00420-A: Factor VIII Marker Genotyping for Hemophilia A Carrier Detection in Golden Retrievers

Grant Status: Closed

Grant Amount: $6,480
Dr. Marjory B. Brooks, DVM, Cornell University
July 1, 2004 - June 30, 2005
Breed(s): Golden Retriever
Research Program Area: Treatment

Abstract

This study aims to prevent propagation of Hemophilia A (Factor VII deficiency) in Golden Retrievers through application of molecular diagnostic techniques. Familial transmission of Hemophilia A has been recently recognized in this breed. Preliminary screening confirmed the diagnosis of Hemophilia A in more than a dozen males having clinical signs of a mild to moderate severity bleeding diathesis. Recruitment for the proposed study will focus on the offspring, parents, and siblings of obligate and suspect carrier females. The test protocol will combine Factor VIII coagulation assays with genotyping for an intragenic Factor VIII marker in order to enhance the accuracy of female carrier detection. The genetic status of males will be assigned based on direct measurement of Factor VIII coagulant activity, allowing identification of the marker allele segregating with hemophilia. Females� carrier status will be assigned through pedigree review and linkage based on their genotype at the Factor VIII marker locus. This strategy will enable owners and breeders to preserve the desirable traits in a line affected with hemophilia while avoiding the unwitting use of asymtomatic males or carrier females.

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