A gene-editing first: scientists tried CRISPR to fight HIV

Scientists are reporting the first use of a gene-editing tool called CRISPR to try to cure a man’s HIV infection. They gave him blood cells that were genetically modified to resist the AIDS virus.
The gene-editing tool has long been used in research labs, and a Chinese scientist was scorned last year when he revealed he used it on embryos that led to the birth of twin girls. Editing embryos is considered too risky, partly because DNA changes can pass to future generations.
The new work is