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Imaging rapidly changing gene expression during embryogenesis is a challenge for the development of probes and imaging techniques. The vertebrate Segmentation Clock is a genetic network that controls the subdivision of the elongating embryonic body axis into somites, the precursors of adult segmented structures, such as vertebrae. Because of its rapid oscillations, direct observation of gene expression in this system has proven difficult, and so is a benchmark for transgene design and imaging in vivo. Transgenic approaches using destabilized reporter cassettes in the mouse embryo have provided the first glimpses of this dynamic expression system. Nevertheless, improvements in temporal and spatial resolution, paired with the ability to make precise quantifications, will be necessary to connect observations and theory. © 2011 Elsevier Ltd.
Andrew Charles Oates, Mahmut Selman Sakar, Ece Özelçi, Laurel Ann Rohde, Erfan Etesami