Project description:A bioenergetic balance between glycolysis and mitochondrial respiration is particularly important for stem cell fate specification. It however remains to be determined whether undifferentiated spermatogonia switch their preference of bioenergy production during differentiation. In this study, we found that ATP generation in spermatogonia was gradually increased upon retinoic acid-induced differentiation. To accommodate this elevated energy demand, retinoic acid signaling concomitantly switched ATP production in spermatogonia from glycolysis to mitochondrial respiration, accompanied by increased levels of reactive oxygen species. In addition, inhibition of glucose conversion to glucose-6-phosphate or pentose phosphate pathway blocked the formation of c-Kit+ differentiating germ cells, suggesting that metabolites produced from glycolysis are required for spermatogonial differentiation. We further demonstrated that the expression levels of several metabolic regulators and enzymes were significantly altered upon retinoic acid-induced differentiation by both RNA-seq analyses and quantitative proteomics. Taken together, our data unveil a critically regulated bioenergetic balance between glycolysis and mitochondrial respiration which is required for spermatogonial proliferation and differentiation.
Project description:Among its many roles in development, retinoic acid determines the anterior-posterior identity of differentiating motor neurons by activating Retinoic Acid Receptor (RAR)-mediated transcription. RAR is thought to bind the genome constitutively, and only induce transcription in the presence of the retinoid ligand. However, little is known about where RAR binds to the genome or how it selects target sites. We tested the constitutive RAR binding model using the retinoic acid-driven differentiation of mouse embryonic stem cells into differentiated motor neurons. We find that retinoic acid treatment results in widespread changes in RAR genomic binding, including novel binding to genes directly responsible for anterior-posterior specification, as well as the subsequent recruitment of the basal polymerase machinery. Finally, we discovered that the binding of transcription factors at the embryonic stem cell stage can accurately predict where in the genome RAR binds after initial differentiation. We have characterized a ligand-dependent shift in RAR genomic occupancy at the initiation of neurogenesis. Our data also suggests that enhancers active in pluripotent embryonic stem cells may be preselecting regions that will be activated by RAR during neuronal differentiation. The differentiation of ventral motor neurons is induced by treating embryonic stem cell cultures with retinoic acid. Here, ChIP-seq is used to profile the genome-wide occupancy of RAR isofroms both immediately prior to and during exposure of the cells to retinoic acid. ChIP-seq is also used to profile the genomic occupancy of Pol2 with phosphorylated serine 5 (Pol2-S5P) and phosphorylated serine 2 (Pol2-S2P) after exposure to retinoic acid.
Project description:Study of the emergence of the rare 2C like cell population upon Retinoic Acid treatment. Transcriptionally characterise the different cell populations emerging at different timepoints upon Retinoic Acid treatment and identify genes driving cell fate decisions.
Project description:Wildtype murine embryonic stem cells were kept undifferentiated or treated with retinoic acid for 4 days. We used SABioscience p53 Signaling Pathway Array to quantitate gene expression of genes involved in survival and cell death from the immature and the differently activated cells.
Project description:Among its many roles in development, retinoic acid determines the anterior-posterior identity of differentiating motor neurons by activating Retinoic Acid Receptor (RAR)-mediated transcription. RAR is thought to bind the genome constitutively, and only induce transcription in the presence of the retinoid ligand. However, little is known about where RAR binds to the genome or how it selects target sites. We tested the constitutive RAR binding model using the retinoic acid-driven differentiation of mouse embryonic stem cells into differentiated motor neurons. We find that retinoic acid treatment results in widespread changes in RAR genomic binding, including novel binding to genes directly responsible for anterior-posterior specification, as well as the subsequent recruitment of the basal polymerase machinery. Finally, we discovered that the binding of transcription factors at the embryonic stem cell stage can accurately predict where in the genome RAR binds after initial differentiation. We have characterized a ligand-dependent shift in RAR genomic occupancy at the initiation of neurogenesis. Our data also suggests that enhancers active in pluripotent embryonic stem cells may be preselecting regions that will be activated by RAR during neuronal differentiation.
Project description:The study focuses on an extensive biochemical fractionation with in-depth quantitative mass spectrometric profiling in the mitochondrial (mt) extracts of cultured human NTera2 embryonal carcinoma stem cells (i.e. ECSCs or undifferentiated state) and upon exposure to retinoic acid-induced differentiated neurons (DNs) to establish a network of high-quality mt protein-protein interactions. The resulting network showed that most of the native mt protein complexes with predicted subunits are previously unreported and endured extensive changes during neuronal differentiation and influence neuronal function and neurodegenerative disorder attributes.
Project description:The study focuses on an extensive biochemical fractionation with in-depth quantitative mass spectrometric profiling in the mitochondrial (mt) extracts of cultured human NTera2 embryonal carcinoma stem cells (i.e. ECSCs or undifferentiated state) and upon exposure to retinoic acid-induced differentiated neurons (DNs) to establish a network of high-quality mt protein-protein interactions. The resulting network showed that most of the native mt protein complexes with predicted subunits are previously unreported and endured extensive changes during neuronal differentiation and influence neuronal function and neurodegenerative disorder attributes.
Project description:The study focuses on an extensive biochemical fractionation with in-depth quantitative mass spectrometric profiling in the mitochondrial (mt) extracts of cultured human NTera2 embryonal carcinoma stem cells (i.e. ECSCs or undifferentiated state) and upon exposure to retinoic acid-induced differentiated neurons (DNs) to establish a network of high-quality mt protein-protein interactions. The resulting network showed that most of the native mt protein complexes with predicted subunits are previously unreported and endured extensive changes during neuronal differentiation and influence neuronal function and neurodegenerative disorder attributes.
Project description:The study focuses on an extensive biochemical fractionation with in-depth quantitative mass spectrometric profiling in the mitochondrial (mt) extracts of cultured human NTera2 embryonal carcinoma stem cells (i.e. ECSCs or undifferentiated state) and upon exposure to retinoic acid-induced differentiated neurons (DNs) to establish a network of high-quality mt protein-protein interactions. The resulting network showed that most of the native mt protein complexes with predicted subunits are previously unreported and endured extensive changes during neuronal differentiation and influence neuronal function and neurodegenerative disorder attributes.