Approximately 170 kilobase pairs (kb) of contiguous DNA sequences derived from bands 3A3,4 of the Drosophila melanogaster X chromosome have been isolated by molecular cloning. Sequences required for the wild-type expression of the zeste locus are located within a 6-kb fragment of this chromosomal region, as shown by phenotypic rescue of zeste mutants in P element-mediated germ-line transformation. Expression of zeste is correlated with a 2.2-kb poly(A)+ RNA species transcribed at all postzygotic stages of Drosophila development. Many zeste alleles, including several producing neomorphic phenotypes, are not associated with detectable rearrangements of DNA.
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