Researchers at the University of California, Davis, have recently identified a genetic mutation associated with the disorder cerebellar abiotrophy (CA). This debilitating neurologic disorder causes the degeneration of the cerebellum, and mainly affects Arabian horses.

The cerebellum is the part of the brain that plays an important role in the integration of sensory perception, coordination, and motor control. Cerebellar abiotrophy results from the loss of a specific type of neuron (known as Purkinje cells) in the cerebellum, causing head tremors and a lack of balance equilibrium, among other neurologic deficits. Unfortunately, there is no treatment. The more severely-affected foals are routinely euthanized before adulthood because of the risk they pose to themselves and others.

Cecilia Penedo, PhD, of the UC Davis Veterinary Genetics Laboratory, along with Leah Brault, PhD, who worked on the CA project during her doctoral studies, were recently able to identify a mutation in the DNA of horses with CA that they believe could be responsible for causing the disorder.

"The mutation we've identified is in a location of two overlapping genes," Penedo said. "It's an interesting feature of the DNA architecture in that region