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Mol. Cell. Biol., 02 1995, 704-710, Vol 15, No. 2
I Whitehead, H Kirk and R Kay
a cDNA library transfer system based on retroviral vectors has been
developed for expression cloning in mammalian cells. The use of retroviral
vectors results in stable cDNA transfer efficiencies which are at least
100-fold higher than those achieved by transfection and therefore enables
the transfer and functional screening of very large libraries. In our
initial application of retroviral transfer of cDNA libraries, we have
selected for cDNAs which induce oncogenic transformation of NIH 3T3
fibroblasts, as measured by loss of contact inhibition of proliferation.
Nineteen different transforming cDNAs were isolated from a total of 300,000
transferred cDNA clones. Three of these cDNAs were derived from known
oncogenes (raf-1, lck, and ect2), while nine others were derived from genes
which had been cloned previously but were not known to have the ability to
transform fibroblasts (beta-catenin, thrombin receptor, phospholipase
C-gamma 2 and Spi-2 protease inhibitor genes). The Spi-2 cDNA was expressed
in antisense orientation and therefore is likely to act as an inhibitor of
an endogenous transformation suppressor. Seven novel cDNAs with
transforming activities, including those for three new members of the CDC24
family of guanine nucleotide exchange factors, were also cloned from the
retroviral cDNA libraries. Retroviral transfer of libraries should be
generally useful for cloning cDNAs which confer selectable phenotypes on
many different types of mammalian cells.
Copyright © 1995, American Society for Microbiology
Expression cloning of oncogenes by retroviral transfer of cDNA libraries
Department of Medical Genetics, University of British Columbia, Canada.
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