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Evolutionary classification of CRISPR–Cas systems: a burst of class 2 and derived variants

Research output: Contribution to journalReview article

Author(s)

Kira S. Makarova, Yuri Wolf, Jaime Iranzo, Sergey A. Shmakov, Omer S. Alkhnbashi, Stan J. J. Brouns, Emmanuelle Charpentier, David Cheng, Daniel H. Haft, Philippe Horvath, Sylvain Moineau, Francisco J. M. Mojica, David Scott, Shiraz A. Shah, Virginijus Siksnys, Michael P. Terns, Ceslovas Venclovas, Malcolm F. White, Alexander F. Yakunin, Winston Yan & 6 more Feng Zhang, Roger A. Garrett, Rolf Backofen, John van der Oost, Rodolphe Barrangou, Eugene Koonin

School/Research organisations

Abstract

The number and diversity of known CRISPR-Cas systems have substantially increased in recent years. Here, we provide an updated evolutionary classification of CRISPR-Cas systems and cas genes, with an emphasis on the major developments that have occurred since the publication of the latest classification, in 2015. The new classification includes 2 classes, 6 types and 33 subtypes, compared with 5 types and 16 subtypes in 2015. A key development is the ongoing discovery of multiple, novel class 2 CRISPR-Cas systems, which now include 3 types and 17 subtypes. A second major novelty is the discovery of numerous derived CRISPR-Cas variants, often associated with mobile genetic elements that lack the nucleases required for interference. Some of these variants are involved in RNA-guided transposition, whereas others are predicted to perform functions distinct from adaptive immunity that remain to be characterized experimentally. The third highlight is the discovery of numerous families of ancillary CRISPR-linked genes, often implicated in signal transduction. Together, these findings substantially clarify the functional diversity and evolutionary history of CRISPR-Cas.

The number and diversity of known CRISPR-Cas systems have substantially increased in recent years. In this Review, Koonin and colleagues provide an updated evolutionary classification of CRISPR-Cas systems and cas genes, with an emphasis on major developments, and outline a complete scenario for the origins and evolution of CRISPR-Cas systems.

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Details

Original languageEnglish
Pages (from-to)67-83
Number of pages17
JournalNature Reviews Microbiology
Volume18
Issue number2
DOIs
Publication statusPublished - 19 Dec 2019

    Research areas

  • ADAPTIVE IMMUNITY, DIVERSITY, BACTERIAL, ARCHAEAL, DISCOVERY, ELEMENTS, PAM

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