Under normal conditions, purines are broken down in the body into uric acid, which is then further converted into more soluble compounds that are easily excreted. In dogs affected by HUU, a mutation—most commonly in the SLC2A9 gene—impairs this conversion process. As a result, uric acid levels in the urine become abnormally high, increasing the risk of crystal and stone formation within the urinary tract.
Clinical signs of HUU often develop when urinary stones begin to form. Some dogs may remain asymptomatic for long periods, while others show signs earlier in life. Common symptoms include frequent urination, straining to urinate, blood in the urine (hematuria), urinary accidents in the house, or discomfort while urinating. In more severe cases, urinary stones may cause partial or complete urinary obstruction, which is a medical emergency.
Dogs affected by HUU are also at increased risk of recurrent urinary tract infections and chronic bladder irritation due to the presence of crystals or stones. Without management, repeated stone formation can lead to kidney complications or serious urinary blockages.
The HUU DNA Health Test is designed to detect the specific mutation in the SLC2A9 gene responsible for Hyperuricosuria. The test is simple, safe, and non-invasive, typically performed using a cheek swab or blood sample. The collected DNA is analyzed in a specialized laboratory to determine whether the dog carries zero, one, or two copies of the mutation. Because DNA remains constant throughout life, testing can be performed at any age, including before clinical signs develop.
Results are generally reported as:
- Clear (Normal): The dog does not carry the HUU mutation and is not expected to develop or pass on the condition.
- Carrier: The dog carries one copy of the mutation but typically does not show clinical signs. However, it can pass the mutation to offspring.
- Affected/At Risk: The dog carries two copies of the mutation and is at high risk of developing urate stones and related urinary complications.
Genetic testing for HUU is highly valuable for breeders, veterinarians, and dog owners. Breeders can use results to avoid carrier-to-carrier matings, significantly reducing the incidence of this urinary disorder in future generations while maintaining genetic diversity.
For dog owners, knowing a dog’s genetic status allows for proactive management of urinary health. Dogs identified as at risk may benefit from dietary modifications, such as low-purine diets, increased water intake, and regular veterinary monitoring. In some cases, medications may be used to help reduce uric acid levels and prevent stone formation.
The Hyperuricosuria (HUU) Health Test is a reliable genetic screening tool that supports responsible breeding practices, promotes canine urinary health, and helps reduce the impact of this inherited metabolic disorder in future generations.
