Compositions and methods for genomic integration of nucleic acids into exogenous landing pads

1. A method for integrating one or more exogenous donor nucleic acids into a host cell's genome, the method comprising:

either (a2) or (a3):

(a2) contacting a host cell, the host cell comprising one or more exogenous landing pads integrated in the host cell's genome, wherein each exogenous landing pad comprises a nuclease target sequence (NTS) positioned between an upstream landing pad homology sequence (ULP) and a downstream landing pad homology sequence (DLP), with:

(i) one or more first component polynucleotides, wherein each first component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) an upstream library sequence (UL) capable of homologously recombining with any (ULP) of any of the one or more exogenous landing pads;

(2) a first nucleic acid of interest, and

(3) a first linker sequence;

(ii) one or more last component polynucleotides, wherein each last component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) a last linker sequence;

(2) a last nucleic acid of interest; and

(3) a downstream library sequence (DL) capable of homologously recombining at any (DLP) of any of the one or more exogenous landing pads,

wherein any first linker sequence of the one or more first component polynucleotides is capable of homologously recombining with any last linker sequence of the one or more last component polynucleotides; or

(a3) contacting a host cell, the host cell comprising one or more exogenous landing pads integrated in the host cell's genome, wherein each exogenous landing pad comprises a nuclease target sequence (NTS) positioned between an upstream landing pad homology sequence (ULP) and a downstream landing pad homology sequence (DLP), with:

(i) one or more first component polynucleotides, wherein each first component polynucleotide comprises, in a 5′ to 3′ orientation, an upstream library sequence (UL) capable of homologously recombining with any (ULP) of the one or more exogenous landing pads, a nucleic acid of interest, and a linker sequence;

(ii) one or more intermediate component polynucleotides, wherein each intermediate component polynucleotide comprises, in a 5′ to 3′ orientation, a first linker sequence, a nucleic acid of interest, and a second linker sequence; and

iii. one or more last component polynucleotides, wherein each last component polynucleotide comprises, in a 5′ to 3′ orientation, a linker sequence, a nucleic acid of interest, and a downstream library sequence (DL) capable of homologously recombining with any (DLP) of the one or more exogenous landing pad(s),

wherein each linker sequence is capable of homologously recombining with another linker sequence; and

(b) one or more nuclease (N) capable of binding to (NTS) and cleaving a site within the one or more exogenous landing pads; and

(c) recovering a host cell generated from the contacted host cell;

wherein, for (a2), any combination of the one or more first component polynucleotides and the one or more last component polynucleotides, which are homologously recombined in vivo via their linker sequences, is integrated at any of the one or more exogenous landing pads, independent of genomic sequences surrounding each landing pad;

wherein, for (a3), any combination of the one or more first component polynucleotides, the one or more intermediate component polynucleotides, and the one or more last component polynucleotides, which are homologously recombined in vivo via their linker sequences, is integrated at any of the one or more exogenous landing pads, independent of genomic sequences surrounding each landing pad.

2. The method of claim of 1 , wherein, for (a2), each of the one or more first component polynucleotides comprises a promoter and each of the one or more last component polynucleotides comprises a gene of interest.

3. The method of claim 1 , wherein each of (ULP) and (DLP) comprises between 20 nucleotides and 5,000 nucleotides in length, between 25 nucleotides and 1000 nucleotides in length, between 25 nucleotides and 500 nucleotides in length, or between 100 nucleotides and 500 nucleotides in length.

4. The method of claim 1 , wherein each of (ULP) and (DLP) comprises less than 100 base pairs of homology with each of (UL) and (DL), respectively.

5. The method of claim 1 , wherein each of (ULP) and (DLP) comprises between 100 and 200 base pairs of homology with each of (UL) and (DL), respectively.

6. The method of claim 1 , wherein each (ULP) and (DLP) comprises between 200 and 500 base pairs of homology with each of (UL) and (DL), respectively.

7. The method of claim 1 , wherein at least a portion of each of (UL) and (DL) is homologous to (ULP) and (DLP), respectively, for host cell-mediated homologous recombination.

