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Pervasive transcription fine-tunes replication origin activity.

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Autonomously Replicating Sequences (ARSs) limit pervasive transcription by pausing RNA polymerase II (RNAPII). This interaction impacts DNA replication origin function, highlighting the importance of genomic location.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Genomics

Background:

  • RNA polymerase II (RNAPII) transcription is pervasive and can influence other DNA processes like replication.
  • Autonomously Replicating Sequences (ARSs) are key replication origins in budding yeast, typically found in intergenic regions.
  • Previous studies overlooked non-annotated transcription's role in ARS function.

Purpose of the Study:

  • To investigate the relationship between pervasive transcription and replication origin activity.
  • To understand how ARSs affect the transcription landscape.
  • To determine the impact of physiological levels of pervasive transcription on replication origin function.

Main Methods:

  • Utilized high-resolution transcription maps to analyze pervasive transcription.
  • Studied the effects of ARSs on neighboring RNAPII transcription.
  • Investigated the role of ORC complex binding and pre-replicative complex (pre-RC) formation.

Main Results:

  • ARSs were found to pause and terminate neighboring RNAPII transcription, reducing transcription within origins.
  • Quasi-symmetrical binding of the ORC complex to ARS borders and/or pre-RC formation are proposed mechanisms for transcription pausing/termination.
  • Low, physiological levels of pervasive transcription were shown to impact replication origin function.

Conclusions:

  • ARSs actively shape the transcription landscape, limiting pervasive transcription within origins.
  • The genomic location of ARSs influences their function through interactions with pervasive transcription.
  • Understanding these transcription-replication interplay dynamics is crucial for comprehending origin function and genomic stability.