Neuronal Ceroid Lipofuscinosis, Cerebellar Ataxia, NCL4A

ARSG Exon 2, American Staffordshire Terrier Variant

Multisystem

This condition affects how cells recycle waste. When waste accumulates, nerve cells are damaged, resulting in neurological signs that typically begin in adult dogs and worsen over time.

Signs and symptoms

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

American Staffordshire Terriers with this mutation are reported to show neurologic symptoms between three and five years of age.

Diagnosis

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.

Treatment

What to do if your dog is at risk

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.

Genetic information

A mutation in the ARSG gene was first identified in American Staffordshire Terriers with a late onset form of NCL. ARSG codes for the enzyme arylsulfatase G, which breaks down specific protein linkages during lysosomal protein recycling. The mutated enzyme has significantly lower enzyme activity, leading to symptoms of NCL.

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: ARSG (Exon 2)
Inheritance type: recessive
Clinical category: Multisystem