
Armadillo coactivates transcription driven by the product of the Drosophila segment polarity gene dTCF.
The vertebrate transcription factors TCF (T cell factor) and LEF (lymphocyte enhancer binding factor) interact with beta-catenin and are hypothesized to mediate Wingless/Wnt signaling. We have cloned a maternally expressed Drosophila TCF family member, dTCF. dTCF binds a canonical TCF DNA motif and interacts with the beta-catenin homolog Armadillo. Previous studies have identified two regions in Armadillo required for Wingless signaling. One of these interacts with dTCF, while the other constitutes a transactivation domain. Mutations in dTCF and expression of a dominant-negative dTCF transgene cause a segment polarity phenotype and affect expression of the Wingless target genes engrailed and Ultrabithorax. Epistasis analysis positions dTCF downstream of armadillo. The Armadillo-dTCF complex mediates Wingless signaling as a bipartite transcription factor.
Duke Scholars
Altmetric Attention Stats
Dimensions Citation Stats
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Wnt1 Protein
- Transcription, Genetic
- Transcription Factors
- Trans-Activators
- Signal Transduction
- Repressor Proteins
- Proto-Oncogene Proteins
- Polymerase Chain Reaction
- Mutation
- Molecular Sequence Data
Citation

Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Wnt1 Protein
- Transcription, Genetic
- Transcription Factors
- Trans-Activators
- Signal Transduction
- Repressor Proteins
- Proto-Oncogene Proteins
- Polymerase Chain Reaction
- Mutation
- Molecular Sequence Data