OMIA:002434-9615 : Thrombocytopenia, TUBB1-related in Canis lupus familiaris (dog)

Categories: Haematopoietic system phene

Links to possible relevant human trait(s) and/or gene(s) in OMIM: 612901 (gene) , 613112 (trait)

Mendelian trait/disorder: yes

Mode of inheritance: Autosomal recessive

Considered a defect: yes

Key variant known: yes

Inheritance: From segregation analysis of 16 families of Cavalier King Charles Spaniels [CKCS] in which this disorder was segregating, Pedersen et al. (2002) concluded that " idiopathic, asymptomatic thrombocytopenia in CKCS is inherited in an autosomal recessive manner. The condition most likely constitutes an inherited macrothrombocytopenia in dogs".

Molecular basis: Being aware of an earlier unpublished discovery by M.K. Boudreaux of a missense mutation in the TUBB1 gene (encoding beta1-tubulin) in several King Charles Cavalier Spaniels (CKCS) with macrothrombocytopenia, Davis et al. (2008) genotyped for this mutation in 100 CKCS dogs and 52 dogs from other breeds, for most of which platelet numbers and volume were recorded. They confirmed that a "missense mutation (c.745 G>A) in the gene encoding beta1-tubulin, predicted to result in the substitution of an asparagine for aspartic acid (D249N), correlated with the macrothrombocytopenia observed" (with thanks to Dr. Mario Van Poucke for identifying an error in an earlier version of this entry). Only one of the dogs from other breeds (a Labrador Retriever) had the same mutation (as a heterozygote). Gelain et al. (2014) reported a different missense mutation (c.5G>A; p.R2H) in the same gene (TUBB1) as the likely cause of a very similar disorder in Norfolk and Cairn Terriers.

Breeds: Cairn Terrier (Dog) (VBO_0200267), Cavalier King Charles Spaniel (Dog) (VBO_0200309), Norfolk Terrier (Dog) (VBO_0200945).
Breeds in which the phene has been documented. (If a likely causal variant has been documented for the phene, see the variant table breeds in which the variant has been reported).


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.

Since October 2021, OMIA includes a semiautomated lift-over pipeline to facilitate updates of genomic positions to a recent reference genome position. These changes to genomic positions are not always reflected in the ‘acknowledgements’ or ‘verbal description’ fields in this table.

OMIA Variant ID Breed(s) Variant Phenotype Gene Allele Type of Variant Source of Genetic Variant Reference Sequence Chr. g. or m. c. or n. p. Verbal Description EVA ID Year Published PubMed ID(s) Acknowledgements
98 Cairn Terrier (Dog) Norfolk Terrier (Dog) Thrombocytopaenia TUBB1 missense Naturally occurring variant CanFam3.1 24 g.43761303G>A c.5G>A p.(R2H) XM_022408906.1; XP_022264614.1 2014 25060661 Genomic coordinates in CanFam3.1 provided by Zoe Shmidt and Robert Kuhn.
81 King Charles Spaniel (Dog) Thrombocytopaenia TUBB1 missense Naturally occurring variant CanFam3.1 24 g.43766144G>A c.745G>A p.(D249N) XM_022408906.1; XP_022264614.1 rs1152388419 2008 18466252 Sequence information used to identify the genomic location was kindly provided by Mary K Boudreaux.

Cite this entry

Nicholas, F. W., Tammen, I., & Sydney Informatics Hub. (2021). OMIA:002434-9615: Online Mendelian Inheritance in Animals (OMIA) [dataset].


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.

