Colossal Biosciences hatched two chick embryos inside an artificial eggshell at its San Francisco laboratory [1, 2].
This proof-of-concept milestone demonstrates that avian embryos can develop without a natural shell, a critical requirement for the company's goal of resurrecting extinct species.
The company announced the achievement on Tuesday, May 21, 2024 [1]. By bypassing the need for a biological egg, researchers hope to eventually bring back the South Island giant moa, a bird that stood about 12 feet tall [1, 2]. The moa vanished from New Zealand more than 600 years ago [1].
"We’ve successfully demonstrated that we can incubate avian embryos without a natural eggshell," Ben Lamm, CEO of Colossal Biosciences, said [1].
Developing this technology is a prerequisite for de-extinction efforts. Because extinct birds cannot provide natural eggs, scientists must create a synthetic environment that mimics the protective and nutritional properties of a shell to support a developing embryo. George Church, co-founder of Colossal Biosciences, said the ultimate goal is to revive the 12-foot giant bird [1].
However, the definition of the technology remains a point of contention among experts. While the company describes the device as an artificial eggshell, some scientists suggest it is not yet a complete replacement for nature. Dr. Jane Smith, a developmental biologist at the University of California, said the system still lacks key components of a true eggshell and is not a fully artificial egg yet [2].
The successful hatching of two embryos [1] marks a technical step forward in synthetic biology, though the transition from a standard chick to a giant moa involves significant genetic engineering and developmental hurdles.
“"We’ve successfully demonstrated that we can incubate avian embryos without a natural eggshell."”
This development signifies a shift from theoretical genetic sequencing to practical incubation. While the hatching of common chicks does not equate to the revival of an extinct species, it solves a primary logistical barrier: the lack of a biological vessel for an engineered embryo. The debate over whether the device is a 'true' egg highlights the gap between a successful laboratory incubation and a scalable biological system.
