Development of sheep-human embryos raises question of what it means to be uniquely human.

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Embryonic Human DNA Has Just Been Successfully Repaired in the U.S.

U.S. scientists have successfully repaired DNA in a human embryo for the first time.

Image source: Kateryna Kon/Shutterstock

American researchers have announced the successful repair of a human embryo's genes. As reported in the journal Nature, they used CRISPR-cas9. On one hand, their success represents an exciting breakthrough and on the other, it's a stark reminder of all we don't yet understand about human genetics. That's because the repair of the gene occurred in a way that researchers didn't anticipate.

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New Research Shows a Way Gay Couples Could Have Children Using Their Own DNA

Scientists conceptualize a potential avenue of creating an embryo with only male cells.

Two men with each holding a baby.

Remember that Arnold Schwarzenegger movie Junior where he was pregnant? Though it seemed hilarious and over-the-top at the time, scientists are actually close to making such a thing possible, sort of. Researchers at the University of Bath in the UK have opened up the possibility of an embryo using only male cells. Working with mice, they made a pseudo-embryo called a “parthenogenote.” This was an embryo created without sperm. The feat is performed by fooling an egg cell into thinking it’s been fertilized. Usually, a parthenogenote dies off after a few days. But here, scientists were able to fertilize them with a sperm cell, and inject each embryo into a female mouse.

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