Transcriptional responses of Escherichia coli during recovery from inorganic or organic mercury exposure
Abstract
Background: The protean chemical properties of mercury have long made it attractive for diverse applications, but its toxicity requires great care in its use, disposal, and recycling. Mercury occurs in multiple chemical forms, and the molecular basis for the distinct toxicity of its various forms is only partly understood. Global transcriptomics applied over time can reveal how a cell recognizes a toxicant and what cellular subsystems it marshals to repair and recover from the damage. The longitudinal effects on the transcriptome of exponential phase E. coli were compared during sub-acute exposure to mercuric chloride (HgCl2) or to phenylmercuric acetate (PMA) using RNA-Seq. Results: Differential gene expression revealed common and distinct responses to the mercurials throughout recovery. Cultures exhibited growth stasis immediately after each mercurial exposure but returned to normal growth more quickly after PMA exposure than after HgCl2 exposure. Correspondingly, PMA rapidly elicited up-regulation of a large number of genes which continued for 30 min, whereas fewer genes were up-regulated early after HgCl2 exposure only some of which overlapped with PMA up-regulated genes. By 60 min gene expression in PMA-exposed cells was almost indistinguishable from unexposed cells, but HgCl2 exposed cells still had many differentially expressed genes. Relative expression ofmore »
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Georgia, Athens, GA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1618556
- Alternate Identifier(s):
- OSTI ID: 1506472
- Grant/Contract Number:
- ER64408; ER65286; FG02-07ER64408
- Resource Type:
- Published Article
- Journal Name:
- BMC Genomics
- Additional Journal Information:
- Journal Name: BMC Genomics Journal Volume: 19 Journal Issue: 1; Journal ID: ISSN 1471-2164
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Longitudinal RNA-Seq; Transcriptomics; Toxic metals; Essential metals; Stress response; Biofilm; Phenylmercury; Antibiotic resistance
Citation Formats
LaVoie, Stephen P., and Summers, Anne O. Transcriptional responses of Escherichia coli during recovery from inorganic or organic mercury exposure. United Kingdom: N. p., 2018.
Web. doi:10.1186/s12864-017-4413-z.
LaVoie, Stephen P., & Summers, Anne O. Transcriptional responses of Escherichia coli during recovery from inorganic or organic mercury exposure. United Kingdom. https://doi.org/10.1186/s12864-017-4413-z
LaVoie, Stephen P., and Summers, Anne O. Tue .
"Transcriptional responses of Escherichia coli during recovery from inorganic or organic mercury exposure". United Kingdom. https://doi.org/10.1186/s12864-017-4413-z.
@article{osti_1618556,
title = {Transcriptional responses of Escherichia coli during recovery from inorganic or organic mercury exposure},
author = {LaVoie, Stephen P. and Summers, Anne O.},
abstractNote = {Background: The protean chemical properties of mercury have long made it attractive for diverse applications, but its toxicity requires great care in its use, disposal, and recycling. Mercury occurs in multiple chemical forms, and the molecular basis for the distinct toxicity of its various forms is only partly understood. Global transcriptomics applied over time can reveal how a cell recognizes a toxicant and what cellular subsystems it marshals to repair and recover from the damage. The longitudinal effects on the transcriptome of exponential phase E. coli were compared during sub-acute exposure to mercuric chloride (HgCl2) or to phenylmercuric acetate (PMA) using RNA-Seq. Results: Differential gene expression revealed common and distinct responses to the mercurials throughout recovery. Cultures exhibited growth stasis immediately after each mercurial exposure but returned to normal growth more quickly after PMA exposure than after HgCl2 exposure. Correspondingly, PMA rapidly elicited up-regulation of a large number of genes which continued for 30 min, whereas fewer genes were up-regulated early after HgCl2 exposure only some of which overlapped with PMA up-regulated genes. By 60 min gene expression in PMA-exposed cells was almost indistinguishable from unexposed cells, but HgCl2 exposed cells still had many differentially expressed genes. Relative expression of energy production and most metabolite uptake pathways declined with both compounds, but nearly all stress response systems were up-regulated by one or the other mercurial during recovery. Conclusions: Sub-acute exposure influenced expression of ~45% of all genes with many distinct responses for each compound, reflecting differential biochemical damage by each mercurial and the corresponding resources available for repair. This study is the first global, high-resolution view of the transcriptional responses to any common toxicant in a prokaryotic model system from exposure to recovery of active growth. The responses provoked by these two mercurials in this model bacterium also provide insights about how higher organisms may respond to these ubiquitous metal toxicants.},
doi = {10.1186/s12864-017-4413-z},
journal = {BMC Genomics},
number = 1,
volume = 19,
place = {United Kingdom},
year = {Tue Jan 16 00:00:00 EST 2018},
month = {Tue Jan 16 00:00:00 EST 2018}
}
https://doi.org/10.1186/s12864-017-4413-z
Web of Science
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