OMIA 000438-9685 : Haemophilia B in Felis catus

In other species: dog , horse , pig

Possibly relevant human trait(s) and/or gene(s) (MIM number): 306900

Mendelian trait/disorder: yes

Mode of inheritance: X-linked

Considered a defect: yes

Key variant known: yes

Year key variant first reported: 2005

Cross-species summary: Also called factor IX deficiency or Christmas disease. This is one of the two X-linked bleeding disorders, haemophilia A being the other. The fact that these two disorders are X-linked in all species reported to date provides strong support for Ohno's suggestion that the X chromosome has been highly conserved throughout evolution.

Molecular basis: By sequencing an obvious candidate gene (F9), Goree et al. (2005) reported different causative mutations in two affected cats: "Affected cat 1 had a single nucleotide change in exon 8 at the 1st nucleotide position of the codon encoding an arginine (CGA to TGA) at amino acid position 338. This mutation would be predicted to result in the appearance of a premature stop codon in the portion of the gene encoding much of the catalytic domain of the protein. Affected cat 2 had a single nucleotide change in exon 4 at the 2nd nucleotide position of the codon encoding amino acid 82 (TGT to TAT), which would be predicted to result in the substitution of a tyrosine for a cysteine. This substitution would likely result in disruption of a disulfide bond crucial to normal protein structure and function"

Associated gene:

Symbol Description Species Chr Location OMIA gene details page Other Links
F9 coagulation factor IX Felis catus X NC_018741.3 (117080317..117111828) F9 Homologene, Ensembl, NCBI gene


By default, variants are sorted chronologically by year of publication, to provide a historical perspective. Readers can re-sort on any column by clicking on the column header. Click it again to sort in a descending order. To create a multiple-field sort, hold down Shift while clicking on the second, third etc relevant column headers.

WARNING! Inclusion of a variant in this table does not automatically mean that it should be used for DNA testing. Anyone contemplating the use of any of these variants for DNA testing should examine critically the relevant evidence (especially in breeds other than the breed in which the variant was first described). If it is decided to proceed, the location and orientation of the variant sequence should be checked very carefully.

Breed(s) Variant Phenotype Gene Allele Type of Variant Reference Sequence Chr. g. or m. c. or n. p. Verbal Description EVA ID Year Published PubMed ID(s) Acknowledgements
Haemophilia B F9 nonsense (stop-gain) c.??C>T p.R338* 2005 15822564
Domestic Longhair Haemophilia B F9 missense c.??G>A p.C82Y 2005 15822564


Note: the references are listed in reverse chronological order (from the most recent year to the earliest year), and alphabetically by first author within a year.
2005 Goree, M., Catalfamo, JL., Aber, S., Boudreaux, MK. :
Characterization of the mutations causing hemophilia B in 2 domestic cats. J Vet Intern Med 19:200-4, 2005. Pubmed reference: 15822564.
1993 Maggioprice, L., Dodds, W.J. :
Factor IX Deficiency (Hemophilia B) in a Family of British Shorthair Cats Journal of the American Veterinary Medical Association 203:1702-1704, 1993. Pubmed reference: 8307821.
1988 Boudreaux, MK., Dillon, AR. :
The Effect of Danazol Treatment on Factor IX Deficiency in Cats. Vet Clin Pathol 17:84-5, 1988. Pubmed reference: 15162324.
Fogh, J.M., Fogh, I.T. :
Inherited coagulation disorders. Vet Clin North Am Small Anim Pract 18:231-43, 1988. Pubmed reference: 3282382.

Edit History

  • Created by Frank Nicholas on 18 Sep 2005
  • Changed by Frank Nicholas on 09 Dec 2011
  • Changed by Frank Nicholas on 03 Dec 2012