Cat Polycystic Kidney Disease Genetic Testing and Welfare

PKD is a hereditary condition causing fluid-filled cysts that progressively replace kidney tissue in Persian and related breeds, with a simple DNA test allowing complete elimination from breeding populations.

Key Facts

PKD1 gene mutation causes autosomal dominant PKD in Persian, Himalayan, and related breeds
Approximately 36% of Persians were affected globally before testing became widespread
PKD1 genetic test from DNA swab identifies carriers and affected cats before breeding
Cats inheriting two copies of the mutation die early - most affected cats are heterozygous
Cysts are detectable by ultrasound from 6 weeks of age
CKD develops progressively as cysts replace kidney tissue, typically manifesting clinically at 3-7 years
PKD breeding registries help document the proportion of tested breeding cats in registered populations

Welfare Considerations

PKD represents one of veterinary medicine clearest genetic disease welfare prevention opportunities. The mutation causes progressive, predictable kidney disease that reduces lifespan and quality of life in a condition entirely preventable through a single DNA test costing approximately 40-70 dollars. Breeding PKD-positive cats to PKD-negative cats produces 50% affected offspring. Breeding two PKD-negative tested cats eliminates the condition entirely in offspring. The existence of PKD testing for over 20 years means that PKD in pedigree Persians today reflects a breeding decision failure rather than an unavoidable health burden.

What You Can Do

Request PKD DNA test results from breeders before purchasing any Persian or related breed kitten
Never breed PKD-positive cats - this is an entirely preventable disease
Support breed clubs that make PKD testing mandatory for all registered breeding cats
Screen all breeding cats with annual kidney ultrasound from 6 weeks of age in PKD-affected breeds
Advocate for PKD-free registry participation as a condition of breed registration in international cat fancy organizations