Persian Cat Polycystic Kidney Disease (PKD): Genetic Testing & Management

Genetics of Feline PKDFeline AD-PKD is caused by a single-point mutation (C→A transversion) in exon 29 of the PKD1 gene on chromosome E3. Only one copy of the mutated gene is required to cause disease (autosomal dominant with 100% penetrance). Affected cats develop renal...

Genetics of Feline PKD

Feline AD-PKD is caused by a single-point mutation (C→A transversion) in exon 29 of the PKD1 gene on chromosome E3. Only one copy of the mutated gene is required to cause disease (autosomal dominant with 100% penetrance). Affected cats develop renal cysts bilaterally from birth, though clinical signs typically appear between 3-10 years of age depending on cyst burden. Prevalence: approximately 38% of Persian cats worldwide, with similar rates in Exotic Shorthairs and Himalayans (breeds derived from Persian foundation stock).

Clinical Staging

• Stage 1 (pre-clinical): Normal bloodwork, cysts visible on ultrasound, no clinical signs
• Stage 2 (early renal insufficiency): Mild azotemia, polyuria/polydipsia begins, urine concentrating ability declines
• Stage 3 (overt renal failure): BUN >60 mg/dL, creatinine >3.0 mg/dL, weight loss, anemia, hypertension
• Stage 4 (end-stage): Severe azotemia, uremic gastroenteritis, oral ulceration, seizures from uremic encephalopathy

Screening and Prevention

Genetic testing (cheek swab or blood sample sent to UC Davis VGL or Langford VDS) identifies the PKD1 mutation with >99% accuracy. All Persian breeding cats should be tested — affected cats must be removed from breeding programs. Renal ultrasound at 10 months of age visualizes cysts ≥2mm. Breeding an affected cat with a normal cat produces approximately 50% affected offspring — this is how the prevalence remains high in catteries that do not screen.

References & Further Reading

• ASPCA. Common Dog & Cat Behavior Issues. aspca.org/pet-care
• American Animal Hospital Association (AAHA). Pet Behavior Resources. aaha.org
• Journal of Veterinary Behavior (Elsevier). Clinical Applications and Research. sciencedirect.com
• American Veterinary Society of Animal Behavior (AVSAB). Position Statements & Resources. avsab.org

Citations are provided for educational reference. Content is reviewed periodically but does not replace professional veterinary advice. If your pet shows signs of illness, contact a licensed veterinarian immediately.