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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of monoclonal nonspecific suppressor factor beta (mNSFbeta) as one of the genes differentially expressed at implantation sites compared to interimplantation sites in the mouse uterus.

Successful implantation requires synchronous development of and active dialogue between the maternal endometrium and the implanting blastocyst. While it is well established that appropriate maternal steroid hormones are essential for endometrial preparation for implantation, the molecular events at the actual site of implantation are still little understood. The aims of our studies were to identify genes explicitly expressed or repressed at the sites of implantation by utilising RNA differential display (DDPCR), and to establish the roles of these genes in the implantation process in a mouse model. Ten bands unique in implantation sites compared to interimplantation sites were identified by DDPCR and subsequently confirmed by Northern blotting. One of these bands contained a cDNA fragment that was highly homologous to mouse monoclonal nonspecific suppressor factor beta (MNSFbeta) or Fau. The full cDNA sequence of this gene, obtained by screening a lambdagt11 cDNA library, was essentially the same as MNSFbeta, except that it had much longer 5' untranslated region. Interestingly, both Northern and immunohistochemical analysis showed that the expression of this gene was much lower in implantation sites compared to interimplantation sites on day 4.5 of pregnancy, when embryos first attach to the uterus and initiate implantation, and on day 5.5, when implantation has advanced. These results suggest a role for MNSF during implantation and early pregnancy, possibly through regulating the proliferation and/or differentiation of uterine stromal cells. It may also be involved in the selective production of TH2-type cytokines in implantation sites to regulate the immune system at the maternal-fetal interface.[1]


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