Methods for generating polynucleotides having desired characteristics by iterative selection and recombination
First Claim
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1. A method for evolving a polynucleotide for acquisition of a desired functional property, comprising:
- (1) providing a library of variant forms of a polynucleotide, some of which are components of a vector, and some of which are not components of a vector, (2) introducing the library of variant forms into a population of cells, (3) propagating the cells under conditions whereby recombination occurs between the variant forms that are components of a vector and the variant forms that are not components of a vector to generate recombinant forms of the polynucleotide;
(4) selecting or screening the recombinant forms of the polynucleotide to identify at least one recombinant form of the polynucleotide having evolved toward a desired property.
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Abstract
A method for DNA reassembly after random fragmentation, and its application to mutagenesis of nucleic acid sequences by in vitro or in vivo recombination is described. In particular, a method for the production of nucleic acid fragments or polynucleotides encoding mutant proteins is described. The present invention also relates to a method of repeated cycles of mutagenesis, shuffling and selection which allow for the directed molecular evolution in vitro or in vivo of proteins.
287 Citations
94 Claims
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1. A method for evolving a polynucleotide for acquisition of a desired functional property, comprising:
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(1) providing a library of variant forms of a polynucleotide, some of which are components of a vector, and some of which are not components of a vector, (2) introducing the library of variant forms into a population of cells, (3) propagating the cells under conditions whereby recombination occurs between the variant forms that are components of a vector and the variant forms that are not components of a vector to generate recombinant forms of the polynucleotide;
(4) selecting or screening the recombinant forms of the polynucleotide to identify at least one recombinant form of the polynucleotide having evolved toward a desired property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for evolving a polynucleotide for acquisition of a desired functional property, comprising:
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(1) providing a mixed population of variant forms of a polynucleotide, each form incorporated in a separate copy of the same vector;
(2) introducing the mixed population of variant forms into a population of cells, whereby some cells receive from the mixed population at least two different variant forms of the polynucleotide incorporated on separate copies of the vector, which recombine with each other, thereby forming a library of recombinant forms of the polynucleotide incorporated in separate copies of the vector;
(3) selecting or screening the recombinant forms of the polynucleotides to identify at least one recombinant form of the polynucleotide having evolved toward the desired functional property. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for evolving a polynucleotide for acquisition of a desired functional property, comprising:
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(1) providing variant forms of a polynucleotide, each form incorporated in a vector;
(2) introducing the variant forms into a population of cells, whereby some cells receive at least two different variant forms of the polynucleotide, whereby the different variant forms of the polynucleotides recombine to form a library of recombinant forms of the polynucleotide incorporated in the vector;
(3) selecting or screening for recombinant forms of the polynucleotides having evolved toward the desired functional property;
(4) repeating (2) and (3) with further variant forms of the polynucleotide comprising a subset of the recombinant forms having evolved toward the desired functional property, until a recombinant form of a polynucleotide has acquired the desired functional property. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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73. A method of evolving a polynucleotide sequence toward a desired functional property, comprising:
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(1) recombining variant forms of a polynucleotide sequence in a host cell, at least some of which forms are provided in cell-free form before introduction into the host cell;
(2) selecting or screening for recombinant forms of the polynucleotide sequence that have evolved toward the desired functional property;
(3) recombining selected or screened recombinant forms having evolved toward the desired functional property with each other to generate further recombinant forms;
(4) selecting or screening for further recombinant forms of the polynucleotide sequence that have evolved toward the desired functional property. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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Specification