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Related Experiment Video

Updated: Nov 12, 2025

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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POINT technology illuminates the processing of polymerase-associated intact nascent transcripts.

Rui Sousa-Luís1, Gwendal Dujardin2, Inna Zukher2

  • 1Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Av. Professor Egas Moniz, 1649-028 Lisbon, Portugal.

Molecular Cell
|March 18, 2021
PubMed
Summary
This summary is machine-generated.

We developed polymerase intact nascent transcript (POINT) technology to study RNA processing during transcription. POINT reveals how RNA cleavage and splicing influence transcription termination.

Keywords:
CPSF73POINT technologyPladienolide BRNA cleavageRNA polymerase IIXrn2co-transcriptional processingintact nascent RNApremature transcription terminationsplicing kinetics

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Mammalian chromatin hosts RNA polymerase II (Pol II) transcription and coupled RNA processing.
  • The molecular mechanisms of co-transcriptional RNA processing are not fully understood due to challenges in purifying nascent transcripts.

Purpose of the Study:

  • To introduce a novel technology, polymerase intact nascent transcript (POINT) technology, for characterizing nascent RNA.
  • To elucidate the kinetics and regulation of co-transcriptional RNA processing and its link to transcription termination.

Main Methods:

  • Development of a three-pronged methodology: POINT-5 for mapping nascent RNA 5' ends, POINT-nano for co-transcriptional splicing kinetics, and POINT-seq for profiling transcription units.
  • Utilizing Xrn2 depletion to investigate the role of nuclear exonuclease activity in RNA processing at polyadenylation sites.

Main Results:

  • POINT technology enables detailed characterization of nascent RNA.
  • Xrn2 selectively acts on cleaved 5' P-RNA at polyadenylation sites.
  • Co-transcriptional splicing occurs either immediately post-transcription or is delayed.
  • RNA cleavage and splicing are linked to premature or full-length transcript termination.

Conclusions:

  • POINT technology provides a powerful tool to dissect co-transcriptional RNA processing.
  • The study reveals dynamic interplay between RNA processing, cleavage, and transcription termination.
  • Understanding these co-transcriptional events is crucial for comprehending gene expression regulation.