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Engineering Entropy-Driven Reactions and Networks Catalyzed by DNA
David Yu Zhang,1
Andrew J. Turberfield,2
Bernard Yurke,3*
Erik Winfree1
Abstract:
Artificial biochemical circuits are likely to play as largea role in biological engineering as electrical circuits haveplayed in the engineering of electromechanical devices. Towardthat end, nucleic acids provide a designable substrate for theregulation of biochemical reactions. However, it has been difficultto incorporate signal amplification components. We introducea design strategy that allows a specified input oligonucleotideto catalyze the release of a specified output oligonucleotide,which in turn can serve as a catalyst for other reactions. Thisreaction, which is driven forward by the configurational entropyof the released molecule, provides an amplifying circuit elementthat is simple, fast, modular, composable, and robust. We haveconstructed and characterized several circuits that amplifynucleic acid signals, including a feedforward cascade with quadratickinetics and a positive feedback circuit with exponential growthkinetics.
1 Computation and Neural Systems, California Institute of Technology, MC 136-93, 1200 East California Boulevard, Pasadena, CA91125, USA. 2 Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK. 3 Bell Laboratories, Alcatel-Lucent, Murray Hill, NJ 07974, USA.
* Present address: Materials Science and Engineering Department,Boise State University, Boise, ID 83725, USA.
To whom correspondence should be addressed. E-mail: winfree{at}caltech.edu (E.W.); dzhang{at}dna.caltech.edu (D.Y.Z.)
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