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Journal of Cell Science, Vol 99, 515-521, Copyright © 1975 by Company of Biologists

Submitted on January 9, 1991
Revised on April 8, 1991
Accepted on April 8, 1991

Further observations on nucleolar tails in amphibian oocytes

PEDRO LEÓN 1, JAMES KEZER 2, and ERIC SCHABTACH 2

1 Centro de Investigacion.es en Biologla Celular y Molecular (CIBCM) and School of Medicine, University of Costa Rica, San José, Costa Rica
2 Department of Biology, University of Oregon, Eugene, Oregon 97403, USA

Author for correspondence

Large oocytes from some amphibian species possess beaded or unbeaded intranuclear tails that penetrate the extrachromosomal nucleoli through a distinct pit in their surface and attach to the central core component Here we show, using light and electron microscopy, that tails anchor nucleoli to the nuclear envelope through intricate attachment structures. These structures are composed of interconnected spherical masses containing highly convoluted tubules and associated extratubular proteins, directly directly in contact with the inner nuclear membrane. Fibers emerging from the nuclear pores seemingly hold the attachment complex in place. Beads on the nucleolar tails are formed by the accumulation of proteins on the outer surface of smooth tubules. The function of these intranuclear tubules is unknown

Key words: amphibian oocytes, amplified nucleoli, intranuclear tubules

Submitted on January 9, 1991
Revised on April 8, 1991
Accepted on April 8, 1991






© The Company of Biologists Ltd 1975