摘要:
The present invention provides a vector for expressing at least a first and a second nucleic acid molecules which exhibit a percentage of homology of approximately 80% or greater than 80% over a portion of 40 or more continuous nucleotides and wherein said first nucleic acid molecule and/or said second nucleic acid molecule is modified so as to reduce said percentage of homology to less than 75%. The present invention also relates to substantially isolated nucleic acid molecules comprising a nucleotide sequence as defined in any of SEQ ID NO: 9-15 and 66-69. It also provides a host cell and a pharmaceutical composition comprising such a nucleic acid molecule or vector as well as their use for therapeutic or preventive purposes.
摘要:
PROBLEM TO BE SOLVED: To provide a G0 transgenic chimera bird producing an antibody.SOLUTION: There are provided G0 transgenic chimeric birds which have an antibody gene having been transferred thereinto by using a retrovirus vector with a lack of replicability and produce the antibody by expressing the transferred gene; a process for producing an antibody by collecting the antibody express ed by the constructed G0 transgenic chimeric birds; and a method of constructing G0 transgenic chimeric birds by incubating fertilized bird eggs and injecting a retrovirus vector into these fertilized eggs excluding immediately after the initiation of the incubation. Namely, G0 transgenic chimeric birds having an antibody gene transferred thereinto by using a retrovirus vector with a lack of replicability and producing the antibody by expressing the thus transferred gene.
摘要:
The present invention relates generally to activating gene expression or causing over-expression of a gene by recombination methods in situ. The invention also relates generally to methods for expressing an endogenous gene in a cell at levels higher than those normally found in the cell. In one embodiment of the invention, expression of an endogenous gene is activated or increased following integration into the cell, by non-homologous or illegitimate recombination, of a regulatory sequence that activates expression of the gene. In another embodiment, the expression of the endogenous gene may be further increased by co-integration of one or more amplifiable markers, and selecting for increased copies of the one or more amplifiable markers located on the integrated vector. The invention also provides methods for the identification and expression of genes undiscoverable by current methods since no target sequence is necessary for integration. The invention also provides methods for isolation of nucleic acid molecules (particularly cDNA molecules) encoding transmembrane proteins, and for isolation of cells expressing such transmembrane proteins which may be heterologous transmembrane proteins. The invention also relates to isolated genes, gene products, nucleic acid molecules, and compositions comprising such genes, gene products and nucleic acid molecules, that may be used in a variety of therapeutic and diagnostic applications. Thus, by the present invention, endogenous genes, including those associated with human disease and development, may be activated and isolated without prior knowledge of the sequence, structure, function, or expression profile of the genes.
摘要:
Vectors and methods for the production of influenza viruses suitable as recombinant influenza vaccines in cell culture are provided. Bi-directional expression vectors for use in a multi-plasmid influenza virus expression system are provided. Additionally, the invention provides methods of producing influenza viruses with enhanced ability to replicate in embryonated chicken eggs and/or cells (e.g., Vero and/or MDCK) and further provides influenza viruses with enhanced replication characteristics. In addition, the present invention includes an improved method of rescue, wherein animal cells (e.g., SF Vero cells) are electroporated with plasmids and vectors of the invention.