Nucleic Acids Research, 1985, Vol. 13, No. 2 485-500
© 1985
Articles |
Distinct characteristics of loop sequences of two Drosophila foldback transposable elements
Department of Molecular Biology and Biochemistry, Wesleyan University Middletown, CT 06457, USA
Received September 10, 1984. Revised December 18, 1984. Accepted December 18, 1984.
A few foldback (FB) transposable elements have, between their long terminal inverted repeats, central loop sequences which have been shown to be different from FB inverted repeat sequences. We have investigated loop sequences from two such FB elements by analyzing their genomic distribution and sequence conservation and, in particular, by determining if they are normally associated with FE elements. One of these FB loop sequences seems to be present in a few conserved copies found adjacent to FB inverted repeat sequences, suggesting that it represents an integral component of some FB elements. The other loop sequence is less well-conserved and not usually associated with FR inverted repeats. This sequence is a member of another famtly of transposable elements, the HR family, and was found inserted in an FB element only by chance. We compare the complete DNA sequences of two HE elements and examine the ends of four HB elements.
*Present address: Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA
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