Methods for generating polynucleotides having desired characteristics by iterative selection and recombination
First Claim
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1. A method for producing a polynucleotide having a desired functional property, said method comprising:
- (a) providing a population of homologous polynucleotides, wherein at least two of the related polynucleotides differ from each other by the presence of at least one deletion or insertion;
(b) shuffling the homologous polynucleotides to produce a plurality of recombinant polynucleotides, and selecting or screening the population of recombinant polynucleotides to obtain at least one recombinant polynucleotide that has evolved toward the desired functional property; and
, (c) shuffling the recombinant polynucleotide(s) produced in the previous step, and selecting or screening for at least one recombinant polynucleotide that has evolved toward the 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
69 Claims
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1. A method for producing a polynucleotide having a desired functional property, said method comprising:
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(a) providing a population of homologous polynucleotides, wherein at least two of the related polynucleotides differ from each other by the presence of at least one deletion or insertion;
(b) shuffling the homologous polynucleotides to produce a plurality of recombinant polynucleotides, and selecting or screening the population of recombinant polynucleotides to obtain at least one recombinant polynucleotide that has evolved toward the desired functional property; and
,(c) shuffling the recombinant polynucleotide(s) produced in the previous step, and selecting or screening for at least one recombinant polynucleotide that has evolved toward the desired functional property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 28, 29, 39, 40, 41, 42, 43, 44, 45, 46, 55, 67)
a) treating the related or recombinant polynucleotides under conditions which provide for the cleavage of said polynucleotides into random double-stranded fragments of a desired size;
b) denaturing the double-stranded fragments into single-stranded fragments, whereby a mixture of overlapping single-stranded fragments is produced; and
,c) incubating the resultant population of single-stranded fragments with a polymerase under conditions which result in the annealing of the single-stranded fragments at areas of similarity to form pairs of annealed fragments, said areas of similarity being sufficient for one member of a pair to prime replication of the other thereby forming recombinant polynucleotides.
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12. The method of claim 11, wherein at least one cycle of shuffling comprises:
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a) treating the related or recombinant polynucleotides under conditions which provide for the cleavage of said polynucleotides into random double-stranded fragments of a desired size;
b) combining the product of step (a) and one or more single or double-stranded oligonucleotides, wherein said oligonucleotides comprise an area of similarity and an area of heterology to the related or recombinant double-stranded polynucleotides;
c) denaturing the resultant mixture of double-stranded overlapping fragments and oligonucleotides into single-stranded fragments; and
,c) incubating the resultant population of single-stranded fragments with a polymerase under conditions which result in the annealing of the single-stranded fragments at areas of identity similarity to form pairs of annealed fragments, said areas of similarity being sufficient for one member of a pair to prime replication of the other thereby forming recombinant polynucleotides.
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28. The method of claim 1 wherein said population of homologous polynucleotides comprises allelic or species variants, and wherein said deletion or insertion is naturally occurring.
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29. The method of claim 1 wherein at least one cycle of shuffling comprises conducting a multi-cyclic polynucleotide extension process on partially annealed polynucleotide strands comprising sequences from the plurality of homologous polynucleotides, the polynucleotide strands having regions of similarity and regions of heterology with each other and being partially annealed through the regions of similarity, under conditions whereby one strand serves as a template for extension of another strand with which it is partially annealed to generate the recombinant polynucleotides.
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39. The method of any one of claims 1, 13, 14, 29, 30 and 38 wherein said recombinant polynucleotides encode for recombinant polypeptides and wherein said selecting or screening step comprises:
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(a) introducing said population of recombinant polynucleotides into a population of cells (b) expressing said recombinant polynucleotides in said population of cells; and
(c) selecting or screening said population of cells for the desired functional property.
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40. The method of any one of claims 1, 13, 14, 29, 30 and 38 wherein said recombinant polynucleotides encode for recombinant polypeptides and wherein said selecting or screening step comprises:
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(a) expressing said recombinant polynucleotides in vitro to produce said population of recombinant polypeptides; and
(b) selecting or screening said population of recombinant polypeptides for the desired functional property.
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41. The method of any one of claims 1, 13, 14, 29, 30 and 38, wherein the recombinant polynucleotide with the desired functional property encodes an enzyme.
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42. The method of any one of claims 1, 13, 14, 29, 30 and 38, wherein the recombinant polynucleotide with the desired functional property encodes a viral coat protein.
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43. The method of any one of claims 1, 13, 14, 29, 30 and 38, wherein the recombinant polynucleotide with the desired functional property encodes an antibody chain.
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44. The method of any one of claims 1, 13, 14, 29, 30 and 38, wherein the recombinant polynucleotide with the desired functional property encodes a polymerase.
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45. The method of any one of claims 1, 13, 14, 29, 30 and 38, further comprising expressing the recombinant polynucleotide with the desired functional property to produce an expression product thereof.
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46. The method of claim 1, wherein at last one shuffling step comprises generating partial length copies of the homologous polynucleotides under conditions in which at least 20% of products are partial length products, whereby the partial length products anneal in new pairings and one member of a pair primes replication of the other, thereby forming the recombinant polynucleotides.
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55. The method of claim 29 wherein the partially annealed polynucleotide strands are produced by providing overlapping single-stranded segments of the plurality of homologous polynucleotides and incubating under annealing conditions whereby the single-stranded segments from the different homologous polynucleotides anneal to form the partially annealed polynucleotide strands.
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67. The method of claim 29 wherein said plurality of homologous polynucleotides are species variants.
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13. A method for producing a polynueleotide having a desired property, said method comprising:
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conducting a multi-cycle polynucleotide extension process on overlapping segments having sequences of a population of related polynucleotides under conditions whereby one segment serves as a template for extension of another segment, to generate a population of recombinant polynucleotides, wherein said related polynucleotides differ from each other by the presence of deletions or insertions; and
screening or selecting recombinant polynucleotides or expression products thereof to identify at least one recombinant polynucleotide having a desired functional property. - View Dependent Claims (48, 65)
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14. A method for producing a polynucleotide having a desired property, said method comprising:
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(a) choosing a plurality of polynucleotide variants to be shuffled, wherein at least one polynucleotide variant has been mutagenized;
(b) conducting a multi-cyclic polynucleotide extension process on partially annealed polynucleotide strands comprising sequences from the plurality of polynucleotide variants, the polynucleotide strands having regions of similarity and regions of heterology with each other and being partially annealed through the regions of similarity, 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 recombinant polynucleotides; and
(c) selecting and screening recombinant polynucleotides to identify at least one polynucleotide having a desired functional property. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 61, 62, 63, 64, 66, 69)
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30. A method of producing a polynucleotide having a desired functional property comprising:
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(a) providing a plurality of polynucleotides comprising exon sequences separated by an intron sequence, at least one of which polynucleotide is in cell-free form;
(b) shuffling the population of polynucleotides to produce recombinant polynucleotides;
(c) selecting or screening for recombinant polynucleotides that have evolved toward the desired property;
(d) repeating steps
2) and
3) with the recombinant polynucleotides selected in step
3) until a recombinant polynucleotide has acquired the desired functional property.- View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 47, 60, 68)
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Specification