For the first time in the world - Japan allows the development of human animal hybrid World of miscellaneous -

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After a long wait and an extended scientific controversy, Japan gave the green light to one of the researchers to begin developing a "human animal hybrid", in an unprecedented step so far in the world. The experiment is based on the implantation of animal embryos integrated with human cells, inside an animal and waiting until they are born. The research group, led by researcher Hiromitsu Nakawashi, wants the experiment first on mice and rabbits, according to a report in the journal Nature.

In the long term, scientists aim to develop a hybrid between humans and animals, with human organs growing up, which can then be used to help long-term patients to seek alternative organs.

Scientists in different countries of the world have long been trying to develop hybrids between humans and animals, but the laws have restricted the growth of these embryos for only a few weeks and not wait until the growth is complete. Until now, laws in Japan have permitted hybrids to grow for only 14 days.

Nakawashi plans to grow these hybrids for 15.5 days first, and monitor organ growth, to be asked in the next stage, to let him let these hybrids grow within pigs for 70 days. As for the human cells that scientists will use, this is what is known as "induced stem cells," which scientists can obtain from skin cells, for example, and develop them so that they can grow later in different organs and tissues.

The Japanese world aims to develop a pancreas using human stem cells with abundant capacity, having already conducted tests on stem cells from mice.

Nacaucci hopes to convince public opinion in the long term, while some scientists fear that these human cells can settle in animals in places other than those planned, such as the brain, which could change the nature of the entire system of the animal.

The Japanese biologist says he will prevent this by altering the cells genetically, so that they can develop only in a specific and predetermined form.

Another problem facing the Japanese world is that it has already planted human stem cells that are stimulated and abundant in sheep. After 28 days of cultivation, the human cells completely disappeared, as they were removed by the body because of the great difference between the normal cells and the cells of the animal's body. Nakahoshi responded to this point by saying that he wanted to solve the problem by learning about gene modification, but it could take decades.

The scientific obstacles facing Nakawashi do not stop at this point. Another difficulty is the different gestation periods between different organisms. The question here is: Does the duration of human or animal pregnancy apply to hybrid embryos with human stem cells within the body of an animal?

Because of all these obstacles, some scientists are leaning towards another research trend, which is to develop the animal's own organs so that it can then be used within the human body. What is certain now is that scientists' efforts are underway in different directions to solve the problem of long queues for patients who need to transport organs.

AFP /

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