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RESEARCH ARTICLE
Rap1 acts via multiple mechanisms to position Canoe/Afadin and adherens junctions and mediate apical-basal polarity establishment
Teresa T. Bonello, Kia Z. Perez-Vale, Kaelyn D. Sumigray, Mark Peifer
Development 2017 : dev.157941 doi: 10.1242/dev.157941 Published 22 December 2017
Teresa T. Bonello
Department of Biology, University of North Carolina at Chapel Hill, CB#3280, Chapel Hill, NC 27599-3280, USA
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Kia Z. Perez-Vale
Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Kaelyn D. Sumigray
Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Mark Peifer
Department of Biology, University of North Carolina at Chapel Hill, CB#3280, Chapel Hill, NC 27599-3280, USACurriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USALineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Abstract

Epithelial apical-basal polarity drives assembly and function of most animal tissues. Polarity initiation requires cell-cell adherens junction assembly at the apical-basolateral boundary. The mechanisms underlying polarity establishment remain key issues. Drosophila embryos provide a superb model, as 6000 polarized cells assemble simultaneously. Current data place the actin-junctional linker Canoe (Afadin's fly homolog) at the top of the polarity hierarchy, where it directs Bazooka/Par3 and adherens junctions positioning. Here we define mechanisms regulating Canoe localization/function. Spatial organization of Canoe is multifaceted, involving membrane-localization, recruitment to nascent junctions and macromolecular assembly at tricellular junctions. Our data suggest apical activation of the small GTPase Rap1 regulates all three events, but support multiple modes of regulation. The Rap1GEF Dizzy/PDZ-GEF is critical for Canoe tricellular junction enrichment but not apical retention. Canoe's Rap1-interacting RA-domains mediate adherens junction and tricellular junction recruitment but are dispensable for membrane-localization. Our data also support a role for Canoe-multimerization. These multifactorial inputs all shape Canoe localization, correct Bazooka/Par3 and adherens junction positioning, and thus apical-basal polarity. We integrate existing data into a new polarity establishment model.

  • Received July 31, 2017.
  • Accepted December 18, 2017.
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Keywords

  • Cadherin
  • Cell adhesion
  • Morphogenesis

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Rap1 acts via multiple mechanisms to position Canoe/Afadin and adherens junctions and mediate apical-basal polarity establishment
Teresa T. Bonello, Kia Z. Perez-Vale, Kaelyn D. Sumigray, Mark Peifer
Development 2017 : dev.157941 doi: 10.1242/dev.157941 Published 22 December 2017
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Rap1 acts via multiple mechanisms to position Canoe/Afadin and adherens junctions and mediate apical-basal polarity establishment
Teresa T. Bonello, Kia Z. Perez-Vale, Kaelyn D. Sumigray, Mark Peifer
Development 2017 : dev.157941 doi: 10.1242/dev.157941 Published 22 December 2017

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