From the Washington Post...
The work, led by Junjiu Huang of Sun Yat-sen University in Guangzhou, focused on modifying the gene responsible for β-thalassaemia, a blood disorder that can be fatal. They used CRISPR, a cutting-edge gene editing tool that's already made serious waves in the genome editing of other species. By going after genes at the earliest stage of human development -- in a single-celled embryo -- theoretically one can make sure all the subsequent copies of the gene are the superior version.
It doesn't take a science fiction fan to extrapolate the future possibilities, does it?