Methods and devices are provided for characterizing a duplex
nucleic acid, e.g., a duplex
DNA molecule. In the subject methods, a fluid conducting medium that includes a duplex
nucleic acid molecule is contacted with a
nanopore under the influence of an applied
electric field and the resulting changes in current through the
nanopore caused by the duplex
nucleic acid molecule are monitored. The observed changes in current through the
nanopore are then employed as a set of data values to characterize the duplex nucleic acid, where the set of data values may be employed in raw form or manipulated, e.g., into a current
blockade profile. Also provided are nanopore devices for practicing the subject methods, where the subject nanopore devices are characterized by the presence of an
algorithm which directs a
processing means to employ monitored changes in current through a nanopore to characterize a duplex
nucleic acid molecule responsible for the current changes. The subject methods and devices find use in a variety of applications, including, among other applications, the identification of an
analyte duplex
DNA molecule in a sample, the specific
base sequence at a single nulceotide polymorphism (SNP), and the sequencing of duplex
DNA molecules.