Characterization of the FB-NOF transposable element of Drosophila melanogaster.

FB-NOF is a composite transposable element of Drosophila melanogaster. It is composed of foldback sequences, of variable length, which flank a 4-kb NOF sequence with 308-bp inverted repeat termini. The NOF sequence could potentially code for a 120-kD polypeptide. The FB-NOF element is responsible for unstable mutations of the white gene (wc and wDZL) and is associated with the large TEs of G. Ising. Although most strains of D. melanogaster have 20-30 sites of FB insertion, FB-NOF elements are usually rare, many strains lack this composite element or have only one copy of it. A few strains, including wDZL and Basc have many (8-21) copies of FB-NOF, and these show a tendency to insert at "hot-spots." These strains also have an increased number of FB elements. The DNA sequence of the NOF region associated with TE146(Z) has been determined.

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