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Non-expression of a common mutation in the 21-hydroxylase gene: implications for prenatal diagnosis and carrier testing.
  1. G Rumsby,
  2. A F Massoud,
  3. C Avey,
  4. C G Brook
  1. Department of Chemical Pathology, UCL Hospitals, London, UK.

    Abstract

    Mutation analysis in the family of a child with 21-hydroxylase deficiency showed that the father and affected child were homozygous for a mutation, A/C655G, believed to activate a cryptic splice site in intron 2 of the 21-hydroxylase gene. The father, who was clinically asymptomatic, showed no biochemical evidence of disease. These results create problems for the management of future pregnancies in such families and for the interpretation of the risk associated with carrier status for this mutation.

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