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A Genome-wide mRNA Screen and Functional Analysis Reveal FOXO3 as a Candidate Gene for Chicken Growth

ABSTRACT: The objective of this study was to identify candidate genes associated with chicken growth and investigate their potential mechanisms. We used RNA-Seq to study the breast muscle transcriptome in high and low tails of Recessive White Rock (WRRh, WRRl) and Xinghua chickens (XHh, XHl). A total of 60, 23, 153 and 359 differentially expressed genes were detected in WRRh vs. WRRl, XHh vs. XHl, WRRh vs. XHh and WRRl vs. XHl, respectively. GO, KEGG pathway and gene network analyses showed that CEBPB, FBXO32, FOXO3 and MYOD1 played key roles in growth. The functions of FBXO32 and FOXO3 were validated.

ORGANISM(S): Gallus gallus

PROVIDER: GSE72424 | GEO | 2015/08/27

SECONDARY ACCESSION(S): PRJNA294010

REPOSITORIES: GEO

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A Genome-wide mRNA Screen and Functional Analysis Reveal FOXO3 as a Candidate Gene for Chicken Growth

Project description:The objective of this study was to identify candidate genes associated with chicken growth and investigate their potential mechanisms. We used RNA-Seq to study the breast muscle transcriptome in high and low tails of Recessive White Rock (WRRh, WRRl) and Xinghua chickens (XHh, XHl). A total of 60, 23, 153 and 359 differentially expressed genes were detected in WRRh vs. WRRl, XHh vs. XHl, WRRh vs. XHh and WRRl vs. XHl, respectively. GO, KEGG pathway and gene network analyses showed that CEBPB, FBXO32, FOXO3 and MYOD1 played key roles in growth. The functions of FBXO32 and FOXO3 were validated. Examination of mRNA profiles in two-tail samples of WRR and XH strains.

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FOXO3 regulates gene expression from distal enhancers

Project description:FOXO transcription factors are key players in diverse cellular responses affecting tumorigenesis, stem cell maintenance and lifespan. To gain insight into mechanisms of FOXO regulated gene expression, we studied genome-wide effects of FOXO3 activation. Profiling RNA polymerase II (RNAPII) changes shows FOXO3 regulates gene expression through transcription initiation. Correlative analysis of FOXO3 and RNAPII ChIP-seq profiles demonstrates FOXO3 to act as a transcriptional activator. Furthermore, this analysis reveals a significant part of FOXO3 gene regulation proceeds through enhancer regions. FOXO3 binds to and activates enhancers as shown by the presence of and changes in enhancer-specific histone modifications and RNAPII occupancy. In addition, FOXO3-mediated enhancer regulation correlates with regulation of adjacent genes and existence of chromatin loops between FOXO3 bound enhancers and regulated genes. Combined, our data elucidate how FOXOs regulate gene transcription and provide insight into mechanisms by which FOXOs can induce different gene expression programs depending on chromatin architecture. seven 4C view point were analyzed on DLD1 colon carcinoma cells containing 4OH-Tamoxifen inducible FOXO3A3-ER (DL23 cells, Kops et al., 2002, Mol Cell Biol), to investigate 3D topology around FOXO3 bound regions and FOXO3 regulated genes before and 4 hours after addition of tamoxifen. 4C procedure, as published before (Splinter et al., 2001, Genes Dev). Cells are cross linked using 1% formaldehyde for 10min at room temperature, nuclei are isolated, after which chromatin is digested with DpnII and subsequently ligated under diluted conditions. After reversal of the cross links the DNA is purified and treated with the second restriction enzyme treatment (Csp). After a second re-ligation step the sample is purified and ligated fragments are analyzed by inverse PCR.

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