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Related Experiment Video

Updated: Mar 16, 2026

Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay
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Cup regulates oskar mRNA stability during oogenesis.

Risa M Broyer1, Elena Monfort1, James E Wilhelm1

  • 1Section on Cell and Developmental Biology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0347, United States.

Developmental Biology
|August 25, 2016
PubMed
Summary

The protein Cup is crucial for embryonic development, regulating both the translation and stability of maternal messenger RNAs (mRNAs). Loss of Cup disrupts oskar mRNA localization by reducing its stability, highlighting its dual role in mRNA regulation.

Keywords:
CupDrosophilaOogenesismRNA stability

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Maternally deposited transcripts are essential for embryonic development, requiring precise regulation of their localization, translation, and stability.
  • Ribonucleoprotein (RNP) complexes, composed of various protein subunits, mediate these regulatory processes on maternal mRNAs.
  • While translational and localization regulators are known, mechanisms for stockpiling and stabilizing maternal mRNAs for early development remain less understood.

Purpose of the Study:

  • To investigate the role of the conserved protein Cup in the regulation of maternal transcripts, specifically focusing on the oskar mRNA in Drosophila.
  • To determine how Cup influences the stability and localization of maternal mRNAs during early oocyte development.

Main Methods:

  • Analysis of gene expression and protein localization in Drosophila oocytes using genetic mutations (cup mutants).
  • Examination of oskar mRNA levels and localization to the posterior pole.
  • Assessment of RNP complex transport and oocyte specification in mutant backgrounds.

Main Results:

  • Loss of Cup function in Drosophila leads to defects in the localization of oskar mRNA and associated proteins to the posterior pole of the oocyte.
  • These localization defects are not caused by issues with oocyte specification or RNP transport.
  • A significant decrease in oskar mRNA levels was observed in cup mutant egg chambers, indicating a role in transcript stability.

Conclusions:

  • Cup plays a critical role in maintaining the stability of the oskar transcript, in addition to its known function in translational repression.
  • Cup is essential for coordinating the storage of maternal transcripts in a stable form with their translational control.
  • These findings reveal a dual function for Cup in regulating maternal mRNA fate, crucial for early embryonic development.