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The size of the penis has reportedly increased in recent years. Good news? It seems not! This La Santé podcast on Listen to you explains the consequences that the size of the genital tract can have on health and reproduction. © Futura
The affair broke out a few years ago, but it deserves to be remembered as its implications are important for sperm banks on a global scale. Between 2006 and 2022, an anonymous Danish donor, known under the pseudonym “Kjeld”, provided his sperm to the European Sperm Bank, based in Denmark.
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Result: 197 children were born in 14 different countries thanks to his donations. But the discovery of a rare mutation in the TP53 gene in this donor has since cast a worrying shadow over these births.
The TP53 gene: a key player in the fight against cancer
To understand the gravity of the situation, we must first understand the fundamental role of the TP53 gene in our body. This gene produces the protein p53, which scientists call the “guardian of the genome.”
Concretely, this protein fulfills three essential functions:
- She constantly monitors theADN of each cell.
- It blocks cell division when damage is detected.
- It decides either to repair the damaged DNA or to trigger the death of the cell concerned.
When the TP53 gene mutates, the p53 protein becomes defective. The cells with damaged DNA can then multiply freely, forming tumors cancerous. However, the mutation carried by “Kjeld” was not a classic mutation of the TP53 gene: it was a rare variant, never described before according to the European Sperm Bank.
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Disturbing fact: this anomalies was only found in a fraction of his sperm, not his entire body. The donor himself has not developed any cancer. It is precisely this localized character which made its detection so difficult during screenings prior to donation.
Reproductive medicine, as sophisticated as it may be, is only in its infancy. This rare variant of the TP53 gene, never observed before, only affects part of the sperm and not the rest of the donor’s body, which explains why he himself is not affected. © Morsa Images, iStock
When a child’s dream comes up against genetic risks
Denmark is home to the European Sperm Bank, one of the largest in the world. The Scandinavian country is a major player in the donation of gametes on an international scale. It is in this context that between 2006 and 2022, sperm from “Kjeld” was distributed to 67 clinics in 14 countries, allowing the birth of 99 children in Denmark and 98 others abroad.
The first signal alert occurred in April 2020: the bank was informed that a child from these donations had developed cancer and carried a genetic mutation. Three years later, a second similar case was reported. These two alerts triggered an in-depth analysis of the donor’s stored sperm, revealing the previously invisible TP53 mutation.
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As a reminder, theinfertilité affects between 15 and 25% of French couples, according to an Inserm report published in 2019. Faced with this reality, sperm donation represents a valuable solution for many families. But this case raises a crucial question: protocols screening génétique are they sufficiently robust to identify such localized and rare mutations?
Not all children born from this donor’s sperm have inherited this genetic anomaly. Some carry the mutation, others do not. This variability does not, however, reduce the urgency of rigorous medical monitoring for each of them.
This case reminds us that reproductive medicine, however advanced it may be, remains confronted with the limits of genetic screening in the face of the rarest and most localized mutations.
