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Nucleic Acids Research, 1990, Vol. 18, No. 7 1731-1737
© 1990

MOLECULAR BIOLOGY

The chorion genes of the medfly, Ceratitis capitata, I: structural and regulatory conservation of the s36 gene relative to two Drosophila species

Mary Konsolaki1, Katia Komitopoulou2, Peter P. Tolias3, Dennis L. King3, Candace Swimmer3 and Fotis C. Kafatos1,3,*

1Institute of Molecular Biology and Biotechnology, Research Center of Crete PO Box 1527 and Department of Biology, University of Crete Heraclio 71110, Crete, Greece 2Department of Biochemistry, Cell and Molecular Biology and Genetics, University of Athens Panepistimiopolis, Kouponia, Athens 15701, Greece 3Department of Cellular and Developmental Biology, The Biological Laboratories, Harvard University 16 Divinity Avenue, Cambridge, MA 02138, USA

* To whom correspondence should be addressed at Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA

Received December 22, 1989. Revised March 1, 1990. Accepted March 1, 1990.

We have used low stringency screening with the Drosophila meianogaster s36 chorion gene to recover its homologue from genomic and cDNA libraries of the medfly, Ceratitis capitata. The same gene has also been recovered from a genomic library of D. virills. The medfly s36 gene shows similar developmental specificity as in Drosophila (early choriogenesis). It is also specifically amplified in ovarian follicles; this is the first report of chorlon gene ampliflcatlon outside the genus Drosophila. Alignments of s36 sequences from three species show that, in addition to its regulatory conservation, the 936 gene is extensively conserved in sequence, in a region corresponding to a central protein domain, and in short regions of 5' flanking DNA that might correspond to cis-regulatory elements.


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