Synthesis of circular double-stranded DNA having single-stranded recognition sequence as molecular-physical probe for nucleic acid hybridization detection based on atomic force microscopy imaging

Koji Nakano, Hideshi Matsunaga, Masaharu Murata, Nobuaki Soh, Toshihiko Imato

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A new class of DNA probes having a mechanically detectable tag is reported. The DNA probe, which consists of a single-stranded recognition sequence and a double-stranded circular DNA entity, was prepared by polymerase reaction. M13mp18 single strand and a 32mer oligodeoxynucleotide whose 5'-end is decorated with the recognition sequence were used in combination as template and primer, respectively. We have successfully demonstrated that the DNA probe is useful for bioanalytical purposes: by deliberately attaching target DNA molecules onto Au(111) substrates and by mechanically reading out the tag-entity using a high-resolution microscopy including atomic force microscopy, visualization/detection of the individual target/probe DNA conjugate was possible simply yet straightforwardly. The present DNA probe can be characterized as a 100%-nucleic acid product material. It is simply available by one-pod synthesis. A surface topology parameter, image roughness, has witnessed its importance as a quantitative analysis index with particular usability in the present visualization/detection method. 2009

Original languageEnglish
Pages (from-to)993-998
Number of pages6
Journalanalytical sciences
Issue number8
Publication statusPublished - Aug 2009


All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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