Scientists create embryo-like research model from human stem cells – WHTC News

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By Kate Kelland

LONDON (Reuters) – Scientists have used human embryonic stem cells to create an embryo-like research model to help them study some of the earliest stages of human development.

The model overcomes some of the ethical restrictions on using human embryos for research and will allow scientists to study a period of human development known as the “black box” period, which they say has never been directly observed before.

“Our model produces part of the blueprint of a human,” said Alfonso Martinez-Arias, a professor at Britain’s Cambridge University who co-led the project.

“It’s exciting to witness the developmental processes that until now have been hidden from view – and from study.”

The hope, he said, is that understanding these processes could reveal the causes of human birth defects and diseases, and lead to the development of tests for them in pregnant women.

The blueprint of an organism arises through a process known as “gastrulation”, which in humans begins around two weeks into development. Gastrulation is referred to as the ‘black box’ period of human development, because legal restrictions prevent the culture of human embryos in the lab beyond day 14.

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