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Plant Physiol, March 2001, Vol. 125, pp. 1293-1303

Mutator Transposase Is Widespread in the Grasses1

Damon R. Lisch,* Michael Freeling, Richard J. Langham, and Ming Y. Choy

Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, California 94720

Although the Mutator (Mu) system is well characterized in maize (Zea mays), very little is known about this highly mutagenic system of transposons in other grasses. Mutator is regulated by the MuDR class of elements, which encodes two genes, one of which, mudrA, has similarity to a number of bacterial transposases. Experiments in our laboratory, as well as database searches, demonstrate that mudrA sequences are ubiquitous and diverse in the grasses. In several species it is clear that multiple paralogous elements can be present in a single genome. In some species such as wheat (Triticum aestivum) and rice (Oryza sativa), mudrA-similar sequences are represented in cDNA databases, suggesting the presence of active Mu transposon systems in these species. Further, in rice and in sorghum, mudrA-like genes are flanked by long terminal inverted repeats, as well as the short host sequence direct repeats diagnostic of insertion. Thus, there is ample evidence that systems related to Mu in maize are at least potentially active in a wide variety of grasses. However, the mudrB gene, though important for Mu activity in maize, is not necessarily a component of Mu elements in other grasses.

1 This work was supported entirely by the Novartis Agricultural Discovery Institute Inc. (now Syngenta Agricultural Discovery Institute) University of California-Berkeley Strategic Alliance.

* Corresponding author; e-mail dlisch{at}uclink4.berkeley.edu; fax 510-642-4995.

© 2001 American Society of Plant Physiologists


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