The Drosophila hedgehog gene is expressed specifically in posterior compartment cells and is a target of engrailed regulation.
cDNAs were isolated that represent transcripts of the Drosophila segment polarity gene, hedgehog (hh). Sequence analysis reveals a motif characteristic of a transmembrane domain, suggesting that the hh protein is membrane-associated. hh expression in epidermal cells is confined to the posterior compartments and coincides precisely with that of engrailed (en). Despite the similar patterns of expression in the cellular blastoderm, hh expression is independent of en, but hh expression becomes sensitive to and dependent on en during the extended germ band stage. The ectopic expression of hh that is normally induced in patched (ptc) mutant embryos does not appear in ptc en double mutants. We discuss these findings in terms of the relationship between en and hh, and the role of the hh function.
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Department of Biochemistry and Biophysics, University of California at San Francisco 94143.
Eaton
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Kornberg
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D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004247:DNA; D004330:Drosophila / Q000235:genetics*; D029721:Drosophila Proteins; D005786:Gene Expression Regulation; D017344:Genes, Insect; D018398:Homeodomain Proteins; D007301:Insect Hormones / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D014157:Transcription Factors / Q000235:genetics*
D029721:Drosophila Proteins; C063459:En protein, Drosophila; D018398:Homeodomain Proteins; D007301:Insect Hormones; D014157:Transcription Factors; D004247:DNA