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First published online July 5, 2007
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2007-0126v1
25/10/2534    most recent
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Submitted on February 14, 2007
Accepted on June 23, 2007

EMBRYONIC STEM CELLS

A Heterogeneous Expression Pattern for Nanog in Embryonic Stem Cells

Amar M. Singh 1, Takashi Hamazaki 1, Katherine E. Hankowski 1, Naohiro Terada 1*

1 Department of Pathology, University of Florida College of Medicine, Gainesville, FL 32610, USA

* To whom correspondence should be addressed. E-mail: terada{at}pathology.ufl.edu.


  Abstract

Nanog is a critical homeodomain factor responsible for maintaining embryonic stem (ES) cell self-renewal and pluripotency. Of interest, Nanog expression is not homogeneous in the conventional culture of murine ES cells. A Nanog-high population expresses markers for pluripotent ES cells, whereas a Nanog-low population expresses markers for primitive endoderm, such as Gata6. Since the inner cell mass of early blastocysts has recently been reported to be heterogeneous in terms of Nanog and Gata6 expression, ES cells appear to closely resemble the developing stage from which they originate. We further demonstrate that Nanog can directly repress Gata6 expression through its binding to the proximal promoter region of the Gata6 gene, and that overexpression of Nanog reduces heterogeneity during ES cell maintenance. Interestingly, Nanog heterogeneity does not correlate with the heterogeneous expression of SSEA1, suggesting multiple but overlapping levels of heterogeneity may exist in ES cells. These findings provide insight into the factors that control ES cell self-renewal and the earliest lineage commitment to primitive endoderm, while also suggesting methods to promote homogeneity during ES cell maintenance.

Key Words. Embryonic stem cells, Nanog, Gata6, heterogeneity, primitive endoderm




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