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Fig. 1.

The type II system as an example of mechanism of CRISPR-Cas action-prepared on the basis of Nishimasu et al. [90] and Amitai et al. [91].
The type II system as an example of mechanism of CRISPR-Cas action-prepared on the basis of Nishimasu et al. [90] and Amitai et al. [91].

Te new classification of CRISPR-Cas systems proposed by Makarova et al., 2020

Type Subtype Genes included Bacterial species
Class 1 I I-A casl, cas2, cas3’, cas3”, cas4, cas5, cas6, cas7, cas8al, csa5 Archaeoglobus fulgidus
I-B casl, cas2, cas3, cas4, cas5, cas6, cas7, cas8bl Clostridium kluyveri
I-C casl, cas2, cas3, cas4, cas5, cas7, cas8c Bacillus halodurans
I-D casl, cas2, cas3’, cas3”, cas4, cas6, caslOd, cscl, csc2 Cyanothece sp. 8802
I-E casl, cas2, cas3, cas5, cas6, cas7, csel, cse2 Escherichia coli K-12
I-Fl casl, cas2, cas3, cas6f, csyl, csy2,csy3 Yersinia pseudo-tuberculosis
I-Fl casl, cas2, cas3, cas6f, csyl, csy2,csy3 Yersinia pseudo-tuberculosis
I-G casl, cas2,cas3, cas4, cas5, cas5, cas7, cas8u2 Geobacter sulfurreducens
III III-A casl, cas2, caslO, cas6, csm2, csm3, csm4, csm5, cms6 Staphylococcus epidermidis
III-B cas6, caslO, cmrl,cmr3, cmr4, cmr5, cmr6 Pyrococcus furiosus
III-C cmrl,cmr3, cmr4, cmr5, cmr6, caslO Methanothermobacter thermautotrophicus
III-D caslO, cas7, csxlO, csm2, csm5, alll473 Synechocystis sp.6803
III-E TPR+caspase, cas7(3), csm3, csm2, csm5, cas1, cas2, reverse transcriptase Candidatus Scalindua brodae
III-F caslO, cas5, casll, csm3 Th ermotoga lettingae
IV IV-A csf4, csf5, csfl, csf2, csf3, Th ioalkalivibrio sp. K90mix
IV-B cysH-like, csfl, casl 1, csf2, csf3 Rodococcus jostii RHA1
IV-C large subunit, cas11, csf2, cas5 Termofexia bacterium
Class 2 II II-A casl,cas2, cas9,csn2, Streptococcus thermophilus
II-B casl, cas2,cas4, cas9 Legionella pneumophila str. Paris
II-C1 casl, cas2, cas9 Neisseria lactamica, 020-06
II-C2 casl, cas2, cas4, cas9 Micrarchaeu acidiphilum ARMAN-1
V V-A casl, cas2, cas4, cpfl Francisella cf. novicida Fx1
V-Bl casl, cas2, cas4, c2cl Alicyclobacillus acidoterrestris
V-B2 casl, cas2, cas4, casl2b2 Planctomycetes bacterium RBG_13_46_10
V-C casl, c2c3 Oleiphilus sp.
V-D casl, casY, Bacterium CG09_39_24
V-E casl, cas2, cas4, casX Deltaproteobacteria bacterium
V-Fl casl, cas2, cas4, casl4a Uncultured archaeon
V-F1(V-U3) c2cl0, Bacillus thuringjensis HD-771
V-F2 casl, cas2, cas4, casl4b Uncultured archaeon
V-F3 casl, cas2, cas4, casl4c, Candidatus Micrarchaeota archaeon
V-G casl2g Hot springs metagenome
V-H casl2h Hypersaline lake sediment metagenome (JGI)
V-I casl2i Freshwater metagenome (JGI)
V-K(V-U5) c2c5, tniQ, tnsC, tnsB, Cyanothece sp. PCC8801
V-Ul c2c4 Gordonia otitidis
V-U2 c2c8 Cyanothece sp. PCC8801
V-U4 c2c9 Rothia dentocariosa M567
VI VI-A casl, cas2, c2c2 Leptotrichia shahii
VI-B1 c2c6, csx28 Previotella buccae
VI-B2 csx27, c2c6 Bergeyella zoohelcum
VI-C c2c7, Fusobacterium perfoetens
VI-D casl, cas2, casl3d, WYL Ruminococcus bicirculans
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Life Sciences, Microbiology and Virology