Université de Fribourg

A microfluidics-based method for measuring neuronal activity in Drosophila chemosensory neurons

Giesen, Lena van ; Neagu-Maier, G. Larisa ; Kwon, Jae Young ; Sprecher, Simon G.

In: Nature Protocols, 2016, vol. 11, no. 12, p. 2389–2400

Monitoring neuronal responses to defined sensory stimuli is a powerful and widely used approach for understanding sensory coding in the nervous system. However, providing precise, stereotypic and reproducible cues while concomitantly recording neuronal activity remains technically challenging. Here we describe the fabrication and use of a microfluidics system that allows precise temporally...

Université de Fribourg

A pair of pharyngeal gustatory receptor neurons regulates caffeine-dependent ingestion in drosophila larvae

Choi, Jaekyun ; Giesen, Lena van ; Choi, Min Sung ; Kang, KyeongJin ; Sprecher, Simon G. ; Kwon, Jae Young

In: Frontiers in Cellular Neuroscience, 2016, p. 181

The sense of taste is an essential chemosensory modality that enables animals to identify appropriate food sources and control feeding behavior. In particular, the recognition of bitter taste prevents animals from feeding on harmful substances. Feeding is a complex behavior comprised of multiple steps, and food quality is continuously assessed. We here examined the role of pharyngeal...

Université de Fribourg

Multimodal stimulus coding by a gustatory sensory neuron in Drosophila larvae

Giesen, Lena van ; Hernandez-Nunez, Luis ; Delasoie-Baranek, Sophie ; Colombo, Martino ; Renaud, Philippe ; Bruggmann, Rémy ; Benton, Richard ; Samuel, Aravinthan D.T. ; Sprecher, Simon G.

In: Nature Communications, 2016, vol. 7, p. 10687

Accurate perception of taste information is crucial for animal survival. In adult Drosophila, gustatory receptor neurons (GRNs) perceive chemical stimuli of one specific gustatory modality associated with a stereotyped behavioural response, such as aversion or attraction. We show that GRNs of Drosophila larvae employ a surprisingly different mode of gustatory information coding. Using a novel...

Université de Fribourg

Functional brain regeneration in the acoel worm Symsagittifera roscoffensis

Sprecher, Simon G. ; Bernardo-Garcia, F. Javier ; Giesen, Lena van ; Hartenstein, Volker ; Reichert, Heinrich ; Neves, Ricardo ; Bailly, Xavier ; Martinez, Pedro ; Brauchle, Michael

In: Biology Open, 2015, vol. 4, no. 12, p. 1688–1695

The ability of some animals to regrow their head and brain after decapitation provides a striking example of the regenerative capacity within the animal kingdom. The acoel worm Symsagittifera roscoffensis can regrow its head, brain and sensory head organs within only a few weeks after decapitation. How rapidly and to what degree it also reacquires its functionality to control behavior however...

Université de Fribourg

Potency of transgenic effectors for neurogenetic manipulation in Drosophila larvae

Pauls, Dennis ; Essen, Alina von ; Lyutova, Radostina ; Giesen, Lena van ; Rosner, Ronny ; Wegener, Christian ; Sprecher, Simon G.

In: Genetics, 2014, vol. 199, no. 1, p. 25–37

Genetic manipulations of neuronal activity are a cornerstone of studies aimed to identify the functional impact of defined neurons for animal behavior. With its small nervous system, rapid life cycle, and genetic amenability, the fruit fly Drosophila melanogaster provides an attractive model system to study neuronal circuit function. In the past two decades, a large repertoire of elegant genetic...

Université de Fribourg

In vitro imaging of primary neural cell culture from Drosophila

Egger, Boris ; Giesen, Lena van ; Moraru, Manuela ; Sprecher, Simon G.

In: Nature Protocols, 2013, vol. 8, no. 5, p. 958–965

Cell culture systems are widely used for molecular, genetic and biochemical studies. Primary cell cultures of animal tissues offer the advantage that specific cell types can be studied in vitro outside of their normal environment. We provide a detailed protocol for generating primary neural cell cultures derived from larval brains of Drosophila melanogaster. The developing larval brain contains...