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VOA English For Shadowing：Health & Science I
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Unit 5
Scientists Find Gene that Controls Insomnia
音声再生
＜For Shadowing＞
【ニュースの冒頭】を聞き、シャドーイング練習しましょう。
As the saying goes, early to bed, early to rise. But in the world of sleep researchers, that's a disorder as much as the syndrome experienced by people who stay up very late and sleep very late into the morning.
Humans operate on a 24-hour clock. This involuntary, internal mechanism, known as a circadian rhythm, determines how long we sleep and when.
Researchers, including neurologist Louis Ptacek of the Howard Hughes Medical Institute, discovered a defect in a gene known as Per2 that helps regulate the circadian rhythm.
This week in the journal Nature, Dr. Ptacek and colleagues at Howard Hughes Institute at the University of California in San Francisco report the discover y of another mutated gene in a completely different family, known as CK1delta. "If you think of it simply as, you know, gears in a c loc k. And the c loc k is tic king too fast, it could be, you know, a problem in one gear or as it is in Per2, in one large family, or could be a mutation in a different gear, in this case, CK1delta."
The researchers discovered the defective gene in a family of early risers.
When the gene was put into mice, the rodents exhibited early bird behavior. When the same gene was introduced into fruit flies, however, it shifted their circadian rhythm and turned them into larks.
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