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Selection signatures in Shetland ponies.

M Frischknecht1,2,3, C Flury3,4, T Leeb2,3

  • 1Agroscope, Swiss National Stud Farm, Les Longs-Prés, 1580, Avenches, Switzerland.

Animal Genetics
|February 10, 2016
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Summary
This summary is machine-generated.

Researchers identified a genetic selection signature on equine chromosome 1 in Shetland ponies, potentially linked to their small stature. This region contains genes like IGF1R and ADAMTS17, known to influence body height.

Keywords:
Composite Selection ScoreHorse

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Area of Science:

  • Animal Genetics
  • Comparative Genomics
  • Equine Science

Background:

  • Shetland ponies are renowned for their small stature, strength, and hardiness, traits resulting from selective breeding.
  • Understanding the genetic basis of these traits is crucial for equine genetics and breeding programs.

Purpose of the Study:

  • To identify genetic regions under selection in Shetland ponies associated with their distinctive traits.
  • To investigate the role of specific genes, such as IGF1R and ADAMTS17, in Shetland pony's small stature.

Main Methods:

  • Genome-wide single nucleotide polymorphism (SNP) analysis was performed on 75 Shetland ponies and 76 large-sized horses.
  • Selection signature analysis was conducted to pinpoint genomic regions with significant differences between the two groups.
  • Homozygosity mapping was used to identify regions of increased homozygosity within the Shetland pony population.

Main Results:

  • A significant selection signature was detected on equine chromosome 1 (ECA1) between 103.8 Mb and 108.5 Mb.
  • This region encompasses 33 annotated genes, including IGF1R and ADAMTS17, known to influence body height.
  • Increased homozygosity was observed in Shetland ponies between 107.4 Mb and 108.5 Mb on ECA1, though genes in this specific sub-region are not yet linked to height.

Conclusions:

  • The identified selection signature on ECA1 suggests strong selective pressure in Shetland ponies, likely related to their small stature.
  • While IGF1R and ADAMTS17 are potential candidates, the association of the specific homozygous region with height remains uncertain.
  • Further research is needed to confirm the exact genetic factors responsible for the unique traits of Shetland ponies, as other selected traits cannot be ruled out.