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Diverse two-dimensional input functions control bacterial sugar genes.

Shai Kaplan1, Anat Bren, Alon Zaslaver

  • 1Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot 76100, Israel.

Molecular Cell
|April 1, 2008
PubMed
Summary
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Researchers mapped gene input functions in E. coli, revealing diverse shapes and nonmonotonic responses to signals. Most functions showed a separable form, simplifying the understanding of gene regulation logic.

Area of Science:

  • Systems biology
  • Molecular biology
  • Genetics

Background:

  • Cells regulate gene expression in response to external signals.
  • The relationship between signal levels and gene transcription is termed the gene's input function.
  • Multidimensional input functions are common due to multiple signal inputs.

Purpose of the Study:

  • To map high-resolution, two-dimensional input functions for 19 sugar-utilization genes in living E. coli.
  • To understand the complexity and diversity of gene regulatory logic.

Main Methods:

  • High-resolution mapping of two-dimensional input functions.
  • Analysis of 19 sugar-utilization genes in E. coli.

Main Results:

Related Experiment Videos

  • Discovered diverse and intricate shapes of gene input functions.
  • Observed nonmonotonic input functions, peaking at intermediate signal levels.
  • Found that most input functions exhibit separation of variables, being products of single-input functions.

    • Conclusions:

    • Gene regulation logic is complex and varied, even with similar regulatory circuits.
    • The separable nature of input functions provides a simplified model for gene regulation.
    • This study provides a foundation for mapping gene regulation in other biological systems.