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Mutations that perturb poly(A)-dependent maternal mRNA activation block the initiation of development
M E Lieberfarb1, T Chu, C Wreden
1Department of Pharmacology, University Medical Center at Stony Brook, NY 11794-8651, USA.
Development (Cambridge, England)
|February 1, 1996
Summary
Key developmental genes cortex and grauzone are crucial for activating maternal messenger RNAs (mRNAs) through polyadenylation, essential for initiating embryonic development in fruit flies.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Translational recruitment of maternal messenger RNAs (mRNAs) is vital for early metazoan development.
- Understanding the genetic regulation of this process is critical for deciphering developmental initiation.
Purpose of the Study:
- To identify genes regulating maternal mRNA translation and polyadenylation.
- To investigate the role of cortex and grauzone genes in early Drosophila development.
Main Methods:
- Screening of Drosophila female-sterile mutants for defects in maternal mRNA translation.
- Analysis of bicoid and Toll mRNA polyadenylation and translation in mutant embryos.
- Rescue experiments involving injection of polyadenylated mRNA.
Main Results:
- Maternal-effect mutations in cortex and grauzone impair translational activation and cytoplasmic polyadenylation of bicoid and Toll mRNAs.
- Cortex embryos exhibit shortened poly(A) tails on bicoid mRNA, preventing its translation.
- Nanos mRNA, activated independently of polyadenylation, is translated in cortex embryos, indicating specificity.
Conclusions:
- The cortex and grauzone genes are essential for the polyadenylation-dependent translational activation of specific maternal mRNAs.
- These genes identify a fundamental pathway critical for initiating embryogenesis in Drosophila.
- Defects in this pathway lead to embryonic arrest at the onset of development.