Arnaud Pontin (Photo : Sfchronicle.com)
CCR5: The Genetic Mutation Opening the Door to an HIV Cure
Among all the strategies studied against HIV, the one that has produced the most spectacular results involves a genetic mutation known as CCR5. Rare cases have shown that a complete cure is biologically possible, offering unprecedented hope in the fight against the virus.
The Rare Confirmed Cases of Cure
A few people around the world have been considered cured of HIV after receiving stem cell transplants from donors carrying the CCR5-Δ32 mutation, which prevents the virus from entering immune cells.
The most famous case is Timothy Ray Brown, known as the “Berlin Patient.” After a bone marrow transplant to treat leukemia, he received cells from a donor carrying this mutation. The result: the virus was never detected again in his body.
The Cure of Timothy Ray Brown
An American living in Germany, Timothy Ray Brown is recognized as the first person in the world cured of HIV. His extraordinary medical journey transformed his life and opened new perspectives in the search for a cure for the virus.
A Double Diagnosis
Diagnosed HIV-positive in the 1990s, Timothy was taking antiretroviral treatment to control his infection. In 2006, he received a second diagnosis: acute myeloid leukemia, an aggressive blood cancer requiring a bone marrow transplant.
An Experimental Approach
To treat his leukemia, doctors opted for a bone marrow transplant. The donor carried the CCR5-Δ32 mutation, known for blocking HIV from entering CD4 lymphocytes.
The 2007 procedure combined several complex steps: destruction of the diseased bone marrow through chemotherapy and radiotherapy, transplantation of the donor’s stem cells, and close monitoring to prevent rejection or complications.
Historic Results
After the transplant, the virus became undetectable in Timothy’s blood. His new immune cells gradually replaced those infected by HIV. Even after stopping antiretroviral therapy, no trace of active or latent virus was detected. In 2008, doctors confirmed his complete remission, making him a historic symbol in the fight against HIV.
Other similar cases, such as that of Adam Castillejo, have been reported, confirming that a prolonged absence of virus without treatment is possible.
Why This Solution Is Not Applicable on a Large Scale
Although these cases prove that an HIV cure is possible, the procedure remains unrealistic for most people. Bone marrow transplantation is complex, risky, and reserved for severe diseases. It involves serious complications and a risk of mortality, making it unsuitable for treating a viral infection that can already be controlled with medication.
The Most Promising Path Today
Researchers are now trying to reproduce this protective effect without transplantation, by directly modifying immune cells using gene editing technologies such as CRISPR. The goal is to:
modify the CCR5 gene in immune cells,
make them resistant to HIV,
reinject these modified cells into the body.
If these resistant cells multiply sufficiently, they could gradually replace the cells vulnerable to the virus.
Where Research Stands Today
Clinical trials are already testing these approaches. Preliminary results show that the technique is feasible and relatively safe, but it has not yet produced a complete cure in the majority of participants.
Several avenues are being explored simultaneously: CCR5 gene editing, elimination of viral reservoirs, therapeutic vaccines, and cellular mechanisms such as CARD8.
The question is no longer “is it possible to cure HIV?” but rather “how can this cure be made safe, simple, and accessible to millions of people?”
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