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Journal of Cell Science, Vol 110, Issue 21 2629-2634, Copyright © 1997 by Company of Biologists

JOURNAL ARTICLES

To bead or not to bead? Lens-specific intermediate filaments revisited

SD Georgatos, F Gounari, G Goulielmos and U Aebi
Department of Basic Sciences, The University of Crete, Faculty of Medicine, Heraklion, Greece.

For nearly three decades cytoplasmic intermediate filaments (IFs) have been described as 10 nm thick, unbranched ropes radiating from the cell nucleus and extending to the plasma membrane. This stereotype is now being challenged by the discovery and molecular characterization of the beaded filaments (BFs), a novel class of IFs composed of the lens-specific proteins filensin and phakinin. In contrast to 'mainstream' IFs, BFs have a distinctly nodular appearance and form a meshwork underneath the plasma membrane of the lens fiber cells. In vitro assembly studies, expression of filensin and phakinin in cultured cells, and analysis of the corresponding genes reveal that these proteins have evolved from two different subfamilies of IF proteins, thus yielding a unique structure. The new information provides a basis for understanding how the various forms of tissue-specific IF proteins might have developed adopting to the constraints of a specialized environment.
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© The Company of Biologists Ltd 1997