Molecular rheotaxis directs DNA migration and concentration against a pressure-driven flow

Nature Communications
Sarah M FriedrichTza-Huei Wang

Abstract

In-line preconcentration techniques are used to improve the sensitivity of microfluidic DNA analysis platforms. The most common methods are electrokinetic and require an externally applied electric field. Here we describe a microfluidic DNA preconcentration technique that does not require an external field. Instead, pressure-driven flow from a fluid-filled microcapillary into a lower ionic strength DNA sample reservoir induces spontaneous DNA migration against the direction of flow. This migratory phenomenon that we call Molecular Rheotaxis initiates in seconds and results in a concentrated DNA bolus at the capillary orifice. We demonstrate the ease with which this concentration method can be integrated into a microfluidic total analysis system composed of in-line DNA preconcentration, size separation, and single-molecule detection. Paired experimental and numerical simulation results are used to delineate the parameters required to induce Molecular Rheotaxis, elucidate the underlying mechanism, and optimize conditions to achieve DNA concentration factors exceeding 10,000 fold.

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Citations

Sep 20, 2018·Electrophoresis·Ryan J MontesAnthony J C Ladd
Dec 12, 2018·Soft Matter·Patrick B WarrenHoward A Stone
Jan 22, 2019·Soft Matter·Jesse T AultHoward A Stone
Aug 12, 2020·Lab on a Chip·Pengzhan LiuTony Jun Huang
Apr 26, 2019·Soft Matter·Sarah BattatHoward A Stone
Jan 2, 2020·Biomicrofluidics·Ryan J MontesJason E Butler
Oct 28, 2020·Small·Md Sohel RanaKun Qian
Dec 21, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Trevor J ShimokusuSangwoo Shin

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Methods Mentioned

BETA
confocal spectroscopy
electrophoresis

Software Mentioned

COMSOL
COMSOL Multiphysics
ImageJ
LabVIEW
COMSOL Multiphysics®
FASS

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