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Annotation and Classification of CRISPR-Cas Systems

  • Protocol
CRISPR

Part of the book series: Methods in Molecular Biology ((MIMB,volume 1311))

Abstract

The clustered regularly interspaced short palindromic repeats (CRISPR)-Cas (CRISPR-associated proteins) is a prokaryotic adaptive immune system that is represented in most archaea and many bacteria. Among the currently known prokaryotic defense systems, the CRISPR-Cas genomic loci show unprecedented complexity and diversity. Classification of CRISPR-Cas variants that would capture their evolutionary relationships to the maximum possible extent is essential for comparative genomic and functional characterization of this theoretically and practically important system of adaptive immunity. To this end, a multipronged approach has been developed that combines phylogenetic analysis of the conserved Cas proteins with comparison of gene repertoires and arrangements in CRISPR-Cas loci. This approach led to the current classification of CRISPR-Cas systems into three distinct types and ten subtypes for each of which signature genes have been identified. Comparative genomic analysis of the CRISPR-Cas systems in new archaeal and bacterial genomes performed over the 3 years elapsed since the development of this classification makes it clear that new types and subtypes of CRISPR-Cas need to be introduced. Moreover, this classification system captures only part of the complexity of CRISPR-Cas organization and evolution, due to the intrinsic modularity and evolutionary mobility of these immunity systems, resulting in numerous recombinant variants. Moreover, most of the cas genes evolve rapidly, complicating the family assignment for many Cas proteins and the use of family profiles for the recognition of CRISPR-Cas subtype signatures. Further progress in the comparative analysis of CRISPR-Cas systems requires integration of the most sensitive sequence comparison tools, protein structure comparison, and refined approaches for comparison of gene neighborhoods.

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Authors and Affiliations

  1. National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, MD, 20894, USA

    Kira S. Makarova & Eugene V. Koonin

Authors
  1. Kira S. Makarova
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  2. Eugene V. Koonin
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Corresponding author

Correspondence to Kira S. Makarova .

Editor information

Editors and Affiliations

  1. Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden

    Magnus Lundgren

  2. Department of Molecular Biology MIMS, Umeå University, Umeå, Sweden

    Emmanuelle Charpentier

  3. Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand

    Peter C. Fineran

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Makarova, K.S., Koonin, E.V. (2015). Annotation and Classification of CRISPR-Cas Systems. In: Lundgren, M., Charpentier, E., Fineran, P. (eds) CRISPR. Methods in Molecular Biology, vol 1311. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2687-9_4

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  • DOI: https://doi.org/10.1007/978-1-4939-2687-9_4

  • Publisher Name: Humana Press, New York, NY

  • Print ISBN: 978-1-4939-2686-2

  • Online ISBN: 978-1-4939-2687-9

  • eBook Packages: Springer Protocols

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