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The Journal of Neuroscience, May 16, 2007, 27(20):5271-5279; doi:10.1523/JNEUROSCI.0883-07.2007

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Cellular/Molecular
Genetic Single-Cell Mosaic Analysis Implicates ephrinB2 Reverse Signaling in Projections from the Posterior Tectum to the Hindbrain in Zebrafish

Tomomi Sato,¹  Takanori Hamaoka,¹ Hidenori Aizawa,¹ Toshihiko Hosoya,² and Hitoshi Okamoto¹

¹Laboratory for Developmental Gene Regulation and ²Hosoya Research Unit, Brain Science Institute, RIKEN, Wako, Saitama 351-0198, Japan

Correspondence should be addressed to Hitoshi Okamoto, Laboratory for Developmental Gene Regulation, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan. Email: hitoshi{at}brain.riken.jp

The optic tectum is a visual center in vertebrates. It receives topographically ordered visual inputs from the retina in the superficial layers and then sends motor outputs from the deeper layers to the premotor reticulospinal system in the hindbrain. Although the topographic patterns of the retinotectal projection are well known, it is not yet well understood how tectal efferents in the tectobulbar tract project to the hindbrain. The retinotectal and the tectobulbar projections were visualized in a zebrafish stable transgenic line Tg(brn3a-hsp70:GFP). Using a single-neuron labeling system in combination with the cre/loxP and Gal4/UAS systems, we showed that the tectal neurons that projected to rhombomeres 2 and 6 were distributed with distinctive patterns along the anterior–posterior axis. Furthermore, we found that ephrinB2a was critically involved in increasing the probability of neurons projecting to rhombomere 2 through a reverse signaling mechanism. These results may provide a neuroanatomical and molecular basis for the motor command map in the tectum.

Key words: zebrafish; tectobulbar projection; Cre/loxP; Gal4/UAS; ephrinB; reverse signaling

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Received Sept. 1, 2006; revised April 9, 2007; accepted April 9, 2007.

Correspondence should be addressed to Hitoshi Okamoto, Laboratory for Developmental Gene Regulation, Brain Science Institute, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan. Email: hitoshi{at}brain.riken.jp

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