Methods for recombinatorial nucleic acid synthesis
First Claim
1. A method for creating a plurality of nucleic acids comprising the steps of:
- (a) annealing a plurality of a defined first primer nucleic acid to a plurality of at least one first single stranded template nucleic acid,(b) performing a first extension by extending the first primer nucleic acid employing the first template nucleic acid in the presence of at least one dideoxynucleotide or a dideoxynucleotide comprising a nucleotide analog, wherein the dideoxynucleotide or dideoxynucleotide comprising a nucleotide analog is incorporated into the extended nucleic acid, to form a plurality of first extended nucleic acids having essentially identical 5′
ends and variable 3′
ends,(c) denaturing the first extended nucleic acids from the first template nucleic acid,(d) modifying or removing the dideoxynucleotide or dideoxynucleotide comprising a nucleotide analog from the first extended nucleic acids,e) annealing the first extended nucleic acids to a plurality of at least a second single stranded template nucleic acid whose sequence is not identical to the first template nucleic acid, andf) performing a second extension by extending the extended nucleic acid employing the second template nucleic acid to form a plurality of twice extended nucleic acids having essentially identical 5′
ends.
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Abstract
This invention pertains to a method for generating a pool of nucleic acid fragments useful for in vitro recombination and the creation of novel DNA sequences that encode desirable proteins or enzymes. The invention provides a defined mixture of nucleic acids and methods for use in the synthesis, mutagenesis, and recombination of nucleic acids. Nucleic acids may be synthesized by creating a nucleic acid extension ladder, annealing the extension ladder to template nucleic acids, and further extending the ladder of nucleic acids. The invention also relates to methods for performing repeated cycles of synthesis for the purpose of mutagenesis or recombination, methods for producing mutant peptides and proteins from the mutagenized or recombined nucleic acids, and methods for selecting a peptide, polypeptide or protein having altered biological activities.
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Citations
33 Claims
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1. A method for creating a plurality of nucleic acids comprising the steps of:
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(a) annealing a plurality of a defined first primer nucleic acid to a plurality of at least one first single stranded template nucleic acid, (b) performing a first extension by extending the first primer nucleic acid employing the first template nucleic acid in the presence of at least one dideoxynucleotide or a dideoxynucleotide comprising a nucleotide analog, wherein the dideoxynucleotide or dideoxynucleotide comprising a nucleotide analog is incorporated into the extended nucleic acid, to form a plurality of first extended nucleic acids having essentially identical 5′
ends and variable 3′
ends,(c) denaturing the first extended nucleic acids from the first template nucleic acid, (d) modifying or removing the dideoxynucleotide or dideoxynucleotide comprising a nucleotide analog from the first extended nucleic acids, e) annealing the first extended nucleic acids to a plurality of at least a second single stranded template nucleic acid whose sequence is not identical to the first template nucleic acid, and f) performing a second extension by extending the extended nucleic acid employing the second template nucleic acid to form a plurality of twice extended nucleic acids having essentially identical 5′
ends. - 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)
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Specification