Quantitative analysis of mutation and selection pressures on base composition skews in bacterial chromosomes

BMC Genomics

Table 1 Average base composition skews in CDS and RAP and TAP effects in seven phyla of bacteria*

	Actinobacteria	Chlorobi	Cyanobacteria	Deinococcus-Thermus	Firmicutes	Proteobacteria	Spirochaetes
σG _d	0.012	0.039	0.012	0.002	0.124	0.064	0.192
	± 0.036	± 0.037	± 0.019	± 0.014	± 0.073	± 0.051	± 0.079
σG _g	-0.022	-0.034	0.009	-0.012	0.027	0.004	0.001
	± 0.034	± 0.048	± 0.021	± 0.015	± 0.059	± 0.048	± 0.025
σG ^T	(-0.005)	(0.002)	0.010	(-0.005)	0.075	0.034	0.096
	± 0.030	± 0.043	± 0.020	± 0.012	± 0.059	± 0.046	± 0.035
σG ^R	0.017	0.037	(0.001)	0.007	0.049	0.030	0.096
	± 0.018	± 0.005	± 0.001	± 0.008	± 0.032	± 0.019	± 0.047
σA _d	-0.011	-0.010	-0.011	-0.011	0.070	0.005	-0.016
	± 0.036	± 0.008	± 0.026	± 0.035	± 0.036	± 0.034	± 0.051
σA _g	0.012	0.077	-0.011	0.025	0.063	0.035	0.133
	± 0.017	± 0.053	± 0.028	± 0.031	± 0.034	± 0.032	± 0.091
σA ^T	(0.001)	0.033	-0.011	0.007	0.067	0.020	0.058
	± 0.018	± 0.029	± 0.027	± 0.032	± 0.031	± 0.030	± 0.056
σA ^R	-0.012	-0.043	(-0.000)	-0.018	(0.004)	-0.015	-0.075
	± 0.022	± 0.024	± 0.001	± 0.006	± 0.016	± 0.013	± 0.047

*Standard deviations are listed below the averages. Absolute values of σG^T, σG^R, σA^T, and σA^Requal to or smaller than 0.005 are in parentheses.

ISSN: 1471-2164