The field of optogenetics uses genetically encoded, lightresponsive proteins to control physiological processes. This technology has been hailed as the one of the ten big ideas in brain science in the past decade, the breakthrough of the decade, and the method of the year in 2010 and again in 2014. The excitement evidenced by these proclamations is confirmed by a couple of impressive numbers. The term "optogenetics" was coined in 2006. As of December 2017, "optogenetics" is found in the title or abstract of almost 1600 currently funded National Institutes of Health grants. In addition, nearly 600 reviews on optogenetics have appeared since 2006, which averages out to approximately one review per week! However, in spite of these impressive numbers, the potential applications and implications of optogenetics are not even close to being fully realized. This is due, in large part, to the challenges associated with the design of optogenetic analogues of endogenous proteins. This review is written from a chemist's perspective, with a focus on the molecular strategies that have been developed for the construction of optogenetic proteins.
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