Meet Positives Posts An Article on Herpes Cure Update

Meet Positives has been in the front line of providing information about lifelong infections. Recently, the site has posted a herpes cure update with information about herpes and developing cures.

According to the post, "The CRISPR/Cas9 system targets specific DNA sequences and induces clean cuts across both strands of the DNA. In mammalian cells, such cuts are flagged and quickly repaired by an emergency repair system called NHEJ (for non-homologous end-joining). NHEJ is efficient but not very accurate and often results in insertion or deletion of a few DNA bases at the repair site. Because DNA is read in codons of three bases at a time, such small changes in critical positions often destroy the function of the respective gene and its protein product.

"Robert Jan Lebbink, from the University Medical Center in Utrecht, The Netherlands, and colleagues reasoned that CRISPR/Cas9 could target and mutate latent herpesvirus DNA in infected human cells and so potentially prevent herpesvirus-associated diseases. To test this, the researchers devised specific guide (g)RNAs–sequences that are complementary to vital parts of the viral genome and function as ‘molecular addresses’. These gRNAs, combined with the ‘molecular scissors’ part of the CRISPR/Cas9 system, should induce specific cuts and subsequent mutations in the herpesvirus DNA, and so cripple the viruses.

"In their systematic approach, the researchers looked at three different members of the herpesvirus group: herpes simplex virus type 1 (HSV-1) causing cold sores and herpes keratitis; human cytomegalovirus (HCMV), the most common viral cause of birth defects (when the virus is transmitted from mother to fetus); and Epstein-Barr virus (EBV) causing infectious mononucleosis and multiple types of cancer.

"Working with lymphoma cells latently infected with EBV, the researchers showed that introduction of gRNAs that target specific EBV DNA sequences can introduce mutations at the targeted sites. Such mutations can eliminate essential functions of the virus as well as destabilize the viral DNA molecules. Consistent with this, the researchers report that by using two different gRNAs targeting an essential EBV gene, they can induce loss of over 95% of EBV genomes from the host cells."

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