Genome evolution in major Escherichia coli O157:H7 lineages

BMC Genomics

Table 3 Genome ORF variability in 15 lineage I, four lineage I/II and 12 lineage II E. coli O157:H7 strains

Divergent¹ Strain # Group	ORFs	Phage-related genes	Phage-unrelated genes	OI, KI, SL²-related genes	OI, KI, SL²-unrelated genes (backbone)
0	4084	689	3395	1077	3007
1	662	78	584	95	567
2	190	33	157	43	147
3–6	291	79	212	90	201
7–12	161	79	82	91	70
13–18	141	98	43	97	44
19–25	136	87	49	97	39
26–29	91	30	61	52	39
30	79	22	57	50³	29
31	222	84	138	190	32
Total	1751	506	1245	615	1136

¹Indicates the number of strains lacking specific ORFs. ²OI = O-island, KI = K-island, SL = S-loop. ³These ORFs are only from K-islands.

ISSN: 1471-2164