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Journal of Cell Science, Vol 112, Issue 10 1449-1453, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Detection of alternative splicing of fibronectin mRNA in a single cell

T Kumazaki, Y Mitsui, K Hamada, H Sumida and M Nishiyama
Department of Biochemistry and Biophysics, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan. kumazaki@ue.ipc.hiroshima-u.ac.jp

Pre-fibronectin mRNA is subject to alternative splicing at three sites, EDA, EDB and IIICS. We analyzed the alternative splicing of fibronectin mRNA in a single cell. Reverse transcription-polymerase chain reaction analyses showed cells that produced a single form of mRNA at each one of these sites as well as cells that produced multiple forms at a given site: for example, some cells produced either the EDA(+) or EDA(-) form of the mRNA and other cells produced both forms. About 80% of the cells produced both (+) and (-) forms of the mRNA at the EDA and EDB sites, and the remaining cells contained either the (+) or (-) form. Five forms of fibronectin mRNA can result from alternative splicing at the IIICS site. Complex combinations of alternative splicing products were observed among the individual cells: there were ten different combinations of mRNA isoforms with respect to the IIICS site. Statistically significant changes in alternative splicing at the IIICS site were observed during cellular senescence.




© The Company of Biologists Ltd 1999