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An updated evolutionary classification of CRISPR?Cas systems #MMPMID26411297
Makarova KS; Wolf YI; Alkhnbashi OS; Costa F; Shah SA; Saunders SJ; Barrangou R; Brouns SJJ; Charpentier E; Haft DH; Horvath P; Moineau S; Mojica FJM; Terns RM; Terns MP; White MF; Yakunin AF; Garrett RA; van der Oost J; Backofen R; Koonin EV
Nat Rev Microbiol 2015[Nov]; 13 (11): 722-36 PMID26411297show ga
The evolution of CRISPR?cas loci, which encode adaptive immune systems in archaea and bacteria, involves rapid changes, in particular numerous rearrangements of the locus architecture and horizontal transfer of complete loci or individual modules. These dynamics complicate straightforward phylogenetic classification, but here we present an approach combining the analysis of signature protein families and features of the architecture of cas loci that unambiguously partitions most CRISPR?cas loci into distinct classes, types and subtypes. The new classification retains the overall structure of the previous version but is expanded to now encompass two classes, five types and 16 subtypes. The relative stability of the classification suggests that the most prevalent variants of CRISPR?Cas systems are already known. However, the existence of rare, currently unclassifiable variants implies that additional types and subtypes remain to be characterized.