Expression of heterologous genes from an IRES translational cassette in replication competent murine leukemia virus vectors
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Expression of heterologous genes from an IRES translational cassette in replication competent murine leukemia virus vectors. / Jespersen, Thomas; Duch, Mogens R.; Carrasco, M L; Warming, S; Pedersen, F S.
In: Gene, Vol. 239, No. 2, 01.11.1999, p. 227-35.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Expression of heterologous genes from an IRES translational cassette in replication competent murine leukemia virus vectors
AU - Jespersen, Thomas
AU - Duch, Mogens R.
AU - Carrasco, M L
AU - Warming, S
AU - Pedersen, F S
PY - 1999/11/1
Y1 - 1999/11/1
N2 - We describe replication competent retroviruses capable of expressing heterologous genes during multiple rounds of infection. An internal ribosome entry site (IRES) from encephalomyocarditis virus was inserted in the U3 region of Akv- and SL3-3-murine leukemia viruses (MLV) to direct translation of neo or the enhanced green fluorescence protein gene (EGFP). Akv-MLV's with IRES-neo and IRES-EGFP cassettes replicated with titers of about 10(6) infectious units/ml while SL3-3-MLV with IRES-neo gave about 10(3)-fold lower titers. Interestingly, RNA analysis showed a drastic reduction in the amount of spliced env mRNA for the SL3-3 derived vector relative to the Akv derived vectors, seemingly contributing to its low replication capacity. The EGFP expressing Akv-MLV was genetically stable for multiple rounds of infection; marker-cassette deletion revertants appeared after several replication rounds and these revertants only slowly became dominant in the virus population.
AB - We describe replication competent retroviruses capable of expressing heterologous genes during multiple rounds of infection. An internal ribosome entry site (IRES) from encephalomyocarditis virus was inserted in the U3 region of Akv- and SL3-3-murine leukemia viruses (MLV) to direct translation of neo or the enhanced green fluorescence protein gene (EGFP). Akv-MLV's with IRES-neo and IRES-EGFP cassettes replicated with titers of about 10(6) infectious units/ml while SL3-3-MLV with IRES-neo gave about 10(3)-fold lower titers. Interestingly, RNA analysis showed a drastic reduction in the amount of spliced env mRNA for the SL3-3 derived vector relative to the Akv derived vectors, seemingly contributing to its low replication capacity. The EGFP expressing Akv-MLV was genetically stable for multiple rounds of infection; marker-cassette deletion revertants appeared after several replication rounds and these revertants only slowly became dominant in the virus population.
KW - 3T3 Cells
KW - Animals
KW - DNA, Viral
KW - Encephalomyocarditis virus
KW - Flow Cytometry
KW - Gene Expression Regulation
KW - Genetic Vectors
KW - Green Fluorescent Proteins
KW - Kanamycin Kinase
KW - Leukemia Virus, Murine
KW - Luminescent Proteins
KW - Mice
KW - Microscopy, Fluorescence
KW - Protein Biosynthesis
KW - RNA
KW - RNA Splicing
KW - Recombinant Fusion Proteins
KW - Transformation, Genetic
KW - Virus Replication
M3 - Journal article
C2 - 10548723
VL - 239
SP - 227
EP - 235
JO - Gene
JF - Gene
SN - 0378-1119
IS - 2
ER -
ID: 33018484