Redefining the Human Embryo: Keeping Pace with Technological Progress

Scientists propose a new definition for the human embryo that focuses on its potential to develop into a fetus, rather than how it was formed. The proposal comes in response to the rapid advancements in synthetic embryology, where scientists are able to create embryo-like structures in the lab. The new definition suggests that embryo models could be considered embryos if they have the potential to survive up to eight weeks into a pregnancy. The lack of legal clarity around embryos and embryo models raises concerns about funding, public backlash, and potential legal consequences for scientists. The proposal also includes a developmental Turing test to determine if an embryo model has the potential to become a living person. The authors hope to raise awareness and initiate discussions among policymakers, scientific societies, and ethics committees.