A genetically encoded near-infrared fluorescent calcium ion indicator
Yong Qian, Kiryl D. Piatkevich, Benedict Mc Larney, Ahmed S. Abdelfattah, Sohum Mehta, Mitchell H. Murdock, Sven Gottschalk, Rosana S. Molina, Wei Zhang, Yingche Chen, Jiahui Wu, Mikhail Drobizhev, Thomas E. Hughes, Jin Zhang, Eric R. Schreiter, Shy Shoham, Daniel Razansky, Edward S. Boyden, Robert E. Campbell
We report an intensiometric, near-infrared fluorescent, genetically encoded calcium ion (Ca2+) indicator (GECI) with excitation and emission maxima at 678?and 704?nm, respectively. This GECI, designated NIR-GECO1, enables imaging of Ca2+ transients in cultured mammalian cells and brain tissue with sensitivity comparable to that of currently available visible-wavelength GECIs. We demonstrate that NIR-GECO1 opens up new vistas for multicolor Ca2+ imaging in combination with other optogenetic indicators and actuators.
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