title: Enhanced recognition of single-base mismatch using locked nucleic acid-integrated hairpin DNA probes revealed by atomic force microscopy nanolithography.
abstract: Probe design is a critical parameter in successful DNA and RNA target detection. In this proof-of-concept study, we evaluated the single-base mismatch recognition power of surface immobilized and self-assembled stem-loop hairpin DNA oligonucleotide probes modified to contain locked nucleic acid residues (LNA-HP). The stiffness change in conjunction with the stem opening of the interfacial molecules before and after hybridization led to clear variations of the overall film thickness or miniaturized nanospot height, which could be directly measured using an atomic force microscopy (AFM) nanolithography technique. Particularly, LNA-HP achieved highly differentiable readouts between perfectly complementary and singly mismatched targets (discrimination ratio as high as 2 to 3), outperforming the selectivity of its linear and hairpin counterparts with no LNA modification.
authors.affiliation: Department of Chemistry, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424.
authors.forename: Wen-Hsin
authors.initials: WH
authors.lastname: Han
authors.forename: Jun-Min
authors.initials: JM
authors.lastname: Liao
authors.forename: Kuan-Liang
authors.initials: KL
authors.lastname: Chen
authors.forename: Shin-Mou
authors.initials: SM
authors.lastname: Wu
authors.forename: Yi-Wen
authors.initials: YW
authors.lastname: Chiang
authors.forename: Shu-Ting
authors.initials: ST
authors.lastname: Lo
authors.forename: Cheng-Lung
authors.initials: CL
authors.lastname: Chen
authors.forename: Chao-Ming
authors.initials: CM
authors.lastname: Chiang
mesh_terms: D020137:Base Pair Mismatch; D001483:Base Sequence; D015342:DNA Probes / Q000737:chemistry*; D018625:Microscopy, Atomic Force / Q000379:methods*; D009693:Nucleic Acid Hybridization; D012680:Sensitivity and Specificity; D013499:Surface Properties
chemical_list: D015342:DNA Probes