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Homocystinuria: studies on cystathionine beta-synthase, S-adenosylmethionine synthetase and cystathionase activities in skin fibroblasts
Journal article   Peer reviewed

Homocystinuria: studies on cystathionine beta-synthase, S-adenosylmethionine synthetase and cystathionase activities in skin fibroblasts

A.H. Bittles and N.A. Carson
Journal of Inherited Metabolic Disease, Vol.4(1), pp.3-6
1981
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Abstract

Cystathionine beta-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 beta-synthase activity was confirmed in nine of the homocystinuric cultures. However, in one pyridoxine responsive case the level of cystathionine beta-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.

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