The DNA could be either PCR generated or a product of RE digestion. Also, if there is any particular minimum limit to the length of the target DNA to be self-ligated?
the attached paper may be useful using circligase to generate circular dna from linear which could then be use for inverse pcr or amplification using rolling circle amplification
the attached paper may be useful using circligase to generate circular dna from linear which could then be use for inverse pcr or amplification using rolling circle amplification