2023 Meadows, J.R.S., Kidd, J.M., Wang, G.D., Parker, H.G., Schall, P.Z., Bianchi, M., Christmas, M.J., Bougiouri, K., Buckley, R.M., Hitte, C., Nguyen, A.K., Wang, C., Jagannathan, V., Niskanen, J.E., Frantz, L.A.F., Arumilli, M., Hundi, S., Lindblad-Toh, K., Ginja, C., Agustina, K.K., André, C., Boyko, A.R., Davis, B.W., Drögemüller, M., Feng, X.Y., Gkagkavouzis, K., Iliopoulos, G., Harris, A.C., Hytönen, M.K., Kalthoff, D.C., Liu, Y.H., Lymberakis, P., Poulakakis, N., Pires, A.E., Racimo, F., Ramos-Almodovar, F., Savolainen, P., Venetsani, S., Tammen, I., Triantafyllidis, A., vonHoldt, B., Wayne, R.K., Larson, G., Nicholas, F.W., Lohi, H., Leeb, T., Zhang, Y.P., Ostrander, E.A. :
Genome sequencing of 2000 canids by the Dog10K consortium advances the understanding of demography, genome function and architecture. Genome Biol 24:187, 2023. Pubmed reference: 37582787. DOI: 10.1186/s13059-023-03023-7.
2014 Gelain, M.E., Bertazzolo, W., Tutino, G., Pogliani, E., Cian, F., Boudreaux, M.K. :
A novel point mutation in the β1-tubulin gene in asymptomatic macrothrombocytopenic Norfolk and Cairn Terriers. Vet Clin Pathol 43:317-21, 2014. Pubmed reference: 25060661. DOI: 10.1111/vcp.12168.
2010 Gelain, M.E., Tutino, G.F., Pogliani, E., Bertazzolo, W. :
Macrothrombocytopenia in a group of related Norfolk terriers. Vet Rec 167:493-4, 2010. Pubmed reference: 20871084. DOI: 10.1136/vr.c4782.
2008 Davis, B., Toivio-Kinnucan, M., Schuller, S., Boudreaux, MK. :
Mutation in beta1-tubulin correlates with macrothrombocytopenia in Cavalier King Charles Spaniels. J Vet Intern Med 22:540-5, 2008. Pubmed reference: 18466252. DOI: 10.1111/j.1939-1676.2008.0085.x.
2005 Singh, MK., Lamb, WA. :
Idiopathic thrombocytopenia in Cavalier King Charles Spaniels. Aust Vet J 83:700-3, 2005. Pubmed reference: 16315671. DOI: 10.1111/j.1751-0813.2005.tb13055.x.
2004 Cowan, SM., Bartges, JW., Gompf, RE., Hayes, JR., Moyers, TD., Snider, CC., Gerard, DA., Craft, RM., Muenchen, RA., Carroll, RC. :
Giant platelet disorder in the Cavalier King Charles Spaniel. Exp Hematol 32:344-50, 2004. Pubmed reference: 15050744. DOI: 10.1016/j.exphem.2004.01.008.
2002 Pedersen, H.D., Haggstrom, J., Olsen, L.H., Christensen, K., Selin, A., Burmeister, M.L., Larsen, H. :
Idiopathic asymptomatic thrombocytopenia in Cavalier King Charles Spaniels is an autosomal recessive trait J Vet Intern Med 16:169-73, 2002. Pubmed reference: 11899033. DOI: 10.1892/0891-6640(2002)016<0169:iatick>;2.
1997 Smedile, L.E., Houston, D.M., Taylor, S.M., Post, K., Searcy, G.P. :
Idiopathic, asymptomatic thrombocytopenia in Cavalier King Charles Spaniels - 11 cases (1983-1993) J Am Anim Hosp Assoc 33:411-5, 1997. Pubmed reference: 9278116. DOI: 10.5326/15473317-33-5-411.
1994 Eksell, P., Haggstrom, J., Kvart, C., Karlsson, A. :
Thrombocytopenia in the Cavalier King Charles Spaniel. Journal of Small Animal Practice 35:153-155, 1994.

Edit History

  • Created by Imke Tammen2 on 26 Sep 2021
  • Changed by Imke Tammen2 on 26 Sep 2021