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Deciphering the complexity of human non-coding promoter-proximal transcriptome.

Sarah N Mapelli1,2,3, Sara Napoli1, Giuseppina Pisignano1

  • 1Tumor Biology and Experimental Therapeutics Program, Institute of Oncology Research (IOR), Università della Svizzera Italiana (USI), Bellinzona, Switzerland.

Bioinformatics (Oxford, England)
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Summary
This summary is machine-generated.

Researchers identified thousands of promoter-associated RNAs (paRNAs) in the human genome. These novel RNAs play roles in epigenetic regulation and chromatin organization, impacting gene expression and potentially human diseases.

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Area of Science:

  • * Genomics and Epigenetics
  • * Non-coding RNA Biology

Background:

  • * Long non-coding RNAs (lncRNAs) are increasingly recognized for their roles in epigenetic regulation and nuclear organization.
  • * High-throughput sequencing has detected non-coding transcription near gene promoters, but a comprehensive catalog of these promoter-associated RNAs (paRNAs) and their functions is lacking.

Purpose of the Study:

  • * To identify and characterize promoter-associated RNAs (paRNAs) in the human genome.
  • * To investigate the potential interactions of paRNAs with neighboring genes and genomic regulatory elements.
  • * To elucidate the role of paRNAs in epigenetic processes and human diseases.

Main Methods:

  • * Integration of data from multiple cell types and experimental platforms.
  • * Identification and characterization of paRNAs based on genomic location and transcriptional properties.
  • * Analysis of chromatin marks, transcriptional regulators, and epigenetic effectors at paRNA-positive promoters.

Main Results:

  • * Thousands of human paRNAs were identified, transcribed in both sense and antisense orientations, mostly non-polyadenylated and nuclear-retained.
  • * paRNA-positive promoters are enriched for transcriptional regulators, epigenetic effectors, and activating chromatin marks, exhibiting features of active promoters and enhancers.
  • * paRNAs are preferentially located at chromatin loop boundaries, suggesting a role in chromatin looping and anchor site recognition, independent of neighboring gene expression.

Conclusions:

  • * paRNAs represent a novel class of cis-regulatory molecules influencing local transcription factor recruitment, epigenetic state, and chromatin organization.
  • * This comprehensive analysis of the promoter-proximal transcriptome provides new insights into the functional roles of paRNAs in epigenetic regulation and human diseases.