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4sU metabolic labeled transcripts in mESCs

ABSTRACT: 4sU metabolic labeled transcripts in mESCs

PROVIDER: PRJNA438673 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6847850.fastq.gz	Fastqsanger.gz
	SRR6847851.fastq.gz	Fastqsanger.gz
	SRR6847852.fastq.gz	Fastqsanger.gz
	SRR6847843.fastq.gz	Fastqsanger.gz
	SRR6847853.fastq.gz	Fastqsanger.gz

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4sU metabolic labeled transcripts in 65 YRI LCLs

Project description:Noncoding variants play a central role in the genetics of complex traits, but we still lack a full description of the main molecular pathways through which they act. Here we used molecular data to quantify the contribution of cis-acting genetic effects at each major stage of gene regulation from chromatin to proteins, within a population sample of Yoruba lymphoblastoid cell lines (LCLs). We performed 4sU metabolic labeled transcripts in 65 YRI LCLs to identify genetic variants that affect transcription rates. As expected, we found an important contribution of genetic variation via chromatin, contributing â¼65% of eQTLs (expression Quantitative Trait Loci). The remaining eQTLs, which are not asso- ciated with chromatin-level variation, are highly enriched in transcribed regions, and hence may affect expression through co- or post-transcriptional processes. International HapMap lymphoblastoid cell lines (LCLs) derived from YRI (Yoruba in Ibadan, Nigeria); We adapted the 4sU labelling method from (PMID 21516085). Briefly, cell cultures were grown to log phase in volumes sufficient to yield about 300 ng of 4sU-labeled RNA. Cells were incubated with 4sU for the required length of time (0, 30, or 60 minutes), then washed, pelleted, and frozen. Total RNA was extracted, and 4sU-labeled RNA was separated from total RNA using a bead-based biotin-streptavidin purification protocol. We sequenced metabolic labeled transcripts in 65 YRI LCLs 30 minutes and 60 minutes after incubation.

2016-03-29 | E-GEOD-75220 | biostudies-arrayexpress

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4sU metabolic labeled transcripts in mESCs

Project description:We carried out an extensive functional genomics analysis to elucidate the roles, if any, of splicing at enhancer-associated lincRNA loci (elincRNA). While we found little evidence supporting conservation of elincRNA exons, their splice sites and other splicing associated motifs accumulated significantly fewer mutations than neutrally evolving regions, suggesting that selection has acted to preserve their splicing. We showed that in contrast to other lincRNAs, not only were multi-exonic elincRNAs efficiently and rapidly spliced, they were also specifically associated with enhanced expression of proximal genes and increased local chromosomal interactions. Enrichment of chromatin signatures associated with high enhancer activity at these loci further supports the contribution of elincRNA splicing to enhancer function. Our results elucidate the previously observed evolutionary constraint at elincRNA splice sites, but not their exons, and corroborate the impact of elincRNA splicing modulation on neighboring gene expression regulation, highlighting an unexpected contribution of elincRNA splicing to enhancer function.

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