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Highly repetitive DNA sequences in cyanobacterial genomes
D Mazel1, J Houmard, A M Castets
1Centre National de la Recherche Scientifique, URA D1129, Département de Biochimie et Génétique Moléculaire, Institut Pasteur, Paris, France.
Journal of Bacteriology
|May 1, 1990
Summary
Researchers identified novel short tandemly repeated repetitive (STRR) sequences in Calothrix sp. strain PCC 7601. These repetitive DNA elements are specific to heterocystous cyanobacteria, suggesting potential roles in taxonomy and genome function.
Area of Science:
- Genomics
- Microbiology
- Molecular Biology
Background:
- Cyanobacteria possess diverse genomic structures.
- Repeated DNA sequences play various roles in genome organization and evolution.
- Understanding repetitive elements is crucial for cyanobacterial research.
Purpose of the Study:
- To characterize novel repeated sequences in Calothrix sp. strain PCC 7601.
- To investigate the distribution of these sequences across different cyanobacterial strains.
- To explore the potential taxonomic significance of these repetitive elements.
Main Methods:
- Genomic DNA extraction from various cyanobacterial strains and bacterial species.
- Southern hybridization using specific repetitive sequence probes.
- Analysis of repetitive sequence copy number and genomic location.
Main Results:
- Identification of three distinct families of short tandemly repeated repetitive (STRR) sequences.
- STRR sequences were found at approximately 100 copies per genome in Calothrix.
- These STRR sequences were specific to heterocystous cyanobacterial strains tested, including Calothrix.
- No significant hybridization was observed with Bacillus subtilis or Escherichia coli DNA.
Conclusions:
- STRR sequences represent a novel class of repetitive DNA in Calothrix.
- The specificity of STRR sequences suggests their potential as molecular markers for heterocystous cyanobacteria.
- Further research is warranted to elucidate the functional role of STRR sequences in cyanobacterial genomes.