Andrew Joseph
STATnews.com
Originally posted 26 May 2021
An influential scientific panel cracked open the door on Wednesday to growing human embryos in the lab for longer periods of time than currently allowed, a step that could enable the plumbing of developmental mysteries but that also raises thorny questions about whether research that can be pursued should be.
For decades, scientists around the world have followed the “14-day rule,” which stipulates that they should let human embryos develop in the lab for only up to two weeks after fertilization. The rule — which some countries (though not the United States) have codified into law — was meant to allow researchers to conduct inquiries into the early days of embryonic development, but not without limits. And for years, researchers didn’t push that boundary, not just for legal and ethical reasons, but for technical ones as well: They couldn’t keep the embryos growing in lab dishes that long.
More recently, however, scientists have refined their cell-culture techniques, finding ways to sustain embryos up to that deadline. Those advances — along with other leaps in the world of stem cell research, with scientists now transmogrifying cells into blobs that resemble early embryos or injecting human cells into animals — have complicated ethical debates about how far biomedical research should go in its quest for knowledge and potential treatments.
Now, in the latest updates to its guidelines, the International Society for Stem Cell Research has revised its view on studies that would take human embryos beyond 14 days, moving such experiments from the “absolutely not” category to a “maybe” — but only if lots of conditions are first met.
“We’ve relaxed the guidelines in that respect, we haven’t abandoned them,” developmental biologist Robin Lovell-Badge of the Francis Crick Institute, who chaired the ISSCR’s guidelines task force, said at a press briefing.
