Deconstructing Olfactory Stem Cell Trajectories at Single-Cell Resolution

Cell Stem Cell. 2017 Jun 1;20(6):817-830.e8. doi: 10.1016/j.stem.2017.04.003. Epub 2017 May 11.


A detailed understanding of the paths that stem cells traverse to generate mature progeny is vital for elucidating the mechanisms governing cell fate decisions and tissue homeostasis. Adult stem cells maintain and regenerate multiple mature cell lineages in the olfactory epithelium. Here we integrate single-cell RNA sequencing and robust statistical analyses with in vivo lineage tracing to define a detailed map of the postnatal olfactory epithelium, revealing cell fate potentials and branchpoints in olfactory stem cell lineage trajectories. Olfactory stem cells produce support cells via direct fate conversion in the absence of cell division, and their multipotency at the population level reflects collective unipotent cell fate decisions by single stem cells. We further demonstrate that Wnt signaling regulates stem cell fate by promoting neuronal fate choices. This integrated approach reveals the mechanisms guiding olfactory lineage trajectories and provides a model for deconstructing similar hierarchies in other stem cell niches.

Keywords: HBC; Wnt; branching lineage; horizontal basal cell; lineage trajectory; olfactory epithelium; scRNA-seq; stem cells.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Adult Stem Cells* / cytology
  • Adult Stem Cells* / metabolism
  • Animals
  • Cell Division / physiology*
  • Mice
  • Mice, Transgenic
  • Multipotent Stem Cells* / cytology
  • Multipotent Stem Cells* / metabolism
  • Olfactory Mucosa* / cytology
  • Olfactory Mucosa* / metabolism
  • Wnt Signaling Pathway / physiology*