RNA-interference knockdown of Drosophila pigment dispersing factor in neuronal subsets: the anatomical basis of a neuropeptide's circadian functions.

RNA-interference knockdown of Drosophila pigment dispersing factor in neuronal subsets: the anatomical basis of a neuropeptide's circadian functions.
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果蝇色素分散因子在神经元子集中的RNA截断:神经肽昼夜节律功能的解剖基础。

DOI:
10.1371/journal.pone.0008298
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发表时间:
2009-12-14
期刊:
影响因子:
3.7
通讯作者:
Taghert PH
Taghert PH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shafer OT;Taghert PH

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在动物中,神经肽信号传导是昼夜节律的重要组成部分。果蝇昼夜节律的多个方面都需要神经肽色素分散因子(PDF)。在这里,我们通过针对果蝇特定类别神经元的 PDF RNA 干扰来研究 PDF 各种昼夜节律功能的解剖学基础。我们证明 PDF 是中脑腹外侧神经元 (vLN) 所必需的,而不是腹部神经节中正常活动节律所必需的。大型或小型 vLN 中 PDF 的差异敲低表明来自小型 vLN 的 PDF 可能负责维持自由运行的活动节律,而大型 vLN 中的正常行为不需要 PDF。 PDF 在设置自由运行活动节律的周期和光暗周期下夜间活动的适当时间方面的作用源自 vLN 的两种亚型,因为任一类 vLN 中的 PDF 足以满足这些方面的行为。这些结果揭示了 PDF 的各种昼夜节律功能的神经解剖学基础,并完善了我们对果蝇时钟神经元回路的理解。
In animals, neuropeptide signaling is an important component of circadian timekeeping. The neuropeptide pigment dispersing factor (PDF) is required for several aspects of circadian activity rhythms in Drosophila. Here we investigate the anatomical basis for PDF's various circadian functions by targeted PDF RNA-interference in specific classes of Drosophila neuron. We demonstrate that PDF is required in the ventro-lateral neurons (vLNs) of the central brain and not in the abdominal ganglion for normal activity rhythms. Differential knockdown of PDF in the large or small vLNs indicates that PDF from the small vLNs is likely responsible for the maintenance of free-running activity rhythms and that PDF is not required in the large vLNs for normal behavior. PDF's role in setting the period of free-running activity rhythms and the proper timing of evening activity under light:dark cycles emanates from both subtypes of vLN, since PDF in either class of vLN was sufficient for these aspects of behavior. These results reveal the neuroanatomical basis PDF's various circadian functions and refine our understanding of the clock neuron circuitry of Drosophila.
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