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Nucleic Acids Research, 1982, Vol. 10, No. 24 8263-8272
© 1982

MOLECULAR BIOLOGY

Sequence organization of the ribosomal spacer of D.melanogaster

A. Simeone, A. de Falco, G. Macino* and E. Boncinelli

International Institute of Genetics and Biophysics CNR via Marconi 10, Napels *Istituto di Fisiologia, University of Rome Rome, Italy

Received October 29, 1982. Accepted November 19, 1982.

We subcloned several fragments of the rDNA nontranscribed spacer (NTS) of D.melanogaster and analysed their nucleotide sequence. The central portion contains a variable number of 240 base pair repeated sequences ending with two contiguous Alu I sites. Within every repeat there is a 42 base pair sequence perfectly homologous to the transcription initiation site from -18 to +24. Sequences homologous to the basic 240 bp repeat are present both at the end of the unique 1900 bp region downstream to the transcription termination site and within the unique region preceeding the transcription initiation site up to nucleotide -140. These results are discussed in relation to the general problem of ribosomal gene units apd their evolution.


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