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Project description:Identifying mRNA Sequence Elements for Target Recognition by Human Argonaute Proteins
| PRJNA238583 | ENA
Project description:Sin3A and Sin3B bind to distinct and overlapping target sites. Sin3 proteins bind to distinct sites in cycling myoblasts whereas there is a converge of Sin3A and Sin3B proteins to sites in differentiated myotubes. We identified a subset of Sin3 target genes involved in muscle differentiation and physiology and showed that conditional ablation of Sin3 proteins in vivo in mouse results in sarcomere defects Examination of Sin3A and Sin3B binding during myogenesis
2011-01-01 | E-GEOD-22554 | biostudies-arrayexpress
Project description:Widespread microRNA degradation elements in target mRNAs can assist the encoded proteins
| PRJNA741532 | ENA
Project description:High-throughput identification of Toxoplasma gondii effector proteins that target host cell transcription
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Project description:Identification of diverse target RNAs that are functionally regulated by human Pumilio proteins
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Project description:Identification of potential target genes of KRAB zinc-finger proteins in cancer cells
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Project description:Synthetic DNA-binding proteins have found broad application in gene therapies and as tools for interrogating biology. Engineered proteins based on the CRISPR/Cas9 and TALE systems have been used to alter genomic DNA sequences, control transcription of endogenous genes, and modify epigenetic states. Although the activity of these proteins at their intended genomic target sites have been assessed, the genome-wide effects of their action have not been extensively characterized. Additionally, the role of chromatin structure in determining the binding of CRISPR/Cas9 and TALE proteins to their target sites and the regulation of nearby genes is poorly understood. Characterization of the activity these proteins using modern high-throughput genomic methods would provide valuable insight into the specificity and off-target effects of CRISPR- and TALE-based genome engineering tools. We have analyzed the genome-wide effects of TALE- and CRISPR-based transcriptional activators targeted to the promoters of two different endogenous human genes in HEK293T cells using a variety of high-throughput DNA sequencing methods. In particular, we assayed the DNA-binding specificity of these proteins and their effects on the epigenome. DNA-binding specificity was evaluated by ChIP-seq and RNA-seq was used to measure the specificity of these activators in perturbing the transcriptome. Additionally, DNase-seq was used to identify the chromatin state at target sites of the synthetic transcriptional activators and the genome-wide chromatin remodeling that occurs as a result of their action. Our results show that these genome engineering technologies are highly specific in both binding to their promoter target sites and inducing expression of downstream genes when multiple activators bind to a single promoter. Moreover, we show that these synthetic activators are able to induce the expression of silent genes in heterochromatic regions of the genome by opening regions of closed chromatin and decreasing DNA methylation. Interestingly, the transcriptional activation domain was not necessary for DNA-binding or chromatin remodeling in these regions, but was critical to inducing gene expression. This study shows that these CRISPR- and TALE-based transcriptional activators are exceptionally specific. Although we detected limited binding of off-target sites in the genome and changes to genome structure, these off-target event did not lead to any detectable changes in gene regulation. Collectively, these results underscore the potential for these technologies to make precise changes to gene expression for gene and cell therapies or fundamental studies of gene function. HEK293T cells were transfected in triplicate with plasmids expressing synthetic transcription factors. The synthetic TFs were either (a) dCas9-VP64 fusion protein and a targeting guide RNA (gRNA), or (b) a TALE-VP64 fusion protein engineered to bind to a specific target site in the genome. As a control, cells were transfected with plasmids expressing GFP. After transfection, ChIP-seq was used to identify both on-target and off-target binding sites for the synthetic TFs.
2015-04-24 | E-GEOD-57085 | biostudies-arrayexpress
Project description:Sin3A and Sin3B bind to distinct and overlapping target sites. Sin3 proteins bind to distinct sites in cycling myoblasts whereas there is a converge of Sin3A and Sin3B proteins to sites in differentiated myotubes. We identified a subset of Sin3 target genes involved in muscle differentiation and physiology and showed that conditional ablation of Sin3 proteins in vivo in mouse results in sarcomere defects
2011-01-01 | GSE22554 | GEO