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Hidden antisense genes in Pseudomonas fluorescens are crucial for soil colonization. These non-predicted genes, like cosA, encode proteins essential for bacterial ecological success.

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Antisense transcription is increasingly recognized in eukaryotes, but less understood in prokaryotes.
  • Pseudomonas fluorescens, an environmental generalist, has a poorly understood genetic basis for its ecological success.
  • Previously identified 'cryptic' or 'non-predicted' genes in P. fluorescens lacked easily recognizable promoters.

Purpose of the Study:

  • To investigate transcription from both sense and antisense strands at non-predicted gene loci in P. fluorescens.
  • To determine if these hidden antisense genes encode functional proteins.
  • To assess the role of a novel antisense gene (iiv14, designated cosA) in soil colonization.

Main Methods:

  • Reverse transcription PCR (RT-PCR) to confirm transcription from both DNA strands.
  • Poly-histidine tagging to identify encoded proteins.
  • Mutational and complementation studies to evaluate gene function.

Main Results:

  • Transcription confirmed from both sense and antisense strands at six non-predicted gene loci.
  • The hidden antisense gene iiv14 (cosA) encodes a protein essential for soil colonization.
  • Multiple copies of cosA enhanced the speed of soil colonization, while a stop codon abolished complementation.

Conclusions:

  • Bacterial genomes, like eukaryotic ones, may be more densely coded than currently recognized.
  • Hidden antisense genes represent a significant, previously overlooked layer of genetic information.
  • The identified antisense gene cosA plays a vital role in the ecological adaptation of P. fluorescens to soil environments.