Asymmetrical Distribution of Mitochondrial rRNA into Small Micromeres of Sea Urchin Embryos(Developmental Biology)

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概要

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• Blastomeres of the 16-cell stage embryos of the sea urchin, Hemicentrotus pulcherrimus, were separated by an elutriator. By differential display, several RNA species that are enriched in micromeres are detected and their cDNA was cloned. One of the cloned cDNA encodes mt 12S rRNA. cDNA for mt 16S rRNA was also cloned from the cDNA library of unfertilized eggs. Two mt rRNAs contain poly(A) tails in their 3' ends. Both mt rRNAs distribute asymmetrically along a vegetal-animal axis of the 16-cell embryos and are enriched in micromeres, and this is also confirmed by whole mount in situ hybridization as well as electron microscopic in situ hybridization. As development proceeds, these mt rRNAs become more enriched in small micromeres. Results of electron microscopical in situ hybridization reveal both mt rRNAs localize extramitochondrially. Though at present we have no evidence on the role of the extramitochondrial mt rRNAs in sea urchin development, it is speculated considering roles of extramitochondrial mt 16S rRNA in Drosophila development that extramitochondrial mt rRNA may be implicated in development of sea urchin embryos.

• 社団法人日本動物学会の論文
• 1999-06-15

著者

• Akasaka Kouji

  Mmbs Graduate School Of Science University Of Tokyo

• Akasaka K

  Misaki Marine Biological Station Graduate School Of Science The University Of Tokyo

• Koji Akasaka

  Department Of Mathematical And Life Sciences Graduate School Of Science Hiroshima University

• KOBAYASHI Satoru

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Ogawa M

  Faculty Of Letters Keio University

• Ogawa M

  Tokyo Univ. Sci. Chiba Jpn

• Shimada Hiraku

  Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University

• Akasaka Koji

  Graduate Department of Mathematical & Life Sciences, Hiroshima Univ.

• Shimada Hiraku

  Graduate Department of Mathematical & Life Sciences, Hiroshima Univ.

• Kinoshita Tsutomu

  Laboratory Of Developmental Biology Faculty Of Science Kwansei Gakuin University

• Ogawa M

  Department Of Biologocal Science & Tecnology Tokyo University Of Science

• Akasaka Koji

  Graduate Department Of Gene Science Faculty Of Science Hiroshima University

• Amikura R

  Okazaki National Res. Inst. Okazaki

• Amikura Reiko

  Institute Of Biological Science Center For Tsukuba Advanced Research Alliance (tara) And Gene Experi

• Shimada H

  Department Of Mathematical And Life Sciences Graduate School Of Science Hiroshima University

• Shimada Hiraku

  Graduate Department Of Gene Science Faculty Of Science Hiroshima University

• Ogawa Mari

  Graduate Department of Gene Science, Faculty of Science, Hiroshima University

• Akasaka K

  Hiroshima Univ. Higashi‐hiroshima Jpn

• Shimada H

  Hiroshima Univ. Higashi‐hiroshima Jpn

• Shimada Hiraku

  Graduate Department Of Mathematical & Life Sciences Hiroshima Univ.

• Kobayashi Satoru

  Institute For Plasma Research University Of Maryland

• Akasaka Koji

  Graduate Department Of Mathematical & Life Sciences Hiroshima Univ.

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