Project description:PRDM16 ChIP was perfomed in control and Prdm16 KO crypts isolated from the duodenum of 6 week old mice 3 days after inducible gene deletion
Project description:The adult intestinal epithelium is maintained by a continuous replacement of differentiated cells from stem cells. Previous studies suggest that cellular metabolic pathways regulate intestinal stem cell activity and differentiation. However, little is known about the cell-intrinsic factors that control these metabolic programs. Here, we identify the transcription factor PRDM16 as a critical regulator of intestinal metabolic programing and stem cell differentiation. Acute deletion of Prdm16 in adult mice causes severe intestinal wasting, apoptosis, and an accumulation of poorly differentiated cells in the crypt. Prdm16-deficient crypts display decreased expression levels of fatty acid oxidation (FAO) genes and reduced rates of FAO. PRDM16 binds, along with its protein partners PPARγ and PPARα, to the promoter and enhancer regions of many FAO genes. The loss of Prdm16 or inhibition of FAO impaired the transition of intestinal stem cells into transit amplifying cells. Notably, PRDM16 expression is highest in the duodenum and declines distally along the intestine. This gradient of PRDM16 expression controls the region-specific expression of the FAO program and underlies the differential reliance of region-specific stem cells on FAO. Altogether, this study establishes PRDM16 as a regional-specific regulator of metabolism and stem cell differentiation in the intestine.
Project description:The adult intestinal epithelium is maintained by a continuous replacement of differentiated cells from stem cells. Previous studies suggest that cellular metabolic pathways regulate intestinal stem cell activity and differentiation. However, little is known about the cell-intrinsic factors that control these metabolic programs. Here, we identify the transcription factor PRDM16 as a critical regulator of intestinal metabolic programing and stem cell differentiation. Acute deletion of Prdm16 in adult mice causes severe intestinal wasting, apoptosis, and an accumulation of poorly differentiated cells in the crypt. Prdm16-deficient crypts display decreased expression levels of fatty acid oxidation (FAO) genes and reduced rates of FAO. PRDM16 binds, along with its protein partners PPAR? and PPAR?, to the promoter and enhancer regions of many FAO genes. The loss of Prdm16 or inhibition of FAO impaired the transition of intestinal stem cells into transit amplifying cells. Notably, PRDM16 expression is highest in the duodenum and declines distally along the intestine. This gradient of PRDM16 expression controls the region-specific expression of the FAO program and underlies the differential reliance of region-specific stem cells on FAO. Altogether, this study establishes PRDM16 as a regional-specific regulator of metabolism and stem cell differentiation in the intestine.
Project description:Group 1 -- WT or PRDM16-KO ex vivo murine MLL-AF9 cells, and PRDM16-KO AF9 cells overexpressing either f-PRDM16 or s-PRDM16. Group 2 -- WT or total PRDM16-KO murine HSCs isolated from adult BM. Group 3 -- WT or total PRDM16-KO murine HSCs isolated from fetal liver. Group 4 -- WT or f-PRDM16-KO murine HSCs (expressing s-PRDM16 only) isolated from fetal liver.
Project description:We wanted to assess the role of a specific smooth muscle protein (MMP17) in two different intestinal compartments, the epithelium (crypts) and the smooth muscle. To do that we isolate intestinal crypts from wild-type (WT) and knockout (KO, Mmp17-/-) mice, and obtained clean strips of smooth muscle. After muscle dissociation, we obtained RNA directly from crypts and muscle, and it was used for RNA-seq. By comparing WT and KO samples we observed a higher impact in gene expression affecting crypts, even though MMP17 is only expressed in muscle. This helped us to identify altered signaling pathways in KO crypts that linked MMP17 with SMAD4 and BMP signaling.
Project description:Polycomb-mediated gene repression plays an important role in adult stem cell maintenance. We knocked out (using the inducible AhCre-LoxP system) Polycomb genes Eed and Ezh2 in the intestine for 6 weeks, after which crypts - the small intestinal stem cell zone - were harvested and RNA sequenced. We found Wnt, Notch and cell cycle pathways to be affected in Eed knockout (KO) but not Ezh2 KO crypts. Direct targets of Eed were determined by comparing this data with ChIP-sequencing. Small intestinal crypt mRNA profiles of 6 weeks-induced 12 weeks old Eed KO, Ezh2 KO and WT mice (all triplicates) as well as 10 days-induced Eed KO and WT organoids (duplicates) were generated by RNA sequencing over two runs and using IlluminaHiseq2000 and Hiseq2500.