Potential to remove HIV from infected cells

‘Molecular scissors’ successfully remove HIV genes from all tissues in infected monkeys

The top story from the Conference on Retroviruses and Opportunistic Infections (CROI 2019) in Seattle this week has been a likely second HIV cure. However, the cure involved an expensive and risky therapy – a bone-marrow transplant – that would never be broadly applicable.

Just as significant in the long term may be a study reported in the same session that used much more benign technology to achieve what may be a cure in monkeys.

A team of researchers at Temple University in Philadelphia, USA, has removed the retroviral genes from the cells of monkeys infected with SIV, the monkey analogue of HIV. The researchers found that the gene-snipping enzyme they used, contained within the shell of a common cold-type virus so that it could simulate an infection and enter cells, successfully removed the SIV genes from a majority – and possibly all – cells in all the monkeys’ organs where levels were measured, including hard-to-access ones such as the brain.

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CRISPR-based gene therapy, speculating about a time-table

We’re still a long way from using gene-editing for medical conditions?

Gene editing has been in the news lately due to an ethically reckless experiment in which human embryos were subjected to an inefficient form of gene editing. The subjects, now born, gained uncertain protection from HIV in exchange for a big collection of potential risks. A large number of ethicists and scientists agreed that this isn't the sort of thing we should be using gene editing for.

Gene editing will likely always come with a bit of risk; when you're cutting and pasting DNA in millions of cells, extremely rare events can't be avoided. So the ethical questions come down to how we can minimize those risks and what conditions make them worth taking.

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Potential paths to an HIV cure

Second-Ever HIV Cure Seen In London AIDS Patient Is Rare, But It Might Not Have To Be

For just the second time, a patient with AIDS appears to have been cured of the disease after receiving a stem cell transplant from a donor with a genetic mutation that provides resistance to HIV, which causes AIDS. But the mutation is exceedingly rare, raising controversial questions of whether it may be replicated using nascent gene-editing tools like CRISPR/Cas9.

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