The Changing Landscape of Quarter Horse Genetics, Part 2

In Part 1 of this series, you were introduced to the research team from the University of Minnesota that analyzed the genetic diversity of six Quarter Horse performance subgroups: halter, western pleasure, reining, working cow horse, cutting and racing.

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The Changing Landscape of Quarter Horse Genetics, Part 1

Talk to an equine geneticist long enough, and you are bound to hear two assertions made about the American Quarter Horse breed that sound like opposites:

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Polysaccharide Storage Myopathy (PSSM)

Polysaccharide Storage Myopathy (PSSM) is a dominant autosomal hereditary condition that can cause a genetic form of tying-up with muscle damage and inability to move. One form of PSSM is in part a result of a single base pair substitution in GYS1 gene, thereby changing the amino acid sequence of the glycogen synthase enzyme. At least 20 breeds have been identified with Type 1 PSSM.

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