HOMOCYSTINURIA
\hˌɒməsˌɪstɪnjˈʊɹi͡ə], \hˌɒməsˌɪstɪnjˈʊɹiə], \h_ˌɒ_m_ə_s_ˌɪ_s_t_ɪ_n_j_ˈʊ_ɹ_iə]\
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An autosomal recessive inborn error of methionine metabolism usually caused by a deficiency of CYSTATHIONINE BETA-SYNTHASE and associated with elevations of homocysteine in plasma and urine. Clinical features include a tall, slender habitus, SCOLIOSIS, arachnodactyly, MUSCLE WEAKNESS, genu varis, thin blond hair, malar flush, lens dislocations, an increased incidence of MENTAL RETARDATION, and a tendency to develop fibrosis of arteries, frequently complicated by CEREBROVASCULAR ACCIDENTS and MYOCARDIAL INFARCTION. (From Adams et al., Principles of Neurology, 6th ed, p979)
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