The hidden cost of genetic resistance to HIV-1

Heritable Genome Editing and the Downsides of a Global Moratorium

In 2018, Dr. He Jiankui reported that he had edited human embryos and transferred them to a woman, causing her to give birth to twin girls with modified genomes. An international group of scientists and ethicists responded by proposing a global moratorium on heritable genome editing (HGE). In this article, I oppose this proposal on several grounds. A global moratorium might encourage participating nations to ban HGE or postpone access to it indefinitely. It might also deter or delay basic research that could lead to safe and effective HGE. Lastly, a global moratorium might induce participating nations to adopt or maintain laws and regulations that stigmatize children born with modified genomes. As an alternative, I argue that nations should regulate HGE for safety and efficacy only and without distinguishing between therapeutic and enhancing modifications.

[Enhancement can do harm]

Inactivation of the CCR5 gene by CRISPR editing in human embryos, as recently attempted in China, was touted as a positive change for the babies involved since it was expected to impart resistance to HIV infection. However, it turns out that the absence of CCR5 is not neutral but actually decreases fitness, as shown by survival analysis of population data in the UK biobank. This underlines the pitfalls of genetic enhancement, and emphasizes that any germline modification must be preceded by in-depth studies to exclude unforeseen negative effects. ‡.