Recently developed DNA assembly methods have enabled the rapid and simultaneous assembly of multiple parts to create complex synthetic gene circuits. A number of groups have proposed the use of computationally designed orthogonal spacer sequences to guide the ordered assembly of parts using overlap-directed or homologous recombination-based methods. This approach is particularly useful for assembling multiple parts with repetitive elements. Orthogonal spacer sequences (sometimes called UNSs-unique nucleotide sequences) also have a number of other potential uses including in the design of synthetic promoters regulated by novel regulatory elements.
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