Safer way to do gene editing

DNA Strands

3d render of a DNA spirals

Source: BBC

Scientists say they have fine tuned a gene editing method to make it safer and more accurate – vital if it is to be used in humans to cure inherited diseases or inborn errors.

The advance, outlined in Science Magazine, comes as world leaders in the field gather to debate the ethics of altering human DNA using the method, known as Crispr-Cas9.

Gene editing holds medical promise.

But changing a person’s DNA also has potential risks and ethical quandaries.

The first International Summit on Human Gene Editing will debate how far the science should progress.


Crispr-Cas9 is a DNA cutting and pasting system that scientists have borrowed from nature. Bacteria use it to protect themselves against foreign DNA from viruses.

Bacterial DNAImage copyrightScience Photo Library

Scientists have been using it in the lab to target and cut out faulty DNA in human cells that cause illnesses.

While effective, the process is less than perfect and can cut out too much DNA, experts have found.

Gene editing

How gene editing works

These unwanted or ‘off-target’ edits could alter other important genes, inadvertently triggering cancer, for example.

Researchers at the Broad Institute of MIT and Harvard believe they have solved this problem by changing the molecular structure of the Cas9 enzyme.

Their modified version should now only snip out the DNA it is designed to, leaving the rest of the precious genetic code intact, the US team say.

They made changes to amino acids – the building blocks of Cas9 – and found this improved its accuracy, reducing the risk of ‘off-target’ cuts.

In repeated tests on human embryonic kidney cells, the researchers were unable to detect any cutting errors.

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