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Related Experiment Videos

Identifying transcribed sequences in arrayed bacteriophage or cosmid libraries.

U Hochgeschwender1, M B Brennan

  • 1National Institute of Mental Health, Bethesda, Maryland, USA.

Current Protocols in Human Genetics
|April 23, 2008
PubMed
Summary
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This study details a method for finding specific DNA sequences within genomic libraries using a radiolabeled complementary DNA (cDNA) probe. This technique aids in identifying bacteriophage or cosmid clones containing target genetic information from cells.

Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Identifying specific gene sequences within complex genomes is crucial for molecular biology research.
  • Genomic libraries, such as phage and cosmid libraries, provide a collection of DNA fragments for screening.
  • Differentiating between unique and repetitive DNA sequences is essential for accurate gene identification.

Purpose of the Study:

  • To describe a method for identifying bacteriophage or cosmid clones containing specific mRNA sequences.
  • To enable the isolation of target DNA sequences from a cell line or tissue.
  • To provide a reliable technique for screening genomic libraries.

Main Methods:

  • Synthesis of a radiolabeled complementary DNA (cDNA) probe via reverse transcription of poly(A)+ RNA.

Related Experiment Videos

  • Pre-purification of the cDNA probe using DNA-cellulose to eliminate repetitive sequences.
  • Hybridization analysis of phage or cosmid genomic library filters with the purified probe.
  • Southern blot analysis of restriction enzyme-digested DNA from positive clones using the same probe.

    • Main Results:

    • Successful identification of bacteriophage or cosmid clones containing sequences of interest.
    • Demonstration of a method to isolate specific genetic material from cellular mRNA.
    • Validation of the probe's ability to screen both initial libraries and confirm positive clones via Southern blotting.

    Conclusions:

    • The described method provides an effective approach for isolating specific DNA sequences from genomic libraries.
    • The use of a purified cDNA probe significantly enhances the accuracy of identifying target clones.
    • This technique is valuable for researchers studying gene expression and isolating specific genes.