A large deletion in the GP9 gene in Cocker Spaniel dogs with Bernard-Soulier syndrome.

Gentilini, Fabio; Turba, Maria Elena; Giancola, Fiorella; Chiocchetti, Roberto; Bernardini, Chiara; Dajbychova, Markéta; Jagannathan, Vidya; Drögemüller, Michaela; Drögemüller, Cord (2019). A large deletion in the GP9 gene in Cocker Spaniel dogs with Bernard-Soulier syndrome. PLoS ONE, 14(9), e0220625. Public Library of Science 10.1371/journal.pone.0220625

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Inherited bleeding disorders including abnormalities of platelet number and function rarely occur in a variety of dog breeds, but are probably underdiagnosed. Genetically characterized canine forms of platelet disorders provide valuable large animal models for understanding similar platelet disorders in people. Breed-specific disease associated genetic variants in only eight different genes are known to cause intrinsic platelet disorders in dogs. However, the causative genetic variant in many dog breeds has until now remained unknown. Four cases of a mild to severe bleeding disorder in Cocker Spaniel dogs are herein presented. The affected dogs showed a platelet adhesion defect characterized by macrothrombocytopenia with variable platelet counts resembling human Bernard-Soulier syndrome (BSS). Furthermore, the lack of functional GPIb-IX-V was demonstrated by immunocytochemistry. Whole genome sequencing of one affected dog and visual inspection of the candidate genes identified a deletion in the glycoprotein IX platelet (GP9) gene. The GP9 gene encodes a subunit of a platelet surface membrane glycoprotein complex; this functions as a receptor for von Willebrand factor, which initiates the maintenance of hemostasis after injury. Variants in human GP9 are associated with Bernard-Soulier syndrome, type C. The deletion spanned 2460 bp, and included a significant part of the single coding exon of the canine GP9 gene on dog chromosome 20. The variant results in a frameshift and premature stop codon which is predicted to truncate almost two-thirds of the encoded protein. PCR-based genotyping confirmed recessive inheritance. The homozygous variant genotype seen in affected dogs did not occur in 98 control Cocker Spaniels. Thus, it was concluded that the structural variant identified in the GP9 gene was most likely causative for the BSS-phenotype in the dogs examined. These findings provide the first large animal GP9 model for this group of inherited platelet disorders and greatly facilitate the diagnosis and identification of affected and/or normal carriers in Cocker Spaniels.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)

UniBE Contributor:

Jagannathan, Vidya; Drögemüller, Michaela and Drögemüller, Cord

Subjects:

500 Science > 590 Animals (Zoology)
600 Technology > 630 Agriculture
500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1932-6203

Publisher:

Public Library of Science

Language:

English

Submitter:

Cord Drögemüller

Date Deposited:

16 Sep 2019 14:50

Last Modified:

03 Nov 2019 01:34

Publisher DOI:

10.1371/journal.pone.0220625

PubMed ID:

31484196

BORIS DOI:

10.7892/boris.133145

URI:

https://boris.unibe.ch/id/eprint/133145

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