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In the course of analysing mutation in the factor IX gene from 200 haemophilia B patients in Sweden and the UK, we have identified one patient with a prepeptide missense mutation. He has severe, antigen negative haemophilia, and complete analysis of his coding sequence reveals a single base transversion (A-->T) causing substitution of isoleucine by asparagine at position -30. This change disrupts the hydrophobic core of the prepeptide, a feature which is required for secretion. Thus, haemophilia in this patient is caused by a failure to secrete factor IX from the hepatocytes.
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