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Bacterial Autoimmunity Due to a Restriction-Modification System.

Maroš Pleška1, Long Qian2, Reiko Okura3

  • 1Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria.

Current Biology : CB
|January 26, 2016
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Summary
This summary is machine-generated.

Restriction-modification systems protect prokaryotes from foreign DNA. This study reveals that these systems can imperfectly cleave self-DNA, a process influenced by molecular noise and impacting genome evolution.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Restriction-modification (RM) systems are crucial for prokaryotic self/non-self DNA discrimination.
  • They involve methyltransferases (M) and restriction endonucleases (R) to protect against exogenous DNA.
  • Underrepresentation of restriction sites suggests imperfect discrimination and potential self-DNA cleavage.

Purpose of the Study:

  • To quantify self-restriction by RM systems in Escherichia coli.
  • To investigate the cause, frequency, and outcomes of self-DNA cleavage by RM systems.
  • To determine the relationship between RM system efficiency and self-restriction rates.

Main Methods:

  • Quantification of self-restriction rates for EcoRI and EcoRV RM systems in E. coli.
  • Analysis of the stochastic nature of self-restriction and its effect on cellular processes.
  • Correlation of RM system restriction efficiency and R/M balance with self-restriction rates.

Main Results:

  • EcoRI, unlike EcoRV, cleaves self-DNA at a measurable rate, aligning with restriction site avoidance.
  • Self-restriction is a stochastic process inducing the SOS response, followed by DNA repair and maintaining cell viability.
  • Higher RM system efficiency against phages correlates with increased self-restriction, further amplified by R/M imbalance.

Conclusions:

  • Molecular noise in RM systems contributes to self-DNA cleavage.
  • Self-restriction is a measurable phenomenon impacting prokaryotic genome dynamics.
  • RM systems' efficiency and internal stochasticity are key factors influencing self-restriction and genome shaping.