nodal expression in the primitive endoderm is required for specification of the anterior axis during mouse gastrulation

被引:0
|
作者
Varlet, I [1 ]
Collignon, J [1 ]
Robertson, EJ [1 ]
机构
[1] HARVARD UNIV,DEPT MOL & CELLULAR BIOL,CAMBRIDGE,MA 02138
来源
DEVELOPMENT | 1997年 / 124卷 / 05期
关键词
nodal; mouse gastrulation; primitive endoderm; chimeras;
D O I
暂无
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Mouse nodal, a member of the TGF beta family of secreted growth factors is essential for gastrulation. We recently generated a nodal(lacz) reporter allele by homologous recombination in ES cells. In the present study, beta-galactosidase staining in the perigastrulation-stage embryo has demonstrated the site of highest nodal expression is localised to the prospective posterior region of the epiblast marking the site of primitive streak formation. We also documented transient nodal.lacZ expression in the visceral endoderm prior to and during early streak formation. A mosaic analysis using wild-type ES cells to rescue nodal-deficient embryos allowed us to document functionally distinct nodal activities in the embryonic ectodermal and primitive endodermal cell lineages. nodal signaling in the ectoderm is necessary for primitive streak formation as the gastrulation defect of nodal-deficient embryos can be rescued by the inclusion of small numbers of wild-type cells. In addition, we show that chimeric embryos composed of nodal-deficient primitive endoderm fail to develop rostral neural structures. Thus we conclude that the action of nodal, a TGF beta-related growth factor expressed in the primitive endoderm, is critical for patterning of the anterior aspects of the A-P axis.
引用
收藏
页码:1033 / 1044
页数:12
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