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Manipulating embryogenesis and testing for potential: two real problems for the regulation of stem cell-based embryo models.

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Title: Manipulating embryogenesis and testing for potential: two real problems for the regulation of stem cell-based embryo models.
Authors: Lewis J; Centre for Biomedical Ethics, Yong Loo Lin School of Medicine, National University of Singapore, Singapore j.lewis@nus.edu.sg., Holm S; Centre for Social Ethics and Policy, Department of Law, University of Manchester, Manchester, UK.
Source: Journal of medical ethics [J Med Ethics] 2026 Jun 25; Vol. 52 (6), pp. 364-368. Date of Electronic Publication: 2026 Jun 25.
Publication Type: Journal Article
Language: English
Journal Info: Publisher: BMJ Publishing Group Country of Publication: England NLM ID: 7513619 Publication Model: Electronic Cited Medium: Internet ISSN: 1473-4257 (Electronic) Linking ISSN: 03066800 NLM ISO Abbreviation: J Med Ethics Subsets: MEDLINE
Imprint Name(s): Publication: <2004->: London : BMJ Publishing Group
Original Publication: London, Society for the Study of Medical Ethics.
MeSH Terms: Embryo Research*/ethics , Embryo Research*/legislation & jurisprudence , Stem Cell Research*/ethics , Stem Cell Research*/legislation & jurisprudence , Embryonic Development* , Embryonic Stem Cells*, Humans
Abstract: Stem cell-based human embryo models (SCBEMs), generated in vitro from stem cells, currently exist outside the scope of regulatory frameworks that govern in vitro embryo research in most jurisdictions. A widely discussed proposal suggests using a 'Turing test' framework, whereby regulatory oversight is triggered if an SCBEM is found to be 'equivalent' to a human embryo. In this paper, we argue that such a proposal faces two major complications. First, sophisticated laboratory techniques such as trophoblast replacement allow researchers to manipulate normal embryogenesis, obscuring whether a given SCBEM meets embryo-like regulatory thresholds. Second, attempts to assess SCBEMs' developmental potential-especially through non-human analogues-rest on tenuous epistemic assumptions that may not align with human-specific developmental trajectories. Given SCBEMs' potential manipulability and uncertain biological and potentiality benchmarks, we argue that reliance on equivalence-based frameworks alone is highly problematic. We conclude by urging a cautious, flexible approach that recognises both the scientific promise of SCBEMs and the normative need to prevent the circumvention of regulatory safeguards.
(© Author(s) (or their employer(s)) 2026. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ Group.)
Competing Interests: Competing interests: None declared.
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Contributed Indexing: Keywords: Cloning; Embryo Research; Embryos and Fetuses; Ethics- Research; Stem Cell Research
Entry Date(s): Date Created: 20250814 Date Completed: 20260626 Latest Revision: 20260813
Update Code: 20260813
PubMed Central ID: PMC13311940
DOI: 10.1136/jme-2025-110885
PMID: 40813060
Database: MEDLINE
Description
ISSN:1473-4257
DOI:10.1136/jme-2025-110885