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Plant Cell Advance Online Publication
Published on February 21, 2003; 10.1105/tpc.008623

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Received October 15, 2002
Accepted December 5, 2002

Telomerase Dependence of Telomere Lengthening in ku80 Mutant Arabidopsis

Maria Eugenia Gallego 1, Nicole Jalut 1, and Charles I. White 1*

1 Unité Mixte de Recherche 6547 du Centre National de la Recherche Scientifique, Université Blaise Pascal 24, 63177 Aubière, France

* To whom correspondence should be addressed. E-mail: chwhite{at}univ-bpclermont.fr.

We have identified a ku80 mutant of Arabidopsis and show that telomerase is needed to generate the longer telomeres observed in this mutant. Telomeres are specialized nucleoprotein structures at the ends of chromosomes that permit cells to distinguish chromosome ends from double-strand breaks, thus preventing chromosome fusion events. Ku80 deficiency results in the lengthening of telomeres, a phenotype also seen in an Arabidopsis ku70 mutant. Furthermore, homogeneous populations of ku80 mutant cells show a steady increase in the length of telomere tracts, which reach an equilibrium length and then stabilize. In contrast to that in mammals, Ku80 deficiency in Arabidopsis cells does not cause end-to-end fusion of chromosomes. This telomere lengthening is dependent on the presence of telomerase, although it is not attributable to a significant increase in telomerase activity per se. These results demonstrate the essential role of the Ku80 protein as a negative regulator of telomerase function in plant cells.




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