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Related Experiment Videos

Calling cards for DNA-binding proteins.

Haoyi Wang1, Mark Johnston, Robi David Mitra

  • 1Department of Genetics, Washington University, School of Medicine, Genome Sequencing Center, St Louis, MO 63108, USA.

Genome Research
|July 12, 2007
PubMed
Summary
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Scientists developed a novel method using Ty5 retrotransposon "calling cards" to identify all proteins binding to specific DNA promoter regions in yeast. This technique accurately maps transcription factor binding sites, advancing the study of gene regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Understanding transcriptional regulatory networks is crucial for gene regulation studies.
  • Current methods can identify targets of a single transcription factor but not all proteins binding to a specific DNA promoter.
  • A method to identify all proteins binding to a promoter of interest is needed.

Purpose of the Study:

  • To develop a novel method for identifying all proteins that bind to a specific promoter of interest.
  • To create a system for mapping transcription factor binding sites in the yeast genome.

Main Methods:

  • Developed a method using the yeast retrotransposon Ty5 as a DNA-binding reporter system.
  • Fused DNA-binding proteins to the Sir4 protein to direct Ty5 insertion near binding sites.

Related Experiment Videos

  • Created unique DNA sequences (molecular bar codes) within Ty5 for each transcription factor.
  • Induced Ty5 transposition in yeast cells expressing transcription factor-Sir4 fusions and bar-coded Ty5 elements.
  • Identified deposited Ty5 "calling cards" in specific genomic regions to reveal bound transcription factors.

    • Main Results:

    • The Ty5 calling card method successfully identified known transcription factors binding to specific yeast promoters (GAL1-10, HIS4, PHO5).
    • In the GAL1-10 promoter, only Gal4 calling cards were found.
    • In the HIS4 promoter, only Gcn4 calling cards were identified.
    • In the PHO5 promoter, only Pho4 and Pho2 calling cards were detected.

    Conclusions:

    • The Ty5 calling card system accurately identifies transcription factors binding to specific genomic regions.
    • This method offers a potential solution for mapping all targets of all transcription factors in a single experiment.
    • The approach has significant implications for understanding complex transcriptional regulatory networks.