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Related Experiment Videos

Development of a highly efficient expression cDNA cloning system: application to oncogene isolation.

T Miki1, T P Fleming, M Crescenzi

  • 1Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|June 15, 1991
PubMed
Summary

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A novel expression cDNA cloning system enables high-complexity library generation and efficient plasmid rescue. This system identified a new oncogene formed by recombination involving the B-raf protooncogene in hepatocellular carcinoma.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Cancer research often requires identifying oncogenes responsible for cellular transformation.
  • Developing efficient cloning systems is crucial for isolating and characterizing these genes.

Purpose of the Study:

  • To develop a novel expression cDNA cloning system for generating high-complexity libraries.
  • To apply this system to identify oncogenes from hepatocellular carcinoma DNA.

Main Methods:

  • Construction of a unidirectionally inserted cDNA library from a transformed NIH 3T3 cell line.
  • Transfection of NIH 3T3 cells with the library DNA.
  • Rescue and sequence analysis of plasmids from transformed foci.
  • Genetic analysis of oncogene formation.

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Main Results:

  • The expression cloning system efficiently generated high-complexity cDNA libraries with unidirectionally inserted fragments.
  • Several transforming foci were detected, yielding identical plasmids with oncogenic activity.
  • Sequence analysis revealed the oncogene resulted from recombination between an unknown gene and the mouse B-raf protooncogene homologue.
  • The genetic rearrangement was detected in primary transformants, indicating oncogene formation occurred within the tumor.

Conclusions:

  • The developed mammalian expression cloning system is highly effective for isolating biologically significant cDNAs.
  • The identified oncogene arose from a tumor-specific genetic event involving B-raf.
  • This system has broad applicability for discovering novel genes involved in various biological processes and diseases.