Characterization of Sleep Mutants of Drososphila

描述(申请人提供)：睡眠存在于所有研究过睡眠的物种中，但其功能尚不清楚。充足的睡眠构成了基本的生理需要。例如，减少正常睡眠者的睡眠时间会影响表现、警觉性、记忆力和健康。像所有复杂的行为一样，睡眠既是环境调节的，也是基因决定的。然而，负责的基因还没有被发现。为了识别它们，我们启动了对果蝇黑腹果蝇短睡眠者的基因筛查。在果蝇中进行突变筛选有助于解开跨物种高度保守的细胞机制，例如那些控制发育、衰老、应激记忆和昼夜节律的机制。在过去的几年里，我们的实验室和其他实验室已经表明，飞行睡眠与哺乳动物睡眠有许多关键特征。与哺乳动物一样，果蝇的睡眠以唤醒阈值增加和脑电活动变化为特征。苍蝇的睡眠不受生物钟的调节，受刺激剂和催眠药的调节，并受年龄的影响。此外，苍蝇睡眠与大脑基因表达的变化有关，类似于在哺乳动物中观察到的变化。在过去的3年里，我们已经筛选了大约8000个突变株系，其中大部分携带单基因突变。我们发现，睡眠的数量和调节是高度保守的：几乎所有的苍蝇都在400到800分钟/24小时之间睡觉，并且在睡眠不足后表现出更长的睡眠持续时间和连续性。我们还确定了几条短卧铺线路，其中三条特别有趣。尽管睡眠时间减少(230分钟/天)，但这些线条显示出正常的白天表现和警觉性。当睡眠被剥夺时，它们会恢复大部分失去的睡眠，这表明这在生物学上是重要的。短睡眠突变是由于基因组中插入了一个P元素，它的动员使它们恢复到正常睡眠，这表明是单基因效应。我们建议从基因、分子和行为的角度来描述这三个品系。我们将操纵与短睡眠表型有关的基因的表达，研究由这些基因控制的分子通路，并表征它们对表现、记忆、昼夜节律和寿命的影响。这项研究将有助于确定调节睡眠需求的分子机制，并为其功能提供新的线索。

DESCRIPTION (provided by applicant): Sleep is present in all species where it has been studied, but its functions remain unknown. A sufficient amount of sleep constitutes a fundamental biological need. For example, curtailing the amount of sleep in normal sleepers affects performance, vigilance, memory and health. Like all complex behaviors, sleep is both environmentally modulated and genetically determined. However, the responsible genes have not been discovered. To identify them, we have initiated a genetic screening for short sleepers in the fruit fly Drosophila melanogaster. Mutagenesis screening in Drosophila has helped unraveling cellular mechanisms that are highly conserved across species, e.g. those controlling development, aging, stress memory, and circadian rhythms. Over the past few years, our laboratory and others have shown that fly sleep shares many key features with mammalian sleep. As in mammals, sleep in Drosophila is characterized by increased arousal thresholds and by changes in brain electrical activity. Fly sleep is regulated independent of the circadian clock, is modulated by stimulants and hypnotics, and is affected by age. Also, fly sleep is associated with changes in brain gene expression similar to those observed in mammals. Over the past 3 years, we have screened approximately 8000 mutant lines, most of which carry single-gene mutations. We found that the amount and regulation of sleep are highly conserved: almost all flies sleep between 400 and 800 min/24 hours and show increased sleep duration and continuity after sleep deprivation. We have also identified several short sleeper lines, three of which are particularly interesting. Despite the reduced amount of sleep (<230 min/day), these lines show normal day-time performance and vigilance. When sleep deprived, they recover most of the sleep lost, suggesting that it is biologically important. The short sleep mutation is due to the genomic insertion of a P element whose mobilization reverts them to normal sleep, suggesting a single gene effect. We propose to characterize these three lines genetically, molecularly, and behaviorally. We will manipulate the expression of the genes responsible for the short sleep phenotype, investigate the molecular pathways controlled by these genes, and characterize their impact on performance, memory, circadian rhythms and life span. This research will help to identify the molecular mechanisms regulating the need for sleep and provide novel clues to its functions.