China clones monkeys and deliberately edits genes to make them mentally ill

Chinese geneticists have been criticised after cloning five monkeys that were deliberately “edited” to be mentally ill.

Welfare concerns have been expressed after the genetically identical macaques showed signs of depression, reduced sleep and “schizophrenia-like behaviours”.

The animals were born with an inoperative BMAL1 gene, which helps regulate the circadian rhythm and was altered using the CRISPR “molecular scissors” editing technique.