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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Springer Netherlands

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DOI

10.1002/bjs.1800062330

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ISSN

1573-5028

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Role of alternative telomere lengthening unmasked

Authors: Eva Růčková Jiří Friml Petra Procházková Schrumpfová Jiří Fajkus
Publish Date: 2008/02/01
Volume: 66, Issue: 6, Pages: 637-646
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Abstract

Telomeres in many eukaryotes are maintained by telomerase in whose absence telomere shortening occurs However telomerasedeficient Arabidopsis thaliana mutants Attert −/− show extremely low rates of telomere shortening per plant generation 250–500 bp which does not correspond to the expected outcome of replicative telomere shortening resulting from ca 1000 meristem cell divisions per seedtoseed generation To investigate the influence of the number of cell divisions per seedtoseed generation Attert −/− mutant plants were propagated from seeds coming either from the lowermost or the uppermost siliques L and Uplants and the length of their telomeres were followed over several generations The rate of telomere shortening was faster in Uplants than in Lplants as would be expected from their higher number of cell divisions per generation However this trend was observed only in telomeres whose initial length is relatively high and the differences decreased with progressive general telomere shortening over generations But in generation 4 the Lplants frequently show a net telomere elongation while the Uplants fail to do so We propose that this is due to the activation of alternative telomere lengthening ALT a process which is activated in early embryonic development in both U and Lplants but is overridden in Uplants due to their higher number of cell divisions per generation These data demonstrate what so far has only been speculated that in the absence of telomerase the number of cell divisions within one generation influences the control of telomere lengths These results also reveal a fast and efficient activation of ALT mechanisms in response to the loss of telomerase activity and imply that ALT is probably involved also in normal plant developmentWe thank Professor Andrew R Leitch for insightful comments and the manuscript revision Eva Sýkorová and Dagmar Zachová for helpful advice for cultivation of plant tissue cultures This work was supported by the Czech Ministry of Education MSM0021622415 LC06004 Czech Academy of Sciences AVOZ50040507 and grants from GACR 521/05/0055 and GA ASCR IAA600040505 and IAA601630703

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