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Nucleic Acids Research, 1988, Vol. 16, No. 17 8213-8231
© 1988

Articles

Structure, evolution and properties of a novel repetitive DNA family in Caenorhabditis elegans

Adriana La Volpe*, Maria Ciaramella and Paolo Bazzicalupo

International Institute of Genetics and Biophysics-CNR Via Marconi 10, 1-80125, Naples, Italy

*To whom correspondence should be addressed

Received July 27, 1988. Accepted August 15, 1988.

We have identified a moderately repeated DNA sequence in Caenorhabditis elegans present at least at twenty different locations in the genome. Elements of this intermingled repetitive DNA family are made up of tandem subreapeats whose smaller unit is ten base pairs long. The occurrence of single base changes between units is reminiscent of mammalian satellite DNA. Sequence analysis has shown that the consensus of these repeats is identical to the consensus of the heat-shock element (HSE) common to all eukaryotes (C--GAA--TTC--G). This consensus in our sequences is repeated in tandem with an overlap of four bases (C--GAA--TTC--GAA--TTC...). We studied In detail one cloned element of the family and we were unable to detect transcription in the flanking regions either under normal growth or after heat induction. Nevertheless a 242 bp sequences out of this same element was sufficient, when located on a multicopy plasmid in Saccharomyces cerevisiae, to drive transcription from a downstream gene under heat shock conditions.


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