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J. Virol., Aug 1996, 5701-5705, Vol 70, No. 8
RK Naviaux, E Costanzi, M Haas and IM Verma
We describe the construction and characterization of retroviral vectors and
packaging plasmids that produce helper-free retrovirus with titers of 1 X
10(6) to 5 X 10(6) within 48 h. These vectors contain the immediate early
region of the human cytomegalovirus enhancer-promoter fused to the Moloney
murine leukemia virus long terminal repeat at the TATA box in the 5' U3
region, yielding the pCL promoter. By selecting vectors designed to express
genes from one of four promoters (dihydrofolate reductase, Rous sarcoma
virus, long terminal repeat, or cytomegalovirus), the pCL system permits
the investigator to control the level of gene expression in target cells
over a 100-fold range, while maintaining uniformly high titers of virus
from transiently transfected producer cells. The pCL packaging plasmids
lack a packaging signal (delta-psi) and include an added safety
modification that renders them self-inactivating through the deletion of
the 3' U3 enhancer. Ecotropic, amphotropic (4070A), and amphotropic-mink
cell focus-forming hybrid (10A1) envelope constructions have been prepared
and tested, permitting flexible selection of vector pseudotype in
accordance with experimental needs. Vector supernatants are free of helper
virus and are of sufficiently high titer within 2 days of transient
transfection in 293 cells to permit infection of more than 50% of randomly
cycling target cells in culture. We demonstrated the efficacy of these
vectors by using them to transfer three potent cell cycle control genes
(the p16(INK4A), p53, and Rb1 genes) into human glioblastoma cells.
Copyright © 1996, American Society for Microbiology
The pCL vector system: rapid production of helper-free, high-titer, recombinant retroviruses
Laboratory of Genetics, The Salk Institute, San Diego, California 92186, USA.
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