Table 4.

Essentiality of lexA for the viability of Vibrio cholerae in the presence and absence of genomic islands and prophages

Strain	Genotype	Frequency of deletion of lexA	lexA essentiality
N16961	Wild type	<1.0 × 10−10	Yes
SB31	ΔVPI-1	<1.14 × 10−9	Yes
SB27	ΔVPI-2	<1.03 × 10−9	Yes
SB25	ΔVSP-1	<2.91 × 10−9	Yes
DD2	ΔVSP-2	<2.1 × 10−9	Yes
SB50	ΔVPI-1ΔVPI-2ΔVSP-1ΔVSP-2	<4.0 × 10−9	Yes
B33	ΔTLCΔRS1	<3.92 × 10−10	Yes
SB53	ΔVPI-1ΔVPI-2ΔVSP-1ΔVSP-2 ΔTLCΔCTXΔRS1	4.93 × 10−7	No
BS1	ΔTLCΔCTXΔRS1	2.59 × 10−5	No

Frequency of lexA deletion was measured from at least two independent experiments.