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Yorkie is required to restrict the injury responses in planarians

Alexander Y.T. Lin, View ORCID ProfileBret J. Pearson
doi: https://doi.org/10.1101/092353
Alexander Y.T. Lin
1Hospital for Sick Children, Program in Developmental and Stem Cell Biology; Toronto, ON, M5G10A4, CANADA
2Department of Molecular Genetics, University of Toronto; Toronto, ON, M5G10A4, CANADA
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Bret J. Pearson
1Hospital for Sick Children, Program in Developmental and Stem Cell Biology; Toronto, ON, M5G10A4, CANADA
2Department of Molecular Genetics, University of Toronto; Toronto, ON, M5G10A4, CANADA
3Ontario Institute for Cancer Research; Toronto, ON, M5G10A4, CANADA
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  • ORCID record for Bret J. Pearson
  • For correspondence: bret.pearson@sickkids.ca
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Abstract

Regeneration requires the precise integration of cues that initiate proliferation, direct differentiation, and ultimately re-pattern tissues to the proper size and scale. Yet how these processes are integrated with wounding cues remains relatively unknown. The freshwater planarian, Schmidtea mediterranea, is an ideal model to study the stereotyped proliferative and transcriptional responses to injury due to its high capacity for regeneration. Here, we characterize the effector of the Hippo signalling cascade, yorkie, during planarian regeneration and its role in restricting early injury responses. In yki(RNAi) regenerating animals, wound responses are hyper-activated; the bimodal proliferation kinetics are heighted and prolonged, while the transcriptional injury responses are similarly augmented with dysregulated temporal patterns. We also uncovered novel wound-induced genes by RNAseq that are primarily associated with tissue patterning. Indeed, a high proportion of non-wound- and wound-induced patterning molecules are mis-expressed in yki(RNAi), which we demonstrate is in part due to an expanded muscle cell population. These altered injury responses have consequential effects on regenerative outcomes, specifically sensing the size of a given injury and appropriately scaling organ and tissue sizes. Taken together, our results suggest that yki functions as a key node to integrate the injury responses of proliferation, apoptosis, injury-induced transcription, and patterning to coordinate regeneration.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted January 02, 2017.
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Yorkie is required to restrict the injury responses in planarians
Alexander Y.T. Lin, Bret J. Pearson
bioRxiv 092353; doi: https://doi.org/10.1101/092353
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Yorkie is required to restrict the injury responses in planarians
Alexander Y.T. Lin, Bret J. Pearson
bioRxiv 092353; doi: https://doi.org/10.1101/092353

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