TIAM-1/GEF can shape somatosensory dendrites independently of its GEF activity by regulating F-actin localization
- Albert Einstein College of Medicine, United States
Abstract
Dendritic arbors are a crucial for nervous system assembly, but the intracellular mechanisms that govern their assembly remain incompletely understood. Here we show that the dendrites of PVD neurons in Caenorhabditis elegans are patterned by distinct pathways downstream of the DMA-1 leucine rich transmembrane (LRR-TM) receptor. DMA-1/LRR-TM interacts through a PDZ ligand motif with the guanine nucleotide exchange factor TIAM-1/GEF in a complex with act-4/Actin to pattern higher order 4º dendrite branches by localizing F-actin to the distal ends of developing dendrites. Surprisingly, TIAM-1/GEF appears to function independently of Rac1 guanine nucleotide exchange factor activity. A partially redundant pathway, dependent on HPO-30/Claudin, regulates formation of 2º and 3º branches, possibly by regulating membrane localization and trafficking of DMA-1/LRR-TM. Collectively, our experiments suggest that HPO-30/Claudin localizes the DMA-1/LRR-TM receptor on PVD dendrites, which in turn can control dendrite patterning by directly modulating F-actin dynamics through TIAM-1/GEF.
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All data generated or analyzed during this study are included in the manuscript and supporting files.
Article and author information
Author details
Carlos A Diaz-Balzac
Nelson J Ramirez-Suarez
Funding
National Institute of Neurological Disorders and Stroke (R21NS081505)
- Hannes E Bülow
National Institute of General Medical Sciences (T32GM007288)
- Carlos A Diaz-Balzac
Eunice Kennedy Shriver National Institute of Child Health and Human Development (F31HD066967)
- Carlos A Diaz-Balzac
Fulbright-Colciencias
- Nelson J Ramirez-Suarez
Irma T Hirschl/Monique Weill-Caulier
- Hannes E Bülow
National Institute of Neurological Disorders and Stroke (F31NS100370)
- Maisha Rahman
National Institute of General Medical Sciences (T32GM07491)
- Maria I Lázaro-Peña
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Copyright
© 2019, Tang et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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TIAM-1/GEF can shape somatosensory dendrites independently of its GEF activity by regulating F-actin localization
eLife 8:e38949.
https://doi.org/10.7554/eLife.38949
