Project description:The ATAC histone acetyl-transferase (HAT) and the Mediator coactivator complexes regulate independent and distinct steps during transcription initiation and elongation. Here we report the identification of a new stable molecular assembly formed between the ATAC and the Mediator complex in mouse embryonic stem cells. Moreover, we identify LUZP1 as a subunit of this meta coactivator complex (MECO). Finally, we demonstrate that MECO regulates a subset of RNA polymerase II transcribed non-coding RNA genes. Our findings establish that transcription coactivator complexes can form stable sub-complexes in order to facilitate their combined actions on specific target genes. For ChIP-seq analysis, 300µg of chromatin (DNA) was incubated with GST (mock), LUZP1 and GCN5 antibodies. Retrieved purified DNA was sequenced using Illumina Genome Analyzer II following manufacturer recommendations. Illumina raw files were aligned against reference (mouse mm9) genome using the eland program allowing one mismatch. Enrichment clusters were detected using MACS (Zhang et al., 2008). The retrieved peaks were filtered (max size 1000bp, min size 100bp) and repeat masked, to establish the final binding sites lists. Peaks were annotated using the GPAT web server (Krebs et al., 2008) using ENSEMBL gene 57 database.
Project description:Accurate annotation of transcript isoforms is crucial to understand gene functions, but automated methods for reconstructing full-length transcripts from RNA sequencing (RNA-seq) data remain imprecise. We developed Bookend, a software package for transcript assembly that incorporates data from different RNA-seq techniques, with a focus on identifying and utilizing RNA 5′ and 3′ ends. Through end-guided assembly with Bookend we demonstrate that correct modeling of transcript start and end sites is essential for precise transcript assembly. Furthermore, we discovered that utilization of end-labeled reads present in full-length single-cell RNA-seq (scRNA-seq) datasets dramatically improves the precision of transcript assembly in single cells. Finally, we show that hybrid assembly across short-read, long-read, and end-capture RNA-seq datasets from Arabidopsis, as well as meta-assembly of RNA-seq from single mouse embryonic stem cells (mESCs) can produce end-to-end transcript annotations of comparable quality to reference annotations in these model organisms.
Project description:The ATAC histone acetyl-transferase (HAT) and the Mediator coactivator complexes regulate independent and distinct steps during transcription initiation and elongation. Here we report the identification of a new stable molecular assembly formed between the ATAC and the Mediator complex in mouse embryonic stem cells. Moreover, we identify LUZP1 as a subunit of this meta coactivator complex (MECO). Finally, we demonstrate that MECO regulates a subset of RNA polymerase II transcribed non-coding RNA genes. Our findings establish that transcription coactivator complexes can form stable sub-complexes in order to facilitate their combined actions on specific target genes.
Project description:We performed a meta analysis of publicly available TET1, 5mC, 5hmC and genome wide bisulfite profiling data mostly from mouse embryonic stem cells (ESC). Genome wide chromatin immunoprecipitation combined with deep sequencing (ChIP-seq) has revealed binding of the TET1 protein at CpG-island (CGI) promoters and at bivalent promoters. We show that TET1 also coincides with DNAseI hypersensitive sites (HS). Presence of TET1 at these THREE locations suggests that it may play a dual role: an active role at CpG-islands and DNAseI hypersensitive sites and a repressive role at bivalent loci. In line with the presence of TET1, significant enrichment of 5hmC but not 5mC is detected at bivalent promoters and DNaseI HS. Surprisingly, 5hmC is not detected or present at very low levels at CGI promoters notwithstanding the presence of TET1 at these loci. Our meta analysis suggest that asymmetric methylation is present at CA- and CT-repeats in the genome of some human ESC. Examination of the distribution of 5-methylcytosine and 5-hydroxymethylcytosine in the genome of mouse embryonic stem cells.