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Ovarian tumors are formed either in the absence of Bam (bag-of-marbles) in germ-line cells or the overexpression of Dpp (decapentaplegic) in ovarian somatic cells. These tumor cells contain spectrosomes characteristic of ovarian germ-line stem cells and the immediate descendents called cystoblasts. We show that pole cells can successfully populate the gonad after transplantation to the dorsal mesoderm of host embryos following germ-band extension. By using this approach, we demonstrate that bam- cells can populate the gonad and become established as germ-line stem cells. Tumor cells containing the wild-type bam gene under heat shock transcriptional control are able to produce functional oocytes. Thus, stem cells/cystoblasts of the adult ovary are capable of forming stem cells in the embryonic ovary and recapitulating the development of the female germ line.

Ovarian cystocytes can repopulate the embryonic germ line and produce functional gametes