60秒科学:Genetic Protection against Sleep Deprivation（在线收听）

Genetic Protection against Sleep Deprivation
A study in The Journal of Neuroscience finds that people with a particular version of a gene called Period 3 are better able to handle sleep deprivation because more of their brains get involved in counteracting the lack of zzz's. Cynthia Graber reports

[The following is an exact transcript of this podcast.]

Numerous studies have shown that lack of sleep hurts—it can lead to weight gain, diseases, and of course weakened cognitive functioning. But a bad night’s sleep doesn’t hurt everyone equally. Unlike me, some people can think clearly no matter what. A study published June 24th in The Journal of Neuroscience helps explain why.

Scientists looked for a genetic marker called Period 3 known to predict the effects of sleep deprivation. People with short versions of the gene do okay when they lose sleep. But the longer gene leads to suffering with lack of sleep.

Researchers tested attention and cognition before and after both good and bad nights’ sleeps. Those with the long Period 3 had poor function in the part of the brain that would usually spring to life. Even after a decent night, the long-gene people had reduced brain activity towards the end of the day. But folks with the short gene did better, and their brains even pulled in extra assistance from surrounding brain areas. I can guess which variation of the gene I have—which means not only should I get a good’s night sleep, I should probably write my scripts in the morning.

—Cynthia Graber