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. 2023 Dec 14;10(12):703.
doi: 10.3390/vetsci10120703.

Genomic Analysis of Lymphoma Risk in Bullmastiff Dogs

Sally A Mortlock  1 , Monica C Asada  1 , Pamela Xing Yi Soh  2   3 , Wei-Tse Hsu  1 , Carol Lee  1 , Peter F Bennett  1 , Rosanne M Taylor  1 , Mehar S Khatkar  1   4 , Peter Williamson  1
Affiliations

Genomic Analysis of Lymphoma Risk in Bullmastiff Dogs

Sally A Mortlock et al. Vet Sci. .

Abstract

Lymphoma is the most common haematological malignancy affecting dogs and has a high incidence in the Bullmastiff breed. The aim of this study was to identify risk loci predisposing this breed to the disease. The average age of lymphoma diagnosis in 55 cases was less than 6 years, similar to the median age of 64 cases from our clinical and pathology databases. When fine-scale population structure was explored using NETVIEW, cases were distributed throughout an extended pedigree. When genotyped cases (n = 49) and dogs from the control group (n = 281) were compared in a genome-wide association analysis of lymphoma risk, the most prominent associated regions were detected on CFA13 and CFA33. The top SNPs in a 5.4 Mb region on CFA13 were significant at a chromosome-wide level, and the region was fine-mapped to ~1.2 Mb (CFA13: 25.2-26.4 Mb; CanFam3.1) with four potential functional candidates, including the MYC proto-oncogene bHLH transcription factor (MYC) and a region syntenic with the human and mouse lncRNA Pvt1 oncogene (PVT1). A 380 Kb associated region at CFA33: 7.7-8.1 Mb contained the coding sequence for SUMO specific peptidase7 (SENP7) and NFK inhibitor zeta (NFKBIZ) genes. These genes have annotations related to cancer, amongst others, and both have functional links to MYC regulation. Genomic signatures identified in lymphoma cases suggest that increased risk contributed by the regions identified by GWAS may complement a complex predisposing genetic background.

Keywords: Bullmastiff; GWAS; canine; lymphoma.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Pedigree relationship matrix of lymphoma cases.
Figure 2
Figure 2
Age distribution of lymphoma cases of (A) this study and (B) data collected through clinical and pathology databases.
Figure 3
Figure 3
Relationship network based on genotypes of cases and control group dogs.
Figure 4
Figure 4
Manhattan plot of genome-wide SNP associations in lymphoma cases compared to the control group dogs. Threshold values represent q-values of 0.01 (blue) and 0.05 (red).
Figure 5
Figure 5
Regional plot of associated SNPs on CFA13.
Figure 6
Figure 6
Regional plot of associated SNPs on CFA33.
See this image and copyright information in PMC

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