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Efficient Sporulation of Saccharomyces cerevisiae in a 96 Multiwell Format
08:54

Efficient Sporulation of Saccharomyces cerevisiae in a 96 Multiwell Format

Published on: September 17, 2016

The Saccharomyces cerevisiae CLB5 promoter contains two middle sporulation elements (MSEs) that are differentially

Sheetal A Raithatha1, David T Stuart

  • 1Department of Biochemistry, 561 Medical Sciences Building, University of Alberta, Edmonton, Alberta, T6G 2H7 Canada.

Yeast (Chichester, England)
|March 11, 2008
PubMed

Insights

The transcription factor Ndt80 binds to middle sporulation elements (MSEs) in the CLB5 promoter. While crucial for CLB5 induction during yeast sporulation, this binding is not essential for DNA replication or cell division.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Cell Cycle Regulation

Background:

  • B-type cyclins Clb5 and Clb6 are key regulators of DNA replication in Saccharomyces cerevisiae sporulation.
  • The CLB5 gene's expression is primarily induced by the transcription factor Ndt80 during mid-sporulation.

Purpose of the Study:

  • To analyze the CLB5 promoter and identify Ndt80 binding sites.
  • To investigate the in vivo function of identified Ndt80 binding sites in CLB5 regulation.

Main Methods:

  • Promoter analysis of the CLB5 gene.
  • In vitro binding assays for Ndt80 and identified promoter elements.
  • In vivo functional analysis of promoter mutations during yeast meiosis and sporulation.

Main Results:

  • Two middle sporulation elements (MSEs) were identified as Ndt80 binding sites within the CLB5 promoter.
  • Both MSEs bind Ndt80 in vitro, but exhibit differential regulatory function in vivo.
  • Mutating both MSEs significantly reduced CLB5 transcription induction without impairing meiosis or sporulation progression.

Conclusions:

  • Ndt80-dependent induction of CLB5 is not essential for DNA replication or chromosome division during yeast sporulation.
  • The identified MSEs are important cis-acting elements for Ndt80-mediated CLB5 transcriptional activation.
  • Differential in vitro and in vivo activity of MSEs suggests complex regulatory mechanisms.

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