Project description:Gene expression profile of the Streptococcus sanguinis transcription regulator, brpL, deletion mutant compared to the wild-type strain SK36
Project description:Transcriptional profiling of Streptococcus sanguinis nox mutant and its complemented strain compared to the wild-type SK36. Two experiments:nox mutant vs. SK36, nox complemeted strain vs. SK36. Biological replicates: triplicates, independently grown and harvested. Four replicate per array.
Project description:Gene expression profile of the Streptococcus sanguinis two component system regulator, ciaR, deletion mutant compared to the wild-type strain SK36
Project description:Gene expression profile of the Streptococcus sanguinis TetR family transcriptional regulator, brpT, deletion mutant compared to the wild-type strain SK36
Project description:Transcriptional profiling of ssa_1972-null mutant of Streptococcus sanguinis compared with wild type. The ssa_1972 gene was inactivated in Streptococcus sanguinis SK36 and transcriptional profile was compared with wild type SK36. More information can be found at http://www.people.vcu.edu/~pingxu
Project description:Transcriptional profiling of ssa_1972-null mutant of Streptococcus sanguinis compared with wild type. The ssa_1972 gene was inactivated in Streptococcus sanguinis SK36 and transcriptional profile was compared with wild type SK36. More information can be found at http://www.people.vcu.edu/~pingxu One-condition experiment, M-NM-^Tssa_1972 vs S. sanguinis SK36 cells. Biological replicates: 3 wild type, 3 M-NM-^Tssa_1972, independently grown and harvested. One replicate (one wild type and one M-NM-^Tssa_1972 mixture) per array.
Project description:Gene expression profile of the Streptococcus sanguinis SK36 exposed to heat (43 C) for three time periods compared to the untreated strain SK36.
Project description:Streptococcus sanguinis is a major component of the oral flora and an important cause of infective endocarditis. The genome sequence of S. sanguinis strain SK36 was recently determined. A number of foreign genes acquired by natural transformation were detected, as well as orthologs of competence genes previously identified in other species. However, significant differences in the S. sanguinis competence system relative to that of other streptococci were noted. We sought to examine S. sanguinis genetic competence, to characterize the global transcriptional response to competence induction, and to compare our results with those obtained from previous analyses of other streptococci. A mutant possessing an in-frame deletion in the comC gene encoding the competence-stimulating peptide was created and confirmed to have the expected phenotype. Studies indicated that competence could be induced in this strain by addition of competence-stimulating peptide, and determined the optimal conditions to employ for this purpose. Expression was monitored by microarray analysis at multiple time points from 2.5 to 30 min after induction. Over 200 genes were identified whose expression was altered at least two-fold in at least one time point, with the majority upregulated. The M-bM-^@M-^\lateM-bM-^@M-^] response was typical of that seen in previous studies. However, comparison of the M-bM-^@M-^\earlyM-bM-^@M-^] response in S. sanguinis with that of other streptococci revealed unexpected heterogeneity with regard to the number of genes induced, the nature of these genes, and their putative upstream regulatory sequences. S. sanguinis possesses a comparatively limited early response, which may define a minimal competence regulatory circuit. Transcriptional analysis of S. sanguinis strain JFP41 cells 0 to 30 min after treatment with CSP. Biological replicates: 3 replicates each independently grown and harvested. 4 technical replicates per array
