The phenotypic range of hemophilia A carriers (original) (raw)

The American Journal of Human Genetics

Abstract

We have described the study of a small kindred with X-linked hemophilia A. It was ascertained through a clinically affected female, the daughter of a man with moderately severe hemophilia. The pedigree and the proband's phenotype suggest that she may be a heterozygote in whom most of the normal alleles at the VIII-1 locus are not active. She has two sisters, also obligatory carriers. The three sisters exhibit the three phenotypes possible for heterozygous females: clinically affected, clinically normal but phenotypically abnormal as determined by laboratory tests, and clinically and phenotypically normal.

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