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Recombination-based assay (RBA) for screening bacteriophage lambda libraries.

D M Kurnit1

  • 1University of Michigan Medical Center, Ann Arbor, Michigan, USA.

Current Protocols in Molecular Biology
|February 12, 2008
PubMed
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This study introduces a recombination-based assay (RBA) for efficiently screening bacteriophage lambda libraries for sequence homology. The RBA rapidly identifies homologous sequences, enabling targeted gene discovery and recovery.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Screening complex bacteriophage lambda libraries for specific DNA sequences is crucial for gene discovery.
  • Existing methods can be time-consuming and less efficient for large libraries.
  • Homologous recombination offers a potential mechanism for targeted sequence identification.

Purpose of the Study:

  • To develop and validate a novel recombination-based assay (RBA) for efficient screening of bacteriophage lambda libraries.
  • To enable rapid identification of homologous sequences within complex genomic libraries.
  • To facilitate the recovery of specific genes of interest from lambda phage libraries.

Main Methods:

  • Construction of a specialized plasmid containing the target sequence.

Related Experiment Videos

  • Screening of a bacteriophage lambda library against the plasmid using homologous recombination.
  • Selection of recombinant phages capable of propagating on a specific bacterial strain (DM21) via plasmid-encoded suppression.
  • Recovery of the target sequence using PCR amplification after reversal of the recombination event.

    • Main Results:

    • The RBA demonstrated efficient screening of 10^6 to 10^7 plaque-forming units (pfu) in multiple petri dishes.
    • Homology detection required only >25 base pairs, allowing for sensitive identification of related sequences.
    • Successful selection and recovery of bacteriophages containing the target sequence were achieved.
    • The assay facilitates counterselection, yielding the gene product with its plasmid carrier deleted.

    Conclusions:

    • The recombination-based assay (RBA) provides a rapid, efficient, and sensitive method for screening complex lambda phage libraries for sequence homology.
    • This technique significantly enhances the discovery and recovery of specific genes from large genomic libraries.
    • The RBA is a valuable tool for molecular biologists and geneticists engaged in gene cloning and functional genomics.