Hereditary nasal parakeratosis / HNPK (SUV39H2-related) - Greyhound

What does this test assess?

This genetic test analyzes the SUV39H2 variant c.996+3_996+6delAAGT for Hereditary nasal parakeratosis / HNPK in the Greyhound. The condition is also described as hereditary nasal parakeratosis, HNPK, nasal parakeratosis, dry nose, crusty nose and SUV39H2-related keratinization disorder.

What does this condition mean?

HNPK is an inherited skin disorder in which keratinization of the nasal planum is abnormal. Affected Greyhounds can develop hard, scaly crusts, dry thickening, painful fissures and chronic irritation on the nose. The SUV39H2 gene is involved in regulating keratinocyte differentiation; disruption of this process explains why the nose is mainly affected.

Inheritance and result

The trait is inherited as an autosomal recessive condition. Dogs with two copies of the tested variant are expected to be affected. Carriers have one copy, often look healthy and can still pass the variant on.

• Clear: the tested variant was not detected.
• Carrier: one copy of the variant was detected; this is mainly important for breeding plans.
• Affected: two copies of the variant were detected; this genotype causes this condition for this variant.

When is testing useful?

Testing is useful for Greyhounds selected for breeding, dogs from lines with nasal problems and when a dry, crusted nose needs a genetic explanation. Because carriers usually have no visible skin signs, DNA testing helps identify hidden variants in a line in time.

Practical value of this test

The test makes hidden carrier status visible and helps breeders, veterinarians and owners make decisions based on concrete genetic information.

• Helps identify carriers before breeding combinations are made.
• Supports avoiding puppies with painful nasal fissures and chronic irritation.
• Provides clear genetic context for dry or crusted nose problems.
• Makes selection in Greyhound lines more targeted and transparent.