Table 3.

Relationship between essential genes and operon position.

Species	Medium	Position in the operon													Ess-opa	Ess-genesb	Operonsc
		1	2	3	4	5	6	7	8	9	10	11	13	14
A. baylyi ADP1	Minimal	120 (65.2%)	50	7	3	3	1	0	0	0	0	0	0	0	184	348	643
B. subtilis 168	Rich	59 (58.4%)	33	7	2	0	0	0	0	0	0	0	0	0	101	206	818
B. fragilis 638R	Rich	155 (69.1%)	42	19	4	1	1	2	0	0	0	0	0	0	224	407	956
B. pseudomallei K96243	Rich	126 (55.2%)	58	21	13	6	3	0	0	0	0	0	0	1	228	403	1146
B. thailandensis S264	Rich	97 (57.4%)	47	13	8	2	1	1	0	0	0	0	0	0	169	310	1155
C. crescentus NA1000	Rich	123 (67.2%)	38	14	3	5	0	0	0	0	0	0	0	0	183	338	844
E. coli K-12	Rich	67 (52.8%)	38	7	8	5	0	1	0	0	0	1	0	0	127	232	851
F. tularensis novicida U112	Rich	94 (59.9%)	42	12	7	2	0	0	0	0	0	0	0	0	157	321	373
M. maripaludis S2	Rich	102 (62.2%)	44	13	3	1	1	0	0	0	0	0	0	0	164	351	362
M. maripaludis S2	Minimal	128 (62.7%)	56	12	5	3	0	0	0	0	0	0	0	0	204	423	362
M. tuberculosis H37Rv	Minimal	193 (59.2%)	92	24	10	4	1	0	2	0	0	0	0	0	326	582	895
M. genitalium G37	Rich	69 (82.1%)	12	1	2	0	0	0	0	0	0	0	0	0	84	343	89
M. pulmonis UAB	Rich	81 (74.3%)	21	5	2	0	0	0	0	0	0	0	0	0	109	247	175
P. gingivalis ATCC	Rich	144 (83.7%)	16	6	3	3	0	0	0	0	0	0	0	0	172	385	455
S. enterica typhimurium SL1344	Rich	75 (57.7%)	37	10	3	3	2	0	0	0	0	0	0	0	130	238	881
S. enterica typhi Ty2	Rich	76 (54.7%)	44	7	8	2	0	0	1	0	1	0	0	0	139	264	838
S. sanguinis SK36	Rich	50 (57.5%)	27	6	2	1	1	0	0	0	0	0	0	0	87	159	489

^aNumber of operons with at least one essential gene

^bNumber of polycistronic essential genes

^cTotal number of operons.