Has the gene really changed since American astronauts went into space for a year?

The National Aeronautics and Space Administration (NASA) recently announced that the genetic difference between former American astronaut scott kelly (scott kelly) and his twin brother mark kelly (mark kelly) is 7%, and the DNA of a pair of twins does not match, which means that scott kelly's one-year stay in the International Space Station permanently changed his genes (or can be called genetic mutation).

Before, during and after Scott's one-year mission to the International Space Station, NASA recorded and studied any information on his body and compared it with that of his twin brother to see if it had changed. After about two years of research, NASA has proved that their genes are 7% different.

Although scientists announced the results of Scott's genetic changes last year, it was not clear at that time how much had changed. This time, scientists not only discovered detailed genetic changes, but also basically determined the main reason for this phenomenon.

Researchers have shown that in space flight, people's bodies are in a state of "hypoxia stress" for a long time, so they naturally think that they are not in an oxygen environment, so they will always be under pressure, which will increase the occurrence of many inflammations in the body and various nutrients in the body. It will also change. In addition to releasing genetic changes, previous studies have also found that Scott's chromosome ends have increased a lot in space, and his immune function is very active, and collagen and blood clots in his body have changed. But these changes usually return to normal within a period of time after returning to earth, unlike genes that will always remain in the changed state.

Although scientists discovered that Scott's genes had changed when he first returned to Earth, at that time, researchers thought that this was only caused by the mental stress naturally generated by human beings in space, and he would return to normal after a while (just like the end of his chromosome, which returned to normal length after two days). Who knows that the current findings prove that this genetic change will be permanent.