Classic homocystinuria is an autosomal recessive metabolic disease due to a cystathionine-β-synthase deficiency with consequent blocking of homocysteine and serine condensation for producing cystathionine. The characteristic biochemical abnormalities in the blood and urine are: abnormal accumulation of methionine, abnormal presence of homocystine and low values of cystathionine, cysteine or cystine (disulfide of the cysteine). The most frequent clinical signs are: subluxation of the lenses, mental retardation of different degrees, long bones excessively lengthened, scoliosis, susceptibility to arterial and venous thromboembolism. The latter is frequent after surgery, and may be life-threatening. This disease must be differentiated from Marfan’s syndrome via laboratory tests.

Keywords:
Homocystinuria, Cystathionine-β-synthase, Methionine, Cystine
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© 1989 S. Karger AG, Basel
1989
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