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Poly(A)+ RNA and cytoskeleton during cyst formation in the cap ray of Acetabularia peniculus

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Summary.

The configuration and distribution of polyadenylated RNA (poly(A)+ RNA) during cyst formation in the cap rays of Acetabularia peniculus were demonstrated by fluorescence in situ hybridization using oligo(dT) as a probe, and the spatial and functional relationships between poly(A)+ RNA and microtubules or actin filaments were examined by immunofluorescence microscopy and cytoskeletal inhibitor treatment. Poly(A)+ RNA striations were present in the cytoplasm of early cap rays and associated with longitudinal actin bundles. Cytochalasin D destroyed the actin filaments and caused a dispersal of the striations. Poly(A)+ RNA striations occurred in the cytoplasm of the cap rays up to the stage when secondary nuclei migrated into the cap rays, but they disappeared after the secondary nuclei were settled in their positions. At that time, a mass of poly(A)+ RNA was present around each of the secondary nuclei and accumulated rRNA. This mass colocalized with microtubules radiating from the surface of each secondary nucleus and disappeared when the microtubules were depolymerized by butamifos, which did not affect the configuration of actin filaments. These masses of poly(A)+ RNA continued to exist even after the cap ray cytoplasm divided into cyst domains. Thus two distinct forms of poly(A)+ RNA population, striations and masses, appear in turn at consecutive stages of cyst formation and are associated with distinct cytoskeletal elements, actin filaments and microtubules, respectively.

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Abbreviations

DAPI:

4′,6-diamidino-2-phenylindole

FISH:

fluorescence in situ hybridization

FITC:

fluorescein isothiocyanate

IIF:

indirect immunofluorescence

poly(A)+ RNA:

polyadenylated RNA

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Authors and Affiliations

  1. Graduate School of Kuroshio Science, Kochi University, Kochi

    I. Mine, Y. Anota & K. Okuda

  2. Abteilung Zellbiologie der Pflanzen, Institut für Zelluläre und Molekulare Botanik, Rheinische Friedrich-Wilhelms-Universität, Bonn

    D. Menzel

Authors
  1. I. Mine
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  2. Y. Anota
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  3. D. Menzel
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  4. K. Okuda
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Correspondence to I. Mine.

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Correspondence and reprints: Graduate School of Kuroshio Science, Kochi University, 2-5-1 Akebono-cho, Kochi 780-8520, Japan.

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Mine, I., Anota, Y., Menzel, D. et al. Poly(A)+ RNA and cytoskeleton during cyst formation in the cap ray of Acetabularia peniculus. Protoplasma 226, 199–206 (2005). https://doi.org/10.1007/s00709-005-0098-2

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