Team produces sperm from mice stem cells

TOKYO – A team of scientists has produced viable sperm from the stem cells of mice in an experiment that could be a breakthrough toward treating infertile humans, according a new study.

The Kyoto University researchers managed to induce mice stem cells into creating sperm precursors, which were transplanted into infertile male mice. The mice then produced sperm that was used to fertilize eggs in vitro.

The offspring were healthy and fertile, according to a paper published online Thursday in the Cell, an academic journal.

Members of the research team, led by Mitinori Saitou, said they believe their success may help in the development of infertility treatments in humans, although they said many hurdles remain.