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Nucleic Acids Research, 1984, Vol. 12, No. 19 7517-7531
© 1984

MOLECULAR BIOLOGY

Circular copies of mobile dispersed genetic elements in cultured Drosophila melanogaster cells

Y.V. Ilyin*, N.G. Schuppe+, N.V. Lyubomirskaya, T.V. Gorelova+ and I.R. Arkhipova

Institute of Molecular Biology, USSR Academy of Sciences Vavilov str. 32, Moscow B-334 +N.I.Vavilov Institute of General Genetics, USSR Academy of Sciences Gubkin str. 3, Moscow B-333, USSR

*To whom correspondence should be sent

Received July 18, 1984. Revised September 14, 1984. Accepted September 14, 1984.

Extrachromosomal supercoiled circular copies of mobile dispersed genetic elements mdgi, mdg3 and copia have been isolated from 67J25D and Kc lines of cultured Drosophila melanogaster cells. With the exception of the copia element in the line Kc, all circular molecules contain only one long terminal repeat. Both whole-length circular copies and molecules with deletion from the internal segment of the copia element have been detected in the line 67J25D. Mdg3-specific circular molecules in the line Kc are represented by the deleted molecules only. Similar copies of mdg3 are also present in chromosomal UNA of flies and cultured cells.

The analysis of the mdg3 transcription in both cell lines suggests that extrachromosomal moleculeB of mdg may be created by reverse transcription.


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