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Digital quantification of rolling circle amplified single DNA molecules in a resistive pulse sensing nanopore
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
2015 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 67, 11-17 p.Article in journal (Refereed) Published
Abstract [en]

Novel portable, sensitive and selective DNA sensor methods for bio-sensing applications are required that can rival conventionally used non-portable and expensive fluorescence-based sensors. In this paper, rolling circle amplification (RCA) products are detected in solution and on magnetic particles using a resistive pulse sensing (RPS) nanopore. Low amounts of DNA molecules are detected by padlock probes which are circularized in a strictly target dependent ligation reaction. The DNA-padlock probe-complex is captured on magnetic particles by sequence specific capture oligonucleotides and amplified by a short RCA. Subsequent RPS analysis is used to identify individual particles with single attached RCA products from blank particles. This proof of concept opens up for a novel non-fluorescent digital DNA quantification method that can have many applications in bio-sensing and diagnostic approaches.

Place, publisher, year, edition, pages
2015. Vol. 67, 11-17 p.
Keyword [en]
Padlock probe, RCA, Single molecule detection, Resistive pulse sensing, Nanopore
National Category
Chemical Sciences Biological Sciences
URN: urn:nbn:se:su:diva-115966DOI: 10.1016/j.bios.2014.06.040ISI: 000350076900003PubMedID: 25000851OAI: diva2:805420


Available from: 2015-04-15 Created: 2015-04-08 Last updated: 2015-04-15Bibliographically approved

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Nilsson, Mats
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