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The Journal of Neuroscience, October 1, 1999, 19(19):8454-8463
The Neuronal Architecture of Xenopus Retinal Ganglion
Cells Is Sculpted by Rho-Family GTPases In Vivo
Maureen L.
Ruchhoeft1,
Shin-ichi
Ohnuma2,
Lisa
McNeill1, 3,
Christine E.
Holt2, and
William A.
Harris2
1 Biology Department, University of California at San
Diego, La Jolla, California 92093-0357, 2 Department of
Anatomy, Cambridge University, Cambridge, CB2 3DY, United Kingdom, and
3 Xcyte Therapies, Seattle, Washington 98134
Dendritogenesis, axonogenesis, pathfinding, and target recognition
are all affected in distinct ways when Xenopus retinal ganglion cells (RGCs) are transfected with constitutively active (ca),
wild-type (wt), and dominant negative (dn) Rho-family GTPases in
vivo. Dendritogenesis required Rac1 and Cdc42 activity.
Moreover, ca-Rac1 caused dendrite hyperproliferation. Axonogenesis, in
contrast, was inhibited by ca-Rac1. This phenotype was partially
rescued by the coexpression of dn cyclin-dependent kinase
(Cdk5), a proposed effector of Rac1, suggesting that Rac1 activity must
be regulated tightly for normal axonogenesis. Growth cone
morphology was particularly sensitive to dn-RhoA and wt-Cdc42
constructs. These also caused targeting errors, such as tectal bypass,
suggesting that cytoskeletal rearrangements are involved in target
recognition and are transduced by these pathways.
Key words:
RhoA; Rac1; Cdc42; axonogenesis; dendritogenesis; GTPase
Copyright © 1999 Society for Neuroscience 0270-6474/99/19198454-10$05.00/0
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