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Pathway Description
Cystathionine beta-Synthase Deficiency
Homo sapiens
Disease Pathway
Created: 2013-08-01
Last Updated: 2022-11-22
Cystathionine Beta-Synthase Deficiency (CBS Deficiency; Homocystinuria) is an autosomal recessive disease caused by a mutation in the CBS gene which codes for cystathionine beta-synthase. A deficiency in this enzyme results in accumulation of L-cystathionine, homocysteine, and L-homocystine in plasma and urine; and L-methionine and ornithine in plasma. Symptoms include osteoporosis, myopia, fatty-liver, mental retardation, and early death. Treatment includes folic acid, vitamin B6, vitamin B12, and a methionine-restricted diet.
References
Cystathionine beta-Synthase Deficiency References
[Uniprot: P35520](http://www.uniprot.org/uniprot/P35520)
[OMIM: Entry 236200](http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=236200)
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Methionine Metabolism References
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Salway, J.G. Metabolism at a glance (3rd ed.) (2004). Alden, Mass.: Blackwell Pub.
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Pubmed: 8940272
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Pubmed: 8968737
Li YN, Gulati S, Baker PJ, Brody LC, Banerjee R, Kruger WD: Cloning, mapping and RNA analysis of the human methionine synthase gene. Hum Mol Genet. 1996 Dec;5(12):1851-8. doi: 10.1093/hmg/5.12.1851.
Pubmed: 8968735
Chen LH, Liu ML, Hwang HY, Chen LS, Korenberg J, Shane B: Human methionine synthase. cDNA cloning, gene localization, and expression. J Biol Chem. 1997 Feb 7;272(6):3628-34.
Pubmed: 9013615
Wang J, Hegele RA: Genomic basis of cystathioninuria (MIM 219500) revealed by multiple mutations in cystathionine gamma-lyase (CTH). Hum Genet. 2003 Apr;112(4):404-8. doi: 10.1007/s00439-003-0906-8. Epub 2003 Feb 6.
Pubmed: 12574942
Lu Y, O'Dowd BF, Orrego H, Israel Y: Cloning and nucleotide sequence of human liver cDNA encoding for cystathionine gamma-lyase. Biochem Biophys Res Commun. 1992 Dec 15;189(2):749-58. doi: 10.1016/0006-291x(92)92265-y.
Pubmed: 1339280
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Pubmed: 9790750
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Pubmed: 10338090
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Pubmed: 7903580
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Pubmed: 16710414
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