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[Abstract] Fertilization calcium waves are a conserved trigger for animal development; however, genetic analysis of these waves has been limited due to the difficulty of imaging in vivo fertilization. Here we describe a protocol to image calcium dynamics during in vivo fertilization in the genetic animal model Caenorhabditis elegans. This protocol consists of germline microinjection of a chemical calcium indicator, worm immobilization, live imaging, and image processing that quantifies the calcium fluorescence in the oocyte region moving in the field-of-view during ovulation. This imaging protocol can also be used to image other cellular processes during in vivo fertilization in C. elegans, such as membrane fusion and cytoskeletal dynamics.

In vivo Live Imaging of Calcium Waves and Other Cellular Processes during Fertilization in Caenorhabditis elegans