Donor 7042 carries defective gene known as 2009 ( NF1 ) Ten of the donor 's offspring have already been diagnosed with NF1 . Can increase risk of cancer , cause learning difficulties and reduce lifespan . Four families are suing the Nordic Cryobank that supplied the sperm .
Donor 7042 carries defective gene known as neurofibromatosis 1 ( NF1 ) Ten of the donor 's offspring have already been diagnosed with NF1 . Can increase risk of cancer , cause learning difficulties and reduce lifespan . Four families are suing the Nordic Cryobank that supplied the sperm .