DOI: 10.1101/486373Dec 3, 2018Paper

Christmas disease in a Hovawart family resembling human hemophilia B Leyden is caused by a single nucleotide deletion in a highly conserved transcription factor binding site of the F9 gene promoter

BioRxiv : the Preprint Server for Biology
Bertram BrenigTosso Leeb


Hemophilia B is a classical monogenic X-chromosomal recessively transmitted bleeding disorder caused by genetic variants within the coagulation factor IX gene (F9). Although hemophilia B has been described in 32 dog breeds hitherto, it has not yet been reported in the Hovawart. Here we describe the identification of a Hovawart family transmitting typical signs of an X-linked bleeding disorder. Five males had been reported to suffer from recurrent hemorrhagic episodes, four of them had to be euthanized finally and one died due to severe blood loss. A blood sample of one of these males with only 2% of the normal concentration of plasma factor IX (FIX) together with samples of seven relatives including the mother and grandmother were provided for further analysis. Next generation sequencing of DNA of the mother and grandmother revealed a single nucleotide deletion in the F9 promoter (NC_006621.3:g.109,501,492delC; CanFam3.1). Genotyping of the deletion in 1,298 dog specimens (83 different breeds) including 720 Hovawarts revealed that the mutation was only present in the aforementioned Hovawart family. The deletion is located 73 bp upstream of the F9 start codon in the highly conserved overlapping DNA binding sites of hepatocyte nu...Continue Reading

Related Concepts

Base Sequence
Hemophilia B
DNA Probes
Factor IX
Gene Deletion

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