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In the mesothelium, for example, there have been reports of putative stem/progenitor cells for over two decades, but a well-defined stem cell population has yet to be identified 3. It is also unclear if stem cells are necessarily required to maintain epithelial tissues comprising a single cell type, as some baseline capacity for proliferation could maintain the entire tissue. For example, it has been shown that following stem cell depletion, differentiated airway epithelial cells can dedifferentiate and become functional multipotent stem cells 2. While several distinct stem cell populations have been functionally described, such as an LGR5 + population at the base of intestinal crypts 1, it is unclear if all epithelial tissues are maintained by such defined populations. The characterization of stem cells associated with epithelial tissue maintenance has been an active field of research for the past few decades. It is thought that stem cell populations are responsible for long-term maintenance of many adult tissues. These findings support that the OSE may not require distinct stem cells for long-term maintenance, and may instead achieve this through transient dedifferentiation into a stem-like state. Expression profiles of these populations are extremely context specific, suggesting that stemness may not be associated with a single, distinct population, but rather is a heterogeneous cell state that may emerge from diverse environmental cues. We find that stemness is often linked to mesenchymal-associated gene expression and higher activation of ERK signalling, but is not consistently dependent on their activation. We show that traits associated with stem cells can be increased following exposure to the cytokine TGFB1, overexpression of the transcription factor Snai1, or deletion of Brca1. The contribution of tissue-resident stem cells in the homeostasis of several epithelial tissues is widely accepted, but their involvement in OSE is unclear. This wound is quickly repaired, but mechanisms promoting repair are poorly understood. The ovarian surface epithelium (OSE) is a monolayer of epithelial cells surrounding the ovary that ruptures during each ovulation to allow release of the oocyte.

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