Abstract: The present invention provides novel regulatory elements and vectors for the expression of one or more proteins in a host cell. The present invention also provides methods for expressing one or more proteins, such as antibodies, in a host cell. These methods utilize the novel regulatory elements and vectors of the present invention for the expression of proteins in a host cell. The host cells are used for producing various protein products, including but not limited to pharmaceutical proteins, antibodies, variants of proteins for use in screening assays, and for direct use in high throughput screening.

Abstract: The present invention relates to the production of proteins in host cells, and more particularly to host cells containing multiple integrated copies of an integrating vector. Suitable integrating vectors for use in the present invention include retrovirus vectors, lentivirus vectors, transposon vectors, and adeno-associated virus vectors. Methods are provided in which the host cells are prepared by using the integrating vectors at a high multiplicity of infection. The host cells are useful for producing pharmaceutical proteins, variants of proteins for use in screening assays, and for direct use in high throughput screening.

Abstract: The present invention relates to the production of proteins in host cells, and, more particularly to host cells containing multiple integrated copies of an integrating vector. Suitable integrating vectors for use in the present invention include retrovirus vectors, lentivirus vectors, transposon vectors, and adeno-associated virus vectors. Methods are provided in which the host cells are prepared by using the integrating vectors at a high multiplicity of infection. The host cells are useful for producing pharmaceutical proteins, variants of proteins for use in screening assays, and for direct use in high throughput screening.

Abstract: The present invention relates to non-vaccinal and non-pharmacologic compositions and methods for controlling complex retroviral infections. In particular, the present invention provides transgenic animals expressing a transdominant negative Rex gene product that inhibits retroviral replication.

Abstract: The present invention relates to the production of proteins in host cells, and more particularly to host cells containing multiple integrated copies of an integrating vector comprising an exogenous gene and methods of making such host cells by serial transduction or transfection. The present invention further provides methods of expressing increased levels of protein in host cells using such vectors.

Abstract: The present invention relates to the production of antibody libraries. In particular, the present invention relates to the use of integrating retroviral vectors to generate libraries comprising a plurality of combinations of antibody light chains and heavy chains. The present invention thus provides improved methods of generating and screening antibody libraries comprising large numbers of unique antibodies.

Abstract: The present invention provides improved methods and compositions for the generation of transgenic non-human animals. The present invention permits the introduction of exogenous nucleic acid sequences into the genome of unfertilized eggs (e.g., pre-maturation oocytes and pre-fertilization oocytes) by microinjection of infectious retrovirus into the perivitelline space of the egg. The methods of the present invention provide an increased efficiency of production of transgenic animals with a reduced rate of generating animals which are mosaic for the presence of the transgene.

Abstract: The present invention relates to the expression and screening of genomic DNA sequences encoding uncharacterized genes and proteins. The present invention provides systems utilizing unique features of retroviral replication to analyze uncharacterized genes derived from genomic DNA samples. In preferred embodiments, a segment of genomic DNA is inserted between 5′ and 3′ viral long terminal repeats (LTRs) in a vector (e.g., a plasmid, cosmid, or artificial chromosome vector). The resulting vector (or library of vectors containing a plurality of independent genomic sequences) is then introduced into a retroviral packaging cell. The resulting provirus or proteins expression from the provirus are then analyzed.

Abstract: The present invention relates to the production of proteins in host cells, and more particularly to host cells containing multiple integrated copies of an integrating vector comprising an exogenous gene. The present invention further relates to the use of integrating vectors lacking a selectable marker and growth of host cells containing such vectors in the absence of selection. The present invention further provides methods of expressing increased levels of protein in host cells using such vectors.

Abstract: A method is described to transfer a gene encoding a valuable compound, such as a pharmaceutical, into the secretory cells of the mammary gland to produce a new compound into the milk or to alter the composition of the milk. In this method the packaging cell line producing the viral-derived particles is infused into the mammary gland. The packaging cells will attach and survive for a period of time within the mammary gland. While the cells are viable, they will supply a continuous source of viral-derived particles to trans-infect the maximum number of mammary epithelial cells. After a period of time in the mammary gland, both the particles and the packaging cells will be destroyed by natural mechanisms while the trans-infected mammary epithelial cells continue to express gene(s) encoding the valuable compound or gene(s) to alter the composition of the milk.