Cryo-electron tomography is an emerging electron microscopy technique for determining three-dimensional structures of cellular architectures near their native state at nanometer resolution, with a shortcoming of lack of specific labels. Fluorescence light microscopy, on the other hand, specifically visualizes target cellular and molecular components with fluorescent labels, but is limited to a resolution of tens to hundreds nanometers. Combining the advantages of the two techniques, we have developed a cryo-correlative light and electron microscopy system. Our system consists a custom-designed cryo-chamber that allows for fluorescence imaging of frozen-hydrated samples, and an algorithm to achieve accurate correlation. With this system and our optimized protocol, high-quality tomograms of neuronal synapses labelled by specific fluorescent tags in cultured hippocampal neurons are obtained at high efficiency.
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Sun, R., Liu, Y.-T., Tao, C.-L., Qi, L., Lau, P.-M., Zhou, Z. H., & Bi, G.-Q. (2019). An efficient protocol of cryo-correlative light and electron microscopy for the study of neuronal synapses. Biophysics Reports, 5(3), 111–122. https://doi.org/10.1007/s41048-019-0092-4