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Related Experiment Videos

Modular structural elements in the replication origin region of Tetrahymena rDNA

C Du1, R P Sanzgiri, W L Shaiu

  • 1Department of Zoology and Genetics, Iowa State University, Ames 50011, USA.

Nucleic Acids Research
|May 25, 1995
PubMed
Summary

Computer analyses identified a DNA replication origin in Tetrahymena thermophila. This protozoan origin shares conserved structural elements with eukaryotic chromosomal origins, suggesting a common evolutionary feature.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA replication origins are crucial for cell division.
  • Eukaryotic origins often contain conserved modular sequence elements.
  • The Tetrahymena thermophila rRNA gene 5'NTS was a candidate replication origin.

Purpose of the Study:

  • To investigate the DNA replication origin in Tetrahymena thermophila.
  • To identify structural elements within the 5'NTS region.
  • To determine if these elements are conserved across eukaryotes.

Main Methods:

  • Computer analysis of DNA sequences.
  • Mung bean nuclease sensitivity assays.
  • Electrophoresis to detect bent DNA.
  • In vitro nuclear matrix binding assays.

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Main Results:

  • Identified a potential DNA unwinding element (DUE) and bent DNA segments in the 5'NTS.
  • Localized hypersensitive sites within the DUE-like element.
  • Confirmed association of the 5'NTS with the nuclear matrix in vitro.

Conclusions:

  • The Tetrahymena 5'NTS contains structural features characteristic of eukaryotic replication origins.
  • These findings suggest conserved modular elements at eukaryotic chromosomal origins.
  • This study provides direct evidence in a protozoan origin region.