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The Journal of Neuroscience, November 1, 2001, 21(21):8548-8563
Topographic-Specific Axon Branching Controlled by Ephrin-As Is
the Critical Event in Retinotectal Map Development
Paul A.
Yates,
Adina L.
Roskies,
Todd
McLaughlin, and
Dennis D. M.
O'Leary
Molecular Neurobiology Laboratory, The Salk Institute, La Jolla,
California 92037
The retinotectal projection is the predominant model for studying
molecular mechanisms controlling development of topographic axonal
connections. Our analyses of topographic mapping of retinal ganglion
cell (RGC) axons in chick optic tectum indicate that a primary role for
guidance molecules is to regulate topographic branching along RGC
axons, a process that imposes unique requirements on the molecular
control of map development. We show that topographically appropriate
connections are established exclusively by branches that form along the
axon shaft. Initially, RGC axons overshoot their appropriate
termination zone (TZ) along the anterior-posterior (A-P) tectal axis;
temporal axons overshoot the greatest distance and nasal axons the
least, which correlates with the nonlinear increasing A-P gradient of
ephrin-A repellents. In contrast, branches form along the shaft of RGC
axons with substantial A-P topographic specificity. Topography is
enhanced through the preferential arborization of appropriately
positioned branches and elimination of ectopic branches. Using a
membrane stripe assay and time-lapse microscopy, we show that branches
form de novo along retinal axons. Temporal axons
preferentially branch on their topographically appropriate anterior
tectal membranes. After the addition of soluble EphA3-Fc, which blocks
ephrin-A function, temporal axons branch equally on anterior and
posterior tectal membranes, indicating that the level of ephrin-As in
posterior tectum is sufficient to inhibit temporal axon branching and
generate branching specificity in vitro. Our findings
indicate that topographic branch formation and arborization along RGC
axons are critical events in retinotectal mapping. Ephrin-As inhibit
branching along RGC axons posterior to their correct TZ, but alone
cannot account for topographic branching and must cooperate with other
molecular activities to generate appropriate mapping along the A-P
tectal axis.
Key words:
axon guidance; axon repellents; branch inhibition; chick; Eph receptors; EphA3-Fc; gradients; membrane stripe assay; time-lapse
imaging; topographic maps
Copyright © 2001 Society for Neuroscience 0270-6474/01/21218548-16$05.00/0
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