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Interaction between Oct3/4 and Cdx2 determines trophectoderm differentiation.

Hitoshi Niwa¹, Yayoi Toyooka, Daisuke Shimosato

¹Laboratory for Pluripotent Cell Studies, RIKEN Center for Developmental Biology (CDB), 2-2-3 Minatojima-minamimachi, Kobe, Hyogo 650-0047, Japan. niwa@cdb.riken.jp

|December 6, 2005

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Caudal-related homeobox 2 (Cdx2) overexpression can generate trophoblast stem cells. Cdx2 is essential for stem cell self-renewal and reciprocal inhibition with Oct3/4 may drive early mammalian development.

Area of Science:

Developmental Biology
Stem Cell Biology
Genetics

Background:

Trophectoderm (TE) forms the placenta, a key mammalian structure.
Molecular mechanisms of TE differentiation, the first lineage event, are unclear.
Embryonic stem (ES) cells differentiate into TE upon Oct3/4 repression.

Purpose of the Study:

Investigate molecular mechanisms of early mammalian differentiation.
Determine the role of Caudal-related homeobox 2 (Cdx2) in TE formation.
Elucidate the interaction between Cdx2 and Oct3/4 in lineage specification.

Main Methods:

Overexpression of Cdx2 in ES cells.
Analysis of trophoblast stem (TS) cell generation and self-renewal.
Investigating Cdx2 and Oct3/4 complex formation and target gene repression in ES cells.

Related Experiment Videos

Main Results:

Cdx2 overexpression successfully generated trophoblast stem cells.
Cdx2 is dispensable for TE differentiation induced by Oct3/4 repression.
Cdx2 is essential for trophoblast stem cell self-renewal.
Cdx2 and Oct3/4 form a complex in preimplantation embryos, repressing target genes.

Conclusions:

Cdx2 is sufficient for generating trophoblast stem cells.
Reciprocal inhibition between transcription factors like Cdx2 and Oct3/4 may orchestrate early mammalian lineage decisions.