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First published online 1 March 2006
doi: 10.1242/dev.02290

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Pax6-dependent boundary defines alignment of migrating olfactory cortex neurons via the repulsive activity of ephrin A5

¹ Division of Developmental Neuroscience, Center for Translational and Advanced Animal Research (CTTAR), Tohoku University School of Medicine, 2-1, Seiryo-machi, Aoba-ku, 980-8575, Japan.
² Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden.
³ Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi, 332-0012, Japan.

^* Author for correspondence (e-mail: osumi{at}mail.tains.tohoku.ac.jp)

Accepted 18 January 2006

Neuronal migration is a prerequisite event for the establishment of highly ordered neuronal circuits in the developing brain. Here, we report Pax6-dependent alignment of the olfactory cortex neurons in the developing telencephalon. These neurons were generated in the dorsal part of telencephalon, migrated ventrally and stopped at the pallium-subpallium boundary (PSB). In Pax6 mutant rat embryos, however, these neurons invaded the ventral part of the telencephalon by crossing the PSB. Ephrin A5, one of the ligands for EphA receptors, was specifically expressed in the ventral part of the telencephalon, and its expression level was markedly reduced in the Pax6 mutant. Gain- and loss-of-function studies of ephrin A5 indicated that ephrin A5 plays an important role in the alignment of olfactory cortex neurons at the PSB. Our results suggest that Pax6-regulated ephrin A5 acts as a repulsive molecule for olfactory cortex neurons in the developing telencephalon.

Key words: Neural patterning, Neuronal migration, Telencephalon, Pax6, Ephrin A5

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