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Novel TMC8 splice site mutation in epidermodysplasia verruciformis and review of HPV infections in patients with the disease
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID
3885998
Author(s)
Imahorn, E.; Yüksel, Z.; Spoerri, I.; Gürel, G.; Imhof, C.; Saraçoğlu, Z. N.; Koku Aksu, A. E.; Rady, P. L.; Tyring, S. K.; Kempf, W.; Itin, P. H.; Burger, B.
Novel TMC8 splice site mutation in epidermodysplasia verruciformis and review of HPV infections in patients with the disease
Journal
Journal of the European Academy of Dermatology and Venereology : JEADV
Volume
31
Number
10
Pages / Article-Number
1722-1726
Keywords
Epidermodysplasia verruciformis, human papilloma virus, splice site mutation, TMC6, TMC8, genetic skin disease, genodermatosis
Abstract
Epidermodysplasia verruciformis (EV) is a genodermatosis leading to infections with cutaneous HPV, persistent plane warts and a high rate of non-melanoma skin cancer (NMSC). Biallelic loss-of-function mutations in TMC6 and TMC8 are known to be causative.; The aim of this study was to report EV-causing mutations in four patients with EV and to give an overview of all described patients with EV.; We investigated four patients with classical features of EV from two families. All patients were affected by plane warts with typical EV histology since early childhood, and β-HPVs were detected on their skin. One patient had recurring cutaneous squamous cell carcinomas (cSCC) and carcinomas in situ (Bowen type). We sequenced both TMC6/8 for disease-causing mutations and quantified levels of gene expression. We also performed a systematic literature review to discuss these patients in the context of previously reported cases, mutations already identified, as well as HPV types.; Three patients of one family carried a homozygous splice site mutation in TMC8 resulting in aberrantly spliced transcripts that were not degraded. By contrast, no TMC6/8 mutation was detected in the patient from the other family. A systematic literature review revealed 501 described patients with EV. Around 40% of patients with EV analysed for genetic alterations carried no mutation in TMC6/8. While β-HPVs were identified in the majority of cases, α-HPVs were detected in several individuals.; The relatively high proportion of EV patients without mutation in TMC6/8 indicates the existence of EV-causing mutations in additional, presently unknown gene(s). However, a homozygous TMC8 splice site mutation in our patients resulted in aberrant transcripts which cannot retain the healthy phenotype. The literature review revealed that HPV-5 is the most commonly identified HPV in patients with EV, but HPV-3, HPV-14 and HPV-20 were unexpectedly identified more frequently than HPV-8.
