Vortex- and Centrifugation-Free Extraction of HIV-1 RNA

Abstract

Background and Objective

HIV viral load measurements play a critical role in monitoring disease progression in those who are on antiretroviral treatment. In order to obtain an accurate measurement, rapid sample preparation techniques are required. There is an unmet need for HIV extraction instruments in resource-limited settings, where HIV prevalence is high. Therefore, the objective of our study was to develop a three-dimensional (3D) microfluidic system to extract HIV-1 RNA with minimal electricity and without complex laboratory instruments.

Methods

A 3D microfluidic system was designed in which magnetic beads bound with nucleic acids move through immiscible oil–water interfaces to separate HIV-1 RNA from the sample. Polymerase chain reaction (PCR) amplification was used to quantify the total amount of HIV-1 RNA extracted as we optimized the system through chip design, bead type, carry-over volume, carrier RNA concentration, and elution buffer temperature. Additionally, the extraction efficiency of the 3D microfluidic system was evaluated by comparing with a Qiagen EZ1 Advanced XL instrument using 20 HIV-1-positive plasma samples.

Results

Our method has near-perfect (100%) extraction efficiency in spiked serum samples with as little as 50 copies/mL starting sample. Furthermore, we report carry-over volumes of 0.31% ± 0.006% of total sample volume. Using the EZ1 Advanced XL as a gold standard, the average percentage HIV-1 RNA extracted using the microchip was observed to be 65.4% ± 24.6%.

Conclusions

From a clinical perspective, the success of our method opens up its possible use in diagnostic tests for HIV in the remote areas where access to vortexes and centrifuges is not available. Here we present a proof-of-concept device which, with further development, could be used for sample preparation at the point of care.

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Acknowledgements

The authors would like to thank Dr. Lei Zhang and Dr. Mark Bobrow for their guidance on this project.

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Correspondence to Anubhav Tripathi.

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Conflict of interest

Rachel N. Deraney, Derek Troiano, Richard Joseph, Soya S. Sam, Angela M. Caliendo, and Anubhav Tripathi declare no conflicts of interest relevant to this study.

Funding

This work was supported in part by the Providence/Boston Center for AIDS Research (P30AI042853) and in part by PerkinElmer.

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Deraney, R.N., Troiano, D., Joseph, R. et al. Vortex- and Centrifugation-Free Extraction of HIV-1 RNA. Mol Diagn Ther 23, 419–427 (2019). https://doi.org/10.1007/s40291-019-00394-1

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