Single-molecule imaging of {beta}-actin mRNAs in the cytoplasm of a living cell
- Laboratory of Bio-Analytical Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)
- Laboratory of Genome Technology, Department of Human Genome Research, Kazusa DNA Research Institute, Kisarazu, Chiba 292-0818 (Japan)
- Major in Integrative Bioscience and Biomedical Engineering, Graduate School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555 (Japan)
{beta}-Actin mRNA labeled with an MS2-EGFP fusion protein was expressed in chicken embryo fibroblasts and its localization and movement were analyzed by single-molecule imaging. Most {beta}-Actin mRNAs localized to the leading edge, while some others were observed in the perinuclear region. Singe-molecule tracking of individual mRNAs revealed that the majority of mRNAs were in unrestricted Brownian motion at the leading edge and in restricted Brownian motion in the perinuclear region. The macroscopic diffusion coefficient of mRNA (D{sub MACRO}) at the leading edge was 0.3 {mu}m{sup 2}/s. On the other hand, D{sub MACRO} in the perinuclear region was 0.02 {mu}m{sup 2}/s. The destruction of microfilaments with cytochalasin D, which is known to delocalize {beta}-actin mRNAs, led to an increase in D{sub MACRO} to 0.2 {mu}m{sup 2}/s in the perinuclear region. These results suggest that the microstructure, composed of microfilaments, serves as a barrier for the movement of {beta}-actin mRNA.
- OSTI ID:
- 22209811
- Journal Information:
- Experimental Cell Research, Vol. 315, Issue 7; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0014-4827
- Country of Publication:
- United States
- Language:
- English
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