Deletions and Breaks Involving the Borders of the Ac Element in the bz-m2(Ac) Allele of Maize
The corn Ac-Ds transposable element (te) system, the first one described by McClintock (15,16), consists of the autonomous element Ac (Activator) and the nonautonomous element Ds (Dissociation). That is, even though both elements can transpose, only Ac can induce its own transposition and that of Ds. There is extensive evidence in the literature that the te Ac can undergo and mediate a series of mutational changes. One type of change described by McClintock (17–20) is mutation of Ac to Ds. The genetic and molecular analysis of mutant Ds derivatives from Ac has helped to define regions of Ac that specify transposition functions in maize (8,12,22). With the recent demonstration that Ac transposes in tobacco (1), we can expect a finer mutational resolution of the transposase function of Ac. In this paper, we describe other types of mutations, the analysis of which has allowed us to obtain information on different transposition properties of Ac.
KeywordsCellulose Maize Recombination Element Activator
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