Chromosome 23 of the horse genome contains a mutation that has an effect on the gait and coordination of horses.
Owners of the following breeds would have an interest in having this region sequenced.
American Saddlebred Miniature Horse
Bashkir Curly
Coldblooded Trotters
Colombian Horse
Icelandic Horses
Kentucky Mountain Horse
Mangalarga
Tennessee Walking Horse
Missouri Foxtrotter
Morgan Horse
Paint Horse
Paso Fino
Peruvian Horse
Quarter Horse
Standardbreds
Trocha
Trocha y Galope
Trote y Galope
Reference:
Andersson LS, Larhammar M, Memic F, Wootz H et al. (2012) Mutations in DMRT3 affect locomotion in horses and spinal circuit function in mice. Nature 488(7413):642-6.