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Pivetal J, Frénéa-Robin M, Haddour N, Vézy C, Zanini LF, Ciuta G, Dempsey NM, Dumas-Bouchiat F, Reyne G, Bégin-Colin S, Felder-Flesh D, Ghobril C, Pourroy G, Simonet P. Development and applications of a DNA labeling method with magnetic nanoparticles to study the role of horizontal gene transfer events between bacteria in soil pollutant bioremediation processes. Environ Sci Pollut Res Int 2015; 22:20322-20327. [PMID: 26498963 DOI: 10.1007/s11356-015-5614-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 10/13/2015] [Indexed: 06/05/2023]
Abstract
Horizontal gene transfers are critical mechanisms of bacterial evolution and adaptation that are involved to a significant level in the degradation of toxic molecules such as xenobiotic pesticides. However, understanding how these mechanisms are regulated in situ and how they could be used by man to increase the degradation potential of soil microbes is compromised by conceptual and technical limitations. This includes the physical and chemical complexity and heterogeneity in such environments leading to an extreme bacterial taxonomical diversity and a strong redundancy of genes and functions. In addition, more than 99 % of soil bacteria fail to develop colonies in vitro, and even new DNA-based investigation methods (metagenomics) are not specific and sensitive enough to consider lysis recalcitrant bacteria and those belonging to the rare biosphere. The objective of the ANR funded project “Emergent” was to develop a new culture independent approach to monitor gene transfer among soil bacteria by labeling plasmid DNA with magnetic nanoparticles in order to specifically capture and isolate recombinant cells using magnetic microfluidic devices. We showed the feasibility of the approach by using electrotransformation to transform a suspension of Escherichia coli cells with biotin-functionalized plasmid DNA molecules linked to streptavidin-coated superparamagnetic nanoparticles. Our results have demonstrated that magnetically labeled cells could be specifically retained on micromagnets integrated in a microfluidic channel and that an efficient selective separation can be achieved with the microfluidic device. Altogether, the project offers a promising alternative to traditional culture-based approaches for deciphering the extent of horizontal gene transfer events mediated by electro or natural genetic transformation mechanisms in complex environments such as soil.
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Lunov O, Zablotskii V, Syrovets T, Buechele B, Schmidt CQ, Dejneka A, Le Roy D, Dumas-Bouchiat F, Dempsey NM, Simmet T. WITHDRAWN: Static High-Gradient Magnetic Fields Activate Transient Receptor Potential Vanilloid 4 (TRPV4) Ion Channels Enabling Remote Control of Cell Function. J Biol Chem 2013:M113.470914. [PMID: 23760272 DOI: 10.1074/jbc.m113.470914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
This manuscript has been withdrawn by the Author's request.
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Osman O, Toru S, Dumas-Bouchiat F, Dempsey NM, Haddour N, Zanini LF, Buret F, Reyne G, Frénéa-Robin M. Microfluidic immunomagnetic cell separation using integrated permanent micromagnets. Biomicrofluidics 2013; 7:54115. [PMID: 24396526 PMCID: PMC3815048 DOI: 10.1063/1.4825395] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/02/2013] [Indexed: 05/03/2023]
Abstract
In this paper, we demonstrate the possibility to trap and sort labeled cells under flow conditions using a microfluidic device with an integrated flat micro-patterned hard magnetic film. The proposed technique is illustrated using a cell suspension containing a mixture of Jurkat cells and HEK (Human Embryonic Kidney) 293 cells. Prior to sorting experiments, the Jurkat cells were specifically labeled with immunomagnetic nanoparticles, while the HEK 293 cells were unlabeled. Droplet-based experiments demonstrated that the Jurkat cells were attracted to regions of maximum stray field flux density while the HEK 293 cells settled in random positions. When the mixture was passed through a polydimethylsiloxane (PDMS) microfluidic channel containing integrated micromagnets, the labeled Jurkat cells were selectively trapped under fluid flow, while the HEK cells were eluted towards the device outlet. Increasing the flow rate produced a second eluate much enriched in Jurkat cells, as revealed by flow cytometry. The separation efficiency of this biocompatible, compact micro-fluidic separation chamber was compared with that obtained using two commercial magnetic cell separation kits.
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Affiliation(s)
- O Osman
- Ampère Laboratory, Ecole Centrale Lyon, CNRS, UMR 5005, 69134 Ecully, France
| | - S Toru
- Ampère Laboratory, Ecole Centrale Lyon, CNRS, UMR 5005, 69134 Ecully, France
| | - F Dumas-Bouchiat
- Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France ; SPCTS, CNRS - University of Limoges, 12 Rue Atlantis, 87068 Limoges, France
| | - N M Dempsey
- Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France
| | - N Haddour
- Ampère Laboratory, Ecole Centrale Lyon, CNRS, UMR 5005, 69134 Ecully, France
| | - L-F Zanini
- Univ. Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France and CNRS, Inst NEEL, F-38042 Grenoble, France ; G2Elab, Grenoble Université, BP 46, 38402 St. Martin d'Hères, France
| | - F Buret
- Ampère Laboratory, Ecole Centrale Lyon, CNRS, UMR 5005, 69134 Ecully, France
| | - G Reyne
- G2Elab, Grenoble Université, BP 46, 38402 St. Martin d'Hères, France
| | - M Frénéa-Robin
- Ampère Laboratory, Université Lyon 1, CNRS, UMR 5005, 69622 Villeurbanne, France
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