Factor VIII gene mutations found by a comparative study of SSCP, DGGE and CMC and their analysis on a molecular model of factor VIII protein

Human Genetics
R SchwaabK Michaelides

Abstract

Screening of the factor VIII (FVIII) gene which spans 186 kb and codes for 26 exons, was originally hampered by its size but is now feasible because rapid DNA scanning methodologies have been developed. The present study for the first time directly compares the three most widely applied screening methods, denaturing gradient gel electrophoresis (DGGE), single-stranded conformational polymorphism (SSCP) and chemical mismatch cleavage (CMC) for their sensitivity of mutation detection in a selected group of ten haemophilia A patients. Nine of these patients are known to be cross-reacting material positive and eight exhibited a mild to moderate phenotype. Of the ten patients screened, we identified mutations in nine by all three screening methods. Of the mutations characterised, two are previously unpublished. T to C (S373P) and G to A (D525N). In one mildly affected haemophiliac, we identified a second T to C sequence change in the 5' untranslated region at -601 bp, probably having no effect on FVIII gene expression. Modelling studies were performed on those mutations lying within the A domains of FVIII (D525N, R527W, I566T) to study the possible effect of these mutations on structure and/or function. When the three methods are pe...Continue Reading

Citations

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