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Updated: Feb 7, 2026

Substrate Generation for Endonucleases of CRISPR/Cas Systems
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CRISPR-Cas systems in multicellular cyanobacteria.

Shengwei Hou1, Manuel Brenes-Álvarez2, Viktoria Reimann1

  • 1a Faculty of Biology, Genetics and Experimental Bioinformatics , University of Freiburg , Freiburg , Germany.

RNA Biology
|July 12, 2018
PubMed
Summary
This summary is machine-generated.

Filamentous cyanobacteria possess numerous CRISPR-Cas systems and repeat-spacer arrays, exceeding Cas1 protein numbers. These systems are found in mobile genetic elements linked to programmed DNA excision, highlighting their unique integration and study potential.

Keywords:
CRISPRcyanobacteriaheterocystnitrogen fixationprogrammed DNA recombination

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • CRISPR-Cas systems are crucial for genome editing and gene expression.
  • Significant diversity exists in CRISPR-Cas systems across organisms.
  • Filamentous cyanobacteria exhibit a high number of CRISPR repeat-spacer cassettes but fewer cas genes.

Purpose of the Study:

  • To investigate the types and diversity of CRISPR-Cas systems in multicellular cyanobacteria.
  • To analyze CRISPR-like repeat-spacer arrays in 171 publicly available genomes.
  • To understand the relationship between CRISPR-Cas systems and mobile genetic elements in cyanobacteria.

Main Methods:

  • Genomic analysis of 171 multicellular cyanobacteria.
  • Identification and characterization of CRISPR-Cas systems and repeat-spacer arrays.
  • Analysis of gene expression patterns and integration sites.

Main Results:

  • Over 1300 repeat-spacer arrays were identified, outnumbering Cas1 proteins.
  • Anabaena sp. PCC 7120 harbors multiple CRISPR-Cas classes and orphan arrays with active expression.
  • CRISPR-Cas systems are frequently located on mobile genetic elements involved in programmed DNA recombination.

Conclusions:

  • Filamentous cyanobacteria are rich in diverse CRISPR-Cas systems and arrays.
  • The integration of CRISPR-Cas systems into mobile genetic elements is a notable phenomenon.
  • These cyanobacteria represent a valuable resource for studying CRISPR-Cas system evolution and function.