ZNF574 is a quality control factor for defective ribosome biogenesis intermediates

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Eukaryotic ribosome assembly is a complex process involving rRNAs, ribosomal proteins, and numerous biogenesis factors.
• Errors in ribosome assembly can lead to non-functional intermediates that require degradation by quality control (QC) mechanisms.
• The specific factors governing the QC of ribosome assembly intermediates remain largely unknown.

Purpose of the Study:

• To investigate the mechanisms underlying the quality control of eukaryotic ribosome assembly.
• To identify the factors responsible for distinguishing functional from non-functional ribosome intermediates.
• To elucidate the role of identified QC factors in cellular and organismal health.

Main Methods:

• Engineered a system to perturb ribosome assembly in human cells.
• Utilized ubiquitin-proteasome system degradation assays.
• Identified ZNF574 as a key component of the ribosome quality control pathway.
• Investigated the impact of ZNF574 loss in an animal model.

Main Results:

• Faulty ribosome intermediates are degraded through the ubiquitin-proteasome system.
• ZNF574 was identified as a critical component of a novel ribosome quality control pathway, named the ribosome assembly surveillance pathway (RASP).
• Loss of ZNF574 in an animal model resulted in significant developmental defects.

Conclusions:

• The ribosome assembly surveillance pathway (RASP) effectively monitors and degrades aberrant ribosome intermediates.
• ZNF574 plays a vital role in RASP, ensuring proper ribosome biogenesis and cellular function.
• Dysregulation of RASP, indicated by ZNF574 deficiency, has profound implications for organismal development and health.