Abstract
The dorsoventral axis of the Drosophila visual cortex is patterned by nonautonomous signals expressed at its dorsal and ventral margins. wingless (wg) expression at the margins induces decapentaplegic (dpp), optomotor blind (omb), and aristaless in adjacent domains. We show that Combgap, a zinc finger protein, represses Wg target gene expression in the visual cortex. Wg signal reception downregulates combgap expression and derepresses target gene transcription. Combgap participates in a Hedgehog-controlled circuit in the developing wing and leg by regulating the expression of Cubitus interruptus. Combgap is thus a tissue-specific relay between Wingless and its target genes for the determination of cell fate in the visual cortex.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Adaptor Proteins, Signal Transducing*
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Amino Acid Sequence
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Animals
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Axin Protein
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Body Patterning
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Carrier Proteins / genetics
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Carrier Proteins / metabolism
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Cell Differentiation*
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism
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Drosophila Proteins / genetics
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Drosophila Proteins / metabolism
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Drosophila melanogaster / cytology
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Drosophila melanogaster / embryology*
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Drosophila melanogaster / genetics
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Drosophila melanogaster / metabolism
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Ganglia / cytology
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Ganglia / embryology
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Ganglia / metabolism
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Gene Expression Regulation, Developmental
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Hedgehog Proteins
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Insect Proteins / genetics
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Insect Proteins / metabolism
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Molecular Sequence Data
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Mutation / genetics
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Nerve Tissue Proteins / genetics
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Organ Specificity
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Proto-Oncogene Proteins / genetics
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Proto-Oncogene Proteins / metabolism*
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RNA, Messenger / analysis
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RNA, Messenger / genetics
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Retina / cytology
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Retina / embryology
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Retina / metabolism
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Signal Transduction*
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T-Box Domain Proteins / genetics
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Transcription Factors / chemistry
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Transcription Factors / genetics
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Transcription Factors / metabolism*
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Visual Cortex / cytology*
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Visual Cortex / embryology*
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Visual Cortex / metabolism
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Wings, Animal / embryology
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Wings, Animal / metabolism
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Wnt1 Protein
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Zinc Fingers
Substances
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Adaptor Proteins, Signal Transducing
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Axin Protein
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Axn protein, Drosophila
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Carrier Proteins
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DNA-Binding Proteins
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Drosophila Proteins
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Hedgehog Proteins
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Insect Proteins
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Nerve Tissue Proteins
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Proto-Oncogene Proteins
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RNA, Messenger
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T-Box Domain Proteins
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Transcription Factors
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Wnt1 Protein
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cg protein, Drosophila
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ci protein, Drosophila
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dpp protein, Drosophila
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wg protein, Drosophila
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bi protein, Drosophila
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hh protein, Drosophila