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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Rev+Microbiol
2015 ; 13
(11
): 722-36
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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 SJ
; Charpentier E
; Haft DH
; Horvath P
; Moineau S
; Mojica FJ
; 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
PMID26411297
show 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.