title: 2D aggregation and selective desorption of nanoparticle probes: a new method to probe DNA mismatches and damages.
abstract: A 2D colorimetric DNA sensor is reported based on the 2D aggregation of oligonucleotide-modified gold nanoparticle probes resulting from the molecular hybridization between these latest and their complementary single stranded DNA targets. To increase their mobility the nanoparticles are adsorbed on a fluid lipid bilayer, itself supported on a substrate. The hybridization between the target and the mobile nanoparticle probes creates links between the nanoparticles resulting in the formation of nanoparticle aggregates in the plane of the substrate. This aggregation is detected using a new method based on the selective desorption of non-aggregated nanoparticles. The addition of dextran sulfate induces the substitution of non-aggregated gold nanoparticles while aggregated ones are stable on the substrate. We show that this detection method is highly specific and allows the detection of DNA mismatches and damages.
authors.affiliation: CRMCN, CNRS, Université de la Méditerranée, Marseille, France. charrier@crmcn.univ-mrs.fr
authors.forename: Anne
authors.initials: A
authors.lastname: Charrier
authors.forename: Nadine
authors.initials: N
authors.lastname: Candoni
authors.forename: Natalia
authors.initials: N
authors.lastname: Liachenko
authors.forename: Franck
authors.initials: F
authors.lastname: Thibaudau
mesh_terms: D020137:Base Pair Mismatch; D015374:Biosensing Techniques; D004247:DNA / Q000032:analysis* / Q000737:chemistry; D004249:DNA Damage; D053768:Metal Nanoparticles
chemical_list: D004247:DNA