The project EXPAND combines Expansion Microscopy (ExM), a method that expands biological samples up to 20 times, with other super-resolution microscopy approaches to investigate chemical synapses and neural circuits an the nanometer scale. Moreover, neural circuits will be imaged in large samples with increased resolution by combining ExM with mesoscale selective plane illumination microscopy (mesoSPIM). This allows us to bridge the gap between the subsynaptic and the neural circuit level and to elucidate how gene variants causing neurodevelopmental disorders (e.g. FOXP1) affect neural circuit architecture across spatial scales.
We currently analyze the role of FoxP, a gene family associated with autism spectrum disorders, in axon guidance in chicken embryos. In addition, we combine ExM and stumulated emission depletion (STED) super-resolution microscopy to probe homeostatic modulation of synaptic nano-architecture in human iPSC-derived neurons, as well as Drosophila synapses.
This project will provide the URPP with a versatile toolbox and an experimental pipeline that allows the systematic examination of neural circuits at increased resolution, and the characterization of candidate disease genes identified in patients.
Principal investigators: Martin Müller, Esther Stoeckli, Anita Rauch
PhD students: Nasrin Bollmohr, Marta Brasili, Lisa Kistler, Gonzalo Saiz-Castro, Hanna Yeliseyeva
Muttathukunnel P, Frei P, Perry S, Dickman D, Müller M (2022) Rapid homeostatic modulation of transsynaptic nanocolumn rings. PNAS 119.
Underlined: Current and previous AdaBD researchers