Neuronal Ceroid Lipofuscinosis 6 / NCL6 (CLN6-related) - Australian Shepherd / Miniature American Shepherd

What does this test examine?

This genetic test analyses the CLN6 c.829T>C variant in the Australian Shepherd and Miniature American Shepherd. The condition is known as neuronal ceroid lipofuscinosis 6, NCL6, CLN6-related lysosomal storage disease and a Batten-like neurodegenerative disorder in dogs.

CLN6 encodes a membrane protein involved in lysosomal and cellular processing. The c.829T>C variant alters the protein and leads to accumulation of storage material in nervous tissue and retina.

What does this condition mean?

NCL6 is a progressive neurodegenerative disorder in which the nervous system and vision progressively deteriorate. It is serious because puppies and young dogs may initially appear normal while the recessive risk remains present in a line.

Affected dogs can develop reduced vision that progresses to blindness, together with anxiety, circling, loss of coordination, cognitive decline and progressive neurological problems.

Inheritance and result

The trait is inherited as autosomal recessive. Two copies of the variant cause the condition. Carriers have one copy, usually appear healthy, and can pass the variant on.

What does the result mean?

• Clear (T/T): the tested variant was not detected.
• Carrier (T/C): the dog carries one copy and can pass the variant on.
• Affected (C/C): two copies cause CLN6-related NCL6.

Practical value of this test

• Shows whether an Australian Shepherd or Miniature American Shepherd is clear, carrier or genetically affected for the tested CLN6 variant.
• Helps breeders avoid carrier-to-carrier matings and prevent puppies with a severe progressive neurological disorder.
• Provides valuable information before young or clinically normal dogs are used for breeding.
• Supports line management when ataxia, behaviour changes, vision loss or NCL occur in related animals.
• Makes communication with puppy buyers and fellow breeders more concrete because variant status is objectively known.

This test is especially valuable in breeds and lines with Australian Shepherd background, because carriers can be clinically normal while still transmitting the recessive risk.