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Homo sapiens

ABSTRACT: Identification of diverse target RNAs that are functionally regulated by human Pumilio proteins

PROVIDER: PRJNA377083 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5291511_1.fastq.gz	Fastqsanger.gz
	SRR5291511_2.fastq.gz	Fastqsanger.gz
	SRR5291512_1.fastq.gz	Fastqsanger.gz
	SRR5291512_2.fastq.gz	Fastqsanger.gz
	SRR5291513_1.fastq.gz	Fastqsanger.gz

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Gene expression profiles in NORAD knockout and PUMILIO overexpressing cells

Project description:Purpose: PUMILIO proteins are known to repress target genes by specifically binding to PUMILIO response elements (PREs) in target mRNAs. NORAD is a noncoding RNA that negatively regulates PUMILIO activity. The goal of this study was to determine the gene expression changes that result from knockout of NORAD or overexpression of PUMILIO and to test whether NORAD knockout causes PUMILIO hyperactivity. Methods: RNA-seq libraries were prepared using the TruSeq Stranded Total RNA with Ribo-Zero Human/Mouse/Rat Sample Preparation kit (Illumina) and sequenced using the 100 bp paired-end protocol on an Illumina HiSeq 2000. For comparing NORAD+/+ and NORAD-/- HCT116 cells, 3 biological replicates per genotype were sequenced. For PUM overexpression experiments, 3 replicates of GFP-expressing HCT116 cells (negative control) and 2 independent PUM1- or PUM2-overexpressing clones (2 replicates each) were sequenced. Results: Gene expression profiles show that PUMILIO target genes are downregulated in both NORAD knockout cells and PUMILIO overexpressing cells. Conclusions: These data indicate that NORAD sequesters PUMILIO, preventing excessive repression of PUMILIO target genes that are important for maintaining genomic stability.

2015-12-03 | GSE75440 | GEO

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Project description:In this study, we identified the transcriptome-wide direct RNA target sites of the entire family of Pumilio proteins in the budding yeast Saccharomyces cerevisiae by deep sequencing of RNA regions bound by each of six Pumilio proteins. As a family, the Pumilio proteins of yeast interact with over half of the entire transcriptome. Computational analysis of Pumilio target sites reveal striking differences in mRNA stability, gene set categories, and response to nutrient deprivation conditions based on features of Pumilio binding. Some of these features include variations in primary sequence motif and presence of predicted structured RNA hairpins. Puf6p also binds snoRNAs.

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Structural features within the NORAD long noncoding RNA underlie efficient repression of Pumilio activity

Project description:It is increasingly appreciated that long non-coding RNAs (lncRNAs) carry out important functions in mammalian cells, but how these are encoded in their sequences, and manifested in their structures remains largely unknown. Some lncRNAs bind to and modulate the availability of RNA binding proteins, but the structural principles that underlie this mode of regulation are underexplored. Here, we focused on the NORAD lncRNA, which binds Pumilio proteins and modulates their ability to repress hundreds of mRNA targets. We probed the RNA structure and long-range RNA-RNA interactions formed by NORAD inside cells, under different stressful conditions. We discovered that NORAD structure is highly modular, and consists of well-defined domains that contribute independently to NORAD function. The structure adopted by NORAD spatially clusters the Pumilio binding sites along NORAD in a manner that contributes to de-repression of Pumilio target proteins. Following arsenite stress, the majority of NORAD structure undergoes relaxation and forms inter-molecular interactions with RNAs that are targeted to stress granules. NORAD sequence thus dictates elaborated structural domain organisation that facilitates its function on multiple levels, and which helps explain the extensive evolutionary sequence conservation of NORAD regions that are not predicted to directly bind Pumilio proteins.

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