Resumen

CARBAJAL-RODRIGUEZ, Luis et al. Homocystinuria: Report of 2 patients. Bol. Med. Hosp. Infant. Mex. [online]. 2006, vol.63, n.5, pp.326-331. ISSN 1665-1146.

Introduction. Homocystinuria is a metabolic disorder of methionine which results elevated homocysteine, visual, central nervous system, cardiovascular system and skeletal disturbances, and the second most frequent amino acid disorder after phenylcetonuria. It is a recessive autosomic hereditary condition. The defect is located in chromosome 21q22-3. Incidence: 1:300 000 to 1:60 000. Case reports. Two girls ages 9 and 11 years presented with mental retardation, loss of visual acuity and of motor activity; lens sub luxation, nistagmus, ataxia and positive Romberg's sign. Metabolic screening: Case 1: methionine, 1 194 ng/mL (normal, 7-47 ng/mL); B12, 1 167 pg/mL (normal, 120-960 pg/mL); folates, 20-7.2 ng/mL (normal, 3-17 ng/mL). Case 2: methionine, 180-1 740; vitamin B12, 1 749; folates 3 (normal 3-17 ng/mL). Treatement: pyridoxine, folates, vitamin C, B12 and aspirin. The clinical course of these patients has been stable. Conclusion. Early diagnosis of homocystinuria prevents complications.

Palabras llave : Homocystinuria; methionine; homocysteine; Marfan's syndrome.