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Reporter Gene Imaging pp 51–74Cite as

Reporter-Based BRET Sensors for Measuring Biological Functions In Vivo

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Part of the book series: Methods in Molecular Biology ((MIMB,volume 1790))

Abstract

Genetic reporter systems provide a good alternative to monitor cellular functions in vitro and in vivo and are contributing immensely in experimental research. Reporters like fluorescence and bioluminescence genes, which support optical measurements, provide exquisite sensitivity to the assay systems. In recent years several activatable strategies have been developed, which can relay specialized molecular functions from inside the cells. The application of bioluminescence resonance energy transfer (BRET) is one such strategy that has been proved to be extremely valuable as an in vitro or in vivo assay to measure dynamic events such as protein-protein interactions (PPIs).

The BRET assay using RLuc-YFP was introduced in biological research in the late 1990s and demonstrated the interaction of two proteins involved in circadian rhythm. Since then, BRET has become a popular genetic reporter-based assay for PPI studies due to several inherent attributes that facilitate high-throughput assay development such as rapid and fairly sensitive ratio-metric measurement, the assessment of PPI irrespective of protein location in cellular compartment and cost effectiveness. In BRET-based screening, within a defined proximity range of 10–100 Å, the excited energy state of the luminescent molecule excites the acceptor fluorophore in the form of resonance energy transfer, causing it to emit at its characteristic emission wavelength. Based on this principle, several such donor-acceptor pairs, using Renilla luciferase or its mutants as donor and either GFP2, YFP, mOrange, TagRFP or TurboFP as acceptor, have been reported for use.

In recent years, the applicability of BRET has been greatly enhanced by the adaptation of the assay to multiple detection devices such as a luminescence plate reader, a bioluminescence microscope and a small animal optical imaging platform. Apart from quantitative measurement studies of PPIs and protein dimerization, molecular spectral imaging has expanded the scope for fast screening of pharmacological compounds that modulate PPIs by unifying in vitro, live cell and in vivo animal/plant measurement, all using one assay. Using examples from the literature, we will describe methods to perform in vitro and in vivo BRET imaging experiments and some of its applications.

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Authors and Affiliations

  1. KS325, Molecular Functional Imaging Lab, Advanced Centre for Treatment Research and Education in Cancer (ACTREC), Tata Memorial Centre(TMC), Navi Mumbai, Maharashtra, India

    Maitreyi Rathod, Arijit Mal & Abhijit De

Authors
  1. Maitreyi Rathod
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  2. Arijit Mal
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  3. Abhijit De
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Correspondence to Abhijit De .

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Editors and Affiliations

  1. Department of Microbial Infection and Immunity, The Ohio State University, Columbus, Ohio, USA

    Purnima Dubey

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Rathod, M., Mal, A., De, A. (2018). Reporter-Based BRET Sensors for Measuring Biological Functions In Vivo. In: Dubey, P. (eds) Reporter Gene Imaging. Methods in Molecular Biology, vol 1790. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7860-1_5

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  • DOI: https://doi.org/10.1007/978-1-4939-7860-1_5

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  • Publisher Name: Humana Press, New York, NY

  • Print ISBN: 978-1-4939-7858-8

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