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The Journal of Neuroscience, August 1, 2000, 20(15):5802-5812
Neocortical Origin and Tangential Migration of Guidepost Neurons
in the Lateral Olfactory Tract
Naomi
Tomioka1,
Noriko
Osumi2,
Yasufumi
Sato1, 3,
Takayoshi
Inoue4,
Shun
Nakamura4,
Hajime
Fujisawa1, 5, and
Tatsumi
Hirata3, 5, 6
1 Division of Biological Science, Nagoya University
Graduate School of Science, Chikusa-ku, Nagoya 464-8602, Japan,
2 Department of Developmental Neurobiology, Tohoku
University Graduate School of Medicine, Aoba-ku, Sendai 980-8575, Japan, 3 Division of Brain Function, National Institute of
Genetics, Mishima 411-8540, Japan, 4 Division of
Biochemistry and Cellular Biology, National Institute of Neuroscience,
Kodaira 187-8501, Japan, 5 Core Research for Evolution
Science and Technology, and 6 Precursory Research for
Embryonic Science and Technology, Japan Science and Technology
Corporation (JST), Kawaguchi 332-0012, Japan
The early-generated neurons designated as lot cells specifically
mark the future site of the lateral olfactory tract (LOT) and guide LOT
axons. We investigated the mechanism of how lot cells develop and get
localized in the LOT position. Lot cells differentiated from
neuroepithelial cells in all regions of the neocortex but not from
those in the ganglionic eminence in culture. Cell tracing analyses
demonstrated that lot cells generated from the neocortex subsequently
followed a tangential migration stream ventrally toward the LOT
position. Mutant mouse embryos lacking the function of transcription
factor Gli3 showed disturbances of the migration stream and
translocation of lot cells in the dorsal telencephalon. These results
reveal a new type of neuronal migration in the telencephalon and
introduce an unexpected dramatic feature of the earliest
regionalization of the telencephalon.
Key words:
migration; neurogenesis; guidepost; lot cell; Gli3; Xt
Copyright © 2000 Society for Neuroscience 0270-6474/00/20155802-11$05.00/0
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