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Methods and compositions for cellular and metabolic engineering

  • US 6,391,640 B1
  • Filed: 11/09/1998
  • Issued: 05/21/2002
  • Est. Priority Date: 02/17/1994
  • Status: Expired due to Term
First Claim
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1. A method of shuffling polynucleotides, the method comprising:

  • (i) providing a plurality of polynucleotide variants to be shuffled;

    (ii) conducting a multi-cyclic polynucleotide extension process on at least partially annealed polynucleotide strands having sequences from the plurality of polynucleotide variants, the polynucleotide strands having regions of similarity and regions of heterology with each other, and being at least 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

    , (iii) selecting or screening a recombinant polynucleotide from the population of recombinant polynucleotides for a desired property, thereby producing an optimized recombinant polynucleotide having the desired property;

    wherein the desired property comprises;

    an elevated expression of the recombinant polynucleotide in a first cell relative to an expression level of one or more of the plurality of polynucleotide variants to be shuffled in the first cell.

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