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Deciphering transcriptional regulatory elements that encode specific cell cycle phasing by comparative genomics

Chaim Linhart1, Ran Elkon, Yosef Shiloh

  • 1School of Computer Science, Tel Aviv University, Tel Aviv, Israel.

Cell Cycle (Georgetown, Tex.)
|November 19, 2005
PubMed
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Researchers identified conserved gene regulatory elements controlling cell cycle progression across species. They found specific modules, like E2F for G1/S phase and CHR-NF-Y for G2/M phase, crucial for cell cycle timing.

Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • Transcriptional regulation is key to cell cycle progression.
  • Comparative genomics offers a powerful approach to identify functional regulatory elements.

Purpose of the Study:

  • To decipher conserved transcriptional regulatory elements controlling cell cycle phasing using comparative genomics.
  • To identify specific cis-regulatory modules and their target genes associated with distinct cell cycle phases.

Main Methods:

  • Genome-wide analysis of promoter sequences from 12 diverse organisms.
  • Comparative genomics to identify conserved transcriptional modules.
  • Analysis of specific transcription factor binding sites (E2F, CHR-NF-Y, B-Myb).

Related Experiment Videos

Main Results:

  • Identified conserved transcriptional modules dictating cell cycle gene expression.
  • Demonstrated E2F signal specificity for G1/S phase gene expression across species.
  • Revealed a CHR-NF-Y module for G2/M phase gene expression, conserved in vertebrates.
  • Found B-Myb binding sites in CHR-NF-Y targets, suggesting a regulatory role.

Conclusions:

  • Novel conserved modules controlling cell cycle phasing have been identified.
  • Specific regulatory elements (E2F, CHR-NF-Y) precisely determine gene expression timing in the cell cycle.
  • This study provides high-specificity identification of putative target genes for these regulatory modules.