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Nucleic Acids Research, 1989, Vol. 17, No. 17 6939-6945
© 1989

MOLECULAR BIOLOGY

Characterization of 5' truncated transposed copies of the I factor in Drosophila melanogaster

Isabelle Busseau+, Alain Pelisson and Alain Bucheton*,+

Laboratoire de Génétique, Unité associée au CNRS no. 360, Université Blaise Pascal, 63177 Aubiere Cedex, France

*To whom correspondence should be addressed

Received May 22, 1989. Accepted August 4, 1989.

I factors in Drosophila melanogaster are transposable elements structurally related to Mammalian LINEs. Their transposition is activated at high frequencies during I-R hybrid dysgenesis and is associated with the production of mutations of various sorts. Very few of these mutations have been studied at the molecular level; those reported so far result either from chromosomal rearrangements or from insertions of complete I factors. We have analysed three I-R induced yellow mutations and have found that one of them is due to the insertion of an I element very similar to the complete I factor, whereas the other two are due to insertions of I elements that are truncated at their 5' ends; one of them exhibits an unusual 3' end. We discuss possible mechanisms of production of such modified I elements.

+Present address: Centre de Oénétique Moléculaire, CNRS, 91190 Gif-sur-Yvette, France


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