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Related Experiment Videos

Improved method for polynucleotide probe-based cell sorting, using DNA-coated microplates.

K Zwirglmaier1, W Ludwig, K-H Schleifer

  • 1Lehrstuhl für Mikrobiologie, Technische Universität München, 85350 Freising, Germany.

Applied and Environmental Microbiology
|January 9, 2004
PubMed
Summary
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We developed a novel method to sort bacterial cells without culturing them. This technique uses labeled probes to capture and isolate specific cells based on their genetic material, enabling separation by phylogenetic or DNA traits.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Culturing bacteria is essential for studying them, but many species are difficult or impossible to grow in lab conditions.
  • Cultivation-independent methods are needed to access the full diversity of microbial communities.
  • Existing methods for sorting specific bacterial cells can be inefficient or lack specificity.

Purpose of the Study:

  • To develop an improved cultivation-independent method for sorting bacterial cells.
  • To enable the isolation of specific bacterial cells based on their genetic makeup.
  • To demonstrate the versatility of the method for different genetic targets.

Main Methods:

  • In situ hybridization using polynucleotide transcript probes to label target bacterial cells.

Related Experiment Videos

  • Utilizing the external portion of the probe for cell capture.
  • Immobilizing labeled cells in microplates coated with complementary DNA for secondary hybridization and capture.
  • Applying probes targeting ribosomal RNA (rRNA), a plasmid-borne beta-lactamase gene, and a chromosome-borne glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene.

    • Main Results:

    • Successfully sorted bacterial cells from artificial mixtures using the developed method.
    • Demonstrated cell separation based on phylogenetic parameters using rRNA-targeted probes.
    • Showcased the ability to separate cells based on other DNA-encoded traits, such as specific genes (beta-lactamase, GAPDH).
    • The technique effectively isolated target cells by leveraging the probe's external sequence.

    Conclusions:

    • The developed method offers an effective approach for cultivation-independent bacterial cell sorting.
    • This technique allows for bacterial separation based on both phylogenetic and functional genetic characteristics.
    • The method holds promise for studying unculturable bacteria and analyzing microbial communities with greater precision.