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XB-ART-14978
Mech Dev April 1, 1998; 73 (1): 73-83.

The Xenopus Emx genes identify presumptive dorsal telencephalon and are induced by head organizer signals.

Pannese M , Lupo G , Kablar B , Boncinelli E , Barsacchi G , Vignali R .


Abstract
We have isolated and studied the expression pattern of Xemx1 and Xemx2 genes in Xenopus laevis. Xemx genes are the homologues of mouse Emx genes, related to Drosophila empty spiracles. They are expressed in selected regions of the developing brain, particularly in the telencephalon, and, outside the brain, in the otic vesicles, olfactory placodes, visceral arches and the developing excretory system. We also report on experiments concerning the tissue and molecular signals responsible for their activation in competent ectoderm. Xemx genes are activated in ectoderm conjugated with head organizer tissue, but not with tail organizer tissue. Furthermore, they are not activated in animal cap either by noggin or by Xnr3, thus suggesting that a different inducer or the integration of several signals may be responsible for their activation.

PubMed ID: 9545539
Article link: Mech Dev

Genes referenced: dlx5 emx1l emx2 nodal3.1 nodal3.2 nog otx2


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