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Tightly Regulated and Heritable Division Control in Single Bacterial Cells

Dan Siegal-Gaskins ^* and Sean Crosson 

^* Department of Physics and Department of Biochemistry and Molecular Biology, and The Committee on Microbiology, University of Chicago, Chicago, Illinois 60637

Correspondence: Address reprint requests to Sean Crosson, Dept. of Biochemistry and Molecular Biology, University of Chicago, 929 E. 57th St., W125, Chicago, IL 60637. Tel.: 773-834-1926; Fax: 773-702-0439; E-mail: scrosson{at}uchicago.edu.

The robust surface adherence property of the aquatic bacterium Caulobacter crescentus permits visualization of single cells in a linear microfluidic culture chamber over an extended number of generations. The division rate of Caulobacter in this continuous-flow culture environment is substantially faster than in other culture apparati and is independent of flow velocity. Analysis of the growth and division of single isogenic cells reveals that the cell cycle control network of this bacterium generates an oscillatory output with a coefficient of variation lower than that of all other bacterial species measured to date. DivJ, a regulator of polar cell development, is necessary for maintaining low variance in interdivision timing, as transposon disruption of divJ significantly increases the coefficient of variation of both interdivision time and the rate of cell elongation. Moreover, interdivision time and cell division arrest are significantly correlated between mother and daughter cells, providing evidence for epigenetic inheritance of cell division behavior in Caulobacter. The single-cell growth/division results reported here suggest that future predictive models of Caulobacter cell cycle regulation should include parameters describing the variance and inheritance properties of this system.