Methods for genomic integration
Provided herein are methods of integrating one or more exogenous nucleic acids into one or more selected target sites of a host cell genome. in certain embodiments, the methods comprise contacting the host cell genome with one or more integration polynucleotides comprising an exogenous nucleic acid to be integrated into a genomic target site, a nuclease capable of causing a break at the genomic target site, and a linear nucleic acid capable of homologous recombination with itself or with one or more additional linear nucleic acids contacted with the population of cells, whereupon said homologous recombination results in formation of a circular extrachromosomal nucleic acid comprising a coding sequence for a selectable marker. in some embodiments, the methods further comprise selecting a host cell that expresses the selectable marker.
1. A composition comprising:
(a) a nucleic acid comprising a coding sequence for a site-specific nuclease; and
(b) a linear nucleic acid comprising two internal homology regions that upon introduction into a host cell are capable of homologously recombining with each other in the host cell, whereupon homologous recombination of the internal homology regions results in formation of a circular nucleic acid comprising a coding sequence for a selectable marker, and further wherein the linear nucleic acid is linear prior to introduction into the host cell.
2. A host cell comprising the composition of claim 1 .
3. A cell culture composition comprising a cell culture medium and the host cell of claim 2 .
4. The cell culture composition of claim 3 , further comprising a compound that selects for expression of the selectable marker.