Molecular features underlying functional and structural interactions between diverse transcription regulatory elements in a chromosomal context

CIERA-seq shows that enhancer-derived dTREs activate target promoters with specificity that depends on the factors each dTRE recruits, distinguishing them from promoter-derived dTREs.

• Why it matters: Transcription regulatory elements interact, but how promoter–enhancer specificity is encoded in chromatin remains unclear, limiting mechanistic understanding of gene regulation.
• What they did: The study developed CIERA-seq, a chromatin-integrated landing-pad enhancer reporter assay, and used deaminase-based footprinting across individual fibers with distinct promoter–dTRE pairs.
• The result: Different promoter and dTRE pairs have distinct accessibility profiles, and dTREs modulate cognate promoter accessibility in a transcription factor and cofactor-dependent manner, with promoter accessibility positively associated with transcriptional activity.

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