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Article

LAMB3 Missense Variant in Australian Shepherd Dogs with Junctional Epidermolysis Bullosa

1
Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
2
Dermfocus, University of Bern, 3001 Bern, Switzerland
3
The Ottawa Animal Emergency and Specialty Hospital, Ottawa, ON K1K 4C1, Canada
4
School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
5
Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work (shared first authors).
Genes 2020, 11(9), 1055; https://doi.org/10.3390/genes11091055
Received: 10 August 2020 / Revised: 28 August 2020 / Accepted: 3 September 2020 / Published: 7 September 2020
(This article belongs to the Special Issue Molecular Basis of Inherited Diseases in Companion Animals)
In a highly inbred Australian Shepherd litter, three of the five puppies developed widespread ulcers of the skin, footpads, and oral mucosa within the first weeks of life. Histopathological examinations demonstrated clefting of the epidermis from the underlying dermis within or just below the basement membrane, which led to a tentative diagnosis of junctional epidermolysis bullosa (JEB) with autosomal recessive inheritance. Endoscopy in one affected dog also demonstrated separation between the epithelium and underlying tissue in the gastrointestinal tract. As a result of the severity of the clinical signs, all three dogs had to be euthanized. We sequenced the genome of one affected puppy and compared the data to 73 control genomes. A search for private variants in 37 known candidate genes for skin fragility phenotypes revealed a single protein-changing variant, LAMB3:c.1174T>C, or p.Cys392Arg. The variant was predicted to change a conserved cysteine in the laminin β3 subunit of the heterotrimeric laminin-322, which mediates the binding of the epidermal basement membrane to the underlying dermis. Loss-of-function variants in the human LAMB3 gene lead to recessive forms of JEB. We confirmed the expected co-segregation of the genotypes in the Australian Shepherd family. The mutant allele was homozygous in two genotyped cases and heterozygous in three non-affected close relatives. It was not found in 242 other controls from the Australian Shepherd breed, nor in more than 600 other controls. These data suggest that LAMB3:c.1174T>C represents the causative variant. To the best of our knowledge, this study represents the first report of a LAMB3-related JEB in domestic animals. View Full-Text
Keywords: dog; Canis lupus familiaris; whole genome sequence; wgs; dermatology; genodermatosis; skin; laminin; precision medicine dog; Canis lupus familiaris; whole genome sequence; wgs; dermatology; genodermatosis; skin; laminin; precision medicine
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MDPI and ACS Style

Kiener, S.; Laprais, A.; Mauldin, E.A.; Jagannathan, V.; Olivry, T.; Leeb, T. LAMB3 Missense Variant in Australian Shepherd Dogs with Junctional Epidermolysis Bullosa. Genes 2020, 11, 1055. https://doi.org/10.3390/genes11091055

AMA Style

Kiener S, Laprais A, Mauldin EA, Jagannathan V, Olivry T, Leeb T. LAMB3 Missense Variant in Australian Shepherd Dogs with Junctional Epidermolysis Bullosa. Genes. 2020; 11(9):1055. https://doi.org/10.3390/genes11091055

Chicago/Turabian Style

Kiener, Sarah, Aurore Laprais, Elizabeth A. Mauldin, Vidhya Jagannathan, Thierry Olivry, and Tosso Leeb. 2020. "LAMB3 Missense Variant in Australian Shepherd Dogs with Junctional Epidermolysis Bullosa" Genes 11, no. 9: 1055. https://doi.org/10.3390/genes11091055

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