Chemistry: molecular biology and microbiology – Process of mutation – cell fusion – or genetic modification – Introduction of a polynucleotide molecule into or...
Reexamination Certificate
2005-10-18
2005-10-18
Winkler, Ulrike (Department: 1648)
Chemistry: molecular biology and microbiology
Process of mutation, cell fusion, or genetic modification
Introduction of a polynucleotide molecule into or...
C435S069100, C435S320100, C435S457000, C435S466000, C536S023100, C536S023400, C536S023720
Reexamination Certificate
active
06955919
ABSTRACT:
Novel packaging cell lines which produce recombinant retrovirus, free of detectable helper-virus are disclosed. Also disclosed are methods of making the cell lines and methods of producing recombinant retroviruses from the cell lines. Retroviruses produced by the cell lines include lentiviruses, such as HIV, capable of transfering heterologous DNA to a wide range of non-dividing cells. The packaging cells contain at least three vectors which collectively encode retroviral gag, pol, and env proteins, wherein the gag and pol genes are separated, in part, onto two or more different vectors. This is made possible by fusing Vpr or Vpx to pol proteins separated from gag so that the proteins are targeted to assembling virions. Among other advantages, the packaging cells provide the benefit of increased safety when used in human gene therapy by virtually eliminating the possibility of molecular recombination leading to production of replication-competant helper virus.
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Leboulch Philippe
Westerman Karen
Genetix Pharmaceuticals, Inc.
Lahive & Cockfield LLP
Remillard, Esq. Jane E.
Russell, Esq. Hathaway P.
Winkler Ulrike
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