As these arguments rage on, technological breakthroughs in embryo culture that make it easier to keep embryos alive in the lab for longer are putting greater pressure on the 14-day rule. For decades, the rule was relatively academic. In reality, sustaining an embryo outside of the human body beyond seven days was long considered a near-impossible feat. But this has begun to change. In 2016, scientists in both New York and Cambridge grew human embryos for 13 days, pushing against the limit of the regulations. Then in November 2019, a group of scientists at the Yunnan Key Laboratory of Primate Biomedical Research in the Chinese city of Kunming published a study that sent reverberations throughout the world of reproductive medicine – they’d successfully cultivated monkey embryos for 20 days. [...]
So, the benefits to human health of extending the 14-day rule could be sizeable, but those who oppose the change fear that it will be a slippery slope towards an ever-increasing time window for human embryo research, and also lead to the approval of other reproductive technologies that remain highly contentious. For instance, concerns were raised at a discussion held by the Nuffield Council on Bioethics in 2017 that extending the 14-day rule could help pave the way for the legalisation of human germline engineering, which would allow clinics to create genetically modified babies via the editing of embryo genomes. Giulia Cavaliere, a bioethicist at Lancaster University, is among those warning that extending the limit for embryo research could risk undermining public trust in scientists and regulators. [...]
In this debate, the ultimate dilemma has to do with the moral status that we attribute to embryos. Some people feel that any embryo, from the point of fertilisation, has the same right to protection as a newborn baby, and so cultivating it purely for research would be wrong. Others maintain that embryos are simply a ball of cells, and so don’t warrant any special rules. Somewhere in the middle lies the gradualist viewpoint whereby an embryo is seen as growing in moral value as it develops, eventually acquiring, at some point before birth, the status of a person.
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