Lineage Commitment of Dermal Fibroblast Progenitors Is Mediated by Chromatin De-repression

The study investigated how Dermal Fibroblast Progenitors (DFPs) differentiate into various fibroblast lineages during skin development. Using single-cell analysis, epigenetic assays, and allografting techniques, the researchers found that DFPs have a repressed chromatin profile due to H3K27me3, which makes them unable to reform skin despite their multipotency. They discovered that during late embryogenesis, specific fibroblast lineages such as dermal papilla and adipocytes undergo chromatin de-repression through the action of the demethylase Kdm6b/Jmjd3. Deleting Kdm6b/Jmjd3 in tissue-specific experiments led to the loss of the adipocyte compartment and impaired dermal papilla functions, as shown by single-cell RNA sequencing, ChIP sequencing, and allograft assays. The study provides a detailed understanding of DFP differentiation and introduces a new multiomic search tool at skinregeneration.org for further research.