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Comparative study reveals better far-red fluorescent protein for whole body imaging

KE. Luker, P. Pata, II. Shemiakina, A. Pereverzeva, AC. Stacer, DS. Shcherbo, VZ. Pletnev, M. Skolnaja, KA. Lukyanov, GD. Luker, I. Pata, DM. Chudakov,

. 2015 ; 5 (-) : 10332. [pub] 20150602

Language English Country England, Great Britain

Document type Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc16010137

Genetically encoded far-red and near-infrared fluorescent proteins enable efficient imaging in studies of tumorigenesis, embryogenesis, and inflammation in model animals. Here we report comparative testing of available GFP-like far-red fluorescent proteins along with a modified protein, named Katushka2S, and near-infrared bacterial phytochrome-based markers. We compare fluorescence signal and signal-to-noise ratio at various excitation wavelength and emission filter combinations using transiently transfected cell implants in mice, providing a basis for rational choice of optimal marker(s) for in vivo imaging studies. We demonstrate that the signals of various far-red fluorescent proteins can be spectrally unmixed based on different signal-to-noise ratios in different channels, providing the straightforward possibility of multiplexed imaging with standard equipment. Katushka2S produced the brightest and fastest maturing fluorescence in all experimental setups. At the same time, signal-to-noise ratios for Katushka2S and near-infrared bacterial phytochrome, iRFP720 were comparable in their optimal channels. Distinct spectral and genetic characteristics suggest this pair of a far-red and a near-infrared fluorescent protein as an optimal combination for dual color, whole body imaging studies in model animals.

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$a Chudakov, D M $u 1] Shemiakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Miklukho-Maklaya 16/10, 117997, Moscow, Russia [2] CEITEC MU, Masaryk University, Brno, Czech republic [3] Pirogov Russian National Research Medical University, 117997 Moscow, Russia.
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