Journal
JOURNAL OF NEUROSCIENCE
Volume 26, Issue 19, Pages 5265-5275Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.4680-05.2006
Keywords
inner ear; stereociliary bundle; mechanosensory hair cell; cochlea; Van Gogh; Frizzled; planar polarity
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Funding
- Medical Research Council [MC_UP_1502/1] Funding Source: researchfish
- MRC [MC_UP_1502/1] Funding Source: UKRI
- Intramural NIH HHS Funding Source: Medline
- Medical Research Council [MC_UP_1502/1] Funding Source: Medline
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Planar cell polarity (PCP) is a process in which cells develop with uniform orientation within the plane of an epithelium. To begin to elucidate the mechanisms of PCP in vertebrates, the localization of the protein Vangl2 (Van Gogh-like) was determined during the development of the mammalian cochlea. Results indicate that Vangl2 becomes asymmetrically localized to specific cell-cell boundaries along the axis of polarization and that this asymmetry is lost in PCP mutants. In addition, PDZ2 (postsynaptic density/Discs large/zona occludens 1), PDZ3, and PDZ4 of the PCP protein Scrb1 (Scribble) are shown to bind to the C-terminal PDZ binding domain of Vangl2, suggesting that Scrb1 plays a direct role in asymmetric targeting of Vangl2. Finally, Fz3 (Frizzled), a newly demonstrated mediator of PCP, is also asymmetrically localized in a pattern that matches that of Vangl2. The presence and asymmetry of Fz3 at the membrane is shown to be dependent on Vangl2. This result suggests a role for Vangl2 in the targeting or anchoring of Fz3, a hypothesis strengthened by the existence of a physical interaction between the two proteins. Together, our data support the idea that protein asymmetry plays an important role in the development of PCP, but the colocalization and interaction of Fz3 and Vangl2 suggests that novel PCP mechanisms exist in vertebrates.
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