RNA-seq of gastric biopsies from subjects at different stages of gastric inflammation and histological changes.

In this study we performed RNA-seq analysis of gastric corpus biopsies to study transcriptional changes during early gastric carcinogenesis. We included patients with non-atrophic gastritis, with intermediate and extensive corpus atrophy, and patients with intestinal metaplasia. We also included a control group of H. pylori-negative subjects. All subjects were from Nicaragua, which has a population of high gastric cancer risk. Total RNA samples were treated with RiboZero Magnetic (Human/Mouse/Rat) Kit (Epicentre Biotechnologies) to deplete rRNA and the cDNA libraries were prepared using ScriptSeqTM v2 RNA-Seq Library Preparation Kit (Epicentre). Sequencing was performed on the Illumina HiScan2500 platform, 2*100bp reads.