Gene transfer in bovine blastocysts using replication-defective retroviral vectors packaged with Gibbon ape leukemia virus envelopes.
With this work we demonstrate that murine leukemia virus (MLV)-based replication-defective retroviral vectors encapsidated with Gibbon ape leukemia virus (GaLV) envelopes are significantly more infectious to bovine embryonic trachea (EBTr) cells than vectors encapsidated with murine xenotropic envelope proteins. In a test of internal promoter activity in an MLV retroviral vector, the rat beta-actin promoter was shown to be better than the herpes simplex virus type 1 thymidine kinase (TK) and human cytomegalovirus (CMV) immediate early promoters for the expression of an E. coli beta-galactosidase marker gene in bovine target cells. By co-culture of bovine blastocysts and virus-producing cells, or by culture of embryos in the medium harvested from virus-producing cells, we transferred the E. coli beta-galactosidase gene into trophoblasts and also into inner cell mass (ICM) cells of a bovine embryo through the infection of the MLV-based replication-defective retroviruses encapsidated with GaLV envelope proteins. The infection was confirmed by the expression of the E. coli beta-galactosidase gene under a beta-actin internal promoter. In addition, co-culture of ICM cells with virus-producing cells resulted in differentiation of ICM cells into embryoid bodies expressing the marker genes.
Kim
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Endocrinology and Reproductive Physiology Program, University of Wisconsin, Madison 53706.
Leibfried-Rutledge
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ML
First
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D000199:Actins / Q000235:genetics; D000818:Animals; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics; D001755:Blastocyst; D002417:Cattle; D002460:Cell Line; D017077:Culture Media, Conditioned; D003587:Cytomegalovirus / Q000235:genetics; D003673:Defective Viruses / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D005822:Genetic Vectors; D006378:Helper Viruses / Q000502:physiology; D009052:Leukemia Virus, Murine / Q000235:genetics*; D009924:Organ Culture Techniques; D011401:Promoter Regions, Genetic; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000235:genetics; D015301:Retroviruses, Simian / Q000502:physiology*; D018139:Simplexvirus / Q000235:genetics; D013937:Thymidine Kinase / Q000235:genetics; D014162:Transfection; D014759:Viral Envelope Proteins; D014764:Viral Proteins / Q000235:genetics; D001616:beta-Galactosidase / Q000096:biosynthesis / Q000235:genetics
D000199:Actins; D001426:Bacterial Proteins; D017077:Culture Media, Conditioned; D011993:Recombinant Fusion Proteins; D014759:Viral Envelope Proteins; D014764:Viral Proteins; D013937:Thymidine Kinase; D001616:beta-Galactosidase