Label-free and sensitive detection of RNA demethylase FTO with primer generation rolling circle amplification

We develop for the first time a label-free fluorescent method for sensitive detection of fat mass and obesity-associated protein (FTO) activity using MazF-mediated primer generation rolling circle amplification. This method is very simple with ultrahigh sensitivity and good specificity, and it can detect FTO activity at the single-cell level. Moreover, this method can be applied for the measurement of kinetic parameters and the screening of FTO inhibitors.