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Switch of rhodopsin expression in terminally differentiated Drosophila sensory neurons

机译:视果蝇终末分化果蝇感觉神经元中视紫红质表达的转换。

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摘要

Specificity of sensory neurons requires restricted expression of one sensory receptor gene and the exclusion of all others within a given cell. In the Drosophila retina, functional identity of photo-receptors depends on light-sensitive Rhodopsins (Rhs). The much simpler larval eye (Bolwig organ) is composed of about 12 photo-receptors, eight of which are green-sensitive (Rh6) and four blue-sensitive (Rh5) The larval eye becomes the adult extraretinal 'eyelet' composed of four green-sensitive (Rh6) photoreceptors. Here we show that, during metamorphosis, all Rh6 photoreceptors die, whereas the Rh5 photoreceptors switch fate by turning off Rh5 and then turning on Rh6 expression. This switch occurs without apparent changes in the programme of transcription factors that specify larval photoreceptor subtypes. We also show that the transcription factor Senseless (Sens) mediates the very different cellular behaviours of Rh5 and Rh6 photoreceptors. Sens is restricted to Rh5 photoreceptors and must be excluded from Rh6 photoreceptors to allow them to die at metamorphosis. Finally, we show that Ecdysone receptor (EcR) functions autonomously both for the death of larval Rh6 photoreceptors and for the sensory switch of Rh5 photoreceptors to express Rh6. This fate switch of functioning, terminally differentiated neurons provides a novel, unexpected example of hard-wired sensory plasticity.
机译:感觉神经元的特异性要求在一个给定的细胞内一个感觉受体基因的表达受到限制,而所有其他受体都被排除在外。在果蝇视网膜中,感光器的功能特性取决于光敏性视紫红质(Rhs)。简单得多的幼虫眼(Bolwig器官)由大约12个感光器组成,其中8个对绿色敏感(Rh6)和四个对蓝敏感(Rh5)。幼虫眼睛变成由四个绿色构成的成年视网膜外“小孔”敏感(Rh6)感光体。在这里,我们表明,在变态期间,所有Rh6感光细胞都死亡,而Rh5感光细胞通过关闭Rh5然后打开Rh6表达来切换命运。在指定幼虫感光受体亚型的转录因子程序中,在没有明显变化的情况下发生了这种转换。我们还表明,转录因子Senseless(Sens)介导Rh5和Rh6感光细胞的非常不同的细胞行为。 Sens仅限于Rh5感光体,必须从Rh6感光体中排除,才能使它们在变态时死亡。最后,我们表明,蜕皮激素受体(EcR)自主作用于幼虫Rh6感光细胞的死亡和Rh5感光细胞表达Rh6的感觉转换。功能性终末分化神经元的这种命运转换为硬连线的感觉可塑性提供了一个新的,出乎意料的例子。

著录项

  • 来源
    《Nature》 |2008年第7203期|p.533-537|共5页
  • 作者单位

    Center for Developmental Genetics, Department of Biology, New York University, 1090 Silver Center, 100 Washington Square East, New York, New York 10003-6688, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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