Abstract
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 °C. Our C2CAplus method is simple, robust, and produces large quantities of product DNA that can be seen with the naked eye.
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