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Researchers in China have reported editing the genes of human embryos to try to make them resistant to HIV infection. Their paper — which used CRISPR-editing tools in non-viable embryos that were destroyed after three days — is only the second published claim of gene editing in human embryos.
The mutation that was introduced is the naturally occurring variant in the CCR5 gene seen in some people resistant to AIDS progression.
http://link.springer.com/article/10.1007%2Fs10815-016-0710-8 [springer.com]
http://www.nature.com/news/second-chinese-team-reports-gene-editing-in-human-embryos-1.19718 [nature.com]