• C. R. Seances Soc. Biol. Fil. · Jan 1979

    [Clinical and biological forms of cytochrome b5 reductase deficiency].

    • J C Kaplan, A Leroux, and P Beauvais.
    • C. R. Seances Soc. Biol. Fil. 1979 Jan 1; 173 (2): 368-79.

    AbstractTwenty-four personal cases of recessive congenital methemoglobinemia (RCM) due to cytochrome b5 reductase deficiency are analysed. They can be divided into two categories: 1) RCM type I, in which cyanosis is the single clinical symptom; 2) RCM type II in which cyanosis is associated with severe mental retardation and bilateral athetosis. The enzyme deficiency is restricted to the red cell soluble cytochrome b5 reductase in RCM type I, whereas in the type II form the enzyme defect is generalized to all tissues, involving both the soluble and the microsomal forms of cytochrome b5 reductase. Different mutations occurring at the same locus might account for this heterogeneity. However the mechanism of brain damage in case of generalized deficiency of cytochrome b5 reductase is still unknown.

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