Immunoglobulin-Domain Proteins Required for Maintenance of Ventral Nerve Cord Organization

Author:

Aurelio Oscar1,Hall David H.2,Hobert Oliver1

Affiliation:

1. Department of Biochemistry and Molecular Biophysics, Center for Neurobiology and Behavior, Columbia University, College of Physicians and Surgeons, New York, NY 10032, USA.

2. Center for C. elegans Anatomy, Albert Einstein College of Medicine, Department of Neuroscience, Bronx, NY 10461, USA.

Abstract

During development, neurons extend axons along defined routes to specific target cells. We show that additional mechanisms ensure that axons maintain their correct positioning in defined axonal tracts. After termination of axonal outgrowth and target recognition, axons in the ventral nerve cord (VNC) of Caenorhabditis elegans require the presence of a specific VNC neuron, PVT, to maintain their correct positioning in the left and right fascicles of the VNC. PVT may exert its stabilizing function by the temporally tightly controlled secretion of 2-immunoglobulin (Ig)–domain proteins encoded by the zig genes. Dedicated axon maintenance mechanisms may be widely used to ensure the preservation of functional neuronal circuitries.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference23 articles.

1. R. M. Durbin thesis University of Cambridge Cambridge UK (1987).

2. In their electron microscopical reconstruction of the nervous system White et al. had lost the tracking of the PVT axon in the posterior half of the animal (18 19). Using several independent gfp reporters we could show that the axon of PVT extends into the nerve ring. Another update to the White et al. report (18) is Durbin's finding that PVPR and not PVPL extends along the left side of the VNC (1).

3. Neuroglia and Pioneer Neurons Express UNC-6 to Provide Global and Local Netrin Cues for Guiding Migrations in C. elegans

4. Role of netrin UNC-6 in patterning the longitudinal nerves ofCaenorhabditis elegans

5. P. Sonderegger Ed. Ig Superfamily Molecules in the Nervous System (Harwood Academic Amsterdam 1998).

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