FB elements are the common basis for the instability of the wDZL and wC Drosophila mutations - PubMed (original) (raw)
FB elements are the common basis for the instability of the wDZL and wC Drosophila mutations
R Levis et al. Cell. 1982 Sep.
Abstract
The DNA insertions that cause the highly unstable mutations wC and wDZL share extensive homology with the FB family of transposable elements. FB elements carry long, internally repetitious, inverted terminal repeats and thus differ in structure from other transposable elements. Our results suggest that FB elements may excise and cause chromosomal rearrangements at unusually high frequencies. The wC insertion is a single FB element. The wDZL insertion differs in that it contains two FB elements, one at each terminus. The wC and wDZL insertions contain 4.0 and 6.5 kilobase nonhomologous segments between their terminal repeats. In contrast to the middle repetitive FB elements, the central segment of the wDZL insertion is single-copy and present at a fixed location in the wild-type genome. It has apparently been transposed by the action of flanking FB elements, causing the wDZL mutation at its new location.
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