Microbial cell individuality is a source of phenotypic heterogeneity. This heterogeneity is related to stochastic fluctuations in transcription or translation, despite genetically homogeneous background and constant environment conditions. Heterogeneity at single at a single-cell level is typically masked in conventional studies of microbial populations, which are based on the average behaviour of thousands or millions of cells. Here we developed a semi-automated protocol to study the growth kinetics parameters of single-growing unit (single cell or single-chain) in the dairy bacterium S. thermophilus. The results obtained revealed an unexpected heterogeneity in the lag-phase and max-velocity showing a normal distribution of the measured values. Lag-phase and max-velocity values have been significantly modified by changing the energetic status of the single-growing units before their transfer into a new medium. The approach developed could be useful to set-up the best environmental perturbations able to reduce or increase the phenotypic single-cell heterogeneity in S. thermophilus population.

A single-growing unit approach highlights phenotypic cell heterogeneity in Streptococcus thermophilus / D. Mora, S. Arioli, S. Guglielmetti, D. Zambelli. ((Intervento presentato al 10. convegno Symposium on Lactic Acid Bacteria tenutosi a Egmond aan Zee. The Netherlands nel 2011.

A single-growing unit approach highlights phenotypic cell heterogeneity in Streptococcus thermophilus

D. Mora;S. Arioli;S. Guglielmetti;
2011-09

Abstract

Microbial cell individuality is a source of phenotypic heterogeneity. This heterogeneity is related to stochastic fluctuations in transcription or translation, despite genetically homogeneous background and constant environment conditions. Heterogeneity at single at a single-cell level is typically masked in conventional studies of microbial populations, which are based on the average behaviour of thousands or millions of cells. Here we developed a semi-automated protocol to study the growth kinetics parameters of single-growing unit (single cell or single-chain) in the dairy bacterium S. thermophilus. The results obtained revealed an unexpected heterogeneity in the lag-phase and max-velocity showing a normal distribution of the measured values. Lag-phase and max-velocity values have been significantly modified by changing the energetic status of the single-growing units before their transfer into a new medium. The approach developed could be useful to set-up the best environmental perturbations able to reduce or increase the phenotypic single-cell heterogeneity in S. thermophilus population.
Settore AGR/16 - Microbiologia Agraria
Settore BIO/19 - Microbiologia Generale
Federation of European Microbiological Societies
Netherlands Society for Microbiology
http://www.lab10.org/
A single-growing unit approach highlights phenotypic cell heterogeneity in Streptococcus thermophilus / D. Mora, S. Arioli, S. Guglielmetti, D. Zambelli. ((Intervento presentato al 10. convegno Symposium on Lactic Acid Bacteria tenutosi a Egmond aan Zee. The Netherlands nel 2011.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/166934
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