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Japanese scientists have achieved a major medical breakthrough by using CRISPR gene editing technology to remove the extra chromosome that causes Down Syndrome, successfully restoring normal cell function in laboratory tests.
Dr. Ryotaro Hashizume's team at Mie University developed a precise method that eliminates only the third copy of chromosome 21, leaving the normal pair intact — solving one of genetics' most difficult puzzles.
The results are remarkable for their precision. Using a specific CRISPR approach that targets alleles, the researchers achieved a 13.1% success rate in removing the extra chromosome from human cells, which increased to 30.6% when combined with a temporary halt to DNA repair. Unlike previous attempts that risked damaging healthy chromosomes, this approach works like “molecular scissors” that cut only the problematic genetic material.
What makes this discovery particularly important is that it worked on both stem cells and mature skin cells taken from people with Down syndrome. The treated cells showed restoration of gene expression patterns and improved survival rates, suggesting that the technique successfully alleviated the genetic burden that causes developmental changes in the condition.
Down syndrome affects approximately 1 in 700 newborns and is caused by trisomy 21 — the presence of three copies of chromosome 21 instead of two. This excess genetic material hinders normal development and increases the risk of heart problems, learning disabilities, and other health concerns. Current treatments only manage the symptoms and not the underlying genetic cause.
This study represents a “proof of concept” and not an immediate cure. Scientists emphasize that the technique requires a lot of testing for safety and refinement before it can be applied in clinical practice. However, the study published in the journal PNAS Nexus shows that correcting chromosomal abnormalities at the cellular level is scientifically possible.
This advance could lead in the future to treatments that address the genetic root cause of Down Syndrome, rather than simply managing its consequences — potentially changing the way we approach chromosomal disorders.
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