Molecular cloning and characterization of murine cyclin E.

Using a monoclonal antibody developed to a mouse trophectodermal carcinoma stem cell line E6496D lysate, we have identified the gene that encodes murine cyclin E. The cDNA contains a consensus cyclin box and a long 3' untranslated region and shares over 75% homology with human cyclin E cDNA. We show that the gene is expressed in fetal tissues, embryonal carcinoma F9 cells and yolk sac carcinoma PYS-2 cells, but is not expressed in preimplantation stages of development. In adult tissues, cycE mRNA is detectable in the spleen and to a lesser extent in the testis and brain. These data show that cycE is developmentally regulated and unevenly expressed in fetal and adult mouse tissues.