Equine Neuroaxonal Dystrophy and Degenerative Myeloencephalopathy.

The research focuses on the neurodegenerative diseases in horses, known as equine neuroaxonal dystrophy (eNAD) and equine degenerative myeloencephalopathy (EDM). The study showcases the clinical signs and characteristics of the diseases, their diagnostic methods, potential inheritance, and the role of vitamin E in affecting the severity of the diseases.

Identification and Characteristics of Equine Neurodegenerative Diseases

• The research focuses on two related diseases in horses – equine neuroaxonal dystrophy (eNAD) and equine degenerative myeloencephalopathy (EDM). The former condition is characterized by pathological lesions that are localized to the brainstem, while in the latter, the degenerative changes can be found throughout the spinal cord.
• Despite being distinct diseases, both conditions result in a similar clinical outcome, most notably ataxia, which typically develops subtly during the early stages of the disease. Ataxia is a type of movement disorder characterized by a lack of voluntary coordination.
• In some cases, these diseases may present later in life and cause behavior changes alongside other clinical signs.

Diagnosis of eNAD/EDM

• A definitive diagnosis of eNAD or EDM requires histological evaluation, a technique that involves the microscopic examination of cellular tissue.
• The specific areas of examination for these diseases are the caudal medulla, which is the lowermost part of the brainstem, and the cervicothoracic spinal cord, which spans the neck and upper back region.

Inheritance and Role of Vitamin E in eNAD/EDM

• The study suggests that eNAD/EDM is likely to be an inherited disorder, meaning that it’s passed down genetically from parents to offspring.
• Vitamin E is identified as a significant factor that determines the overall severity of the disease. This connection introduces the concept of environmental modifiers in genetics, implying that certain environmental factors, such as diet, can interact with an individual’s genes and contribute to the expression of inherited diseases.