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Early mammillary pouch specification in the course of prechordal ventralization of the forebrain tegmentum.

Abstract：

:The mammillary body, a ventral specialization of the caudal hypothalamus, lies close to the transition between epichordal and prechordal parts of the forebrain (Puelles and Rubenstein, 2003). This report examines its presumed causal connection with either prechordal or notochordal mesodermal induction, as well as the timing of its specification, in the context of early ventral forebrain patterning. It was recently found that the ephrin receptor gene EphA7 is selectively expressed in the mammillary pouch from early stages of development (HH14: García-Calero et al., 2006). We used mammillary EphA7 expression as well as ventral hypothalamic expression of the gene markers Nkx2.1 and Shh to analyze experimental effects on mammillary specification and morphogenesis after axial mesoderm ablation at stages HH4+ to HH6. Progressively delayed ablation of the prechordal plate revealed its sequential implication in molecular specification of the entire ventral forebrain, including the mammillary and tuberal regions of the hypothalamus. We observed differential contact requirements for induction by the prechordal plate of all the forebrain regions expressing Shh and Nkx2.1, including distant subpallial ones. In contrast, ablation of the anterior notochordal tip at these stages did not elicit significant patterning changes, particularly no effects on mammillary EphA7 expression or mammillary pouch development.

journal_name

Dev Biol

journal_title

Developmental biology

authors

García-Calero E,Fernández-Garre P,Martínez S,Puelles L

doi

10.1016/j.ydbio.2008.05.545

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

366-77

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(08)00910-X

journal_volume

320

pub_type

杂志文章

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