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Nucleic Acids Research, 1986, Vol. 14, No. 2 675-691
© 1986

Articles

Genomic and structural organization of Drosophila melanogaster G elements

Pier Paolo Di Nocera*,1,2, Franco Graziani2 and Giovanni Lavorgna2

1Dipartimento di Biologia e Patologia Cellulare e Molecolare, University of Naples, Second Medical School Italy 2Istituto Intemazionale di Genetica e Biofisica, CNR, Via Guglielmo Marconi 10 80125 Naples, Italy

*To whom reprint requests should be sent. Present address: c/o European Molecular Biology Laboratory, Postfach 10.2209, 6900 Heidelberg 1, FRG

Received November 18, 1985. Accepted December 17, 1985.

The properties and the genomic organization of G elements, a moderately repeated DNA family of D. melanogaster, are reported. G elements lack terminal repeats, generate target site duplications at the point of insertion and exhibit at one end a stretch of A residues of variable lenght. In a large number of recombinant clones analyzed G elements occur in tandem arrays, interspersed with specific ribosomal DNA (rDNA) segments. This arrangement results from the insertion of members of the G family within the nontranscribed spacer (NTS) of rDNA units. Similarity of the site of integration of G elements to that of ribosomal DNA insertions suggests that distinct DNA sequences might have been inserted into rDNA through a partly common pathway.


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