Analysis of the ftz upstream element: germ layer-specific enhancers are independently autoregulated

Genes Dev. 1990 Jul;4(7):1224-39. doi: 10.1101/gad.4.7.1224.

Abstract

The Drosophila fushi tarazu (ftz) upstream element is an enhancer-like element that is required for the correct expression of ftz in developing embryos and that directs transcription from a minimal promoter in a ftz-like seven-striped pattern. Using a deletion analysis, we have identified several independent cis-regulatory elements in the upstream element. A distal enhancer directs fusion gene expression in seven stripes primarily in the mesoderm. A more complex proximal enhancer contains a mesodermally active element and a second element with which it interacts to generate seven stripes in the ectoderm. Striped expression directed by each enhancer is ftz-dependent, and each contains binding sites for purified ftz homeo domain. We suggest that ftz protein acts in combination with germ layer-restricted transcription factors directly and positively to regulate the transcription of its own gene.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Base Sequence
  • Drosophila Proteins
  • Drosophila melanogaster / embryology
  • Drosophila melanogaster / genetics*
  • Embryo, Nonmammalian / ultrastructure
  • Embryonic and Fetal Development
  • Enhancer Elements, Genetic*
  • Fushi Tarazu Transcription Factors
  • Gene Expression Regulation*
  • Genes, Homeobox*
  • Homeodomain Proteins*
  • Insect Hormones / genetics*
  • Molecular Sequence Data
  • Morphogenesis
  • Recombinant Fusion Proteins / biosynthesis
  • Transcription, Genetic

Substances

  • Drosophila Proteins
  • Fushi Tarazu Transcription Factors
  • Homeodomain Proteins
  • Insect Hormones
  • Recombinant Fusion Proteins
  • ftz protein, Drosophila