NANOG Gene Identified as Master Switch for Human
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- Kathy Niakan's team at the University of Cambridge used CRISPR base editing to identify NANOG as the master gene initiating human embryonic development, with a role distinct from its function in mice.
- NANOG functions species-specifically: disabling it blocked yolk sac progenitors in mouse eggs but prevented any cells from forming the embryo in human eggs donated by IVF patients.
- NANOG discovery could improve IVF success — Niakan says current shape-based embryo selection fails about half the time even when embryos look viable under the microscope.
- The researchers injected gene-editing machinery into eggs alongside sperm to edit at an earlier stage, but roughly half the resulting eggs were still mosaics — a rate Robin Lovell-Badge at the Francis Crick Institute called "too high" for clinical use.
- Dieter Egli at Columbia University published a pre-print last month on base editing of two-cell embryos, but his study focused on disease-mutation correction while Niakan's was the first to study gene function in human embryos.
- Mary Herbert at Monash University said there is "unanimous agreement" the technology is not ready for creating gene-edited children, with mosaicism remaining the major obstacle.
Why it matters: The discovery addresses a fundamental gap: NANOG's role couldn't be extrapolated from mice because it works differently in people. For the roughly half of IVF embryos that look viable but fail to implant, identifying molecular markers like NANOG could improve success rates — though clinical gene editing remains far off, with mosaicism still ~50% even with improved techniques.
