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J. Virol., Jan 1997, 9-16, Vol 71, No. 1
B Scheijen, J Jonkers, D Acton and A Berns
Insertional mutagenesis with Moloney murine leukemia virus (MoMLV) in c-
myc and Pim-1 transgenic mice permits the identification of oncogenes that
collaborate with the transgenes in lymphomagenesis. The recently identified
common insertion site pal-1, in MoMLV-induced lymphomas, is located in a
region in which several independent integration clusters are found: eis-1,
gfi-1, and evi-5. Proviral insertions of MoMLV in the different integration
clusters upregulate the transcriptional activity of the Gfi-1 gene, which
is located within the pal-1 locus. The eis- 1/pal-1/gfi-1/evi-5 locus
serves as a target for MoMLV proviral insertions in pre-B-cell lymphomas of
Emu-myc transgenic mice (20%) and in T-cell lymphomas of H-2K-myc (75%) and
Emu-pim-1 (93%) transgenic mice. Many tumors overexpress both Gfi-1 as well
as Myc and Pim gene family members, indicating that Gfi-1 collaborates with
Myc and Pim in lymphomagenesis. Proviral integrations in the previously
identified insertion site bmi-1 are, however, mutually exclusive with
integrations in the eis-1/pal-1/gfi-1/evi-5 locus. This finding suggests
that Bmi-1 and Gfi-1 belong to the same complementation group in lymphoid
transformation.
Copyright © 1997, American Society for Microbiology
Characterization of pal-1, a common proviral insertion site in murine leukemia virus-induced lymphomas of c-myc and Pim-1 transgenic mice
Division of Molecular Genetics, The Netherlands Cancer Institute, Amsterdam.
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