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First published online August 5, 2009; 10.1104/pp.109.138024

Plant Physiology 151:1250-1263 (2009)
© 2009 American Society of Plant Biologists

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MERE1, a Low-Copy-Number Copia-Type Retroelement in Medicago truncatula Active during Tissue Culture1,[C],[W]

Alexandra Rakocevic, Samuel Mondy, Leïla Tirichine, Viviane Cosson, Lysiane Brocard, Anelia Iantcheva, Anne Cayrel, Benjamin Devier, Ghada Ahmed Abu El-Heba2 and Pascal Ratet*

Institut des Sciences du Végétal, CNRS, 91198 Gif sur Yvette, France (A.R., S.M., L.T., V.C., L.B., A.C., B.D., G.A.A.E.-H., P.R.); and AgroBioinstitute, 1164 Sofia, Bulgaria (A.I.)

We have identified an active Medicago truncatula copia-like retroelement called Medicago RetroElement1-1 (MERE1-1) as an insertion in the symbiotic NSP2 gene. MERE1-1 belongs to a low-copy-number family in the sequenced Medicago genome. These copies are highly related, but only three of them have a complete coding region and polymorphism exists between the long terminal repeats of these different copies. This retroelement family is present in all M. truncatula ecotypes tested but also in other legume species like Lotus japonicus. It is active only during tissue culture in both R108 and Jemalong Medicago accessions and inserts preferentially in genes.

1 This work was supported by a fellowship from the French Ministère de l'Education Nationale, de l'Enseignement Supérieur et de la Recherche, to A.R., by the Grain Legumes Integrated Project (grant no. FOOD–CT–2004–506223 to L.B. and A.C.), and by a UNESCO-L'OREAL-cosponsored Fellowship for Young Women in Life Science-2006 to G.A.A.E.-H.

2 Present address: Agricultural Genetic Engineering Research Institute, Agricultural Research Centre, 9 Gamaa St., Giza 12619, Egypt.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Pascal Ratet (pascal.ratet{at}isv.cnrs-gif.fr).

[C] Some figures in this article are displayed in color online but in black and white in the print edition.

[W] The online version of this article contains Web-only data.

www.plantphysiol.org/cgi/doi/10.1104/pp.109.138024

* Corresponding author; e-mail pascal.ratet{at}isv.cnrs-gif.fr.

Received March 3, 2009; accepted July 29, 2009; published August 5, 2009.




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