The most intriguing early results suggest Scott Kelly experienced changes in the expression of thousands of genes; earlier this year, NASA reported that 7% of them—related to immune function, DNA repair, bone formation, and his body’s response to insufficient oxygen and abnormally high carbon dioxide levels in the blood—remained some 6 months after his return to Earth.
But those changes can’t be directly attributed to life in orbit, continues Sciencemag.org, they could simply be the result of being in an extremely stressful environment, says Christopher Mason, a geneticist at Weill Cornell Medicine in New York City, who led the gene expression study. So, he recruited Moniz and Benegas for an Earth-side “control” experiment. Although Everest is quite different from the ISS, low oxygen levels, freezing temperatures, and strong feelings of isolation make for intensely stressful conditions.
While Moniz and Benegas ascend, their twins—Kaylee Moniz and Damian Benegas—will stay at sea level and serve as their controls. The fact that both twin pairs are fraternal is “not ideal,” Mason says. “But you still can control 50% of their genetics, which is better than comparing completely different people with no relation.”
The Everest twin study, although not officially part of the NASA research, will use the same protocol. The climbers are collecting blood and microbiome samples—stool, saliva, and secretions from their eyes—at Everest Base Camp (5364 meters), both before and after acclimatization climbs, then again at Camp 3 and possibly higher. They will use supplemental oxygen on the last phase of their ascent, from Camp 3 to Everest’s 8850-meter summit. That means their final blood samples won’t be directly comparable to those taken at lower elevations, but it does increase their chances of getting to the top. It also means, Moniz jokes, that he’ll be able to keep all his brain cells for grad school.
Tatum Simonson, a geneticist at the University of California, San Diego, who studies genetic adaptations to high altitude, says the study will offer “unique insights” into how humans respond to environmental stresses. But she cautions that because different conditions are being tested—high altitude oxygen deprivation versus microgravity—the NASA and Everest studies remain distinct.
“They may be compared, but it is important to keep the differences in mind.” One area of possible comparison, she says, is changes to gene expression in pathways that respond to low oxygen, which appeared in Kelly after his year in space and are likely to appear in the two climbers.
Moniz and Benegas plan to push for the summit around the middle of May, when early forecasts show a likely drop in wind. If anyone can pull it off, it may be the two of them: Benegas has made it to the top of Everest 11 times, and Moniz, a National Geographic adventurer of the year, climbed several 8000-meter peaks before the age of 19. “I love working on projects like this when I’m on expeditions,” says Moniz, who studies biomedical engineering. “[It] offers me a chance to give something back, enrich my mind.”
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Today's "Planet Earth Report" –Two Mountaineers Recreate NASA’s Twin Study on Mount Everest