A Missense Variant Affecting the C-Terminal Tail of UNC93B1 in Dogs with Exfoliative Cutaneous Lupus Erythematosus (ECLE).

Leeb, Tosso; Leuthard, Fabienne; Jagannathan, Vidya; Kiener, Sarah; Letko, Anna; Roosje, Petra; Welle, Monika M.; Gailbreath, Katherine L; Cannon, Andrea; Linek, Monika; Banovic, Frane; Olivry, Thierry; White, Stephen D; Batcher, Kevin; Bannasch, Danika; Minor, Katie M; Mickelson, James R; Hytönen, Marjo K; Lohi, Hannes; Mauldin, Elizabeth A; ... (2020). A Missense Variant Affecting the C-Terminal Tail of UNC93B1 in Dogs with Exfoliative Cutaneous Lupus Erythematosus (ECLE). Genes, 11(2) MDPI, Molecular Diversity Preservation International 10.3390/genes11020159

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Cutaneous lupus erythematosus (CLE) in humans encompasses multiple subtypes that exhibit a wide array of skin lesions and, in some cases, are associated with the development of systemic lupus erythematosus (SLE). We investigated dogs with exfoliative cutaneous lupus erythematosus (ECLE), a dog-specific form of chronic CLE that is inherited as a monogenic autosomal recessive trait. A genome-wide association study (GWAS) with 14 cases and 29 controls confirmed a previously published result that the causative variant maps to chromosome 18. Autozygosity mapping refined the ECLE locus to a 493 kb critical interval. Filtering of whole genome sequence data from two cases against 654 controls revealed a single private protein-changing variant in this critical interval, UNC93B1:c.1438C>A or p.Pro480Thr. The homozygous mutant genotype was exclusively observed in 23 ECLE affected German Shorthaired Pointers and an ECLE affected Vizsla, but absent from 845 controls. UNC93B1 is a transmembrane protein located in the endoplasmic reticulum and endolysosomes, which is required for correct trafficking of several Toll-like receptors (TLRs). The p.Pro480Thr variant is predicted to affect the C-terminal tail of the UNC93B1 that has recently been shown to restrict TLR7 mediated autoimmunity via an interaction with syndecan binding protein (SDCBP). The functional knowledge on UNC93B1 strongly suggests that p.Pro480Thr is causing ECLE in dogs. These dogs therefore represent an interesting spontaneous model for human lupus erythematosus. Our results warrant further investigations of whether genetic variants affecting the C-terminus of UNC93B1 might be involved in specific subsets of CLE or SLE cases in humans and other species.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > DermFocus
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Animal Pathology
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Dermatology
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Leeb, Tosso; Leuthard, Fabienne Nadja; Jagannathan, Vidya; Kiener, Sarah; Letko, Anna; Roosje, Petra and Welle, Monika Maria

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 590 Animals (Zoology)
600 Technology > 610 Medicine & health

ISSN:

2073-4425

Publisher:

MDPI, Molecular Diversity Preservation International

Language:

English

Submitter:

Tosso Leeb

Date Deposited:

14 Feb 2020 09:22

Last Modified:

14 Feb 2020 09:22

Publisher DOI:

10.3390/genes11020159

PubMed ID:

32028618

Uncontrolled Keywords:

CLE Canis familiaris SLE TLR7 animal model dermatology immunology skin syndecan binding protein syntenin-1 systemic lupus erythematosus toll-like receptor

BORIS DOI:

10.7892/boris.140088

URI:

https://boris.unibe.ch/id/eprint/140088

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