The infamous CRISPR Chinese twins case. For several years the Chinese were experimenting with animal embryos. Even other countries are developing genetically modified livestock animals. However, it's banned to alter the human genes. He Jiankui managed to delete the CCR5 gene to provide immunity against HIV for these babies. (their father has HIV)
US scientists claim that the deletion of CCR5 in experiments with mice, they found that it makes the mice smarter. The CCR5 gene plays a role in memory and the brain’s ability to form new connections.
Also it improves human brain recovery after stroke, and could be linked to greater success in school.
The Chinese authorities handed a 3 year jail sentence to He Jiankui and also gave lesser jail terms for two of his assistants with fines of around $ 425,000. in total. The existing Chinese regulations, though not very detailed, does not provide a legal basis for his experiment.