Microfluidic System for Detection of Viral RNA in Blood Using a Barcode Fluorescence Reporter and a Photocleavable Capture Probe

Analytical Chemistry
Ke DuR A Mathies

Abstract

A microfluidic sample preparation multiplexer (SPM) and assay procedure is developed to improve amplification-free detection of Ebola virus RNA from blood. While a previous prototype successfully detected viral RNA following off-chip RNA extraction from infected cells, the new device and protocol can detect Ebola virus in raw blood with clinically relevant sensitivity. The Ebola RNA is hybridized with sequence specific capture and labeling DNA probes in solution and then the complex is pulled down onto capture beads for purification and concentration. After washing, the captured RNA target is released by irradiating the photocleavable DNA capture probe with ultraviolet (UV) light. The released, labeled, and purified RNA is detected by a sensitive and compact fluorometer. Exploiting these capabilities, a detection limit of 800 attomolar (aM) is achieved without target amplification. The new SPM can run up to 80 assays in parallel using a pneumatic multiplexing architecture. Importantly, our new protocol does not require time-consuming and problematic off-chip probe conjugation and washing. This improved SPM and labeling protocol is an important step toward a useful POC device and assay.

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Citations

Aug 28, 2020·Reviews in Medical Virology·Arefeh BasiriNima Rezaei
Dec 20, 2018·Chemical Society Reviews·Mingzhu YangXingyu Jiang
Jan 27, 2021·Emergent Materials·Özgecan ErdemFatih Inci
Sep 6, 2018·Biomacromolecules·Yun Jung YangBradley D Olsen
Nov 10, 2018·Analytical Chemistry·Yanling SongChaoyong Yang

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