Sperm donor with cancer-causing gene fathered nearly 200 children

The donor and his family were healthy, and not aware of any problem. He also did not inherit the mutation, but developed it spontaneously in some cells before he was born. [...] ‘Each sperm in an ejaculate is slightly different so screening these is also not simple – though if a child is born with a condition the screening sperm approach can be used to tell if a risk like this exists.

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