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Published on: January 2, 2018
Genome-wide analysis of mRNA decay patterns during early Drosophila development
Stefan Thomsen1, Simon Anders, Sarath Chandra Janga
1Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. S.Thomsen@sussex.ac.uk
Background:
The modulation of mRNA levels across tissues and time is key for the establishment and operation of the developmental programs that transform the fertilized egg into a fully formed embryo. Although the developmental mechanisms leading to differential mRNA synthesis are heavily investigated, comparatively little attention is given to the processes of mRNA degradation and how these relate to the molecular programs controlling development.
Results:
Here we combine timed collection of Drosophila embryos and unfertilized eggs with genome-wide microarray technology to determine the degradation patterns of all mRNAs present during early fruit fly development. Our work studies the kinetics of mRNA decay, the contributions of maternally and zygotically encoded factors to mRNA degradation, and the ways in which mRNA decay profiles relate to gene function, mRNA localization patterns, translation rates and protein turnover. We also detect cis-regulatory sequences enriched in transcripts with common degradation patterns and propose several proteins and microRNAs as developmental regulators of mRNA decay during early fruit fly development. Finally, we experimentally validate the effects of a subset of cis-regulatory sequences and trans-regulators in vivo.
Conclusions:
Our work advances the current understanding of the processes controlling mRNA degradation during early Drosophila development, taking us one step closer to the understanding of mRNA decay processes in all animals. Our data also provide a valuable resource for further experimental and computational studies investigating the process of mRNA decay.
Insights
mRNA degradation is crucial for embryonic development. This study reveals key mRNA decay patterns and regulators in early fruit fly development, offering insights into animal development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genomics
Background:
- mRNA levels are critical for embryonic development, yet mRNA degradation processes are understudied.
- Understanding mRNA decay is essential for comprehending developmental programs.
- Existing research heavily focuses on mRNA synthesis, neglecting degradation's role.
Purpose of the Study:
- To comprehensively map mRNA degradation patterns during early fruit fly development.
- To investigate the kinetics and regulatory factors of mRNA decay.
- To correlate mRNA decay profiles with gene function and molecular processes.
Main Methods:
- Genome-wide microarray analysis of mRNA from timed Drosophila embryos and unfertilized eggs.
- Kinetic analysis of mRNA decay rates.
- Identification of cis-regulatory sequences and trans-regulators involved in mRNA degradation.
Main Results:
- Detailed degradation patterns for all mRNAs during early fruit fly development were determined.
- Maternally and zygotically encoded factors influencing mRNA degradation were identified.
- Associations between mRNA decay, gene function, localization, translation, and protein turnover were revealed.
- Specific cis-regulatory sequences and potential protein/microRNA regulators of mRNA decay were detected.
- In vivo validation of identified cis-regulatory sequences and trans-regulators was performed.
Conclusions:
- This study significantly advances the understanding of mRNA degradation in early Drosophila development.
- The findings provide a foundational resource for future research on mRNA decay mechanisms.
- The work contributes to a broader understanding of mRNA decay processes across animal species.
