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Effects of the HDACi SAHA on IgH transcription in B-cell splenocytes and effect of deletion of two cis-transcriptional enhancer on IgH transcription in femoral B-cells.

ABSTRACT: B-cell development is spatially and temporally regulated with the Ig heavy chain (IgH) locus as a conductor. Starting with the first steps of B-cell development, IgH DNA remodeling constantly occurs under the control of several cis-regulatory elements scattered all along the IgH locus. Their individual genomic deletion had partial or no effect on B-cell development. In this study we investigate the effect of the dual deletion of 5’Eµ and 3’RR enhancer on IgH transcription. Numerous B-cell lymphomas feature translocations linking oncogenes with the IgH locus and epigenetic drugs such as histone deacetylase inhibitors (HDACi) have been approved to treat some of them. In this study we investigated IgH locus transcription in B-cell splenocytes stimùulated with LPS and the HDACi SAHA.

ORGANISM(S): Mus musculus

PROVIDER: GSE169691 | GEO | 2021/03/27

REPOSITORIES: GEO

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Project description:Non-coding sense and antisense germline transcription within the immunoglobulin heavy chain locus precedes V(D)J recombination and has been proposed to be associated with Igh locus accessibility, although its precise role remains elusive. However, no global analysis of germline transcription throughout the Igh locus has been done. Therefore, we performed directional RNAseq, demonstrating the locations and extent of both sense and antisense transcription throughout the Igh locus. Surprisingly, the majority of antisense transcripts are localized around two PAIR elements in the distal IghV region. Importantly, long-distance loops measured by 3C are observed between these two active PAIR promoters and Eμ, the start site of Iμ germline transcription, in a lineage- and stage-specific manner, even though this antisense transcription is Eμ-independent. YY1-/- pro-B cells are greatly impaired in distal VH gene rearrangement and Igh locus compaction, and we demonstrate that YY1 deficiency greatly reduces antisense transcription and PAIR-Eμ interactions. ChIP-seq shows high level YY1 binding only at Eμ, but low levels near some antisense promoters. PAIR-Eμ interactions are not disrupted by DRB, which blocks transcription elongation without disrupting transcription factories once they are established, but the looping is reduced after heat shock treatment, which disrupts transcription factories. We propose that transcription-mediated interactions, most likely at transcription factories, initially compact the Igh locus, bringing distal VH genes close to the DJH rearrangement, which is adjacent to Eμ. Therefore, we hypothesize that one key role of non-coding germline transcription is to facilitate locus compaction, allowing distal VH genes to undergo efficient rearrangement. In order to determine the amount and location of sense and antisense non-coding RNA in the Igh locus, we prepared total RNA from CD19+ RAG1-/- pro-B cells. Samples were either pre-enriched in custom Agilent arrays, or directly sequenced. Data from one sample for each condition is included as reflected in the publication.

Dataset Information

Effects of the HDACi SAHA on IgH transcription in B-cell splenocytes and effect of deletion of two cis-transcriptional enhancer on IgH transcription in femoral B-cells.

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