Department of Microbiology and Physiological Systems; Graduate School of Biomedical Sciences
Bacteria | Biochemical Phenomena, Metabolism, and Nutrition | Cell Biology | Cells | Genetic Phenomena | Microbiology | Nucleic Acids, Nucleotides, and Nucleosides
While the major events in prokaryotic cell cycle progression are likely to be coordinated with transcriptional and metabolic changes, these processes remain poorly characterized. Unlike many rapidly-growing bacteria, DNA replication and cell division are temporally-resolved in mycobacteria, making these slow-growing organisms a potentially useful system to investigate the prokaryotic cell cycle. To determine if cell-cycle dependent gene regulation occurs in mycobacteria, we characterized the temporal changes in the transcriptome of synchronously replicating populations of Mycobacterium tuberculosis (Mtb). By enriching for genes that display a sinusoidal expression pattern, we discover 485 genes that oscillate with a period consistent with the cell cycle. During cytokinesis, the timing of gene induction could be used to predict the timing of gene function, as mRNA abundance was found to correlate with the order in which proteins were recruited to the developing septum. Similarly, the expression pattern of primary metabolic genes could be used to predict the relative importance of these pathways for different cell cycle processes. Pyrimidine synthetic genes peaked during DNA replication and their depletion caused a filamentation phenotype that phenocopied defects in this process. In contrast, the IMP dehydrogenase guaB2 dedicated to guanosine synthesis displayed the opposite expression pattern and its depletion perturbed septation. Together, these data imply obligate coordination between primary metabolism and cell division, and identify periodically regulated genes that can be related to specific cell biological functions.
Microbiology, cell cycle, mycobacteria, Mycobacterium tuberculosis, DNA replication, cytokinesis, Mycobacterium tuberculosis, prokaryotic cell cycle, cell cycle associated transcription, just36 in-time transcription, divisome assembly and cytokinesis, nucleotide metabolism, 37 cytokinesis
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The copyright holder for this preprint (which was not peer-reviewed) is the author/funder. It is made available under a CC-BY-NC-ND 4.0 International license.
DOI of Published Version
bioRxiv 2020.02.10.942268; doi: https://doi.org/10.1101/2020.02.10.942268. Link to preprint on bioRxiv service.
Bandekar A, Subedi S, Ioerger T, Sassetti CM. (2020). Cell cycle-associated expression patterns predict gene function in mycobacteria. University of Massachusetts Medical School Faculty Publications. https://doi.org/10.1101/2020.02.10.942268. Retrieved from https://escholarship.umassmed.edu/faculty_pubs/1671
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