Neuronal Ceroid Lipofuscinosis 6, NCL 6

Common symptoms reflect central nervous system malfunction and include partial or total vision loss, behavior changes, abnormal gait, and seizures. Symptoms usually progress slowly over time.

Aussies with this form of NCL are reported to develop neurologic signs as around 18 months of age.

NCL is definitively diagnosed through genetic testing or examination of central nervous system (CNS) tissues after the affected dog is deceased. Clinical signs of this disease may mimic many other CNS diseases, so examination by a veterinarian or veterinary neurologist is required. Advanced imaging (CT or MRI scan) and/or spinal taps may be performed to rule out other diseases.

Currently, there is no treatment for NCL. While gene therapy trials in mouse models have proven promising, there is much more research required before it can be used in veterinary hospitals.

Talk to your vet about your dog’s NCL result so you can work together to plan ongoing care and monitoring. Note any changes in their coordination, mobility, or behavior.

Keep your dog’s environment calm and consistent. Use slings, harnesses, or supportive devices as needed to help with mobility, and place rugs or mats on slippery floors to prevent falls.

Encourage gentle, food-based activities such as treat searches or puzzle toys to help your dog stay mentally engaged without overexertion.

Help your dog feel secure by keeping furniture in familiar places, using non-slip mats, and maintaining predictable daily routines.

A mutation in the CLN6 has been identified in Australian Shepherds. Unlike many of the other proteins that cause NCL, CLN6 is not located in the lysosome. Instead, it is found in a cell structure called the endoplasmic reticulum, which is where proteins are made and modified before being shuttled elsewhere for use. CLN6 is thought to to help shuttle proteins specifically into the lysosome.

Penetrance: This disease is inherited in an autosomal recessive manner, meaning that affected dogs must have two copies of the mutation to show clinical signs.

Gene

CLN6 (Exon 7)

Inheritance type

recessive

Clinical category

Multisystem

Citations

1. Katz et al 2011

• Australian Shepherd
• Australian Shepherd
• Miniature/MAS-type Australian Shepherd