Optogenetics in Drosophila

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Optogenetics

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1293))

Abstract

The fruit fly Drosophila melanogaster, an insect 4 mm long, has served as the experimental subject in a wide range of biological research, including neuroscience. In this chapter, we briefly introduce optogenetic applications in Drosophila neuroscience research. First, we describe the development of Drosophila from egg to adult. In fly neuroscience, temperature-controlled perturbation of neural activity, sometimes called “thermogenetics,” has been an invaluable tool that predates the advent of optogenetics. After briefly introducing this perturbation technique, we describe the process of generating transgenic flies that express optogenetic probes in a specific group of cells. Transgenic techniques are crucial in the application of optogenetics in Drosophila neuroscience; here we introduce the transposon P-elements, ϕC31 integrase, and CRISPR-Cas9 methods. As for cell-specific gene expression techniques, the binary expression systems utilizing Gal4-UAS, LexA-lexAop, and Q-system are described. We also present a short and basic optogenetic experiment with Drosophila larvae as a practical example. Finally, we review a few recent studies in Drosophila neuroscience that made use of optogenetics. In this overview of fly development, transgenic methods, and applications of optogenetics, we present an introductory background to optogenetics in Drosophila.

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Abbreviations

ATR:

All-Trans Retinal

attB:

the Bacterial attachment site

attP:

the Phage attachment site

Cas9:

CRISPR Associated protein 9

ChR2:

Channelrhodopsin 2

CRISPR:

Clustered Regularly Interspaced Short Palindromic Repeats

FRT:

Flippase Recognition Target

GDLs:

GABAergic DorsoLateral neurons

GFP:

Green Fluorescent Protein

PMSIs:

Period-positive Median Segmental Interneurons

TRP:

Transient Receptor Potential

UAS:

the Upstream Activation Sequence

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Acknowledgments

We thank Ms. Kasumi Shibahara for help with preparing the figures. This work was supported by MEXT/JSPS KAKENHI grants (22115002, 15H04255, 221S0003 to A.N. and 26430004, 17 K07042, 20 K06908 to H.K.).

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Correspondence to Hiroshi Kohsaka .

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Kohsaka, H., Nose, A. (2021). Optogenetics in Drosophila. In: Yawo, H., Kandori, H., Koizumi, A., Kageyama, R. (eds) Optogenetics. Advances in Experimental Medicine and Biology, vol 1293. Springer, Singapore. https://doi.org/10.1007/978-981-15-8763-4_19

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