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Journal Article
Research Support, Non-U.S. Gov't
A sister of NANOG regulates genes expressed in pre-implantation human development.
Open Biology 2017 April
The NANOG homeobox gene plays a pivotal role in self-renewal and maintenance of pluripotency in human, mouse and other vertebrate embryonic stem cells, and in pluripotent cells of the blastocyst inner cell mass. There is a poorly studied and atypical homeobox locus close to the Nanog gene in some mammals which could conceivably be a cryptic paralogue of NANOG, even though the loci share only 20% homeodomain identity. Here we argue that this gene, NANOGNB (NANOG Neighbour) , is an extremely divergent duplicate of NANOG that underwent radical sequence change in the mammalian lineage. Like NANOG , the NANOGNB gene is expressed in pre-implantation embryos of human and cow; unlike NANOG , NANOGNB expression is restricted to 8-cell and morula stages, preceding blastocyst formation. When expressed ectopically in adult cells, human NANOGNB elicits gene expression changes, including downregulation of a set of genes that have an expression pulse at the 8-cell stage of pre-implantation development. We conclude that gene duplication and massive sequence divergence in mammals generated a novel homeobox gene that acquired new developmental roles complementary to those of Nanog.
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