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Poly(A)+ RNA during vegetative development of Acetabularia peniculus.
1Department of Biology, Faculty of Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan. mine@cc.kochi-u.ac.jp
Protoplasma
|December 6, 2001
Summary
Giant algae store messenger RNA (mRNA) in distinct structures along actin filaments. This research reveals a novel mechanism for mRNA transport and storage in the growing apex of Acetabularia.
Area of Science:
- Cell Biology
- Molecular Biology
- Algal Research
Background:
- Giant-celled algae Acetabularia spp. possess a stalk and rhizoid, with mRNA supplied from the nucleus in the rhizoid to the stalk apex.
- Previous studies indicated continuous mRNA supply and accumulation in the stalk apex of Acetabularia.
Purpose of the Study:
- To investigate the localization of polyadenylated RNA (poly(A)+ RNA) in the juvenile stage of Acetabularia peniculus.
- To understand the transport and storage mechanisms of mRNA in Acetabularia.
Main Methods:
- Fluorescent in situ hybridization using oligo(dT) as a probe to detect poly(A)+ RNA.
- Observation of poly(A)+ RNA distribution in the stalk and rhizoid cytoplasm.
- Investigation of the association between poly(A)+ RNA and actin cytoskeleton using Cytochalasin D.
Main Results:
- Poly(A)+ RNA was localized in the apical cytoplasm and as longitudinal striations throughout the stalk and rhizoid cytoplasm.
- These striations exhibited structural polarity and were associated with longitudinal actin bundles.
- Cytochalasin D disrupted actin bundles, leading to irregular poly(A)+ RNA distribution.
Conclusions:
- Poly(A)+ RNA striations represent a novel form of packaged mRNA.
- This packaged mRNA is transported along the actin cytoskeleton for storage and expression in the growing apex.
- The findings reveal a previously unknown mechanism for long-distance mRNA transport in Acetabularia.