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Related Experiment Video

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Determination of S-Phase Duration Using 5-Ethynyl-2'-deoxyuridine Incorporation in Saccharomyces cerevisiae
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A flow cytometric method for estimating S-phase duration in plants.

Leigh Mickelson-Young1, Emily Wear2, Patrick Mulvaney2

  • 1Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC 27695, USA lamickel@ncsu.edu.

Journal of Experimental Botany
|October 5, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a direct method to measure the S-phase duration, the DNA synthesis stage of the cell cycle, in plants using EdU labeling and flow cytometry. The new technique provides consistent estimates across species with vastly different genome sizes.

Keywords:
ArabidopsisEdUS-phase durationbarleyflow cytometrymaizereplication timingricewheat.

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Area of Science:

  • Plant biology
  • Cell cycle research
  • Molecular genetics

Background:

  • S-phase duration is crucial for understanding cell proliferation and DNA replication.
  • Existing plant S-phase duration estimates often rely on indirect methods.
  • Direct measurement methods are needed for accurate plant cell cycle kinetics.

Purpose of the Study:

  • To develop and apply a direct method for estimating S-phase duration in plants.
  • To analyze S-phase duration in various plant species using a novel technique.
  • To compare S-phase duration estimates across species with differing genome sizes.

Main Methods:

  • Pulse-labeling with 5-ethynyl-2'-deoxyuridine (EdU), a thymidine analog.
  • Analyzing the time course of DNA replication using bivariate flow cytometry.
  • Tracking EdU-labeled S-phase nuclei to determine DNA content transitions.

Main Results:

  • Successfully applied the EdU labeling and flow cytometry method to maize, rice, barley, wheat, and Arabidopsis.
  • Obtained direct estimates of S-phase duration in plant root tips and cell cultures.
  • Found remarkably consistent S-phase duration estimates across species, despite a >40-fold variation in genome size.

Conclusions:

  • The developed method offers a direct and reliable way to measure plant S-phase duration.
  • Plant S-phase duration shows relative conservation across species with diverse genome sizes.
  • This technique advances the study of cell cycle kinetics and DNA replication timing in plants.