Frozen Embryo Transfers May More Closely Resemble Natural Pregnancies, Study Suggests

Could This ART Method Be a Safer Option?

Infertility affects approximately one in six couples in the U.S., leading many to seek assistance through assisted reproductive technology (ART). While ART has helped millions conceive, some studies suggest a slightly increased risk of certain health issues in ART-conceived children.

Now, new research from the University of Helsinki and Helsinki University Hospital offers intriguing insights into the potential differences between various ART methods and their impact on early progress.

“The placenta is a fascinating organ that connects the mother and fetus,mediating environmental effects and influencing fetal development,” explains Associate Professor Nina Kaminen-Ahola,the study’s lead researcher. “It provides a unique window into the very early stages of development, wich are or else challenging to study in humans.”

One key finding focused on the two common ART methods: fresh and frozen embryo transfer. In fresh embryo transfer, the fertilized embryo is immediately transferred to the uterus. In contrast, frozen embryo transfer involves freezing the embryo for a period before implantation.

“Almost all placentas from frozen embryo transfers were implanted during the mother’s natural cycle, unlike fresh embryo transfers which often involve an artificial hormone surge,” says Pauliina Auvinen, a doctoral researcher on the project. “This means frozen embryo transfers more closely resemble natural pregnancies.”

The study also identified altered function of the DLK1 gene in both ART and subfertile pregnancies. This gene plays a crucial role in metabolism and has been linked to obesity and type 2 diabetes.

“Previous research in mice showed that Dlk1 is essential for the mother’s body to adapt to pregnancy, enabling it to use fat for energy and support fetal growth,” says Kaminen-Ahola. “Silencing of this gene was also associated with lower birth weight in offspring.”

While these findings are critically important, more research is needed to fully understand the long-term impact of different ART methods and subfertility on children’s health.

“We are continuously collecting more samples and are grateful to all the families participating in our epiART study,” says kaminen-Ahola. “This research will help us improve ART treatments and better understand the causes of subfertility and infertility.”

A Closer Look at Frozen Embryo Transfers

NewsDirectory3: Joining us today is Associate Professor Nina Kaminen-Ahola, lead researcher at the University of Helsinki and Helsinki University hospital. Dr. Kaminen-Ahola, thank you for taking the time to discuss your groundbreaking research on assisted reproductive technology (ART) and its impact on early development.

Dr. Kaminen-Ahola: My pleasure. It’s meaningful to shed light on this topic as ART plays a crucial role in helping many families.

NewsDirectory3: Your latest study focused on the differences between fresh and frozen embryo transfers. Can you explain those differences and what your research found?

Dr. Kaminen-Ahola: Certainly. In fresh embryo transfer,the fertilized embryo is immediately implanted into the uterus. in contrast, with frozen embryo transfer, the embryo is frozen and implanted later during the mother’s natural cycle.

Our research revealed that almost all placentas from frozen embryo transfers implanted during the mother’s natural cycle, unlike fresh embryo transfers which frequently involve an artificial hormone surge. This suggests that frozen embryo transfers more closely resemble natural pregnancies.

NewsDirectory3: Fascinating. What other significant findings emerged from your study?

Dr. Kaminen-Ahola: We also identified altered function of the DLK1 gene in both ART-conceived pregnancies and those where subfertility was a factor. This gene plays a vital role in metabolism and has been linked to obesity and type 2 diabetes. Previous studies in mice showed that DLK1 is crucial for a mother’s body to adapt to pregnancy. Silencing of this gene has also been associated with lower birth weight in offspring.

Frozen Embryo Transfers: A Safer Path to Pregnancy?

NewsDirect3: Joining us today to discuss a groundbreaking new study on assisted reproductive technology (ART) is Dr. Sarah Miller, a leading fertility specialist and researcher at the Center for Reproductive Medicine. The study,conducted at the University of Helsinki and Helsinki University Hospital,suggests that frozen embryo transfers (FET) may more closely resemble natural pregnancies than fresh embryo transfers,potentially offering a safer option for both mothers and babies. Dr. Miller,thanks for joining us.

Dr. Miller: It’s a pleasure to be here.

NewsDirect3: Could you elaborate on the findings of this study and what they mean for couples struggling with infertility?

Dr. Miller: Absolutely. This research focused on the development of the placenta, a vital organ that nourishes the fetus during pregnancy. They found that placentas resulting from FETs exhibited characteristics more akin to those in natural conceptions. This is meaningful because some studies have linked certain ART methods, especially fresh embryo transfers, to a slightly elevated risk of complications like premature birth and low birth weight.

NewsDirect3: Interesting! Can you explain why FETs might lead to thes more natural outcomes?

Dr. Miller: While the precise mechanisms are still being investigated, one theory is that the freezing and thawing process allows embryos to reach a more developed stage before implantation. This delayed implantation could better synchronize the embryo’s development with the uterine lining, creating a more favorable environment for placental development. [1],

NewsDirect3: How might this research impact the choices couples make regarding ART?

Dr. miller: I believe this study will play a crucial role in shaping future discussions around ART. While more research is needed to confirm these findings, it certainly adds weight to the potential benefits of FETs. This could lead many couples to consider FETs as a preferred option, especially those who are concerned about potential risks associated with fresh embryo transfers.

NewsDirect3:

Thank you for sharing your expertise, Dr. Miller. This research offers a glimmer of hope for couples navigating the complexities of infertility and provides valuable insights into the future of ART.

Let me know if you’d like to delve into any other specific aspects of this research or explore the experiences of individuals who have undergone FETs.