PubMed · 5784757
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D I Feinstein, S I Rapaport. 1969-07-10. Hemophilia polymorphism--the genetic plot thickens.. https://doi.org/10.1056/nejm196907102810211
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Bleeding symptoms and clotting activity vary among mutations that alter mRNA splicing of either the factor VIII or factor IX genes. We analyzed splicing mutations in both genes for changes in individual information (R(i), in bits) involving both donor or acceptor sites. Mutations with low or negative R(i) values (<2.4 bits) or significant changes in R(i) (DeltaR(i) > or = 7 bits) exhibited either reduced protein activity, increased clotting time and bleeding frequency and were predictive of severe disease. Thus, information analysis of splicing mutations may be useful in predicting phenotypes in hemophilia.
A neonate who had intracranial haemorrhage (ICH) at birth received a diagnosis of severe haemophilia B at 6 months of age. ICH had been the initial presentation of his bleeding disorder. His family history was negative for haemophilia. Review of our institutional experience as well as the literature indicates that intracranial bleeding as the initial presentation of haemophilia is rare.
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