Abstract
Chromatin structure is thought to play a critical role in gene expression. Using the lac operator/repressor system and two colour variants of green fluorescent protein (GFP), we developed a system to visualize a gene and its protein product directly in living cells, allowing us to examine the spatial organization and timing of gene expression in vivo. Dynamic morphological changes in chromatin structure, from a condensed to an open structure, were observed upon gene activation, and targeting of the gene product, cyan fluorescent protein (CFP) reporter to peroxisomes was visualized directly in living cells. We found that the integrated gene locus was surrounded by a promyelocytic leukaemia (PML) nuclear body. The association was transcription independent but was dependent upon the direct in vivo binding of specific proteins (EYFP/lac repressor, tetracycline receptor/VP16 transactivator) to the locus. The ability to visualize gene expression directly in living cells provides a powerful system with which to study the dynamics of nuclear events such as transcription, RNA processing and DNA repair.
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Acknowledgements
We thank T. Misteli for discussions and P. Sacco-Bubulya and N. Saitoh for reviewing the manuscript. pW7-C3 (=pCFP-C3), which encoded CFP, was provided by R. Tsien, EV-124 was provided by M. Wilkinson and pUHD10-4B was provided by J. Skowronski, and monoclonal antibody 5E10 was obtained from R. van Driel. S.M.J. is supported by an NIH/NCI training grant 5T32CA09311. D.L.S. is funded by a grant from NIGMS (NIH 498100).
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Movie 1
Visualization of gene expression Clone 2 cells were transiently transfected with EYFP/lac repressor and pTet-On and plated onto a coverslip fitted for a FCS2 live-cell chamber (Bioptechs, Butler, Pennsylvania). An image was acquired using OpenLab software (Improvision, Boston, Massachusetts); doxycline then was perfused into the live-cell chamber. Images were acquired every 10 minutes in the YFP channel for the first 2 h, after which images were obtained in bothe the YFP and CFP channels at 20-min intervals. The entire movie was taken over a 7-h period and is played back at 2,880 x. (MOV 3600 kb)
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Tsukamoto, T., Hashiguchi, N., Janicki, S. et al. Visualization of gene activity in living cells. Nat Cell Biol 2, 871–878 (2000). https://doi.org/10.1038/35046510
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DOI: https://doi.org/10.1038/35046510
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