Homocystinuria due to CBS deficiency
Other Names for this Disease
- CBS deficiency
- Cystathionine beta-synthase deficiency
- Homocystinuria due to cystathionine beta-synthase deficiency
Homocystinuria due to CBS deficiency is an inherited disorder in which the body is unable to process certain building blocks of proteins (amino acids) properly. This form of homocystinuria is caused by the lack of an enzyme called cystathionine beta-synthase, which results from a mutation in the CBS gene. It is characterized by dislocation of the lens in the eye, an increased risk of abnormal blood clots, and skeletal abnormalities. Problems with development and learning are also evident in some cases. Homocystinuria due to CBS deficiency is inherited in an autosomal recessive pattern. Treatment aims to correct the biochemical abnormalities, especially to control blood homocystine concentration and prevent thrombosis (blood clots). Vitamin B6 (pyridoxine) therapy, protein-restricted and methionine-restricted diets, betaine treatment, and/or folate and vitamin B12 supplementation may be used to manage the condition.
- Homocystinuria. Genetics Home Reference (GHR). http://www.ghr.nlm.nih.gov/condition=homocystinuria. Accessed March 16, 2011.
- Picker JD, Levy HL. Homocystinuria Cuased by Cystathionine Beta-Synthase Deficiency. GeneReviews. http://www.ncbi.nlm.nih.gov/books/NBK1524/. Accessed March 16, 2011.
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- The Screening, Technology And Research in Genetics (STAR-G) Project has a fact sheet on this condition, which was written specifically for families that have received a diagnosis as a result of newborn screening. This fact sheet provides general information about the condition and answers questions that are of particular concern to parents. To view this fact sheet, click on the link.
- The The Online Mendelian Inheritance in Man (OMIM) database contains genetics resources that discuss Homocystinuria due to CBS deficiency. Click on the link to go to OMIM and review these resources.