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

BMC Bioinformatics

Table 1 Distribution of cas1-cas2 genes pair together with CRISPR in three CRISPR-Cas system types

CRISPR	Nearby cas1-cas2	Remote cas1-cas2^a	Type I	Type II	Type III
+	+		1651	368	187
	-	+	36	0	66
	-	-	51	0	27
-^b	+		87	109	11
	-	+	52	0	84
	-	-	124	0	14

^aFor each CRISPR, we only checked for the presence of remote cas1-cas2 gene pair when no cas1-cas2 gene pair is found in the neighborhood of the CRISPR
^bWhen lacking the CRISPRs, we examined the cas locus containing a nearby or remote cas1-cas2 gene pair. In this table, "+" indicates presence, "-" indicates absence, and a blank cell means the corresponding aspect was not checked

ISSN: 1471-2105