Macrotransposition and other complex chromosomal restructuring in maize by closely linked transposons in direct orientation.

The Plant Cell
Jun T Huang, H K Dooner

Abstract

Several observations indicate that compatible ends of separate, yet closely linked, transposable elements (TEs) can interact in alternative transposition reactions. First, pairs of TEs cause chromosome breaks with frequencies inversely related to the intertransposon distance. Second, some combinations of two TEs produce complex rearrangements that often include DNA adjacent to one or both elements. In pairs of TEs in direct orientation, alternative reactions involving the external ends of the two TEs should lead to the transposition of a macrotransposon consisting of both elements plus the intervening chromosomal segment. Such macrotransposons have been hypothesized previously based on deletions, but no macrotransposon insertions have been recovered. To detect macrotransposition, we have analyzed heritable chromosomal rearrangements produced by a chromosome-breaking pair of Ac and Ds elements situated 6.5 kb apart in direct orientation in a part of the maize (Zea mays) genome dispensable for viability. Here, we show that the postulated macrotransposon can excise and reinsert elsewhere in the genome. In addition, this transposon pair produces other complex rearrangements, including deletions, inversions, and reshuffling of the i...Continue Reading

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