Recombination of polynucleotide sequences using random or defined primers
First Claim
1. A method of recombining polynucleotides to produce recombinant polynucleotides, comprising:
- (a) providing a population of different template polynucleotides having different sequences and a pair of first and second primers respectively disposed to hybridize to at least one strand of the template polynucleotides and its complement;
(b) conducting a multi-cyclic polynucleotide extension reaction on the template polynucleotides primed from the first primer and not the second primer under conditions of incomplete extension, whereby incomplete extension product primed from the first primer anneals to different members of the population of template polynucleotides having different sequences in different extension cycles and undergoes further extension thereby generating recombinant incomplete extension products and subsequently full-length recombinant extension products;
(c) contacting the full-length recombinant extension products with the second primer and extending the second primer to form double stranded full-length recombinant extension products.
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Abstract
A method for in vitro mutagenesis and recombination of polynucleotide sequences based on polymerase-catalyzed extension of primer oligonucleotides is disclosed. The method involves priming template polynucleotide(s) with random-sequences or defined-sequence primers to generate a pool of short DNA fragments with a low level of point mutations. The DNA fragments are subjected to denaturization followed by annealing and further enzyme-catalyzed DNA polymerization. This procedure is repeated a sufficient number of times to produce full-length genes which comprise mutants of the original template polynucleotides. These genes can be further amplified by the polymerase chain reaction and cloned into a vector for expression of the encoded proteins.
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Citations
41 Claims
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1. A method of recombining polynucleotides to produce recombinant polynucleotides, comprising:
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(a) providing a population of different template polynucleotides having different sequences and a pair of first and second primers respectively disposed to hybridize to at least one strand of the template polynucleotides and its complement;
(b) conducting a multi-cyclic polynucleotide extension reaction on the template polynucleotides primed from the first primer and not the second primer under conditions of incomplete extension, whereby incomplete extension product primed from the first primer anneals to different members of the population of template polynucleotides having different sequences in different extension cycles and undergoes further extension thereby generating recombinant incomplete extension products and subsequently full-length recombinant extension products;
(c) contacting the full-length recombinant extension products with the second primer and extending the second primer to form double stranded full-length recombinant extension products. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of recombining polynucleotides to produce recombinant polynucleotides, comprising:
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(a) providing a population of different template polynucleotides having different sequences and a pair of first and second primers respectively disposed to hybridize to at least one of the template polynucleotides and its complement;
(b) annealing the first primer to the at least one template polynucleotide;
(c) conducting a template dependent extension of the first primer under conditions of incomplete extension to form an incomplete extension product annealed to the at least one template;
(d) denaturing the incomplete extension product and the at least one template;
(e) annealing the incomplete extension product to at least a second template;
(f) conducting template dependent extension of the incomplete extension product to form a further incomplete or a full-length extension product, which extension product contains sequences extended from a plurality of the different templates having different sequences;
(g) denaturing the extension product of (f) and the template to which it is annealed;
(h) performing further cycles of (e-g) if needed to produce a full-length extension product;
(i) annealing the second primer to the full-length extension product of step (h), and extending the second primer to form a double stranded full-length extension product, the extension product being a recombined form of the template polynucleotides.
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16. A method of recombining polynucleotides having different sequences, comprising:
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performing in vitro recombination of first strands of a population of template polynucleotides having different sequences without recombining second strands complementary to the first strands;
synthesizing complementary strands to the recombined first strands to form recombined duplex polynucleotides. - View Dependent Claims (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)
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Specification