A stem cell-modeled mouse embryo at 96 hours (left); Mouse embryo cultured in vitro for 48 hours from the blastocyst stage (right). The red part is embryonic and the blue extra-embryonic.IMAGE: SARAH HARRISON AND GAELLE RECHER, ZERNICKA-GOETZ LAB, UNIVERSITY OF CAMBRIDGEScientists claim to have created an artificial mouse embryo using two types of stem cells—embryonic stem cells and extra-embryonic trophoblast stem cells, which normally form the placenta. They reported their results in Science yesterday (March 2).
“They are very similar to natural mouse embryos,” lead author Magdalena Zernicka-Goetz, a University of Cambridge biologist, told New Scientist. “We put the two types of stem cells together—which has never been done before—to allow them to speak to each other. We saw that the cells could self-organize themselves without our help.”
Zernicka-Goetz and her colleagues placed the mixture of embryonic and trophoblast stem cells onto a 3D scaffold that mimicked the extracellular matrix and aided in the nascent cells’ development. Four and a half days later, the group of cells on the scaffold had architecture and morphogenesis resembling a natural mouse embryo.
Scientists may be able to use similar methods to grow and study early human embryos. “This will allow us to study key ...
