Project description:This study delineated how small intestinal resident microflora impact gene expression in Paneth cells. Keywords: functional genomics; transcriptional profiling
Project description:Commensal microbiota contribute to gut homeostasis and influence gene expression. Intestinal organoid culture closely represent intestinal epithelium and retain intestinal stem cells and dynamic recovery capabilities as well as all major cell types of the intestinal epithelium. We established organoid culture using colon crypts isolated from germ-free (GF), and gnotobiotic mice monocolonized either with the E.coli strain O6K13 (O) or Nissle 1917 strain (N). The expression profiles of these organoids were compared to the organoid culture isolated from conventionally reared (CR) mice in order to disclose genes differentially expressed in response to the change in the intestinal microflora composition.
Project description:The factors that govern the retention and abundance of specific microbial lineages within a developing intestinal microbiota remain poorly defined. Human milk oligosaccharides consumed by nursing infnats pass undigested to the distal gut where they may be consumed by microbes. We investigated the transcriptional response of Bacterides fragilis, a prominent gut resident, to the presence of HMOs. In vitro transcriptional profiles of Bacteroides fragilis obtained from biological duplicate cultures taken at middle log phase in minimal media glucose (MM-Glu) and in minimal media with human milk oligosaccharides (MM-HMO).
Project description:This data is part of a pre-publication release. For information on the proper use of pre-publication data shared by the Wellcome Trust Sanger Institute (including details of any publication moratoria), please see http://www.sanger.ac.uk/datasharing/ The human-infective whipworm Trichuris trichiura is estimated to infect up to a billion people and is responsible for considerable morbidity, especially in children of developing countries. The closely related species T. muris is a naturally occurring nematode parasite of mice that serves as a remarkably tractable model system for dissecting immune responses and host-parasite relationships. Such studies are of relevance beyond parasitology as helminths have arguably had a significant impact on the evolution of the mammalian immune system. Both Trichuris species reside in the caecum and colon of the host where they burrow their front end for feeding into the intestinal mucosa, thereby breaching the mucus barrier and allowing access of the microflora directly to the epithelium. The interplay of intestinal helminths, the bacterial microflora and the host immune system is currently a research focus in various laboratories (Bancroft et al 2012). This study will study the transcriptional responses of the intestinal mucosa (caecum) from infected and uninfected mice.
Project description:This study delineated how small intestinal resident microflora impact gene expression in Paneth cells. Experiment Overall Design: Paneth cells were isolated by laser capture microdissection from the small intestines of germ-free and conventionalized (10 day) mice. RNAs from 3 mice per group were pooled, and duplicate RNAs from each group were amplified and hybridized to Affymetrix arrays.
Project description:Illumina high-throughput sequencing was used to analyse the intestinal bacteria of these two species during different wintering periods at Shengjin Lake. We tested whether contact time enhances the trans-species spread of gut bacteria. Our results indicate that although intestinal microflora of hooded crane and the bean goose were different, direct or indirect contact in the mixed-species flock caused the spread of gut bacteria trans-species, and a very high proportion of common pathogens among these two hosts.
