Astronaut Scott Kelly Jokes He No Longer Has Same DNA as Twin After Year in Space - NBC4 Washington
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Astronaut Scott Kelly Jokes He No Longer Has Same DNA as Twin After Year in Space

Kelly no longer shares the same DNA expression as his identical twin, Mark

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    Astronaut’s DNA Different From Twin’s After Year in Space

    Astronauts Scott Kelly and Mark Kelly are the first identical twin astronauts and allowed NASA to study the effects of prolonged space travel on the human body. Scott Kelly spent over a year in space and upon return no longer had the same DNA as Mark. (Published Thursday, March 15, 2018)

    After a yearlong mission in outer space, Scott Kelly came back a changed man — genetically, "Today" reported.

    A NASA study found that the 54-year-old no longer shares the exact same DNA as his identical twin, fellow astronaut Mark Kelly.

    According to NASA, 93 percent of Scott’s DNA returned to normal after landing, but seven percent did not. This can point to possible longer-term changes in genes related to his immune system, DNA repair, bone formation networks and more.

    “I no longer have to call @ShuttleCDRKelly my identical twin brother anymore,” Scott joked on Twitter. 

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    (Published Friday, March 15, 2019)

    Editor's note (March 16, 2018, 3 p.m. ET): NASA clarified that Scott Kelly's DNA did not fundamentally change, but that his gene expression did, noting that "this likely is within the range for humans under stress, such as mountain climbing or SCUBA diving."