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Parameters affecting plasmid stability in Bacillus subtilis.

H Leonhardt1, J C Alonso

  • 1Max-Planck-Institut für Molekulare Genetik, Berlin, F.R.G.

Gene
|July 15, 1991
PubMed
Summary
This summary is machine-generated.

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Direct and inverted nucleotide repeats (DRs and IRs) can cause deletions in Bacillus subtilis plasmids. High molecular weight (hmw) DNA accumulation, not repeats themselves, drives plasmid instability and host growth impairment.

Area of Science:

  • Molecular Biology
  • Microbial Genetics

Background:

  • Plasmid stability is crucial for genetic engineering in Bacillus subtilis.
  • Nucleotide repeat sequences within plasmids can lead to genetic instability.

Purpose of the Study:

  • To investigate the role of direct repeats (DRs) and inverted repeats (IRs) in plasmid instability in Bacillus subtilis.
  • To identify the underlying mechanisms causing selective pressure against unstable plasmids.

Main Methods:

  • Utilized a pUB110-derived shuttle plasmid engineered with DRs and IRs.
  • Analyzed plasmid deletion formation and accumulation of high molecular weight (hmw) DNA.
  • Assessed the impact of plasmid instability on host Bacillus subtilis growth.

Main Results:

Related Experiment Videos

  • Deletions up to 6 kb occurred between DRs (7-16 bp).
  • IRs (43-58 bp) stimulated deletions in adjacent regions.
  • Unstable plasmids, unlike deletion derivatives, impaired host growth and accumulated hmw DNA.

Conclusions:

  • DRs and IRs contribute to deletions but are not the sole cause of instability.
  • Accumulation of hmw DNA is proposed as the primary driver for selective pressure against unstable plasmids.
  • Host mutations and other factors can enhance recombinant plasmid stability in B. subtilis.