rRNA 5'ETS processing contributes to nucleolar organization and nuclear architecture.

Disruption of 5'ETS processing in rRNA leads to significant changes in nucleolar structure and nuclear organization, highlighting its role in maintaining cellular architecture.

• Why it matters: Understanding how nucleolar organization is preserved is crucial because it influences ribosome production and overall cell function, yet the specific contributions of rRNA processing steps are not fully known.
• What they did: The study disrupted the cleavage of the 5' external transcribed spacer (5'ETS) during rRNA processing using the SSU processome, observing effects on nucleolar dynamics, NPM1 interactions, and heterochromatin distribution.
• The result: Findings reveal that proper 5'ETS processing is essential for nucleolar compartmentalization and nuclear architecture, linking early ribosome biogenesis steps to broader cellular organization.