Good news! They have located the DNA marker in Coton for Banderas Syndrome. More information will be coming soon. Please read below:

It has taken a while, but if you keep walking you get there eventually. We have found the mutation responsible for Bandera’s syndrome in Coton de Tulears. It is quite an interesting gene that explains a lot about why we see the signs we do in the Bandera’s pups. We will be offering a DNA test for the mutation shortly so breeders can identify carriers of the trait and avoid any Bandera’s pups in the future. My colleague, Dr. Gary Johnson, is the one who does the real work on these studies and he will be getting in contact with you to let you know the details about testing.

Dennis O'Brien DVM PhD
Professor of Neurology
College of Veterinary Medicine
University of Missouri