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Related Experiment Videos

Functional cDNA libraries from Drosophila embryos.

N H Brown1, F C Kafatos

  • 1Department of Cellular and Developmental Biology, Harvard University Biological Laboratories, Cambridge, MA 02138.

Journal of Molecular Biology
|September 20, 1988
PubMed
Summary
This summary is machine-generated.

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This study presents an efficient method for cloning complementary DNAs (cDNAs) into plasmid vectors. The technique enables the production of full-length RNA for protein expression and characterization.

Area of Science:

  • Molecular Biology
  • Gene Cloning
  • Recombinant DNA Technology

Background:

  • Efficient cloning of complementary DNAs (cDNAs) is crucial for gene expression studies.
  • Existing methods often face limitations in orientation control and efficiency.
  • Plasmid vectors with phage SP6 and T7 polymerase promoters are widely used for transcription.

Purpose of the Study:

  • To develop a highly efficient technique for cloning cDNAs in a defined orientation into plasmid vectors.
  • To enable the production of full-length RNA transcripts for in vitro translation and protein characterization.
  • To facilitate the generation of antisense RNA using T7 RNA polymerase.

Main Methods:

  • Modified cloning strategy using a synthetic oligonucleotide linker/primer for first-strand cDNA synthesis primed from the poly(A) tail.

Related Experiment Videos

  • RNA hydrolysis followed by dG tailing of cDNA.
  • Annealing cDNA to two specific vector fragments with complementary dC tails and cohesive ends.
  • Second-strand cDNA synthesis using the large fragment of DNA polymerase I.
  • Ligation and transformation to create cDNA libraries.

    • Main Results:

    • Achieved high efficiency, generating libraries of up to 8 x 10^6 independent transformants from 1 microgram of Drosophila poly(A)+ RNA.
    • Successfully cloned large (4.3 to 6.5 kb) and low-abundance cDNAs.
    • Produced full-length RNA transcripts via SP6 RNA polymerase, leading to efficient in vitro translation of complete, unfused proteins.
    • Demonstrated the capability to produce antisense RNAs using T7 RNA polymerase.

    Conclusions:

    • The developed method provides a highly efficient and versatile approach for directional cDNA cloning.
    • This technique facilitates rapid characterization of cloned genes through protein expression and analysis.
    • The ability to generate both sense and antisense RNA transcripts expands its utility in molecular biology research.