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May 18, 2022

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Move on to a cure for herpes

A new approach based on genetic "scissors" cutting the virus DNA treats cold sores in a test tube. Animal testing is the next step.

Gianluca Ricciodi Gianluca Riccio
in Medicine
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August 27 2020
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Researchers at the Fred Hutchinson Cancer Research Center in Seattle, USA, used gene editing to remove latent herpes simplex virus 1 (HSV-1), also known as oral herpes.

In mice, according to the scientists, the technique showed a 92% decrease in the latent virus, enough to prevent the infection from returning. In fact a cure for herpes. Even if it served to prevent the causes of the infection, it would be a fantastic discovery.

Move on to a cure for herpes

Shred the virus

The study used two sets of "genetic scissors" to damage the DNA of the virus, develop a delivery vehicle to infected cells and target the nerve pathways that connect the neck to the face, reaching the tissue where the virus lies dormant.

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The results of this herpes cure method are published in Nature Communications.

"This is the first time that scientists have been able to enter and actually eliminate most of the herpes in a human body," says the study's author. Dr. Keith Jerome.

We are targeting the root cause of the infection: the infected cells in which the virus lies dormant and are the "seeds" that give rise to repeated infections

Keith Jerome

Most of the research aimed at finding a cure for herpes has focused on suppressing the recurrence of painful symptoms. Jerome said his team is taking a completely different approach by focusing on how to cure the disease.

Next steps towards a cure for herpes

"The big leap now is going from test tube to animal," said Jerome. "I hope this study changes the dialogue on herpes research and opens up the idea that we can start thinking about the cure for herpes rather than just controlling the virus."

According to the World Health Organization (WHO), two thirds of the world's population under the age of 50 has HSV-1. The infection mainly causes cold sores and is permanent.

How the anti herpes method works

Move on to a cure for herpes
Herpes Ultimate Cure - Computer generated image of a meganuclease (center), compared to the antibody (left) and CRISPR-Cas9 (right).

For this study, the researchers used two types of "genetic scissors" to cut the herpes virus DNA. They found that when only one pair of "scissors" is used, the virus DNA can be repaired in the infected cell.

However, by combining two "scissors" (two sets of gene-cutting proteins called meganucleases that concentrate and cut a segment of herpes DNA) the virus breaks apart.

"We use a double meganuclease that targets two sites on the virus's DNA," explained the first author. Martine Aubert, senior scientist. "When there are two cuts, the cells seem to say that the virus's DNA is too damaged to repair, and other molecular actors come in to remove it from the cell body."

Researchers found a 92% reduction in viral DNA present in the upper cervical ganglia, the nerve tissue in which the virus lies dormant.

The reductions remained for at least a month after treatment, enough to prevent the virus from reactivating.

After fine-tuning their approach to a cure for herpes, the team found that the method of using meganuclease cuts is more efficient than even CRISPR, the most current gene editing technique.

They are now pursuing a similar strategy for HSV-2, which causes genital herpes, and plan to begin clinical trials by 2023.

tags: cycleGenetic editingHerpes
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