Pfizer Inc.
SSI CELLS WITH PREDICTABLE AND STABLE TRANSGENE EXPRESSION AND METHODS OF FORMATION

Abstract:

Mammalian cells are described that includes a recombination target site integrated within high integrating locus. Recombinant protein producer cell lines incorporating the mammalian cells and methods for forming the mammalian cells are also described. The high integrating loci have been developed through understanding and mapping of the three dimensional hierarchical structure of chromatin in mammalian cells. The high integrating loci are present in transcriptionally active environments that can provide both chromatin accessibility and epigenetic stability. As such, the recombinant mammalian cells can provide predictable and stable transgene production.