutathione synthetase deficiency. Cell Mol Life Sci. 2005Sep;62(17):1938-45. Review.
- Ristoff E, Larsson A. Inborn errors in the metabolism of glutathione. OrphanetJ Rare Dis. 2007 Mar 30;2:16. Review.
- Wu G, Fang YZ, Yang S, Lupton JR, Turner ND. Glutathione metabolism and itsimplications for health. J Nutr. 2004 Mar;134(3):489-92. Review.
