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Differentiation and Characterization of Neural Progenitors and Neurons from Mouse Embryonic Stem Cells
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Mouse embryonic stem cells can differentiate via multiple paths to the same state.

James Alexander Briggs1, Victor C Li1, Seungkyu Lee2,3

  • 1Department of Systems Biology, Harvard Medical School, Boston, United States.

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|October 10, 2017
PubMed
Summary

Direct programming bypasses typical embryonic cell development, creating a unique transitional state. Despite this, the resulting motor neurons are functionally and transcriptionally similar to those from embryonic development.

Keywords:
developmental biologydifferentiation trajectorydirect programmingembryonic developmentmotor neuronmousesingle cell RNA-seqstem cell differentiationstem cells

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Area of Science:

  • Developmental biology
  • Cell differentiation
  • Neuroscience

Background:

  • Embryonic development involves cells progressing through defined intermediate states to reach mature fates.
  • Direct programming, using transcription factors, offers an alternative route to cell fate generation.
  • The relationship between direct programming routes and embryonic differentiation pathways remains largely unexplored.

Purpose of the Study:

  • To compare the differentiation pathways of a standard embryonic-like protocol with a direct programming method for motor neurons.
  • To investigate the gene expression dynamics and intermediate states generated by each protocol.
  • To determine if direct programming yields motor neurons comparable to those from embryonic development.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) was employed to profile cells during differentiation.
  • Two motor neuron differentiation protocols were analyzed: one mimicking embryonic lineage and one using direct programming.
  • Gene expression patterns and cell state trajectories were compared between the two protocols.

Main Results:

  • Both protocols initiated with similar early neural commitment.
  • The direct programming pathway diverged, forming a novel transitional state with distinct gene expression, unlike embryonic spinal intermediates.
  • This novel state formed a loop in gene expression space, ultimately converging on the same final motor neuron state as the standard protocol.
  • Motor neurons generated by both methods were transcriptionally, structurally, and functionally similar to embryonic motor neurons.

Conclusions:

  • Direct programming generates motor neurons via a distinct pathway involving a unique transitional state.
  • Despite differing developmental histories, direct programming successfully produces mature motor neurons comparable to those derived from embryonic development.
  • This suggests that alternative differentiation routes can yield functionally equivalent cell types.