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Journal Article
Subcellular localization of Bic-D::GFP is linked to an asymmetric oocyte nucleus
C. Pare, B. Suter
Journal of Cell Science 2000 113: 2119-2127;
C. Pare
McGill University, Department of Biology, Montreal, Quebec, Canada, H3A 1B1.
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B. Suter
McGill University, Department of Biology, Montreal, Quebec, Canada, H3A 1B1.
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Summary

Bicaudal-D (Bic-D) is essential for the establishment of oocyte fate and subsequently for polarity formation within the developing Drosophila oocyte. To find out where in the germ cells Bic-D performs its various functions we made transgenic flies expressing a chimeric Bic-D::GFP fusion protein. Once Bic-D::GFP preferentially accumulates in the oocyte, it shows an initial anterior localization in germarial region 2. In the subsequent egg chamber stages 1–6 Bic-D::GFP preferentially accumulates between the oocyte nucleus and the posterior cortex in a focus that is consistently aligned with a crater-like indentation in the oocyte nucleus. After stage 6 Bic-D::GFP fluorescent signal is predominantly found between the oocyte nucleus and the dorso-anterior cortex. During the different phases several genes have been found to be required for the establishment of the new Bic-D::GFP distribution patterns. Dynein heavy chain (Dhc), spindle (spn) genes and maelstrom (mael) are required for the re-localization of the Bic-D::GFP focus from its anterior to its posterior oocyte position. Genes predicted to encode proteins that interact with RNA (egalitarian and orb) are required for the normal subcellular distribution of Bic-D::GFP in the germarium, and another potential RNA binding protein, spn-E, is required for proper transport of Bic-D::GFP from the nurse cells to the oocyte in later oogenesis stages. The results indicate that Bic-D requires the activity of mRNA binding proteins and a negative-end directed microtubule motor to localize to the appropriate cellular domains. Asymmetric subcellular accumulation of Bic-D and the polarization of the oocyte nucleus may reflect the function of this localization machinery in vectorial mRNA localization and in tethering of the oocyte nucleus. The subcellular polarity defined by the Bic-D focus and the nuclear polarity marks some of the first steps in antero-posterior and subsequently in dorso-ventral polarity formation.

  • © 2000 by Company of Biologists

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Journal Article
Subcellular localization of Bic-D::GFP is linked to an asymmetric oocyte nucleus
C. Pare, B. Suter
Journal of Cell Science 2000 113: 2119-2127;
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Subcellular localization of Bic-D::GFP is linked to an asymmetric oocyte nucleus
C. Pare, B. Suter
Journal of Cell Science 2000 113: 2119-2127;

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