Women who use borrowed eggs to have children pass on fetal parts and their own genetic material, a study published in the journal Development found.
Until now, experts believed that fertilized eggs contained only the DNA of the egg and sperm from which they came. However, it seems that they also contain a part of the DNA from the person who will conceive. This was discovered in the case of in vitro fertilization with borrowed eggs.
This is a truly amazing discovery, which obviously matters to the health of the fetus.
The DNA is transmitted before the egg is implanted in the wall of the uterus, through the endometrial fluid which contains fragments of the mother’s genetic material. The finding means that in some way the embryos absorb genetic material from the uterus and this is described as “amazing”.
The finding may alleviate some of the infertile women who have children on loan eggs and are upset believing that their baby has nothing of their own. This is not because their babies, even though they will come from a foreign egg, will carry a small portion of their own DNA.
Positive and negative results
The study involved 10 women who had visited a fertility clinic in Spain.
The scientists located fragments of women’s DNA in the fluid of the endometrium (the inner wall of the uterus) and with laboratory experiments confirmed that they are absorbed by the embryos in the phase before implantation in the endometrium, which is necessary for further development.
That is, “there is an exchange between the uterus and the fetus, which until now was not known,” said lead researcher Felipe Villegia. He added: “It is too early to talk about the effects this has on health, but there will probably be both positives and negatives. In each case, they have seized it, despite obstacles we can scarcely imagine. “