Breakthrough in Science: Fertile Mice Created from Two Male Parents Using DNA Editing-A Game-Changer for Future Generations!
Researchers at Shanghai Jiao Tong University in China have made a significant breakthrough in genetic science by successfully producing mice using only the DNA from two sperm cells-an achievement that has been the subject of intense research for decades. Published in the “Proceedings of the National Academy of Sciences” on June 23, 2025, this study not only marks progress in the field of genomics but also shows that the resulting mice are both healthy and fertile, capable of producing offspring of their own.
While the creation of offspring from same-sex parental DNA has been explored previously, the latest research emphasizes a crucial advancement: the motherless mice’s fertility and overall health. This was made possible through targeted editing of DNA methylation via epigenetic programming, a process that alters gene expression without changing the underlying DNA sequence. “It confirms that genomic imprinting is the main barrier to uniparental reproduction in mammals and shows it can be overcome,” said Dr. Helen O’Neill, an associate professor and molecular geneticist at University College London.
Despite the promising results, scientists express caution regarding the application of these methods in humans. Christophe Galichet from the Sainsbury Wellcome Centre in the UK highlighted the significant barriers to human reproduction that would arise from such research, noting the extensive requirements for eggs, the need for surrogate mothers, and the prevailing low success rates.
Mammalian embryos undergo a process called imprinting, where chemical modifications in DNA dictate gene activity based on parental origin. Historically, efforts to create embryos using only DNA from eggs or sperm were considered doomed due to the lethal consequences of improper imprinting. However, past breakthroughs, including the birth of Kaguya-a mouse born from two unfertilized eggs-have paved the way for recent advancements.
This new experiment involved using two different strains of mice: one from a European lab and another from wild mice in Thailand. Researchers utilized CRISPR and CAS technology to edit the methylation patterns in an unfertilized egg, which had its genome removed. They then injected two sperm heads into this egg, allowing for the combination of XX and XY chromosomes.
Out of 250 modified embryos, 16 resulted in pregnancies. Although four of the pups died at birth, three males were born alive. Unfortunately, one of them perished the day after birth, reportedly growing 40% larger than typical newborn mice-a sign of potential health complications.
While the study represents a critical step forward, researchers acknowledge the challenges of accurately reprogramming all seven imprinting sites in the genome, highlighting the risk of off-target effects that could lead to unintended genetic modifications. Prior research also underscored similar challenges; previous attempts produced mice from two fathers, though these subjects were not fully healthy or fertile until significant genetic modifications were made.
This groundbreaking research opens the door to new reproductive technologies and genetic understanding, but the implications for human application remain far off. As scientists continue to dissect the complexities of epigenetics and reproduction, the future may hold transformative possibilities in the field of genetics.
Original Source: https://indianexpress.com/article/technology/science/scientists-modify-dna-to-produce-fertile-mice-from-two-male-parents-for-first-time-10085025/
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Publish Date: 2025-06-24 13:44:00
