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Genome-wide association study (GWAS) is a powerful tool for identifying the genetic causes of various diseases. This study was conducted to identify genomic variation in Maltese dog genomes associated with degenerative mitral valve disease (DMVD) development and to evaluate the association of each biological condition with DMVD in Maltese dogs. DNA was extracted from blood samples obtained from 48 Maltese dogs (32 with DMVD and 16 controls). Genome-wide single nucleotide polymorphism (SNP) genotyping was performed. The top 30 SNPs from each association of various conditions and genetic variations were mapped to their gene locations. A total of 173,662 loci were successfully genotyped, with an overall genotype completion rate of 99.41%. Quality control analysis excluded 46,610 of these SNPs. Manhattan plots were produced using allelic tests with various candidate clinical conditions. A significant peak of association was observed between mitral valve prolapse (MVP) and SNPs on chromosome 17. The present study revealed significant SNPs in several genes associated with cardiac function, including PDZ2 , Armadillo repeat protein detected in velo-cardio-facial syndrome, catenin (cadherin-associated protein) alpha 3, low-density lipoprotein receptor class A domain containing protein 4, and sterile alpha motif domain containing protein 3. To our knowledge, this is the first study of a genetic predisposition to DMVD in Maltese dogs. Although only a limited number of cases were analyzed, these data could be the basis for further research on the genetic predisposition to MVP and DMVD in Maltese dogs.

Genome-wide association study of degenerative mitral valve disease in Maltese dogs