Junctional epidermolysis bullosa / JEB (LAMB3-related) - Australian Shepherd

What does this test examine?

This genetic test analyses the LAMB3 variant c.1174T>C for LAMB3-related junctional epidermolysis bullosa in the Australian Shepherd. The condition is also known as JEB, junctional epidermolysis bullosa, epidermolysis bullosa, EB, skin fragility syndrome, ectodermal dysplasia and inherited blistering skin disease. The test shows whether the dog is clear, a carrier or has two copies of the tested variant.

What does this condition mean?

JEB is a severe inherited disorder in which the connection between the epidermis and the underlying skin is not strong enough. Minimal friction, pressure or normal movement can therefore cause blisters, erosions, ulcers and detachment of skin or mucosa. Footpads, mouth, lips, tongue, throat, abdomen, groin and other pressure or friction sites can be involved.

For this Australian Shepherd variant, lesions can appear during the first weeks of life. Reported puppies had widespread ulcers on the skin, footpads and oral mucosa, poor growth and a severe clinical course.

Practical value of this test

• reveals hidden carriers before they are used in breeding combinations
• helps avoid carrier-to-carrier matings and prevents puppies with severe skin fragility
• gives breeders concrete information to manage valuable lines responsibly
• supports risk management, selection and clear communication with puppy buyers or breed organisations
• can help recognise an inherited cause more quickly in puppies with blisters, ulcers or fragile skin

Who benefits from this test?

This test is especially valuable for breeders working with Australian Shepherd lines, owners who want to know the genetic status of a breeding dog and veterinarians who want to place severe skin fragility in puppies in a genetic context. A result before mating makes it possible to use carriers responsibly without producing affected puppies.

Inheritance and result

JEB is inherited as autosomal recessive. T/T means that the tested variant was not detected. T/C means that the dog is a carrier. C/C causes the tested form of junctional epidermolysis bullosa.