No, Scott Kelly's Genes Were Not Changed

Astronaut’s DNA no longer matches that of his identical twin, NASA finds, CNN
“Spending a year in space not only changes your outlook, it transforms your genes. Preliminary results from NASA’s Twins Study reveal that 7% of astronaut Scott Kelly’s genes did not return to normal after his return to Earth two years ago. The study looks at what happened to Kelly before, during and after he spent one year aboard the International Space Station through an extensive comparison with his identical twin, Mark, who remained on Earth. NASA has learned that the formerly identical twins are no longer genetically the same.”
Keith’s 14 March note: NO NO NO NO. The Kelly brothers are exactly the same genetically as they were the day they were born. No genes were “transformed”. Their genes are the same as they were the day they were conceived. What changed during space travel was how some genes were expressed. Some genes were shut off. Some genes were activated, Some genes were expressed at different levels. I wish that science writers would take the time to talk to people who actually understand the topic. There are dozens of articles like this circulating right now that get the fundamental aspect of this research wrong. Also, FWIW, NASA needs to spend more time explaining what it is they are trying to say. As an actual space biologist I find all of this rather frustrating.