Claims
- 1. A method of making a DNA comprising a recombinant eukaryotic viral amplicon, the method comprising:
(a) transducing a bacterial cell with a first DNA, wherein the first DNA comprises a DNA vector comprising (i) a portion of eukaryotic viral genome comprising an ITR, (ii) a regulatable anti-selection gene, (iii) a phage packaging site, and (iv) a deficient or conditionally-deficient lambdoid origin of replication, and a second DNA, which comprises a DNA segment with high homology to a DNA segment of the first DNA, and (b) transducing the bacterial cell with a defective phage or a non-defective phage, or activating a defective or non-defective lysogen within the cell, such that the deficient or conditionally deficient lambdoid origin of replication is operable and the first DNA and the second DNA undergo a double homologous recombination event to form a DNA comprising a recombinant eukaryotic viral amplicon.
- 2. The method of claim 1, wherein the defective lysogen, non-defective lysogen, defective phage, or non-defective phage is lambda clear.
- 3. The method of claim 1, wherein the defective lysogen, non-defective lysogen, defective phage, or non-defective phage has a genome and a phage packaging site, wherein the phage packaging site of the defective lysogen, non-defective lysogen, defective phage, or non-defective phage is missing or can be rendered non-functional without isolating the genome of the defective lysogen, non-defective lysogen, defective phage, or non-defective phage.
- 4. The method of claim 3, wherein the phage packaging sequence is flanked by parallel site-directed homologous recombination sites and wherein the bacterial cell expresses a site-directed homologous recombinase.
- 5. The method of claim 4, wherein the site-directed homologous recombination sites are lox sites and the site-directed homologous recombinase is cre.
- 6. A method of making a desired vector comprising a desired eukaryotic viral amplicon, the method comprising:
(i) transforming a first bacterial cell under conditions that are permissive of homologous recombination with a first DNA, which comprises (a) a phage packaging site, (b) a conditionally inoperative lambdoid origin of replication, (c) an independent positive selection gene, and (d) a eukaryotic viral DNA with an anti-selective gene embedded in the eukaryotic viral DNA, and a second DNA, which comprises two DNA sequences with high homology to the first DNA flanking a DNA sequence of interest, wherein (d) does not comprise (a), (ii) expressing in the first bacterial cell a source of phage gene functions sufficient to provide for the operation of the conditionally deficient lambdoid origin of replication and sufficient to encapsidate vectors comprising a suitable length of DNA and the phage packaging site, wherein the source is an activated lysogen or a superinfected phage, to obtain a mixed population of encapsidated vectors, the mixed population comprising a desired lambdid vector that comprises a desired eukaryotic viral amplicon, (iii) obtaining a phage-like lysate of the mixed population of encapsidated vectors, (iv) transducing a second bacterial cell with the phage-like lysate, and (v) maintaining the second bacteria cell under conditions selective for the first independent positive selection gene and anti-selective for the superinfected phage and the anti-selective gene, to isolate a colony comprising a desired vector comprising a desired eukaryotic viral amplicon.
- 7. A recombination-deficient bacterial cell comprising a nucleotide sequence encoding T7 polymerase integrated into the bacterial genome.
- 8. The recombination-deficient bacterial cell of claim 7, wherein said recombination-deficient bacterial cell comprises a lambda lysogen.
- 9. The recombination-deficient bacterial cell of claim 7, wherein the recombination-deficient bacterial cell is recA−.
- 10. The recombination-deficient bacterial cell of claim 9, wherein the recombination-deficient bacterial cell is DH5α.
- 11. The recombination-deficient bacterial cell of claim 10, wherein T7 polymerase is constitutively expressed.
- 12. The recombination-deficient bacterial cell of claim 10, wherein T7 polymerase is inducibly expressed.
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
[0001] This patent application is a divisional of copending U.S. patent application Ser. No. 09/450,972, filed Nov. 30, 1999, which is a continuation of International Application No. PCT/US98/12158, filed Jun. 9, 1998, which designates the United States and which claims the benefit of U.S. Provisional Patent Application No. 60/072,222, filed Jan. 22, 1998, and U.S. Provisional Patent Application No. 60/049,072, filed Jun. 9, 1997.
Provisional Applications (2)
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Number |
Date |
Country |
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60072222 |
Jan 1998 |
US |
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60049072 |
Jun 1997 |
US |
Divisions (1)
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Number |
Date |
Country |
Parent |
09450972 |
Nov 1999 |
US |
Child |
10162043 |
Jun 2002 |
US |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/US98/12158 |
Jun 1998 |
US |
Child |
09450972 |
Nov 1999 |
US |