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Published on: July 7, 2014
UAP56 RNA helicase is required for axis specification and cytoplasmic mRNA localization in Drosophila
1Department of Biochemistry, The University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
Abstract:
mRNA export from the nucleus requires the RNA helicase UAP56 and involves remodeling of ribonucleo-protein complexes in the nucleus. Here, we show that UAP56 is required for bulk mRNA export from the nurse cell nuclei that supply most of the material to the growing Drosophila oocyte and for the organization of chromatin in the oocyte nucleus. Loss of UAP56 function leads to patterning defects that identify uap56 as a spindle-class gene similar to the RNA helicase Vasa. UAP56 is required for the localization of gurken, bicoid and oskar mRNA as well as post-translational modification of Osk protein. By injecting grk RNA into the oocyte cytoplasm, we show that UAP56 plays a role in cytoplasmic mRNA localization. We propose that UAP56 has two independent functions in the remodeling of ribonucleo-protein complexes. The first is in the nucleus for mRNA export of most transcripts from the nucleus. The second is in the cytoplasm for remodeling the transacting factors that decorate mRNA and dictate its cytoplasmic destination.
Insights
The RNA helicase UAP56 is crucial for mRNA export from the nucleus and cytoplasmic mRNA localization in Drosophila oocytes. Loss of UAP56 function causes developmental defects by disrupting mRNA transport and organization.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- mRNA export from the nucleus is essential for gene expression.
- RNA helicases play critical roles in ribonucleoprotein complex remodeling.
- Proper mRNA localization is vital for developmental processes.
Purpose of the Study:
- To investigate the function of RNA helicase UAP56 in Drosophila oogenesis.
- To determine UAP56's role in nuclear mRNA export and cytoplasmic mRNA localization.
- To understand UAP56's contribution to oocyte patterning and development.
Main Methods:
- Functional analysis of UAP56 in Drosophila nurse cells and oocytes.
- Assessment of mRNA export and localization.
- Investigation of chromatin organization and developmental patterning.
- RNA injection experiments to study cytoplasmic mRNA localization.
Main Results:
- UAP56 is essential for bulk mRNA export from nurse cell nuclei and oocyte nucleus organization.
- Loss of UAP56 function results in patterning defects, identifying it as a spindle-class gene.
- UAP56 is required for the localization of specific mRNAs (gurken, bicoid, oskar) and Osk protein modification.
- UAP56 plays a role in cytoplasmic mRNA localization, independent of nuclear export.
Conclusions:
- UAP56 has dual functions: nuclear mRNA export and cytoplasmic mRNA localization.
- These functions involve remodeling of ribonucleoprotein complexes.
- UAP56 is critical for both mRNA transport and developmental patterning in Drosophila oocytes.
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