Unknown,Transcriptomics,Genomics,Proteomics

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Conversion of Gastric Epithelia to Endoderm Progenitors by Small Molecules [gene expression]

ABSTRACT: Forced expression of transcription factors for lineage reprogramming brings hope to cell-based therapy. However, its application is hampered by risks of potential genetic aberrations and tumorigenicity. Using defined small molecules in presence of gastric stromal cells as feeders, we reprogramed human gastric epithelia into induced multipotent endodermal progenitors (hiMEPs) with efficiency of up-to-6%. The hiMEPs expressed genes relative to endodermal lineages but not associating with pluripotency, and could be expanded clonogenically remaining as undifferentiated colonies. Upon induction, hiMEPs were able to give rise to multiple functional endodermal cell types, apart from ectodermal or mesodermal lineages. TGFÎ² inhibition and particular Wnt signaling activation were crucial in reprogramming process. Collective advantages of availability from donors without age restriction, capabilities in expansion and differentiation, and no concern of tumorigenesis, let hiMEPs have the considerable application potentials on cell therapies of diseases such as liver failure and diabetes, as well as personalized drug-screenings. Gastric epithelial cells (GECs) were isolated from human stomach. Human induced multipotent endodermal progenitors (hiMEPs) were reprogrammed from GECs by small molecules. The hiMEP-Heps were differentiated from hiMEPs under hepatic differentiation protocol. Fetal-Heps were isolated from aborted fetal liver. Definitve endoderm (DE), primitive gut tube (PGT), and posterior foregut (PFG) were endodermal stem cells derived form human enbryonic stem cells (hESCs).We used RNA sequencing and DNA methylation analysis to detail the global gene expression profile of GECs, hiMEPs, hiMEP-Heps, Fetal-Heps, DE, PGT and PFG to delineate the difference of these cells.

ORGANISM(S): Homo sapiens

SUBMITTER: Jinhua Qin

PROVIDER: E-GEOD-58557 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Hereditary Persistence of Fetal Hemoglobin (HPFH) is characterized by persistent high levels of fetal hemoglobin (HbF) in adults. Several contributory factors, both genetic and environmental, have been identified, but others remain elusive. Ten of twenty-seven members from a Maltese family presented with HPFH. A genome-wide SNP scan followed by linkage analysis revealed a candidate region on chromosome 19p13.12-13. Sequencing identified a nonsense mutation in the KLF1 gene, p.K288X, ablating the DNA binding domain of this key erythroid transcriptional regulator. Only HPFH family members were heterozygote carriers of this mutation. Expression profiling on primary erythroid progenitors revealed down-regulation of KLF1 target genes in HPFH samples. Functional assays demonstrated that, in addition to its established role in adult globin expression, KLF1 is a critical activator of the BCL11A gene, encoding a suppressor of HbF expression. These observations provide a rationale for the effects of KLF1 haploinsufficiency on HbF levels. To identify differentially expressed genes, RNA was isolated from erythroid progenitors (HEPs) cultured from peripheral blood of four HPFH (KLF1 p.K288X/wt) and four non-HPFH family members (wt/wt) and used for genome-wide expression analysis. A minimum of 1.5E6 HEPs were harvested at day12 of culture and RNA was extracted with Trizol reagent (Sigma) and purified using the RNeasy Mini Kit (Qiagen, Crawley, UK), including an on-column DNaseI digestion, according to the manufacturer’s instructions. RNA yield was determined using the 2100 Bioanalyzer (Agilent Technologies, Santa Clara, CA, USA). 8-10 micr-g of total RNA was analysed by microarrays using cells from day 12 of culture. Quality of the total RNA samples and the resulting cRNA was assessed on the Bioanalyzer. Fragmented biotinylated cRNA was prepared and 15μg hybridized to HG-U133 plus 2 GeneChips, according to the manufacturer’s protocols (Affymetrix). The data was normalized by Robust Multi-Array average (RMA) algorithm.

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Conversion of Gastric Epithelia to Endoderm Progenitors by Small Molecules [gene expression]

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