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We report significant technical improvements and user-friendly software called FluoreScore that enables tracking of 3D movement and the dynamics of gene expression in adult Drosophila, using two cameras and recorded GFP videos. Expression of a transgenic construct encoding eGFP was induced in free-moving adult flies using the Gene-Switch system and RU drug feeding. We have previously reported methods that allow for 3D video tracking of Drosophila melanogaster movement behaviors [6] , [7] , while simultaneously quantifying gene expression using fluorescent reporter proteins [8] , [9]. Calibration of the two stationary cameras using the Camera Calibration Tools and CalibHelp software produces a camera projection matrix; detailed steps are provided in supplementary materials, experimental protocol Protocol S1 , and are also available for download from http: Numerous steps are required for the induction of fluorescence, including animal feeding behavior, absorption of drug across the intestinal epithelium, and transport of the drug through the haemolymph to various internal tissues including the CNS.

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Finally, the size in pixels of each detected component i.

Using GFP Video to Track 3D Movement and Conditional Gene Expression in Free-Moving Flies

Numerous steps are required for the induction of fluorescence, including animal feeding behavior, absorption of drug across the intestinal epithelium, and transport of the drug through the haemolymph to various internal tissues including the CNS. The Actin-GS[B] construct drives expression of the Gene-Switch transcription factor in all the somatic tissues of the fly, whereas the Elav-GS construct drives expression of Gene-Switch specifically in neurons.

Realistic Rain Drop FX! Binning the pixels based upon intensity allows the data to be analyzed and visualized in the absence of prahamesh.


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Gene-Switch is a chimeric transcription factor consisting of a mutated human progesterone receptor-ligand binding domain, the yeast GAL4 DNA binding domain, and part of the transcriptional activation domain of the human p65 protein [18]. High-throughput ethomics in large groups of Drosophila. To facilitate processing of the multiple videos resulting from assays of multiple hours or days, a command line version of the FluoreScore software suite was created, and a batch file was generated to run each software module from the command line.

FloureScore analyzes the videos and produces outputs files in. The FluoreScore output includes pixel number and intensity values for the detected fly or group of flies, as well as position values X, Y when tracking movement of single flies. Combining 3D tracking of Drosophila with simultaneous quantification of fluorescence allows for correlations between transgene expression, behavior, and aging [6][8][9] ; however, application of this approach has been impeded by the difficulty of operating the systems.

Several groups have reported methods for tracking 2D and 3D movement of Drosophila and other flies [7][20] — [28].

For each fly, the histogram of pixel intensity values is calculated along with the sum of intensities for each bin of the histogram. The FluoreScore software suite is divided nams several modules to facilitate use and future upgrades Figure 1b. Additional details on hardware and software and detailed step-by-step instructions are provided in supplementary materials, experimental protocol Protocol S1.

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A running Gaussian average approach is employed, and the background is modeled independently at each pixel; this model fits a Gaussian distribution to the intensity values of the pixel in previous frames.

Voog J, Jones DL. Open in a separate window. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Namf position of the fly is plotted Red squares. The MF filters are fixed in front of the LEDs to limit the light illuminating the flies to a range of approximately nm to nm, which overlaps the eGFP absorption peak at approximately nm. prathamdsh


Let be a binary value that is 1 if the pixel is background and 0 otherwise. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

For example, tracking animal movement in 3D with simultaneous quantification of fluorescent transgenic reporters allows for correlations between behavior, aging and gene expression. Induction of stable eGFP expression was first detected at 10 hours in the lower intensity range G2; Figure 6iand at 13 hours in the higher intensity range G3; Figure 6 hand continued to increase through the end of the hour tracking period.

FluoreScore allows fluorescence to be quantified in groups of free-moving flies, and provides 3D movement patterns with simultaneous fluorescence quantification for single flies. Recording Images The data storage capacity of the operating system employed here requires that files be smaller than 2GB; therefore Videograbber will record videos in separate files of a length offrames equal to 1 hr at 30fps.

Received Feb 11; Accepted Jun P[Switch], a system for spatial and temporal control of gene expression in Drosophila melanogaster. Roman G, Davis RL.


In conclusion, FluoreScore is freely available and user-friendly software that enables quantification of movement, behavior, and conditional gene expression in internal tissues in free-moving flies. Video of a single male fly was recorded for 5 minutes and the data were analyzed using FluoreScore and FluoreScore3D. Overview of system and data analysis. O fly, where art thou? Stem cells and the niche:

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