Divergence of transcriptional landscape occurs early in B cell activation

Trent Fowler, Alexander S. Garruss, Amalendu Ghosh, Supriyo De, Kevin G. Becker, William H. Wood, Matthew T. Weirauch, Stephen T. Smale, Bruce Aronow, Ranjan Sen, Ananda L. Roy

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Signaling via B cell receptor (BCR) and Toll-like receptors (TLRs) results in activation of B cells with distinct physiological outcomes, but transcriptional regulatory mechanisms that drive activation and distinguish these pathways remain unknown. Results: Two hours after ligand exposure RNA-seq, ChIP-seq and computational methods reveal that BCR- or TLR-mediated activation of primary resting B cells proceeds via a large set of shared and a smaller subset of distinct signal-selective transcriptional responses. BCR stimulation resulted in increased global recruitment of RNA Pol II to promoters that appear to transit slowly to downstream regions. Conversely, lipopolysaccharide (LPS) stimulation involved an enhanced RNA Pol II transition from initiating to elongating mode accompanied by greater H3K4me3 activation markings compared to BCR stimulation. These rapidly diverging transcriptomic landscapes also show distinct repressing (H3K27me3) histone signatures, mutually exclusive transcription factor binding in promoters, and unique miRNA profiles. Conclusions: Upon examination of genome-wide transcription and regulatory elements, we conclude that the B cell commitment to different activation states occurs much earlier than previously thought and involves a multi-faceted receptor-specific transcriptional landscape.

Original languageEnglish (US)
JournalEpigenetics and Chromatin
DOIs
StateAccepted/In press - May 14 2015
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology

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