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Synthetic biologists rely on semi-synthetic recombinant plasmids, but DNA synthesis is constrained by practical limits on length, accuracy, and sequence composition. Cloned DNA parts can be assembled into longer constructs via subcloning, but conventional methods are labor-intensive. One-pot recombination reactions are more convenient but harder to troubleshoot, and those that depend on PCR to create fragments with compatible ends necessitate re-sequencing. The Tip Snip protocol described here enables the subcloning of an insert from one plasmid polylinker into another without PCR or gel purification steps. Cohesive ends of unwanted restriction fragments are snipped off by additional restriction endonucleases. The resulting short fragments (snippets) are eliminated by hybridization to complementary oligonucleotides (anti-snippets) and subsequent size-selection spin-column chromatography. Unwanted linear donor vectors are ligated to double-stranded oligonucleotides (unlinkers) so that only the desired insert and recipient plasmid form circular DNA capable of transforming bacteria. This new method is compatible with high-throughput processing and automated liquid handling, and because no specialized vectors, reagents, selection schemes, or analytical techniques are required, the barriers to adoption are low.

Semi-automated Tip Snip cloning of restriction fragments into and out of plasmid polylinkers