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A Method for Lineage Tracing of Corneal Cells Using Multi-color Fluorescent Reporter Mice
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High resolution cell lineage tracing reveals developmental variability in leech.

Stephanie E Gline1, Dian-Han Kuo, Alberto Stolfi

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, California 94720-3200, USA. sgline@berkeley.edu

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|November 20, 2009
PubMed
Summary

Researchers developed a new cell lineage tracing method for leech embryonic development. This technique uses a histone H2B:GFP fusion protein for precise, long-lasting tracking of cell development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Understanding embryonic development requires knowledge of cell proliferation, migration, and differentiation patterns.
  • Technical limitations such as large cell numbers, long development times, and embryo opacity hinder precise cell lineage determination in most species.
  • Inherent variability in cell lineages further complicates accurate tracing.

Purpose of the Study:

  • To present an improved method for cell lineage tracing in the leech Helobdella.
  • To overcome technical challenges in observing precise embryonic cell development.
  • To enable detailed elucidation of cell lineages contributing to specific tissues.

Main Methods:

  • Developed a novel cell lineage tracing technique using microinjection of a plasmid vector.
  • Engineered a construct to drive the expression of a nuclearly localized histone H2B:GFP (green fluorescent protein) fusion protein in selected leech cell lineages.
  • Utilized single-cell resolution to generate a long-lasting and minimally mosaic signal.

Main Results:

  • The histone H2B:GFP fusion protein construct provides a stable and high-resolution signal for lineage tracing.
  • The method does not disrupt the development of most tested lineages.
  • Successfully elucidated previously unobservable details of cell lineages contributing to segmental and prostomial tissues in Helobdella.
  • Demonstrated superior resolution compared to standard dextran lineage tracers.

Conclusions:

  • The improved histone H2B:GFP method offers a powerful tool for precise cell lineage tracing in Helobdella embryos.
  • This technique enhances the understanding of embryonic development by overcoming limitations of traditional methods.
  • The findings facilitate detailed studies of tissue development and cellular contributions in complex embryos.