Development of an on-disc isothermal in vitro amplification and detection of bacterial RNA

Des Brennan, Helena Coughlan, Eoin Clancy, Nikolay Dimov, Thomas Barry, David Kinahan, Jens Ducrée, Terry J. Smith, Paul Galvin

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
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Abstract

We present a centrifugal microfluidic “Lab-on-a-Disc” (LoaD) system capable of implementing nucleic acid in vitro amplification using non-contact heating and fluorescence detection. The system functionality is verified by implementing a Nucleic Acid Sequence Based Amplification (NASBA) reaction, targeting the tmRNA transcript of Haemophilus influenzae. The NASBA assay incorporates fluorescent molecular beacon probes reporting target tmRNA amplification for endpoint detection. The system implements non-contact IR heating to heat the NASBA reaction to the required target temperatures during denaturation and amplification steps. The LoaD control system facilitates spin speed and chamber positioning for heating and fluorescence detection. The LoaD alignment system uses magnetic fields to locate and lock the chamber in the required position (heating or detection). The NASBA assay was implemented on the system using Haemophilus influenzae tmRNA over the range 102–104 cell equivalent (CE) units. For comparison, identical qNASBA assays were implemented on a Roche LightCycler 2.0 over this concentration range.

Original languageEnglish
Pages (from-to)235-242
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume239
Early online date3 Aug 2016
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • Fluorescence detection
  • IR heating
  • Isothermal amplification
  • Lab-on-a-Disc(LoaD)
  • tmRNA

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