Global transcriptional responses to a long-term treatment of bile salts in Bifidobacterium longum BBMN68

Purpose：Bifidobacteria are common inhabitants of the human gastrointestinal tract. In order to colonize in the gut, it is important to adapt to the physiological concentrations of bile salts. The global response to bile in B. longum BBMN68, isolated from a healthy centenarian in the Bama County of the Guangxi Zhuang Autonomous Region in China, has been investigated through RNA-seq transcriptomics sequencing in our previous work. However, a long-term bile salts treatment is more suitable to simulate the human gastrointestinal tract environment. The goals of this study are to invstigated the global response to a long-term treatment of bile salts in B. longum BBMN68. Methods: Samples from BBMN68 cultured with or without 0.75 g liter-1 ox-bile for 24 hours were sequenced on an Illumina Hiseq platform. Three independent biological replicates were produced including 6 samples in total. Results: Raw data were firstly processed through in-house perl scripts to generate clean data, and then clean date were mapped to the reference genome, getting about 11-13 million total mapped reads per sample. mRNA from Bifidobacterium longum BBMN68, cultured in MRSc anaerobically at 37℃ with or without 0.075% oxgall for 24h, was sequnced in triplicate, using Illumina Hiseq platform