NASA found that outer space environment could trigger change in human DNA
News24xx.com - Scott Kelly from United States Space Agency (NASA), said that humans who lives in space for one year can experience various genetic changes. Kelly said this was based on his personal experience which had lived on the Space Station (ISS) for 340 days. Kelly compared his genetic changes with his identical twin, Mark, who lives on Earth.
For a year, Kelly and Mark gave their blood, saliva and urine samples to number of NASA research teams. Every few weeks, frozen biological samples are transported to the ISS for the research. The result, NASA found that Kelly's telomere (The part at the end of DNA) grew longer. Telomere itself is a protective cover at the end of the chromosome and becomes shorter as humans age.
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Cnet reported, this finding surprised a team of scientists in NASA's human research program. So far NASA has used telomeres as way to measure human aging. When returning to Earth, the telomeres in Kelly's body begin to shrink and become shorter than before starting the mission to ISS.
Short telomeres are related to aging and the emergence number of diseases in Kelly's body. In addition to physical changes, NASA also notes that humans who live longer in space can experience mental changes. Kelly's carotid artery and retina are known to thicken even though they are considered normal during missions into space.
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