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Selection acts on DNA secondary structures to decrease transcriptional mutagenesis.

Claire Hoede1, Erick Denamur, Olivier Tenaillon

  • 1INSERM U722 and Université Paris 7--Denis Diderot, Faculté de Médecine, Site Xavier Bichat, Paris, France.

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|November 7, 2006
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Summary
This summary is machine-generated.

DNA secondary structures reduce transcription-driven mutations. Natural selection favors these structures, especially in highly expressed genes, controlling mutation rates and influencing synonymous mutations.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Single-stranded DNA is more susceptible to mutations than double-stranded DNA.
  • Transcription involves transient single-stranded DNA, increasing mutagenesis risk.
  • Intra-strand secondary structures can protect DNA bases from mutation.

Purpose of the Study:

  • To investigate the role of intra-strand secondary structures in modulating transcription-driven mutagenesis.
  • To define an index for transcription-driven mutability based on secondary structures.
  • To explore how natural selection influences these structures in gene evolution.

Main Methods:

  • Analysis of complete Escherichia coli genome sequences.
  • Development of an index to quantify transcription-driven mutability.
  • Statistical analysis of secondary structure frequency in genes.

Main Results:

  • Intra-strand secondary structures are prevalent and can define an index of transcription-driven mutability.
  • Natural selection favors reduced mutagenesis by increasing the occurrence of these structures.
  • This selection is stronger in highly expressed genes.

Conclusions:

  • Intra-strand secondary structures provide a sequence-dependent mechanism to control mutation rates.
  • A novel form of selection acts on synonymous mutations by favoring structures that reduce mutagenesis.
  • These findings offer insights into the evolution of mutation rates and gene expression.