Project description:Microarray Tracking of transposon mutants for a H. pylori mouse colonization screen described in Baldwin DN et al. 2007, I&I, 75(2):??, doi:10.1128/IAI.01176-06. Screen in NSH57 H. pylori strain background. Original 50,000 clone transposon library was plated and patched to make 25 pools of 48 clones. Clones were infected into 4-8 C57Bl/6 mice and stomach bacteria from at least two mice were harvested at 1 week or one month. Semi-random PCR was used to amplify and label the DNA next to the transposon insertion from the input (Cy3) and output pool (Cy5) genomic DNA for each array. Two arrays were done per mouse. One array labeled from the left side of transposon (primers S, 2C) and one array labeled from the right side of the transposon (primers N3, 2C). Transposon insertions were defined by spots with signal four standard deviations above background in both arrays. We also counted insertions where two adjacent gene spots (after arranging the data in genome order) gave signal from the two different sides of the transposon (but not both).
Project description:Microarray Tracking of transposon mutants for a H. pylori mouse colonization screen described in Baldwin DN et al. 2007, I&I, 75(2):??, doi:10.1128/IAI.01176-06. Screen in NSH79 H. pylori strain background. Original 2000 clone transposon library was plated and patched to make 25 pools of 48 clones. Clones were infected into 4-8 C57Bl/6 mice and stomach bacteria from at least two mice were harvested at 1 week or one month. Semi-random PCR was used to amplify and label the DNA next to the transposon insertion from the input (Cy3) and output pool (Cy5) genomic DNA for each array. Two arrays were done per mouse. One array labeled from the left side of transposon (primers S, 2C) and one array labeled from the right side of the transposon (primers N3, 2C). Transposon insertions were defined by spots with signal four standard deviations above background in both arrays. We also counted insertions where two adjacent gene spots (after arranging the data in genome order) gave signal from the two different sides of the transposon (but not both).
Project description:To investigate the systemic impact of Tn+ tumor phenotypes, we conducted an analysis of circulating miRNAs in the serum of mice bearing Tn+- 4T1 tumors. The 4T1/Tn+ cell line was generated via CRISPR/Cas9 targeting of Cosmc, and tumors were established orthotopically in BALB/c mice. Tumor-bearing animals were monitored for primary growth and micrometastatic dissemination to the lungs, followed by serum collection at endpoint. Serum samples were pooled according to tumor Tn status (Tn+ or Tn–) for total RNA extraction, including small RNAs. Using the NanoString nCounter Mouse v1.5 miRNA assay, we profiled miRNA expression in three serum pools (two Tn+, one Tn–), followed by normalization and quality control via the nCounter Advanced Analysis Software. Expression values were normalized using geometric means of internal positive and negative controls, and only stable miRNA regions (CV < 15%) were retained for downstream analysis.
Project description:Sexual reproduction and recombination are essential for the survival of most eukaryotic populations. Until recently, the impact of these processes on the structure of bacterial populations has been largely overlooked. The advent of large-scale whole-genome sequencing and the concomitant development of molecular tools, such as microarray technology, facilitate the sensitive detection of recombination events in bacteria. These techniques are revealing that bacterial populations are comprised of isolates that show a surprisingly wide spectrum of genetic diversity at the DNA level. Our new awareness of this genetic diversity is increasing our understanding of population structures and of how these affect host?pathogen relationships. Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Keywords: Logical Set
Project description:To identify dysregulated miRNA(s) upon infection with H. pylori during different pre-malignant and malignant stages of gastric cancer in a mouse model