Nature is investigating concerns surrounding a paper at the heart of a news story published last week on the death of a 6-year-old girl following a gene therapy treatment in China. As we reported in collaboration with Science, the work was funded in part by the family of a 6-year-old girl with the condition. The parents ended up paying $860,000 to fund preclinical work for a gene-editing treatment for their daughter, who died of a severe immune reaction to the therapy seven days after receiving it. “The manuscript that was submitted to us … described preclinical feasibility work only — a mouse model and non-human primate experiments,” she told Retraction Watch by email. Qiu’s university has also launched an investigation, Science reported earlier this week.