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Related Experiment Videos

Universal ribotyping method using a chemically labelled oligonucleotide probe mixture

B Regnault1, F Grimont, P A Grimont

  • 1Unité des Entérobactéries, INSERM U 389, Institut Pasteur, Paris.

Research in Microbiology
|October 10, 1998
PubMed
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OligoMix5, a set of five oligonucleotide probes, enables consistent bacterial ribotyping across diverse species by targeting conserved rRNA gene sequences. This tool overcomes limitations in probe reactivity for accurate phylogenetic analysis.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Ribotyping challenges arise from inconsistent probe reactivity with phylogenetically diverse bacterial DNA.
  • Standard ribotyping methods may require lengthy detection for Gram-positive bacteria.

Purpose of the Study:

  • To develop and validate a novel oligonucleotide probe set, OligoMix5, for improved bacterial ribotyping.
  • To assess the efficacy of OligoMix5 in visualizing complete ribotypes from phylogenetically diverse Eubacteria.

Main Methods:

  • OligoMix5 probes were designed to target conserved sequences in 16S and 23S rRNA genes.
  • Bacterial DNA from 13 species was digested, electrophoresed, transferred, and hybridized with OligoMix5 and control probes.
  • Individual oligonucleotide contributions to the ribotype patterns were analyzed.

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Main Results:

  • OligoMix5 visualized comparable banding patterns across diverse bacterial DNA with consistent intensity.
  • OligoMix5 generated complete ribotypes identical to 16S + 23S rRNA and pKK3535 probes.
  • Individual oligonucleotides within OligoMix5 produced one to four distinct patterns per sample.

Conclusions:

  • OligoMix5 is an effective tool for ribotyping phylogenetically diverse Eubacteria, overcoming limitations of existing methods.
  • The probe set provides complete ribotypes, simplifying bacterial identification and phylogenetic studies.
  • DNA from Xenorhabdus sp. CIP 105189 is proposed for quality control of OligoMix5 probes.