Centre for Gene Therapy and Regenerative Medicine, King's College London, London, UK.
Department of Physics, Randall Centre for Cell and Molecular Biophysics, Centre for the Physical Science of Life and London Centre for Nanotechnology, King's College London, London, UK.
Nat Cell Biol. 2023 Oct;25(10):1426-1438. doi: 10.1038/s41556-023-01234-5. Epub 2023 Sep 21.
Dedifferentiation is the process by which terminally differentiated cells acquire the properties of stem cells. During mouse skin wound healing, the differentiated Gata6-lineage positive cells of the sebaceous duct are able to dedifferentiate. Here we have integrated lineage tracing and single-cell mRNA sequencing to uncover the underlying mechanism. Gata6-lineage positive and negative epidermal stem cells in wounds are transcriptionally indistinguishable. Furthermore, in contrast to reprogramming of induced pluripotent stem cells, the same genes are expressed in the epidermal dedifferentiation and differentiation trajectories, indicating that dedifferentiation does not involve adoption of a new cell state. We demonstrate that dedifferentiation is not only induced by wounding, but also by retinoic acid treatment or mechanical expansion of the epidermis. In all three cases, dedifferentiation is dependent on the master transcription factor c-Myc. Mechanotransduction and actin-cytoskeleton remodelling are key features of dedifferentiation. Our study elucidates the molecular basis of epidermal dedifferentiation, which may be generally applicable to adult tissues.
去分化是终末分化细胞获得干细胞特性的过程。在小鼠皮肤伤口愈合过程中,皮脂腺导管中分化的 Gata6 谱系阳性细胞能够去分化。在这里,我们整合了谱系追踪和单细胞 mRNA 测序,以揭示潜在的机制。伤口中 Gata6 谱系阳性和阴性的表皮干细胞在转录上无法区分。此外,与诱导多能干细胞的重编程相反,在表皮去分化和分化轨迹中表达相同的基因,表明去分化不涉及采用新的细胞状态。我们证明,去分化不仅由创伤诱导,还可由维甲酸处理或表皮机械扩张诱导。在所有三种情况下,去分化都依赖于主转录因子 c-Myc。机械转导和肌动蛋白细胞骨架重塑是去分化的关键特征。我们的研究阐明了表皮去分化的分子基础,这可能普遍适用于成人组织。