OTULIN maintains skin homeostasis by controlling keratinocyte death and stem cell identity

Esther Hoste, Kim Lecomte, Karl Annusver, Niels Vandamme, Jana Roels, Sophia Maschalidi, Lien Verboom, Hanna Kaisa Vikkula, Mozes Sze, Lisette Van Hove, Kevin Verstaen, Arne Martens, Tino Hochepied, Yvan Saeys, Kodi Ravichandran, Maria Kasper, Geert van Loo

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

OTULIN is a deubiquitinase that specifically cleaves linear ubiquitin chains. Here we demonstrate that the ablation of Otulin selectively in keratinocytes causes inflammatory skin lesions that develop into verrucous carcinomas. Genetic deletion of Tnfr1, knockin expression of kinase-inactive Ripk1 or keratinocyte-specific deletion of Fadd and Mlkl completely rescues mice with OTULIN deficiency from dermatitis and tumorigenesis, thereby identifying keratinocyte cell death as the driving force for inflammation. Single-cell RNA-sequencing comparing non-lesional and lesional skin reveals changes in epidermal stem cell identity in OTULIN-deficient keratinocytes prior to substantial immune cell infiltration. Keratinocytes lacking OTULIN display a type-1 interferon and IL-1β response signature, and genetic or pharmacologic inhibition of these cytokines partially inhibits skin inflammation. Finally, expression of a hypomorphic mutant Otulin allele, previously shown to cause OTULIN-related autoinflammatory syndrome in humans, induces a similar inflammatory phenotype, thus supporting the importance of OTULIN for restraining skin inflammation and maintaining immune homeostasis.

Original languageEnglish
Article number5913
JournalNature communications
Volume12
Issue number1
DOIs
StatePublished - Dec 2021

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