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Publication
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Rolling circle amplification (RCA) is a widely used DNA amplification method that uses circular template DNA as input and produces multimeric, linear single- or double-stranded DNA. Circle-to-circle amplification (C2CA) has further expanded this method by implementing product recircularization using restriction and ligation, leading to a higher amplification yield and enabling the generation of circular products. However, C2CA is a multistep, nonisothermal method, requiring multiple fluid manipulations and thereby compromises several advantages of RCA. Here, we improved C2CA to implement a one-pot, single step, isothermal reaction at temperatures ranging from 25 to 37 degrees C. Our C2CAplus method is simple, robust, and produces large quantities of product DNA that can be seen with the naked eye.