Study Reveals IVF Linked to Increased DNA Mutations in Mice

Research published in the journal Genome Research indicates that mice conceived through in vitro fertilization (IVF) exhibit a slight increase in DNA mutations compared to those conceived naturally. This study, led by geneticist Beth Dumont from The Jackson Laboratory, emphasizes the need for further investigation into the effects of fertility treatments on offspring’s genetic health.

The research team analyzed the genome sequences of mice conceived via IVF and other assisted reproductive technologies, such as hormone treatments and embryo transfers. They found that pups born through these methods had approximately 30% more new single-nucleotide variants—small changes in DNA sequences—compared to their naturally conceived counterparts.

Single-nucleotide variants represent genetic changes that can occur during DNA replication. While the study identified an increase in mutation rates, Dumont noted that most of these mutations are neutral and unlikely to cause health issues. “Even though we see an increase in mutation rate, most of these mutations are peppered across the genome, and they are neutral mutations that have no impact overall on the organism’s phenotype,” Dumont stated.

Understanding the Findings

The absolute number of harmful mutations remains low, despite the observed increase. For every 50 mice conceived through IVF, researchers expect only about one additional harmful DNA change. This finding places the risk of significant genetic issues into perspective, as the mouse genome contains roughly 2.7 billion DNA letters.

The timing of these mutations in early embryonic development appears similar between both groups, suggesting that while IVF may elevate the overall mutation rate, it does not alter the timing of when these mutations occur. The biological mechanisms behind these mutations remain unclear, warranting further research to identify whether they stem from specific IVF steps or a combination of factors.

Dumont posits that hormone treatments used to stimulate ovarian function could contribute to these genetic changes, as they prompt eggs to restart meiosis—a stage of cell division known to be error-prone. Other potential influences include the physical handling of embryos and the laboratory conditions in which they are cultured.

Implications for Human Fertility Treatments

While this study provides insights into the genetic consequences of assisted reproductive technologies in mice, it does not directly translate to humans. Differences in reproductive biology, such as the absence of menstruation in mice, complicate comparisons. Furthermore, individuals undergoing IVF may already face environmental factors that could affect their genetic makeup.

Dumont emphasizes the necessity of conducting further studies on human subjects to explore any potential genetic implications of IVF. “Nothing in our study directly speaks to the potential of mutations in human IVF, but there have been associations in the literature suggesting some steps in IVF might induce genetic changes,” she remarked.

The research team also included co-authors Laura Blanco-Berdugo and Alexis Garretson from The Jackson Laboratory. The study’s findings underscore the importance of transparency and informed decision-making in fertility treatments, ensuring patients understand the potential risks associated with assisted reproductive technologies.

More information can be found in the publication: Laura Blanco-Berdugo et al., “Modest increase in the de novo single nucleotide mutation rate in house mice born by assisted reproduction,” Genome Research (2025). DOI: 10.1101/gr.281180.125.