| Title | The atypical cadherin Flamingo links Frizzled and Notch signaling in planar polarity establishment in the Drosophila eye. | | Author(s) | Das G, Reynolds-Kenneally J, Mlodzik M | | Institution | Department of Molecular, Cell and Developmental Biology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA. | | Source | Dev Cell 2002 May; 2(5):655-66. | | MeSH | Animals
Body Patterning
Cadherins
Drosophila
Drosophila Proteins
Eye
Gene Expression Regulation, Developmental
Membrane Proteins
Mutation
Phenotype
Photoreceptors, Invertebrate
Receptors, Notch
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Signal Transduction
Wing
| | Abstract | Planar cell polarity is established in the Drosophila eye through distinct fate specification of photoreceptors R3 and R4 by a two-tiered mechanism employing Fz and Notch signaling: Fz signaling specifies R3 and induces Dl to activate Notch in R4. We show that the atypical cadherin Flamingo (Fmi) plays critical, but distinct, roles in both R3 and R4. Fmi is first enriched at equatorial cell borders of R3/R4, positively interacting with Fz/Dsh. Subsequently, Fmi is upregulated in R4 by Notch and functions to downregulate Dl expression by antagonizing Fz signaling. This in turn amplifies and enforces the initial Fz-signaling bias in the R3/R4 pair. Our results reveal differences in the planar cell polarity genetic circuitry between the eye and the wing. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 12015972 |
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