American Bulldogs and Tibetan Terriers ONLY

The neuronal ceroid-lipofuscinoses (NCLs) are a class of inherited neurological disorders that have been diagnosed in dogs, humans, cats, sheep, goats, cynomolgus monkeys, cattle, horses, and lovebirds. tibetanterr (1)Among dogs, NCL has been reported in many breeds, including English Setters, Tibetan Terriers, American Bulldogs, Dachshunds, Polish Lowland Sheepdogs, Border Collies, Dalmatians, Miniature Schnauzers, Australian Shepherds, Australian Cattle Dogs, Golden Retrievers, and other breeds. NCL is almost always inherited as an autosomal recessive trait.

All of the NCLs have two things in common: pathological degenerative changes occur in the central nervous system, and nerve cells accumulate material that is fluorescent when examined under blue or ultraviolet light. Although neurological signs are always present in canine NCL, these signs vary substantially between breeds and can overlap with signs present in other neurological disorders. Until the gene defect responsible for NCL has been identified for a particular breed, a definitive diagnosis can only be made upon microscopic examination of nervous tissues at necropsy. At this time, we offer the DNA test for Lipofuscinoses in the American Bulldog (LAM) and the Tibetan Terrier (LTT).

Researchers at the University of Missouri-Columbia College of Veterinary Medicine are working to identify the mutation responsible for NCL in each breed where NCL occurs so that the disease can be diagnosed and carriers can be identified on the basis of a DNA-based test. The first step in identifying potentially affected dogs is for the owner or veterinarian to recognize signs that may be indicative of NCL and bring these dogs to our attention.

Please contact the University of Missouri-Columbia College of Veterinary Medicine if you suspect you may have an affected dog.

Symptoms

American Bulldogs — Abnormalities often observed by the owner:

Mental changes: Physical symptoms may appear to worsen during times of stress. Affected dogs do not indicate they are in any pain as coordination decreases.

Changes in gait and posture: Initially, uncoordinated movement in the rear is noted. As the disease progresses, affected dogs develop a wide-based stance starting in rear, and eventually involving all four legs. Affected dogs may exhibit muscle twitching, especially when sleeping. The dogs remain well-muscled through the course of the disease.

Tibetan Terriers — Abnormalities often observed by the owner:

Mental changes: A common sign of NCL in Tibetan Terriers is the development of aggressiveness toward people and/or other dogs. Dogs with this disorder often appear nervous or anxious. Changes in eating habits have also been reported. Affected dogs often lose the effects of both behavioral and house training.

Changes in gait and posture: Early in the course of the disease affected dogs exhibit a mildly uncoordinated gait with occasional stumbling and crossing over. The lack of coordination becomes more severe as the disease progresses. Dogs with NCL often have difficulty jumping up onto surfaces from the ground or floor, and in going up or down stairs. In the end stage of the disease, affected dogs fall over often and have difficulty getting back on their feet.

Visual abnormalities: Impaired vision under dim light conditions, sometimes progressing to visual impairment under bright conditions late in the disease. Pupils may be slightly dilated.

Seizures/convulsions: Mild seizures that are often unrecognized by the owner are common as the disease progresses. Severe seizures do sometimes occur as well.
Information supplied by the University of Missouri-Columbia College of Veterinary Medicine, used by permission.

Order DNA Test

Tests are ordered online through the secure area of the OFA website. Payment is accepted by credit card (MasterCard and VISA). The OFA administers all order handling. Upon receipt of an order, the OFA will send out the test kit which will include a Foam-Tipped Applicator card for DNA sample collection, along with sample collection instructions. Using the FTA card technology, owners can safely collect DNA samples at home. The collection process is non-invasive, and no veterinary appointment is necessary.

Samples are then sent to the University of Missouri College of Veterinary Medicine where the samples will be processed by the Small Animal Molecular Genetics Lab. Results will be forwarded to the OFA, and the OFA will issue the resulting report to the owner.

The fee for each test includes the test kit, laboratory processing, and subsequent registration in the OFA databases.