Expression of the Xvax2 gene demarcates presumptive ventral telencephalon and specific visual structures in Xenopus laevis.
Mech Dev
; 100(1): 115-8, 2001 Jan.
Article
en En
| MEDLINE
| ID: mdl-11118895
ABSTRACT
vax2 is a recently isolated homeobox gene, that plays an important role in controlling the dorso-ventral patterning of the retina. In this paper we present a thorough description of the Xvax2 expression pattern all along Xenopus embryogenesis, and compare this pattern in detail to that shown by Xvax1b and Xpax2, two genes also involved in ventral eye development. At early neurula stages, while Xpax2 starts to be expressed within the eye field, both Xvax2 and Xvax1b are exclusively activated in the presumptive ventral telencephalon. Since midneurula stages, Xvax2 and Xvax1b are also transcribed in the medial aspect of the eye field. At tailbud and tadpole stages, Xvax2, Xvax1b and Xpax2 expression overlaps in the optic stalk and nerve and in the optic disk, while Xvax2 and Xvax1b also display specific activation domains in the ventral retina as well as in the ventral telencephalon and diencephalon. Finally, during metamorphosis a high level of both Xvax2 and Xvax1b transcription is maintained in the optic chiasm. In addition, Xvax1b is transcribed in the ventral hypothalamus and in the hypophysis, whereas a strong Xvax2 expression is retained in the ventral portion of the mature retina.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Retina
/
Telencéfalo
/
Xenopus laevis
/
Proteínas de Homeodominio
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Proteínas de Xenopus
/
Ojo
Límite:
Animals
Idioma:
En
Revista:
Mech Dev
Asunto de la revista:
EMBRIOLOGIA
Año:
2001
Tipo del documento:
Article