Developing Drosophila melanogaster Models for Imaging and Optogenetic Control of Cardiac Function

Area of Science:

• Cardiovascular Research
• Optogenetics
• Model Organisms

Background:

• Drosophila melanogaster is a valuable model for biological research, including human disease modeling.
• Understanding and manipulating heart function in vivo is crucial for cardiovascular studies.

Purpose of the Study:

• To develop and validate a non-invasive system for monitoring and controlling Drosophila heart function using optogenetics and red light.
• To demonstrate the feasibility of optogenetically induced cardiac arrest, bradycardia, and pacing in fruit flies.

Main Methods:

• Utilized a custom integrated optical coherence tomography (OCT) imaging and optogenetic stimulation system.
• Employed the UAS/GAL4 system to express opsins (eNpHR2.0 and ReaChR) in the Drosophila heart.
• Developed custom software for data processing and quantitative analysis of heart function.

Main Results:

• Successfully visualized and modulated Drosophila melanogaster heart function in live larvae and pupae.
• Demonstrated optogenetic induction of cardiac arrest and bradycardia using halorhodopsin (eNpHR2.0).
• Achieved optogenetic heart pacing via red-shifted channelrhodopsin (ReaChR) activation.

Conclusions:

• The developed system enables precise, non-invasive control of fruit fly heart activity.
• This optogenetic approach provides a powerful tool for studying cardiac physiology and disease in Drosophila.
• The methodology is applicable to various developmental stages of Drosophila melanogaster.