Molecular Biological Aspects of Inhibitor Development

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Abstract
Mutation genotype studies have led to a number of interesting observations about the role of the different types of mutations in inhibitor development. Searchable information on mutations, phenotype data, models, etc., are available on the internet at http://europium.mrc.rpms.ac.uk. A relatively high incidence of inhibitors occurs in patients with deletion mutations. Stop mutations are also associated with a high incidence of inhibitors, although there is anomalous distribution of the inhibitors associated with different stop codons. Inhibitors have been associated with a small number of missense mutations. Missense mutations are of great interest from the structure/function viewpoint; in many instances, a missense mutation which results in reduced function of a circulating protein can be mapped onto a model structure and inferences can be made about the effects on the functionality of the protein. A model of the A domains of FVIII is available, but as yet, no structure is available on which to model the C domain of FVIII. Stop codons appear to have a different incidence of inhibitor formation compared to other types of mutations. It is concluded that while genotype mutation studies have led to a number of interesting observations about the role of the different types of mutations in inhibitor development, though more questions have been raised than answers provided to date.

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