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Cell-Lineage Tracing in Zebrafish Embryos with an Expanded Genetic Code.

Wes Brown1, Jihe Liu1, Michael Tsang2

  • 1Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA.

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|April 28, 2018
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Summary

Researchers developed a light-activated Cre recombinase for precise cell lineage tracing in zebrafish. This photoactivatable tool enables spatiotemporal control over DNA recombination, advancing studies in development and disease.

Keywords:
DNA recombinationlineage tracingoptogeneticsunnatural amino acidszebrafish

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Cell-lineage tracing is crucial for understanding embryonic development, stem cell differentiation, and tumor heterogeneity.
  • Current Cre recombinase methods lack precise spatiotemporal control over DNA recombination, limiting their utility.

Purpose of the Study:

  • To develop a photoactivatable Cre recombinase for precise spatiotemporal control of DNA recombination.
  • To establish a novel tool for advanced cell-lineage tracing in vivo.

Main Methods:

  • Utilized genetic code expansion in zebrafish embryos to introduce a photocaged lysine derivative into the Cre recombinase active site.
  • Engineered a photoactivatable Cre recombinase activated by 405 nm irradiation.
  • Demonstrated cell-lineage tracing by activating the tool in specific regions and at different times during early embryogenesis.

Main Results:

  • Achieved high spatiotemporal control over DNA recombination using light.
  • Confirmed no background Cre recombinase activity before irradiation.
  • Restored Cre recombinase activity upon light-induced removal of the caging group.
  • Successfully employed the tool for cell-lineage tracing in different embryonic regions and time points.

Conclusions:

  • Photoactivatable Cre recombinase offers precise light-mediated control over DNA recombination.
  • This technology enhances the precision of cell-lineage tracing in metazoan development and disease studies.
  • Enables more nuanced investigations into complex biological processes.