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Table 2 Characterization of the “CRISPR” clusters according to the cas genes and spacer diversity

From: Not all predicted CRISPR–Cas systems are equal: isolated cas genes and classes of CRISPR like elements

% co-location

# of clusters

# of CRISPRs

cas-near

cas-far

cas genes not found in the genome

d+

d-

d+

d-

d+

d-

short

Singletons

2996

477

4

767

473

689

518

68

[0,0.1)

615

4

7

1365

587

947

614

87

[0.1,0.2)

13

34

0

216

0

11

0

0

[0.2,0.3)

24

79

3

194

0

38

0

0

[0.3,0.4)

32

85

0

142

0

13

0

0

[0.4,0.5)

19

240

0

212

0

52

0

0

[0.5,0.6)

81

202

0

145

0

34

0

0

[0.6,0.7)

37

177

0

75

0

20

0

0

[0.7,0.8)

29

884

0

205

0

66

0

0

[0.8,0.9)

21

286

0

43

0

5

0

0

[0.9,1)

11

353

0

11

0

5

0

0

1

340

1292

0

0

0

0

0

0

  1. Descriptions of the columns: “% co-location” shows the percentage of CRISPRs co-locating with cas genes in each cluster; “d+” represents that CRISPR contains diverse spacers, whereas “d-” indicates no spacer diversity was observed; “short” represents short CRISPRs (with two spacers without spacer diversity)