Donor 7042 carries defective gene known as neurofibromatosis 1 ( NF1 ) Ten of the donor 's offspring have already been diagnosed with NF1 . The other two children are healthy and don't carry a defect in their DNA, but they also lack any type of brain tissue that would be affected by this disease. 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 .