Homocystinuria: Studies on cystathionine β‐synthase,S‐adenosylmethionine synthetase and cystathionase activities in skin fibroblasts

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Abstract
Cystathionine β-synthase,S-adenosylmethionine synthetase and cystathionase activities were assayed in skin fibroblast cultures from five pyridoxine responsive and five pyridoxine non-responsive homocystinurics, six obligate heterozygotes for homocystinuria and ten normal control subjects. The specific deficiency in cystathionine β-synthase activity was confirmed in nine of the homocystinuric cultures. However, in one pyridoxine responsive case the level of cystathionine β-synthase activity was found to be comparable with those of the heterozygotes. A negative correlation appeared to exist between the level of residual enzyme activity and the pre-treatment severity of clinical symptoms.