Complex disease and phenotype mapping in the domestic dog

Area of Science:

• Veterinary genetics
• Comparative genomics
• Medical genetics

Background:

• The domestic dog is a valuable model organism in medical genetics.
• Canine studies offer insights into human diseases, including cancer and orthopaedic conditions.

Purpose of the Study:

• To conduct the largest canine genome-wide association study (GWAS) to date.
• To accelerate the identification of genetic loci associated with complex canine diseases and morphological traits.

Main Methods:

• Genotyping over 4,200 dogs at 180,000 markers.
• Performing genome-wide association studies for complex diseases and quantitative traits.

Main Results:

• Identified significant loci associated with hip dysplasia, elbow dysplasia, idiopathic epilepsy, lymphoma, mast cell tumor, and granulomatous colitis.
• Reported three novel quantitative trait loci influencing body size and one influencing fur length and shedding.
• Simulation studies indicate that larger sample sizes and denser marker sets can identify most moderate- to large-effect complex disease loci.

Conclusions:

• The study provides a framework for efficient genetic mapping of canine complex diseases.
• Canine genetic studies can be achieved with fewer samples than human studies, given appropriate design.
• Findings advance understanding of canine genetics and have implications for human disease research due to shared genetic architecture.