Evolutionary genomics of dog domestication.

Area of Science:

• Genomics
• Evolutionary Biology
• Animal Genetics

Background:

• Domestic dogs exhibit remarkable phenotypic diversity, shaped by evolutionary processes during domestication.
• Understanding the genetic underpinnings of dog breed diversification is crucial for evolutionary studies.

Purpose of the Study:

• To review genomic study principles and tools for understanding dog domestication.
• To elucidate the genetic mechanisms driving canine diversity and infer ancestral origins.

Main Methods:

• Analysis of genetic mutations and their fixation across dog lineages.
• Haplotype-sharing analyses between domestic dogs and gray wolves.
• Sequencing of specific genes, such as IGF1, involved in trait selection.

Main Results:

• Two primary modes of dog evolution identified: fixation of large-effect mutations and selective breeding within functional groups.
• Dog nuclear genomes predominantly derive from Middle Eastern or European wolves, aligning with archaeological evidence.
• A black coat color mutation originating in dogs has impacted North American gray wolf populations.

Conclusions:

• Dog diversification is driven by a combination of major gene mutations and targeted selective breeding.
• The primary wolf ancestry of domestic dogs is European or Middle Eastern.
• Domestication-driven mutations can influence wild relative populations.