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The Microprocessor complex regulates ribosome production by clearing R-loops, ensuring protein synthesis matches cell growth. Its degradation under nutrient stress impairs erythropoiesis, mimicking ribosomopathies.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Ribosome biogenesis is crucial for cellular growth and requires coordinated synthesis of ribosomal proteins and RNAs.
  • The Microprocessor complex initiates microRNA processing and its role in ribosome biogenesis was previously unclear.

Purpose of the Study:

  • To investigate the role of the Microprocessor complex in regulating ribosome biogenesis and protein synthesis.
  • To elucidate the mechanism by which the Microprocessor complex influences ribosomal protein gene transcription.
  • To determine the impact of Microprocessor complex dysfunction on cellular processes and disease models.

Main Methods:

  • Investigated the effect of the Microprocessor complex on R-loop elimination at ribosomal protein genes.
  • Analyzed the impact of nutrient deprivation on Drosha localization, degradation, and subsequent effects on protein synthesis.
  • Utilized conditional knockout mouse models (Drosha deletion in erythroid progenitors) to study erythropoiesis and Gata1 translation.

Main Results:

  • The Microprocessor complex potentiates ribosomal protein gene transcription by resolving R-loops.
  • Nutrient deprivation leads to Drosha nuclear export and degradation by Nedd4, reducing ribosomal protein production.
  • Drosha deletion in erythroid progenitors impairs erythropoiesis and Gata1 translation, phenocopying ribosomopathies.

Conclusions:

  • The Microprocessor complex is essential for synchronizing protein synthesis with cellular growth rate.
  • Drosha-mediated regulation of ribosome biogenesis is critical for normal erythropoiesis.
  • The Microprocessor complex represents a potential therapeutic target for ribosomopathy-related anemias.