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The structural code of cyanobacterial genomes.

Robert Lehmann1, Rainer Machné2, Hanspeter Herzel1

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Bacterial genomes commonly display a periodic bias in nucleotide frequency (~11 bp), often linked to DNA supercoiling.
  • This periodicity is hypothesized to influence DNA packaging, transcription, or serve as a structural code.
  • Cyanobacteria exhibit strong periodic signals, with dynamic supercoiling and transcription tied to circadian rhythms.

Purpose of the Study:

  • Investigate the origin and evolutionary significance of nucleotide periodicity in cyanobacteria.
  • Determine the specific DNA motifs responsible for the strongest periodic signals.
  • Explore the relationship between periodicity, genome structure, and gene expression in cyanobacteria.

Main Methods:

  • Comparative genomics analysis across diverse cyanobacterial species.
  • Bioinformatic identification and quantification of periodic nucleotide signals, focusing on dinucleotides.
  • Correlation analysis between periodicity, genomic features (e.g., coding regions, transposons), and gene expression data.

Main Results:

  • A minimal AT-tract motif (AT2) generates the strongest periodic signal in cyanobacteria.
  • Strong genome-wide periodicity is ancestral, lost in certain morphological transitions (baeocyte-forming, symbiotic species).
  • The signal is weaker in heterocystous and monoploid picocyanobacteria, suggesting a role in polyploid genome organization.
  • Protein-coding regions are the primary source, with bias in first and third codon positions.
  • Limited correlation with diurnal transcription but strong signals in transposons suggest roles in their lifecycle.

Conclusions:

  • The AT2 signal is an ancestral feature in cyanobacteria, with evolutionary loss linked to specific life strategies.
  • Nucleotide periodicity may function as a 'structural code' for nucleoid condensation and segregation, especially in polyploid genomes.
  • The signal's association with transposons indicates a potential role in their transcription and assembly.