DNA mutagenesis by random fragmentation and reassembly
First Claim
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1. A method for forming a mutagenized double-stranded polynucleotide from a template double-stranded polynucleotide, comprising:
- a) providing a population of double-stranded overlapping fragments of the template double-stranded polynucleotide and one or more single or double-stranded oligonucleotides, wherein said oligonucleotides comprise an area of identity and an area of heterology to the template double-stranded polynucleotide;
b) denaturing the resultant mixture of double-stranded overlapping fragments and oligonucleotides into single-stranded fragments;
c) incubating the resultant population of single-stranded fragments with a polymerase under conditions which result in the annealing of said single-stranded fragments at said areas of identity to form pairs of annealed fragments, said areas of identity being sufficient for one member of a pair to prime replication of the other thereby forming mutagenized double-stranded polynucleotides; and
d) repeating steps (b) and (c) for at least two further cycles, wherein the resultant mixture in step (b) of a further cycle includes the mutagenized double-stranded polynucleotides from step (c) of the previous cycle, and the further cycle forms further mutagenized double-stranded polynucleotides whereby the average length of the mutagenized polynucleotides increases in each cycle.
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Abstract
A method for generating libraries of displayed peptides and/or antibodies (Abs) suitable for affinity interaction screening or phenotypic screening comprising: (i) obtaining selected library members comprising a displayed peptide and/or Ab and the corressponding polynucleotide (PN), or copies of it, (ii) pooling and fragmenting the PN, or copies of it, to form fragments, (iii) performing PCR amplification and thereby homologously recombining the fragments to form a shuffled pool of recombined PNs, which are not present in the selected library of (i).
1060 Citations
28 Claims
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1. A method for forming a mutagenized double-stranded polynucleotide from a template double-stranded polynucleotide, comprising:
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a) providing a population of double-stranded overlapping fragments of the template double-stranded polynucleotide and one or more single or double-stranded oligonucleotides, wherein said oligonucleotides comprise an area of identity and an area of heterology to the template double-stranded polynucleotide; b) denaturing the resultant mixture of double-stranded overlapping fragments and oligonucleotides into single-stranded fragments; c) incubating the resultant population of single-stranded fragments with a polymerase under conditions which result in the annealing of said single-stranded fragments at said areas of identity to form pairs of annealed fragments, said areas of identity being sufficient for one member of a pair to prime replication of the other thereby forming mutagenized double-stranded polynucleotides; and d) repeating steps (b) and (c) for at least two further cycles, wherein the resultant mixture in step (b) of a further cycle includes the mutagenized double-stranded polynucleotides from step (c) of the previous cycle, and the further cycle forms further mutagenized double-stranded polynucleotides whereby the average length of the mutagenized polynucleotides increases in each cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 28)
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8. A method for obtaining a chimeric polynucleotide sequence 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 whereby overlapping double-stranded fragments of a desired size of said different double-stranded template polynucleotides are formed; b) denaturing the resultant overlapping double-stranded fragments of said different double-stranded template polynucleotides 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 single-stranded fragments at the areas of identity to form pairs of annealed fragments, said areas of identity being sufficient for one member of a pair to primer replication of the other thereby forming chimeric double-stranded polynucleotide sequences comprising template polynucleotide sequences; and d) repeating steps (b) and (c) for at least two cycles, wherein the resultant mixture in step (b) of a cycle includes the chimeric double-stranded polynucleotide sequences in step (c), and the further cycle forms a further chimeric polynucleotide sequences whereby and the average length of chimeric polynucleotide sequences increases in each cycle. - View Dependent Claims (9, 10, 11, 12)
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13. A method for generating libraries of displayed peptides or displayed antibodies suitable for affinity interaction screening or phenotypic screening, the method comprising:
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(1) obtaining a first plurality of selected library members comprising a displayed peptide or displayed antibody and an associated polynucleotide encoding said displayed peptide or displayed antibody, and obtaining said associated polynucleotides or copies thereof wherein said associated polynucleotides comprise a region of substantially identical sequence, and (2) pooling and fragmenting said associated polynucleotides or copies to form a population of double-stranded fragments thereof 3) denaturing the population of double-stranded fragments into single-stranded fragments; c) incubating the resultant population of single-stranded fragments with a polymerase under conditions which result in the annealing of said single-stranded fragments at areas of overlap to form pairs of annealed fragments, whereby one member of a pair primes replication of the other thereby forming recombinant polynucleotides; d) repeating steps b) and c) for at least two further cycles wherein the resultant mixture in step (b) of a further cycle includes the recombinant polynucleotides from step c) of the previous cycle, whereby the average length of polynucleotides increases in each cycle to form a shuffled pool of recombined polynucleotides, whereby a substantial fraction of the recombined polynucleotides of said shuffled pool are not present in the associated polynucleotides in step (1) and the shuffled pool of recombined polynucleotides encodes the libraries of displayed peptides or displayed antibodies suitable for affinity interaction screening or phenotypic screening. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 25, 26, 27)
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22. A method for generating libraries of displayed peptides or displayed antibodies suitable for affinity interaction screening or phenotypic screening, the method comprising:
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(1) obtaining a first plurality of selected library members comprising a displayed peptide or displayed antibody and an associated polynucleotide encoding said displayed peptide or displayed antibody, and obtaining said associated polynucleotides or copies thereof wherein said associated polynucleotides comprise a region of substantially identical sequence, and (2) cloning or amplifying said associated polynucleotides or copies on episomally replicable vectors and transferring a multiplicity of said vectors into a cell and homologously recombining to form shuffled library members in vivo encoding the libraries of displayed peptide or displayed antibodies suitable for affinity interaction screening or phenotypic screening. - View Dependent Claims (23, 24)
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Specification