8. The method of claim 1 , wherein the host cell comprises 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 exogenous landing pads.

9. The method of claim 1 , wherein the one or more exogenous landing pads are integrated at selected neutral loci in the host cell's genome.

10. The method of claim 1 , wherein the one or more exogenous landing pads are integrated at intergenic regions in the host cell's genome.

11. The method of claim 1 , wherein the host cell comprises two or more exogenous landing pads, wherein each (UL) is capable of homologously recombining at any (ULP), and each (DL) is capable of homologously recombining at any (DLP), of any of the exogenous landing pads.

12. The method of claim 1 , wherein the host cell further comprises at least one secondary landing pad integrated in the host cell's genome, the secondary landing pad comprising a secondary nuclease target sequence positioned between a secondary upstream landing pad homology sequence and a secondary downstream landing homology pad sequence, wherein:

(a) the secondary upstream landing pad sequence is different from (ULP) of the one or more exogenous landing pads;

(b) the secondary downstream landing pad sequence is different from (DLP) of the one or more exogenous landing pads;

(c) the secondary nuclease target sequence is different from the (NTS) of the one or more exogenous landing pads; or

(d) any combination thereof.

13. A method for targeted integration of exogenous donor nucleic acids into the host cell's genome, the method comprising:

(a) contacting a host cell, the host cell comprising one or more exogenous landing pads integrated in the host cell's genome, wherein each exogenous landing pad comprises a nuclease target sequence (NTS) positioned between an upstream landing pad homology sequence (ULP) and a downstream landing pad homology sequence (DLP), wherein each landing pad is nested within an upper endogenous genomic sequence (UEG) and a downstream endogenous genomic sequence (DEG), with:

i. a nuclease capable of cleaving (NTS) in the one or more exogenous landing pads; and

ii. one or more first component polynucleotides, wherein each first component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) an upstream library sequence (UL) capable of homologously recombining with any (ULP) of any of the one or more exogenous landing pads;

(2) a first nucleic acid of interest;

(3) a first linker sequence; and

iii. one or more last component polynucleotides, wherein each last component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) a last linker sequence;

(2) a last nucleic acid of interest; and

(3) a downstream library sequence (DL) capable of homologously recombining with (DEG) of the one or more exogenous landing pads,

(b) recovering a host cell generated from the contacted host cell,

wherein any combination of a first component polynucleotide from the one or more first component polynucleotides and a last component polynucleotide from the one or more last component polynucleotides, which are homologously recombined in vivo via their linker sequences, is integrated at an exogenous landing pad with (DEG).

14. A method for targeted integration of exogenous donor nucleic acids into the host cell's genome, the method comprising:

(a) contacting a host cell, the host cell comprising one or more exogenous landing pads integrated in the host cell's genome, wherein each exogenous landing pad comprises a nuclease target sequence (NTS) positioned between an upstream landing pad homology sequence (ULP) and a downstream landing pad homology sequence (DLP), wherein each landing pad is nested within an upper endogenous genomic sequence (UEG) and a downstream endogenous genomic sequence (DEG), with:

i. a nuclease capable of cleaving (NTS) in the one or more exogenous landing pads; and

ii. one or more first component polynucleotides, wherein each first component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) an upstream library sequence (UL) capable of homologously recombining with (UEG) of the one or more exogenous landing pads;

(2) a first nucleic acid of interest;

(3) a first linker sequence; and

iii. one or more last component polynucleotides, wherein each last component polynucleotide comprises, in a 5′ to 3′ orientation:

(1) a last linker sequence;

(2) a last nucleic acid of interest; and

(3) a downstream library sequence (DL) capable of homologously recombining with any DLP of any of the one or more exogenous landing pads,

(b) recovering a host cell generated from the contacted host cell,

wherein any combination of a first component polynucleotide from the one or more first component polynucleotides and a last component polynucleotide from the one or more last component polynucleotides, which are homologously recombined in vivo via their linker sequences, is integrated at an exogenous landing pad with (UEG).