A 4-month-old female Irish Terrier presented with a well demarcated ulcerative and crusting lesion in the right ear canal. Histological analysis revealed epidermal hyperplasia with severe acantholysis affecting all suprabasal layers of the epidermis, which prompted a presumptive diagnosis of canine Darier disease. The lesion was successfully treated by repeated laser ablation of the affected epidermis. Over the course of three years, the dog additionally developed three dermal nodules of up to 4 cm in diameter that were excised and healed without complications. Histology of the excised tissue revealed multiple infundibular cysts extending from the upper dermis to the subcutis. The cysts were lined by squamous epithelium, which presented with abundant acantholysis of suprabasal keratinocytes. Infundibular cysts represent a novel finding not previously reported in Darier patients. Whole genome sequencing of the affected dog was performed, and the functional candidate genes for Darier disease () and Hailey-Hailey disease () were investigated. The analysis revealed a heterozygous SINE insertion into the gene, at the end of intron 14, close to the boundary of exon 15. Analysis of the mRNA from skin of the affected dog demonstrated a splicing defect and marked allelic imbalance, suggesting nonsense-mediated decay of the resulting aberrant transcripts. As Darier disease in humans is caused by haploinsufficiency of , our genetic findings are in agreement with the clinical and histopathological data and support the diagnosis of canine Darier disease.
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http://dx.doi.org/10.3390/genes11050481 | DOI Listing |
Clin Cosmet Investig Dermatol
January 2025
Division of Dermatology, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Papular acantholytic dyskeratosis (PAD) of the vulva is an uncommon benign condition characterized by multiple hyperkeratotic papules in the anogenital region. First described in 1984, PAD belongs to the spectrum of focal acantholytic dyskeratoses and shares histopathological features with Darier disease and Hailey-Hailey disease. Despite its persistence, PAD is benign, requiring only reassurance in many cases.
View Article and Find Full Text PDFJAAD Int
February 2025
Department of Dermatology, Mayo Clinic, Rochester, Minnesota.
Australas J Dermatol
December 2024
Skin Health Institute, Melbourne, Victoria, Australia.
Qual Life Res
December 2024
Department of Health Policy, Corvinus University of Budapest, 8 Fővám Square, Budapest, Hungary, 1093.
Objectives: Limited evidence is available about the content validity of the EQ-5D-5L in rare skin fragility disorders. Previous research has demonstrated that the skin irritation and self-confidence additional dimensions (bolt-ons) improve the content validity of the EQ-5D-5L in psoriasis and atopic dermatitis. Our aim was to investigate the content validity of the EQ-5D-5L and the two bolt-ons in Darier's disease and Hailey-Hailey disease.
View Article and Find Full Text PDFOrphanet J Rare Dis
December 2024
Department of Dermatology and Venereology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gröna stråket 16, Gothenburg, SE-413 45, Sweden.
Background: Darier disease is a genodermatosis which manifests as hyperkeratotic papules and superficial erosions mainly in seborrheic skin areas. This retrospective registry-based cohort study aimed to estimate the association between Darier disease and skin cancer.
Results: Patients diagnosed with Darier disease were identified from the patient registry of Sahlgrenska University Hospital (Gothenburg, Sweden) in 2016-2020.
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