Since scientists first figured out how to edit genes with precision using a technology called CRISPR, they’ve been grappling with when and how to do it ethically. Is it reasonable to edit human genes with CRISPR? What about human genes in reproductive cells that pass the edits on to future generations?
An earlier U.S. National Academies committee had already released recommendations in 2017. They called for caution – but were ambiguous enough for Chinese scientist He Jiankui to suggest he’d followed them even as he produced twin girls with CRISPR-edited genomes late last year.
Here are five stories from our archive that explore how to ethically develop and regulate a potentially risky new technology.
1. A voluntary pause
No one denies the power of the CRISPR editing tool. It could allow doctors to one day cure genetic diseases, whether in adults who are living with medical conditions or in embryos that have not yet even been born. But there’s a lot of lab work yet to be done, as well as many conversations to be had, about the right way to proceed.
In 2015, a group of prominent scientists called for a voluntary freeze on germline editing – that is, changing sperm, eggs or embryos – until ethical issues could be resolved.
The National Academies’ 2017 report was meant to provide the scientific community with definitive guidance on the issue.
Rosa Castro, a scholar of science and society, explained that the report gave the green light to modifying body cells and a yellow light to modifying reproductive cells that would allow the changes to be inherited by future progeny. The report’s goal was to ensure that “germline genome editing will be used only to prevent a serious disease, where no reasonable alternatives exist, and under strong supervision.”
3. Science marches on
By later that year, a research group announced they’d successfully used CRISPR to modify human embryos, though the edited embryos weren’t implanted in women and were never born. Bioethics and public health professor Jessica Berg wrote about the importance of working out the ethical issues of gene editing before researchers take the critical step of allowing modified embryos to develop and be born as babies.
“Should there be limits on the types of things you can edit in an embryo? If so, what should they entail? These questions also involve deciding who gets to set the limits and control access to the technology.
“We may also be concerned about who gets to control the subsequent research using this technology. Should there be state or federal oversight? Keep in mind that we cannot control what happens in other countries.
“Moreover, there are important questions about cost and access.”
4. Babies born with edited genomes
Most of the world reacted with shock in 2018 when a Chinese researcher announced he’d edited the germline cells of embryos that went on to become twin baby girls. His stated goal was to protect them from HIV infection.
This development seemed to many researchers to be in violation of at least the spirit of the 2017 guidelines around human gene editing. Biomedical ethicist G. Owen Schaefer described the central objection: that the procedure was simply too risky, with the potential for unexpected and harmful health effects later in the girls’ lives outweighing any benefit.
Whatever the outcome of the current meeting, there may be a distinction between sticking to the rules and doing what’s right. Arizona State professor of life sciences J. Benjamin Hurlbut and applied ethicist Jason Scott Robert underscored this point after Chinese scientist He Jiankui claimed he checked off the boxes laid out by the 2017 guidelines.
Guidelines and expectations can help define what the scientific community finds acceptable. But complying with the routines of oversight doesn’t guarantee a project is ethical. That’s a much more complicated question.
Maggie Villiger is a Senior Science + Technology Editor at The Conversation. Maggie has a background in broadcast journalism, having worked in both public radio and television. She has a BA in neuroscience and an MA in science communication.