We undertook the biochemical and molecular characterization of hemophilia in a large pedigree of German wirehaired pointers. Males affected with hemophilia B had approximately 5% normal Factor IX coagulant activity and a proportional reduction of Factor IX protein concentration, indicative of a mild hemophilia B phenotype. Using Southern blot analyses and PCR amplification of genomic DNA, we discovered a large, 1.5-kb insertion in intron 5 of the Factor IX gene of an affected male. The insert consists of a 5′ truncated canine Line-1 followed by an approximately 200-bp 3′ poly (A) tract, flanked by a 15-bp direct repeat. The insert can be traced through at least five generations and segregates with the hemophilia B phenotype in this breed. This is the first description of a Factor IX mutation associated with mild hemophilia B in a non-human species and provides evidence for a recent Line-1 insertion event in the canine genome.
Mammalian Genome – Springer Journals
Published: Jan 1, 2003
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