What Prevents D Melanogaster From Easy Escape

. 2013 Jan 25;(71):50192.

doi: 10.3791/50192.

Optogenetic stimulation of escape behavior in Drosophila melanogaster

Affiliations

• PMID: 23380919
• PMCID: PMC3582644
• DOI: 10.3791/50192

Free PMC article

Optogenetic stimulation of escape behavior in Drosophila melanogaster

Saskia E J de Vries  et al. J Vis Exp. 2013 .

Free PMC article

Abstract

A growing number of genetically encoded tools are becoming available that allow non-invasive manipulation of the neural activity of specific neurons in Drosophila melanogaster. Chief among these are optogenetic tools, which enable the activation or silencing of specific neurons in the intact and freely moving animal using bright light. Channelrhodopsin (ChR2) is a light-activated cation channel that, when activated by blue light, causes depolarization of neurons that express it. ChR2 has been effective for identifying neurons critical for specific behaviors, such as CO(2) avoidance, proboscis extension and giant-fiber mediated startle response. However, as the intense light sources used to stimulate ChR2 also stimulate photoreceptors, these optogenetic techniques have not previously been used in the visual system. Here, we combine an optogenetic approach with a mutation that impairs phototransduction to demonstrate that activation of a cluster of loom-sensitive neurons in the fly's optic lobe, Foma-1 neurons, can drive an escape behavior used to avoid collision. We used a null allele of a critical component of the phototransduction cascade, phospholipase C-β, encoded by the norpA gene, to render the flies blind and also use the Gal4-UAS transcriptional activator system to drive expression of ChR2 in the Foma-1 neurons. Individual flies are placed on a small platform surrounded by blue LEDs. When the LEDs are illuminated, the flies quickly take-off into flight, in a manner similar to visually driven loom-escape behavior. We believe that this technique can be easily adapted to examine other behaviors in freely moving flies.

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Source: https://pubmed.ncbi.nlm.nih.gov/23380919/

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