Retinal axon guidance by region-specific cues in diencephalon - PubMed (original) (raw)
. 1998 Mar;125(5):791-801.
doi: 10.1242/dev.125.5.791.
Affiliations
- PMID: 9449662
- DOI: 10.1242/dev.125.5.791
Retinal axon guidance by region-specific cues in diencephalon
R Tuttle et al. Development. 1998 Mar.
Abstract
Retinal axons show region-specific patterning along the dorsal-ventral axis of diencephalon: retinal axons grow in a compact bundle over hypothalamus, dramatically splay out over thalamus, and circumvent epithalamus as they continue toward the dorsal midbrain. In vitro, retinal axons are repulsed by substrate-bound and soluble activities in hypothalamus and epithalamus, but invade thalamus. The repulsion is mimicked by a soluble floor plate activity. Tenascin and neurocan, extracellular matrix molecules that inhibit retinal axon growth in vitro, are enriched in hypothalamus and epithalamus. Within thalamus, a stimulatory activity is specifically upregulated in target nuclei at the time that retinal axons invade them. These findings suggest that region-specific, axon repulsive and stimulatory activities control retinal axon patterning in the embryonic diencephalon.
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