26 live chicks hatched from the artificial egg

US-based biotechnology company Colossal Biosciences hatched 26 live chicks with its artificial eggshell system. The study was carried out by transferring the biological content of a fertilized chicken egg to an artificial shell and incubation environment. The artificial egg system opens a new door for bird embryos. Colossal Biosciences announced that 26 healthy chicks were hatched with the artificial egg shell system developed for the development of bird embryos.

No synthetic egg ingredient produced from scratch was used in the experiment. The content of fertilized real chicken eggs was removed from the biological shell at the early development stage and transferred to the artificial shell system. Therefore, the center of the study is not artificial embryo or artificial yolk-white production, but a new incubation system that takes over the duties of the natural egg shell. The natural egg shell not only protects the embryo from external influences, it also regulates oxygen entry, carbon dioxide exit, moisture balance and mechanical environment.

Colossal’s system performs these functions with a cage-shaped outer body produced by 3D printing and a silicon-based semi-permeable membrane. According to the system announced by the company, the artificial shell allows the embryo to develop under normal atmospheric conditions. This point is the most striking technical aspect of the study. Because as bird embryos grow, their need for oxygen increases, and in previous studies conducted without shells or in artificial environments, this problem was often solved with additional oxygen support.

In Colossal’s announcement, it is highlighted that the system operates under normal atmospheric conditions containing 21 percent oxygen and does not require additional oxygen support. The silicon-based membrane used in the artificial shell helps maintain moisture and prevent external pollutants while allowing gas passage. The rigid cage structure provides the physical support necessary for the development of the embryo.

The system is also designed to fit inside standard commercial incubators. This shows that the method has been brought to a form that can be used not only with special mechanisms in the laboratory environment, but also with the existing incubation infrastructure. In Colossal’s study, fertilized eggs were selected in the early period after ovulation. The contents of the eggs containing suitable embryos were transferred to the artificial shell and the development was followed in this environment.

Since the natural shell was eliminated, the calcium issue was also addressed. Normally, the chick embryo benefits from the calcium in the egg shell during skeletal development. To compensate for this deficiency in the artificial system, calcium supplementation was made to the medium. Another important aspect of the system is the traceability of the embryo. The development process in the natural egg shell is monitored from the outside in a limited way.

The structure used in the artificial shell allows researchers to observe the development of the embryo more directly. This feature provides a critical advantage in terms of following the development process step by step, especially in genetically modified bird embryos. Colossal Biosciences does not position this technology only as a chicken embryo study. The company considers the system together with its studies on extinct bird species.

These species include the dodo and the South Island giant moa. Moa was a flightless bird species that became extinct about 600 years ago and could reach very large sizes. The egg of this species was much larger than a modern chicken egg, and today there is no living surrogate bird species that can carry and lay an egg of this size. This point makes the artificial egg system important in de-extinction studies. For extinct large bird species, simply editing genetic material is not enough.

The physical environment in which the resulting embryo will develop must also be provided. While natural eggs and existing incubation processes can be used in small species such as chickens, the problem of egg size and carrier species poses a major obstacle in giant birds such as moa. Colossal’s artificial shell system stands out as the engineering answer to this problem. However, the study does not mean that the moa or the dodo are brought back.

The artificial shell system only concerns one part of this process. For an extinct bird species, the genome information must first be extracted from ancient DNA, compared with living related species, the necessary genetic arrangements must be determined, and these arrangements must be transferred to the appropriate reproductive cells. The embryo that emerges later must develop healthily, hatch and survive for the long term.

Therefore, although Colossal’s announcement is an important threshold from a scientific perspective, it should not be interpreted as extinct birds returning. The results obtained by the company show that chicken embryos can develop and turn into live chicks in the artificial shell environment. This result opens a new field in terms of bird embryology, genetic editing research, conservation biology and artificial incubation systems to be developed for large egg species.

The actual data that will determine the scientific weight of the study is still limited. Colossal announced that 26 live chicks were hatched, but detailed data on how many attempts were made in total, what the success rate was, at what stages embryo losses occurred, and the long-term health status of the chicks were not shared in a public peer-reviewed article. Therefore, more data is needed for the effectiveness, repeatability and applicability of the technology to different bird species.

The artificial eggshell system also attracts attention on the agricultural and biotechnology side. A transparent and controlled developmental environment can facilitate monitoring without disrupting the early development of the embryo. It may be possible to follow genetic diseases, developmental anomalies and organ formation processes more clearly. The use of similar systems may be on the agenda for embryo rescue, sensitive incubation support and species conservation projects in endangered bird species.