Experimental implementation and analysis of a DNA computing readout method based on real-time PCR with TaqMan probes
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A new readout approach for the Hamiltonian Path Problem (HPP) in DNA computing based on the real-time polymerase chain reaction (PCR) is experimentally implemented and analyzed. Several types of fluorescent probes and detection mechanisms are currently employed in real-time PCR, including SYBR Green, molecular beacons, and hybridization probes. In this study, real-time amplification performed using the TaqMan probes is adopted, as the TaqMan detection mechanism can be exploited for the design and development of the proposed readout approach. Double-stranded DNA molecules of length 140 base-pairs are selected as the input molecules, which represent the solving path for an HPP instance. These input molecules are prepared via the self-assembly of 20-mer and 30-mer single-stranded DNAs, by parallel overlap assembly. The proposed readout approach consists of two steps: real-time amplification in vitro using TaqMan-based real-time PCR, followed by information processing in silico to assess the results of real-time amplification, which in turn, enables extraction of the Hamiltonian path. The performance of the proposed approach is compared with that of conventional graduated PCR. Experimental results establish the superior performance of the proposed approach, relative to graduated PCR, in terms of implementation time.
KeywordsDNA computation Graduated PCR Hamiltonian path problem Readout method Real-time PCR TaqMan probes
Fluorescence Resonance Energy Transfer
Hamiltonian Path Problem
Polymerase Chain Reaction
Traveling Salesman Problem
Zuwairie Ibrahim is very grateful to Ritsumeikan Asia Pacific University (APU) for kindly granting a research subsidy to support his expenses during laboratory experimental work at APU. This work was also partially supported by a eScienceFund Research Funding (Vot No. 79033; Z. Ibrahim, N.H. Sarmin, M. Khalid), from the Ministry of Science, Technology, and Innovation (MOSTI), Malaysia, a Grant-in-Aid for Scientific Research B (18300100; J. Rose, A. Suyama), from the Japan Society for the Promotion of Science (JSPS), and JST-CREST (A. Suyama, J. Rose).
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