Human Cell Atlas - development atlas extension

A single human embryo at six to seven weeks old—smaller than a pea—will be mapped cell by cell to create a three-dimensional digital atlas of early human development. This project fills a critical gap: we know how organs form in isolation, but not how they coordinate across the whole embryo during late organogenesis. Current atlases lack the molecular resolution needed to trace how cells decide their fates, migrate, and build tissues in concert. Without this blueprint, understanding developmental disorders—such as congenital heart defects or neural tube malformations—remains piecemeal. If successful, the atlas will provide a high-resolution molecular map of anatomical landmarks during human development. This could transform diagnosis of childhood disorders by linking genetic variants to specific cells and stages. It will also harmonise developmental knowledge across species, improving the relevance of animal models. For regenerative medicine and tissue engineering, knowing exactly how human tissues assemble in the embryo could guide efforts to rebuild organs from stem cells. The work is fundamental science—curiosity-driven, not applied. But similar foundational resources, like the first human genome map, later enabled personalised medicine and prenatal genetic testing. This atlas may do the same for developmental biology.