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Journal Article
Research Support, Non-U.S. Gov't
Identification of an enhancer that controls up-regulation of fibronectin during differentiation of embryonic stem cells into extraembryonic endoderm.
Journal of Biological Chemistry 2005 Februrary 26
The extraembryonic endoderm is derived from inner cell mass cells of the blastocyst during early mouse embryogenesis. Formation of the extraembryonic endoderm, which later contributes to the yolk sac, appears to be a prerequisite for subsequent differentiation of the inner cell mass. While embryonic stem cells can be induced to differentiate into extraembryonic endoderm cells in vitro, the molecular mechanisms underlying this process are poorly understood. We used a promoter trap approach to search for genes that are expressed in embryonic stem cells and are highly up-regulated during differentiation to the extraembryonic endoderm fate. We showed that fibronectin fits this expression profile. Moreover we identified an enhancer in the 12th intron of the fibronectin locus that recapitulated the endogenous pattern of fibronectin expression. This enhancer carries Sox protein-binding sequences, and our analysis demonstrated that Sox7 and Sox17, which are highly expressed in the extraembryonic endoderm, were involved in enhancer activity.
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