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TOPICAL COLLECTIONS

A Variety of Established Methods to Study Drosophila Phototransduction
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Baruch Minke

Baruch Minke

Hebrew University, Department of Medical Neurobiology and the Edmond and Lily Safra Center for Brain Sciences (ELSC)

Dr. Baruch Minke received his PhD in physiology and biophysics from the Hebrew University of Jerusalem. During his post-doctoral training at Purdue University, IN, USA, he learned from Prof. William L. Pak the great power of Drosophila genetics and molecular genetics and combined this approach in his electrophysiological and biochemical studies of phototransduction in the fruit fly Drosophila melanogaster. He is a professor at the Faculty of Medicine of the Hebrew University and a member of the Edmond and Lily Safra Center for Brain Sciences (ELSC) of the Hebrew University in Jerusalem. He was a visiting research professor at the Max-Planck-Institut für Biologische Kybernetik in Tübingen, Germany and at the Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD, USA. He has been a Member of the Editorial Board of several International Journals. As a result of his studies on phototransduction in Drosophila, he co-discovered a new type of ion channel, which he designated the Transient Receptor Potential (TRP) channel. He investigated the biophysical and biochemical properties of TRP channels in Drosophila eyes and identified biochemically and electro-physiologically alongside Prof. Zvi Selinger, phospholipase C as a crucial component of the Drosophila TRP signaling pathway. The principles that he and his colleague Prof. Roger Hardie from Cambridge University have found in TRP channels are common to numerous biological systems, thus laying the foundation for the study of molecules that underlie mechanisms of TRP and pain, first initiated by Prof. David Julius .

Ben Katz

Ben Katz

Hebrew University, Department of Medical Neurobiology

Dr. Ben Katz received his B.Sc. in Mathematics and Philosophy from the Hebrew University in 2003. He earned his PhD (summa cum laude) from the Hebrew University in 2012 under the supervision of Dr. Baruch Minke. During his PhD, he studied the molecular determinants affecting translocation and assembly of the light activated TRP and TRPL channels and the mechanisms underlying low background dark noise in Drosophila Melanogaster. As a postdoctoral fellow in the laboratory of Dr. Alexander Binshtok, he studied a human carrying a novel loss-of-function mutation in the gene encoding for the heat activated TRPV1 channel, which is associated with nociception and pain. He is currently the head of educational laboratories in physiology and a research associate at the Department of Medical Neurobiology at the Hebrew University. He is currently investigating a structural domain of the TRPV1 channel called Ankyrin repeat and its effect on channel activation as well as phototransduction in Drosophila.

Collection Overview

Drosophila eyes have been an essential biological system for elucidating sensory signaling principles. The organization of the Drosophila compound eye, which brings about an optical phenomenon called Deep-Pseudo-Pupil (DPP), has been extensively studied in cutting-edge genetic and developmental studies. The detailed photochemical cycle of bistable photopigments has been studied in Drosophila using a genetic approach combined with electrophysiological in vivo screening protocols, which search for changes in the Prolonged-Depolarizing-Afterpotential (PDA) and Early-Receptor-Potential (ERP) phenomena. Genetic screening has contributed to the discovery of novel proteins necessary for many physiological processes. Notable examples are the inactivation-no-afterpotential D scaffold-protein and the light-activated channel transient receptor potential (TRP) and its homologue (TRPL), the founding members of the widely-spread and extensive TRP channel superfamily. Reversible light-dependent translocation of TRPL was discovered in the Drosophila eye using the DPP and immunocytochemistry, while light-dependent phosphorylation of phototransduction proteins were studied using mass spectroscopy and phosphor-specific antibodies. The genetic approach has also revealed the phosphoinositide-cycle, which drives the activation of light-activated channels. Lipidomics has thus became a key technique for understanding the functional consequences of defective proteins involved in the phosphoinositide-cycle. This collection will describe major techniques for investigating the localization and function of Drosophila retinal signaling-proteins, including important advice on the inherent difficulties hidden in these preparations. This collection should be also beneficial to scientists outside this field of research as these techniques can be adapted to other biological preparations.

Articles

Purification of Endogenous <em>Drosophila</em> Transient Receptor Potential Channels
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Purification of Endogenous Drosophila Transient Receptor Potential Channels

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Cited by 9

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2021

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Abstracts

In vivo, quantitative optophysiology from Drosophila retina.

Roger Hardie*1

1Department of Physiology, Development and Neuroscience, University of Cambridge Downing St Cambridge CB2 3DY U.K

Lipid analysis in Drosophila photoreceptors

Aastha Kumari1,

Rajan Thakur1,

Padinjat Raghu*1,

Aniruddha Panda1

1National Centre for Biological Sciences-TIFR, GKVK campus, Bellary Road, Bangalore, India.