title: A novel approach to Au nanoparticle-based identification of DNA nanoarrays.
abstract: The combination of electron beam lithography and gold nanoparticle-based detection method is subject to a novel high-resolution approach to detecting DNA nanoarrays. In this work, gold nanoparticle-based detection of DNA hybridization on nanostructured arrays is presented. The nanostructured arrays were created by electron beam lithography of a self-assembled monolayer. Amine groups, which are active moieties and are used for attachment of DNA, were introduced to the nanostructures, and the amine-modified structures were characterized by scanning Maxwell-stress microscopy (SMM) for seeing the modification process. The DNA probe covalently immobilized within the nanostructures was hybridized with a biotinylated target DNA. Streptavidin-gold conjugate was then bound to the biotin, thereby assembling inside the nanostructured arrays. The sequence-specific hybridization was imaged by atomic force microscopy (AFM). On the other hand, the activity of the DNA molecules within the nanostructured arrays was verified by fluorescence microscopy using streptavidin-Cy 5 conjugate instead of streptavidin-gold nanoparticles conjugate. On the basis of fluorescent detection, an alternative method has been developed for detection of DNA nanostructures, which will benefit the development of DNA chips.
authors.affiliation: Institute of Biomedical Engineering and Nanotechnology Research Center, Waseda University, Waseda Tsurumaki-cho, Shinjuku-ku, Tokyo, Japan. zhanggj@ime.a-star.edu.sg
authors.forename: Guo-Jun
authors.initials: GJ
authors.lastname: Zhang
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanii
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Kanari
authors.forename: Chiaki
authors.initials: C
authors.lastname: Yasumuro
authors.forename: Takashi
authors.initials: T
authors.lastname: Matsukawa
authors.forename: Meishoku
authors.initials: M
authors.lastname: Masahara
authors.forename: Iwao
authors.initials: I
authors.lastname: Ohdomari
mesh_terms: D004247:DNA / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles; D018625:Microscopy, Atomic Force; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis
chemical_list: D006046:Gold; D004247:DNA