AT rich sequence Article ChIP-Seq DNA binding Northern blotting R factor RNA sequencing RNA-Seq S. aureus SRNA SarA regulon Staphylococcus aureus antitoxin bacterial RNA bacterial gene bacterial genome bacterial virulence bacteriostasis bioinformatics chromatin immunoprecipitation sequencing consensus gel mobility shift assay gene repression genetic code genome-wide association study lethality messenger RNA nonhuman oxidative stress promoter region