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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Determination of S-Phase Duration Using 5-Ethynyl-2'-deoxyuridine Incorporation in Saccharomyces cerevisiae
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Visualization of the Nucleolus Using Ethynyl Uridine.

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Frontiers in Plant Science
|March 6, 2018
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Summary

This study presents a new method for visualizing nascent RNA in plant nucleoli using 5-ethynyl uridine (EU) labeling. This technique effectively highlights the nucleolus without requiring transgenic plants, simplifying RNA transcript visualization.

Keywords:
Arabidopsis thalianaclick iTnucleolusnucleustranscription

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Area of Science:

  • Plant molecular biology
  • Cellular imaging techniques
  • Nucleolar and transcriptional research

Background:

  • Innovative methodologies allow direct visualization of cellular processes like replication and transcription in intact tissues.
  • Click chemistry, using 5-ethynyl-2'-deoxyuridine (EdU) for DNA and 5-ethynyl uridine (EU) for RNA, is a key technique.
  • While EdU labeling for DNA replication is well-established in plants, EU labeling for nascent RNA is less developed.

Purpose of the Study:

  • To present a novel protocol for labeling nucleolar RNA transcripts in plants using EU.
  • To demonstrate the effectiveness of EU in highlighting the nucleolus.
  • To offer an alternative to creating transgenic plants for nucleolar visualization.

Main Methods:

  • Application of 5-ethynyl uridine (EU) labeling directly to intact plant tissues.
  • Utilizing click chemistry for detection of nascent RNA transcripts.
  • Direct visualization of nucleolar RNA without genetic modification.

Main Results:

  • EU labeling effectively highlights the plant nucleolus.
  • The protocol allows for direct visualization of nucleolar RNA transcripts.
  • Successful labeling of nascent RNA in the nucleolus was achieved.

Conclusions:

  • The developed EU labeling protocol provides an efficient method for visualizing nucleolar RNA in plants.
  • This technique circumvents the need for transgenic plant lines, simplifying experimental procedures.
  • The method offers a valuable tool for studying nucleolar function and RNA metabolism in plants.