CRISPR Gene Editing: Can we rewrite our DNA?

Ayesha Zakir

September 25th 2026

CRISPR Gene Editing: Can we rewrite our DNA?

A revolutionary technology is giving scientists the opportunity to make precise changes to DNA. But how does CRISPR work and how far should we take it?

What exactly is CRISPR?

We are all familiar with editing photos, documents and computer code, but in recent years, scientists have now learned to edit something far more fundamental to life itself: DNA.

Imagine that instead of treating the symptoms of a genetic disease, doctors could alter the genetic mutation responsible for it. That is precisely the purpose of CRISPR, a revolutionary gene editing technology that allows scientists to target specific sections of DNA and make changes to them. Identified as a part of the natural bacterial defense system, CRISPR was transformed into a gene editing tool in 2012 by scientists Emmanuelle Charpentier and Jennifer Doudna. Their groundbreaking work earned them the 2020 Nobel Prize in Chemistry, marking a major milestone in our ability to understand and potentially treat genetic diseases.

The science behind CRISPR

The science behind CRISPR is based on a natural immune system that bacteria use to defend themselves against viruses. Scientists have adapted this system into a powerful gene editing tool called CRISPR-Cas9. There, a protein called Cas9 acts like molecular scissors, cutting DNA at chosen locations where later the cell then naturally repairs the cut. By taking advantage of this repair process, scientists can remove, repair or alter sections of DNA, giving researchers the ability to make changes in the genetic instructions that control how cells function. 

From the lab to the clinic

In the United States, the FDA approved Casgevy in 2023, a gene-editing treatment that uses CRISPR/Cas9 to treat certain patients aged 12 or older with sickle cell disease, a disease caused  by a genetic mutation in the HBB gene, which is involved in producing hemoglobin: a protein found in red blood cells with a primary function of carrying oxygen. This marked a major breakthrough in the field of gene therapy, proving that CRISPR could advance from scientific research into actual medical treatment.

Potential Risks of Gene Editing

Despite the potential that CRISPR based-treatments present, they also carry important risks and limitations. One major concern is the possibility of off-target-effects, in which the CRISPR system makes unintended changes to DNA at locations other than the specific gene being targeted, although researchers use techniques designed to reduce and detect these unwanted edits, it can be difficult to predict every possible consequence of altering a person's genome. Even changes at the intended target can sometimes produce unexpected results because the cell's natural DNA-repair mechanisms may repair the edited DNA in unintended ways. This means that gene editing cannot always be considered completely precise. 

How far should we go?

CRISPR has now shown that changing our DNA is no longer just something from science fiction. It has already moved from the laboratory to medicine, offering new possibilities to people with genetic diseases. Scientists must consider not only what CRISPR can achieve, but also its risks and consequences. There are questions about who has access to these treatments and whether gene editing should be used for purposes beyond treating serious diseases. Editing cells in a patient is very different from making inherited changes that could affect future generations. CRISPR has given us the ability to change the code of life; what remains uncertain is how far we should take it.