The sperm of a man with a rare genetic mutation linked to cancer was used to conceive at least 67 children, with 10 of them later diagnosed with cancer. This situation raises concerns over the absence of universally accepted guidelines regarding donor sperm usage.
Experts have warned about the social and psychological implications of a single donor fathering many children across various nations. This specific case, involving numerous children born between 2008 and 2015, underscores the difficulties in tracing families when a significant medical issue arises.
Dr. Edwige Kasper, a biologist from Rouen university hospital in France, emphasized the need for a European limit on how many families a single donor can contribute to. She pointed out that while whole-genome sequencing is not feasible for all sperm donors, the widespread spread of genetic diseases is unusual. After all, not every man has 75 children across Europe.
Concerns about this case surfaced when two families reached out to their fertility clinics regarding illnesses in their children that seemed connected to a rare genetic variant. The European Sperm Bank confirmed that this variant, found in a gene called TP53, was indeed present in some of the donor’s sperm.
At the time of the sperm donation in 2008, this rare variant was not known to be associated with cancer, and standard screening methods would not have detected it. It seems the donor is currently healthy, but Kasper’s analysis suggested that the mutation could potentially lead to Li-Fraumeni syndrome, a serious hereditary cancer risk.
Dr. Kasper utilized various databases, predictive tools, and functional trial results to conclude that the variant might cause cancer, recommending that children born from this donor undergo genetic counseling.
As related research was conducted across various genetics and pediatric departments in Europe, a total of 67 children from 46 families across eight European countries were tested. The genetic variant was identified in 23 children, with 10 diagnosed with different types of cancer, including leukemia and non-Hodgkin lymphoma.
Children found to carry this risk gene are advised to undergo regular MRI scans and ultrasounds as they grow up, to monitor potential health issues.
The European Sperm Bank, which generally limits each donor to 75 families, noted that more than 67 children have been conceived using this donor’s sperm but doesn’t specify the exact number for any particular donor. They claim that all involved clinics have been notified.
Dr. Kasper expressed ongoing concern over this situation, noting that it’s unclear if 67 is the total number of births for this donor, as the sperm bank was hesitant to disclose such figures.
Professor Nicky Hudson from De Montfort University in Leicester pointed out the complexities associated with using donor gametes shipped across borders for many recipients. She reaffirmed that limiting the number of children per donor to one country could significantly mitigate the potential fallout and challenges when it comes to tracing families.
Although these scenarios have been relatively uncommon, Hudson stressed the importance of coordinating international practices to prevent similar occurrences in the future, alongside better tracking systems for donors and informing recipients.
Julie Paulli Budtz, a representative from the European Sperm Bank, expressed their deep concern about this case. She noted that the donor had undergone rigorous testing, but it’s impossible to detect disease-causing mutations without specific knowledge beforehand. She welcomed the ongoing discussion about establishing an internationally mandated family limit, which her organization has actively supported by enforcing an internal limit of 75 families per donor.
