Centromeric transcription maintains centromeric cohesion in human cells

Area of Science:

• Cell Biology
• Epigenetics
• Molecular Biology

Background:

• Centromeric transcription's role in centromere function is established but lacks direct manipulation evidence.
• Specific methods to alter centromeric transcription are needed to confirm its direct functional consequences.

Purpose of the Study:

• To investigate the direct role of centromeric transcription in maintaining centromeric cohesion.
• To establish a causal link between centromeric transcription levels and centromeric cohesion.

Main Methods:

• Utilized transcriptional inhibitors to selectively modulate gene and centromeric transcription in human cells.
• Monitored nascent RNA levels to assess transcription changes.
• Manipulated CENP-B expression and targeted centromeres with Kox1-KRAB to alter centromeric transcription.
• Assessed centromeric cohesion following these manipulations.

Main Results:

• Transcriptional inhibitors showed differential effects on gene versus centromeric transcription.
• Inhibitors suppressing centromeric transcription weakened cohesion; those increasing it strengthened cohesion.
• Modulating CENP-B levels altered centromeric transcription and cohesion accordingly.
• Targeting Kox1-KRAB to centromeres decreased transcription and weakened cohesion.

Conclusions:

• Centromeric transcription directly influences centromeric cohesion in human cells.
• The study provides strong evidence that centromeric transcription is a key regulator of centromeric cohesion.