Tomoya Matsuno

Learn More
In the E4 (embryonic day 4) chick tectal primordium, engrailed expression is strong at the caudal end and gradually weakens toward the rostral end. We used quail-chick chimeric tecta to investigate how the caudorostral gradient of engrailed expression is established and whether it is correlated with the subsequent rostrocaudal polarity of tectal(More)
The optic tectum receives retinal fibers in a topographically ordered manner. For the formation of the precise connections, the tectum is believed to be positionally specified by gradients of molecules along axes. Rostrocaudal polarity of the tectum is first detectable at embryonic day 2 (E2) in the chick, by the caudorostral gradient of en expression, then(More)
We excised the dorsal part of the optic vesicle of chick embryos at stages 13-14 (embryonic day 2). The remainder of the optic vesicle reoganized and developed a small eye. This study was undertaken to determine how locus specificity is kept within the reorganized retina. The projection pattern from the reorganized eyes was examined with HRP and DiI, a(More)
In a previous report, we demonstrated that the exposure of cultured mouse cerebellar granule cells to permethrin, a type I pyrethroid insecticide, repressed the induction of activity-dependent c- fos and brain-derived neurotrophic factor (BDNF) gene expression, accompanying a decrease in Ca(2+) influx into neurons. In addition, it has been suggested that(More)
Transplantation of the quail tectum primordia after rotation of its rostrocaudal axis through 180 degrees into a chick embryo was carried out at around the 10-somite stage. Our previous study showed that the rostrocaudal specificity was not determined at the stage when the transplantation was carried out in view of the retinotectal map formation. Here, we(More)
Retinotectal projection is precisely organized in a retinotopic manner. In normal projection, temporal retinal axons project to the rostral part of the tectum, and nasal axons to the caudal part of the tectum. The two-dimensional relationship between the retina and the tectum offers a useful experimental system for analysis of neuronal target recognition.(More)
Circannual pupation timing is not correlated with circadian period in the varied carpet beetle Anthrenus verbasci Anthrenus verbasci (Insecta, Coleoptera, Dermestidae) shows a circannual rhythm in pupation and a circadian rhythm in adult locomotor activity. The period length of the circannual rhythm will be correlated with the length of a circadian period(More)
Polarity and its plasticity in the avian mesencephalon and the retina are reviewed. Rostrocaudal polarity of the tectum (dorsal mesencephalon) is revealed by the gradient of engrailed gene expression, by its cytoarchitecture, and by positional specification of tectal cells which retinal fibers read to find their targets. In the ventral mesencephalon, the(More)
In phytophagous insects, in spite of some general advantages of oviposition on a vital part of their host food plants, certain species prefer dead tissues for oviposition. In the present study, we examined oviposition-related behaviors of a cicada, Cryptotympana facialis (Walker), which lays eggs exclusively into dead twigs. From behavioral observation of(More)