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PostPosted: Feb 06, 2017 3:07 pm 
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Preliminary results from NASA’s unprecedented twin study — a detailed probe of the genetic differences between astronaut Scott Kelly, who spent nearly a consecutive year in space, and his identical twin Mark. Measurements taken before, during and after Scott Kelly’s mission reveal changes in gene expression, DNA methylation and other biological markers that are likely to be attributable to his time in orbit.

Studies of the twins' telomeres, the caps on the ends of their chromosomes, showed that during spaceflight Scott's telomeres grew to be longer than his brother's. “That is exactly the opposite of what we thought,” says Susan Bailey, a radiation biologist at Colorado State University in Fort Collins. A second lab has studied the same samples and confirmed this puzzling increase in telomere length, she says.

Can this be a case of radiation hormesis?


http://www.nature.com/news/astronaut-twin-study-hints-at-stress-of-space-travel-1.21380


Last edited by Bowspirit on Feb 09, 2017 5:39 am, edited 1 time in total.

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PostPosted: Feb 09, 2017 2:08 am 
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Did the SpaceTwin's "grow to be longer" or did the GroundTwin have more cell divisions and thus have more of them removed?

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PostPosted: Feb 09, 2017 2:11 am 
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Oh yes, and what is radiation hysteresis? Did you mean hormesis?

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PostPosted: Feb 09, 2017 5:39 am 
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KitemanSA wrote:
Oh yes, and what is radiation hysteresis? Did you mean hormesis?

Ops! I meant hormesis. Corrected, thanks.


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