Testing Available for Dwarfism Gene in Miniature Horses

The University of Kentucky Animal Genetic Testing and Research Laboratory is now offering DNA-based tests for four mutations in the aggrecan gene associated with dwarfism in Miniature Horses.
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Testing Available for Dwarfism Gene in Miniature Horses
An example of normal Miniature Horse conformation. | Photo: Thinkstock
The University of Kentucky Animal Genetic Testing and Research Laboratory (AGTRL) is now offering DNA-based tests for four mutations in the aggrecan gene (ACAN) associated with dwarfism in Miniature Horses. John Eberth, MS, a PhD student of Ernie Bailey, PhD, professor in genetics and genomics at the UK Gluck Equine Research Center, discovered the mutations.

It is important to note that these mutations are not associated with another type of dwarfism known as skeletal atavism seen in Miniature Horses and Shetland Ponies. The ACAN mutations are also not associated with the osteochondrodysplasia dwarfism found in some breeds such as Friesians.

A horse that is a carrier for any one of the four ACAN mutations appears to be normal and does not exhibit any dwarf traits. Because carriers have the normal phenotype (physical characteristics), it is important to test breeding stock for these mutations to avoid matings that might produce a dwarf or aborted/absorbed fetus. One of these mutations (D1) is lethal in combination with any of the other mutations and will cause early pregnancy loss. Breeders should also avoid mating two horses that are carriers for the other ACAN mutations, as two mutations in any combination will produce a dwarf foal with a range of physical ailments. Some of these defects seriously affect the horse’s health and include breathing problems, malformed mouths that cause eating difficulties, and abnormal bone growth leading to chronic soundness issues.

The four identified mutations are designated D1, D2, D3, and D4. The normal copy of the gene is designated as N

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