Unknown,Transcriptomics,Genomics,Proteomics

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Gene expression profile analysis in the mid-gestation human intestine discloses greater immaturity of the colon as compared to ileum

ABSTRACT: The occurrence of many neonatal inflammatory intestinal diseases in preterm infants highlights the susceptibility of the immature intestine to respond inadequately to nutrient and microbes. A better understanding of the functional intestinal development is essential for the design of optimal treatments ensuring survival and growth of premature infants. The purpose of this study was to evaluate the gene expression profiles of the developing human ileum and colon at mid-gestation. Our results showed that more than 11% of the genes were differentially expressed between ileum and colon. Pathway analysis revealed an even higher level of transcriptional dissimilarity between the developing ileum and the colon including 35% of the significant cellular, molecular and physiological functions and 85% of the canonical pathways. Segment-specific/over-expressed functions in the ileum included a number of amino acid, vitamin and mineral metabolisms and lymphoid tissue structure and development reflecting the high level of maturity of the small intestine as compared to the colon in which cell cycle, cell morphology and actin cytoskeleton, integrin and ERK/MAPK signaling were the predominant functions. All together, functional clustering analysis of the differentially expressed genes revealed important functional difference between the two segments namely to an unexpected relative immaturity of the colon. Two-condition experiment: three human fetal small intestines vs. three human fetal large intestines.

ORGANISM(S): Homo sapiens

SUBMITTER: Jean-François Beaulieu

PROVIDER: E-GEOD-20983 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Human intestinal epithelial organoids (IEO) culture models are rapidly emerging as novel experimental tools to investigate fundamental aspects of intestinal epithelial (patho)physiology. Cellular source and culture protocols vary between different IEO models and reliable markers for their characterization/validation are currently limited. DNA methylation has been demonstrated to play a key role in regulating gene expression and cellular function. This epigenetic mark is comparably stable and has been shown to reflect cellular identity such as tissue origin, developmental stage and age. Our genome wide DNA methylation datasets of purified human epithelium represent a unique resource, which can be used by other researchers to validate their model systems We provide the following datasets of genome-wide DNA methylation profiling by Infinium HumanMethylation450 BeadChip: Purified intestinal epithelial cells (EpCAM+) from paediatric ileum and colon, Non-epithelial mucosal cells (EpCAM-), Whole colonic mucosal biopsies, Intestinal organoid cultures from paediatric ileum and colon, Purified intestinal epithelial cells (EpCAM+) from foetal small intestine and foetal large intestine, Intestinal organoid cultures from foetal small intestine and foetal large intestine, Intestinal organoid cultures derived from induced pluripotent stem cells. Note: Some samples in this data set were previously submitted to ArrayExpress under accession number E-MTAB-3709. They're clearly marked in the âDescriptionâ field in sample annotations. Information about batch effect during sample handling is included in the experimental variable âblockâ. Batch effect is not massive but present, so it is recommended that batch correction is carried out in data analysis. Complementary RNA-seq data on the purified cells and organoids can be found in ArrayExpress at E-MTAB-5015 ( https://www.ebi.ac.uk/arrayexpress/experiments/E-MTAB-5015/ ).

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Gene expression profile analysis in the mid-gestation human intestine discloses greater immaturity of the colon as compared to ileum

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