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Scientists Create Female Clones from Male Mouse Embryos Using CRISPR

Jessica Hamzelou· August 12, 2026 View original

Key takeaways

  • Scientists have successfully created female clones from male mouse embryos.
  • The technique involved removing the Y chromosome using CRISPR.
  • This research is a first in deliberately altering sex determination in mammals.
  • It opens new avenues for understanding genetics and reproductive biology.

Who benefits

BiotechnologyPharmaceuticalsAgricultureHealthcare

Summary

Scientists in Japan have successfully transformed male mouse embryos into females by removing the Y chromosome with a CRISPR-based approach, creating female clones from male genetic material. This marks the first time such a feat has been achieved.

A team of scientists in Japan has achieved a significant breakthrough in reproductive biology. They successfully used a CRISPR-based gene-editing technique to modify male mouse embryos, specifically by removing the Y chromosome. This intervention resulted in the development of female clones from what were originally male genetic sources. This pioneering work represents the first instance of deliberately converting male mammalian embryos into females.

Why it matters

While directly applicable to human reproduction is distant, this research pushes the boundaries of genetic manipulation and understanding of sex determination, potentially informing future medical and agricultural advancements.

How to implement this in your domain

  1. 1Monitor advancements in genetic editing technologies for ethical and practical implications.
  2. 2Evaluate potential long-term societal impacts of advanced reproductive technologies.
  3. 3Invest in interdisciplinary research exploring the ethical frameworks for genetic manipulation.

Original post by Jessica Hamzelou

"Scientists have deliberately turned male mouse embryos into females for the first time. A team based in Japan used a CRISPR-based approach to remove the Y chromosome from male cells and create female clones of male mice. “No one has done this before,” says Monika Ward, a reproduc…"

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Originally posted by Jessica Hamzelou on X · view source

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