Breeding Selection for U.S. Siberian Huskies Has Altered Genes Regulating Metabolism, Endurance, Development, Body Conformation, Immune Function, and Behavior.
Level 5 - mechanism / opinion, no new human data
Non-human animal genomic and population study
PubMed 41300807 · doi:10.3390/genes16111355
What was done
Genomic analysis of 237 U.S. Siberian Huskies categorized by breeding purpose (sledding, show, or pet) using a whole-genome panel of 234K SNPs. Researchers analyzed population structure with morphometric measurements and genomic principal component analysis, assessed allelic variation using Wright's F_ST, and evaluated selective sweeps via runs of homozygosity (ROH). Gene Ontology and KEGG pathway analyses were used to characterize the biological roles of selected genomic regions.
What was found
Analysis identified 118 SNPs with significant allelic divergence (F_ST >= 0.6) and 22,598 ROH segments, including 91 distinct ROH islands indicating selective sweeps. Pet dogs showed selection for olfactory performance genes. Show dogs demonstrated selection for immune function, tissue and nervous system development, and cytoskeletal motor activity. Sledding dogs exhibited selection for glucose transport, lipid metabolism, lung vasculature, muscle organs, bone and limb development, eye structure, and pigmentation.
Why it matters
This study demonstrates that breeding for specialized roles (working performance, show conformation, or companionship) within a single dog breed drives functional genomic divergence across distinct physiological and metabolic pathways while maintaining overarching breed standards.
Limits
The study is limited to a canine sample from the United States (n = 237). The findings are observational genomic associations and selective sweep scans without direct functional, biochemical, or physiological validation. Specific morphometric effect sizes and detailed quantitative differences were not reported in the abstract.