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The lag phase and G1 phase of a single yeast cell monitored by Raman microspectroscopy

Journal article
Authors Gajendra Pratap Singh
Giovanni Volpe
Caitriona M. Creely
Helga Grötsch
Isabel M. Geli
Dmitri Petrov
Published in Journal of Raman Spectroscopy
Volume 37
Pages 858-864
ISSN 03770486
Publication year 2006
Published at
Pages 858-864
Language en
Keywords G phase 1, Optical tweezers, Raman microspectroscopy, Yeast lag phase
Subject categories Biological Sciences, Physical Sciences

Abstract

We optically trapped a single yeast cell for up to 3 h and monitored the changes in the Raman spectra during the lag phase of its growth and the G 1 phase of its cell cycle. A non-budding cell (corresponding either to the G 0 or G 1 phase) was chosen for each experiment. During the lag phase, the cell synthesises new proteins and lipids and the observed behaviour of the peaks corresponding to these constituents as well as those of RNA served as a sensitive indicator of the adaptation of the cell to its changed environment. Temporal behaviour of the Raman peaks observed was different in the lag phase as compared to the late lag phase. Two different laser wavelengths were applied to study the effect of long-term optical trapping on the living cells. Yeast cells killed either by boiling or by a chemical protocol were also trapped for a long time in a single beam optical trap to understand the effect of optical trapping on the behaviour of observed Raman peaks. The changes observed in the Raman spectra of a trapped yeast cell in the late G 1 phase or the beginning of S phase corresponded to the growth of a bud. Copyright © 2006 John Wiley & Sons, Ltd.

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