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Loss of Dnd1 facilitates the cultivation of genital ridge-derived rat embryonic germ cells
Authors:Northrup Emily  Eisenblätter Regina  Glage Silke  Rudolph Cornelia  Dorsch Martina  Schlegelberger Brigitte  Hedrich Hans-Jürgen  Zschemisch Nils-Holger
Institution:aInstitute of Laboratory Animal Science, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany;bInstitute of Cell and Molecular Pathology, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
Abstract:Pluripotent cells referred to as embryonic germ cells (EGCs) can be derived from the embryonic precursors of the mature gametes: the primordial germ cells (PGCs). A homozygous mutation (ter) of the dead-end homolog 1 gene (Dnd1) in the rat causes gonadal teratocarcinogenesis and sterility due to neoplastic transformation and loss of germ cells. We mated heterozygous ter/+ WKY-Dnd1ter/Ztm rats and were able to cultivate the first genital ridge-derived EGCs of the rat embryo at day 14.5 post coitum (pc). Genotyping revealed that ten EGC lines were Dnd1 deficient, while only one wild type cell line had survived in culture. This suggests that the inactivation of the putative tumor suppressor gene Dnd1 facilitates the immortalization of late EGCs in vitro. Injection of the wild type EGCs into blastocysts resulted in the first germ-line competent chimeras. These new pluripotent rat EGCs offer an innovative approach for studies on germ cell tumor development as well as a new tool for genetic manipulations in rats.
Keywords:Embryonic germ cell  Primordial germ cell  Rat  Dnd1  Teratoma  Germ-line competent chimera
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