Niche signals and competitiveness

We have identified 3 major conserved signalling pathways that control the competitive ability of cyst stem cells (CySCs) in the testis, these are Hedgehog (Hh), Hippo (Hpo) and Ras/MAPK. Importantly, Ras/MAPK acts in a very similar manner in Drosophila CySCs and in mouse intestinal stem cells, suggesting our work will help understand fundamental stem cell behaviours. Ras gain of function leads to intestinal tumours, and the first step involves the mutant stem cell out-competing neighbouring wild type cells.
We use live imaging to follow stem cell replacement dynamics and study how these signals affect stem cell behaviour. We are also using large-scale sequencing approaches to find transcriptional targets of each signal, and find genes that could identify competitive stem cells.

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©2016 Amoyel lab

Ras/MAPK activity in stem cells

Ras/MAPK signalling also controls competitive behaviour. Its activity is seen in green, while somatic cells are labelled in magenta.