The present disclosure is directed methods and products for synthesizing and using targeted templated assembly reactants comprising at least one nucleic acid recognition moiety, at least one selectively-reactive moiety, and at least one effector partial moiety. The nucleic acid recognition moiety can bind a target nucleic acid sequence within a sample. The nucleic acid recognition moiety also can bind the selectively-reactive moiety. Additionally, the effector partial moiety can bind the selectively-reactive moiety to produce an active effector structure. Also disclosed are methods of delivering the targeted templated assembly reactants and active effector structures formed from the targeted templated assembly reactants.