Nov 3, 2018

Stem cell differentiation trajectories in Hydra resolved at single-cell resolution

BioRxiv : the Preprint Server for Biology
Stefan SiebertCelina E. Juliano

Abstract

The adult Hydra polyp continuously renews all of its cells using three separate stem cell populations, but the genetic pathways enabling homeostatic tissue maintenance are not well understood. We used Drop-seq to sequence transcriptomes of 24,985 single Hydra cells and identified the molecular signatures of a broad spectrum of cell states, from stem cells to terminally differentiated cells. We constructed differentiation trajectories for each cell lineage and identified the transcription factors expressed along these trajectories, thus creating a comprehensive molecular map of all developmental lineages in the adult animal. We unexpectedly found that neuron and gland cell differentiation transits through a common progenitor state, suggesting a shared evolutionary history for these secretory cell types. Finally, we have built the first gene expression map of the Hydra nervous system. By producing a comprehensive molecular description of the adult Hydra polyp, we have generated a resource for addressing fundamental questions regarding the evolution of developmental processes and nervous system function.

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Mentioned in this Paper

Biochemical Pathway
Secretory Cell
Polyps
Hydra Polyps
Transcription, Genetic
Entire Nervous System
Neurons
Gene Expression
Genetic Activator
Cell Differentiation Process

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