| CPC C12N 15/11 (2013.01) [C12N 2310/20 (2017.05); C12N 2330/51 (2013.01)] | 10 Claims |
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1. A method for generating a covalently closed circularized (ccc) DNA vector for expressing a fixed pair of guide RNAs (gRNAs) comprising the steps of:
(a) Providing an enhanced recipient vector comprising:
(x) two inverted or extraverted enhanced gRNA expression cassettes, wherein each enhanced gRNA expression cassette comprises in that order: (i) optionally an RNA promoter, (ii) a gRNA placeholder sequence, and (iii) optionally a crRNA sequence; and
(y) a tracrRNA expression cassette;
(b) Providing an enhanced mutagenic DNA primer comprising two gRNA coding sequences of interest and homology regions capable to mediate a binding of the mutagenic DNA primer to the two inverted or extraverted enhanced gRNA expression cassettes; and
(c) Generating a cccDNA vector using the recipient vector and the mutagenic DNA primer.
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