Subcellular localization of transcripts in Drosophila photoreceptor neurons: chaoptic mutants have an aberrant distribution.

Subcellular localization of transcripts in Drosophila photoreceptor neurons: chaoptic mutants have an aberrant distribution.
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果蝇感光神经元转录物的亚细胞定位:混沌突变体具有异常分布。

DOI:
10.1101/gad.4.5.806
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发表时间:
1990
影响因子:
10.5
通讯作者:
Benzer,S
Benzer,S
中科院分区:
生物学1区
文献类型:
--
作者:
Pollock,JA;Ellisman,MH;Benzer,S

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果蝇视网膜中的感光神经元长(100μ)且窄,为研究转录物和蛋白质的细胞内分布提供了系统。混沌基因仅在感光神经元中表达,该基因的突变导致细胞生成正常弹状体膜的发育能力降低。突变蛋白在发育中和成年感光神经元中都表现出改变的分布。此外,突变体中的转录物分布发生了改变,随着距细胞核的距离而减少,而不是在整个细胞体中正常的均匀分布。转录物浓度的不足与细胞横纹小球形成的发育缺陷的严重程度相关。相反,视蛋白转录物的分布不受混沌突变的影响。为了在超微结构水平观察 RNA 定位,开发了高分辨率电子显微镜原位杂交方案。结果表明,正常的混沌转录本存在于粗面内质网上,这可能是特定转录本分布的载体。
Photoreceptor neurons in the Drosophila retina are long (100 mu) and narrow, providing a system for the study of the intracellular distribution of transcripts and proteins. The chaoptic gene is expressed exclusively in photoreceptor neurons, and mutations of the gene result in reduced developmental competence of cells to generate normal rhabdomeric membranes. The mutant protein exhibited altered distribution both in developing and adult photoreceptor neurons. Furthermore, the transcript distribution in mutants was altered, decreasing with distance from the nucleus, instead of the normal uniform distribution throughout the cell soma. The deficit of transcript concentration correlated with the severity of developmental defect in rhabdomere formation along the cell. In contrast, the distribution of the opsin transcript was not affected by the chaoptic mutation. To observe RNA localization at the ultrastructural level, a high-resolution, electron microscopic in situ hybridization protocol was developed. The results indicate that the normal chaoptic transcript is present on the rough endoplasmic reticulum, which may be a vehicle for specific transcript distribution.
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