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Related Experiment Videos

Transcription control reprogramming in genetic backup circuits.

Ran Kafri1, Arren Bar-Even, Yitzhak Pilpel

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

Nature Genetics
|February 22, 2005
PubMed
Summary
This summary is machine-generated.

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Genetic robustness is maintained by paralogs that are expressed differently but can reprogram transcription. Partially shared regulatory motifs enable backup function, reconciling differential expression with organismal resilience.

Area of Science:

  • Molecular Genetics
  • Systems Biology
  • Yeast Genetics

Background:

  • Severe mutations often lack detectable phenotypic effects, a phenomenon termed genetic robustness.
  • Redundant paralogs, genes with similar functions, are hypothesized to provide backup in case of mutation.
  • The expression patterns of these paralogs and their regulatory mechanisms remain incompletely understood.

Purpose of the Study:

  • To investigate the relationship between paralog expression patterns and their backup function in Saccharomyces cerevisiae.
  • To elucidate the transcriptional mechanisms underlying genetic robustness conferred by paralogs.
  • To determine how regulatory motif organization influences paralog backup efficiency.

Main Methods:

  • Analysis of mutant viability and mRNA expression data in yeast.

Related Experiment Videos

  • Comparative analysis of transcriptional reprogramming in response to paralog mutation.
  • Identification and comparison of regulatory motifs controlling paralog gene expression.

    • Main Results:

    • Backup function was primarily provided by paralogs with dissimilar expression patterns across most conditions.
    • Partial coregulation of paralogs in wild-type cells predicted their ability to alter transcription and provide backup.
    • Optimal backup activity was associated with paralogs sharing a partially overlapping set of regulatory motifs, not highly similar or dissimilar sets.

    Conclusions:

    • Differential expression of paralogs does not preclude robust backup function.
    • Transcriptional reprogramming by intact paralogs is a key mechanism for genetic robustness.
    • A specific arrangement of partially shared regulatory motifs balances differential expression with effective paralogous backup.