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Related Experiment Videos

DNA sequences shaped by selection for stability.

Martin Ackermann1, Lin Chao

  • 1Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America. Martin.Ackermann@env.ethz.ch

Plos Genetics
|March 7, 2006
PubMed
Summary
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Genome sequences avoid unstable nucleotide repeats, indicating selection favors stability over variability. This suggests a strong influence of error avoidance on how genetic information is encoded.

Area of Science:

  • Genomics and Molecular Biology
  • Evolutionary Genetics

Background:

  • Nucleotide sequence stability influences replication and expression fidelity.
  • The prevalence of stable versus unstable sequences may reflect selection for or against errors.

Purpose of the Study:

  • To investigate whether protein-encoding nucleotide sequences are biased towards stability or instability.
  • To determine if codon usage avoidance of mononucleotide repeats is driven by selection or neutral processes.

Main Methods:

  • Screened genome sequences across diverse organisms.
  • Analyzed the presence of mononucleotide repeats as a key determinant of sequence stability.
  • Evaluated codon usage patterns in relation to mononucleotide repeat emergence.

Main Results:

Related Experiment Videos

  • Identified a significant bias in codon usage that actively avoids the emergence of mononucleotide repeats.
  • Demonstrated that this avoidance is attributable to selective pressures, not random genetic drift.
  • Found that protein-encoding sequences are preferentially stable.

Conclusions:

  • Selection for genomic stability, specifically against replication and expression errors, substantially shapes genome encoding.
  • The observed bias indicates that error avoidance is a more significant evolutionary force than selection for genetic variation in this context.