Methods for generating polynucleotides having desired characteristics by iterative selection and recombination
First Claim
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1. A method for obtaining a chimeric polynucleotide comprising:
- a) treating a sample comprising different double-stranded template polynucleotides wherein said different template polynucleotides contain areas of identity and areas of heterology under conditions which provide for the cleavage of said double stranded template polynucleotides into random double-stranded template fragments of a desired size;
b) denaturing the resultant random double-stranded template fragments contained in the treated sample produced by step (a) into single-stranded fragments;
c) incubating the resultant single-stranded fragments with polymerase under conditions which provide for the annealing of the target single-stranded fragments at the areas of identity and the formation of chimeric double-stranded polynucleotide sequences comprising template polynucleotide sequences; and
d) repeating steps (b) and (c) at least twice;
e) selecting or screening the chimeric double stranded polynucleotide sequences to identify a chimeric double stranded polynucleotide sequence having a desired functional 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.
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Citations
62 Claims
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1. A method for obtaining a chimeric polynucleotide comprising:
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a) treating a sample comprising different double-stranded template polynucleotides wherein said different template polynucleotides contain areas of identity and areas of heterology under conditions which provide for the cleavage of said double stranded template polynucleotides into random double-stranded template fragments of a desired size;
b) denaturing the resultant random double-stranded template fragments contained in the treated sample produced by step (a) into single-stranded fragments;
c) incubating the resultant single-stranded fragments with polymerase under conditions which provide for the annealing of the target single-stranded fragments at the areas of identity and the formation of chimeric double-stranded polynucleotide sequences comprising template polynucleotide sequences; and
d) repeating steps (b) and (c) at least twice;
e) selecting or screening the chimeric double stranded polynucleotide sequences to identify a chimeric double stranded polynucleotide sequence having a desired functional 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, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting, the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the cycles of denaturation are performed at 80-100°
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53. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the annealing is performed at 40-65°
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54. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the annealing is performed in the presence of PEG.
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55. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the annealing is performed at a salt concentration of 10-100 nM.
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56. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the extension is performed using taq polymerase.
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57. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the extension is performed using Klenow.
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58. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the shuffled polynucleotides have a length of 500-50 kb.
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59. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein the shuffled polynucleotides comprises concatemers.
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60. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein sequences from at least eight polynucleotide variants are present.
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61. A method of shuffling polynucleotides, comprising:
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conducting multiple cycles of denaturation, annealing and extenion on partially annealed polynucleotide strands having sequences from a plurality of polynucleotide variants under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property;
wherein sequence are from polynucleotide variants of unknown sequence.
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62. A method of shuffling polynucleotides, comprising:
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randomly cleaving a mixed population of polynucleotide vanants to produce fragments;
conducting multiple cycles of denaturation, annealing and extension on the fragments under conditions whereby one strand of a fragment serves as a template for extension of a strand from another fragment to generate a population of shuffled polynucleotides; and
screening or selecting the shuffled polynucleotides to identify a shuffled polynucleotide having a desired functional property.
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Specification