Relating gene expression data on two-component systems to functional annotations in Escherichia coli

BMC Bioinformatics

Table 6 Comparison of variance of gene expression level

Function	Variance for tail genes			Variance for group	Variance overall
	Product similarity		Subspace algorithm [30]
	Column-wise	Row-wise
cellular biosynthesis	0.028	0.023	0.018	0.025	0.027
macromolecule catabolism	0.055	0.044	not significant	0.033
carbohydrate metabolism	0.039	0.025	0.017	0.029
cellular macromolecule metabolism	0.030	0.022	0.023	0.025
macromolecule biosynthesis	0.030	0.022	0.020	0.025
biopolymer metabolism	0.030	0.023	0.018	0.025
response to desiccation	0.029	0.020	not significant	0.027
ABC transporter	not significant	0.028	not significant	0.026

Column 1: Function name from GO annotation.
Column 2: The average expression level of genes in the tail for the product-based similarity. using column-wise z-normalization.
Column 3: The average expression level of genes in the tail for the product-based similarity. using row-wise z-normalization.
Column 4: The average expression level of genes in the tail for the subspace-based similarity.
Column 5: The average expression level of genes with the function.
Column 6: The average expression level of genes in the whole data set.

ISSN: 1471-2105