Ichthyosis (Golden Retriever Type 2)

Other Names: Nonepidermolytic ichthyosis, ICH2, NI
Affected Genes: ABHD5
Inheritance: Autosomal Recessive With Variable Expressivity
Mutation: chr23:2274932-2274945 (canFam4): 14 bp deletion (GACTTCAACCAGAA)
Breed(s): Golden Retriever, Goldendoodle

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Common Symptoms

Ichthyosis (Golden Retriever Type 2) is an inherited condition of the skin affecting dogs. The age of onset and severity of disease are highly variable, however most affected dogs present before one year of age with flaky skin and dull hair. Over time the skin develops a grayish color and appears thick and scaly, especially over the abdomen. The symptoms may progress to severe scaling all over the body, may improve with age, or may come and go over the dog’s lifetime. While the prognosis is generally good for affected dogs, they are at increased risk for skin infections.

Testing Tips

Genetic testing of the ABHD5 gene in dogs will reliably determine whether a dog is a genetic Carrier of ichthyosis (Golden Retriever Type 2). Ichthyosis 2 is inherited in an Autosomal Recessive manner in dogs meaning that they must receive two copies of the mutated gene (one from each parent) to develop the disease. In general, carrier dogs do not have features of the disease but when bred with another carrier of the same Mutation, there is a risk of having affected pups. Each pup that is born to this pairing has a 25% chance of inheriting the disease and a 50% chance of inheriting one copy and being a carrier of the ABHD5 gene mutation. Reliable genetic testing is important for determining breeding practices. Because some affected dogs exhibit very mild symptoms, genetic testing should be performed before breeding. In order to eliminate this mutation from breeding lines and to avoid the potential of producing affected pups, breeding of known carriers to each other is not recommended. Dogs that are not carriers of the mutation have no increased risk of having affected pups.

There may be other causes of this condition in dogs and a normal result does not exclude a different mutation in this gene or any other gene that may result in a similar genetic disease or trait.

References

  • Grall A, Guaguère E, Planchais S, Grond S, Bourrat E, Hausser I, Hitte C, Le Gallo, M., Derbois C, Kim GJ, Lagoutte L, Degorce-Rubiales F, Radner FP, Thomas A, Küry S, Bensignor E, Fontaine J, Pin D, Zimmermann R, Zechner R, Lathrop M, Galibert F, André C, Fischer J. PNPLA1 mutations cause autosomal recessive congenital ichthyosis in golden retriever dogs and humans. Nat Genet. 2012 Jan 15;44(2):140-7. [PubMed: 22246504]
  • Guaguere E, Bensignor E, Küry S, Degorce-Rubiales F, Muller A, Herbin L, Fontaine J, André C. Clinical, histopathological and genetic data of ichthyosis in the golden retriever: a prospective study. J Small Anim Pract. 2009 May;50(5):227-35. [PubMed: 19413748]
  • Guaguere E, Thomas A, Grall, A, Bourrat E, Lagoutte L, Degorce-Rubiales F, Hitte C, Bensignor E, Fontaine J, Pin D, Queney G, Andre C. Autosomal recessive ichthyosis in golden retriever dogs: distribution and frequency of the PNPLA1 mutant allele in different populations. In Torres SMF, Fran LA, Hargis AM. Ames (eds), Advances in Veterinary Dermatology, 7th ed. John Wiley & Sons Ltd, 2013.
  • Kiener S, Wiener D, Hopke K, Diesel A, Jagannathan V, Mauldin E, Casal M, Leeb T.  ABHD5 frameshift deletion in Golden Retrievers with ichthyosis, G3 Genes|Genomes|Genetics, 2021 [PubMed: 34791225]