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Brown Adipogenic Reprogramming Induced by a Small Molecule

ABSTRACT: Transcriptome analysis of early adipogenesis induced by basal adipogenesis medium(AM) and AM+Bex for 2 days in C2C12 cells Global gene expression profiling has shown Bex induced adipogenic genes expression change

ORGANISM(S): Mus musculus

PROVIDER: GSE52364 | GEO | 2013/11/15

SECONDARY ACCESSION(S): PRJNA227500

REPOSITORIES: GEO

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Brown Adipogenic Reprogramming Induced by a Small Molecule

Project description:Transcriptome analysis of early adipogenesis induced by basal adipogenesis medium(AM) and AM+Bex for 2 days in C2C12 cells Global gene expression profiling has shown Bex induced adipogenic genes expression change We analyzed 4 samples from basal adipogenesis medium(AM) and AM+Bex(10uM) treated C2C12 cells using the Affymetrix Mouse Gene 1.0 ST platform. Array data was processed by Affymetrix Expression Console and Transcriptome Analysis Console (TAC) software.

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Project description:Enhancers play a central role in cell-type-specific gene expression and are marked by H3K4me1/2. Active enhancers are further marked by H3K27ac. However, the methyltransferases responsible for the deposition of H3K4me1/2 on enhancers remain elusive. Furthermore, the functions of these methyltransferases on enhancers and associated cell-type-specific gene expression are poorly understood. Here, we identify MLL4 (KMT2D) as a major H3K4 mono- and di-methyltransferase in mammalian cells. Using adipogenesis and myogenesis as model systems, we show that MLL4 exhibits cell-type- and differentiation-stage-specific genomic binding and is predominantly localized on enhancers. MLL4 co-localizes with lineage-determining transcription factors (TFs) on active enhancers during differentiation. Deletion of MLL4 dramatically decreases H3K4me1/2 and H3K27ac on enhancers and leads to severe defects in cell-type-specific gene expression and cell differentiation. Finally, we provide evidence that lineage-determining TFs recruit and require MLL4 to establish enhancers critical for cell-type-specific gene expression. Together, these results identify MLL4 as an H3K4 mono-/di-methyltransferase required for enhancer activation during cell differentiation. ChIP-Seq analyses of adipogenic TF (C/EBPalpha, C/EBPbeta, and PPARgamma) and Pol II profiles at D0 (day 0) and D2 (day 2) of adipogenesis in WT (MLL3-/-) and MLL4 KO (MLL3-/-;MLL4-/-) brown preadipocytes.

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Expression profiling of mouse bone marrow skeletal progenitors with osteogenic and adipogenic potential and adipogenic progenitors treated with IFNγ.

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Project description:AFF4 was discovered as a scaffold protein of Super Elongation Complex (SEC) and exhibites an essential function on osteogenesis, tumorigenesis and odontogenesis. However, the adipogenic biological functions of AFF4 need further explorations. Here, we demonstrate that knockdown of AFF4 inhibits adipogenesis in both human mesenchymal stem cells (hMSCs) and lineage-committed 3T3-L1 preadipocytes. Conditional knocking down of Aff4 in transgenic mouse presents a thin body phenotype and impeded adipogenesis. Mechanistically, we define autophagy signaling as a crucial downstream of AFF4 through the combination of RNA-seq and ChIP-seq analyses. Depletion of AFF4 mediates the transcription of crutial autophagy genes ATG5 and ATG16L1. Simultaneous overexpression of ATG5 and ATG16L1 rescues the lineage commitment of AFF4-deficient cells. Our data elucidate that AFF4 is indispensable for adipogenic differentiation and reveal a novel mechanism for adipogenesis at transcriptional level.

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Comparing the miRNA transcriptome of FAPs cultured in basal medium (BM) and adipogenic differentiation medium (ADM)

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Propagation of Adipogenic Signals through an Epigenomic Transition State

Project description:The transcriptional mechanisms by which temporary exposure to developmental signals instigates adipocyte differentiation are unknown. During early adipogenesis, we find transient enrichment of the glucocorticoid receptor (GR), CCAAT/enhancer binding protein b (CEBPb), p300, mediator subunit 1, and histone H3 acetylation near genes involved in cell proliferation, development and differentiation, including the gene encoding the master regulator of adipocyte differentiation, peroxisome proliferator activated receptor g2 (PPARg2). Occupancy and enhancer function are triggered by adipogenic signals, and diminish upon their removal. GR, which is required for adipogenesis but need not be active in the mature adipocyte, transiently functions with other enhancer proteins to propagate a new program of gene expression that includes induction of PPARg2, thereby providing a memory of the earlier adipogenic signal. Thus, the conversion of preadipocyte to adipocytes involves the formation of an epigenomic transition state that is not observed in cells at the beginning or end of the differentiation process. Genomic occupancy profiled by high throughput sequencing (ChIP-seq) from 3T3-L1 cells during differentiation for H3K9Ac, CEBPb and GR.

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