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. 1992 Nov;132(3):699–711. doi: 10.1093/genetics/132.3.699

Ectopic Expression of the Drosophila Homeotic Gene Proboscipedia under Antennapedia P1 Control Causes Dominant Thoracic Defects

D L Cribbs 1, A M Pattatucci 1, M A Pultz 1, T C Kaufman 1
PMCID: PMC1205208  PMID: 1361474

Abstract

A deletion mutation in the Antennapedia Complex of Drosophila melanogaster, Df(3R)SCB(XL2), induces both dominant and recessive loss-of-function phenotypes. The deletion is associated with diminished function of proboscipedia (pb), a homeotic gene required for mouthparts formation. Df(3R)SCB(XL2) also has associated dominant thoracic defects related to diminished expression of the homeotic Antennapedia (Antp) gene copy on the homologous chromosome. This is shown to be a consequence of ectopic pb expression in the thorax. Newly juxtaposed Antp sequences provide the pb gene on the deletion bearing chromosome with a second promoter, Antp P1, in addition to its own. Ectopic pb protein expression occurs under Antp P1 control, by alternate splicing, and results in diminished accumulation of Antp protein in the imaginal disc cells where Antp P1 is normally expressed. The analysis of this mutant chromosome thus demonstrates that pb protein is capable of participating in the negative regulation of a more posteriorly expressed homeotic gene, as well as serving a homeotic ``selector'' function in the head.

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Selected References

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