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Where does bacterial replication start? Rules for predicting the oriC region.

Pawel Mackiewicz1, Jolanta Zakrzewska-Czerwinska, Anna Zawilak

  • 1Department of Genomics, Institute of Genetics and Microbiology, University of Wrocław, Przybyszewskiego 63/77, 51-148 Wrocław, Poland.

Nucleic Acids Research
|July 20, 2004
PubMed
Summary
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Identifying bacterial replication origins (oriC) using DNA asymmetry, DnaA box distribution, and dnaA gene location is most effective when methods are combined. Some bacteria, especially intracellular parasites, lack typical oriC features.

Area of Science:

  • Genomics and Molecular Biology
  • Bacterial Chromosome Organization
  • Replication Initiation Mechanisms

Background:

  • Bacterial replication origins (oriC) are crucial for cell division and genome stability.
  • Identifying oriC relies on specific genomic features, including DNA asymmetry and DnaA box distribution.
  • The dnaA gene plays a central role in initiating DNA replication.

Purpose of the Study:

  • To identify putative replication origins (oriC) in 120 bacterial chromosomes using three distinct methods.
  • To evaluate the agreement and applicability of DNA asymmetry, DnaA box distribution, and dnaA gene location for oriC identification.
  • To analyze the organization of DnaA box clusters and their relationship with replication origins.

Main Methods:

  • Application of three methods: DNA asymmetry analysis, DnaA box distribution mapping, and dnaA gene localization.

Related Experiment Videos

  • Classification of chromosomes based on the concordance of the three methods.
  • Detailed analysis of DnaA box cluster organization in proximity to identified putative origins.

    • Main Results:

    • DNA asymmetry emerged as the most universal method for putative oriC identification, but requires complementary methods for enhanced prediction accuracy.
    • Consistent identification of putative origins was observed across diverse bacterial phyla (e.g., Bacilli, Clostridia, Actinobacteria, gamma Proteobacteria).
    • Overrepresentation and clustering of DnaA boxes near oriC were common, suggesting regulatory roles in replication initiation.
    • Absence of typical oriC features (DnaA box clusters, dnaA gene, asymmetry switch) was noted in some intracellular parasites and endosymbionts.

    Conclusions:

    • Combining DNA asymmetry, DnaA box distribution, and dnaA gene location provides a robust approach for identifying bacterial replication origins.
    • The identified oriC features and DnaA box organization are conserved in many bacterial groups.
    • Deviations from typical oriC structures in certain bacteria are likely linked to unique evolutionary pressures and genome maintenance strategies.