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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Modular type I polyketide synthases (PKS) are known to produce diverse bacterial metabolites.
  • Polyketides have historically been isolated exclusively from aerobic bacteria, with no examples reported from strict anaerobes.
  • The genus Clostridium, comprising strict anaerobes, has not been previously investigated for PKS gene presence.

Purpose of the Study:

  • To investigate the diversity and distribution of PKS genes within the genus Clostridium.
  • To determine if anaerobic bacteria, specifically Clostridium species, possess the genetic machinery for polyketide synthesis.
  • To explore the potential of Clostridium as a source for novel bioactive polyketides.

Main Methods:

  • Comparative genomic analyses of sequenced Clostridium genomes.
  • Prediction of modular type I PKS gene clusters.
  • PCR screening for PKS genes in a selection of Clostridium species.
  • Phylogenetic analyses of identified PKS genes.
  • Reverse transcription quantitative PCR (RT-qPCR) to assess gene expression.

Main Results:

  • Pathogenic Clostridium species lack detectable PKS genes.
  • Cryptic PKS genes are widely distributed among non-pathogenic Clostridium species.
  • Phylogenetic analysis indicates unusual and diverse origins for these Clostridium PKS genes.
  • RT-qPCR confirmed that the identified PKS genes are transcriptionally silent under standard laboratory cultivation conditions.

Conclusions:

  • Non-pathogenic Clostridium species possess a cryptic and widespread repertoire of PKS genes.
  • The silent nature of these genes explains the historical oversight of polyketide production in anaerobic bacteria.
  • Clostridia represent a promising, yet previously unrecognized, source for the discovery of novel bioactive polyketides.