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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2010

Translationally controlled tumor protein is a conserved mitotic growth integrator in animals and plants.

Résumé

The growth of an organism and its size determination require the tight regulation of cell proliferation and cell growth. However, the mechanisms and regulatory networks that control and integrate these processes remain poorly understood. Here, we address the biological role of Arabidopsis translationally controlled tumor protein (AtTCTP) and test its shared functions in animals and plants. The data support a role of plant AtTCTP as a positive regulator of mitotic growth by specifically controlling the duration of the cell cycle. We show that, in contrast to animal TCTP, plant AtTCTP is not implicated in regulating postmitotic growth. Consistent with this finding, plant AtTCTP can fully rescue cell proliferation defects in Drosophila loss of function for dTCTP. Furthermore, Drosophila dTCTP is able to fully rescue cell proliferation defects in Arabidopsis tctp knockouts. Our data provide evidence that TCTP function in regulating cell division is part of a conserved growth regulatory pathway shared between plants and animals. The study also suggests that, although the cell division machinery is shared in all multicellular organisms to control growth, cell expansion can be uncoupled from cell division in plants but not in animals.

Dates et versions

hal-00521824 , version 1 (28-09-2010)

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F. Brioudes, Anne-Marie Thierry, Pierre Chambrier, B. Mollereau, Mohammed Bendahmane. Translationally controlled tumor protein is a conserved mitotic growth integrator in animals and plants.. Proceedings of the National Academy of Sciences of the United States of America, 2010, 107, pp.16384-16389. ⟨10.1073/pnas.1007926107⟩. ⟨hal-00521824⟩
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