Cited by 74Tuberculosis Research and EpidemiologyMycobacterium research and diagnosisInfectious Diseases and Tuberculosis

Non-Replicating Mycobacterium tuberculosis Elicits a Reduced Infectivity Profile with Corresponding Modifications to the Cell Wall and Extracellular Matrix

Open access
Bacon, Joanna, Alderwick, Luke J., Allnutt, Jon A., Gabasova, Evelina, Watson, Robert, Hatch, Kim A., Clark, Simon O., Jeeves, Rose E. +9 more·2014·PLoS ONE

Abstract

A key feature of Mycobacterium tuberculosis is its ability to become dormant in the host. Little is known of the mechanisms by which these bacilli are able to persist in this state. Therefore, the focus of this study was to emulate environmental conditions encountered by M. tuberculosis in the granuloma, and determine the effect of such conditions on the physiology and infectivity of the organism. Non-replicating persistent (NRP) M. tuberculosis was established by the gradual depletion of nutrients in an oxygen-replete and controlled environment. In contrast to rapidly dividing bacilli, NRP bacteria exhibited a distinct phenotype by accumulating an extracellular matrix rich in free mycolate and lipoglycans, with increased arabinosylation. Microarray studies demonstrated a substantial down-regulation of genes involved in energy metabolism in NRP bacteria. Despite this reduction in metabolic activity, cells were still able to infect guinea pigs, but with a delay in the development of disease when compared to exponential phase bacilli. Using these approaches to investigate the interplay between the changing environment of the host and altered physiology of NRP bacteria, this study sheds new light on the conditions that are pertinent to M. tuberculosis dormancy and how this organism could be establishing latent disease.

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Crossref · 10.1371/journal.pone.0087329

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  • EmbR is also phosphorylated by PknH, which is likely present in both growth and stasis on the basis of transcriptional and mutant survival data.

    “EmbR is also phosphorylated by PknH86, which is likely present in both growth and stasis on the basis of transcriptional and mutant survival data14,72,81.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [14]

    The Discussion ('The composition of extracellular material') reports that pknH is up-regulated in stationary phase, and the Results ('Global gene expression analysis,' Table 2) list it among genes up-regulated in late stationary phase. These transcriptional findings support the stasis portion of the inference, but the cited paper does not establish PknH's presence in both growth and stasis from transcriptional and mutant-survival data. The phosphorylation statement carries a separate citation in the citing sentence. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • fbpB expression and fbpA expression increase during growth, resulting in high TDM levels and low levels of free mycolic acids.

    “fbpB expression and fbpA expression increase during growth65,106, resulting in high TDM levels and low levels of free mycolic acids14,65,107,108.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [14]

    The Results section (‘Re-modeling of the cell wall’; page unavailable) reports that free mycolates increased while TDM decreased as cultures progressed from exponential growth toward non-replication. This supports relatively higher TDM and lower free mycolates at the earlier growth stage. The passages do not establish increased fbpA or fbpB expression or show that their expression caused those lipid levels. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • On entry into stasis, production of TMM and TDM decreases, whereas the levels of free mycolic acids increase and production of mycolylated arabinogalactan keeps pace with the slowed growth rate.

    “On entry into stasis, production of TMM and TDM decreases107, whereas the levels of free mycolic acids increase14 and production of mycolylated arabino- galactan keeps pace with the slowed growth rate.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [14]

    The Results (‘Re-modeling of the cell wall’; page unavailable) show that TDM and TMM content declined as the cultures entered stationary and non-replicating phases. The cited paper does not establish that their production decreased; the Discussion (‘The composition of extracellular material’) instead raises increased TDM cleavage as a possible explanation. Citation 107 is attached to the TMM/TDM clause, not the later free-mycolic-acid or arabinogalactan claims. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Differential transcription of arabinotransferases may help keep LAM synthesis high when arabinogalactan synthesis slows on entry into stasis in the chronic phase.

    “Differential transcription of these arabinotransferases may help keep LAM synthe- sis high14 when arabinogalactan synthesis slows on entry into stasis in the chronic phase.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [14]

  • Regulation of the cell wall affects immune responses and determines sensitivity to antibiotics.

    “regulation of the cell wall affects immune responses13 (Box 1) and determines sensitivity to antibiotics14–18 (Box 2).”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [14]

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2 of the 65 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [14]Dobson G, Minnikin DE, Minnikin SM, Partlett JH, Goodfellow M, et al.. (1985) Systematic Analysis of Complex Mycobacterial Lipids. London: Academic Press.
  2. [17]Carl Edward Rasmussen, Christopher KI Williams (2006) Guassian Processes for Machine Learning. Cambridge MA: MIT Press.

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Authors
Bacon, J., Alderwick, L. J., Allnutt, J. A., Gabasova, E., Watson, R., Hatch, K. A., Clark, S. O., Jeeves, R. E., Marriott, A., Rayner, E., Tolley, H., Pearson, G., Hall, G., Besra, G. S., Wernisch, L., Williams, A., & Marsh, P. D.
Affiliations
  • Public Health England (GB)
  • University of Birmingham (GB)
  • MRC Biostatistics Unit (GB)
Corresponding author
Bacon, Joanna
Venue
PLoS ONE
Published
2014-02-06
Volume
9
Issue
2
Pages
e87329
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2069913108
Cited by
74
References
65
Citations by year
2026: 3 · 2025: 6 · 2024: 9 · 2023: 6 · 2022: 7 · 2021: 8 · 2020: 8 · 2019: 6 · 2018: 3 · 2017: 6 · 2016: 5 · 2015: 4 · 2014: 3
FWCI
4.22
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by)
Funders
National Institute for Health and Care Research
Topics
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Health Sciences › Medicine › Epidemiology › Mycobacterium research and diagnosis
  • Health Sciences › Medicine › Surgery › Infectious Diseases and Tuberculosis
Keywords
Mycobacterium tuberculosis, bacterial dormancy, latent tuberculosis infection, extracellular matrix, lipoglycans, cell wall remodeling, infectivity, guinea pig infection model, nutrient depletion
MeSH terms
Adaptation, Physiological, Animals, Carbohydrates, Carbon, Cell Wall, Chromatography, Thin Layer, Electrophoresis, Polyacrylamide Gel, Extracellular Matrix, Multigene Family, Guinea Pigs, Mycobacterium Infections, Mycobacterium tuberculosis, Polysorbates, Up-Regulation, Gene Expression Regulation, Bacterial, Gene Expression Profiling, Mice, Bacterial Load, Molecular Sequence Annotation

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