Unknown,Transcriptomics,Genomics,Proteomics

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Global expression profiling time series of early human embryonic stem cell differentiation towards the mesoderm lineage

ABSTRACT: Human pluripotent stem cells (hPSCs) is a promising cell type with capacities of self-renewal and pluripotency, and they can differentiate into in principal any cell types in the body. To fully make use of this unique cell type and develop efficient and reproducible differentiation protocols, more knowledge is needed about regulatory mechanisms and molecular pathways important to direct the differentiation towards specific functional cell types. The aim of this experiment was to study the events and regulators governing early differentiation human embryonic stem cells (hESCs) towards the mesoderm lineage. To this end, global expression profiling was performed for 11 time points on the hESC line SA121 (Takara-Clontech). Three biological replicates (A, B and C) were taken at day 0 (before differentiation) and on each day thereafter for ten days.

ORGANISM(S): Homo sapiens

SUBMITTER: Benjamin Ulfenborg

PROVIDER: E-MTAB-5219 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:In this study we have compared functional and molecular properties of highly purified murine induced pluripotent stem (iPS) cell- and embryonic stem (ES) cell-derived cardiomyocytes (CM). In order to obtain large amounts of purified CM, we have generated a transgenic murine iPS cell line, which expresses puromycin resistance protein N-acetyltransferase and EGFP under the control of the cardiomyocyte-specific α-myosin heavy chain promoter (alphaMHC-Puro-IRES-GFP, aPiG). We demonstrate that murine aPIG-iPS and aPIG-ES cells differentiate into spontaneously beating CM at comparable efficiencies. When selected with puromycin both cell types yielded more than 97% pure population of CMs. Both aPIG-iPS and aPIG-ES cell-derived CM express typical cardiac transcripts and structural proteins and possess similar sarcomeric organization. Action potential recordings revealed that iPS- and ES cell-derived CM respond to beta-adrenergic and muscarinic receptor modulation, express functional voltage-gated sodium, calcium and potassium channels and possess comparable current densities. Comparison of global gene expression profiles of CM generated from iPS and ES cells revealed that both cell types cluster close to each other but are highly distant to undifferentiated ES or iPS cells as well as unpurified iPS and ES cell-derived embryoid bodies (EB). Both iPS and ES cell-derived CMs express genes and functional categories typical for CM. They are enriched in genes involved in transcription and genes coding for structural proteins involved in cardiac muscle contraction and relaxation. They also express genes involved in heart and muscle developmental processes, ion export and ion binding processes and various metabolic processes for ATP synthesis. These CMs downregulate genes involved in immune response, cell cycle and cell division, thus demonstrating the CMs population is mitotically inactive. Most surface signaling pathways are also downregulated. Thus, a transgenic aPiG-iPS cell line can provide a robust supply of highly purified and functional CMs for future in vitro and in vivo studies. Seven different experimental groups were included into analysis: undifferentiated murine ES cells (1) and undifferentiated murine iPS cells (2), murine ES cell-derived embyroid bodies (3) and murine iPS cell-derived embryoid bodies at day 16 of differentiation (4), murine ES cell-derived cardiomyocytes (5) and murine iPS cell-derived cardiomyocytes (6) at day 16 of differentiation (they were generated by puromycin selection for 7 days prior to RNA isolation). Adult mouse tail tip fibroblasts (7) were used as a control for iPS cells. Total RNA samples were prepared from three independent biological replicates in groups 1-6. In group 7, single RNA probes were analyzed as three technical replicates.

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Global expression profiling time series of early human embryonic stem cell differentiation towards the mesoderm lineage

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