08/09/2026
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A remarkable milestone in genetic research has just been achieved.
For the first time in history, scientists have successfully used CRISPR gene editing to delete the extra chromosome responsible for Down syndrome (trisomy 21).
Using cells derived from individuals with Down syndrome, researchers were able to remove the additional copy of chromosome 21 in both stem cells and skin cells restoring normal gene expression. This breakthrough marks a major step forward in our understanding of how chromosomal abnormalities might one day be corrected at the source.
The process involved carefully timed CRISPR-Cas9 edits and temporary suppression of DNA repair mechanisms to achieve unprecedented precision. While still confined to laboratory studies, this advance offers new hope for addressing genetic conditions once thought untreatable.
If refined and proven safe, the same strategy could eventually extend to the treatment of other severe trisomies, such as 13 and 18, and perhaps one day be applied prenatally.
This work, published in PNAS Nexus (2025) under the title “Trisomic rescue via allele-specific multiple chromosome cleavage using CRISPR-Cas9 in trisomy 21 cells,” represents a bold new frontier in genomic medicine. 🇮🇪🇦🇪🇬🇧🇪🇬🇪🇺
