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. 1994 Apr;30(4):437-44.

[Tv1--a new family of Drosophila virilis retrotransposons]

[Article in Russian]
B V Andrianov, N G Shuppe
  • PMID: 8045392

[Tv1--a new family of Drosophila virilis retrotransposons]

[Article in Russian]
B V Andrianov et al. Genetika. 1994 Apr.

Abstract

A new method for isolation and cloning of functionally active retrotransposons was proposed and tested. The method is based on the hypothesis about the universal character of retrotransposition through reverse transcription. A new retrotransposon family (Tvl) was coned from the Drosophila virilis genome. A full-length Tvl copy was 7 kb. The cell line under consideration contained 500-1000 Tvl copies per cell, i.e., it accounted for 0.3% of the genome. Tvl RNA, detected in the cell culture, was almost absent in cells of adult flies. A 7-kb polyadenylated RNA was the main transcript of Tvl. Extrachromosomal circular and linear Tvl copies were cloned and characterized. The following features of Tvl structural organization were studied: (1) element was flanked by perfect direct repeats of 453 bp size (long terminal repeats, LTRs); (2) element sequences adjacent to the LTRs were homologous to binding sites of primer serine tRNA and the polypurine blocks of retrotransposons 17.6 and 297; and (3) expected transcription of LTRs occurred as for known retrotransposons, --producing RNA with a direct terminal repeat.

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