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Related Concept Videos

Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Analyzing and Building Nucleic Acid Structures with 3DNA
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Published on: April 26, 2013

Stem-loop structures in prokaryotic genomes.

Mauro Petrillo1, Giustina Silvestro, Pier Paolo Di Nocera

  • 1CEINGE Biotecnologie Avanzate scarl Via Comunale Margherita 482, 80145 Napoli, Italy. petrillo@ceinge.unina.it

BMC Genomics
|July 6, 2006
PubMed
Summary
This summary is machine-generated.

Bacterial genomes contain more stable stem-loop structures (SLSs) than expected by chance. These RNA structures are non-randomly distributed and may regulate gene expression by influencing mRNA stability or transcription termination.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Bacterial genome secondary structures, particularly in untranslated mRNA regions, are crucial for gene expression regulation.
  • Stem-loop structures (SLSs) are key components of complex RNA secondary structures.

Purpose of the Study:

  • To systematically analyze the distribution and characteristics of SLSs across 40 bacterial genomes.
  • To identify non-randomly distributed SLSs and investigate their potential roles in gene regulation.

Main Methods:

  • Searched for SLSs with stems ≥12 bp and loops 5-100 nt, allowing G-U pairing.
  • Analyzed SLS distribution within protein-coding and intergenic regions.
  • Compared observed SLSs with random sequence models.

Main Results:

  • Bacterial genomes harbor more numerous and stable SLSs than predicted by random chance.
  • Enrichment of highly stable, non-random SLSs was observed in intergenic regions.
  • Specific SLSs in low-GC Firmicutes resemble transcriptional terminators with unique features.
  • SLSs are biased towards the 3'-end of flanking coding sequences in intergenic regions.
  • Novel repeated sequence families associated with intergenic SLSs were identified.

Conclusions:

  • Non-random SLS populations are present in all analyzed bacterial species.
  • These SLSs are likely transcribed and may regulate transcription termination or mRNA stability/turnover.
  • Three novel repeated sequence families were discovered in specific bacterial genera.