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Electrophysiological Methods for Measuring Photopigment Levels in Drosophila Photoreceptors
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Chapters
- 00:04Introduction
- 00:50Measuring the Prolonged Depolarizing Afterpotential (PDA) and the Early Receptor Potential (ERP) Using the Electroretinogram (ERG)
- 05:28Results: Detecting Abnormalities in Photopigment Biogenesis by Measuring Photopigment Levels in Drosophila Using the Electroretinogram
- 07:13Conclusion
We present a protocol to electrophysiologically characterize bi-stable photopigments: (i) exploiting the charge displacements within the photopigment molecules following photon-absorption and their huge amount in the photoreceptors, and (ii) exploiting the absorption-spectra differences of rhodopsin and metarhodopsin photopigment states. These protocols are useful to screen for mutations affecting bi-stable photopigment systems.
Tags
Keywords:
ElectrophysiologicalPhotopigmentDrosophilaPhotoreceptorsPhototransductionGenetic ScreenIn VivoElectrophysiologyRecording ElectrodeGround ElectrodeClampexAmplifierMaster-8Xenon LampShutter ControllerGlass CapillaryRinger SolutionPlatinum-iridium FilamentWaxAnesthetized FliesFly HolderFaraday CageMagnet BlockLight Guide
