Scientists in America are theorizing that low sperm count or a total absence of sperm may be caused by a fault in the genes where germ cells are either not present or fail to release in the correct manner (think of the word germinate and the process which happens with flowers; a similar process is needed to be triggered by germ cells before sperm can be produced).

Researchers are hoping to replace non-functioning germ cells with new ones to enable men to start producing sperm.

They collected bone marrow stem cells from infertile mice who had been made infertile either by chemicals or genetic manipulation and injected these cells into their testes. These cells then developed the properties of germ cells and managed to survive in the testes for 12 weeks.

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