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A mouse starts as one fertilized egg, and its organs take shape through a branching sequence of cell divisions. In October 2026, two independent teams reported in Science and Cell that they could record those divisions inside developing mouse embryos using prime editing, a gene-editing method, and then reconstruct which cells descend from which. What they produced are lineage maps: family trees of cells. They are not continuous video of development, and they do not yet give a complete count of every cell in the embryo.
Why tracing a mouse embryo is so hard
Mouse embryos develop inside the mother, where no microscope can follow individual cells from start to finish. Nature’s 2026 report on the two studies notes that mammalian development is hidden and involves billions of cells whose fates are shaped by signals from outside the cell. That combination is what makes lineage tracing difficult: the cells cannot be watched, and the cells that matter are too numerous to label one by one.
A useful contrast is the nematode Caenorhabditis elegans. It is transparent, and it develops through an invariant pattern of divisions that ends in precisely 959 somatic cells. Nature’s account gives that figure as drawn from the historic cell-lineage work on the worm, not as a new measurement. The contrast does not mean mouse development is random. It means the pattern cannot be read simply by looking at the embryo, so investigators have to infer it from what the cells contain.
How lineage recording works
Every time a cell divides, its daughter cells inherit the DNA their parent carried, including any changes made to that DNA. If a tool writes marks into DNA at known genome sites as cells divide, cells that share a recent ancestor tend to share more of those marks. Sequencing the marks later lets analysts infer the branching order. The marks are read after the fact, which is why the output is a map of relationships rather than a film.
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Three limits follow directly from that design:
- The map shows which cells are related, not when each division happened in clock time.
- Only cells that carry readable marks can be placed in the tree. Cells without marks are invisible to the method.
- The reconstruction is only as complete as the marking and reading steps that produced it.
Why earlier recorders raised concerns
Jay Shendure’s team at the University of Washington developed an earlier CRISPR-based lineage recorder for zebrafish around 2016. That approach introduced genomic “barcodes” and used DNA sequencing to infer relationships among cells. Nature reports the concern that extensive editing can damage cells, which becomes a serious problem if many edits must be made during development.
The two 2026 teams used prime editing instead. Nature characterizes prime editing as more precise and less damaging than the earlier approach. That is the report’s description of these two studies, not a general verdict on every CRISPR system.
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The two studies
Nature’s Ewen Callaway reports that both groups published on October 8, 2026. The table sets out what the accessible account establishes for each study.
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|---|---|---|
| Journal | Science | Cell |
| Lead | Jay Shendure’s team, University of Washington, Seattle | Jonathan Weissman’s team |
| Citation given in Nature’s report | Yu et al., Science, DOI 10.1126/science.ael0508 (2026) | Colgan et al., Cell, DOI 10.1016/j.cell.2026.09.050 (2026) |
| Editing method | Prime editing | Prime editing |
| Marking approach | Sequential, indelible genetic marks at specific genome locations as cells divide | Not stated in the accessible report |
| Embryo examined | One mouse embryo from a fertilized egg, examined after two weeks, when major organ systems had formed | Embryos examined as organs formed; sample count not stated |
| Reported scope | Relationships reconstructed among 1.3 million edited cells, described as about 10% of the embryo’s total | Most cell divisions captured during organ formation |
| Cell count | 1.3 million edited cells (as reported by Nature) | Not stated in the accessible report |
Science study: DNA Typewriter
The Science team’s method, called DNA Typewriter, adds sequential marks at specific genome locations as cells divide. The fertilized egg was implanted into a mouse, and the embryo was examined after two weeks, a point at which major organ systems had formed. The team then read the edits and reconstructed relationships among 1.3 million edited cells.
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Cell study: Weissman’s team
The Cell study, led by Jonathan Weissman, captured most cell divisions in embryos as organs formed, according to Nature’s report. The accessible account does not give a matching cell count or enough protocol detail to compare the two methods’ performance directly. Read the two studies as complementary views of early mammalian development, not as a ranking.
What the 1.3 million figure does and does not cover
The 1.3 million number is a count of edited cells whose relationships were reconstructed, and Nature puts it at about 10% of the embryo’s total. The figure tells readers how much of the embryo the reconstruction reached. It does not say that every cell carried an edit, and it does not describe a complete lineage for the whole embryo.
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Scientist’s framing: why twins still differ
Jay Shendure, genome scientist at the University of Washington in Seattle and leader of the Science study, said: “Twins look the same, humans kind of look the same, yet even twins develop through very different sets of cell divisions.” Nature quotes him on the central point of the work. Similar bodies can arise from quite different histories of division, which is exactly what a lineage map is built to capture.
What is not yet established
This account relies on Nature’s report and the citation details it gives. Several specifics are not established by the accessible material and should be checked in the full Science and Cell papers and their supplements before being relied on:
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- Guide or editor designs used for prime editing
- Editing rates and error rates
- Sample counts for each study
- Tissue coverage beyond the cells reported
- Viability of the embryos after editing
- Any direct performance comparison between the two methods
Until those details are checked, the defensible claim is narrower than the headline: two teams used prime editing to record cell divisions in developing mouse embryos, and one of them reconstructed relationships among 1.3 million edited cells from a single two-week-old embryo.
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