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Nucleic Acids Research, 1982, Vol. 10, No. 13 3893-3904
© 1982

MOLECULAR BIOLOGY

The basic repeat unit of a Chironomus Balbiani ring gene

Helmut Baumlein*, Ulrich Wobus*, Susan A. Gerbi{dagger} and Foits C. Kafatos+

*Zentralinstitut für Genetik und Kulturpflanzenforschung Akad. Wiss DDR, DDR-4325 Gatersleben, GDR, USA {dagger}Division of Biology and Medicine, Brown Univ. Providence, RI 02912, RI 02912, USA +Cellular and Developmental Biology, The Biological Laboratories, Harvard Univ. Cambridge, MA 02138, USA

Received March 29, 1982. Revised June 1, 1982. Accepted June 1, 1982.

A clone derived from the Balbiani ring b (BRb) gene of Chironomus thummi has been used to study the internal organization of that gene. Much of the gene consists of approximately 80 copies of a ca. 300 bp repeat unit, which are tandemly organized. The BRb clone contains a major part of that unit (242 bp). Sequence analysis shows that approximately 60% of the unit corresponds to short, tandemly organized subsequences, which encode peptides 8 to 11 residues long. In turn, each subsequence consists of even shorter internal repeats, corresponding to a tripeptide (consensus Proline.Serine.Lysine.). The remainder of the ca. 300 bp unit probably does not have obvious repetitive substructure.


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