On page 4 of his link
http://www.pnas.org/content/suppl/20...12297106SI.pdf you can see a movie about the different stages of DM, from mild ataxie which the dog doesn't hurt til severe problems and the end stage that also the front legs and the swallowing are affected, I don't think you want this to happen to YOUR dog ........
On this link you can read more scientific stuf about the test and the resembles whith a human disease
http://www.pnas.org/content/106/8/2794.full.pdf+html
My conclusion would be... make a wise decision with the knowledge you are provided.