Not many scientific tools have inspired as much surprise and controversy as CRISPR-Cas9, the genetic “scissors” that allow precise DNA editing.
In 2017, researchers at Oregon Health & Science University used the CRISPR-Cas9 technique to correct a heart disease mutation in human embryos. Though the embryos were not implanted, the study demonstrated that it was possible to safely and effectively remove an inherited mutation at the earliest stage of life.
The motivation behind the work was medical: while many genetic disorders are passed down through generations with no cure, CRISPR offers the promise of halting that transmission altogether.
However, the experiment raised immediate ethical alarms. Editing embryos touches on profound questions about consent, the limits of human intervention, and the spectre of “designer babies.”
The team, led by Shoukhrat Mitalipov, emphasised the therapeutic intent, but the international scientific community remains cautious. Regulations in most countries forbid using edited embryos to create pregnancies.
Still, the breakthrough has spurred global debate and research. For now, CRISPR’s promise lies mostly in treating diseases in living patients.
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