Cystinuria is an inherited disorder caused by a defect in the transport of cystine, an amino acid, in the kidney tubules. This defect has been linked to a gene called SLC3A1 in the Newfoundland breed. Normally, cystine that is filtered in the kidney is reabsorbed within the tubules, resulting in little cystine in the urine. Dogs with Cystinuria do not properly reabsorb cystine (and a few other amino acids) in the kidney tubules, causing the urine to contain abnormally high levels of cystine. Cystine is insoluble in neutral pH or acidic urine, so excess urinary cystine results in formation of cystine crystals, which in turn can lead to formation of cystine calculi (stones) in the kidney and/or bladder. Because males have long, narrow urethras compared to females, irritation and blockage by calculi is much more common in the male. Males with Cystinuria suffer repeated inflammations of the urinary tract and are at risk for urinary blockage, which can, if not treated promptly, lead to kidney failure, bladder rupture, and death. Cystinuria has been reported in many breeds (and mixed breeds) of dogs.
Test specific information
The genetic factor is continuously present, and will always be visible.
Normally the result can be expected within 10 working days. This turn-around-time starts when both the sample and the fully filled-out and signed submission form have been received.
Location of disease or trait
This disease is present in the entire body, but causes main effects in the internal organs such as stomach, intestinal tract, liver and / or kidneys. In a number of cases, the disease affects one major internal organ.
This DNA test is available for the following breeds: Landseer, New Foundlander. Additional information is available in the Frequently Asked Questions (FAQ).
For this DNA test we accept the following materials: Semen, Blood EDTA, Blood Heparin, Tissue, Swab. Please contact Dr. Van Haeringen Laboratorium if you wish to submit other material as listed.
An animal can be free and has in that situation two healthy alleles. When used in breeding this animal will not become ill due to the disease. It cannot spread the disease in the population.
An animal can be carrier and has in that situation one healthy and one disease allele. When used in breeding 50 percent of the offspring will receive the disease allele. Carriers will not become ill.
An animal can be affected and has in that situation two disease alleles. When used in breeding all offspring will also receive the disease allele. Affected will become ill.
This genetic factor is inherited in an autosomal, recessive, mode. This means, that the individual can be free of the disease (homozygote normal), affected (homozygous affected) or carrier (heterozygous).
Carriers may spread the mutation in a population without showing symptoms themselves. Because of this, it is extremely important to identify carriers correctly to prevent spreading of a mutation.
Severity of Disease