Expression of the ligand-binding nicotinic acetylcholine receptor subunit D alpha 2 in the Drosophila central nervous system.

Expression of the ligand-binding nicotinic acetylcholine receptor subunit D alpha 2 in the Drosophila central nervous system.
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配体结合烟碱乙酰胆碱受体亚基 D α 2 在果蝇中枢神经系统中的表达。

DOI:
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发表时间:
1994
期刊:
Journal of Neurobiology
影响因子:
--
通讯作者:
E. Gundelfinger
E. Gundelfinger
中科院分区:
--
文献类型:
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作者:
Petra Jonas;B. Phannavong;Renate Schuster;Christiane Schröder;E. Gundelfinger

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D α 2基因编码黑腹果蝇烟碱乙酰胆碱受体(nAChRs)的配体结合亚基。我们分别通过原位杂交和免疫组织化学研究了D α 2转录物和蛋白质的分布,以及使用D α 2启动子片段与大肠杆菌lacZ基因融合来调节D α 2基因在体内的表达。仅在中枢神经系统中检测到来自D α 2基因的转录物和蛋白质。在晚期胚胎和成人D α 2样免疫反应是广泛的,但不均匀分布在突触神经元,这表明D α 2蛋白是一个亚单位的突触烟碱受体。它的分布类似于ALS和ARD蛋白(苍蝇的另外两种nAChR亚基)的分布。通过P元件介导的基因转移将五种不同的D α 2-lacZ融合基因构建体引入果蝇基因组中以鉴定D α 2启动子的功能元件。所有构建体产生与D α 2转录物和蛋白质的分布相容的基本lacZ表达模式。一个880 bp的上游片段窝藏的顺式元件的表达弱,但具体的基本D α 2模式。进一步上游的下一个350 bp显著增强β-半乳糖苷酶表达而不影响表达模式。在转录起始位点上游1.7和7.3 kb之间,定位了一个或多个在视叶切向细胞中D α 2表达所需的元件。
The D alpha 2 gene encodes a ligand-binding subunit of nicotinic acetylcholine receptors (nAChRs) from Drosophila melanogaster. We have studied the distribution of D alpha 2 transcripts and protein by in situ hybridization and immunohistochemistry, respectively, as well as the regulation of D alpha 2 gene expression in vivo using D alpha 2 promoter fragments fused to the Escherichia coli lacZ gene. Transcripts and protein from the D alpha 2 gene were detected exclusively in the central nervous system. Both in late embryos and adults D alpha 2-like immunoreactivity is widely but not uniformly distributed in the synaptic neuropil, suggesting that the D alpha 2 protein is a subunit of a synaptic nicotinic receptor. Its distribution resembles that of ALS and ARD proteins, two other nAChR subunits of the fly. Five different D alpha 2-lacZ fusion gene constructs were introduced into the Drosophila genome by P-element-mediated gene transfer to identity functional elements of the D alpha 2 promoter. All constructs produce a basic lacZ expression pattern that is compatible with the distribution of D alpha 2 transcripts and protein. A 880 bp upstream fragment harbors the cis elements for the expression of a weak but specific basic D alpha 2 pattern. The next 350 bp further upstream significantly enhance beta-galactosidase expression without influencing the pattern of expression. Between 1.7 and 7.3 kb upstream of the transcription start site one or more elements that are required for D alpha 2 expression in optic lobe tangential cells are located.
DOI: 10.1101/gad.3.5.676
发表时间: 1989-05-01
影响因子: 10.5
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