Sandhoff disease in a golden retriever dog

Area of Science:

• Biochemistry
• Neuroscience
• Veterinary Medicine

Background:

• Sandhoff disease is a rare, fatal neurodegenerative lysosomal storage disorder.
• It is caused by mutations in the HEXB gene, leading to a deficiency in beta-hexosaminidase.
• GM2-gangliosidosis results from the accumulation of GM2 gangliosides in neurons.

Observation:

• A golden retriever exhibited clinical signs consistent with a lysosomal storage disorder.
• Diagnostic tests revealed a complete deficiency of hexosaminidase activity.
• Cerebrospinal fluid analysis showed significantly elevated levels of GM2-gangliosides.

Findings:

• The dog's biochemical profile mirrors the enzymatic defect and substrate accumulation seen in human Sandhoff disease.
• Genetic analysis confirmed the absence of functional hexosaminidase B and/or A subunits.
• This specific canine case presents a naturally occurring model for studying Sandhoff disease pathogenesis.

Implications:

• This canine model offers a unique opportunity for preclinical research into Sandhoff disease.
• It can facilitate the development and testing of novel therapeutic strategies, including enzyme replacement and gene therapy.
• Understanding the disease progression in this animal model can provide insights into human neurological manifestations.