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Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)

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Single-nucleotide-polymorphism-based association mapping of dog stereotypes.

Paul Jones¹, Kevin Chase, Alan Martin

¹The WALTHAM Centre for Pet Nutrition, Waltham on the Wolds, Leicsestershire LE14 4RT, United Kingdom.

|May 29, 2008

Summary

Researchers identified genetic loci linked to dog breed stereotypes, including size, behavior, and longevity. This study utilized DNA from 148 breeds to pinpoint specific genetic markers associated with these traits.

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Area of Science:

Genetics
Animal Science
Canine Genomics

Background:

Phenotypic stereotypes in dogs (Canis familiaris) are polygenic traits shaped by stringent selection for breed standards.
Breed standards dictate conformation and performance (behavioral) traits, making individual measurements representative of the breed stereotype.
Understanding the genetic basis of these stereotypes is crucial for canine genetics and breeding research.

Purpose of the Study:

To associate single nucleotide polymorphism (SNP) markers with breed stereotypes using DNA samples from 148 dog breeds.
To identify quantitative trait loci (QTL) associated with various phenotypic stereotypes, including morphology, behavior, and longevity.
To explore the potential of this approach for identifying loci regulating polygenic diseases within dog breeds.

Main Methods:

Genomic DNA was isolated from 148 distinct dog breeds.
SNP markers were analyzed to identify associations with breed stereotypes, using dog size as an initial test trait.
Statistical analyses were performed to identify significant QTL and candidate genes related to selected traits.

Main Results:

Six significant QTL on five chromosomes were identified for dog size, including candidate genes like IGF1 and SMAD2.
Numerous additional significant loci were found for other morphological and behavioral stereotypes (herding, pointing, boldness, trainability).
Four significant loci were associated with longevity, inversely correlated with breed size, suggesting a complex genetic architecture.

Conclusions:

The study successfully demonstrates an approach to associate SNP markers with complex phenotypic stereotypes in dogs.
Identified QTL provide insights into the genetic regulation of diverse traits, from physical morphology to behavior and lifespan.
This methodology holds promise for future research into the genetic underpinnings of canine diseases and breed-specific traits.